html 如何在D3.JS中更改树图中节点之间的线宽

3lxsmp7m 于 2023-05-05 发布在其他

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我试图通过D3.JS的树图（特别是Mike Bostock的可折叠树图链接here的版本）Map调查数据二进制问题。
这里的想法是，我希望节点之间的线条宽度根据回答该问题答案的调查受访者的数量进行缩放（例如：父节点=问题1，并且“是”响应等于子节点1，“否”响应等于子节点2，并且父节点和子节点之间的线的宽度等于选择该响应的人口的比例）。
有什么建议吗？让我知道这是否有意义--请参阅下面的示例数据结构和基本树。
谢谢！
初始数据结构如下所示：
{ "name": "Question", "children": [ { "name": "Yes", }, { "name": "No" } ] };
Basic tree looks like this

Html

来源：https://stackoverflow.com/questions/76075430/how-to-change-width-of-line-between-nodes-in-tree-diagram-in-d3-js

1条答案

按热度按时间

kcugc4gi1#

下面演示了如何调整树图示例的笔划宽度，应该会让你朝着正确的方向开始。
根据代码示例的'styling version'，您可以向数据添加笔划宽度（这里称为厚度）的质量;

var treeData =
  {
    "name": "Top Level",
    "value": 10,
    "type": "black",
    "level": "red",
    "thickness": 2,
    "children": [
      {
        "name": "Level 2: A",
        "value": 15,
        "type": "grey",
        "level": "red",
        "thickness": 4,
        "children": [
          {
            "name": "Son of A",
            "value": 5,
            "type": "steelblue",
            "thickness": 6,
            "level": "orange"
          },
          {
            "name": "Daughter of A",
            "value": 8,
            "type": "steelblue",
            "thickness": 1,
            "level": "red"
          }
        ]
      },
      {
        "name": "Level 2: B",
        "value": 10,
        "type": "grey",
        "thickness": 5,
        "level": "green"
      }
    ]
  };

然后在绘制链接时调用它;

var link = g.selectAll(".link")
    .data( nodes.descendants().slice(1))
  .enter().append("path")
    .attr("class", "link")
    .style("stroke", function(d) { return d.data.level; })
    .style("stroke-width", function(d) { return d.data.thickness; })
    .attr("d", function(d) {
       return "M" + d.y + "," + d.x
         + "C" + (d.y + d.parent.y) / 2 + "," + d.x
         + " " + (d.y + d.parent.y) / 2 + "," + d.parent.x
         + " " + d.parent.y + "," + d.parent.x;
       });

请记住，我已经重复了d3.js v4的例子，你可能会考虑迁移到v7（updated example of the styling code）。

**更新：**这里是交互式示例的完整代码，具有不同的链接厚度

<!DOCTYPE html>
<meta charset="UTF-8">
<style>

.node circle {
  fill: #fff;
  stroke: steelblue;
  stroke-width: 3px;
}

.node text {
  font: 12px sans-serif;
}

.link {
  fill: none;
  stroke: #ccc;
  stroke-width: 2px;
}

</style>

<body>

<!-- load the d3.js library --> 
<script src="https://d3js.org/d3.v4.min.js"></script>
<script>


var treeData = 
  {
    "name": "Top Level",
    "thickness": 4,
    "children": [
      {
        "name": "Level 2: A",
        "thickness": 3,
        "children": [
          {
            "name": "Son of A",
            "thickness": 2
          },
          {
            "name": "Daughter of A",
            "thickness": 1
          }
        ]
      },
      {
        "name": "Level 2: B",
        "thickness": 6
      }
    ]
  };


// Set the dimensions and margins of the diagram
var margin = {top: 20, right: 90, bottom: 30, left: 90},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

// append the svg object to the body of the page
// appends a 'group' element to 'svg'
// moves the 'group' element to the top left margin
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 i = 0,
    duration = 750,
    root;

// declares a tree layout and assigns the size
var treemap = d3.tree().size([height, width]);

// Assigns parent, children, height, depth
root = d3.hierarchy(treeData, function(d) { return d.children; });
root.x0 = height / 2;
root.y0 = 0;

// Collapse after the second level
root.children.forEach(collapse);

update(root);

// Collapse the node and all it's children
function collapse(d) {
  if(d.children) {
    d._children = d.children
    d._children.forEach(collapse)
    d.children = null
  }
}

function update(source) {

  // Assigns the x and y position for the nodes
  var treeData = treemap(root);

  // Compute the new tree layout.
  var nodes = treeData.descendants(),
      links = treeData.descendants().slice(1);

  // Normalize for fixed-depth.
  nodes.forEach(function(d){ d.y = d.depth * 180});

  // ****************** Nodes section ***************************

  // Update the nodes...
  var node = svg.selectAll('g.node')
      .data(nodes, function(d) {return d.id || (d.id = ++i); });

  // Enter any new modes 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);

  // Add Circle for the nodes
  nodeEnter.append('circle')
      .attr('class', 'node')
      .attr('r', 1e-6)
      .style("fill", function(d) {
          return d._children ? "lightsteelblue" : "#fff";
      });

  // Add labels for the nodes
  nodeEnter.append('text')
      .attr("dy", ".35em")
      .attr("x", function(d) {
          return d.children || d._children ? -13 : 13;
      })
      .attr("text-anchor", function(d) {
          return d.children || d._children ? "end" : "start";
      })
      .text(function(d) { return d.data.name; });

  // UPDATE
  var nodeUpdate = nodeEnter.merge(node);

  // Transition to the proper position for the node
  nodeUpdate.transition()
    .duration(duration)
    .attr("transform", function(d) { 
        return "translate(" + d.y + "," + d.x + ")";
     });

  // Update the node attributes and style
  nodeUpdate.select('circle.node')
    .attr('r', 10)
    .style("fill", function(d) {
        return d._children ? "lightsteelblue" : "#fff";
    })
    .attr('cursor', 'pointer');

  // Remove any exiting nodes
  var nodeExit = node.exit().transition()
      .duration(duration)
      .attr("transform", function(d) {
          return "translate(" + source.y + "," + source.x + ")";
      })
      .remove();

  // On exit reduce the node circles size to 0
  nodeExit.select('circle')
    .attr('r', 1e-6);

  // On exit reduce the opacity of text labels
  nodeExit.select('text')
    .style('fill-opacity', 1e-6);

  // ****************** links section ***************************

  // Update the links...
  var link = svg.selectAll('path.link')
      .data(links, function(d) { return d.id; });

  // Enter any new links at the parent's previous position.
  var linkEnter = link.enter().insert('path', "g")
      .attr("class", "link")
      .style("stroke-width", function(d) { return d.data.thickness; })
      .attr('d', function(d){
        var o = {x: source.x0, y: source.y0}
        return diagonal(o, o)
      });

  // UPDATE
  var linkUpdate = linkEnter.merge(link);

  // Transition back to the parent element position
  linkUpdate.transition()
      .duration(duration)
      .attr('d', function(d){ return diagonal(d, d.parent) });

  // Remove any exiting links
  var linkExit = link.exit().transition()
      .duration(duration)
      .attr('d', function(d) {
        var o = {x: source.x, y: source.y}
        return diagonal(o, o)
      })
      .remove();

  // Store the old positions for transition.
  nodes.forEach(function(d){
    d.x0 = d.x;
    d.y0 = d.y;
  });

  // Creates a curved (diagonal) path from parent to the child nodes
  function diagonal(s, d) {

    path = `M ${s.y} ${s.x}
            C ${(s.y + d.y) / 2} ${s.x},
              ${(s.y + d.y) / 2} ${d.x},
              ${d.y} ${d.x}`

    return path
  }

  // 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);
  }
}

</script>
</body>

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html 如何在D3.JS中更改树图中节点之间的线宽

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