問題描述

如何在 arbor.js 中為邊緣添加標簽它是一個圖形可視化庫.

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

假設 A 和 B 是節點，E 是邊一種粗略的方法是插入一個文本節點"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

但我不想這樣，有沒有其他辦法?

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

這是示例代碼

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 連接到 B、C 和 D.如何為邊緣提供標簽?

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

推薦答案

arbor.js 允許您編寫代碼來呈現整個圖形.您可以在渲染方法中做任何您想做的事情，包括繪制邊緣標題，您可以將其存儲在單獨的地圖中.

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.

只需用這種方式覆蓋 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);
    });       
   };

此代碼期望在初始化時填充每條邊的數據屬性.

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

我使用自定義地圖和方法 addNode/addEdge 手動創建所有節點和邊，但我想您可以更改一些代碼以通過這種方式使用自定義數據初始化邊:

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:看看這個例子，我從中學到了很多它.

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

這篇關于在 arbor.js 中為邊緣添加標簽(查詢插件)的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！