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用HTML5构建一个流程图绘制工具

刚 posted @ 2014年11月28日 16:27 in 软件开发 with tags html5 flowchart , 22156 阅读
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在我们的开发工程中经常会使用到各种图，所谓的图就是由节点和节点之间的连接所形成的系统，数学上专门有一个分支叫图论（Graph Theroy）。利用图我们可以做很多工具，比如思维导图，流程图，状态机，组织架构图，等等。今天我要做的是用开源的HTML5工具来快速构造一个做图的工具。

工具选择

预先善其事，必先利其器。第一件事是选择一件合适的工具，开源时代，程序员还是很幸福的，选择很多。

最终，我选择了jsPlumb，因为它完全开源，使用很简单，用D3的话可能会多花很多功夫。joint.js也不错。大家可以根据自己的需要选择。

构建静态应用

下面我们一步一步的来使用jsPlumb来创建我们的流程图工具。

第一步是等待DOM和jsPlumb初始化完毕，类似document.ready()和jquery.ready(), 要使用jsPlumb, 需要把代码放在这个函数里：

jsPlumb.ready(function() {
    // ... your code goes here ...
}

 

创建一个jsPlumb的实例，并初始化jsPlumb的配置参数：

//Initialize JsPlumb
var color = "#E8C870";
var instance = jsPlumb.getInstance({
    // notice the 'curviness' argument to this Bezier curve.  the curves on this page are far smoother
    // than the curves on the first demo, which use the default curviness value.      
    Connector : [ "Bezier", { curviness:50 } ],
    DragOptions : { cursor: "pointer", zIndex:2000 },
    PaintStyle : { strokeStyle:color, lineWidth:2 },
    EndpointStyle : { radius:5, fillStyle:color },
    HoverPaintStyle : {strokeStyle:"#7073EB" },
    EndpointHoverStyle : {fillStyle:"#7073EB" },
    Container:"container-id"
 });

 

这里给给出了一些配置包括，连接线（这里配置了一个贝塞尔曲线），线的风格，连接点得风格。Container需要配置一个对应的DIV容器的id。（这里也可以使用setContainer的方法）

下面我们要创建一个节点（node），每一个节点可以用一个DIV来实现。我这里提供了一个函数来创建节点。

function addNode(parentId, nodeId, nodeLable, position) {
  var panel = d3.select("#" + parentId);
  panel.append('div').style('width','120px').style('height','50px')
    .style('position','absolute')
    .style('top',position.y).style('left',position.x)
    .style('border','2px #9DFFCA solid').attr('align','center')
    .attr('id',nodeId).classed('node',true)
    .text(nodeLable);

  return jsPlumb.getSelector('#' + nodeId)[0];
}

 

这里做的事情就是创建了一个DIV元素，并放在对应的容器的制定位置上，注意为了支持拖拽的功能，必须使用position:absolute 。

我使用D3来操作DOM，大家可能会更习惯JQuery，这纯属个人喜好的问题。

最后返回创建节点的实例引用，这是的selector使用了jsPlumb.getSelector()方法，它和JQuery的selector是一样的，这样用的好处是你可以使用不同的DOM操作库，例如Vanilla

下面我使用一个函数来创建端点/锚点（anchor），锚点就是节点上的连接点，用于连接不同的节点。

function addPorts(instance, node, ports, type) {
  //Assume horizental layout
  var number_of_ports = ports.length;
  var i = 0;
  var height = $(node).height();  //Note, jquery does not include border for height
  var y_offset = 1 / ( number_of_ports + 1);
  var y = 0;

  for ( ; i < number_of_ports; i++ ) {
    var anchor = [0,0,0,0];
    var paintStyle = { radius:5, fillStyle:'#FF8891' };
    var isSource = false, isTarget = false;
    if ( type === 'output' ) {
      anchor[0] = 1;
      paintStyle.fillStyle = '#D4FFD6';
      isSource = true;
    } else {
      isTarget =true;
    }

    anchor[1] = y + y_offset;
    y = anchor[1];

    instance.addEndpoint(node, {
      uuid:node.getAttribute("id") + "-" + ports[i],
      paintStyle: paintStyle,
      anchor:anchor,
      maxConnections:-1,
      isSource:isSource,
      isTarget:isTarget
    });
  }
}

 

instance是jsPlumb的实例

node是我们用addNode方法创建的Node实例

ports，是一个string的数组，指定端点的个数和名字

type，可能是output或者input，指定端点的种类，一个节点的输出端口可以连接另一个节点的输入端口。

这里anchor是一个四维数组，0维和1维分别是锚点在节点x轴和y轴的偏移百分比。我这里希望把端口画在节点的左右两侧，并按照端口的数量均匀分布。

最后使用instance.addEndpoint来创建端点。注意这里只要指定isSource和isTarget就可以用drag&drop的方式来连接端点，非常方便。

下面一步我们提供一个函数来连接端点：

function connectPorts(instance, node1, port1, node2 , port2) {
  // declare some common values:
  var color = "gray";
  var arrowCommon = { foldback:0.8, fillStyle:color, width:5 },
  // use three-arg spec to create two different arrows with the common values:
  overlays = [
    [ "Arrow", { location:0.8 }, arrowCommon ],
    [ "Arrow", { location:0.2, direction:-1 }, arrowCommon ]
  ];

  var uuid_source = node1.getAttribute("id") + "-" + port1;
  var uuid_target = node2.getAttribute("id") + "-" + port2;

  instance.connect({uuids:[uuid_source, uuid_target]});
}

 

node1和node2是源节点和目标节点的引用，port1和port2是源端口和目标端口的名字。

使用instance.connect方法来创建连接。 overlays用来添加连接线的箭头效果或者其他风格，我这里没有使用，因为觉得都不是很好看。大家如果要用，只要把overlays加入到instance.connect的方法参数就可以了。

调用以上方法来创建节点，端点和连接线。

var node1 = addNode('container-id','node1', 'node1', {x:'80px',y:'20px'});
var node2 = addNode('container-id','node2', 'node2', {x:'280px',y:'20px'});

addPorts(instance, node1, ['out1','out2'],'output');
addPorts(instance, node2, ['in','in1','in2'],'input');

connectPorts(instance, node1, 'out2', node2, 'in');

 

这里我们创建了两个节点，第一个节点有两个输出端口，第二个节点有三个输入端口，然后把第一个节点的out2端口连接到第二个端点的in端口。效果如下：

最后我们给节点增加drag&drop的功能，这样我们就可以拖动这些节点来改变图的布局了。

instance.draggable($('.node'));

 

这里似乎依赖于JQuery-UI,我还不是很清楚。

交互式创建节点

我们已经初步具有了创建图的功能，可是节点的创建必须通过程序，我们希望用交互的方式来创建节点。

通常我们希望有一个tree view的控件，让后通过拖拽来创建对应类型的节点。这里我使用了这个开源的tree view，基于bootstrap https://github.com/jonmiles/bootstrap-treeview

我们先创建一个tree view：

function getTreeData() {
  var tree = [
    {
      text: "Nodes",
      nodes: [
        {
          text: "Node1",
        },
        {
          text: "Node2"
        }
      ]
    }
  ]; 

  return tree;
}
//Initialize Control Tree View
$('#control-panel').treeview({data: getTreeData()});

 

树上有两个节点:

然后我实现从树上拖拽对应的节点，到流程图上的逻辑。

//Handle drag and drop
$('.list-group-item').attr('draggable','true').on('dragstart', function(ev){
  //ev.dataTransfer.setData("text", ev.target.id);
  ev.originalEvent.dataTransfer.setData('text',ev.target.textContent);
  console.log('drag start');
});

$('#container-id').on('drop', function(ev){
  //avoid event conlict for jsPlumb
  if (ev.target.className.indexOf('_jsPlumb') >= 0 ) {
    return;
  }

  ev.preventDefault();
  var mx = '' + ev.originalEvent.offsetX + 'px';
  var my = '' + ev.originalEvent.offsetY + 'px';

  console.log('on drop : ' + ev.originalEvent.dataTransfer.getData('text'));
  var uid = new Date().getTime();
  var node = addNode('flow-panel','node' + uid, 'node', {x:mx,y:my});
  addPorts(instance, node, ['out'],'output');
  addPorts(instance, node, ['in1','in2'],'input');
  instance.draggable($(node));
}).on('dragover', function(ev){
  ev.preventDefault();
  console.log('on drag over');
});

 

这里要注意的是要避免和jsPlumb拖拽端点的逻辑冲突，当检测到target是jsPlumb对象是需要直接从drop方法中退出以执行对应的jsPlumb的drop逻辑。

好了，一个绘制流程图的软件工具初步完工。

我把代码放在oschina的代码托管服务上了， 大家有兴趣可以下来试试 http://git.oschina.net/gangtao/FlowChart-Builder


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