JS组件系列之Gojs组件 前端图形化插件之利器

前言：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，可是在天朝，嘘...这是个不能说的秘密！

本文原创地址：

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

二、初次接触

老规矩，还是先来个入门教程。

源码下载：https://github.com/northwoodssoftware/gojs

api详情：

示例地址：

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

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

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

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

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, "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, 
   });

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

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: '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

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;

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't need to call this
 var objgo = go.graphobject.make; // for conciseness in defining templates

 mydiagram =
  objgo(go.diagram, "mydiagramdiv", // must name or refer to the div 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'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'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, "mypalettediv", // must name or refer to the div 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'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()">
<div id="sample">
 <div style="width:100%; white-space:nowrap;">
 <span style="display: inline-block; vertical-align: top; width:105px">
  <div id="mypalettediv" style="border: solid 1px black; height: 620px"></div>
 </span>

 <span style="display: inline-block; vertical-align: top; width:80%">
  <div id="mydiagramdiv" style="border: solid 1px black; height: 620px"></div>
 </span>
 </div>
 <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>
 <div>
 <div>
  <button id="savebutton" onclick="save()">save</button>
  <button onclick="load()">load</button>
  diagram model saved in json format:
 </div>
 <textarea id="mysavedmodel" style="width:100%;height:300px">
{ "class": "go.graphlinksmodel",
 "linkfromportidproperty": "fromport",
 "linktoportidproperty": "toport",
 "nodedataarray": [
 ],
 "linkdataarray": [
 ]}
 </textarea>
 </div>
</div>
</body>
</html>

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't need to call this
 var $ = go.graphobject.make; // for more concise visual tree definitions

 mydiagram =
  $(go.diagram, "mydiagramdiv",
  {
   "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()">
<div id="sample">
 <div id="mydiagramdiv" style="border: solid 1px black; width:100%; height:500px"></div>
 <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>
 <div>
 <div>
  <button id="savebutton" onclick="save()">save</button>
  <button onclick="load()">load</button>
  diagram model saved in json format:
 </div>
 <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>
 </div>
</div>
</body>
</html>

工业流程图

四、总结

本文根据js的一些基础用法做了简单介绍，今天就先到这里，以后有问题了再来跟大家分享。如果你的项目里面也有这种业务需求，可以用起来试试！需要说明一点，如果您的公司不缺钱，建议使用正版授权的组件，毕竟尊重作者的劳动成果很重要！

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。