如何在树形图示例中的边缘上放置标签？ [英] How to put labels on the edges in the Dendrogram example?

问题描述

假设树形图像树状图示例（ source ），如何将标签放在边缘？绘制边缘的Javascript代码看起来像下面的行：

Given a tree diagram like the Dendrogram example (source), how would one put labels on the edges? The Javascript code to draw the edges looks like the next lines:

var link = vis.selectAll("path.link")
    .data(cluster.links(nodes))
  .enter().append("path")
    .attr("class", "link")
    .attr("d", diagonal);

推荐答案

D3的作者Mike Bostock与以下解决方案。定义g.link的样式;我只是复制g.node的样式。然后我用下面的代码替换var link = ....代码。 x和y函数将标签放在路径的中心。

Mike Bostock, the author of D3, very graciously helped with the following solution. Define a style for g.link; I just copied the style for g.node. Then I replaced the "var link =...." code with the following. The x and y functions place the label in the center of the path.

var linkg = vis.selectAll("g.link")
    .data(cluster.links(nodes))
    .enter().append("g")
    .attr("class", "link");

linkg.append("path")
    .attr("class", "link")
    .attr("d", diagonal);

linkg.append("text")
    .attr("x", function(d) { return (d.source.y + d.target.y) / 2; })
    .attr("y", function(d) { return (d.source.x + d.target.x) / 2; })
    .attr("text-anchor", "middle")
    .text(function(d) {
        return "edgeLabel";
    });

文本函数应该理想地为每个边提供一个标签。在准备我的数据时，我填充了一个对象的边缘名称，所以我的文本函数看起来像这样：

The text function should ideally provide a label specifically for each edge. I populated an object with the names of my edges while preparing my data, so my text function looks like this:

    .text(function(d) {
        var key = d.source.name + ":" + d.target.name;
        return edgeNames[key];
    });

这篇关于如何在树形图示例中的边缘上放置标签？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！