diff --git a/src/renderer/extensions/minimap/composables/useMinimapGraph.ts b/src/renderer/extensions/minimap/composables/useMinimapGraph.ts
index 4f1c0dd8e..c5bf9aa6c 100644
--- a/src/renderer/extensions/minimap/composables/useMinimapGraph.ts
+++ b/src/renderer/extensions/minimap/composables/useMinimapGraph.ts
@@ -1,11 +1,13 @@
 import { useThrottleFn } from '@vueuse/core'
-import { ref } from 'vue'
+import { ref, watch } from 'vue'
 import type { Ref } from 'vue'
 
 import type { LGraph, LGraphNode } from '@/lib/litegraph/src/litegraph'
 import type { NodeId } from '@/platform/workflow/validation/schemas/workflowSchema'
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
 import { api } from '@/scripts/api'
 
+import { MinimapDataSourceFactory } from '../data/MinimapDataSourceFactory'
 import type { UpdateFlags } from '../types'
 
 interface GraphCallbacks {
@@ -28,6 +30,9 @@ export function useMinimapGraph(
     viewport: false
   })
 
+  // Track LayoutStore version for change detection
+  const layoutStoreVersion = layoutStore.getVersion()
+
   // Map to store original callbacks per graph ID
   const originalCallbacksMap = new Map<string, GraphCallbacks>()
 
@@ -96,28 +101,30 @@ export function useMinimapGraph(
     let positionChanged = false
     let connectionChanged = false
 
-    if (g._nodes.length !== lastNodeCount.value) {
+    // Use unified data source for change detection
+    const dataSource = MinimapDataSourceFactory.create(g)
+
+    // Check for node count changes
+    const currentNodeCount = dataSource.getNodeCount()
+    if (currentNodeCount !== lastNodeCount.value) {
       structureChanged = true
-      lastNodeCount.value = g._nodes.length
+      lastNodeCount.value = currentNodeCount
     }
 
-    for (const node of g._nodes) {
-      const key = node.id
-      const currentState = `${node.pos[0]},${node.pos[1]},${node.size[0]},${node.size[1]}`
+    // Check for node position/size changes
+    const nodes = dataSource.getNodes()
+    for (const node of nodes) {
+      const nodeId = node.id
+      const currentState = `${node.x},${node.y},${node.width},${node.height}`
 
-      if (nodeStatesCache.get(key) !== currentState) {
+      if (nodeStatesCache.get(nodeId) !== currentState) {
         positionChanged = true
-        nodeStatesCache.set(key, currentState)
+        nodeStatesCache.set(nodeId, currentState)
       }
     }
 
-    const currentLinks = JSON.stringify(g.links || {})
-    if (currentLinks !== linksCache.value) {
-      connectionChanged = true
-      linksCache.value = currentLinks
-    }
-
-    const currentNodeIds = new Set(g._nodes.map((n: LGraphNode) => n.id))
+    // Clean up removed nodes from cache
+    const currentNodeIds = new Set(nodes.map((n) => n.id))
     for (const [nodeId] of nodeStatesCache) {
       if (!currentNodeIds.has(nodeId)) {
         nodeStatesCache.delete(nodeId)
@@ -125,6 +132,13 @@ export function useMinimapGraph(
       }
     }
 
+    // TODO: update when Layoutstore tracks links
+    const currentLinks = JSON.stringify(g.links || {})
+    if (currentLinks !== linksCache.value) {
+      connectionChanged = true
+      linksCache.value = currentLinks
+    }
+
     if (structureChanged || positionChanged) {
       updateFlags.value.bounds = true
       updateFlags.value.nodes = true
@@ -140,6 +154,10 @@ export function useMinimapGraph(
   const init = () => {
     setupEventListeners()
     api.addEventListener('graphChanged', handleGraphChangedThrottled)
+
+    watch(layoutStoreVersion, () => {
+      void handleGraphChangedThrottled()
+    })
   }
 
   const destroy = () => {
diff --git a/src/renderer/extensions/minimap/composables/useMinimapViewport.ts b/src/renderer/extensions/minimap/composables/useMinimapViewport.ts
index da67e5a7c..6f947a307 100644
--- a/src/renderer/extensions/minimap/composables/useMinimapViewport.ts
+++ b/src/renderer/extensions/minimap/composables/useMinimapViewport.ts
@@ -5,9 +5,9 @@ import { useCanvasTransformSync } from '@/composables/canvas/useCanvasTransformS
 import type { LGraph } from '@/lib/litegraph/src/litegraph'
 import {
   calculateMinimapScale,
-  calculateNodeBounds,
   enforceMinimumBounds
 } from '@/renderer/core/spatial/boundsCalculator'
+import { MinimapDataSourceFactory } from '@/renderer/extensions/minimap/data/MinimapDataSourceFactory'
 
 import type { MinimapBounds, MinimapCanvas, ViewportTransform } from '../types'
 
@@ -53,17 +53,15 @@ export function useMinimapViewport(
   }
 
   const calculateGraphBounds = (): MinimapBounds => {
-    const g = graph.value
-    if (!g || !g._nodes || g._nodes.length === 0) {
+    // Use unified data source
+    const dataSource = MinimapDataSourceFactory.create(graph.value)
+
+    if (!dataSource.hasData()) {
       return { minX: 0, minY: 0, maxX: 100, maxY: 100, width: 100, height: 100 }
     }
 
-    const bounds = calculateNodeBounds(g._nodes)
-    if (!bounds) {
-      return { minX: 0, minY: 0, maxX: 100, maxY: 100, width: 100, height: 100 }
-    }
-
-    return enforceMinimumBounds(bounds)
+    const sourceBounds = dataSource.getBounds()
+    return enforceMinimumBounds(sourceBounds)
   }
 
   const calculateScale = () => {
diff --git a/src/renderer/extensions/minimap/data/AbstractMinimapDataSource.ts b/src/renderer/extensions/minimap/data/AbstractMinimapDataSource.ts
new file mode 100644
index 000000000..4aae340b4
--- /dev/null
+++ b/src/renderer/extensions/minimap/data/AbstractMinimapDataSource.ts
@@ -0,0 +1,95 @@
+import type { LGraph } from '@/lib/litegraph/src/litegraph'
+import { calculateNodeBounds } from '@/renderer/core/spatial/boundsCalculator'
+
+import type {
+  IMinimapDataSource,
+  MinimapBounds,
+  MinimapGroupData,
+  MinimapLinkData,
+  MinimapNodeData
+} from '../types'
+
+/**
+ * Abstract base class for minimap data sources
+ * Provides common functionality and shared implementation
+ */
+export abstract class AbstractMinimapDataSource implements IMinimapDataSource {
+  constructor(protected graph: LGraph | null) {}
+
+  // Abstract methods that must be implemented by subclasses
+  abstract getNodes(): MinimapNodeData[]
+  abstract getNodeCount(): number
+  abstract hasData(): boolean
+
+  // Shared implementation using calculateNodeBounds
+  getBounds(): MinimapBounds {
+    const nodes = this.getNodes()
+    if (nodes.length === 0) {
+      return { minX: 0, minY: 0, maxX: 100, maxY: 100, width: 100, height: 100 }
+    }
+
+    // Convert MinimapNodeData to the format expected by calculateNodeBounds
+    const compatibleNodes = nodes.map((node) => ({
+      pos: [node.x, node.y],
+      size: [node.width, node.height]
+    }))
+
+    const bounds = calculateNodeBounds(compatibleNodes)
+    if (!bounds) {
+      return { minX: 0, minY: 0, maxX: 100, maxY: 100, width: 100, height: 100 }
+    }
+
+    return bounds
+  }
+
+  // Shared implementation for groups
+  getGroups(): MinimapGroupData[] {
+    if (!this.graph?._groups) return []
+    return this.graph._groups.map((group) => ({
+      x: group.pos[0],
+      y: group.pos[1],
+      width: group.size[0],
+      height: group.size[1],
+      color: group.color
+    }))
+  }
+
+  // TODO: update when Layoutstore supports links
+  getLinks(): MinimapLinkData[] {
+    if (!this.graph) return []
+    return this.extractLinksFromGraph(this.graph)
+  }
+
+  protected extractLinksFromGraph(graph: LGraph): MinimapLinkData[] {
+    const links: MinimapLinkData[] = []
+    const nodeMap = new Map(this.getNodes().map((n) => [n.id, n]))
+
+    for (const node of graph._nodes) {
+      if (!node.outputs) continue
+
+      const sourceNodeData = nodeMap.get(String(node.id))
+      if (!sourceNodeData) continue
+
+      for (const output of node.outputs) {
+        if (!output.links) continue
+
+        for (const linkId of output.links) {
+          const link = graph.links[linkId]
+          if (!link) continue
+
+          const targetNodeData = nodeMap.get(String(link.target_id))
+          if (!targetNodeData) continue
+
+          links.push({
+            sourceNode: sourceNodeData,
+            targetNode: targetNodeData,
+            sourceSlot: link.origin_slot,
+            targetSlot: link.target_slot
+          })
+        }
+      }
+    }
+
+    return links
+  }
+}
diff --git a/src/renderer/extensions/minimap/data/LayoutStoreDataSource.ts b/src/renderer/extensions/minimap/data/LayoutStoreDataSource.ts
new file mode 100644
index 000000000..c0daf7030
--- /dev/null
+++ b/src/renderer/extensions/minimap/data/LayoutStoreDataSource.ts
@@ -0,0 +1,42 @@
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+
+import type { MinimapNodeData } from '../types'
+import { AbstractMinimapDataSource } from './AbstractMinimapDataSource'
+
+/**
+ * Layout Store data source implementation
+ */
+export class LayoutStoreDataSource extends AbstractMinimapDataSource {
+  getNodes(): MinimapNodeData[] {
+    const allNodes = layoutStore.getAllNodes().value
+    if (allNodes.size === 0) return []
+
+    const nodes: MinimapNodeData[] = []
+
+    for (const [nodeId, layout] of allNodes) {
+      // Find corresponding LiteGraph node for additional properties
+      const graphNode = this.graph?._nodes?.find((n) => String(n.id) === nodeId)
+
+      nodes.push({
+        id: nodeId,
+        x: layout.position.x,
+        y: layout.position.y,
+        width: layout.size.width,
+        height: layout.size.height,
+        bgcolor: graphNode?.bgcolor,
+        mode: graphNode?.mode,
+        hasErrors: graphNode?.has_errors
+      })
+    }
+
+    return nodes
+  }
+
+  getNodeCount(): number {
+    return layoutStore.getAllNodes().value.size
+  }
+
+  hasData(): boolean {
+    return this.getNodeCount() > 0
+  }
+}
diff --git a/src/renderer/extensions/minimap/data/LiteGraphDataSource.ts b/src/renderer/extensions/minimap/data/LiteGraphDataSource.ts
new file mode 100644
index 000000000..8e1048e75
--- /dev/null
+++ b/src/renderer/extensions/minimap/data/LiteGraphDataSource.ts
@@ -0,0 +1,30 @@
+import type { MinimapNodeData } from '../types'
+import { AbstractMinimapDataSource } from './AbstractMinimapDataSource'
+
+/**
+ * LiteGraph data source implementation
+ */
+export class LiteGraphDataSource extends AbstractMinimapDataSource {
+  getNodes(): MinimapNodeData[] {
+    if (!this.graph?._nodes) return []
+
+    return this.graph._nodes.map((node) => ({
+      id: String(node.id),
+      x: node.pos[0],
+      y: node.pos[1],
+      width: node.size[0],
+      height: node.size[1],
+      bgcolor: node.bgcolor,
+      mode: node.mode,
+      hasErrors: node.has_errors
+    }))
+  }
+
+  getNodeCount(): number {
+    return this.graph?._nodes?.length ?? 0
+  }
+
+  hasData(): boolean {
+    return this.getNodeCount() > 0
+  }
+}
diff --git a/src/renderer/extensions/minimap/data/MinimapDataSourceFactory.ts b/src/renderer/extensions/minimap/data/MinimapDataSourceFactory.ts
new file mode 100644
index 000000000..49b15ed9e
--- /dev/null
+++ b/src/renderer/extensions/minimap/data/MinimapDataSourceFactory.ts
@@ -0,0 +1,22 @@
+import type { LGraph } from '@/lib/litegraph/src/litegraph'
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+
+import type { IMinimapDataSource } from '../types'
+import { LayoutStoreDataSource } from './LayoutStoreDataSource'
+import { LiteGraphDataSource } from './LiteGraphDataSource'
+
+/**
+ * Factory for creating the appropriate data source
+ */
+export class MinimapDataSourceFactory {
+  static create(graph: LGraph | null): IMinimapDataSource {
+    // Check if LayoutStore has data
+    const layoutStoreHasData = layoutStore.getAllNodes().value.size > 0
+
+    if (layoutStoreHasData) {
+      return new LayoutStoreDataSource(graph)
+    }
+
+    return new LiteGraphDataSource(graph)
+  }
+}
diff --git a/src/renderer/extensions/minimap/minimapCanvasRenderer.ts b/src/renderer/extensions/minimap/minimapCanvasRenderer.ts
index 2e0790ca9..3e547ce68 100644
--- a/src/renderer/extensions/minimap/minimapCanvasRenderer.ts
+++ b/src/renderer/extensions/minimap/minimapCanvasRenderer.ts
@@ -3,7 +3,12 @@ import { LGraphEventMode } from '@/lib/litegraph/src/litegraph'
 import { useColorPaletteStore } from '@/stores/workspace/colorPaletteStore'
 import { adjustColor } from '@/utils/colorUtil'
 
-import type { MinimapRenderContext } from './types'
+import { MinimapDataSourceFactory } from './data/MinimapDataSourceFactory'
+import type {
+  IMinimapDataSource,
+  MinimapNodeData,
+  MinimapRenderContext
+} from './types'
 
 /**
  * Get theme-aware colors for the minimap
@@ -25,24 +30,49 @@ function getMinimapColors() {
   }
 }
 
+/**
+ * Get node color based on settings and node properties (Single Responsibility)
+ */
+function getNodeColor(
+  node: MinimapNodeData,
+  settings: MinimapRenderContext['settings'],
+  colors: ReturnType<typeof getMinimapColors>
+): string {
+  if (settings.renderBypass && node.mode === LGraphEventMode.BYPASS) {
+    return colors.bypassColor
+  }
+
+  if (settings.nodeColors) {
+    if (node.bgcolor) {
+      return colors.isLightTheme
+        ? adjustColor(node.bgcolor, { lightness: 0.5 })
+        : node.bgcolor
+    }
+    return colors.nodeColorDefault
+  }
+
+  return colors.nodeColor
+}
+
 /**
  * Render groups on the minimap
  */
 function renderGroups(
   ctx: CanvasRenderingContext2D,
-  graph: LGraph,
+  dataSource: IMinimapDataSource,
   offsetX: number,
   offsetY: number,
   context: MinimapRenderContext,
   colors: ReturnType<typeof getMinimapColors>
 ) {
-  if (!graph._groups || graph._groups.length === 0) return
+  const groups = dataSource.getGroups()
+  if (groups.length === 0) return
 
-  for (const group of graph._groups) {
-    const x = (group.pos[0] - context.bounds.minX) * context.scale + offsetX
-    const y = (group.pos[1] - context.bounds.minY) * context.scale + offsetY
-    const w = group.size[0] * context.scale
-    const h = group.size[1] * context.scale
+  for (const group of groups) {
+    const x = (group.x - context.bounds.minX) * context.scale + offsetX
+    const y = (group.y - context.bounds.minY) * context.scale + offsetY
+    const w = group.width * context.scale
+    const h = group.height * context.scale
 
     let color = colors.groupColor
 
@@ -64,45 +94,34 @@ function renderGroups(
  */
 function renderNodes(
   ctx: CanvasRenderingContext2D,
-  graph: LGraph,
+  dataSource: IMinimapDataSource,
   offsetX: number,
   offsetY: number,
   context: MinimapRenderContext,
   colors: ReturnType<typeof getMinimapColors>
 ) {
-  if (!graph._nodes || graph._nodes.length === 0) return
+  const nodes = dataSource.getNodes()
+  if (nodes.length === 0) return
 
-  // Group nodes by color for batch rendering
+  // Group nodes by color for batch rendering (performance optimization)
   const nodesByColor = new Map<
     string,
     Array<{ x: number; y: number; w: number; h: number; hasErrors?: boolean }>
   >()
 
-  for (const node of graph._nodes) {
-    const x = (node.pos[0] - context.bounds.minX) * context.scale + offsetX
-    const y = (node.pos[1] - context.bounds.minY) * context.scale + offsetY
-    const w = node.size[0] * context.scale
-    const h = node.size[1] * context.scale
+  for (const node of nodes) {
+    const x = (node.x - context.bounds.minX) * context.scale + offsetX
+    const y = (node.y - context.bounds.minY) * context.scale + offsetY
+    const w = node.width * context.scale
+    const h = node.height * context.scale
 
-    let color = colors.nodeColor
-
-    if (context.settings.renderBypass && node.mode === LGraphEventMode.BYPASS) {
-      color = colors.bypassColor
-    } else if (context.settings.nodeColors) {
-      color = colors.nodeColorDefault
-
-      if (node.bgcolor) {
-        color = colors.isLightTheme
-          ? adjustColor(node.bgcolor, { lightness: 0.5 })
-          : node.bgcolor
-      }
-    }
+    const color = getNodeColor(node, context.settings, colors)
 
     if (!nodesByColor.has(color)) {
       nodesByColor.set(color, [])
     }
 
-    nodesByColor.get(color)!.push({ x, y, w, h, hasErrors: node.has_errors })
+    nodesByColor.get(color)!.push({ x, y, w, h, hasErrors: node.hasErrors })
   }
 
   // Batch render nodes by color
@@ -132,13 +151,14 @@ function renderNodes(
  */
 function renderConnections(
   ctx: CanvasRenderingContext2D,
-  graph: LGraph,
+  dataSource: IMinimapDataSource,
   offsetX: number,
   offsetY: number,
   context: MinimapRenderContext,
   colors: ReturnType<typeof getMinimapColors>
 ) {
-  if (!graph || !graph._nodes) return
+  const links = dataSource.getLinks()
+  if (links.length === 0) return
 
   ctx.strokeStyle = colors.linkColor
   ctx.lineWidth = 0.3
@@ -151,41 +171,28 @@ function renderConnections(
     y2: number
   }> = []
 
-  for (const node of graph._nodes) {
-    if (!node.outputs) continue
+  for (const link of links) {
+    const x1 =
+      (link.sourceNode.x - context.bounds.minX) * context.scale + offsetX
+    const y1 =
+      (link.sourceNode.y - context.bounds.minY) * context.scale + offsetY
+    const x2 =
+      (link.targetNode.x - context.bounds.minX) * context.scale + offsetX
+    const y2 =
+      (link.targetNode.y - context.bounds.minY) * context.scale + offsetY
 
-    const x1 = (node.pos[0] - context.bounds.minX) * context.scale + offsetX
-    const y1 = (node.pos[1] - context.bounds.minY) * context.scale + offsetY
+    const outputX = x1 + link.sourceNode.width * context.scale
+    const outputY = y1 + link.sourceNode.height * context.scale * 0.2
+    const inputX = x2
+    const inputY = y2 + link.targetNode.height * context.scale * 0.2
 
-    for (const output of node.outputs) {
-      if (!output.links) continue
+    // Draw connection line
+    ctx.beginPath()
+    ctx.moveTo(outputX, outputY)
+    ctx.lineTo(inputX, inputY)
+    ctx.stroke()
 
-      for (const linkId of output.links) {
-        const link = graph.links[linkId]
-        if (!link) continue
-
-        const targetNode = graph.getNodeById(link.target_id)
-        if (!targetNode) continue
-
-        const x2 =
-          (targetNode.pos[0] - context.bounds.minX) * context.scale + offsetX
-        const y2 =
-          (targetNode.pos[1] - context.bounds.minY) * context.scale + offsetY
-
-        const outputX = x1 + node.size[0] * context.scale
-        const outputY = y1 + node.size[1] * context.scale * 0.2
-        const inputX = x2
-        const inputY = y2 + targetNode.size[1] * context.scale * 0.2
-
-        // Draw connection line
-        ctx.beginPath()
-        ctx.moveTo(outputX, outputY)
-        ctx.lineTo(inputX, inputY)
-        ctx.stroke()
-
-        connections.push({ x1: outputX, y1: outputY, x2: inputX, y2: inputY })
-      }
-    }
+    connections.push({ x1: outputX, y1: outputY, x2: inputX, y2: inputY })
   }
 
   // Render connection slots on top
@@ -217,8 +224,11 @@ export function renderMinimapToCanvas(
   // Clear canvas
   ctx.clearRect(0, 0, context.width, context.height)
 
+  // Create unified data source (Dependency Inversion)
+  const dataSource = MinimapDataSourceFactory.create(graph)
+
   // Fast path for empty graph
-  if (!graph || !graph._nodes || graph._nodes.length === 0) {
+  if (!dataSource.hasData()) {
     return
   }
 
@@ -228,12 +238,12 @@ export function renderMinimapToCanvas(
 
   // Render in correct order: groups -> links -> nodes
   if (context.settings.showGroups) {
-    renderGroups(ctx, graph, offsetX, offsetY, context, colors)
+    renderGroups(ctx, dataSource, offsetX, offsetY, context, colors)
   }
 
   if (context.settings.showLinks) {
-    renderConnections(ctx, graph, offsetX, offsetY, context, colors)
+    renderConnections(ctx, dataSource, offsetX, offsetY, context, colors)
   }
 
-  renderNodes(ctx, graph, offsetX, offsetY, context, colors)
+  renderNodes(ctx, dataSource, offsetX, offsetY, context, colors)
 }
diff --git a/src/renderer/extensions/minimap/types.ts b/src/renderer/extensions/minimap/types.ts
index fbea21c83..b458718ea 100644
--- a/src/renderer/extensions/minimap/types.ts
+++ b/src/renderer/extensions/minimap/types.ts
@@ -2,6 +2,7 @@
  * Minimap-specific type definitions
  */
 import type { LGraph } from '@/lib/litegraph/src/litegraph'
+import type { NodeId } from '@/platform/workflow/validation/schemas/workflowSchema'
 
 /**
  * Minimal interface for what the minimap needs from the canvas
@@ -66,3 +67,50 @@ export type MinimapSettingsKey =
   | 'Comfy.Minimap.ShowGroups'
   | 'Comfy.Minimap.RenderBypassState'
   | 'Comfy.Minimap.RenderErrorState'
+
+/**
+ * Node data required for minimap rendering
+ */
+export interface MinimapNodeData {
+  id: NodeId
+  x: number
+  y: number
+  width: number
+  height: number
+  bgcolor?: string
+  mode?: number
+  hasErrors?: boolean
+}
+
+/**
+ * Link data required for minimap rendering
+ */
+export interface MinimapLinkData {
+  sourceNode: MinimapNodeData
+  targetNode: MinimapNodeData
+  sourceSlot: number
+  targetSlot: number
+}
+
+/**
+ * Group data required for minimap rendering
+ */
+export interface MinimapGroupData {
+  x: number
+  y: number
+  width: number
+  height: number
+  color?: string
+}
+
+/**
+ * Interface for minimap data sources (Dependency Inversion Principle)
+ */
+export interface IMinimapDataSource {
+  getNodes(): MinimapNodeData[]
+  getLinks(): MinimapLinkData[]
+  getGroups(): MinimapGroupData[]
+  getBounds(): MinimapBounds
+  getNodeCount(): number
+  hasData(): boolean
+}
diff --git a/tests-ui/tests/minimap/MinimapDataSource.test.ts b/tests-ui/tests/minimap/MinimapDataSource.test.ts
new file mode 100644
index 000000000..eff6ba771
--- /dev/null
+++ b/tests-ui/tests/minimap/MinimapDataSource.test.ts
@@ -0,0 +1,174 @@
+import { describe, expect, it, vi } from 'vitest'
+import { type ComputedRef, computed } from 'vue'
+
+import type { NodeId } from '@/lib/litegraph/src/LGraphNode'
+import type { LGraph, LGraphNode, LLink } from '@/lib/litegraph/src/litegraph'
+import { layoutStore } from '@/renderer/core/layout/store/layoutStore'
+import type { NodeLayout } from '@/renderer/core/layout/types'
+import { MinimapDataSourceFactory } from '@/renderer/extensions/minimap/data/MinimapDataSourceFactory'
+
+// Mock layoutStore
+vi.mock('@/renderer/core/layout/store/layoutStore', () => ({
+  layoutStore: {
+    getAllNodes: vi.fn()
+  }
+}))
+
+// Helper to create mock links that satisfy LGraph['links'] type
+function createMockLinks(): LGraph['links'] {
+  const map = new Map<number, LLink>()
+  return Object.assign(map, {}) as LGraph['links']
+}
+
+describe('MinimapDataSource', () => {
+  describe('MinimapDataSourceFactory', () => {
+    it('should create LayoutStoreDataSource when LayoutStore has data', () => {
+      // Arrange
+      const mockNodes = new Map<string, NodeLayout>([
+        [
+          'node1',
+          {
+            id: 'node1',
+            position: { x: 0, y: 0 },
+            size: { width: 100, height: 50 },
+            zIndex: 0,
+            visible: true,
+            bounds: { x: 0, y: 0, width: 100, height: 50 }
+          }
+        ]
+      ])
+
+      // Create a computed ref that returns the map
+      const computedNodes: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => mockNodes)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedNodes)
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource).toBeDefined()
+      expect(dataSource.hasData()).toBe(true)
+      expect(dataSource.getNodeCount()).toBe(1)
+    })
+
+    it('should create LiteGraphDataSource when LayoutStore is empty', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockNode: Pick<
+        LGraphNode,
+        'id' | 'pos' | 'size' | 'bgcolor' | 'mode' | 'has_errors' | 'outputs'
+      > = {
+        id: 'node1' as NodeId,
+        pos: [0, 0],
+        size: [100, 50],
+        bgcolor: '#fff',
+        mode: 0,
+        has_errors: false,
+        outputs: []
+      }
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [mockNode as LGraphNode],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource).toBeDefined()
+      expect(dataSource.hasData()).toBe(true)
+      expect(dataSource.getNodeCount()).toBe(1)
+
+      const nodes = dataSource.getNodes()
+      expect(nodes).toHaveLength(1)
+      expect(nodes[0]).toMatchObject({
+        id: 'node1',
+        x: 0,
+        y: 0,
+        width: 100,
+        height: 50
+      })
+    })
+
+    it('should handle empty graph correctly', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+
+      // Assert
+      expect(dataSource.hasData()).toBe(false)
+      expect(dataSource.getNodeCount()).toBe(0)
+      expect(dataSource.getNodes()).toEqual([])
+      expect(dataSource.getLinks()).toEqual([])
+      expect(dataSource.getGroups()).toEqual([])
+    })
+  })
+
+  describe('Bounds calculation', () => {
+    it('should calculate correct bounds from nodes', () => {
+      // Arrange
+      const emptyMap = new Map<string, NodeLayout>()
+      const computedEmpty: ComputedRef<ReadonlyMap<string, NodeLayout>> =
+        computed(() => emptyMap)
+      vi.mocked(layoutStore.getAllNodes).mockReturnValue(computedEmpty)
+
+      const mockNode1: Pick<LGraphNode, 'id' | 'pos' | 'size' | 'outputs'> = {
+        id: 'node1' as NodeId,
+        pos: [0, 0],
+        size: [100, 50],
+        outputs: []
+      }
+
+      const mockNode2: Pick<LGraphNode, 'id' | 'pos' | 'size' | 'outputs'> = {
+        id: 'node2' as NodeId,
+        pos: [200, 100],
+        size: [150, 75],
+        outputs: []
+      }
+
+      const mockGraph: Pick<LGraph, '_nodes' | '_groups' | 'links'> = {
+        _nodes: [mockNode1 as LGraphNode, mockNode2 as LGraphNode],
+        _groups: [],
+        links: createMockLinks()
+      }
+
+      // Act
+      const dataSource = MinimapDataSourceFactory.create(mockGraph as LGraph)
+      const bounds = dataSource.getBounds()
+
+      // Assert
+      expect(bounds).toEqual({
+        minX: 0,
+        minY: 0,
+        maxX: 350,
+        maxY: 175,
+        width: 350,
+        height: 175
+      })
+    })
+  })
+})