在d3.json中添加链接描述过渡

时间:2018-09-16 12:33:31

标签: javascript d3.js

我正在d3.json中制作可折叠的树状图。我正在Mike Bostock https://bl.ocks.org/mbostock/4339083的示例中进行工作。我想在此图表上添加链接描述。在此I want to add text on the link in D3.js tree graph的帮助下,我添加了链接描述。但是,当节点和链接由于折叠/展开而移动时,我添加的链接描述不会转换。

如何添加过渡到链接描述文本?

我现有的代码在

下方

    var margin = {top: 20, right: 120, bottom: 20, left: 120},
        width = 960 - margin.right - margin.left,
        height = 800 - margin.top - margin.bottom;
    
    var i = 0,
        duration = 750,
        root;
    
    var tree = d3.layout.tree()
        .size([height, width]);
    
    var diagonal = d3.svg.diagonal()
        .projection(function(d) { return [d.y, d.x]; });
    
    var svg = d3.select("body").append("svg")
        .attr("width", width + margin.right + margin.left)
        .attr("height", height + margin.top + margin.bottom)
      .append("g")
        .attr("transform", "translate(" + margin.left + "," + margin.top + ")");
    
    var flare = {"name": "node1", "children": [{"name": "node2", "children": [{"name": "node3", "children": [{"name": "node4", "children": [{"name": "node5"}, {"name": "node5"}, {"name": "node6"}, {"name": "node7"}]}, {"name": "node8"}]}, {"name": "node9", "children": [{"name": "node10"}, {"name": "node11"}]}, {"name": "node12", "children": [{"name": "node13"}]}, {"name": "node14"}, {"name": "node15"}, {"name": "node16"}, {"name": "node17"}]}, {"name": "node18"}, {"name": "node18"}, {"name": "node19"}]};
    
      root = flare;
      root.x0 = height / 2;
      root.y0 = 0;
    
      function collapse(d) {
        if (d.children) {
          d._children = d.children;
          d._children.forEach(collapse);
          d.children = null;
        }
      }
    
      root.children.forEach(collapse);
      update(root);
    
    
    d3.select(self.frameElement).style("height", "800px");
    
    function update(source) {
    
      // Compute the new tree layout.
      var nodes = tree.nodes(root).reverse(),
          links = tree.links(nodes);
    
      // Normalize for fixed-depth.
      nodes.forEach(function(d) { d.y = d.depth * 180; });
    
      // Update the nodes�
      var node = svg.selectAll("g.node")
          .data(nodes, function(d) { return d.id || (d.id = ++i); });
    
      // Enter any new nodes at the parent's previous position.
      var nodeEnter = node.enter().append("g")
          .attr("class", "node")
          .attr("transform", function(d) { return "translate(" + source.y0 + "," + source.x0 + ")"; })
          .on("click", click);
    
      nodeEnter.append("circle")
          .attr("r", 1e-6)
          .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });
    
      nodeEnter.append("text")
          .attr("x", function(d) { return d.children || d._children ? -10 : 10; })
          .attr("dy", ".35em")
          .attr("text-anchor", function(d) { return d.children || d._children ? "end" : "start"; })
          .text(function(d) { return d.name; })
          .style("fill-opacity", 1e-6);
    
      // Transition nodes to their new position.
      var nodeUpdate = node.transition()
          .duration(duration)
          .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
    
      nodeUpdate.select("circle")
          .attr("r", 4.5)
          .style("fill", function(d) { return d._children ? "lightsteelblue" : "#fff"; });
    
      nodeUpdate.select("text")
          .style("fill-opacity", 1);
    
      // Transition exiting nodes to the parent's new position.
      var nodeExit = node.exit().transition()
          .duration(duration)
          .attr("transform", function(d) { return "translate(" + source.y + "," + source.x + ")"; })
          .remove();
    
      nodeExit.select("circle")
          .attr("r", 1e-6);
    
      nodeExit.select("text")
          .style("fill-opacity", 1e-6);
    
      // Update the links�
      var link = svg.selectAll("path.link")
          .data(links, function(d) { return d.target.id; });
    
      // Enter any new links at the parent's previous position.
      link.enter().insert("path", "g")
          .attr("class", "link")
          .attr("d", function(d) {
            var o = {x: source.x0, y: source.y0};
            return diagonal({source: o, target: o});
          });
    
      // Transition links to their new position.
      link.transition()
          .duration(duration)
          .attr("d", diagonal);
    
    
      // Transition exiting nodes to the parent's new position.
      link.exit().transition()
          .duration(duration)
          .attr("d", function(d) {
            var o = {x: source.x, y: source.y};
            return diagonal({source: o, target: o});
          })
          .remove();
      var linkg = link.enter();
      //add text attribute to link
      linkg.append("text")
          .attr("font-family", "Arial, Helvetica, sans-serif")
          .attr("fill", "Black")
          .style("font", "normal 12px Arial")
          .attr("transform", function(d) {
              return "translate(" +
                  ((d.source.y + d.target.y)/2) + "," +
                  ((d.source.x + d.target.x)/2) + ")";
          })
          .attr("dy", ".35em")
          .attr("text-anchor", "middle")
          .text(function(d){return "link"});
   link.transition()
              .select("text")
              .duration(duration)
              .attr("transform", function(d) { return "translate(" + d.y + "," + d.x + ")"; });
              
   link.exit().transition()
      .duration(duration)
      .select("text")
      .remove();

      // Stash the old positions for transition.
      nodes.forEach(function(d) {
        d.x0 = d.x;
        d.y0 = d.y;
      });
    }
    
    // Toggle children on click.
    function click(d) {
      if (d.children) {
        d._children = d.children;
        d.children = null;
      } else {
        d.children = d._children;
        d._children = null;
      }
      update(d);
    }
    .node {
      cursor: pointer;
    }
    
    .node circle {
      fill: #fff;
      stroke: steelblue;
      stroke-width: 1.5px;
    }
    
    .node text {
      font: 10px sans-serif;
    }
    
    .link {
      fill: none;
      stroke: #ccc;
      stroke-width: 1.5px;
    }
    <script src="http://d3js.org/d3.v3.min.js"></script>

1 个答案:

答案 0 :(得分:0)

我使用以下代码添加了链接文本和动画

svg.selectAll("text#link").remove();
    links.forEach(function(d){
        yy = (d.source.y + d.target.y)/2;
        xx = (d.source.x + d.target.x)/2;
      svg.append("text")
          .attr("font-family", "Arial, Helvetica, sans-serif")
          .attr("fill", "Black")
          .attr ("id", "link")  
          .style("font", "normal 12px Arial")
          .attr("transform", function(d) {
              return "translate(" +
                  yy + "," +
                  xx + ")";
          })
          .attr("dy", ".35em")
          .attr("text-anchor", "middle")
          .text("link")});