//创建画布
  var objGo = go.GraphObject.make;
  var myDiagram = objGo(go.Diagram, "myDiagramDiv",
   {
    //模型图的中心位置所在坐标
    initialContentAlignment: go.Spot.Center,
    
    //允许用户操作图表的时候使用Ctrl-Z撤销和Ctrl-Y重做快捷键
    "undoManager.isEnabled": true,
    
    //不运行用户改变图表的规模
    allowZoom: false,

    //画布上面是否出现网格
    "grid.visible": true,

    //允许在画布上面双击的时候创建节点
    "clickCreatingTool.archetypeNodeData": { text: "Node" },

    //允许使用ctrl+c、ctrl+v复制粘贴
    "commandHandler.copiesTree": true, 

    //允许使用delete键删除节点
    "commandHandler.deletesTree": true, 

    // dragging for both move and copy
    "draggingTool.dragsTree": true, 
   });

var myModel = objGo(go.Model);//创建Model对象
  // model中的数据每一个js对象都代表着一个相应的模型图中的元素
  myModel.nodeDataArray = [
   { key: "工厂" },
   { key: "车间" },
   { key: "工人" },
   { key: "岗位" },
  ];
  myDiagram.model = myModel; //将模型数据绑定到画布图上

// 定义一个简单的节点模板
  myDiagram.nodeTemplate =
   objGo(go.Node, "Horizontal",//横向布局的面板
    // 节点淡蓝色背景
    { background: "#44CCFF" },
    objGo(go.Shape,
     "RoundedRectangle", //定义形状，这是圆角矩形
     { /* Shape的参数。宽高颜色等等*/figure: "Club", width: 40, height: 60, margin: 4, fill: 'red' },
     // 绑定 Shape.figure属性为Node.data.fig的值，Model对象可以通过Node.data.fig 获取和设置Shape.figure（修改形状）
     new go.Binding("figure", "fig"), new go.Binding('fill', 'fill2')),
    objGo(go.TextBlock,
     "Default Text", // 默认文本
     // 设置字体大小颜色以及边距
     { margin: 12, stroke: "white", font: "bold 16px sans-serif" },
     //绑定TextBlock.text 属性为Node.data.name的值，Model对象可以通过Node.data.name获取和设置TextBlock.text
     new go.Binding("text", "name"))
   );

  var myModel = objGo(go.Model);//创建Model对象
  // model中的数据每一个js对象都代表着一个相应的模型图中的元素
  myModel.nodeDataArray = [
   { name: "工厂", fig: 'YinYang', fill2: 'blue' },
   { name: "车间", fig: 'Peace', fill2: 'red' },
   { name: "工人", fig: 'NotAllowed', fill2: 'green' },
   { name: "岗位", fig: 'Fragile', fill2: 'yellow' },
  ];
  myDiagram.model = myModel; //将模型数据绑定到画布图上

var myModel = objGo(go.GraphLinksModel);
  myModel.nodeDataArray =
   [
    { key: "aaa" ,name: "工厂" },
    { key: "bbb" ,name: "车间"},
    { key: "ccc" ,name: "车间" }
   ];
  myModel.linkDataArray =
   [
    { from: "aaa", to: "bbb" },
    { from: "bbb", to: "ccc" }
   ];
  myDiagram.model = myModel;

 

 
  

 

 
  

 
 
 

 This sample demonstrates the ability for the user to drag around a Link as if it were a Node.
 When either end of the link passes over a valid port, the port is highlighted.
 
 

 The link-dragging functionality is enabled by setting some or all of the following properties:
 DraggingTool.dragsLink, LinkingTool.isUnconnectedLinkValid, and
 RelinkingTool.isUnconnectedLinkValid.
 
 

 Note that a Link is present in the Palette so that it too can be dragged out and onto
 the main Diagram. Because links are not automatically routed when either end is not connected
 with a Node, the route is provided explicitly when that Palette item is defined.
 
 

 This also demonstrates several custom Adornments:
 Part.selectionAdornmentTemplate, Part.resizeAdornmentTemplate, and
 Part.rotateAdornmentTemplate.
 
 

 Finally this sample demonstrates saving and restoring the Diagram.position as a property
 on the Model.modelData object that is automatically saved and restored when calling Model.toJson
 and Model.fromJson.
 
 

 

  Save
  Load
  Diagram Model saved in JSON format:
 
 { "class": "go.GraphLinksModel",
 "linkFromPortIdProperty": "fromPort",
 "linkToPortIdProperty": "toPort",
 "nodeDataArray": [
 ],
 "linkDataArray": [
 ]}
 
 

 

 

 A process flow diagram is commonly used in chemical and process engineering to indicate the general flow of plant processes and equipment.
 A simple SCADA diagram, with animation of the flow along the pipes, is implemented here.
 
 

 The diagram displays the background grid layer by setting grid.visible to true,
 and also allows snapping to the grid using DraggingTool.isGridSnapEnabled,
 ResizingTool.isGridSnapEnabled, and RotatingTool.snapAngleMultiple alongside RotatingTool.snapAngleEpsilon.
 
 

 The diagram also uses the loop function to animate the links by adjusting the Shape.strokeDashOffset every 100 ms.
 
 

 

  Save
  Load
  Diagram Model saved in JSON format:
 
 { "class": "go.GraphLinksModel",
 "nodeDataArray": [
{"key":"P1", "category":"Process", "pos":"150 120", "text":"Process"},
{"key":"P2", "category":"Process", "pos":"330 320", "text":"Tank"},
{"key":"V1", "category":"Valve", "pos":"270 120", "text":"V1"},
{"key":"P3", "category":"Process", "pos":"150 420", "text":"Pump"},
{"key":"V2", "category":"Valve", "pos":"150 280", "text":"VM", "angle":270},
{"key":"V3", "category":"Valve", "pos":"270 420", "text":"V2", "angle":180},
{"key":"P4", "category":"Process", "pos":"450 140", "text":"Reserve Tank"},
{"key":"V4", "category":"Valve", "pos":"390 60", "text":"VA"},
{"key":"V5", "category":"Valve", "pos":"450 260", "text":"VB", "angle":90}
 ],
 "linkDataArray": [
{"from":"P1", "to":"V1"},
{"from":"P3", "to":"V2"},
{"from":"V2", "to":"P1"},
{"from":"P2", "to":"V3"},
{"from":"V3", "to":"P3"},
{"from":"V1", "to":"V4"},
{"from":"V4", "to":"P4"},
{"from":"V1", "to":"P2"},
{"from":"P4", "to":"V5"},
{"from":"V5", "to":"P2"}
 ]}