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111 lines
2.3 KiB
Markdown
Executable File
111 lines
2.3 KiB
Markdown
Executable File
# litegraph.js
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A library in Javascript to create graphs in the browser similar to [PureData](https://puredata.info/). Nodes can be programmed easily and it includes an editor to construct the graphs.
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It can be integrated easily in any existing web applications and graphs can be run without the need of the editor.
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## Installation
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```
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npm install litegraph.js
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```
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## First project ##
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```html
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<html>
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<head>
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<script type="text/javascript" src="/litegraph.js"></script>
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</head>
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<body style='width:100%; height:100%'>
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<canvas id='mycanvas' width='1024' height='720' style='border: 1px solid'></canvas>
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<script>
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var graph = new LGraph();
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var canvas = new LGraphCanvas("#mycanvas", graph);
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var node_const = LiteGraph.createNode("basic/const");
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node_const.pos = [200,200];
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graph.add(node_const);
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node_const.setValue(4.5);
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var node_watch = LiteGraph.createNode("basic/watch");
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node_watch.pos = [700,200];
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graph.add(node_watch);
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node_const.connect(0, node_watch, 0 );
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graph.start()
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</script>
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</body>
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</html>
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```
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## How to code a new Node type
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Here is an example of how to build a node that sums two inputs:
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```javascript
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//node constructor class
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function MyAddNode()
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{
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this.addInput("A","number");
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this.addInput("B","number");
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this.addOutput("A+B","number");
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}
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//name to show
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MyAddNode.title = "Sum";
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//function to call when the node is executed
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MyAddNode.prototype.onExecute = function()
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{
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var A = this.getInputData(0);
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if( A === undefined )
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A = 0;
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var B = this.getInputData(1);
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if( B === undefined )
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B = 0;
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this.setOutputData( 0, A + B );
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}
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//register in the system
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LiteGraph.registerNodeType("basic/sum", MyAddNode );
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```
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## Projects using it
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### [webglstudio.org](http://webglstudio.org)
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### [MOI Elephant](http://moiscript.weebly.com/elephant-systegraveme-nodal.html)
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### [Mynodes.NET](http://www.mynodes.net)
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## Utils
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-----
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It includes several commands in the utils folder to generate doc, check errors and build minifyed version.
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## Feedback
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--------
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You can write any feedback to javi.agenjo@gmail.com
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## Contributors
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- kriffe
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