(function(global){
// *************************************************************
//   LiteGraph CLASS                                     *******
// *************************************************************

/* FYI: links are stored in graph.links with this structure per object
{
	id: number
	type: string,
	origin_id: number,
	origin_slot: number,
	target_id: number,
	target_slot: number,
	data: *
};
*/

/**
* The Global Scope. It contains all the registered node classes.
*
* @class LiteGraph
* @constructor
*/

var LiteGraph = global.LiteGraph = {

	NODE_TITLE_HEIGHT: 16,
	NODE_SLOT_HEIGHT: 15,
	NODE_WIDTH: 140,
	NODE_MIN_WIDTH: 50,
	NODE_COLLAPSED_RADIUS: 10,
	NODE_COLLAPSED_WIDTH: 80,
	CANVAS_GRID_SIZE: 10,
	NODE_TITLE_COLOR: "#222",
	NODE_DEFAULT_COLOR: "#999",
	NODE_DEFAULT_BGCOLOR: "#444",
	NODE_DEFAULT_BOXCOLOR: "#AEF",
	NODE_DEFAULT_SHAPE: "box",
	MAX_NUMBER_OF_NODES: 1000, //avoid infinite loops
	DEFAULT_POSITION: [100,100],//default node position
	node_images_path: "",

	//enums
	INPUT: 1,
	OUTPUT: 2,

	EVENT: -1, //for outputs
	ACTION: -1, //for inputs

	ALWAYS: 0,
	ON_EVENT: 1,
	NEVER: 2,
	ON_TRIGGER: 3,

	proxy: null, //used to redirect calls

	debug: false,
	throw_errors: true,
	allow_scripts: true,
	registered_node_types: {}, //nodetypes by string
	node_types_by_file_extension: {}, //used for droping files in the canvas
	Nodes: {}, //node types by classname

	/**
	* Register a node class so it can be listed when the user wants to create a new one
	* @method registerNodeType
	* @param {String} type name of the node and path
	* @param {Class} base_class class containing the structure of a node
	*/

	registerNodeType: function(type, base_class)
	{
		if(!base_class.prototype)
			throw("Cannot register a simple object, it must be a class with a prototype");
		base_class.type = type;

		if(LiteGraph.debug)
			console.log("Node registered: " + type);

		var categories = type.split("/");
		var classname = base_class.constructor.name;

		var pos = type.lastIndexOf("/");
		base_class.category = type.substr(0,pos);

		if(!base_class.title)
			base_class.title = classname;
		//info.name = name.substr(pos+1,name.length - pos);

		//extend class
		if(base_class.prototype) //is a class
			for(var i in LGraphNode.prototype)
				if(!base_class.prototype[i])
					base_class.prototype[i] = LGraphNode.prototype[i];

		this.registered_node_types[ type ] = base_class;
		if(base_class.constructor.name)
			this.Nodes[ classname ] = base_class;

		//warnings
		if(base_class.prototype.onPropertyChange)
			console.warn("LiteGraph node class " + type + " has onPropertyChange method, it must be called onPropertyChanged with d at the end");

		if( base_class.supported_extensions )
		{
			for(var i in base_class.supported_extensions )
				this.node_types_by_file_extension[ base_class.supported_extensions[i].toLowerCase() ] = base_class;
		}
	},

	/**
	* Adds this method to all nodetypes, existing and to be created
	* (You can add it to LGraphNode.prototype but then existing node types wont have it)
	* @method addNodeMethod
	* @param {Function} func
	*/
	addNodeMethod: function( name, func )
	{
		LGraphNode.prototype[name] = func;
		for(var i in this.registered_node_types)
		{
			var type = this.registered_node_types[i];
			if(type.prototype[name])
				type.prototype["_" + name] = type.prototype[name]; //keep old in case of replacing
			type.prototype[name] = func;
		}
	},

	/**
	* Create a node of a given type with a name. The node is not attached to any graph yet.
	* @method createNode
	* @param {String} type full name of the node class. p.e. "math/sin"
	* @param {String} name a name to distinguish from other nodes
	* @param {Object} options to set options
	*/

	createNode: function( type, title, options )
	{
		var base_class = this.registered_node_types[type];
		if (!base_class)
		{
			if(LiteGraph.debug)
				console.log("GraphNode type \"" + type + "\" not registered.");
			return null;
		}

		var prototype = base_class.prototype || base_class;

		title = title || base_class.title || type;

		var node = new base_class( name );
		node.type = type;

		if(!node.title) node.title = title;
		if(!node.properties) node.properties = {};
		if(!node.properties_info) node.properties_info = [];
		if(!node.flags) node.flags = {};
		if(!node.size) node.size = node.computeSize();
		if(!node.pos) node.pos = LiteGraph.DEFAULT_POSITION.concat();
		if(!node.mode) node.mode = LiteGraph.ALWAYS;

		//extra options
		if(options)
		{
			for(var i in options)
				node[i] = options[i];
		}

		return node;
	},

	/**
	* Returns a registered node type with a given name
	* @method getNodeType
	* @param {String} type full name of the node class. p.e. "math/sin"
	* @return {Class} the node class
	*/

	getNodeType: function(type)
	{
		return this.registered_node_types[type];
	},


	/**
	* Returns a list of node types matching one category
	* @method getNodeType
	* @param {String} category category name
	* @return {Array} array with all the node classes
	*/

	getNodeTypesInCategory: function(category)
	{
		var r = [];
		for(var i in this.registered_node_types)
			if(category == "")
			{
				if (this.registered_node_types[i].category == null)
					r.push(this.registered_node_types[i]);
			}
			else if (this.registered_node_types[i].category == category)
				r.push(this.registered_node_types[i]);

		return r;
	},

	/**
	* Returns a list with all the node type categories
	* @method getNodeTypesCategories
	* @return {Array} array with all the names of the categories
	*/

	getNodeTypesCategories: function()
	{
		var categories = {"":1};
		for(var i in this.registered_node_types)
			if(this.registered_node_types[i].category && !this.registered_node_types[i].skip_list)
				categories[ this.registered_node_types[i].category ] = 1;
		var result = [];
		for(var i in categories)
			result.push(i);
		return result;
	},

	//debug purposes: reloads all the js scripts that matches a wilcard
	reloadNodes: function (folder_wildcard)
	{
		var tmp = document.getElementsByTagName("script");
		//weird, this array changes by its own, so we use a copy
		var script_files = [];
		for(var i in tmp)
			script_files.push(tmp[i]);


		var docHeadObj = document.getElementsByTagName("head")[0];
		folder_wildcard = document.location.href + folder_wildcard;

		for(var i in script_files)
		{
			var src = script_files[i].src;
			if( !src || src.substr(0,folder_wildcard.length ) != folder_wildcard)
				continue;

			try
			{
				if(LiteGraph.debug)
					console.log("Reloading: " + src);
				var dynamicScript = document.createElement("script");
				dynamicScript.type = "text/javascript";
				dynamicScript.src = src;
				docHeadObj.appendChild(dynamicScript);
				docHeadObj.removeChild(script_files[i]);
			}
			catch (err)
			{
				if(LiteGraph.throw_errors)
					throw err;
				if(LiteGraph.debug)
					console.log("Error while reloading " + src);
			}
		}

		if(LiteGraph.debug)
			console.log("Nodes reloaded");
	},

	//separated just to improve if it doesnt work
	cloneObject: function(obj, target)
	{
		if(obj == null) return null;
		var r = JSON.parse( JSON.stringify( obj ) );
		if(!target) return r;

		for(var i in r)
			target[i] = r[i];
		return target;
	},

	isValidConnection: function( type_a, type_b )
	{
		if( !type_a ||  //generic output
			!type_b || //generic input
			type_a == type_b || //same type (is valid for triggers)
			(type_a !== LiteGraph.EVENT && type_b !== LiteGraph.EVENT && type_a.toLowerCase() == type_b.toLowerCase()) ) //same type
			return true;
		return false;
	}
};

if(typeof(performance) != "undefined")
  LiteGraph.getTime = function getTime() { return performance.now(); }
else
  LiteGraph.getTime = function getTime() { return Date.now(); }






//*********************************************************************************
// LGraph CLASS
//*********************************************************************************

/**
* LGraph is the class that contain a full graph. We instantiate one and add nodes to it, and then we can run the execution loop.
*
* @class LGraph
* @constructor
*/

global.LGraph = LiteGraph.LGraph = function LGraph()
{
	if (LiteGraph.debug)
		console.log("Graph created");
	this.list_of_graphcanvas = null;
	this.clear();
}

//default supported types
LGraph.supported_types = ["number","string","boolean"];

//used to know which types of connections support this graph (some graphs do not allow certain types)
LGraph.prototype.getSupportedTypes = function() { return this.supported_types || LGraph.supported_types; }

LGraph.STATUS_STOPPED = 1;
LGraph.STATUS_RUNNING = 2;

/**
* Removes all nodes from this graph
* @method clear
*/

LGraph.prototype.clear = function()
{
	this.stop();
	this.status = LGraph.STATUS_STOPPED;
	this.last_node_id = 0;

	//nodes
	this._nodes = [];
	this._nodes_by_id = {};
	this._nodes_in_order = null; //nodes that are executable sorted in execution order
	this._nodes_executable = null; //nodes that contain onExecute

	//links
	this.last_link_id = 0;
	this.links = {}; //container with all the links

	//iterations
	this.iteration = 0;

	this.config = {
	};

	//timing
	this.globaltime = 0;
	this.runningtime = 0;
	this.fixedtime =  0;
	this.fixedtime_lapse = 0.01;
	this.elapsed_time = 0.01;
	this.starttime = 0;

	this.catch_errors = true;

	//globals
	this.global_inputs = {};
	this.global_outputs = {};

	//this.graph = {};
	this.debug = true;

	this.change();

	this.sendActionToCanvas("clear");
}

/**
* Attach Canvas to this graph
* @method attachCanvas
* @param {GraphCanvas} graph_canvas
*/

LGraph.prototype.attachCanvas = function(graphcanvas)
{
	if(graphcanvas.constructor != LGraphCanvas)
		throw("attachCanvas expects a LGraphCanvas instance");
	if(graphcanvas.graph && graphcanvas.graph != this)
		graphcanvas.graph.detachCanvas( graphcanvas );

	graphcanvas.graph = this;
	if(!this.list_of_graphcanvas)
		this.list_of_graphcanvas = [];
	this.list_of_graphcanvas.push(graphcanvas);
}

/**
* Detach Canvas from this graph
* @method detachCanvas
* @param {GraphCanvas} graph_canvas
*/

LGraph.prototype.detachCanvas = function(graphcanvas)
{
	if(!this.list_of_graphcanvas)
		return;

	var pos = this.list_of_graphcanvas.indexOf( graphcanvas );
	if(pos == -1)
		return;
	graphcanvas.graph = null;
	this.list_of_graphcanvas.splice(pos,1);
}

/**
* Starts running this graph every interval milliseconds.
* @method start
* @param {number} interval amount of milliseconds between executions, default is 1
*/

LGraph.prototype.start = function(interval)
{
	if( this.status == LGraph.STATUS_RUNNING )
		return;
	this.status = LGraph.STATUS_RUNNING;

	if(this.onPlayEvent)
		this.onPlayEvent();

	this.sendEventToAllNodes("onStart");

	//launch
	this.starttime = LiteGraph.getTime();
	interval = interval || 1;
	var that = this;

	this.execution_timer_id = setInterval( function() {
		//execute
		that.runStep(1, !this.catch_errors );
	},interval);
}

/**
* Stops the execution loop of the graph
* @method stop execution
*/

LGraph.prototype.stop = function()
{
	if( this.status == LGraph.STATUS_STOPPED )
		return;

	this.status = LGraph.STATUS_STOPPED;

	if(this.onStopEvent)
		this.onStopEvent();

	if(this.execution_timer_id != null)
		clearInterval(this.execution_timer_id);
	this.execution_timer_id = null;

	this.sendEventToAllNodes("onStop");
}

/**
* Run N steps (cycles) of the graph
* @method runStep
* @param {number} num number of steps to run, default is 1
*/

LGraph.prototype.runStep = function( num, do_not_catch_errors )
{
	num = num || 1;

	var start = LiteGraph.getTime();
	this.globaltime = 0.001 * (start - this.starttime);

	var nodes = this._nodes_executable ? this._nodes_executable : this._nodes;
	if(!nodes)
		return;

	if( do_not_catch_errors )
	{
		//iterations
		for(var i = 0; i < num; i++)
		{
			for( var j = 0, l = nodes.length; j < l; ++j )
			{
				var node = nodes[j];
				if( node.mode == LiteGraph.ALWAYS && node.onExecute )
					node.onExecute();
			}

			this.fixedtime += this.fixedtime_lapse;
			if( this.onExecuteStep )
				this.onExecuteStep();
		}

		if( this.onAfterExecute )
			this.onAfterExecute();
	}
	else
	{
		try
		{
			//iterations
			for(var i = 0; i < num; i++)
			{
				for( var j = 0, l = nodes.length; j < l; ++j )
				{
					var node = nodes[j];
					if( node.mode == LiteGraph.ALWAYS && node.onExecute )
						node.onExecute();
				}

				this.fixedtime += this.fixedtime_lapse;
				if( this.onExecuteStep )
					this.onExecuteStep();
			}

			if( this.onAfterExecute )
				this.onAfterExecute();
			this.errors_in_execution = false;
		}
		catch (err)
		{
			this.errors_in_execution = true;
			if(LiteGraph.throw_errors)
				throw err;
			if(LiteGraph.debug)
				console.log("Error during execution: " + err);
			this.stop();
		}
	}

	var elapsed = LiteGraph.getTime() - start;
	if (elapsed == 0)
		elapsed = 1;
	this.elapsed_time = 0.001 * elapsed;
	this.globaltime += 0.001 * elapsed;
	this.iteration += 1;
}

/**
* Updates the graph execution order according to relevance of the nodes (nodes with only outputs have more relevance than
* nodes with only inputs.
* @method updateExecutionOrder
*/
LGraph.prototype.updateExecutionOrder = function()
{
	this._nodes_in_order = this.computeExecutionOrder( false );
	this._nodes_executable = [];
	for(var i = 0; i < this._nodes_in_order.length; ++i)
		if( this._nodes_in_order[i].onExecute )
			this._nodes_executable.push( this._nodes_in_order[i] );
}

//This is more internal, it computes the order and returns it
LGraph.prototype.computeExecutionOrder = function( only_onExecute )
{
	var L = [];
	var S = [];
	var M = {};
	var visited_links = {}; //to avoid repeating links
	var remaining_links = {}; //to a

	//search for the nodes without inputs (starting nodes)
	for (var i = 0, l = this._nodes.length; i < l; ++i)
	{
		var n = this._nodes[i];
		if( only_onExecute && !n.onExecute )
			continue;

		M[n.id] = n; //add to pending nodes

		var num = 0; //num of input connections
		if(n.inputs)
			for(var j = 0, l2 = n.inputs.length; j < l2; j++)
				if(n.inputs[j] && n.inputs[j].link != null)
					num += 1;

		if(num == 0) //is a starting node
			S.push(n);
		else //num of input links
			remaining_links[n.id] = num;
	}

	while(true)
	{
		if(S.length == 0)
			break;

		//get an starting node
		var n = S.shift();
		L.push(n); //add to ordered list
		delete M[n.id]; //remove from the pending nodes

		//for every output
		if(n.outputs)
			for(var i = 0; i < n.outputs.length; i++)
			{
				var output = n.outputs[i];
				//not connected
				if(output == null || output.links == null || output.links.length == 0)
					continue;

				//for every connection
				for(var j = 0; j < output.links.length; j++)
				{
					var link_id = output.links[j];
					var link = this.links[link_id];
					if(!link) continue;

					//already visited link (ignore it)
					if(visited_links[ link.id ])
						continue;

					var target_node = this.getNodeById( link.target_id );
					if(target_node == null)
					{
						visited_links[ link.id ] = true;
						continue;
					}

					visited_links[link.id] = true; //mark as visited
					remaining_links[target_node.id] -= 1; //reduce the number of links remaining
					if (remaining_links[target_node.id] == 0)
						S.push(target_node); //if no more links, then add to Starters array
				}
			}
	}

	//the remaining ones (loops)
	for(var i in M)
		L.push( M[i] );

	if( L.length != this._nodes.length && LiteGraph.debug )
		console.warn("something went wrong, nodes missing");

	//save order number in the node
	for(var i = 0; i < L.length; ++i)
		L[i].order = i;

	return L;
}


/**
* Returns the amount of time the graph has been running in milliseconds
* @method getTime
* @return {number} number of milliseconds the graph has been running
*/

LGraph.prototype.getTime = function()
{
	return this.globaltime;
}

/**
* Returns the amount of time accumulated using the fixedtime_lapse var. This is used in context where the time increments should be constant
* @method getFixedTime
* @return {number} number of milliseconds the graph has been running
*/

LGraph.prototype.getFixedTime = function()
{
	return this.fixedtime;
}

/**
* Returns the amount of time it took to compute the latest iteration. Take into account that this number could be not correct
* if the nodes are using graphical actions
* @method getElapsedTime
* @return {number} number of milliseconds it took the last cycle
*/

LGraph.prototype.getElapsedTime = function()
{
	return this.elapsed_time;
}

/**
* Sends an event to all the nodes, useful to trigger stuff
* @method sendEventToAllNodes
* @param {String} eventname the name of the event (function to be called)
* @param {Array} params parameters in array format
*/

LGraph.prototype.sendEventToAllNodes = function( eventname, params, mode )
{
	mode = mode || LiteGraph.ALWAYS;

	var nodes = this._nodes_in_order ? this._nodes_in_order : this._nodes;
	if(!nodes)
		return;

	for( var j = 0, l = nodes.length; j < l; ++j )
	{
		var node = nodes[j];
		if(node[eventname] && node.mode == mode )
		{
			if(params === undefined)
				node[eventname]();
			else if(params && params.constructor === Array)
				node[eventname].apply( node, params );
			else
				node[eventname](params);
		}
	}
}

LGraph.prototype.sendActionToCanvas = function(action, params)
{
	if(!this.list_of_graphcanvas)
		return;

	for(var i = 0; i < this.list_of_graphcanvas.length; ++i)
	{
		var c = this.list_of_graphcanvas[i];
		if( c[action] )
			c[action].apply(c, params);
	}
}

/**
* Adds a new node instasnce to this graph
* @method add
* @param {LGraphNode} node the instance of the node
*/

LGraph.prototype.add = function(node, skip_compute_order)
{
	if(!node || (node.id != -1 && this._nodes_by_id[node.id] != null))
		return; //already added

	if(this._nodes.length >= LiteGraph.MAX_NUMBER_OF_NODES)
		throw("LiteGraph: max number of nodes in a graph reached");

	//give him an id
	if(node.id == null || node.id == -1)
		node.id = ++this.last_node_id;
	else if (this.last_node_id < node.id)
		this.last_node_id = node.id;

	node.graph = this;

	this._nodes.push(node);
	this._nodes_by_id[node.id] = node;

	/*
	// rendering stuf...
	if(node.bgImageUrl)
		node.bgImage = node.loadImage(node.bgImageUrl);
	*/

	if(node.onAdded)
		node.onAdded( this );

	if(this.config.align_to_grid)
		node.alignToGrid();

	if(!skip_compute_order)
		this.updateExecutionOrder();

	if(this.onNodeAdded)
		this.onNodeAdded(node);


	this.setDirtyCanvas(true);

	this.change();

	return node; //to chain actions
}

/**
* Removes a node from the graph
* @method remove
* @param {LGraphNode} node the instance of the node
*/

LGraph.prototype.remove = function(node)
{
	if(this._nodes_by_id[node.id] == null)
		return; //not found

	if(node.ignore_remove)
		return; //cannot be removed

	//disconnect inputs
	if(node.inputs)
		for(var i = 0; i < node.inputs.length; i++)
		{
			var slot = node.inputs[i];
			if(slot.link != null)
				node.disconnectInput(i);
		}

	//disconnect outputs
	if(node.outputs)
		for(var i = 0; i < node.outputs.length; i++)
		{
			var slot = node.outputs[i];
			if(slot.links != null && slot.links.length)
				node.disconnectOutput(i);
		}

	//node.id = -1; //why?

	//callback
	if(node.onRemoved)
		node.onRemoved();

	node.graph = null;

	//remove from canvas render
	if(this.list_of_graphcanvas)
	{
		for(var i = 0; i < this.list_of_graphcanvas.length; ++i)
		{
			var canvas = this.list_of_graphcanvas[i];
			if(canvas.selected_nodes[node.id])
				delete canvas.selected_nodes[node.id];
			if(canvas.node_dragged == node)
				canvas.node_dragged = null;
		}
	}

	//remove from containers
	var pos = this._nodes.indexOf(node);
	if(pos != -1)
		this._nodes.splice(pos,1);
	delete this._nodes_by_id[node.id];

	if(this.onNodeRemoved)
		this.onNodeRemoved(node);

	this.setDirtyCanvas(true,true);

	this.change();

	this.updateExecutionOrder();
}

/**
* Returns a node by its id.
* @method getNodeById
* @param {Number} id
*/

LGraph.prototype.getNodeById = function( id )
{
	if( id == null )
		return null;
	return this._nodes_by_id[ id ];
}

/**
* Returns a list of nodes that matches a class
* @method findNodesByClass
* @param {Class} classObject the class itself (not an string)
* @return {Array} a list with all the nodes of this type
*/

LGraph.prototype.findNodesByClass = function(classObject)
{
	var r = [];
	for(var i = 0, l = this._nodes.length; i < l; ++i)
		if(this._nodes[i].constructor === classObject)
			r.push(this._nodes[i]);
	return r;
}

/**
* Returns a list of nodes that matches a type
* @method findNodesByType
* @param {String} type the name of the node type
* @return {Array} a list with all the nodes of this type
*/

LGraph.prototype.findNodesByType = function(type)
{
	var type = type.toLowerCase();
	var r = [];
	for(var i = 0, l = this._nodes.length; i < l; ++i)
		if(this._nodes[i].type.toLowerCase() == type )
			r.push(this._nodes[i]);
	return r;
}

/**
* Returns a list of nodes that matches a name
* @method findNodesByName
* @param {String} name the name of the node to search
* @return {Array} a list with all the nodes with this name
*/

LGraph.prototype.findNodesByTitle = function(title)
{
	var result = [];
	for(var i = 0, l = this._nodes.length; i < l; ++i)
		if(this._nodes[i].title == title)
			result.push(this._nodes[i]);
	return result;
}

/**
* Returns the top-most node in this position of the canvas
* @method getNodeOnPos
* @param {number} x the x coordinate in canvas space
* @param {number} y the y coordinate in canvas space
* @param {Array} nodes_list a list with all the nodes to search from, by default is all the nodes in the graph
* @return {Array} a list with all the nodes that intersect this coordinate
*/

LGraph.prototype.getNodeOnPos = function(x,y, nodes_list)
{
	nodes_list = nodes_list || this._nodes;
	for (var i = nodes_list.length - 1; i >= 0; i--)
	{
		var n = nodes_list[i];
		if(n.isPointInsideNode( x, y, 2 ))
			return n;
	}
	return null;
}

// ********** GLOBALS *****************

//Tell this graph has a global input of this type
LGraph.prototype.addGlobalInput = function(name, type, value)
{
	this.global_inputs[name] = { name: name, type: type, value: value };

	if(this.onGlobalInputAdded)
		this.onGlobalInputAdded(name, type);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
}

//assign a data to the global input
LGraph.prototype.setGlobalInputData = function(name, data)
{
	var input = this.global_inputs[name];
	if (!input)
		return;
	input.value = data;
}

//assign a data to the global input
LGraph.prototype.getGlobalInputData = function(name)
{
	var input = this.global_inputs[name];
	if (!input)
		return null;
	return input.value;
}

//rename the global input
LGraph.prototype.renameGlobalInput = function(old_name, name)
{
	if(name == old_name)
		return;

	if(!this.global_inputs[old_name])
		return false;

	if(this.global_inputs[name])
	{
		console.error("there is already one input with that name");
		return false;
	}

	this.global_inputs[name] = this.global_inputs[old_name];
	delete this.global_inputs[old_name];

	if(this.onGlobalInputRenamed)
		this.onGlobalInputRenamed(old_name, name);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
}

LGraph.prototype.changeGlobalInputType = function(name, type)
{
	if(!this.global_inputs[name])
		return false;

	if(this.global_inputs[name].type.toLowerCase() == type.toLowerCase() )
		return;

	this.global_inputs[name].type = type;
	if(this.onGlobalInputTypeChanged)
		this.onGlobalInputTypeChanged(name, type);
}

LGraph.prototype.removeGlobalInput = function(name)
{
	if(!this.global_inputs[name])
		return false;

	delete this.global_inputs[name];

	if(this.onGlobalInputRemoved)
		this.onGlobalInputRemoved(name);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
	return true;
}


LGraph.prototype.addGlobalOutput = function(name, type, value)
{
	this.global_outputs[name] = { name: name, type: type, value: value };

	if(this.onGlobalOutputAdded)
		this.onGlobalOutputAdded(name, type);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
}

//assign a data to the global output
LGraph.prototype.setGlobalOutputData = function(name, value)
{
	var output = this.global_outputs[ name ];
	if (!output)
		return;
	output.value = value;
}

//assign a data to the global input
LGraph.prototype.getGlobalOutputData = function(name)
{
	var output = this.global_outputs[name];
	if (!output)
		return null;
	return output.value;
}


//rename the global output
LGraph.prototype.renameGlobalOutput = function(old_name, name)
{
	if(!this.global_outputs[old_name])
		return false;

	if(this.global_outputs[name])
	{
		console.error("there is already one output with that name");
		return false;
	}

	this.global_outputs[name] = this.global_outputs[old_name];
	delete this.global_outputs[old_name];

	if(this.onGlobalOutputRenamed)
		this.onGlobalOutputRenamed(old_name, name);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
}

LGraph.prototype.changeGlobalOutputType = function(name, type)
{
	if(!this.global_outputs[name])
		return false;

	if(this.global_outputs[name].type.toLowerCase() == type.toLowerCase() )
		return;

	this.global_outputs[name].type = type;
	if(this.onGlobalOutputTypeChanged)
		this.onGlobalOutputTypeChanged(name, type);
}

LGraph.prototype.removeGlobalOutput = function(name)
{
	if(!this.global_outputs[name])
		return false;
	delete this.global_outputs[name];

	if(this.onGlobalOutputRemoved)
		this.onGlobalOutputRemoved(name);

	if(this.onGlobalsChange)
		this.onGlobalsChange();
	return true;
}


/**
* Assigns a value to all the nodes that matches this name. This is used to create global variables of the node that
* can be easily accesed from the outside of the graph
* @method setInputData
* @param {String} name the name of the node
* @param {*} value value to assign to this node
*/

LGraph.prototype.setInputData = function(name,value)
{
	var nodes = this.findNodesByName( name );
	for(var i = 0, l = nodes.length; i < l; ++i)
		nodes[i].setValue(value);
}

/**
* Returns the value of the first node with this name. This is used to access global variables of the graph from the outside
* @method setInputData
* @param {String} name the name of the node
* @return {*} value of the node
*/

LGraph.prototype.getOutputData = function(name)
{
	var n = this.findNodesByName(name);
	if(n.length)
		return m[0].getValue();
	return null;
}

//This feature is not finished yet, is to create graphs where nodes are not executed unless a trigger message is received

LGraph.prototype.triggerInput = function(name,value)
{
	var nodes = this.findNodesByName(name);
	for(var i = 0; i < nodes.length; ++i)
		nodes[i].onTrigger(value);
}

LGraph.prototype.setCallback = function(name,func)
{
	var nodes = this.findNodesByName(name);
	for(var i = 0; i < nodes.length; ++i)
		nodes[i].setTrigger(func);
}


LGraph.prototype.connectionChange = function( node )
{
	this.updateExecutionOrder();
	if( this.onConnectionChange )
		this.onConnectionChange( node );
	this.sendActionToCanvas("onConnectionChange");
}

/**
* returns if the graph is in live mode
* @method isLive
*/

LGraph.prototype.isLive = function()
{
	if(!this.list_of_graphcanvas)
		return false;

	for(var i = 0; i < this.list_of_graphcanvas.length; ++i)
	{
		var c = this.list_of_graphcanvas[i];
		if(c.live_mode)
			return true;
	}
	return false;
}

/* Called when something visually changed */
LGraph.prototype.change = function()
{
	if(LiteGraph.debug)
		console.log("Graph changed");

	this.sendActionToCanvas("setDirty",[true,true]);

	if(this.on_change)
		this.on_change(this);
}

LGraph.prototype.setDirtyCanvas = function(fg,bg)
{
	this.sendActionToCanvas("setDirty",[fg,bg]);
}

//save and recover app state ***************************************
/**
* Creates a Object containing all the info about this graph, it can be serialized
* @method serialize
* @return {Object} value of the node
*/
LGraph.prototype.serialize = function()
{
	var nodes_info = [];
	for(var i = 0, l = this._nodes.length; i < l; ++i)
		nodes_info.push( this._nodes[i].serialize() );

	//pack link info into a non-verbose format
	var links = [];
	for(var i in this.links) //links is an OBJECT
	{
		var link = this.links[i];
		links.push([ link.id, link.origin_id, link.origin_slot, link.target_id, link.target_slot, link.type ]);
	}

	var data = {
		iteration: this.iteration,
		frame: this.frame,
		last_node_id: this.last_node_id,
		last_link_id: this.last_link_id,
		links: links, //LiteGraph.cloneObject( this.links ),
		config: this.config,
		nodes: nodes_info
	};

	return data;
}


/**
* Configure a graph from a JSON string
* @method configure
* @param {String} str configure a graph from a JSON string
*/
LGraph.prototype.configure = function(data, keep_old)
{
	if(!keep_old)
		this.clear();

	var nodes = data.nodes;

	//decode links info (they are very verbose)
	if(data.links && data.links.constructor === Array)
	{
		var links = {};
		for(var i = 0; i < data.links.length; ++i)
		{
			var link = data.links[i];
			links[ link[0] ] = { id: link[0], origin_id: link[1], origin_slot: link[2], target_id: link[3], target_slot: link[4], type: link[5] };
		}
		data.links = links;
	}

	//copy all stored fields
	for (var i in data)
		this[i] = data[i];

	var error = false;

	//create nodes
	this._nodes = [];
	for(var i = 0, l = nodes.length; i < l; ++i)
	{
		var n_info = nodes[i]; //stored info
		var node = LiteGraph.createNode( n_info.type, n_info.title );
		if(!node)
		{
			if(LiteGraph.debug)
				console.log("Node not found: " + n_info.type);
			error = true;
			continue;
		}

		node.id = n_info.id; //id it or it will create a new id
		this.add(node, true); //add before configure, otherwise configure cannot create links
	}

	//configure nodes afterwards so they can reach each other
	for(var i = 0, l = nodes.length; i < l; ++i)
	{
		var n_info = nodes[i];
		var node = this.getNodeById( n_info.id );
		if(node)
			node.configure( n_info );
	}

	this.updateExecutionOrder();
	this.setDirtyCanvas(true,true);
	return error;
}

LGraph.prototype.load = function(url)
{
	var that = this;
	var req = new XMLHttpRequest();
	req.open('GET', url, true);
	req.send(null);
	req.onload = function (oEvent) {
		if(req.status !== 200)
		{
			console.error("Error loading graph:",req.status,req.response);
			return;
		}
		var data = JSON.parse( req.response );
		that.configure(data);
	}
	req.onerror = function(err)
	{
		console.error("Error loading graph:",err);
	}
}

LGraph.prototype.onNodeTrace = function(node, msg, color)
{
	//TODO
}

// *************************************************************
//   Node CLASS                                          *******
// *************************************************************

/*
	title: string
	pos: [x,y]
	size: [x,y]

	input|output: every connection
		+  { name:string, type:string, pos: [x,y]=Optional, direction: "input"|"output", links: Array });

	flags:
		+ skip_title_render
		+ clip_area
		+ unsafe_execution: not allowed for safe execution
		+ skip_repeated_outputs: when adding new outputs, it wont show if there is one already connected

	supported callbacks:
		+ onAdded: when added to graph
		+ onRemoved: when removed from graph
		+ onStart:	when the graph starts playing
		+ onStop:	when the graph stops playing
		+ onDrawForeground: render the inside widgets inside the node
		+ onDrawBackground: render the background area inside the node (only in edit mode)
		+ onMouseDown
		+ onMouseMove
		+ onMouseUp
		+ onMouseEnter
		+ onMouseLeave
		+ onExecute: execute the node
		+ onPropertyChanged: when a property is changed in the panel (return true to skip default behaviour)
		+ onGetInputs: returns an array of possible inputs
		+ onGetOutputs: returns an array of possible outputs
		+ onDblClick
		+ onSerialize
		+ onSelected
		+ onDeselected
		+ onDropItem : DOM item dropped over the node
		+ onDropFile : file dropped over the node
		+ onConnectInput : if returns false the incoming connection will be canceled
		+ onConnectionsChange : a connection changed (new one or removed) (LiteGraph.INPUT or LiteGraph.OUTPUT, slot, true if connected, link_info, input_info )
*/

/**
* Base Class for all the node type classes
* @class LGraphNode
* @param {String} name a name for the node
*/

global.LGraphNode = LiteGraph.LGraphNode = function LGraphNode(title)
{
	this._ctor();
}

LGraphNode.prototype._ctor = function( title )
{
	this.title = title || "Unnamed";
	this.size = [LiteGraph.NODE_WIDTH,60];
	this.graph = null;

	this._pos = new Float32Array(10,10);

	Object.defineProperty( this, "pos", {
		set: function(v)
		{
			if(!v || !v.length < 2)
				return;
			this._pos[0] = v[0];
			this._pos[1] = v[1];
		},
		get: function()
		{
			return this._pos;
		},
		enumerable: true
	});

	this.id = -1; //not know till not added
	this.type = null;

	//inputs available: array of inputs
	this.inputs = [];
	this.outputs = [];
	this.connections = [];

	//local data
	this.properties = {}; //for the values
	this.properties_info = []; //for the info

	this.data = null; //persistent local data
	this.flags = {
		//skip_title_render: true,
		//unsafe_execution: false,
	};
}

/**
* configure a node from an object containing the serialized info
* @method configure
*/
LGraphNode.prototype.configure = function(info)
{
	for (var j in info)
	{
		if(j == "console")
			continue;

		if(j == "properties")
		{
			//i dont want to clone properties, I want to reuse the old container
			for(var k in info.properties)
			{
				this.properties[k] = info.properties[k];
				if(this.onPropertyChanged)
					this.onPropertyChanged(k,info.properties[k]);
			}
			continue;
		}

		if(info[j] == null)
			continue;
		else if (typeof(info[j]) == 'object') //object
		{
			if(this[j] && this[j].configure)
				this[j].configure( info[j] );
			else
				this[j] = LiteGraph.cloneObject(info[j], this[j]);
		}
		else //value
			this[j] = info[j];
	}

	if(this.onConnectionsChange)
	{
		if(this.inputs)
		for(var i = 0; i < this.inputs.length; ++i)
		{
			var input = this.inputs[i];
			var link_info = this.graph.links[ input.link ];
			this.onConnectionsChange( LiteGraph.INPUT, i, true, link_info, input ); //link_info has been created now, so its updated
		}

		if(this.outputs)
		for(var i = 0; i < this.outputs.length; ++i)
		{
			var output = this.outputs[i];
			if(!output.links)
				continue;
			for(var j = 0; j < output.links.length; ++j)
			{
				var link_info = this.graph.links[ output.links[j] ];
				this.onConnectionsChange( LiteGraph.OUTPUT, i, true, link_info, output ); //link_info has been created now, so its updated
			}
		}
	}

	//FOR LEGACY, PLEASE REMOVE ON NEXT VERSION
	for(var i in this.inputs)
	{
		var input = this.inputs[i];
		if(!input.link || !input.link.length )
			continue;
		var link = input.link;
		if(typeof(link) != "object")
			continue;
		input.link = link[0];
		this.graph.links[ link[0] ] = {
			id: link[0],
			origin_id: link[1],
			origin_slot: link[2],
			target_id: link[3],
			target_slot: link[4]
		};
	}
	for(var i in this.outputs)
	{
		var output = this.outputs[i];
		if(!output.links || output.links.length == 0)
			continue;
		for(var j in output.links)
		{
			var link = output.links[j];
			if(typeof(link) != "object")
				continue;
			output.links[j] = link[0];
		}
	}

	if( this.onConfigure )
		this.onConfigure( info );
}

/**
* serialize the content
* @method serialize
*/

LGraphNode.prototype.serialize = function()
{
	//clear outputs last data (because data in connections is never serialized but stored inside the outputs info)
	if(this.outputs)
		for(var i = 0; i < this.outputs.length; i++)
			delete this.outputs[i]._data;

	//create serialization object
	var o = {
		id: this.id,
		title: this.title,
		type: this.type,
		pos: this.pos,
		size: this.size,
		data: this.data,
		flags: LiteGraph.cloneObject(this.flags),
		inputs: this.inputs,
		outputs: this.outputs,
		mode: this.mode
	};

	if(this.properties)
		o.properties = LiteGraph.cloneObject(this.properties);

	if(!o.type)
		o.type = this.constructor.type;

	if(this.color)
		o.color = this.color;
	if(this.bgcolor)
		o.bgcolor = this.bgcolor;
	if(this.boxcolor)
		o.boxcolor = this.boxcolor;
	if(this.shape)
		o.shape = this.shape;

	if(this.onSerialize)
		this.onSerialize(o);

	return o;
}


/* Creates a clone of this node */
LGraphNode.prototype.clone = function()
{
	var node = LiteGraph.createNode(this.type);

	//we clone it because serialize returns shared containers
	var data = LiteGraph.cloneObject( this.serialize() );

	//remove links
	if(data.inputs)
		for(var i = 0; i < data.inputs.length; ++i)
			data.inputs[i].link = null;

	if(data.outputs)
		for(var i = 0; i < data.outputs.length; ++i)
		{
			if(data.outputs[i].links)
				data.outputs[i].links.length = 0;
		}

	delete data["id"];
	//remove links
	node.configure(data);

	return node;
}


/**
* serialize and stringify
* @method toString
*/

LGraphNode.prototype.toString = function()
{
	return JSON.stringify( this.serialize() );
}
//LGraphNode.prototype.unserialize = function(info) {} //this cannot be done from within, must be done in LiteGraph


/**
* get the title string
* @method getTitle
*/

LGraphNode.prototype.getTitle = function()
{
	return this.title || this.constructor.title;
}



// Execution *************************
/**
* sets the output data
* @method setOutputData
* @param {number} slot
* @param {*} data
*/
LGraphNode.prototype.setOutputData = function(slot, data)
{
	if(!this.outputs)
		return;

	//this maybe slow and a niche case
	//if(slot && slot.constructor === String)
	//	slot = this.findOutputSlot(slot);

	if(slot == -1 || slot >= this.outputs.length)
		return;

	var output_info = this.outputs[slot];
	if(!output_info)
		return;

	//store data in the output itself in case we want to debug
	output_info._data = data;

	//if there are connections, pass the data to the connections
	if( this.outputs[slot].links )
	{
		for(var i = 0; i < this.outputs[slot].links.length; i++)
		{
			var link_id = this.outputs[slot].links[i];
			this.graph.links[ link_id ].data = data;
		}
	}
}

/**
* retrieves the input data (data traveling through the connection) from one slot
* @method getInputData
* @param {number} slot
* @param {boolean} force_update if set to true it will force the connected node of this slot to output data into this link
* @return {*} data or if it is not connected returns undefined
*/
LGraphNode.prototype.getInputData = function( slot, force_update )
{
	if(!this.inputs)
		return; //undefined;

	if(slot >= this.inputs.length || this.inputs[slot].link == null)
		return;

	var link_id = this.inputs[slot].link;
	var link = this.graph.links[ link_id ];
	if(!link) //bug: weird case but it happens sometimes
		return null;

	//used to extract data from the incomming connection
	if(!force_update)
		return link.data;

	var node = this.graph.getNodeById( link.origin_id );
	if(!node)
		return link.data;

	if(node.updateOutputData)
		node.updateOutputData( link.origin_slot );
	else if(node.onExecute)
		node.onExecute();

	return link.data;
}

/**
* tells you if there is a connection in one input slot
* @method isInputConnected
* @param {number} slot
* @return {boolean}
*/
LGraphNode.prototype.isInputConnected = function(slot)
{
	if(!this.inputs)
		return false;
	return (slot < this.inputs.length && this.inputs[slot].link != null);
}

/**
* tells you info about an input connection (which node, type, etc)
* @method getInputInfo
* @param {number} slot
* @return {Object} object or null { link: id, name: string, type: string or 0 }
*/
LGraphNode.prototype.getInputInfo = function(slot)
{
	if(!this.inputs)
		return null;
	if(slot < this.inputs.length)
		return this.inputs[slot];
	return null;
}

/**
* returns the node connected in the input slot
* @method getInputNode
* @param {number} slot
* @return {LGraphNode} node or null
*/
LGraphNode.prototype.getInputNode = function( slot )
{
	if(!this.inputs)
		return null;
	if(slot >= this.inputs.length)
		return null;
	var input = this.inputs[slot];
	if(!input || !input.link)
		return null;
	var link_info = this.graph.links[ input.link ];
	if(!link_info)
		return null;
	return this.graph.getNodeById( link_info.origin_id );
}

/**
* tells you the last output data that went in that slot
* @method getOutputData
* @param {number} slot
* @return {Object}  object or null
*/
LGraphNode.prototype.getOutputData = function(slot)
{
	if(!this.outputs)
		return null;
	if(slot >= this.outputs.length)
		return null;

	var info = this.outputs[slot];
	return info._data;
}


/**
* tells you info about an output connection (which node, type, etc)
* @method getOutputInfo
* @param {number} slot
* @return {Object}  object or null { name: string, type: string, links: [ ids of links in number ] }
*/
LGraphNode.prototype.getOutputInfo = function(slot)
{
	if(!this.outputs)
		return null;
	if(slot < this.outputs.length)
		return this.outputs[slot];
	return null;
}


/**
* tells you if there is a connection in one output slot
* @method isOutputConnected
* @param {number} slot
* @return {boolean}
*/
LGraphNode.prototype.isOutputConnected = function(slot)
{
	if(!this.outputs)
		return null;
	return (slot < this.outputs.length && this.outputs[slot].links && this.outputs[slot].links.length);
}

/**
* retrieves all the nodes connected to this output slot
* @method getOutputNodes
* @param {number} slot
* @return {array}
*/
LGraphNode.prototype.getOutputNodes = function(slot)
{
	if(!this.outputs || this.outputs.length == 0)
		return null;

	if(slot >= this.outputs.length)
		return null;

	var output = this.outputs[slot];
	if(!output.links || output.links.length == 0)
		return null;

	var r = [];
	for(var i = 0; i < output.links.length; i++)
	{
		var link_id = output.links[i];
		var link = this.graph.links[ link_id ];
		if(link)
		{
			var target_node = this.graph.getNodeById( link.target_id );
			if( target_node )
				r.push( target_node );
		}
	}
	return r;
}

/**
* Triggers an event in this node, this will trigger any output with the same name
* @method trigger
* @param {String} event name ( "on_play", ... ) if action is equivalent to false then the event is send to all
* @param {*} param
*/
LGraphNode.prototype.trigger = function( action, param )
{
	if( !this.outputs || !this.outputs.length )
		return;

	if(this.graph)
		this.graph._last_trigger_time = LiteGraph.getTime();

	for(var i = 0; i < this.outputs.length; ++i)
	{
		var output = this.outputs[ i ];
		if(!output || output.type !== LiteGraph.EVENT || (action && output.name != action) )
			continue;
		this.triggerSlot( i, param );
	}
}

/**
* Triggers an slot event in this node
* @method triggerSlot
* @param {Number} slot the index of the output slot
* @param {*} param
*/
LGraphNode.prototype.triggerSlot = function( slot, param )
{
	if( !this.outputs )
		return;

	var output = this.outputs[ slot ];
	if( !output )
		return;

	var links = output.links;
	if(!links || !links.length)
		return;

	if(this.graph)
		this.graph._last_trigger_time = LiteGraph.getTime();

	//for every link attached here
	for(var k = 0; k < links.length; ++k)
	{
		var link_info = this.graph.links[ links[k] ];
		if(!link_info) //not connected
			continue;
		var node = this.graph.getNodeById( link_info.target_id );
		if(!node) //node not found?
			continue;

		//used to mark events in graph
		link_info._last_time = LiteGraph.getTime();

		var target_connection = node.inputs[ link_info.target_slot ];

		if(node.onAction)
			node.onAction( target_connection.name, param );
		else if(node.mode === LiteGraph.ON_TRIGGER)
		{
			if(node.onExecute)
				node.onExecute(param);
		}
	}
}

/**
* add a new property to this node
* @method addProperty
* @param {string} name
* @param {*} default_value
* @param {string} type string defining the output type ("vec3","number",...)
* @param {Object} extra_info this can be used to have special properties of the property (like values, etc)
*/
LGraphNode.prototype.addProperty = function( name, default_value, type, extra_info )
{
	var o = { name: name, type: type, default_value: default_value };
	if(extra_info)
		for(var i in extra_info)
			o[i] = extra_info[i];
	if(!this.properties_info)
		this.properties_info = [];
	this.properties_info.push(o);
	if(!this.properties)
		this.properties = {};
	this.properties[ name ] = default_value;
	return o;
}


//connections

/**
* add a new output slot to use in this node
* @method addOutput
* @param {string} name
* @param {string} type string defining the output type ("vec3","number",...)
* @param {Object} extra_info this can be used to have special properties of an output (label, special color, position, etc)
*/
LGraphNode.prototype.addOutput = function(name,type,extra_info)
{
	var o = { name: name, type: type, links: null };
	if(extra_info)
		for(var i in extra_info)
			o[i] = extra_info[i];

	if(!this.outputs)
		this.outputs = [];
	this.outputs.push(o);
	if(this.onOutputAdded)
		this.onOutputAdded(o);
	this.size = this.computeSize();
	return o;
}

/**
* add a new output slot to use in this node
* @method addOutputs
* @param {Array} array of triplets like [[name,type,extra_info],[...]]
*/
LGraphNode.prototype.addOutputs = function(array)
{
	for(var i = 0; i < array.length; ++i)
	{
		var info = array[i];
		var o = {name:info[0],type:info[1],link:null};
		if(array[2])
			for(var j in info[2])
				o[j] = info[2][j];

		if(!this.outputs)
			this.outputs = [];
		this.outputs.push(o);
		if(this.onOutputAdded)
			this.onOutputAdded(o);
	}

	this.size = this.computeSize();
}

/**
* remove an existing output slot
* @method removeOutput
* @param {number} slot
*/
LGraphNode.prototype.removeOutput = function(slot)
{
	this.disconnectOutput(slot);
	this.outputs.splice(slot,1);
	this.size = this.computeSize();
	if(this.onOutputRemoved)
		this.onOutputRemoved(slot);
}

/**
* add a new input slot to use in this node
* @method addInput
* @param {string} name
* @param {string} type string defining the input type ("vec3","number",...), it its a generic one use 0
* @param {Object} extra_info this can be used to have special properties of an input (label, color, position, etc)
*/
LGraphNode.prototype.addInput = function(name,type,extra_info)
{
	type = type || 0;
	var o = {name:name,type:type,link:null};
	if(extra_info)
		for(var i in extra_info)
			o[i] = extra_info[i];

	if(!this.inputs)
		this.inputs = [];
	this.inputs.push(o);
	this.size = this.computeSize();
	if(this.onInputAdded)
		this.onInputAdded(o);
	return o;
}

/**
* add several new input slots in this node
* @method addInputs
* @param {Array} array of triplets like [[name,type,extra_info],[...]]
*/
LGraphNode.prototype.addInputs = function(array)
{
	for(var i = 0; i < array.length; ++i)
	{
		var info = array[i];
		var o = {name:info[0], type:info[1], link:null};
		if(array[2])
			for(var j in info[2])
				o[j] = info[2][j];

		if(!this.inputs)
			this.inputs = [];
		this.inputs.push(o);
		if(this.onInputAdded)
			this.onInputAdded(o);
	}

	this.size = this.computeSize();
}

/**
* remove an existing input slot
* @method removeInput
* @param {number} slot
*/
LGraphNode.prototype.removeInput = function(slot)
{
	this.disconnectInput(slot);
	this.inputs.splice(slot,1);
	this.size = this.computeSize();
	if(this.onInputRemoved)
		this.onInputRemoved(slot);
}

/**
* add an special connection to this node (used for special kinds of graphs)
* @method addConnection
* @param {string} name
* @param {string} type string defining the input type ("vec3","number",...)
* @param {[x,y]} pos position of the connection inside the node
* @param {string} direction if is input or output
*/
LGraphNode.prototype.addConnection = function(name,type,pos,direction)
{
	var o = {
		name: name,
		type: type,
		pos: pos,
		direction: direction,
		links: null
	};
	this.connections.push( o );
	return o;
}

/**
* computes the size of a node according to its inputs and output slots
* @method computeSize
* @param {number} minHeight
* @return {number} the total size
*/
LGraphNode.prototype.computeSize = function( minHeight, out )
{
	var rows = Math.max( this.inputs ? this.inputs.length : 1, this.outputs ? this.outputs.length : 1);
	var size = out || new Float32Array([0,0]);
	rows = Math.max(rows, 1);
	size[1] = rows * 14 + 6;

	var font_size = 14;
	var title_width = compute_text_size( this.title );
	var input_width = 0;
	var output_width = 0;

	if(this.inputs)
		for(var i = 0, l = this.inputs.length; i < l; ++i)
		{
			var input = this.inputs[i];
			var text = input.label || input.name || "";
			var text_width = compute_text_size( text );
			if(input_width < text_width)
				input_width = text_width;
		}

	if(this.outputs)
		for(var i = 0, l = this.outputs.length; i < l; ++i)
		{
			var output = this.outputs[i];
			var text = output.label || output.name || "";
			var text_width = compute_text_size( text );
			if(output_width < text_width)
				output_width = text_width;
		}

	size[0] = Math.max( input_width + output_width + 10, title_width );
	size[0] = Math.max( size[0], LiteGraph.NODE_WIDTH );

	function compute_text_size( text )
	{
		if(!text)
			return 0;
		return font_size * text.length * 0.6;
	}

	return size;
}

/**
* returns the bounding of the object, used for rendering purposes
* @method getBounding
* @return {Float32Array[4]} the total size
*/
LGraphNode.prototype.getBounding = function()
{
	return new Float32Array([this.pos[0] - 4, this.pos[1] - LiteGraph.NODE_TITLE_HEIGHT, this.pos[0] + this.size[0] + 4, this.pos[1] + this.size[1] + LGraph.NODE_TITLE_HEIGHT]);
}

/**
* checks if a point is inside the shape of a node
* @method isPointInsideNode
* @param {number} x
* @param {number} y
* @return {boolean}
*/
LGraphNode.prototype.isPointInsideNode = function(x,y, margin)
{
	margin = margin || 0;

	var margin_top = this.graph && this.graph.isLive() ? 0 : 20;
	if(this.flags.collapsed)
	{
		//if ( distance([x,y], [this.pos[0] + this.size[0]*0.5, this.pos[1] + this.size[1]*0.5]) < LiteGraph.NODE_COLLAPSED_RADIUS)
		if( isInsideRectangle( x, y, this.pos[0] - margin, this.pos[1] - LiteGraph.NODE_TITLE_HEIGHT - margin, LiteGraph.NODE_COLLAPSED_WIDTH + 2 * margin, LiteGraph.NODE_TITLE_HEIGHT + 2 * margin ) )
			return true;
	}
	else if ( (this.pos[0] - 4 - margin) < x && (this.pos[0] + this.size[0] + 4 + margin) > x
		&& (this.pos[1] - margin_top - margin) < y && (this.pos[1] + this.size[1] + margin) > y)
		return true;
	return false;
}

/**
* checks if a point is inside a node slot, and returns info about which slot
* @method getSlotInPosition
* @param {number} x
* @param {number} y
* @return {Object} if found the object contains { input|output: slot object, slot: number, link_pos: [x,y] }
*/
LGraphNode.prototype.getSlotInPosition = function( x, y )
{
	//search for inputs
	if(this.inputs)
		for(var i = 0, l = this.inputs.length; i < l; ++i)
		{
			var input = this.inputs[i];
			var link_pos = this.getConnectionPos( true,i );
			if( isInsideRectangle(x, y, link_pos[0] - 10, link_pos[1] - 5, 20,10) )
				return { input: input, slot: i, link_pos: link_pos, locked: input.locked };
		}

	if(this.outputs)
		for(var i = 0, l = this.outputs.length; i < l; ++i)
		{
			var output = this.outputs[i];
			var link_pos = this.getConnectionPos(false,i);
			if( isInsideRectangle(x, y, link_pos[0] - 10, link_pos[1] - 5, 20,10) )
				return { output: output, slot: i, link_pos: link_pos, locked: output.locked };
		}

	return null;
}

/**
* returns the input slot with a given name (used for dynamic slots), -1 if not found
* @method findInputSlot
* @param {string} name the name of the slot
* @return {number} the slot (-1 if not found)
*/
LGraphNode.prototype.findInputSlot = function(name)
{
	if(!this.inputs)
		return -1;
	for(var i = 0, l = this.inputs.length; i < l; ++i)
		if(name == this.inputs[i].name)
			return i;
	return -1;
}

/**
* returns the output slot with a given name (used for dynamic slots), -1 if not found
* @method findOutputSlot
* @param {string} name the name of the slot
* @return {number} the slot (-1 if not found)
*/
LGraphNode.prototype.findOutputSlot = function(name)
{
	if(!this.outputs) return -1;
	for(var i = 0, l = this.outputs.length; i < l; ++i)
		if(name == this.outputs[i].name)
			return i;
	return -1;
}

/**
* connect this node output to the input of another node
* @method connect
* @param {number_or_string} slot (could be the number of the slot or the string with the name of the slot)
* @param {LGraphNode} node the target node
* @param {number_or_string} target_slot the input slot of the target node (could be the number of the slot or the string with the name of the slot, or -1 to connect a trigger)
* @return {boolean} if it was connected succesfully
*/
LGraphNode.prototype.connect = function( slot, target_node, target_slot )
{
	target_slot = target_slot || 0;

	//seek for the output slot
	if( slot.constructor === String )
	{
		slot = this.findOutputSlot(slot);
		if(slot == -1)
		{
			if(LiteGraph.debug)
				console.log("Connect: Error, no slot of name " + slot);
			return false;
		}
	}
	else if(!this.outputs || slot >= this.outputs.length)
	{
		if(LiteGraph.debug)
			console.log("Connect: Error, slot number not found");
		return false;
	}

	if(target_node && target_node.constructor === Number)
		target_node = this.graph.getNodeById( target_node );
	if(!target_node)
		throw("Node not found");

	//avoid loopback
	if(target_node == this)
		return false;

	//you can specify the slot by name
	if(target_slot.constructor === String)
	{
		target_slot = target_node.findInputSlot( target_slot );
		if(target_slot == -1)
		{
			if(LiteGraph.debug)
				console.log("Connect: Error, no slot of name " + target_slot);
			return false;
		}
	}
	else if( target_slot === LiteGraph.EVENT )
	{
		//search for first slot with event?
		/*
		//create input for trigger
		var input = target_node.addInput("onTrigger", LiteGraph.EVENT );
		target_slot = target_node.inputs.length - 1; //last one is the one created
		target_node.mode = LiteGraph.ON_TRIGGER;
		*/
		return false;
	}
	else if( !target_node.inputs || target_slot >= target_node.inputs.length )
	{
		if(LiteGraph.debug)
			console.log("Connect: Error, slot number not found");
		return false;
	}

	//if there is something already plugged there, disconnect
	if(target_node.inputs[ target_slot ].link != null )
		target_node.disconnectInput( target_slot );

	//why here??
	this.setDirtyCanvas(false,true);
	this.graph.connectionChange( this );

	var output = this.outputs[slot];

	//allows nodes to block connection
	if(target_node.onConnectInput)
		if( target_node.onConnectInput( target_slot, output.type, output ) === false)
			return false;

	var input = target_node.inputs[target_slot];

	if( LiteGraph.isValidConnection( output.type, input.type ) )
	{
		var link_info = {
			id: this.graph.last_link_id++,
			type: input.type,
			origin_id: this.id,
			origin_slot: slot,
			target_id: target_node.id,
			target_slot: target_slot
		};

		//add to graph links list
		this.graph.links[ link_info.id ] = link_info;

		//connect in output
		if( output.links == null )
			output.links = [];
		output.links.push( link_info.id );
		//connect in input
		target_node.inputs[target_slot].link = link_info.id;

		if(this.onConnectionsChange)
			this.onConnectionsChange( LiteGraph.OUTPUT, slot, true, link_info, output ); //link_info has been created now, so its updated
		if(target_node.onConnectionsChange)
			target_node.onConnectionsChange( LiteGraph.INPUT, target_slot, true, link_info, input );
	}

	this.setDirtyCanvas(false,true);
	this.graph.connectionChange( this );

	return true;
}

/**
* disconnect one output to an specific node
* @method disconnectOutput
* @param {number_or_string} slot (could be the number of the slot or the string with the name of the slot)
* @param {LGraphNode} target_node the target node to which this slot is connected [Optional, if not target_node is specified all nodes will be disconnected]
* @return {boolean} if it was disconnected succesfully
*/
LGraphNode.prototype.disconnectOutput = function( slot, target_node )
{
	if( slot.constructor === String )
	{
		slot = this.findOutputSlot(slot);
		if(slot == -1)
		{
			if(LiteGraph.debug)
				console.log("Connect: Error, no slot of name " + slot);
			return false;
		}
	}
	else if(!this.outputs || slot >= this.outputs.length)
	{
		if(LiteGraph.debug)
			console.log("Connect: Error, slot number not found");
		return false;
	}

	//get output slot
	var output = this.outputs[slot];
	if(!output.links || output.links.length == 0)
		return false;

	//one of the links
	if(target_node)
	{
		if(target_node.constructor === Number)
			target_node = this.graph.getNodeById( target_node );
		if(!target_node)
			throw("Target Node not found");

		for(var i = 0, l = output.links.length; i < l; i++)
		{
			var link_id = output.links[i];
			var link_info = this.graph.links[ link_id ];

			//is the link we are searching for...
			if( link_info.target_id == target_node.id )
			{
				output.links.splice(i,1); //remove here
				var input = target_node.inputs[ link_info.target_slot ];
				input.link = null; //remove there
				delete this.graph.links[ link_id ]; //remove the link from the links pool
				if(target_node.onConnectionsChange)
					target_node.onConnectionsChange( LiteGraph.INPUT, link_info.target_slot, false, link_info, input ); //link_info hasnt been modified so its ok
				if(this.onConnectionsChange)
					this.onConnectionsChange( LiteGraph.OUTPUT, slot, false, link_info, output );
				break;
			}
		}
	}
	else //all the links
	{
		for(var i = 0, l = output.links.length; i < l; i++)
		{
			var link_id = output.links[i];
			var link_info = this.graph.links[ link_id ];
			if(!link_info) //bug: it happens sometimes
				continue;

			var target_node = this.graph.getNodeById( link_info.target_id );
			var input = null;
			if(target_node)
			{
				input = target_node.inputs[ link_info.target_slot ];
				input.link = null; //remove other side link
				if(target_node.onConnectionsChange)
					target_node.onConnectionsChange( LiteGraph.INPUT, link_info.target_slot, false, link_info, input ); //link_info hasnt been modified so its ok
			}
			delete this.graph.links[ link_id ]; //remove the link from the links pool
			if(this.onConnectionsChange)
				this.onConnectionsChange( LiteGraph.OUTPUT, slot, false, link_info, output );
		}
		output.links = null;
	}


	this.setDirtyCanvas(false,true);
	this.graph.connectionChange( this );
	return true;
}

/**
* disconnect one input
* @method disconnectInput
* @param {number_or_string} slot (could be the number of the slot or the string with the name of the slot)
* @return {boolean} if it was disconnected succesfully
*/
LGraphNode.prototype.disconnectInput = function( slot )
{
	//seek for the output slot
	if( slot.constructor === String )
	{
		slot = this.findInputSlot(slot);
		if(slot == -1)
		{
			if(LiteGraph.debug)
				console.log("Connect: Error, no slot of name " + slot);
			return false;
		}
	}
	else if(!this.inputs || slot >= this.inputs.length)
	{
		if(LiteGraph.debug)
			console.log("Connect: Error, slot number not found");
		return false;
	}

	var input = this.inputs[slot];
	if(!input)
		return false;

	var link_id = this.inputs[slot].link;
	this.inputs[slot].link = null;

	//remove other side
	var link_info = this.graph.links[ link_id ];
	if( link_info )
	{
		var target_node = this.graph.getNodeById( link_info.origin_id );
		if(!target_node)
			return false;

		var output = target_node.outputs[ link_info.origin_slot ];
		if(!output || !output.links || output.links.length == 0)
			return false;

		//search in the inputs list for this link
		for(var i = 0, l = output.links.length; i < l; i++)
		{
			var link_id = output.links[i];
			if( link_info.target_id == this.id )
			{
				output.links.splice(i,1);
				break;
			}
		}

		delete this.graph.links[ link_id ]; //remove from the pool

		if( this.onConnectionsChange )
			this.onConnectionsChange( LiteGraph.INPUT, slot, false, link_info, input );
		if( target_node.onConnectionsChange )
			target_node.onConnectionsChange( LiteGraph.OUTPUT, i, false, link_info, output );
	}

	this.setDirtyCanvas(false,true);
	this.graph.connectionChange( this );
	return true;
}

/**
* returns the center of a connection point in canvas coords
* @method getConnectionPos
* @param {boolean} is_input true if if a input slot, false if it is an output
* @param {number_or_string} slot (could be the number of the slot or the string with the name of the slot)
* @return {[x,y]} the position
**/
LGraphNode.prototype.getConnectionPos = function(is_input, slot_number)
{
	if(this.flags.collapsed)
	{
		if(is_input)
			return [this.pos[0], this.pos[1] - LiteGraph.NODE_TITLE_HEIGHT * 0.5];
		else
			return [this.pos[0] + LiteGraph.NODE_COLLAPSED_WIDTH, this.pos[1] - LiteGraph.NODE_TITLE_HEIGHT * 0.5];
		//return [this.pos[0] + this.size[0] * 0.5, this.pos[1] + this.size[1] * 0.5];
	}

	if(is_input && slot_number == -1)
	{
		return [this.pos[0] + 10, this.pos[1] + 10];
	}

	if(is_input && this.inputs.length > slot_number && this.inputs[slot_number].pos)
		return [this.pos[0] + this.inputs[slot_number].pos[0],this.pos[1] + this.inputs[slot_number].pos[1]];
	else if(!is_input && this.outputs.length > slot_number && this.outputs[slot_number].pos)
		return [this.pos[0] + this.outputs[slot_number].pos[0],this.pos[1] + this.outputs[slot_number].pos[1]];

	if(!is_input) //output
		return [this.pos[0] + this.size[0] + 1, this.pos[1] + 10 + slot_number * LiteGraph.NODE_SLOT_HEIGHT];
	return [this.pos[0] , this.pos[1] + 10 + slot_number * LiteGraph.NODE_SLOT_HEIGHT];
}

/* Force align to grid */
LGraphNode.prototype.alignToGrid = function()
{
	this.pos[0] = LiteGraph.CANVAS_GRID_SIZE * Math.round(this.pos[0] / LiteGraph.CANVAS_GRID_SIZE);
	this.pos[1] = LiteGraph.CANVAS_GRID_SIZE * Math.round(this.pos[1] / LiteGraph.CANVAS_GRID_SIZE);
}


/* Console output */
LGraphNode.prototype.trace = function(msg)
{
	if(!this.console)
		this.console = [];
	this.console.push(msg);
	if(this.console.length > LGraphNode.MAX_CONSOLE)
		this.console.shift();

	this.graph.onNodeTrace(this,msg);
}

/* Forces to redraw or the main canvas (LGraphNode) or the bg canvas (links) */
LGraphNode.prototype.setDirtyCanvas = function(dirty_foreground, dirty_background)
{
	if(!this.graph)
		return;
	this.graph.sendActionToCanvas("setDirty",[dirty_foreground, dirty_background]);
}

LGraphNode.prototype.loadImage = function(url)
{
	var img = new Image();
	img.src = LiteGraph.node_images_path + url;
	img.ready = false;

	var that = this;
	img.onload = function() {
		this.ready = true;
		that.setDirtyCanvas(true);
	}
	return img;
}

//safe LGraphNode action execution (not sure if safe)
/*
LGraphNode.prototype.executeAction = function(action)
{
	if(action == "") return false;

	if( action.indexOf(";") != -1 || action.indexOf("}") != -1)
	{
		this.trace("Error: Action contains unsafe characters");
		return false;
	}

	var tokens = action.split("(");
	var func_name = tokens[0];
	if( typeof(this[func_name]) != "function")
	{
		this.trace("Error: Action not found on node: " + func_name);
		return false;
	}

	var code = action;

	try
	{
		var _foo = eval;
		eval = null;
		(new Function("with(this) { " + code + "}")).call(this);
		eval = _foo;
	}
	catch (err)
	{
		this.trace("Error executing action {" + action + "} :" + err);
		return false;
	}

	return true;
}
*/

/* Allows to get onMouseMove and onMouseUp events even if the mouse is out of focus */
LGraphNode.prototype.captureInput = function(v)
{
	if(!this.graph || !this.graph.list_of_graphcanvas)
		return;

	var list = this.graph.list_of_graphcanvas;

	for(var i = 0; i < list.length; ++i)
	{
		var c = list[i];
		//releasing somebody elses capture?!
		if(!v && c.node_capturing_input != this)
			continue;

		//change
		c.node_capturing_input = v ? this : null;
	}
}

/**
* Collapse the node to make it smaller on the canvas
* @method collapse
**/
LGraphNode.prototype.collapse = function()
{
	if(!this.flags.collapsed)
		this.flags.collapsed = true;
	else
		this.flags.collapsed = false;
	this.setDirtyCanvas(true,true);
}

/**
* Forces the node to do not move or realign on Z
* @method pin
**/

LGraphNode.prototype.pin = function(v)
{
	if(v === undefined)
		this.flags.pinned = !this.flags.pinned;
	else
		this.flags.pinned = v;
}

LGraphNode.prototype.localToScreen = function(x,y, graphcanvas)
{
	return [(x + this.pos[0]) * graphcanvas.scale + graphcanvas.offset[0],
		(y + this.pos[1]) * graphcanvas.scale + graphcanvas.offset[1]];
}



//*********************************************************************************
// LGraphCanvas: LGraph renderer CLASS
//*********************************************************************************

/**
* The Global Scope. It contains all the registered node classes.
* Valid callbacks are: onNodeSelected, onNodeDeselected, onShowNodePanel, onNodeDblClicked
*
* @class LGraphCanvas
* @constructor
* @param {HTMLCanvas} canvas the canvas where you want to render (it accepts a selector in string format or the canvas element itself)
* @param {LGraph} graph [optional]
* @param {Object} options [optional] { skip_rendering, autoresize }
*/
global.LGraphCanvas = LiteGraph.LGraphCanvas = function LGraphCanvas( canvas, graph, options )
{
	options = options || {};

	//if(graph === undefined)
  //	throw ("No graph assigned");
  this.background_image = 'data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAGQAAABkCAIAAAD/gAIDAAAAGXRFWHRTb2Z0d2FyZQBBZG9iZSBJbWFnZVJlYWR5ccllPAAAAQBJREFUeNrs1rEKwjAUhlETUkj3vP9rdmr1Ysammk2w5wdxuLgcMHyptfawuZX4pJSWZTnfnu/lnIe/jNNxHHGNn//HNbbv+4dr6V+11uF527arU7+u63qfa/bnmh8sWLBgwYJlqRf8MEptXPBXJXa37BSl3ixYsGDBMliwFLyCV/DeLIMFCxYsWLBMwSt4Be/NggXLYMGCBUvBK3iNruC9WbBgwYJlsGApeAWv4L1ZBgsWLFiwYJmCV/AK3psFC5bBggULloJX8BpdwXuzYMGCBctgwVLwCl7Be7MMFixYsGDBsu8FH1FaSmExVfAxBa/gvVmwYMGCZbBg/W4vAQYA5tRF9QYlv/QAAAAASUVORK5CYII='

	if(canvas && canvas.constructor === String )
		canvas = document.querySelector( canvas );

	this.max_zoom = 10;
	this.min_zoom = 0.1;

	this.title_text_font = "bold 14px Arial";
	this.inner_text_font = "normal 12px Arial";
	this.default_link_color = "#AAC";

	this.highquality_render = true;
	this.editor_alpha = 1; //used for transition
	this.pause_rendering = false;
	this.render_shadows = true;
	this.clear_background = true;

	this.render_only_selected = true;
	this.live_mode = false;
	this.show_info = true;
	this.allow_dragcanvas = true;
	this.allow_dragnodes = true;
	this.allow_interaction = true; //allow to control widgets, buttons, collapse, etc

	this.always_render_background = false;
	this.render_connections_shadows = false; //too much cpu
	this.render_connections_border = true;
	this.render_curved_connections = true;
	this.render_connection_arrows = true;

	this.connections_width = 3;

	//link canvas and graph
	if(graph)
		graph.attachCanvas(this);

	this.setCanvas( canvas );
	this.clear();

	if(!options.skip_render)
		this.startRendering();

	this.autoresize = options.autoresize;
}

LGraphCanvas.link_type_colors = {"-1":"#F85",'number':"#AAC","node":"#DCA"};


/**
* clears all the data inside
*
* @method clear
*/
LGraphCanvas.prototype.clear = function()
{
	this.frame = 0;
	this.last_draw_time = 0;
	this.render_time = 0;
	this.fps = 0;

	this.scale = 1;
	this.offset = [0,0];

	this.selected_nodes = {};
	this.node_dragged = null;
	this.node_over = null;
	this.node_capturing_input = null;
	this.connecting_node = null;

	this.dirty_canvas = true;
	this.dirty_bgcanvas = true;
	this.dirty_area = null;

	this.node_in_panel = null;

	this.last_mouse = [0,0];
	this.last_mouseclick = 0;

	if(this.onClear)
		this.onClear();
	//this.UIinit();
}

/**
* assigns a graph, you can reasign graphs to the same canvas
*
* @method setGraph
* @param {LGraph} graph
*/
LGraphCanvas.prototype.setGraph = function( graph, skip_clear )
{
	if(this.graph == graph)
		return;

	if(!skip_clear)
		this.clear();

	if(!graph && this.graph)
	{
		this.graph.detachCanvas(this);
		return;
	}

	/*
	if(this.graph)
		this.graph.canvas = null; //remove old graph link to the canvas
	this.graph = graph;
	if(this.graph)
		this.graph.canvas = this;
	*/
	graph.attachCanvas(this);
	this.setDirty(true,true);
}

/**
* opens a graph contained inside a node in the current graph
*
* @method openSubgraph
* @param {LGraph} graph
*/
LGraphCanvas.prototype.openSubgraph = function(graph)
{
	if(!graph)
		throw("graph cannot be null");

	if(this.graph == graph)
		throw("graph cannot be the same");

	this.clear();

	if(this.graph)
	{
		if(!this._graph_stack)
			this._graph_stack = [];
		this._graph_stack.push(this.graph);
	}

	graph.attachCanvas(this);
	this.setDirty(true,true);
}

/**
* closes a subgraph contained inside a node
*
* @method closeSubgraph
* @param {LGraph} assigns a graph
*/
LGraphCanvas.prototype.closeSubgraph = function()
{
	if(!this._graph_stack || this._graph_stack.length == 0)
		return;
	var graph = this._graph_stack.pop();
	graph.attachCanvas(this);
	this.setDirty(true,true);
}

/**
* assigns a canvas
*
* @method setCanvas
* @param {Canvas} assigns a canvas (also accepts the ID of the element (not a selector)
*/
LGraphCanvas.prototype.setCanvas = function( canvas, skip_events )
{
	var that = this;

	if(canvas)
	{
		if( canvas.constructor === String )
		{
			canvas = document.getElementById(canvas);
			if(!canvas)
				throw("Error creating LiteGraph canvas: Canvas not found");
		}
	}

	if(canvas === this.canvas)
		return;

	if(!canvas && this.canvas)
	{
		//maybe detach events from old_canvas
		if(!skip_events)
			this.unbindEvents();
	}

	this.canvas = canvas;

	if(!canvas)
		return;

	//this.canvas.tabindex = "1000";
	canvas.className += " lgraphcanvas";
	canvas.data = this;

	//bg canvas: used for non changing stuff
	this.bgcanvas = null;
	if(!this.bgcanvas)
	{
		this.bgcanvas = document.createElement("canvas");
		this.bgcanvas.width = this.canvas.width;
		this.bgcanvas.height = this.canvas.height;
	}

	if(canvas.getContext == null)
	{
		if( canvas.localName != "canvas" )
			throw("Element supplied for LGraphCanvas must be a <canvas> element, you passed a " + canvas.localName );
		throw("This browser doesnt support Canvas");
	}

	var ctx = this.ctx = canvas.getContext("2d");
	if(ctx == null)
	{
		console.warn("This canvas seems to be WebGL, enabling WebGL renderer");
		this.enableWebGL();
	}

	//input:  (move and up could be unbinded)
	this._mousemove_callback = this.processMouseMove.bind(this);
	this._mouseup_callback = this.processMouseUp.bind(this);

	if(!skip_events)
		this.bindEvents();
}

//used in some events to capture them
LGraphCanvas.prototype._doNothing = function doNothing(e) { e.preventDefault(); return false; };
LGraphCanvas.prototype._doReturnTrue = function doNothing(e) { e.preventDefault(); return true; };

LGraphCanvas.prototype.bindEvents = function()
{
	if(	this._events_binded )
	{
		console.warn("LGraphCanvas: events already binded");
		return;
	}

	var canvas = this.canvas;

	this._mousedown_callback = this.processMouseDown.bind(this);
	this._mousewheel_callback = this.processMouseWheel.bind(this);

	canvas.addEventListener("mousedown", this._mousedown_callback, true ); //down do not need to store the binded
	canvas.addEventListener("mousemove", this._mousemove_callback );
	canvas.addEventListener("mousewheel", this._mousewheel_callback, false);

	canvas.addEventListener("contextmenu", this._doNothing );
	canvas.addEventListener("DOMMouseScroll", this._mousewheel_callback, false);

	//touch events
	//if( 'touchstart' in document.documentElement )
	{
		canvas.addEventListener("touchstart", this.touchHandler, true);
		canvas.addEventListener("touchmove", this.touchHandler, true);
		canvas.addEventListener("touchend", this.touchHandler, true);
		canvas.addEventListener("touchcancel", this.touchHandler, true);
	}

	//Keyboard ******************
	this._key_callback = this.processKey.bind(this);

	canvas.addEventListener("keydown", this._key_callback );
	canvas.addEventListener("keyup", this._key_callback );

	//Droping Stuff over nodes ************************************
	this._ondrop_callback = this.processDrop.bind(this);

	canvas.addEventListener("dragover", this._doNothing, false );
	canvas.addEventListener("dragend", this._doNothing, false );
	canvas.addEventListener("drop", this._ondrop_callback, false );
	canvas.addEventListener("dragenter", this._doReturnTrue, false );

	this._events_binded = true;
}

LGraphCanvas.prototype.unbindEvents = function()
{
	if(	!this._events_binded )
	{
		console.warn("LGraphCanvas: no events binded");
		return;
	}

	this.canvas.removeEventListener( "mousedown", this._mousedown_callback );
	this.canvas.removeEventListener( "mousewheel", this._mousewheel_callback );
	this.canvas.removeEventListener( "DOMMouseScroll", this._mousewheel_callback );
	this.canvas.removeEventListener( "keydown", this._key_callback );
	this.canvas.removeEventListener( "keyup", this._key_callback );
	this.canvas.removeEventListener( "contextmenu", this._doNothing );
	this.canvas.removeEventListener( "drop", this._ondrop_callback );
	this.canvas.removeEventListener( "dragenter", this._doReturnTrue );

	this.canvas.removeEventListener("touchstart", this.touchHandler );
	this.canvas.removeEventListener("touchmove", this.touchHandler );
	this.canvas.removeEventListener("touchend", this.touchHandler );
	this.canvas.removeEventListener("touchcancel", this.touchHandler );

	this._mousedown_callback = null;
	this._mousewheel_callback = null;
	this._key_callback = null;
	this._ondrop_callback = null;

	this._events_binded = false;
}

LGraphCanvas.getFileExtension = function (url)
{
	var question = url.indexOf("?");
	if(question != -1)
		url = url.substr(0,question);
	var point = url.lastIndexOf(".");
	if(point == -1)
		return "";
	return url.substr(point+1).toLowerCase();
}

//this file allows to render the canvas using WebGL instead of Canvas2D
//this is useful if you plant to render 3D objects inside your nodes
LGraphCanvas.prototype.enableWebGL = function()
{
	if(typeof(GL) === undefined)
		throw("litegl.js must be included to use a WebGL canvas");
	if(typeof(enableWebGLCanvas) === undefined)
		throw("webglCanvas.js must be included to use this feature");

	this.gl = this.ctx = enableWebGLCanvas(this.canvas);
	this.ctx.webgl = true;
	this.bgcanvas = this.canvas;
	this.bgctx = this.gl;

	/*
	GL.create({ canvas: this.bgcanvas });
	this.bgctx = enableWebGLCanvas( this.bgcanvas );
	window.gl = this.gl;
	*/
}


/*
LGraphCanvas.prototype.UIinit = function()
{
	var that = this;
	$("#node-console input").change(function(e)
	{
		if(e.target.value == "")
			return;

		var node = that.node_in_panel;
		if(!node)
			return;

		node.trace("] " + e.target.value, "#333");
		if(node.onConsoleCommand)
		{
			if(!node.onConsoleCommand(e.target.value))
				node.trace("command not found", "#A33");
		}
		else if (e.target.value == "info")
		{
			node.trace("Special methods:");
			for(var i in node)
			{
				if(typeof(node[i]) == "function" && LGraphNode.prototype[i] == null && i.substr(0,2) != "on" && i[0] != "_")
					node.trace(" + " + i);
			}
		}
		else
		{
			try
			{
				eval("var _foo = function() { return ("+e.target.value+"); }");
				var result = _foo.call(node);
				if(result)
					node.trace(result.toString());
				delete window._foo;
			}
			catch(err)
			{
				node.trace("error: " + err, "#A33");
			}
		}

		this.value = "";
	});
}
*/

/**
* marks as dirty the canvas, this way it will be rendered again
*
* @class LGraphCanvas
* @method setDirty
* @param {bool} fgcanvas if the foreground canvas is dirty (the one containing the nodes)
* @param {bool} bgcanvas if the background canvas is dirty (the one containing the wires)
*/
LGraphCanvas.prototype.setDirty = function(fgcanvas,bgcanvas)
{
	if(fgcanvas)
		this.dirty_canvas = true;
	if(bgcanvas)
		this.dirty_bgcanvas = true;
}

/**
* Used to attach the canvas in a popup
*
* @method getCanvasWindow
* @return {window} returns the window where the canvas is attached (the DOM root node)
*/
LGraphCanvas.prototype.getCanvasWindow = function()
{
	if(!this.canvas)
		return window;
	var doc = this.canvas.ownerDocument;
	return doc.defaultView || doc.parentWindow;
}

/**
* starts rendering the content of the canvas when needed
*
* @method startRendering
*/
LGraphCanvas.prototype.startRendering = function()
{
	if(this.is_rendering)
		return; //already rendering

	this.is_rendering = true;
	renderFrame.call(this);

	function renderFrame()
	{
		if(!this.pause_rendering)
			this.draw();

		var window = this.getCanvasWindow();
		if(this.is_rendering)
			window.requestAnimationFrame( renderFrame.bind(this) );
	}
}

/**
* stops rendering the content of the canvas (to save resources)
*
* @method stopRendering
*/
LGraphCanvas.prototype.stopRendering = function()
{
	this.is_rendering = false;
	/*
	if(this.rendering_timer_id)
	{
		clearInterval(this.rendering_timer_id);
		this.rendering_timer_id = null;
	}
	*/
}

/* LiteGraphCanvas input */

LGraphCanvas.prototype.processMouseDown = function(e)
{
	if(!this.graph)
		return;

	this.adjustMouseEvent(e);

	var ref_window = this.getCanvasWindow();
	var document = ref_window.document;
	LGraphCanvas.active_canvas = this;

	//move mouse move event to the window in case it drags outside of the canvas
	this.canvas.removeEventListener("mousemove", this._mousemove_callback );
	ref_window.document.addEventListener("mousemove", this._mousemove_callback, true ); //catch for the entire window
	ref_window.document.addEventListener("mouseup", this._mouseup_callback, true );

	var n = this.graph.getNodeOnPos( e.canvasX, e.canvasY, this.visible_nodes );
	var skip_dragging = false;

    LiteGraph.closeAllContextMenus( ref_window );

	if(e.which == 1) //left button mouse
	{
		if(!e.shiftKey) //REFACTOR: integrate with function
		{
            //no node or another node selected
            if (!n || !this.selected_nodes[n.id]) {

                var todeselect = [];
                for (var i in this.selected_nodes)
                    if (this.selected_nodes[i] != n)
                        todeselect.push(this.selected_nodes[i]);
                //two passes to avoid problems modifying the container
                for (var i in todeselect)
                    this.processNodeDeselected(todeselect[i]);
            }
		}
		var clicking_canvas_bg = false;

		//when clicked on top of a node
		//and it is not interactive
		if(n && this.allow_interaction )
		{
			if(!this.live_mode && !n.flags.pinned)
				this.bringToFront(n); //if it wasnt selected?
			var skip_action = false;

			//not dragging mouse to connect two slots
			if(!this.connecting_node && !n.flags.collapsed && !this.live_mode)
			{
				//search for outputs
				if(n.outputs)
					for(var i = 0, l = n.outputs.length; i < l; ++i)
					{
						var output = n.outputs[i];
						var link_pos = n.getConnectionPos(false,i);
						if( isInsideRectangle(e.canvasX, e.canvasY, link_pos[0] - 10, link_pos[1] - 5, 20,10) )
						{
							this.connecting_node = n;
							this.connecting_output = output;
							this.connecting_pos = n.getConnectionPos(false,i);
							this.connecting_slot = i;

							skip_action = true;
							break;
						}
					}

				//search for inputs
				if(n.inputs)
					for(var i = 0, l = n.inputs.length; i < l; ++i)
					{
						var input = n.inputs[i];
						var link_pos = n.getConnectionPos(true,i);
						if( isInsideRectangle(e.canvasX, e.canvasY, link_pos[0] - 10, link_pos[1] - 5, 20,10) )
						{
							if(input.link !== null)
							{
								n.disconnectInput(i);
								this.dirty_bgcanvas = true;
								skip_action = true;
							}
						}
					}

				//Search for corner
				if( !skip_action && isInsideRectangle(e.canvasX, e.canvasY, n.pos[0] + n.size[0] - 5, n.pos[1] + n.size[1] - 5 ,5,5 ))
				{
					this.resizing_node = n;
					this.canvas.style.cursor = "se-resize";
					skip_action = true;
				}
			}

			//Search for corner
			if( !skip_action && isInsideRectangle(e.canvasX, e.canvasY, n.pos[0], n.pos[1] - LiteGraph.NODE_TITLE_HEIGHT ,LiteGraph.NODE_TITLE_HEIGHT, LiteGraph.NODE_TITLE_HEIGHT ))
			{
				n.collapse();
				skip_action = true;
			}

			//it wasnt clicked on the links boxes
			if(!skip_action)
			{
				var block_drag_node = false;

				//double clicking
				var now = LiteGraph.getTime();
				if ((now - this.last_mouseclick) < 300 && this.selected_nodes[n.id])
				{
					//double click node
					if( n.onDblClick)
						n.onDblClick(e);
					this.processNodeDblClicked(n);
					block_drag_node = true;
				}

				//if do not capture mouse

				if( n.onMouseDown && n.onMouseDown(e, [e.canvasX - n.pos[0], e.canvasY - n.pos[1]] ) )
					block_drag_node = true;
				else if(this.live_mode)
				{
					clicking_canvas_bg = true;
					block_drag_node = true;
				}

				if(!block_drag_node)
				{
					if(this.allow_dragnodes)
						this.node_dragged = n;

					if(!this.selected_nodes[n.id])
						this.processNodeSelected(n,e);
				}

				this.dirty_canvas = true;
			}
		}
		else
			clicking_canvas_bg = true;

		if(clicking_canvas_bg && this.allow_dragcanvas)
		{
			this.dragging_canvas = true;
		}
	}
	else if (e.which == 2) //middle button
	{

	}
	else if (e.which == 3) //right button
	{
		this.processContextMenu(n,e);
	}

	//TODO
	//if(this.node_selected != prev_selected)
	//	this.onNodeSelectionChange(this.node_selected);

	this.last_mouse[0] = e.localX;
	this.last_mouse[1] = e.localY;
	this.last_mouseclick = LiteGraph.getTime();
	this.canvas_mouse = [e.canvasX, e.canvasY];

	/*
	if( (this.dirty_canvas || this.dirty_bgcanvas) && this.rendering_timer_id == null)
		this.draw();
	*/

	this.graph.change();

	//this is to ensure to defocus(blur) if a text input element is on focus
	if(!ref_window.document.activeElement || (ref_window.document.activeElement.nodeName.toLowerCase() != "input" && ref_window.document.activeElement.nodeName.toLowerCase() != "textarea"))
		e.preventDefault();
	e.stopPropagation();

	if(this.onMouseDown)
		this.onMouseDown(e);

	return false;
}

LGraphCanvas.prototype.processMouseMove = function(e)
{
	if(this.autoresize)
		this.resize();

	if(!this.graph)
		return;

	LGraphCanvas.active_canvas = this;
	this.adjustMouseEvent(e);
	var mouse = [e.localX, e.localY];
	var delta = [mouse[0] - this.last_mouse[0], mouse[1] - this.last_mouse[1]];
	this.last_mouse = mouse;
	this.canvas_mouse = [e.canvasX, e.canvasY];

	if(this.dragging_canvas)
	{
		this.offset[0] += delta[0] / this.scale;
		this.offset[1] += delta[1] / this.scale;
		this.dirty_canvas = true;
		this.dirty_bgcanvas = true;
	}
	else if(this.allow_interaction)
	{
		if(this.connecting_node)
			this.dirty_canvas = true;

		//get node over
		var n = this.graph.getNodeOnPos(e.canvasX, e.canvasY, this.visible_nodes);

		//remove mouseover flag
		for(var i = 0, l = this.graph._nodes.length; i < l; ++i)
		{
			if(this.graph._nodes[i].mouseOver && n != this.graph._nodes[i])
			{
				//mouse leave
				this.graph._nodes[i].mouseOver = false;
				if(this.node_over && this.node_over.onMouseLeave)
					this.node_over.onMouseLeave(e);
				this.node_over = null;
				this.dirty_canvas = true;
			}
		}

		//mouse over a node
		if(n)
		{
			//this.canvas.style.cursor = "move";
			if(!n.mouseOver)
			{
				//mouse enter
				n.mouseOver = true;
				this.node_over = n;
				this.dirty_canvas = true;

				if(n.onMouseEnter) n.onMouseEnter(e);
			}

			if(n.onMouseMove) n.onMouseMove(e);

			//on top of input
			if(this.connecting_node)
			{
				var pos = this._highlight_input || [0,0]; //to store the output of isOverNodeInput

				if( this.isOverNodeBox( n, e.canvasX, e.canvasY ) )
				{
					//mouse on top of the corner box, dont know what to do
				}
				else
				{
					var slot = this.isOverNodeInput( n, e.canvasX, e.canvasY, pos );
					if(slot != -1 && n.inputs[slot])
					{
						var slot_type = n.inputs[slot].type;
						if( LiteGraph.isValidConnection( this.connecting_output.type, slot_type ) )
							this._highlight_input = pos;
					}
					else
						this._highlight_input = null;
				}
			}

			//Search for corner
			if( isInsideRectangle(e.canvasX, e.canvasY, n.pos[0] + n.size[0] - 5, n.pos[1] + n.size[1] - 5 ,5,5 ))
				this.canvas.style.cursor = "se-resize";
			else
				this.canvas.style.cursor = null;
		}
		else
			this.canvas.style.cursor = null;

		if(this.node_capturing_input && this.node_capturing_input != n && this.node_capturing_input.onMouseMove)
		{
			this.node_capturing_input.onMouseMove(e);
		}


		if(this.node_dragged && !this.live_mode)
		{
			/*
			this.node_dragged.pos[0] += delta[0] / this.scale;
			this.node_dragged.pos[1] += delta[1] / this.scale;
			this.node_dragged.pos[0] = Math.round(this.node_dragged.pos[0]);
			this.node_dragged.pos[1] = Math.round(this.node_dragged.pos[1]);
			*/

			for(var i in this.selected_nodes)
			{
				var n = this.selected_nodes[i];

				n.pos[0] += delta[0] / this.scale;
				n.pos[1] += delta[1] / this.scale;
				//n.pos[0] = Math.round(n.pos[0]);
				//n.pos[1] = Math.round(n.pos[1]);
			}

			this.dirty_canvas = true;
			this.dirty_bgcanvas = true;
		}

		if(this.resizing_node && !this.live_mode)
		{
			this.resizing_node.size[0] += delta[0] / this.scale;
			this.resizing_node.size[1] += delta[1] / this.scale;
			var max_slots = Math.max( this.resizing_node.inputs ? this.resizing_node.inputs.length : 0, this.resizing_node.outputs ? this.resizing_node.outputs.length : 0);
			if(this.resizing_node.size[1] < max_slots * LiteGraph.NODE_SLOT_HEIGHT + 4)
				this.resizing_node.size[1] = max_slots * LiteGraph.NODE_SLOT_HEIGHT + 4;
			if(this.resizing_node.size[0] < LiteGraph.NODE_MIN_WIDTH)
				this.resizing_node.size[0] = LiteGraph.NODE_MIN_WIDTH;

			this.canvas.style.cursor = "se-resize";
			this.dirty_canvas = true;
			this.dirty_bgcanvas = true;
		}
	}

	/*
	if((this.dirty_canvas || this.dirty_bgcanvas) && this.rendering_timer_id == null)
		this.draw();
	*/

	e.preventDefault();
	//e.stopPropagation();
	return false;
	//this is not really optimal
	//this.graph.change();
}

LGraphCanvas.prototype.processMouseUp = function(e)
{
	if(!this.graph)
		return;

	var window = this.getCanvasWindow();
	var document = window.document;
	LGraphCanvas.active_canvas = this;

	//restore the mousemove event back to the canvas
	document.removeEventListener("mousemove", this._mousemove_callback, true );
	this.canvas.addEventListener("mousemove", this._mousemove_callback, true);
	document.removeEventListener("mouseup", this._mouseup_callback, true );

	this.adjustMouseEvent(e);

	if (e.which == 1) //left button
	{
		//dragging a connection
		if(this.connecting_node)
		{
			this.dirty_canvas = true;
			this.dirty_bgcanvas = true;

			var node = this.graph.getNodeOnPos( e.canvasX, e.canvasY, this.visible_nodes );

			//node below mouse
			if(node)
			{
				if( this.connecting_output.type == LiteGraph.EVENT && this.isOverNodeBox( node, e.canvasX, e.canvasY ) )
				{
					this.connecting_node.connect( this.connecting_slot, node, LiteGraph.EVENT );
				}
				else
				{
					//slot below mouse? connect
					var slot = this.isOverNodeInput(node, e.canvasX, e.canvasY);
					if(slot != -1)
					{
						this.connecting_node.connect(this.connecting_slot, node, slot);
					}
					else
					{ //not on top of an input
						var input = node.getInputInfo(0);
						//auto connect
						if(this.connecting_output.type == LiteGraph.EVENT)
							this.connecting_node.connect( this.connecting_slot, node, LiteGraph.EVENT );
						else
							if(input && !input.link && input.type == this.connecting_output.type) //toLowerCase missing
								this.connecting_node.connect(this.connecting_slot, node, 0);
					}
				}
			}

			this.connecting_output = null;
			this.connecting_pos = null;
			this.connecting_node = null;
			this.connecting_slot = -1;

		}//not dragging connection
		else if(this.resizing_node)
		{
			this.dirty_canvas = true;
			this.dirty_bgcanvas = true;
			this.resizing_node = null;
		}
		else if(this.node_dragged) //node being dragged?
		{
			this.dirty_canvas = true;
			this.dirty_bgcanvas = true;
			this.node_dragged.pos[0] = Math.round(this.node_dragged.pos[0]);
			this.node_dragged.pos[1] = Math.round(this.node_dragged.pos[1]);
			if(this.graph.config.align_to_grid)
				this.node_dragged.alignToGrid();
			this.node_dragged = null;
		}
		else //no node being dragged
		{
			this.dirty_canvas = true;
			this.dragging_canvas = false;

			if( this.node_over && this.node_over.onMouseUp )
				this.node_over.onMouseUp(e, [e.canvasX - this.node_over.pos[0], e.canvasY - this.node_over.pos[1]] );
			if( this.node_capturing_input && this.node_capturing_input.onMouseUp )
				this.node_capturing_input.onMouseUp(e, [e.canvasX - this.node_capturing_input.pos[0], e.canvasY - this.node_capturing_input.pos[1]] );
		}
	}
	else if (e.which == 2) //middle button
	{
		//trace("middle");
		this.dirty_canvas = true;
		this.dragging_canvas = false;
	}
	else if (e.which == 3) //right button
	{
		//trace("right");
		this.dirty_canvas = true;
		this.dragging_canvas = false;
	}

	/*
	if((this.dirty_canvas || this.dirty_bgcanvas) && this.rendering_timer_id == null)
		this.draw();
	*/

	this.graph.change();

	e.stopPropagation();
	e.preventDefault();
	return false;
}


LGraphCanvas.prototype.processMouseWheel = function(e)
{
	if(!this.graph || !this.allow_dragcanvas)
		return;

	var delta = (e.wheelDeltaY != null ? e.wheelDeltaY : e.detail * -60);

	this.adjustMouseEvent(e);

	var zoom = this.scale;

	if (delta > 0)
		zoom *= 1.1;
	else if (delta < 0)
		zoom *= 1/(1.1);

	this.setZoom( zoom, [ e.localX, e.localY ] );

	/*
	if(this.rendering_timer_id == null)
		this.draw();
	*/

	this.graph.change();

	e.preventDefault();
	return false; // prevent default
}

LGraphCanvas.prototype.isOverNodeBox = function( node, canvasx, canvasy )
{
	var title_height = LiteGraph.NODE_TITLE_HEIGHT;
	if( isInsideRectangle( canvasx, canvasy, node.pos[0] + 2, node.pos[1] + 2 - title_height, title_height - 4,title_height - 4) )
		return true;
	return false;
}

LGraphCanvas.prototype.isOverNodeInput = function(node, canvasx, canvasy, slot_pos )
{
	if(node.inputs)
		for(var i = 0, l = node.inputs.length; i < l; ++i)
		{
			var input = node.inputs[i];
			var link_pos = node.getConnectionPos(true,i);
			if( isInsideRectangle(canvasx, canvasy, link_pos[0] - 10, link_pos[1] - 5, 20,10) )
			{
				if(slot_pos)
				{
					slot_pos[0] = link_pos[0];
					slot_pos[1] = link_pos[1];
				}
				return i;
			}
		}
	return -1;
}

LGraphCanvas.prototype.processKey = function(e)
{
	if(!this.graph)
		return;

	var block_default = false;

	if(e.type == "keydown")
	{
		//select all Control A
		if(e.keyCode == 65 && e.ctrlKey)
		{
			this.selectAllNodes();
			block_default = true;
		}

		//delete or backspace
		if(e.keyCode == 46 || e.keyCode == 8)
		{
			this.deleteSelectedNodes();
			block_default = true;
		}

		//collapse
		//...

		//TODO
		if(this.selected_nodes)
			for (var i in this.selected_nodes)
				if(this.selected_nodes[i].onKeyDown)
					this.selected_nodes[i].onKeyDown(e);
	}
	else if( e.type == "keyup" )
	{
		if(this.selected_nodes)
			for (var i in this.selected_nodes)
				if(this.selected_nodes[i].onKeyUp)
					this.selected_nodes[i].onKeyUp(e);
	}

	this.graph.change();

	if(block_default)
	{
		e.preventDefault();
		return false;
	}
}

LGraphCanvas.prototype.processDrop = function(e)
{
	e.preventDefault();
	this.adjustMouseEvent(e);


	var pos = [e.canvasX,e.canvasY];
	var node = this.graph.getNodeOnPos(pos[0],pos[1]);

	if(!node)
	{
		var r = null;
		if(this.onDropItem)
			r = this.onDropItem( event );
		if(!r)
			this.checkDropItem(e);
		return;
	}

	if( node.onDropFile || node.onDropData )
	{
		var files = e.dataTransfer.files;
		if(files && files.length)
		{
			for(var i=0; i < files.length; i++)
			{
				var file = e.dataTransfer.files[0];
				var filename = file.name;
				var ext = LGraphCanvas.getFileExtension( filename );
				//console.log(file);

				if(node.onDropFile)
					node.onDropFile(file);

				if(node.onDropData)
				{
					//prepare reader
					var reader = new FileReader();
					reader.onload = function (event) {
						//console.log(event.target);
						var data = event.target.result;
						node.onDropData( data, filename, file );
					};

					//read data
					var type = file.type.split("/")[0];
					if(type == "text" || type == "")
						reader.readAsText(file);
					else if (type == "image")
						reader.readAsDataURL(file);
					else
						reader.readAsArrayBuffer(file);
				}
			}
		}
	}

	if(node.onDropItem)
	{
		if( node.onDropItem( event ) )
			return true;
	}

	if(this.onDropItem)
		return this.onDropItem( event );

	return false;
}

//called if the graph doesnt have a default drop item behaviour
LGraphCanvas.prototype.checkDropItem = function(e)
{
	if(e.dataTransfer.files.length)
	{
		var file = e.dataTransfer.files[0];
		var ext = LGraphCanvas.getFileExtension( file.name ).toLowerCase();
		var nodetype = LiteGraph.node_types_by_file_extension[ext];
		if(nodetype)
		{
			var node = LiteGraph.createNode( nodetype.type );
			node.pos = [e.canvasX, e.canvasY];
			this.graph.add( node );
			if( node.onDropFile )
				node.onDropFile( file );
		}
	}
}


LGraphCanvas.prototype.processNodeSelected = function(n,e)
{
	n.selected = true;
	if (n.onSelected)
		n.onSelected();

	if(e && e.shiftKey) //add to selection
		this.selected_nodes[n.id] = n;
	else
	{
		this.selected_nodes = {};
		this.selected_nodes[ n.id ] = n;
	}

	this.dirty_canvas = true;

	if(this.onNodeSelected)
		this.onNodeSelected(n);

	//if(this.node_in_panel) this.showNodePanel(n);
}

LGraphCanvas.prototype.processNodeDeselected = function(n)
{
	n.selected = false;
	if(n.onDeselected)
		n.onDeselected();

	delete this.selected_nodes[n.id];

	if(this.onNodeDeselected)
		this.onNodeDeselected(n);

	this.dirty_canvas = true;
}

LGraphCanvas.prototype.processNodeDblClicked = function(n)
{
	if(this.onShowNodePanel)
		this.onShowNodePanel(n);

	if(this.onNodeDblClicked)
		this.onNodeDblClicked(n);

	this.setDirty(true);
}

LGraphCanvas.prototype.selectNode = function(node)
{
	this.deselectAllNodes();

	if(!node)
		return;

	if(!node.selected && node.onSelected)
		node.onSelected();
	node.selected = true;
	this.selected_nodes[ node.id ] = node;
	this.setDirty(true);
}

LGraphCanvas.prototype.selectAllNodes = function()
{
	for(var i = 0; i < this.graph._nodes.length; ++i)
	{
		var n = this.graph._nodes[i];
		if(!n.selected && n.onSelected)
			n.onSelected();
		n.selected = true;
		this.selected_nodes[this.graph._nodes[i].id] = n;
	}

	this.setDirty(true);
}

LGraphCanvas.prototype.deselectAllNodes = function()
{
	for(var i in this.selected_nodes)
	{
		var n = this.selected_nodes;
		if(n.onDeselected)
			n.onDeselected();
		n.selected = false;
	}
	this.selected_nodes = {};
	this.setDirty(true);
}

LGraphCanvas.prototype.deleteSelectedNodes = function()
{
	for(var i in this.selected_nodes)
	{
		var m = this.selected_nodes[i];
		//if(m == this.node_in_panel) this.showNodePanel(null);
		this.graph.remove(m);
	}
	this.selected_nodes = {};
	this.setDirty(true);
}

LGraphCanvas.prototype.centerOnNode = function(node)
{
	this.offset[0] = -node.pos[0] - node.size[0] * 0.5 + (this.canvas.width * 0.5 / this.scale);
	this.offset[1] = -node.pos[1] - node.size[1] * 0.5 + (this.canvas.height * 0.5 / this.scale);
	this.setDirty(true,true);
}

LGraphCanvas.prototype.adjustMouseEvent = function(e)
{
	var b = this.canvas.getBoundingClientRect();
	e.localX = e.pageX - b.left;
	e.localY = e.pageY - b.top;

	e.canvasX = e.localX / this.scale - this.offset[0];
	e.canvasY = e.localY / this.scale - this.offset[1];
}

LGraphCanvas.prototype.setZoom = function(value, zooming_center)
{
	if(!zooming_center)
		zooming_center = [this.canvas.width * 0.5,this.canvas.height * 0.5];

	var center = this.convertOffsetToCanvas( zooming_center );

	this.scale = value;

	if(this.scale > this.max_zoom)
		this.scale = this.max_zoom;
	else if(this.scale < this.min_zoom)
		this.scale = this.min_zoom;

	var new_center = this.convertOffsetToCanvas( zooming_center );
	var delta_offset = [new_center[0] - center[0], new_center[1] - center[1]];

	this.offset[0] += delta_offset[0];
	this.offset[1] += delta_offset[1];

	this.dirty_canvas = true;
	this.dirty_bgcanvas = true;
}

LGraphCanvas.prototype.convertOffsetToCanvas = function(pos)
{
	return [pos[0] / this.scale - this.offset[0], pos[1] / this.scale - this.offset[1]];
}

LGraphCanvas.prototype.convertCanvasToOffset = function(pos)
{
	return [(pos[0] + this.offset[0]) * this.scale,
		(pos[1] + this.offset[1]) * this.scale ];
}

LGraphCanvas.prototype.convertEventToCanvas = function(e)
{
	var rect = this.canvas.getClientRects()[0];
	return this.convertOffsetToCanvas([e.pageX - rect.left,e.pageY - rect.top]);
}

LGraphCanvas.prototype.bringToFront = function(n)
{
	var i = this.graph._nodes.indexOf(n);
	if(i == -1) return;

	this.graph._nodes.splice(i,1);
	this.graph._nodes.push(n);
}

LGraphCanvas.prototype.sendToBack = function(n)
{
	var i = this.graph._nodes.indexOf(n);
	if(i == -1) return;

	this.graph._nodes.splice(i,1);
	this.graph._nodes.unshift(n);
}

/* Interaction */



/* LGraphCanvas render */

LGraphCanvas.prototype.computeVisibleNodes = function()
{
	var visible_nodes = [];
	for(var i = 0, l = this.graph._nodes.length; i < l; ++i)
	{
		var n = this.graph._nodes[i];

		//skip rendering nodes in live mode
		if(this.live_mode && !n.onDrawBackground && !n.onDrawForeground)
			continue;

		if(!overlapBounding(this.visible_area, n.getBounding() ))
			continue; //out of the visible area

		visible_nodes.push(n);
	}
	return visible_nodes;
}

LGraphCanvas.prototype.draw = function(force_canvas, force_bgcanvas)
{
	if(!this.canvas)
		return;

	//fps counting
	var now = LiteGraph.getTime();
	this.render_time = (now - this.last_draw_time)*0.001;
	this.last_draw_time = now;

	if(this.graph)
	{
		var start = [-this.offset[0], -this.offset[1] ];
		var end = [start[0] + this.canvas.width / this.scale, start[1] + this.canvas.height / this.scale];
		this.visible_area = new Float32Array([start[0],start[1],end[0],end[1]]);
	}

	if(this.dirty_bgcanvas || force_bgcanvas || this.always_render_background || (this.graph && this.graph._last_trigger_time && (now - this.graph._last_trigger_time) < 1000) )
		this.drawBackCanvas();

	if(this.dirty_canvas || force_canvas)
		this.drawFrontCanvas();

	this.fps = this.render_time ? (1.0 / this.render_time) : 0;
	this.frame += 1;
}

LGraphCanvas.prototype.drawFrontCanvas = function()
{
	if(!this.ctx)
		this.ctx = this.bgcanvas.getContext("2d");
	var ctx = this.ctx;
	if(!ctx) //maybe is using webgl...
		return;

	if(ctx.start2D)
		ctx.start2D();

	var canvas = this.canvas;

	//reset in case of error
	ctx.restore();
	ctx.setTransform(1, 0, 0, 1, 0, 0);

	//clip dirty area if there is one, otherwise work in full canvas
	if(this.dirty_area)
	{
		ctx.save();
		ctx.beginPath();
		ctx.rect(this.dirty_area[0],this.dirty_area[1],this.dirty_area[2],this.dirty_area[3]);
		ctx.clip();
	}

	//clear
	//canvas.width = canvas.width;
	if(this.clear_background)
		ctx.clearRect(0,0,canvas.width, canvas.height);

	//draw bg canvas
	if(this.bgcanvas == this.canvas)
		this.drawBackCanvas();
	else
		ctx.drawImage(this.bgcanvas,0,0);

	//rendering
	if(this.onRender)
		this.onRender(canvas, ctx);

	//info widget
	if(this.show_info)
		this.renderInfo(ctx);

	if(this.graph)
	{
		//apply transformations
		ctx.save();
		ctx.scale(this.scale,this.scale);
		ctx.translate(this.offset[0],this.offset[1]);

		//draw nodes
		var drawn_nodes = 0;
		var visible_nodes = this.computeVisibleNodes();
		this.visible_nodes = visible_nodes;

		for (var i = 0; i < visible_nodes.length; ++i)
		{
			var node = visible_nodes[i];

			//transform coords system
			ctx.save();
			ctx.translate( node.pos[0], node.pos[1] );

			//Draw
			this.drawNode(node, ctx );
			drawn_nodes += 1;

			//Restore
			ctx.restore();
		}

		//connections ontop?
		if(this.graph.config.links_ontop)
			if(!this.live_mode)
				this.drawConnections(ctx);

		//current connection
		if(this.connecting_pos != null)
		{
			ctx.lineWidth = this.connections_width;
			var link_color = null;
			switch( this.connecting_output.type )
			{
				case LiteGraph.EVENT: link_color = "#F85"; break;
				default:
					link_color = "#AFA";
			}
			//the connection being dragged by the mouse
			this.renderLink( ctx, this.connecting_pos, [this.canvas_mouse[0],this.canvas_mouse[1]], null, false, null, link_color );

			ctx.beginPath();
				if( this.connecting_output.type === LiteGraph.EVENT )
					ctx.rect( (this.connecting_pos[0] - 6) + 0.5, (this.connecting_pos[1] - 5) + 0.5,14,10);
				else
					ctx.arc( this.connecting_pos[0], this.connecting_pos[1],4,0,Math.PI*2);
			ctx.fill();

			ctx.fillStyle = "#ffcc00";
			if(this._highlight_input)
			{
				ctx.beginPath();
					ctx.arc( this._highlight_input[0], this._highlight_input[1],6,0,Math.PI*2);
				ctx.fill();
			}
		}
		ctx.restore();
	}

	if(this.dirty_area)
	{
		ctx.restore();
		//this.dirty_area = null;
	}

	if(ctx.finish2D) //this is a function I use in webgl renderer
		ctx.finish2D();

	this.dirty_canvas = false;
}

LGraphCanvas.prototype.renderInfo = function( ctx, x, y )
{
	x = x || 0;
	y = y || 0;

	ctx.save();
	ctx.translate( x, y );

	ctx.font = "10px Arial";
	ctx.fillStyle = "#888";
	if(this.graph)
	{
		ctx.fillText( "T: " + this.graph.globaltime.toFixed(2)+"s",5,13*1 );
		ctx.fillText( "I: " + this.graph.iteration,5,13*2 );
		ctx.fillText( "F: " + this.frame,5,13*3 );
		ctx.fillText( "FPS:" + this.fps.toFixed(2),5,13*4 );
	}
	else
		ctx.fillText( "No graph selected",5,13*1 );
	ctx.restore();
}

LGraphCanvas.prototype.drawBackCanvas = function()
{
	var canvas = this.bgcanvas;
	if(canvas.width != this.canvas.width ||
		canvas.height != this.canvas.height)
	{
		canvas.width = this.canvas.width;
		canvas.height = this.canvas.height;
	}

	if(!this.bgctx)
		this.bgctx = this.bgcanvas.getContext("2d");
	var ctx = this.bgctx;
	if(ctx.start)
		ctx.start();

	//clear
	if(this.clear_background)
		ctx.clearRect(0,0,canvas.width, canvas.height);

	//reset in case of error
	ctx.restore();
	ctx.setTransform(1, 0, 0, 1, 0, 0);

	if(this.graph)
	{
		//apply transformations
		ctx.save();
		ctx.scale(this.scale,this.scale);
		ctx.translate(this.offset[0],this.offset[1]);

		//render BG
		if(this.background_image && this.scale > 0.5)
		{
			ctx.globalAlpha = (1.0 - 0.5 / this.scale) * this.editor_alpha;
			ctx.imageSmoothingEnabled = ctx.mozImageSmoothingEnabled = ctx.imageSmoothingEnabled = false;
			if(!this._bg_img || this._bg_img.name != this.background_image)
			{
				this._bg_img = new Image();
				this._bg_img.name = this.background_image;
				this._bg_img.src = this.background_image;
				var that = this;
				this._bg_img.onload = function() {
					that.draw(true,true);
				}
			}

			var pattern = null;
			if(this._pattern == null && this._bg_img.width > 0)
			{
				pattern = ctx.createPattern( this._bg_img, 'repeat' );
				this._pattern_img = this._bg_img;
				this._pattern = pattern;
			}
			else
				pattern = this._pattern;
			if(pattern)
			{
				ctx.fillStyle = pattern;
				ctx.fillRect(this.visible_area[0],this.visible_area[1],this.visible_area[2]-this.visible_area[0],this.visible_area[3]-this.visible_area[1]);
				ctx.fillStyle = "transparent";
			}

			ctx.globalAlpha = 1.0;
			ctx.imageSmoothingEnabled = ctx.mozImageSmoothingEnabled = ctx.imageSmoothingEnabled = true;
		}

		if(this.onBackgroundRender)
			this.onBackgroundRender(canvas, ctx);

		//DEBUG: show clipping area
		//ctx.fillStyle = "red";
		//ctx.fillRect( this.visible_area[0] + 10, this.visible_area[1] + 10, this.visible_area[2] - this.visible_area[0] - 20, this.visible_area[3] - this.visible_area[1] - 20);

		//bg
		ctx.strokeStyle = "#235";
		ctx.strokeRect(0,0,canvas.width,canvas.height);

		if(this.render_connections_shadows)
		{
			ctx.shadowColor = "#000";
			ctx.shadowOffsetX = 0;
			ctx.shadowOffsetY = 0;
			ctx.shadowBlur = 6;
		}
		else
			ctx.shadowColor = "rgba(0,0,0,0)";

		//draw connections
		if(!this.live_mode)
			this.drawConnections(ctx);

		ctx.shadowColor = "rgba(0,0,0,0)";

		//restore state
		ctx.restore();
	}

	if(ctx.finish)
		ctx.finish();

	this.dirty_bgcanvas = false;
	this.dirty_canvas = true; //to force to repaint the front canvas with the bgcanvas
}

/* Renders the LGraphNode on the canvas */
LGraphCanvas.prototype.drawNode = function(node, ctx )
{
	var glow = false;

	var color = node.color || LiteGraph.NODE_DEFAULT_COLOR;
	//if (this.selected) color = "#88F";

	var render_title = true;
	if(node.flags.skip_title_render || node.graph.isLive())
		render_title = false;
	if(node.mouseOver)
		render_title = true;

	//shadow and glow
	if (node.mouseOver) glow = true;

	if(node.selected)
	{
		/*
		ctx.shadowColor = "#EEEEFF";//glow ? "#AAF" : "#000";
		ctx.shadowOffsetX = 0;
		ctx.shadowOffsetY = 0;
		ctx.shadowBlur = 1;
		*/
	}
	else if(this.render_shadows)
	{
		ctx.shadowColor = "rgba(0,0,0,0.5)";
		ctx.shadowOffsetX = 2;
		ctx.shadowOffsetY = 2;
		ctx.shadowBlur = 3;
	}
	else
		ctx.shadowColor = "transparent";

	//only render if it forces it to do it
	if(this.live_mode)
	{
		if(!node.flags.collapsed)
		{
			ctx.shadowColor = "transparent";
			//if(node.onDrawBackground)
			//	node.onDrawBackground(ctx);
			if(node.onDrawForeground)
				node.onDrawForeground(ctx);
		}

		return;
	}

	//draw in collapsed form
	/*
	if(node.flags.collapsed)
	{
		if(!node.onDrawCollapsed || node.onDrawCollapsed(ctx) == false)
			this.drawNodeCollapsed(node, ctx, color, node.bgcolor);
		return;
	}
	*/

	var editor_alpha = this.editor_alpha;
	ctx.globalAlpha = editor_alpha;

	//clip if required (mask)
	var shape = node.shape || "box";
	var size = new Float32Array(node.size);
	if(node.flags.collapsed)
	{
		size[0] = LiteGraph.NODE_COLLAPSED_WIDTH;
		size[1] = 0;
	}

	//Start clipping
	if(node.flags.clip_area)
	{
		ctx.save();
		if(shape == "box")
		{
			ctx.beginPath();
			ctx.rect(0,0,size[0], size[1]);
		}
		else if (shape == "round")
		{
			ctx.roundRect(0,0,size[0], size[1],10);
		}
		else if (shape == "circle")
		{
			ctx.beginPath();
			ctx.arc(size[0] * 0.5, size[1] * 0.5, size[0] * 0.5, 0, Math.PI*2);
		}
		ctx.clip();
	}

	//draw shape
	this.drawNodeShape(node, ctx, size, color, node.bgcolor, !render_title, node.selected );
	ctx.shadowColor = "transparent";

	//connection slots
	ctx.textAlign = "left";
	ctx.font = this.inner_text_font;

	var render_text = this.scale > 0.6;

	var out_slot = this.connecting_output;

	//render inputs and outputs
	if(!node.flags.collapsed)
	{
		//input connection slots
		if(node.inputs)
			for(var i = 0; i < node.inputs.length; i++)
			{
				var slot = node.inputs[i];

				ctx.globalAlpha = editor_alpha;
				//change opacity of incompatible slots
				if ( this.connecting_node && LiteGraph.isValidConnection( slot.type && out_slot.type ) )
					ctx.globalAlpha = 0.4 * editor_alpha;

				ctx.fillStyle = slot.link != null ? "#7F7" : "#AAA";

				var pos = node.getConnectionPos(true,i);
				pos[0] -= node.pos[0];
				pos[1] -= node.pos[1];

				ctx.beginPath();

				if (slot.type === LiteGraph.EVENT)
					ctx.rect((pos[0] - 6) + 0.5, (pos[1] - 5) + 0.5,14,10);
				else
					ctx.arc(pos[0],pos[1],4,0,Math.PI*2);

				ctx.fill();

				//render name
				if(render_text)
				{
					var text = slot.label != null ? slot.label : slot.name;
					if(text)
					{
						ctx.fillStyle = color;
						ctx.fillText(text,pos[0] + 10,pos[1] + 5);
					}
				}
			}

		//output connection slots
		if(this.connecting_node)
			ctx.globalAlpha = 0.4 * editor_alpha;

		ctx.lineWidth = 1;

		ctx.textAlign = "right";
		ctx.strokeStyle = "black";
		if(node.outputs)
			for(var i = 0; i < node.outputs.length; i++)
			{
				var slot = node.outputs[i];

				var pos = node.getConnectionPos(false,i);
				pos[0] -= node.pos[0];
				pos[1] -= node.pos[1];

				ctx.fillStyle = slot.links && slot.links.length ? "#7F7" : "#AAA";
				ctx.beginPath();
				//ctx.rect( node.size[0] - 14,i*14,10,10);

				if (slot.type === LiteGraph.EVENT)
					ctx.rect((pos[0] - 6) + 0.5,(pos[1] - 5) + 0.5,14,10);
				else
					ctx.arc( pos[0],pos[1],4,0, Math.PI*2 );

				//trigger
				//if(slot.node_id != null && slot.slot == -1)
				//	ctx.fillStyle = "#F85";

				//if(slot.links != null && slot.links.length)
				ctx.fill();
				ctx.stroke();

				//render output name
				if(render_text)
				{
					var text = slot.label != null ? slot.label : slot.name;
					if(text)
					{
						ctx.fillStyle = color;
						ctx.fillText(text, pos[0] - 10,pos[1] + 5);
					}
				}
			}

		ctx.textAlign = "left";
		ctx.globalAlpha = 1;

		if(node.onDrawForeground)
			node.onDrawForeground(ctx);
	}//!collapsed

	if(node.flags.clip_area)
		ctx.restore();

	ctx.globalAlpha = 1.0;
}

/* Renders the node shape */
LGraphCanvas.prototype.drawNodeShape = function(node, ctx, size, fgcolor, bgcolor, no_title, selected )
{
	//bg rect
	ctx.strokeStyle = fgcolor || LiteGraph.NODE_DEFAULT_COLOR;
	ctx.fillStyle = bgcolor || LiteGraph.NODE_DEFAULT_BGCOLOR;

	/* gradient test
	var grad = ctx.createLinearGradient(0,0,0,node.size[1]);
	grad.addColorStop(0, "#AAA");
	grad.addColorStop(0.5, fgcolor || LiteGraph.NODE_DEFAULT_COLOR);
	grad.addColorStop(1, bgcolor || LiteGraph.NODE_DEFAULT_BGCOLOR);
	ctx.fillStyle = grad;
	//*/

	var title_height = LiteGraph.NODE_TITLE_HEIGHT;

	//render depending on shape
	var shape = node.shape || "box";
	if(shape == "box")
	{
		ctx.beginPath();
		ctx.rect(0,no_title ? 0 : -title_height, size[0]+1, no_title ? size[1] : size[1] + title_height);
		ctx.fill();
		ctx.shadowColor = "transparent";

		if(selected)
		{
			ctx.strokeStyle = "#CCC";
			ctx.strokeRect(-0.5,no_title ? -0.5 : -title_height + -0.5, size[0]+2, no_title ? (size[1]+2) : (size[1] + title_height+2) - 1);
			ctx.strokeStyle = fgcolor;
		}
	}
	else if (node.shape == "round")
	{
		ctx.roundRect(0,no_title ? 0 : -title_height,size[0], no_title ? size[1] : size[1] + title_height, 10);
		ctx.fill();
	}
	else if (node.shape == "circle")
	{
		ctx.beginPath();
		ctx.arc(size[0] * 0.5, size[1] * 0.5, size[0] * 0.5, 0, Math.PI*2);
		ctx.fill();
	}

	ctx.shadowColor = "transparent";

	//ctx.stroke();

	//image
	if (node.bgImage && node.bgImage.width)
		ctx.drawImage( node.bgImage, (size[0] - node.bgImage.width) * 0.5 , (size[1] - node.bgImage.height) * 0.5);

	if(node.bgImageUrl && !node.bgImage)
		node.bgImage = node.loadImage(node.bgImageUrl);

	if(node.onDrawBackground)
		node.onDrawBackground(ctx);

	//title bg (remember, it is rendered ABOVE the node
	if(!no_title)
	{
		ctx.fillStyle = fgcolor || LiteGraph.NODE_DEFAULT_COLOR;
		var old_alpha = ctx.globalAlpha;
		ctx.globalAlpha = 0.5 * old_alpha;
		if(shape == "box")
		{
			ctx.beginPath();
			ctx.rect(0, -title_height, size[0]+1, title_height);
			ctx.fill()
			//ctx.stroke();
		}
		else if (shape == "round")
		{
			ctx.roundRect(0,-title_height,size[0], title_height,10,0);
			//ctx.fillRect(0,8,size[0],NODE_TITLE_HEIGHT - 12);
			ctx.fill();
			//ctx.stroke();
		}

		//title box
		ctx.fillStyle = node.boxcolor || LiteGraph.NODE_DEFAULT_BOXCOLOR;
		ctx.beginPath();
		if (shape == "round")
			ctx.arc(title_height *0.5, title_height * -0.5, (title_height - 6) *0.5,0,Math.PI*2);
		else
			ctx.rect(3,-title_height + 3,title_height - 6,title_height - 6);
		ctx.fill();
		ctx.globalAlpha = old_alpha;

		//title text
		ctx.font = this.title_text_font;
		var title = node.getTitle();
		if(title && this.scale > 0.5)
		{
			ctx.fillStyle = LiteGraph.NODE_TITLE_COLOR;
			ctx.fillText( title, 16, 13 - title_height );
		}
	}
}

/* Renders the node when collapsed */
LGraphCanvas.prototype.drawNodeCollapsed = function(node, ctx, fgcolor, bgcolor)
{
	//draw default collapsed shape
	ctx.strokeStyle = fgcolor || LiteGraph.NODE_DEFAULT_COLOR;
	ctx.fillStyle = bgcolor || LiteGraph.NODE_DEFAULT_BGCOLOR;

	var collapsed_radius = LiteGraph.NODE_COLLAPSED_RADIUS;

	//circle shape
	var shape = node.shape || "box";
	if(shape == "circle")
	{
		ctx.beginPath();
		ctx.arc(node.size[0] * 0.5, node.size[1] * 0.5, collapsed_radius,0,Math.PI * 2);
		ctx.fill();
		ctx.shadowColor = "rgba(0,0,0,0)";
		ctx.stroke();

		ctx.fillStyle = node.boxcolor || LiteGraph.NODE_DEFAULT_BOXCOLOR;
		ctx.beginPath();
		ctx.arc(node.size[0] * 0.5, node.size[1] * 0.5, collapsed_radius * 0.5,0,Math.PI * 2);
		ctx.fill();
	}
	else if(shape == "round") //rounded box
	{
		ctx.beginPath();
		ctx.roundRect(node.size[0] * 0.5 - collapsed_radius, node.size[1] * 0.5 - collapsed_radius, 2*collapsed_radius,2*collapsed_radius,5);
		ctx.fill();
		ctx.shadowColor = "rgba(0,0,0,0)";
		ctx.stroke();

		ctx.fillStyle = node.boxcolor || LiteGraph.NODE_DEFAULT_BOXCOLOR;
		ctx.beginPath();
		ctx.roundRect(node.size[0] * 0.5 - collapsed_radius*0.5, node.size[1] * 0.5 - collapsed_radius*0.5, collapsed_radius,collapsed_radius,2);
		ctx.fill();
	}
	else //flat box
	{
		ctx.beginPath();
		//ctx.rect(node.size[0] * 0.5 - collapsed_radius, node.size[1] * 0.5 - collapsed_radius, 2*collapsed_radius, 2*collapsed_radius);
		ctx.rect(0, 0, node.size[0], collapsed_radius * 2 );
		ctx.fill();
		ctx.shadowColor = "rgba(0,0,0,0)";
		ctx.stroke();

		ctx.fillStyle = node.boxcolor || LiteGraph.NODE_DEFAULT_BOXCOLOR;
		ctx.beginPath();
		//ctx.rect(node.size[0] * 0.5 - collapsed_radius*0.5, node.size[1] * 0.5 - collapsed_radius*0.5, collapsed_radius,collapsed_radius);
		ctx.rect(collapsed_radius*0.5, collapsed_radius*0.5, collapsed_radius, collapsed_radius);
		ctx.fill();
	}
}

//OPTIMIZE THIS: precatch connections position instead of recomputing them every time
LGraphCanvas.prototype.drawConnections = function(ctx)
{
	var now = LiteGraph.getTime();

	//draw connections
	ctx.lineWidth = this.connections_width;

	ctx.fillStyle = "#AAA";
	ctx.strokeStyle = "#AAA";
	ctx.globalAlpha = this.editor_alpha;
	//for every node
	for (var n = 0, l = this.graph._nodes.length; n < l; ++n)
	{
		var node = this.graph._nodes[n];
		//for every input (we render just inputs because it is easier as every slot can only have one input)
		if(node.inputs && node.inputs.length)
			for(var i = 0; i < node.inputs.length; ++i)
			{
				var input = node.inputs[i];
				if(!input || input.link == null)
					continue;
				var link_id = input.link;
				var link = this.graph.links[ link_id ];
				if(!link)
					continue;

				var start_node = this.graph.getNodeById( link.origin_id );
				if(start_node == null) continue;
				var start_node_slot = link.origin_slot;
				var start_node_slotpos = null;

				if(start_node_slot == -1)
					start_node_slotpos = [start_node.pos[0] + 10, start_node.pos[1] + 10];
				else
					start_node_slotpos = start_node.getConnectionPos(false, start_node_slot);

				this.renderLink( ctx, start_node_slotpos, node.getConnectionPos(true,i), link );

				//event triggered rendered on top
				if(link && link._last_time && (now - link._last_time) < 1000 )
				{
					var f = 2.0 - (now - link._last_time) * 0.002;
					var color = "rgba(255,255,255, " + f.toFixed(2) + ")";
					this.renderLink( ctx, start_node_slotpos, node.getConnectionPos(true,i), link, true, f, color );
				}
			}
	}
	ctx.globalAlpha = 1;
}

LGraphCanvas.prototype.renderLink = function( ctx, a, b, link, skip_border, flow, color )
{
	if(!this.highquality_render)
	{
		ctx.beginPath();
		ctx.moveTo(a[0],a[1]);
		ctx.lineTo(b[0],b[1]);
		ctx.stroke();
		return;
	}

	var dist = distance(a,b);

	if(this.render_connections_border && this.scale > 0.6)
		ctx.lineWidth = this.connections_width + 4;

	//choose color
	if( !color && link )
		color = LGraphCanvas.link_type_colors[ link.type ];
	if(!color)
		color = this.default_link_color;

	//begin line shape
	ctx.beginPath();

	if(this.render_curved_connections) //splines
	{
		ctx.moveTo(a[0],a[1]);
		ctx.bezierCurveTo(a[0] + dist*0.25, a[1],
							b[0] - dist*0.25 , b[1],
							b[0] ,b[1] );
	}
	else //lines
	{
		ctx.moveTo(a[0]+10,a[1]);
		ctx.lineTo(((a[0]+10) + (b[0]-10))*0.5,a[1]);
		ctx.lineTo(((a[0]+10) + (b[0]-10))*0.5,b[1]);
		ctx.lineTo(b[0]-10,b[1]);
	}

	//rendering the outline of the connection can be a little bit slow
	if(this.render_connections_border && this.scale > 0.6 && !skip_border)
	{
		ctx.strokeStyle = "rgba(0,0,0,0.5)";
		ctx.stroke();
	}

	ctx.lineWidth = this.connections_width;
	ctx.fillStyle = ctx.strokeStyle = color;
	ctx.stroke();
	//end line shape

	//render arrow in the middle
	if( this.render_connection_arrows && this.scale >= 0.6 )
	{
		//render arrow
		if(this.render_connection_arrows && this.scale > 0.6)
		{
			//compute two points in the connection
			var pos = this.computeConnectionPoint(a,b,0.5);
			var pos2 = this.computeConnectionPoint(a,b,0.51);

			//compute the angle between them so the arrow points in the right direction
			var angle = 0;
			if(this.render_curved_connections)
				angle = -Math.atan2( pos2[0] - pos[0], pos2[1] - pos[1]);
			else
				angle = b[1] > a[1] ? 0 : Math.PI;

			//render arrow
			ctx.save();
			ctx.translate(pos[0],pos[1]);
			ctx.rotate(angle);
			ctx.beginPath();
			ctx.moveTo(-5,-5);
			ctx.lineTo(0,+5);
			ctx.lineTo(+5,-5);
			ctx.fill();
			ctx.restore();
		}
	}

	//render flowing points
	if(flow)
	{
		for(var i = 0; i < 5; ++i)
		{
			var f = (LiteGraph.getTime() * 0.001 + (i * 0.2)) % 1;
			var pos = this.computeConnectionPoint(a,b,f);
			ctx.beginPath();
			ctx.arc(pos[0],pos[1],5,0,2*Math.PI);
			ctx.fill();
		}
	}
}

LGraphCanvas.prototype.computeConnectionPoint = function(a,b,t)
{
	var dist = distance(a,b);
	var p0 = a;
	var p1 = [ a[0] + dist*0.25, a[1] ];
	var p2 = [ b[0] - dist*0.25, b[1] ];
	var p3 = b;

	var c1 = (1-t)*(1-t)*(1-t);
	var c2 = 3*((1-t)*(1-t))*t;
	var c3 = 3*(1-t)*(t*t);
	var c4 = t*t*t;

	var x = c1*p0[0] + c2*p1[0] + c3*p2[0] + c4*p3[0];
	var y = c1*p0[1] + c2*p1[1] + c3*p2[1] + c4*p3[1];
	return [x,y];
}

/*
LGraphCanvas.prototype.resizeCanvas = function(width,height)
{
	this.canvas.width = width;
	if(height)
		this.canvas.height = height;

	this.bgcanvas.width = this.canvas.width;
	this.bgcanvas.height = this.canvas.height;
	this.draw(true,true);
}
*/

LGraphCanvas.prototype.resize = function(width, height)
{
	if(!width && !height)
	{
		var parent = this.canvas.parentNode;
		width = parent.offsetWidth;
		height = parent.offsetHeight;
	}

	if(this.canvas.width == width && this.canvas.height == height)
		return;

	this.canvas.width = width;
	this.canvas.height = height;
	this.bgcanvas.width = this.canvas.width;
	this.bgcanvas.height = this.canvas.height;
	this.setDirty(true,true);
}


LGraphCanvas.prototype.switchLiveMode = function(transition)
{
	if(!transition)
	{
		this.live_mode = !this.live_mode;
		this.dirty_canvas = true;
		this.dirty_bgcanvas = true;
		return;
	}

	var self = this;
	var delta = this.live_mode ? 1.1 : 0.9;
	if(this.live_mode)
	{
		this.live_mode = false;
		this.editor_alpha = 0.1;
	}

	var t = setInterval(function() {
		self.editor_alpha *= delta;
		self.dirty_canvas = true;
		self.dirty_bgcanvas = true;

		if(delta < 1  && self.editor_alpha < 0.01)
		{
			clearInterval(t);
			if(delta < 1)
				self.live_mode = true;
		}
		if(delta > 1 && self.editor_alpha > 0.99)
		{
			clearInterval(t);
			self.editor_alpha = 1;
		}
	},1);
}

LGraphCanvas.prototype.onNodeSelectionChange = function(node)
{
	return; //disabled
	//if(this.node_in_panel) this.showNodePanel(node);
}

LGraphCanvas.prototype.touchHandler = function(event)
{
	//alert("foo");
    var touches = event.changedTouches,
        first = touches[0],
        type = "";

         switch(event.type)
    {
        case "touchstart": type = "mousedown"; break;
        case "touchmove":  type="mousemove"; break;
        case "touchend":   type="mouseup"; break;
        default: return;
    }

             //initMouseEvent(type, canBubble, cancelable, view, clickCount,
    //           screenX, screenY, clientX, clientY, ctrlKey,
    //           altKey, shiftKey, metaKey, button, relatedTarget);

	var window = this.getCanvasWindow();
	var document = window.document;

    var simulatedEvent = document.createEvent("MouseEvent");
    simulatedEvent.initMouseEvent(type, true, true, window, 1,
                              first.screenX, first.screenY,
                              first.clientX, first.clientY, false,
                              false, false, false, 0/*left*/, null);
	first.target.dispatchEvent(simulatedEvent);
    event.preventDefault();
}

/* CONTEXT MENU ********************/

LGraphCanvas.onMenuAdd = function( node, options, e, prev_menu )
{
	var canvas = LGraphCanvas.active_canvas;
	var ref_window = canvas.getCanvasWindow();

	var values = LiteGraph.getNodeTypesCategories();
	var entries = [];
	for(var i in values)
		if(values[i])
			entries.push({ value: values[i], content: values[i], has_submenu: true });

	var menu = new LiteGraph.ContextMenu( entries, { event: e, callback: inner_clicked, parentMenu: prev_menu }, ref_window);

	function inner_clicked( v, option, e )
	{
		var category = v.value;
		var node_types = LiteGraph.getNodeTypesInCategory(category);
		var values = [];
		for(var i in node_types)
			values.push( { content: node_types[i].title, value: node_types[i].type });

		new LiteGraph.ContextMenu( values, {event: e, callback: inner_create, parentMenu: menu }, ref_window);
		return false;
	}

	function inner_create( v, e )
	{
		var first_event = prev_menu.getFirstEvent();
		var node = LiteGraph.createNode( v.value );
		if(node)
		{
			node.pos = canvas.convertEventToCanvas( first_event );
			canvas.graph.add( node );
		}
	}

	return false;
}

LGraphCanvas.onMenuCollapseAll = function()
{

}


LGraphCanvas.onMenuNodeEdit = function()
{

}

LGraphCanvas.showMenuNodeOptionalInputs = function( v, options, e, prev_menu, node )
{
	if(!node)
		return;

	var that = this;
	var canvas = LGraphCanvas.active_canvas;
	var ref_window = canvas.getCanvasWindow();

	var options = node.optional_inputs;
	if(node.onGetInputs)
		options = node.onGetInputs();

	var entries = [];
	if(options)
		for (var i in options)
		{
			var entry = options[i];
			if(!entry)
			{
				entries.push(null);
				continue;
			}
			var label = entry[0];
			if(entry[2] && entry[2].label)
				label = entry[2].label;
			entries.push({content: label, value: entry});
		}

	if(this.onMenuNodeInputs)
		entries = this.onMenuNodeInputs( entries );

	if(!entries.length)
		return;

	var menu = new LiteGraph.ContextMenu(entries, { event: e, callback: inner_clicked, parentMenu: prev_menu, node: node }, ref_window);

	function inner_clicked(v, e, prev)
	{
		if(!node)
			return;

		if(v.callback)
			v.callback.call( that, node, v, e, prev );

		if(v.value)
		{
			node.addInput(v.value[0],v.value[1], v.value[2]);
			node.setDirtyCanvas(true,true);
		}
	}

	return false;
}

LGraphCanvas.showMenuNodeOptionalOutputs = function( v, options, e, prev_menu, node )
{
	if(!node)
		return;

	var that = this;
	var canvas = LGraphCanvas.active_canvas;
	var ref_window = canvas.getCanvasWindow();

	var options = node.optional_outputs;
	if(node.onGetOutputs)
		options = node.onGetOutputs();

	var entries = [];
	if(options)
		for (var i in options)
		{
			var entry = options[i];
			if(!entry) //separator?
			{
				entries.push(null);
				continue;
			}

			if(node.flags && node.flags.skip_repeated_outputs && node.findOutputSlot(entry[0]) != -1)
				continue; //skip the ones already on
			var label = entry[0];
			if(entry[2] && entry[2].label)
				label = entry[2].label;
			var data = {content: label, value: entry};
			if(entry[1] == LiteGraph.EVENT)
				data.className = "event";
			entries.push(data);
		}

	if(this.onMenuNodeOutputs)
		entries = this.onMenuNodeOutputs( entries );

	if(!entries.length)
		return;

	var menu = new LiteGraph.ContextMenu(entries, {event: e, callback: inner_clicked, parentMenu: prev_menu, node: node }, ref_window);

	function inner_clicked( v, e, prev )
	{
		if(!node)
			return;

		if(v.callback)
			v.callback.call( that, node, v, e, prev );

		if(!v.value)
			return;

		var value = v.value[1];

		if(value && (value.constructor === Object || value.constructor === Array)) //submenu why?
		{
			var entries = [];
			for(var i in value)
				entries.push({ content: i, value: value[i]});
			new LiteGraph.ContextMenu( entries, { event: e, callback: inner_clicked, parentMenu: prev_menu, node: node });
			return false;
		}
		else
		{
			node.addOutput( v.value[0], v.value[1], v.value[2]);
			node.setDirtyCanvas(true,true);
		}

	}

	return false;
}

LGraphCanvas.onShowMenuNodeProperties = function( value, options, e, prev_menu, node )
{
	if(!node || !node.properties)
		return;

	var that = this;
	var canvas = LGraphCanvas.active_canvas;
	var ref_window = canvas.getCanvasWindow();

	var entries = [];
		for (var i in node.properties)
		{
			var value = node.properties[i] !== undefined ? node.properties[i] : " ";
			//value could contain invalid html characters, clean that
			value = LGraphCanvas.decodeHTML(value);
			entries.push({content: "<span class='property_name'>" + i + "</span>" + "<span class='property_value'>" + value + "</span>", value: i});
		}
	if(!entries.length)
		return;

	var menu = new LiteGraph.ContextMenu(entries, {event: e, callback: inner_clicked, parentMenu: prev_menu, allow_html: true, node: node },ref_window);

	function inner_clicked( v, options, e, prev )
	{
		if(!node)
			return;
		var rect = this.getBoundingClientRect();
		canvas.showEditPropertyValue( node, v.value, { position: [rect.left, rect.top] });
	}

	return false;
}

LGraphCanvas.decodeHTML = function( str )
{
	var e = document.createElement("div");
	e.innerText = str;
	return e.innerHTML;
}

LGraphCanvas.onResizeNode = function( value, options, e, menu, node )
{
	if(!node)
		return;
	node.size = node.computeSize();
	node.setDirtyCanvas(true,true);
}


LGraphCanvas.onShowTitleEditor = function( value, options, e, menu, node )
{
	var input_html = "";

	var dialog = document.createElement("div");
	dialog.className = "graphdialog";
	dialog.innerHTML = "<span class='name'>Title</span><input autofocus type='text' class='value'/><button>OK</button>";
	var input = dialog.querySelector("input");
	if(input)
	{
		input.value = node.title;
		input.addEventListener("keydown", function(e){
			if(e.keyCode != 13)
				return;
			inner();
			e.preventDefault();
			e.stopPropagation();
		});
	}

	var graphcanvas = LGraphCanvas.active_canvas;
	var canvas = graphcanvas.canvas;

	var rect = canvas.getBoundingClientRect();
	var offsetx = -20;
	var offsety = -20;
	if(rect)
	{
		offsetx -= rect.left;
		offsety -= rect.top;
	}

	if( event )
	{
		dialog.style.left = (event.pageX + offsetx) + "px";
		dialog.style.top = (event.pageY + offsety)+ "px";
	}
	else
	{
		dialog.style.left = (canvas.width * 0.5 + offsetx) + "px";
		dialog.style.top = (canvas.height * 0.5 + offsety) + "px";
	}

	var button = dialog.querySelector("button");
	button.addEventListener("click", inner );
	canvas.parentNode.appendChild( dialog );

	function inner()
	{
		setValue( input.value );
	}

	function setValue(value)
	{
		node.title = value;
		dialog.parentNode.removeChild( dialog );
		node.setDirtyCanvas(true,true);
	}
}

LGraphCanvas.prototype.showEditPropertyValue = function( node, property, options )
{
	if(!node || node.properties[ property ] === undefined )
		return;

	options = options || {};
	var that = this;

	var type = "string";

	if(node.properties[ property ] !== null)
		type = typeof(node.properties[ property ]);

	var info = null;
	if(node.getPropertyInfo)
		info = node.getPropertyInfo(property);
	if(node.properties_info)
	{
		for(var i = 0; i < node.properties_info.length; ++i)
		{
			if( node.properties_info[i].name == property )
			{
				info = node.properties_info[i];
				break;
			}
		}
	}

	if(info !== undefined && info !== null && info.type )
		type = info.type;

	var input_html = "";

	if(type == "string" || type == "number")
		input_html = "<input autofocus type='text' class='value'/>";
	else if(type == "enum" && info.values)
	{
		input_html = "<select autofocus type='text' class='value'>";
		for(var i in info.values)
		{
			var v = info.values.constructor === Array ? info.values[i] : i;
			input_html += "<option value='"+v+"' "+(v == node.properties[property] ? "selected" : "")+">"+info.values[i]+"</option>";
		}
		input_html += "</select>";
	}
	else if(type == "boolean")
	{
		input_html = "<input autofocus type='checkbox' class='value' "+(node.properties[property] ? "checked" : "")+"/>";
	}

	var dialog = this.createDialog( "<span class='name'>" + property + "</span>"+input_html+"<button>OK</button>" , options );

	if(type == "enum" && info.values)
	{
		var input = dialog.querySelector("select");
		input.addEventListener("change", function(e){
			setValue( e.target.value );
			//var index = e.target.value;
			//setValue( e.options[e.selectedIndex].value );
		});
	}
	else if(type == "boolean")
	{
		var input = dialog.querySelector("input");
		if(input)
		{
			input.addEventListener("click", function(e){
				setValue( !!input.checked );
			});
		}
	}
	else
	{
		var input = dialog.querySelector("input");
		if(input)
		{
			input.value = node.properties[ property ] !== undefined ? node.properties[ property ] : "";
			input.addEventListener("keydown", function(e){
				if(e.keyCode != 13)
					return;
				inner();
				e.preventDefault();
				e.stopPropagation();
			});
		}
	}

	var button = dialog.querySelector("button");
	button.addEventListener("click", inner );

	function inner()
	{
		setValue( input.value );
	}

	function setValue(value)
	{
		if(typeof( node.properties[ property ] ) == "number")
			value = Number(value);
		node.properties[ property ] = value;

		if(node.onPropertyChanged)
			node.onPropertyChanged( property, value );
		dialog.close();
		node.setDirtyCanvas(true,true);
	}
}

LGraphCanvas.prototype.createDialog = function( html, options )
{
	options = options || {};

	var dialog = document.createElement("div");
	dialog.className = "graphdialog";
	dialog.innerHTML = html;

	var rect = this.canvas.getClientRects()[0];
	var offsetx = -20;
	var offsety = -20;
	if(rect)
	{
		offsetx -= rect.left;
		offsety -= rect.top;
	}

	if( options.position )
	{
		offsetx += options.position[0];
		offsety += options.position[1];
	}
	else if( options.event )
	{
		offsetx += options.event.pageX;
		offsety += options.event.pageY;
	}
	else //centered
	{
		offsetx += this.canvas.width * 0.5;
		offsety += this.canvas.height * 0.5;
	}

	dialog.style.left = offsetx + "px";
	dialog.style.top = offsety + "px";

	this.canvas.parentNode.appendChild( dialog );

	dialog.close = function()
	{
		if(this.parentNode)
			this.parentNode.removeChild( this );
	}

	return dialog;
}

LGraphCanvas.onMenuNodeCollapse = function( value, options, e, menu, node )
{
	node.flags.collapsed = !node.flags.collapsed;
	node.setDirtyCanvas(true,true);
}

LGraphCanvas.onMenuNodePin = function( value, options, e, menu, node )
{
	node.pin();
}

LGraphCanvas.onMenuNodeMode = function( value, options, e, menu, node )
{
	new LiteGraph.ContextMenu(["Always","On Event","On Trigger","Never"], {event: e, callback: inner_clicked, parentMenu: menu, node: node });

	function inner_clicked(v)
	{
		if(!node)
			return;
		switch(v)
		{
			case "On Event": node.mode = LiteGraph.ON_EVENT; break;
			case "On Trigger": node.mode = LiteGraph.ON_TRIGGER; break;
			case "Never": node.mode = LiteGraph.NEVER; break;
			case "Always":
			default:
				node.mode = LiteGraph.ALWAYS; break;
		}
	}

	return false;
}

LGraphCanvas.onMenuNodeColors = function( value, options, e, menu, node )
{
	if(!node)
		throw("no node for color");

	var values = [];
	for(var i in LGraphCanvas.node_colors)
	{
		var color = LGraphCanvas.node_colors[i];
		var value = {value:i, content:"<span style='display: block; color:"+color.color+"; background-color:"+color.bgcolor+"'>"+i+"</span>"};
		values.push(value);
	}
	new LiteGraph.ContextMenu( values, { event: e, callback: inner_clicked, parentMenu: menu, node: node });

	function inner_clicked(v)
	{
		if(!node)
			return;

		var color = LGraphCanvas.node_colors[ v.value ];
		if(color)
		{
			node.color = color.color;
			node.bgcolor = color.bgcolor;
			node.setDirtyCanvas(true);
		}
	}

	return false;
}

LGraphCanvas.onMenuNodeShapes = function( value, options, e, menu, node )
{
	if(!node)
		throw("no node passed");

	new LiteGraph.ContextMenu(["box","round"], { event: e, callback: inner_clicked, parentMenu: menu, node: node });

	function inner_clicked(v)
	{
		if(!node)
			return;
		node.shape = v;
		node.setDirtyCanvas(true);
	}

	return false;
}

LGraphCanvas.onMenuNodeRemove = function( value, options, e, menu, node )
{
	if(!node)
		throw("no node passed");

	if(node.removable == false)
		return;
	node.graph.remove(node);
	node.setDirtyCanvas(true,true);
}

LGraphCanvas.onMenuNodeClone = function( value, options, e, menu, node )
{
	if(node.clonable == false) return;
	var newnode = node.clone();
	if(!newnode) return;
	newnode.pos = [node.pos[0]+5,node.pos[1]+5];
	node.graph.add(newnode);
	node.setDirtyCanvas(true,true);
}

LGraphCanvas.node_colors = {
	"red": { color:"#FAA", bgcolor:"#A44" },
	"green": { color:"#AFA", bgcolor:"#4A4" },
	"blue": { color:"#AAF", bgcolor:"#44A" },
	"white": { color:"#FFF", bgcolor:"#AAA" }
};

LGraphCanvas.prototype.getCanvasMenuOptions = function()
{
	var options = null;
	if(this.getMenuOptions)
		options = this.getMenuOptions();
	else
	{
		options = [
			{ content:"Add Node", has_submenu: true, callback: LGraphCanvas.onMenuAdd }
			//{content:"Collapse All", callback: LGraphCanvas.onMenuCollapseAll }
		];

		if(this._graph_stack && this._graph_stack.length > 0)
			options = [{content:"Close subgraph", callback: this.closeSubgraph.bind(this) },null].concat(options);
	}

	if(this.getExtraMenuOptions)
	{
		var extra = this.getExtraMenuOptions(this,options);
		if(extra)
			options = options.concat( extra );
	}

	return options;
}

//called by processContextMenu to extract the menu list
LGraphCanvas.prototype.getNodeMenuOptions = function( node )
{
	var options = null;

	if(node.getMenuOptions)
		options = node.getMenuOptions(this);
	else
		options = [
			{content:"Inputs", has_submenu: true, disabled:true, callback: LGraphCanvas.showMenuNodeOptionalInputs },
			{content:"Outputs", has_submenu: true, disabled:true, callback: LGraphCanvas.showMenuNodeOptionalOutputs },
			null,
			{content:"Properties", has_submenu: true, callback: LGraphCanvas.onShowMenuNodeProperties },
			null,
			{content:"Title", callback: LGraphCanvas.onShowTitleEditor },
			{content:"Mode", has_submenu: true, callback: LGraphCanvas.onMenuNodeMode },
			{content:"Resize", callback: LGraphCanvas.onResizeNode },
			{content:"Collapse", callback: LGraphCanvas.onMenuNodeCollapse },
			{content:"Pin", callback: LGraphCanvas.onMenuNodePin },
			{content:"Colors", has_submenu: true, callback: LGraphCanvas.onMenuNodeColors },
			{content:"Shapes", has_submenu: true, callback: LGraphCanvas.onMenuNodeShapes },
			null
		];

	if(node.getExtraMenuOptions)
	{
		var extra = node.getExtraMenuOptions(this);
		if(extra)
		{
			extra.push(null);
			options = extra.concat( options );
		}
	}

	if( node.clonable !== false )
			options.push({content:"Clone", callback: LGraphCanvas.onMenuNodeClone });
	if( node.removable !== false )
			options.push(null,{content:"Remove", callback: LGraphCanvas.onMenuNodeRemove });

	if(node.onGetInputs)
	{
		var inputs = node.onGetInputs();
		if(inputs && inputs.length)
			options[0].disabled = false;
	}

	if(node.onGetOutputs)
	{
		var outputs = node.onGetOutputs();
		if(outputs && outputs.length )
			options[1].disabled = false;
	}

	if(node.graph && node.graph.onGetNodeMenuOptions )
		node.graph.onGetNodeMenuOptions( options, node );

	return options;
}

LGraphCanvas.prototype.processContextMenu = function( node, event )
{
	var that = this;
	var canvas = LGraphCanvas.active_canvas;
	var ref_window = canvas.getCanvasWindow();

	var menu_info = null;
	var options = { event: event, callback: inner_option_clicked, node: node };

	//check if mouse is in input
	var slot = null;
	if(node)
	{
		slot = node.getSlotInPosition( event.canvasX, event.canvasY );
		LGraphCanvas.active_node = node;
	}

	if(slot)
	{
		menu_info = [];
		menu_info.push( slot.locked ? "Cannot remove"  : { content: "Remove Slot", slot: slot } );
		menu_info.push( { content: "Rename Slot", slot: slot } );
		options.title = (slot.input ? slot.input.type : slot.output.type) || "*";
		if(slot.input && slot.input.type == LiteGraph.ACTION)
			options.title = "Action";
		if(slot.output && slot.output.type == LiteGraph.EVENT)
			options.title = "Event";

	}
	else
		menu_info = node ? this.getNodeMenuOptions(node) : this.getCanvasMenuOptions();

	//show menu
	if(!menu_info)
		return;

	var menu = new LiteGraph.ContextMenu( menu_info, options, ref_window );

	function inner_option_clicked( v, options, e )
	{
		if(!v)
			return;

		if(v.content == "Remove Slot")
		{
			var info = v.slot;
			if(info.input)
				node.removeInput( info.slot );
			else if(info.output)
				node.removeOutput( info.slot );
			return;
		}
		else if( v.content == "Rename Slot")
		{
			var info = v.slot;
			var dialog = that.createDialog( "<span class='name'>Name</span><input type='text'/><button>OK</button>" , options );
			var input = dialog.querySelector("input");
			dialog.querySelector("button").addEventListener("click",function(e){
				if(input.value)
				{
					var slot_info = info.input ? node.getInputInfo( info.slot ) : node.getOutputInfo( info.slot );
					if( slot_info )
						slot_info.label = input.value;
					that.setDirty(true);
				}	
				dialog.close();
			});
		}

		//if(v.callback)
		//	return v.callback.call(that, node, options, e, menu, that, event );
	}
}






//API *************************************************
//function roundRect(ctx, x, y, width, height, radius, radius_low) {
if(this.CanvasRenderingContext2D)
CanvasRenderingContext2D.prototype.roundRect = function (x, y, width, height, radius, radius_low) {
  if ( radius === undefined ) {
    radius = 5;
  }

  if(radius_low === undefined)
	 radius_low  = radius;

  this.beginPath();
  this.moveTo(x + radius, y);
  this.lineTo(x + width - radius, y);
  this.quadraticCurveTo(x + width, y, x + width, y + radius);

  this.lineTo(x + width, y + height - radius_low);
  this.quadraticCurveTo(x + width, y + height, x + width - radius_low, y + height);
  this.lineTo(x + radius_low, y + height);
  this.quadraticCurveTo(x, y + height, x, y + height - radius_low);
  this.lineTo(x, y + radius);
  this.quadraticCurveTo(x, y, x + radius, y);
}

function compareObjects(a,b)
{
	for(var i in a)
		if(a[i] != b[i])
			return false;
	return true;
}
LiteGraph.compareObjects = compareObjects;

function distance(a,b)
{
	return Math.sqrt( (b[0] - a[0]) * (b[0] - a[0]) + (b[1] - a[1]) * (b[1] - a[1]) );
}
LiteGraph.distance = distance;

function colorToString(c)
{
	return "rgba(" + Math.round(c[0] * 255).toFixed() + "," + Math.round(c[1] * 255).toFixed() + "," + Math.round(c[2] * 255).toFixed() + "," + (c.length == 4 ? c[3].toFixed(2) : "1.0") + ")";
}
LiteGraph.colorToString = colorToString;

function isInsideRectangle( x,y, left, top, width, height)
{
	if (left < x && (left + width) > x &&
		top < y && (top + height) > y)
		return true;
	return false;
}
LiteGraph.isInsideRectangle = isInsideRectangle;

//[minx,miny,maxx,maxy]
function growBounding( bounding, x,y)
{
	if(x < bounding[0])
		bounding[0] = x;
	else if(x > bounding[2])
		bounding[2] = x;

	if(y < bounding[1])
		bounding[1] = y;
	else if(y > bounding[3])
		bounding[3] = y;
}
LiteGraph.growBounding = growBounding;

//point inside boundin box
function isInsideBounding(p,bb)
{
	if (p[0] < bb[0][0] ||
		p[1] < bb[0][1] ||
		p[0] > bb[1][0] ||
		p[1] > bb[1][1])
		return false;
	return true;
}
LiteGraph.isInsideBounding = isInsideBounding;

//boundings overlap, format: [start,end]
function overlapBounding(a,b)
{
	if ( a[0] > b[2] ||
		a[1] > b[3] ||
		a[2] < b[0] ||
		a[3] < b[1])
		return false;
	return true;
}
LiteGraph.overlapBounding = overlapBounding;

//Convert a hex value to its decimal value - the inputted hex must be in the
//	format of a hex triplet - the kind we use for HTML colours. The function
//	will return an array with three values.
function hex2num(hex) {
	if(hex.charAt(0) == "#") hex = hex.slice(1); //Remove the '#' char - if there is one.
	hex = hex.toUpperCase();
	var hex_alphabets = "0123456789ABCDEF";
	var value = new Array(3);
	var k = 0;
	var int1,int2;
	for(var i=0;i<6;i+=2) {
		int1 = hex_alphabets.indexOf(hex.charAt(i));
		int2 = hex_alphabets.indexOf(hex.charAt(i+1));
		value[k] = (int1 * 16) + int2;
		k++;
	}
	return(value);
}

LiteGraph.hex2num = hex2num;

//Give a array with three values as the argument and the function will return
//	the corresponding hex triplet.
function num2hex(triplet) {
	var hex_alphabets = "0123456789ABCDEF";
	var hex = "#";
	var int1,int2;
	for(var i=0;i<3;i++) {
		int1 = triplet[i] / 16;
		int2 = triplet[i] % 16;

		hex += hex_alphabets.charAt(int1) + hex_alphabets.charAt(int2);
	}
	return(hex);
}

LiteGraph.num2hex = num2hex;

/* LiteGraph GUI elements used for canvas editing *************************************/

/**
* ContextMenu from LiteGUI
*
* @class ContextMenu
* @constructor
* @param {Array} values (allows object { title: "Nice text", callback: function ... })
* @param {Object} options [optional] Some options:\
* - title: title to show on top of the menu
* - callback: function to call when an option is clicked, it receives the item information
* - ignore_item_callbacks: ignores the callback inside the item, it just calls the options.callback
* - event: you can pass a MouseEvent, this way the ContextMenu appears in that position
*/
function ContextMenu( values, options )
{
	options = options || {};
	this.options = options;
	var that = this;

	//to link a menu with its parent
	if(options.parentMenu)
	{
		if( options.parentMenu.constructor !== this.constructor )
		{
			console.error("parentMenu must be of class ContextMenu, ignoring it");
			options.parentMenu = null;
		}
		else
		{
			this.parentMenu = options.parentMenu;
			this.parentMenu.lock = true;
			this.parentMenu.current_submenu = this;
		}
	}

	if(options.event && options.event.constructor !== MouseEvent && options.event.constructor !== CustomEvent)
	{
		console.error("Event passed to ContextMenu is not of type MouseEvent or CustomEvent. Ignoring it.");
		options.event = null;
	}

	var root = document.createElement("div");
	root.className = "litegraph litecontextmenu litemenubar-panel";
	root.style.minWidth = 100;
	root.style.minHeight = 100;
	root.style.pointerEvents = "none";
	setTimeout( function() { root.style.pointerEvents = "auto"; },100); //delay so the mouse up event is not caugh by this element

	//this prevents the default context browser menu to open in case this menu was created when pressing right button
	root.addEventListener("mouseup", function(e){
		e.preventDefault(); return true;
	}, true);
	root.addEventListener("contextmenu", function(e) {
		if(e.button != 2) //right button
			return false;
		e.preventDefault();
		return false;
	},true);

	root.addEventListener("mousedown", function(e){
		if(e.button == 2)
		{
			that.close();
			e.preventDefault(); return true;
		}
	}, true);


	this.root = root;

	//title
	if(options.title)
	{
		var element = document.createElement("div");
		element.className = "litemenu-title";
		element.innerHTML = options.title;
		root.appendChild(element);
	}

	//entries
	var num = 0;
	for(var i in values)
	{
		var name = values.constructor == Array ? values[i] : i;
		if( name != null && name.constructor !== String )
			name = name.content === undefined ? String(name) : name.content;
		var value = values[i];
		this.addItem( name, value, options );
		num++;
	}

	//close on leave
	root.addEventListener("mouseleave", function(e) {
		if(that.lock)
			return;
		that.close(e);
	});

	//insert before checking position
	var root_document = document;
	if(options.event)
		root_document = options.event.target.ownerDocument;

	if(!root_document)
		root_document = document;
	root_document.body.appendChild(root);

	//compute best position
	var left = options.left || 0;
	var top = options.top || 0;
	if(options.event)
	{
		left = (options.event.pageX - 10);
		top = (options.event.pageY - 10);
		if(options.title)
			top -= 20;

		if(options.parentMenu)
		{
			var rect = options.parentMenu.root.getBoundingClientRect();
			left = rect.left + rect.width;
		}

		var body_rect = document.body.getBoundingClientRect();
		var root_rect = root.getBoundingClientRect();

		if(left > (body_rect.width - root_rect.width - 10))
			left = (body_rect.width - root_rect.width - 10);
		if(top > (body_rect.height - root_rect.height - 10))
			top = (body_rect.height - root_rect.height - 10);
	}

	root.style.left = left + "px";
	root.style.top = top  + "px";
}

ContextMenu.prototype.addItem = function( name, value, options )
{
	var that = this;
	options = options || {};

	var element = document.createElement("div");
	element.className = "litemenu-entry submenu";

	var disabled = false;

	if(value === null)
	{
		element.classList.add("separator");
		//element.innerHTML = "<hr/>"
		//continue;
	}
	else
	{
		element.innerHTML = value && value.title ? value.title : name;
		element.value = value;

		if(value)
		{
			if(value.disabled)
			{
				disabled = true;
				element.classList.add("disabled");
			}
			if(value.submenu || value.has_submenu)
				element.classList.add("has_submenu");
		}

		if(typeof(value) == "function")
		{
			element.dataset["value"] = name;
			element.onclick_callback = value;
		}
		else
			element.dataset["value"] = value;
	}

	this.root.appendChild(element);
	if(!disabled)
		element.addEventListener("click", inner_onclick);
	if(options.autoopen)
		element.addEventListener("mouseenter", inner_over);

	function inner_over(e)
	{
		var value = this.value;
		if(!value || !value.has_submenu)
			return;
		inner_onclick.call(this,e);
	}

	//menu option clicked
	function inner_onclick(e) {
		var value = this.value;
		var close_parent = true;

		if(that.current_submenu)
			that.current_submenu.close(e);

		//global callback
		if(options.callback)
		{
			var r = options.callback.call( this, value, options, e, that, options.node );
			if(r === true)
				close_parent = false;
		}

		//special cases
		if(value)
		{
			if (value.callback && !options.ignore_item_callbacks && value.disabled !== true )  //item callback
			{
				var r = value.callback.call( this, value, options, e, that, options.node );
				if(r === true)
					close_parent = false;
			}
			if(value.submenu)
			{
				if(!value.submenu.options)
					throw("ContextMenu submenu needs options");
				var submenu = new that.constructor( value.submenu.options, {
					callback: value.submenu.callback,
					event: e,
					parentMenu: that,
					ignore_item_callbacks: value.submenu.ignore_item_callbacks,
					title: value.submenu.title,
					autoopen: options.autoopen
				});
				close_parent = false;
			}
		}

		if(close_parent && !that.lock)
			that.close();
	}

	return element;
}

ContextMenu.prototype.close = function(e, ignore_parent_menu)
{
	if(this.root.parentNode)
		this.root.parentNode.removeChild( this.root );
	if(this.parentMenu && !ignore_parent_menu)
	{
		this.parentMenu.lock = false;
		this.parentMenu.current_submenu = null;
		if( e === undefined )
			this.parentMenu.close();
		else if( e && !ContextMenu.isCursorOverElement( e, this.parentMenu.root) )
		{
			ContextMenu.trigger( this.parentMenu.root, "mouseleave", e );
		}
	}
	if(this.current_submenu)
		this.current_submenu.close(e, true);
}

//this code is used to trigger events easily (used in the context menu mouseleave
ContextMenu.trigger = function(element, event_name, params, origin)
{
	var evt = document.createEvent( 'CustomEvent' );
	evt.initCustomEvent( event_name, true,true, params ); //canBubble, cancelable, detail
	evt.srcElement = origin;
	if( element.dispatchEvent )
		element.dispatchEvent( evt );
	else if( element.__events )
		element.__events.dispatchEvent( evt );
	//else nothing seems binded here so nothing to do
	return evt;
}

//returns the top most menu
ContextMenu.prototype.getTopMenu = function()
{
	if( this.options.parentMenu )
		return this.options.parentMenu.getTopMenu();
	return this;
}

ContextMenu.prototype.getFirstEvent = function()
{
	if( this.options.parentMenu )
		return this.options.parentMenu.getFirstEvent();
	return this.options.event;
}



ContextMenu.isCursorOverElement = function( event, element )
{
	var left = event.pageX;
	var top = event.pageY;
	var rect = element.getBoundingClientRect();
	if(!rect)
		return false;
	if(top > rect.top && top < (rect.top + rect.height) &&
		left > rect.left && left < (rect.left + rect.width) )
		return true;
	return false;
}



LiteGraph.ContextMenu = ContextMenu;

LiteGraph.closeAllContextMenus = function( ref_window )
{
	ref_window = ref_window || window;

	var elements = ref_window.document.querySelectorAll(".litecontextmenu");
	if(!elements.length)
		return;

	var result = [];
	for(var i = 0; i < elements.length; i++)
		result.push(elements[i]);

	for(var i in result)
	{
		if(result[i].close)
			result[i].close();
		else if(result[i].parentNode)
			result[i].parentNode.removeChild( result[i] );
	}
}

LiteGraph.extendClass = function ( target, origin )
{
	for(var i in origin) //copy class properties
	{
		if(target.hasOwnProperty(i))
			continue;
		target[i] = origin[i];
	}

	if(origin.prototype) //copy prototype properties
		for(var i in origin.prototype) //only enumerables
		{
			if(!origin.prototype.hasOwnProperty(i))
				continue;

			if(target.prototype.hasOwnProperty(i)) //avoid overwritting existing ones
				continue;

			//copy getters
			if(origin.prototype.__lookupGetter__(i))
				target.prototype.__defineGetter__(i, origin.prototype.__lookupGetter__(i));
			else
				target.prototype[i] = origin.prototype[i];

			//and setters
			if(origin.prototype.__lookupSetter__(i))
				target.prototype.__defineSetter__(i, origin.prototype.__lookupSetter__(i));
		}
}

/*
LiteGraph.createNodetypeWrapper = function( class_object )
{
	//create Nodetype object
}
//LiteGraph.registerNodeType("scene/global", LGraphGlobal );
*/

if(typeof(window) !== undefined && !window["requestAnimationFrame"] )
{
	window.requestAnimationFrame = window.webkitRequestAnimationFrame ||
		  window.mozRequestAnimationFrame    ||
		  (function( callback ){
			window.setTimeout(callback, 1000 / 60);
		  });
}

})(this);