JS前端图形化插件之利器Gojs组件-js教程-PHP中文网

之前分享过两篇关于流程画图的前端组件，使用的jsplumb。这个组件本身还不错，使用方便、入门简单、轻量级，但是使用一段时间下来，发现一些弊病，比如组件不太稳定，初始进入页面的时候连线的样式有时会乱掉，刷新页面之后才能恢复正常，而且连线样式比较单一，容易让人产生视觉疲劳，加之最近公司在大力推行所谓的“工业4.0”，除了对自动化控制要求的提高之外，对这种图形化界面的要求也随之提高，所以单纯的jsplumb组件效果已经不能满足日益发展的公司业务。基于以上种种，最终找到了gojs组件，它效果强大、api丰富，唯一的不足就是这个组件是一个收费组件。

一、组件效果预览

先来两个炫酷点的效果

就最下面两个效果而言，就是jsPlumb无法实现的，可是这种效果在MES系统里面是很吸引人的，尤其是一些流程性的业务，用这种效果实现让可以一眼就感觉高大上了。并且咋一眼看上去，你根本都不相信这是一个web页面的效果。

其他效果示例

可折叠的树

这是图片吗？

竟然还可以生成图表！

想抢visio的饭碗吗？

更多示例可查看官网

二、初次接触

1、Gojs简介

GoJS是一个功能丰富的JS库，在Web浏览器和平台上可实现自定义交互图和复杂的可视化效果，它用自定义模板和布局组件简化了节点、链接和分组等复杂的JS图表，给用户交互提供了许多先进的功能，如拖拽、复制、粘贴、文本编辑、工具提示、上下文菜单、自动布局、模板、数据绑定和模型、事务状态和撤销管理、调色板、概述、事件处理程序、命令和自定义操作的扩展工具系统。无需切换服务器和插件，GoJS就能实现用户互动并在浏览器中完全运行，呈现HTML5 Canvas元素或SVG，也不用服务器端请求。 GoJS不依赖于任何JS库或框架（例如bootstrap、jquery等），可与任何HTML或JS框架配合工作，甚至可以不用框架。

2、使用入门

（1）文件引用

复制代码代码如下:

<script src="gojs/go-debug_ok.js"></script>

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可以用cdn上面的最新版本，也可以引用本地down下来的文件。如果是开发，可以引用debug版本的js，正式运行的时候引用正式的js，这个无需多讲。

（2）创建画布

随便定义一个html元素，作为我们的画布

复制代码代码如下:

<p id="myDiagramp" style="margin:auto;width:300px; height:300px; background-color:#ddd;"></p>

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然后使用gojs的api初始化画布

//创建画布
  var objGo = go.GraphObject.make;
  var myDiagram = objGo(go.Diagram, "myDiagramp",
   {
    //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, 
   });

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官方示例用的$符号作为变量，博主觉得$符号太敏感，还是换个名字吧~以上几个参数都是博主摘选的，更多初始化画布的参数请参考官方api下图：

（3）创建模型数据（Model）

接着上面的代码，我们增加如下几行

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

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效果预览

（4）创建节点（Node）

上面有了画布和节点数据，只是有了一个雏形，但是还没有任何的图形化效果。我们加入一些效果试试

在gojs里面给我们提供了几种模型节点的可选项：

Shape:形状——Rectangle（矩形）、RoundedRectangle（圆角矩形），Ellipse（椭圆形），Triangle（三角形），Diamond（菱形），Circle（圆形）等
TextBlock:文本域（可编辑）
Picture:图片
Panel:容器来保存其他Node的集合
默认的节点模型代码只是由一个TextBlock组件构建成

我们增加如下一段代码

// 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: &#39;red&#39; },
     // 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(&#39;fill&#39;, &#39;fill2&#39;)),
    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: &#39;YinYang&#39;, fill2: &#39;blue&#39; },
   { name: "车间", fig: &#39;Peace&#39;, fill2: &#39;red&#39; },
   { name: "工人", fig: &#39;NotAllowed&#39;, fill2: &#39;green&#39; },
   { name: "岗位", fig: &#39;Fragile&#39;, fill2: &#39;yellow&#39; },
  ];
  myDiagram.model = myModel; //将模型数据绑定到画布图上

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代码释疑：以上我们给画布对象定义了两种节点模板，一种是文本节点，另一种是形状节点（Node）。在形状节点中，我们定义了数据模型的通用节点样式，就是这一段代码{ /* Shape的参数。宽高颜色等等*/figure: "Club", width: 40, height: 60, margin: 4, fill: 'red' },然后通过new go.Binding("figure", "fig")方法将模板里面的属性映射到数据实例中，比如这里模板里面的figure属性定义的是Club，如果在我们的数据里面定义fig属性，那么它就会覆盖模板里面的figure的默认值。同样，fill和fill2也是通过同样的原理去区别模板中的样式和实例中的实际样式的！

注：更多figure属性的取值详见这里

效果如下

由此可见我们数据里面的属性会覆盖模板的原始属性，如果是新增的节点，由于没有自定义数据属性，所以呈现到界面上面的时候就是模板里面的原生样式！

（5）节点连线

有了上面的基础，我们可以在画布上面画出我们想要的图形效果了，可是还没有连线。我们知道连线是建立在节点模型的上面的，于是乎我们的Model又分为了以下三种类型：

Model：最基本的（不带连线，如上面的例子）

GraphLinksModel ：高级点的动态连线图

TreeModel：树形图的模型（从例子看好像用的不多）

GraphLinksModel中为model.nodeDataArray提供model.linkDataArray为node节点连线保存数据模型信息，其实也是的一个JSON数组对象，每个线条都有两个属性 “to” 和 “from” 即Node节点的“key”值，两个属性代表两个key表示两个节点间的连线。

我们上面已经写过最基本的Model的例子了，我们再来个带连线的Model的示例

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;

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效果如下

学习了Model、GraphLinksModel，还剩下一种TreeModel树节点的模型，这个博主不打算做详细介绍，有兴趣可以直接查看官网。

三、综合效果

关于综合效果，博主不打算将gojs的api逐个翻个遍了，这样太耗时间，伤不起，只是将官方示例中的部分源码截取出来供大家参考。有需要的再细究！

1、自定义流程的使用

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Draggable Link</title>
<meta name="description" content="Drag a link to reconnect it. Nodes have custom Adornments for selection, resizing, and reshaping." />
<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../../gojs/go-debug.js"></script>
<script id="code">
 function init() {
 if (window.goSamples) goSamples(); // init for these samples -- you don&#39;t need to call this
 var objGo = go.GraphObject.make; // for conciseness in defining templates

 myDiagram =
  objGo(go.Diagram, "myDiagramp", // must name or refer to the p HTML element
  {
   grid: objGo(go.Panel, "Grid",
     objGo(go.Shape, "LineH", { stroke: "lightgray", strokeWidth: 0.5 }),
     objGo(go.Shape, "LineH", { stroke: "gray", strokeWidth: 0.5, interval: 10 }),
     objGo(go.Shape, "LineV", { stroke: "lightgray", strokeWidth: 0.5 }),
     objGo(go.Shape, "LineV", { stroke: "gray", strokeWidth: 0.5, interval: 10 })
    ),
   allowDrop: true, // must be true to accept drops from the Palette
   "draggingTool.dragsLink": true,
   "draggingTool.isGridSnapEnabled": true,
   "linkingTool.isUnconnectedLinkValid": true,
   "linkingTool.portGravity": 20,
   "relinkingTool.isUnconnectedLinkValid": true,
   "relinkingTool.portGravity": 20,
   "relinkingTool.fromHandleArchetype":
   objGo(go.Shape, "Diamond", { segmentIndex: 0, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "tomato", stroke: "darkred" }),
   "relinkingTool.toHandleArchetype":
   objGo(go.Shape, "Diamond", { segmentIndex: -1, cursor: "pointer", desiredSize: new go.Size(8, 8), fill: "darkred", stroke: "tomato" }),
   "linkReshapingTool.handleArchetype":
   objGo(go.Shape, "Diamond", { desiredSize: new go.Size(7, 7), fill: "lightblue", stroke: "deepskyblue" }),
   rotatingTool: objGo(TopRotatingTool), // defined below
   "rotatingTool.snapAngleMultiple": 15,
   "rotatingTool.snapAngleEpsilon": 15,
   "undoManager.isEnabled": true
  });

 // when the document is modified, add a "*" to the title and enable the "Save" button
 myDiagram.addDiagramListener("Modified", function(e) {
  var button = document.getElementById("SaveButton");
  if (button) button.disabled = !myDiagram.isModified;
  var idx = document.title.indexOf("*");
  if (myDiagram.isModified) {
  if (idx < 0) document.title += "*";
  } else {
  if (idx >= 0) document.title = document.title.substr(0, idx);
  }
 });

 // Define a function for creating a "port" that is normally transparent.
 // The "name" is used as the GraphObject.portId, the "spot" is used to control how links connect
 // and where the port is positioned on the node, and the boolean "output" and "input" arguments
 // control whether the user can draw links from or to the port.
 function makePort(name, spot, output, input) {
  // the port is basically just a small transparent square
  return objGo(go.Shape, "Circle",
    {
     fill: null, // not seen, by default; set to a translucent gray by showSmallPorts, defined below
     stroke: null,
     desiredSize: new go.Size(7, 7),
     alignment: spot, // align the port on the main Shape
     alignmentFocus: spot, // just inside the Shape
     portId: name, // declare this object to be a "port"
     fromSpot: spot, toSpot: spot, // declare where links may connect at this port
     fromLinkable: output, toLinkable: input, // declare whether the user may draw links to/from here
     cursor: "pointer" // show a different cursor to indicate potential link point
    });
 }

 var nodeSelectionAdornmentTemplate =
  objGo(go.Adornment, "Auto",
  objGo(go.Shape, { fill: null, stroke: "deepskyblue", strokeWidth: 1.5, strokeDashArray: [4, 2] }),
  objGo(go.Placeholder)
  );

 var nodeResizeAdornmentTemplate =
  objGo(go.Adornment, "Spot",
  { locationSpot: go.Spot.Right },
  objGo(go.Placeholder),
  objGo(go.Shape, { alignment: go.Spot.TopLeft, cursor: "nw-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { alignment: go.Spot.Top, cursor: "n-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { alignment: go.Spot.TopRight, cursor: "ne-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),

  objGo(go.Shape, { alignment: go.Spot.Left, cursor: "w-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { alignment: go.Spot.Right, cursor: "e-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),

  objGo(go.Shape, { alignment: go.Spot.BottomLeft, cursor: "se-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { alignment: go.Spot.Bottom, cursor: "s-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { alignment: go.Spot.BottomRight, cursor: "sw-resize", desiredSize: new go.Size(6, 6), fill: "lightblue", stroke: "deepskyblue" })
  );

 var nodeRotateAdornmentTemplate =
  objGo(go.Adornment,
  { locationSpot: go.Spot.Center, locationObjectName: "CIRCLE" },
  objGo(go.Shape, "Circle", { name: "CIRCLE", cursor: "pointer", desiredSize: new go.Size(7, 7), fill: "lightblue", stroke: "deepskyblue" }),
  objGo(go.Shape, { geometryString: "M3.5 7 L3.5 30", isGeometryPositioned: true, stroke: "deepskyblue", strokeWidth: 1.5, strokeDashArray: [4, 2] })
  );

 myDiagram.nodeTemplate =
  objGo(go.Node, "Spot",
  { locationSpot: go.Spot.Center },
  new go.Binding("location", "loc", go.Point.parse).makeTwoWay(go.Point.stringify),
  { selectable: true, selectionAdornmentTemplate: nodeSelectionAdornmentTemplate },
  { resizable: true, resizeObjectName: "PANEL", resizeAdornmentTemplate: nodeResizeAdornmentTemplate },
  { rotatable: true, rotateAdornmentTemplate: nodeRotateAdornmentTemplate },
  new go.Binding("angle").makeTwoWay(),
  // the main object is a Panel that surrounds a TextBlock with a Shape
  objGo(go.Panel, "Auto",
   { name: "PANEL" },
   new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify),
   objGo(go.Shape, "Rectangle", // default figure
   {
    portId: "", // the default port: if no spot on link data, use closest side
    fromLinkable: true, toLinkable: true, cursor: "pointer",
    fill: "white", // default color
    strokeWidth: 2
   },
   new go.Binding("figure"),
   new go.Binding("fill")),
   objGo(go.TextBlock,
   {
    font: "bold 11pt Helvetica, Arial, sans-serif",
    margin: 8,
    maxSize: new go.Size(160, NaN),
    wrap: go.TextBlock.WrapFit,
    editable: true
   },
   new go.Binding("text").makeTwoWay())
  ),
  // four small named ports, one on each side:
  makePort("T", go.Spot.Top, false, true),
  makePort("L", go.Spot.Left, true, true),
  makePort("R", go.Spot.Right, true, true),
  makePort("B", go.Spot.Bottom, true, false),
  { // handle mouse enter/leave events to show/hide the ports
   mouseEnter: function(e, node) { showSmallPorts(node, true); },
   mouseLeave: function(e, node) { showSmallPorts(node, false); }
  }
  );

 function showSmallPorts(node, show) {
  node.ports.each(function(port) {
  if (port.portId !== "") { // don&#39;t change the default port, which is the big shape
   port.fill = show ? "rgba(0,0,0,.3)" : null;
  }
  });
 }

 var linkSelectionAdornmentTemplate =
  objGo(go.Adornment, "Link",
  objGo(go.Shape,
   // isPanelMain declares that this Shape shares the Link.geometry
   { isPanelMain: true, fill: null, stroke: "deepskyblue", strokeWidth: 0 }) // use selection object&#39;s strokeWidth
  );

 myDiagram.linkTemplate =
  objGo(go.Link, // the whole link panel
  { selectable: true, selectionAdornmentTemplate: linkSelectionAdornmentTemplate },
  { relinkableFrom: true, relinkableTo: true, reshapable: true },
  {
   routing: go.Link.AvoidsNodes,
   curve: go.Link.JumpOver,
   corner: 5,
   toShortLength: 4
  },
  new go.Binding("points").makeTwoWay(),
  objGo(go.Shape, // the link path shape
   { isPanelMain: true, strokeWidth: 2 }),
  objGo(go.Shape, // the arrowhead
   { toArrow: "Standard", stroke: null }),
  objGo(go.Panel, "Auto",
   new go.Binding("visible", "isSelected").ofObject(),
   objGo(go.Shape, "RoundedRectangle", // the link shape
   { fill: "#F8F8F8", stroke: null }),
   objGo(go.TextBlock,
   {
    textAlign: "center",
    font: "10pt helvetica, arial, sans-serif",
    stroke: "#919191",
    margin: 2,
    minSize: new go.Size(10, NaN),
    editable: true
   },
   new go.Binding("text").makeTwoWay())
  )
  );

 load(); // load an initial diagram from some JSON text

 // initialize the Palette that is on the left side of the page
 myPalette =
  objGo(go.Palette, "myPalettep", // must name or refer to the p HTML element
  {
   maxSelectionCount: 1,
   nodeTemplateMap: myDiagram.nodeTemplateMap, // share the templates used by myDiagram
   linkTemplate: // simplify the link template, just in this Palette
   objGo(go.Link,
    { // because the GridLayout.alignment is Location and the nodes have locationSpot == Spot.Center,
    // to line up the Link in the same manner we have to pretend the Link has the same location spot
    locationSpot: go.Spot.Center,
    selectionAdornmentTemplate:
     objGo(go.Adornment, "Link",
     { locationSpot: go.Spot.Center },
     objGo(go.Shape,
      { isPanelMain: true, fill: null, stroke: "deepskyblue", strokeWidth: 0 }),
     objGo(go.Shape, // the arrowhead
      { toArrow: "Standard", stroke: null })
     )
    },
    {
    routing: go.Link.AvoidsNodes,
    curve: go.Link.JumpOver,
    corner: 5,
    toShortLength: 4
    },
    new go.Binding("points"),
    objGo(go.Shape, // the link path shape
    { isPanelMain: true, strokeWidth: 2 }),
    objGo(go.Shape, // the arrowhead
    { toArrow: "Standard", stroke: null })
   ),
   model: new go.GraphLinksModel([ // specify the contents of the Palette
   { text: "Start", figure: "Circle", fill: "#00AD5F" },
   { text: "Step" },
   { text: "DB", figure: "Database", fill: "lightgray" },
   { text: "???", figure: "Diamond", fill: "lightskyblue" },
   { text: "End", figure: "Circle", fill: "#CE0620" },
   { text: "Comment", figure: "RoundedRectangle", fill: "lightyellow" }
   ], [
   // the Palette also has a disconnected Link, which the user can drag-and-drop
   { points: new go.List(go.Point).addAll([new go.Point(0, 0), new go.Point(30, 0), new go.Point(30, 40), new go.Point(60, 40)]) }
   ])
  });
 }


 function TopRotatingTool() {
 go.RotatingTool.call(this);
 }
 go.Diagram.inherit(TopRotatingTool, go.RotatingTool);

 /** @override */
 TopRotatingTool.prototype.updateAdornments = function(part) {
 go.RotatingTool.prototype.updateAdornments.call(this, part);
 var adornment = part.findAdornment("Rotating");
 if (adornment !== null) {
  adornment.location = part.rotateObject.getDocumentPoint(new go.Spot(0.5, 0, 0, -30)); // above middle top
 }
 };

 /** @override */
 TopRotatingTool.prototype.rotate = function(newangle) {
 go.RotatingTool.prototype.rotate.call(this, newangle + 90);
 };
 // end of TopRotatingTool class


 // Show the diagram&#39;s model in JSON format that the user may edit
 function save() {
 saveDiagramProperties(); // do this first, before writing to JSON
 document.getElementById("mySavedModel").value = myDiagram.model.toJson();
 myDiagram.isModified = false;
 }
 function load() {
 myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
 loadDiagramProperties(); // do this after the Model.modelData has been brought into memory
 }

 function saveDiagramProperties() {
 myDiagram.model.modelData.position = go.Point.stringify(myDiagram.position);
 }
 function loadDiagramProperties(e) {
 // set Diagram.initialPosition, not Diagram.position, to handle initialization side-effects
 var pos = myDiagram.model.modelData.position;
 if (pos) myDiagram.initialPosition = go.Point.parse(pos);
 }
</script>
</head>
<body onload="init()">
<p id="sample">
 <p style="width:100%; white-space:nowrap;">
 <span style="display: inline-block; vertical-align: top; width:105px">
  <p id="myPalettep" style="border: solid 1px black; height: 620px"></p>
 </span>

 <span style="display: inline-block; vertical-align: top; width:80%">
  <p id="myDiagramp" style="border: solid 1px black; height: 620px"></p>
 </span>
 </p>
 <p>
 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.
 </p>
 <p>
 The link-dragging functionality is enabled by setting some or all of the following properties:
 <a>DraggingTool.dragsLink</a>, <a>LinkingTool.isUnconnectedLinkValid</a>, and
 <a>RelinkingTool.isUnconnectedLinkValid</a>.
 </p>
 <p>
 Note that a Link is present in the <a>Palette</a> 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.
 </p>
 <p>
 This also demonstrates several custom Adornments:
 <a>Part.selectionAdornmentTemplate</a>, <a>Part.resizeAdornmentTemplate</a>, and
 <a>Part.rotateAdornmentTemplate</a>.
 </p>
 <p>
 Finally this sample demonstrates saving and restoring the <a>Diagram.position</a> as a property
 on the <a>Model.modelData</a> object that is automatically saved and restored when calling <a>Model.toJson</a>
 and <a>Model.fromJson</a>.
 </p>
 <p>
 <p>
  <button id="SaveButton" onclick="save()">Save</button>
  <button onclick="load()">Load</button>
  Diagram Model saved in JSON format:
 </p>
 <textarea id="mySavedModel" style="width:100%;height:300px">
{ "class": "go.GraphLinksModel",
 "linkFromPortIdProperty": "fromPort",
 "linkToPortIdProperty": "toPort",
 "nodeDataArray": [
 ],
 "linkDataArray": [
 ]}
 </textarea>
 </p>
</p>
</body>
</html>

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效果如下：

建议各位copy代码，在本地看到效果，然后再根据实际需求去研究它的api，这样才不会太盲目而花费太多时间。

2、工业流程图

<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Process Flow</title>
<meta name="description" content="A simple process flow or SCADA diagram editor, simulating equipment monitoring and control." />
<!-- Copyright 1998-2017 by Northwoods Software Corporation. -->
<meta charset="UTF-8">
<script src="../../gojs/go-debug.js"></script>
<script id="code">
 function init() {
 if (window.goSamples) goSamples(); // init for these samples -- you don&#39;t need to call this
 var $ = go.GraphObject.make; // for more concise visual tree definitions

 myDiagram =
  $(go.Diagram, "myDiagramp",
  {
   "grid.visible": true,
   "grid.gridCellSize": new go.Size(30, 20),
   "draggingTool.isGridSnapEnabled": true,
   "resizingTool.isGridSnapEnabled": true,
   "rotatingTool.snapAngleMultiple": 90,
   "rotatingTool.snapAngleEpsilon": 45,
   "undoManager.isEnabled": true
  });

 // when the document is modified, add a "*" to the title and enable the "Save" button
 myDiagram.addDiagramListener("Modified", function(e) {
  var button = document.getElementById("SaveButton");
  if (button) button.disabled = !myDiagram.isModified;
  var idx = document.title.indexOf("*");
  if (myDiagram.isModified) {
  if (idx < 0) document.title += "*";
  } else {
  if (idx >= 0) document.title = document.title.substr(0, idx);
  }
 });

 myDiagram.nodeTemplateMap.add("Process",
  $(go.Node, "Auto",
  { locationSpot: new go.Spot(0.5, 0.5), locationObjectName: "SHAPE",
   resizable: true, resizeObjectName: "SHAPE" },
  new go.Binding("location", "pos", go.Point.parse).makeTwoWay(go.Point.stringify),
  $(go.Shape, "Cylinder1",
   { name: "SHAPE",
   strokeWidth: 2,
   fill: $(go.Brush, "Linear",
     { start: go.Spot.Left, end: go.Spot.Right,
      0: "gray", 0.5: "white", 1: "gray" }),
   minSize: new go.Size(50, 50),
   portId: "", fromSpot: go.Spot.AllSides, toSpot: go.Spot.AllSides
   },
   new go.Binding("desiredSize", "size", go.Size.parse).makeTwoWay(go.Size.stringify)),
  $(go.TextBlock,
   { alignment: go.Spot.Center, textAlign: "center", margin: 5,
   editable: true },
   new go.Binding("text").makeTwoWay())
  ));

 myDiagram.nodeTemplateMap.add("Valve",
  $(go.Node, "Vertical",
  { locationSpot: new go.Spot(0.5, 1, 0, -21), locationObjectName: "SHAPE",
   selectionObjectName: "SHAPE", rotatable: true },
  new go.Binding("angle").makeTwoWay(),
  new go.Binding("location", "pos", go.Point.parse).makeTwoWay(go.Point.stringify),
  $(go.TextBlock,
   { alignment: go.Spot.Center, textAlign: "center", margin: 5, editable: true },
   new go.Binding("text").makeTwoWay(),
   // keep the text upright, even when the whole node has been rotated upside down
   new go.Binding("angle", "angle", function(a) { return a === 180 ? 180 : 0; }).ofObject()),
  $(go.Shape,
   { name: "SHAPE",
   geometryString: "F1 M0 0 L40 20 40 0 0 20z M20 10 L20 30 M12 30 L28 30",
   strokeWidth: 2,
   fill: $(go.Brush, "Linear", { 0: "gray", 0.35: "white", 0.7: "gray" }),
   portId: "", fromSpot: new go.Spot(1, 0.35), toSpot: new go.Spot(0, 0.35) })
  ));

 myDiagram.linkTemplate =
  $(go.Link,
  { routing: go.Link.AvoidsNodes, curve: go.Link.JumpGap, corner: 10, reshapable: true, toShortLength: 7 },
  new go.Binding("points").makeTwoWay(),
  // mark each Shape to get the link geometry with isPanelMain: true
  $(go.Shape, { isPanelMain: true, stroke: "black", strokeWidth: 5 }),
  $(go.Shape, { isPanelMain: true, stroke: "gray", strokeWidth: 3 }),
  $(go.Shape, { isPanelMain: true, stroke: "white", strokeWidth: 1, name: "PIPE", strokeDashArray: [10, 10] }),
  $(go.Shape, { toArrow: "Triangle", fill: "black", stroke: null })
  );

 load();

 loop(); // animate some flow through the pipes
 }

 function loop() {
 var diagram = myDiagram;
 setTimeout(function() {
  var oldskips = diagram.skipsUndoManager;
  diagram.skipsUndoManager = true;
  diagram.links.each(function(link) {
   var shape = link.findObject("PIPE");
   var off = shape.strokeDashOffset - 2;
   shape.strokeDashOffset = (off <= 0) ? 20 : off;
  });
  diagram.skipsUndoManager = oldskips;
  loop();
 }, 100);
 }

 function save() {
 document.getElementById("mySavedModel").value = myDiagram.model.toJson();
 myDiagram.isModified = false;
 }
 function load() {
 myDiagram.model = go.Model.fromJson(document.getElementById("mySavedModel").value);
 }
</script>

</head>
<body onload="init()">
<p id="sample">
 <p id="myDiagramp" style="border: solid 1px black; width:100%; height:500px"></p>
 <p>
 A <em>process flow diagram</em> 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.
 </p>
 <p>
 The diagram displays the background grid layer by setting <b>grid.visible</b> to true,
 and also allows snapping to the grid using <a>DraggingTool.isGridSnapEnabled</a>,
 <a>ResizingTool.isGridSnapEnabled</a>, and <a>RotatingTool.snapAngleMultiple</a> alongside <a>RotatingTool.snapAngleEpsilon</a>.
 </p>
 <p>
 The diagram also uses the <b>loop</b> function to animate the links by adjusting the <a>Shape.strokeDashOffset</a> every 100 ms.
 </p>
 <p>
 <p>
  <button id="SaveButton" onclick="save()">Save</button>
  <button onclick="load()">Load</button>
  Diagram Model saved in JSON format:
 </p>
 <textarea id="mySavedModel" style="width:100%;height:300px">
{ "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"}
 ]}
 </textarea>
 </p>
</p>
</body>
</html>

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工业流程图