问题描述

如何在 arbor.js 中为边缘添加标签它是一个图形可视化库.

How do I add labels to edges in arbor.js It is a graph visualization library.

假设 A 和 B 是节点，E 是边一种粗略的方法是插入一个文本节点"T并加入 A-T 和 T-B

Suppose A and B are nodes and E is the edge One crude way would be insert a "text node" T and join A-T and T-B

但我不想这样，有没有其他办法?

But i don't want to this, is there any other way?

这是示例代码

var theUI = {
  nodes:{A:{color:"red", shape:"dot", alpha:1}, 
      B:{color:"#b2b19d", shape:"dot", alpha:1}, 
      C:{color:"#b2b19d", shape:"dot", alpha:1}, 
      D:{color:"#b2b19d", shape:"dot", alpha:1},
  },
  edges:{
      A:{
          B:{length:.8},
          C:{length:.8},
          D:{length:.8}
           }
  }
}

var sys = arbor.ParticleSystem()
sys.parameters({stiffness:900, repulsion:2000, gravity:true, dt:0.015})
sys.renderer = Renderer("#sitemap")
sys.graft(theUI) 

在此，A 连接到 B、C 和 D.如何为边缘提供标签?

In this, A is connected to B, C and D. How to supply label to edges?

推荐答案

arbor.js 允许您编写代码来呈现整个图形.您可以在渲染方法中做任何您想做的事情，包括绘制边缘标题，您可以将其存储在单独的地图中.

arbor.js allows you to write a code to render the whole graph. You can do whatever you want in render method including drawing edges titles which you can store in a separate map.

只需用这种方式覆盖 Renderer 中的方法渲染:

Just override method render in Renderer this way:

redraw:function()
{
    ctx.fillStyle = "white";
    ctx.fillRect (0,0, canvas.width, canvas.height);

    particleSystem.eachEdge (function (edge, pt1, pt2)
    {
        ctx.strokeStyle = "rgba(0,0,0, .333)";
        ctx.lineWidth = 1;
        ctx.beginPath ();
        ctx.moveTo (pt1.x, pt1.y);
        ctx.lineTo (pt2.x, pt2.y);
        ctx.stroke ();

        ctx.fillStyle = "black";
        ctx.font = 'italic 13px sans-serif';
        ctx.fillText (edge.data.name, (pt1.x + pt2.x) / 2, (pt1.y + pt2.y) / 2);

    });

    particleSystem.eachNode (function (node, pt)
    {
        var w = 10;
        ctx.fillStyle = "orange";
        ctx.fillRect (pt.x-w/2, pt.y-w/2, w,w);
        ctx.fillStyle = "black";
        ctx.font = 'italic 13px sans-serif';
        ctx.fillText (node.name, pt.x+8, pt.y+8);
    });       
   };

此代码期望在初始化时填充每条边的数据属性.

This code expected data property of each edge to be filled while initialization.

我使用自定义地图和方法 addNode/addEdge 手动创建所有节点和边，但我想您可以更改一些代码以通过这种方式使用自定义数据初始化边:

I create all nodes and edges manually using my custom map and methods addNode/addEdge, bu I suppose you can change a little your code to initialize edges with custom data this way:

var theUI = {
  nodes:{A:{color:"red", shape:"dot", alpha:1}, 
      B:{color:"#b2b19d", shape:"dot", alpha:1}, 
      C:{color:"#b2b19d", shape:"dot", alpha:1}, 
      D:{color:"#b2b19d", shape:"dot", alpha:1},
  },
  edges:{
      A:{
          B:{length:.8, data:{name:"A->B"}},
          C:{length:.8, data:{name:"A->C"}},
          D:{length:.8, data:{name:"A->D"}}
           }
  }
}

PS:看看这个例子，我从中学到了很多它.

P.S.: take a look at this example, I learned a lot from it.

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