Javascript/ D3.js / 带有 label 的强制有向图

Question

I am trying to create a forced directed graph by using D3.我正在尝试使用 D3 创建一个强制有向图。 I have already created a graph with no labels, but once I tried to put label on graph, it messed up whole code and the graph doesn't even appear.我已经创建了一个没有标签的图表，但是一旦我尝试将 label 放在图表上，它就会弄乱整个代码并且图表甚至不会出现。 I wrote the code after checking several documents, but I don't know where to fix it anymore.我在检查了几个文档后编写了代码，但我不知道在哪里修复它了。 Anyone familiar with D3 would appreciate it if you could let me know which part of this code went wrong.如果您能告诉我这段代码的哪一部分出错了，任何熟悉 D3 的人都会感激不尽。

<html>

<head>
  <meta charset="utf-8">
  <title>D3 v5 force simulation</title>
  <style>
    text {
      font-family: sans-serif;
      font-size: 10px;
    }

  </style>
</head>

<body>
  <svg width="500" height="600"></svg>
  <script src="https://d3js.org/d3.v5.min.js"></script>
  <script>
 
  var nodesData = [
    {id:"Korea", "group": 1, "value": 10},
    {id:"USA", "group": 1, "value": 5},
    {id:"France", "group": 1, "value": 5},
    {id:"UK", "group": 1, "value": 5},
    {id:"Japan", "group": 1, "value": 20},
    {id:"Turkey", "group": 1, "value": 5},

  ]

  var linksData = [
    { "source": 'Korea', "target": 'USA'},
    { "source": 'UK', "target": 'USA' },
    { "source": 'France', "target": 'Turkey' },
    { "source": 'Korea', "target": 'UK' },
    { "source": 'Japan', "target": 'Turkey' },
    { "source": 'Japan', "target": 'Korea' }
  ]

<---added---->
 var svg = d3.select("svg"),
     width =  +svg.attr("width"),
     height = +svg.attr("height");

 <---changed---->
  var link = svg.append("g")
    .selectAll("line")
    .data(linksData)
    .enter()
    .append("line")
    .attr("stroke-width", 1)
    .attr("stroke", "black");


  <---changed---->
  var node = svg.append("g")
    .selectAll("g")
    .data(nodesData)
    .enter()
    .append("g")
    
<---changed---->
 var circles = node.append("circle")
    .data(nodesData)
    .attr("r", d => d.value)
    .attr("fill", "LightSalmon")
    .call(d3.drag()
      .on("start", dragstarted)
      .on("drag", dragged)
      .on("end", dragended));

<---added---->
var labels = node.append("text")
    .text(function(d){return d.id;});
    



  var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(200, 150));

  simulation
    .nodes(nodesData)
    .on("tick", ticked);

  simulation.force("link")
    .links(linksData);


  function ticked() {
    link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });
    node
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
  }


  function dragstarted(d) {
    if(!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
  }

  function dragged(d) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  function dragended(d) {
    if(!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
  }
  </script>
</body>

</html>

<Original Code - forced directed graph without label> To put label, I just changed few points. <原代码-无标签强制有向图> 放label，我只是改了几点。 Originally, node and link were set separately, but they were grouped together to put label.本来node和link是分开设置的，但是组合在一起放了label。

 <!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <title>D3 v5 force simulation</title>
</head>

<body>
  <svg width="400" height="300"></svg>
  <script src="https://d3js.org/d3.v5.min.js"></script>
  <script>
  // 1. Data
  var nodesData = [
    {id:"Korea", "group": 1, "value":10},
    {id:"USA", "group": 1,"value":5},
    {id:"France", "group": 1,"value":5},
    {id:"UK", "group": 1,"value":5},
    {id:"Japan", "group": 1,"value":20},
    {id:"Turkey", "group": 1,"value":5},

  ]

  var linksData = [
    { "source": 'Korea', "target": 'USA'},
    { "source": 'UK', "target": 'USA' },
    { "source": 'France', "target": 'Turkey' },
    { "source": 'Korea', "target": 'UK' },
    { "source": 'Japan', "target": 'Turkey' },
    { "source": 'Japan', "target": 'Korea' }
  ]

  // 2. svg
  var link = d3.select("svg")
    .selectAll("line")
    .data(linksData)
    .enter()
    .append("line")
    .attr("stroke-width", 1)
    .attr("stroke", "black");

  var node = d3.select("svg")
    .selectAll("circle")
    .data(nodesData)
    .enter()
    .append("circle")
    .attr("r", d=> d.value)
    .attr("fill", "LightSalmon")
    .call(d3.drag()
      .on("start", dragstarted)
      .on("drag", dragged)
      .on("end", dragended));

  // 3. forceSimulation
  var simulation = d3.forceSimulation()
    .force("link", d3.forceLink().id(function(d) { return d.id; }))
    .force("charge", d3.forceManyBody())
    .force("center", d3.forceCenter(200, 150));

  simulation
    .nodes(nodesData)
    .on("tick", ticked);

  simulation.force("link")
    .links(linksData);

  // 4. forceSimulation 
  function ticked() {
    link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });
    node
      .attr("cx", function(d) { return d.x; })
      .attr("cy", function(d) { return d.y; });
  }

  // 5. drag event
  function dragstarted(d) {
    if(!d3.event.active) simulation.alphaTarget(0.3).restart();
    d.fx = d.x;
    d.fy = d.y;
  }

  function dragged(d) {
    d.fx = d3.event.x;
    d.fy = d3.event.y;
  }

  function dragended(d) {
    if(!d3.event.active) simulation.alphaTarget(0);
    d.fx = null;
    d.fy = null;
  }
  </script>
</body>

</html>

Answer 1

Since your nodes are g elements, you need to use the transform property to move them around.由于您的节点是g元素，因此您需要使用transform属性来移动它们。 We use the translate(x,y) transformation which moves it around.我们使用translate(x,y)变换来移动它。

  function ticked() {
    link
      .attr("x1", function(d) { return d.source.x; })
      .attr("y1", function(d) { return d.source.y; })
      .attr("x2", function(d) { return d.target.x; })
      .attr("y2", function(d) { return d.target.y; });
    node
      .attr("transform", function(d) { return `translate(${d.x},${d.y})` });
  }

We're now translating the g elements, so call the drag handler on them directly:我们现在正在翻译g元素，所以直接调用它们的拖动处理程序：

  var node = svg.append("g")
    .selectAll("g")
    .data(nodesData)
    .enter()
    .append("g")
    .call(d3.drag()
      .on("start", dragstarted)
      .on("drag", dragged)
      .on("end", dragended));

 <head> <meta charset="utf-8"> <title>D3 v5 force simulation</title> <style> text { font-family: sans-serif; font-size: 10px; } </style> </head> <body> <svg width="500" height="600"></svg> <script src="https://d3js.org/d3.v5.min.js"></script> <script> var nodesData = [ {id:"Korea", "group": 1, "value": 10}, {id:"USA", "group": 1, "value": 5}, {id:"France", "group": 1, "value": 5}, {id:"UK", "group": 1, "value": 5}, {id:"Japan", "group": 1, "value": 20}, {id:"Turkey", "group": 1, "value": 5}, ] var linksData = [ { "source": 'Korea', "target": 'USA'}, { "source": 'UK', "target": 'USA' }, { "source": 'France', "target": 'Turkey' }, { "source": 'Korea', "target": 'UK' }, { "source": 'Japan', "target": 'Turkey' }, { "source": 'Japan', "target": 'Korea' } ] var svg = d3.select("svg"), width = +svg.attr("width"), height = +svg.attr("height"); var link = svg.append("g").selectAll("line").data(linksData).enter().append("line").attr("stroke-width", 1).attr("stroke", "black"); var node = svg.append("g").selectAll("g").data(nodesData).enter().append("g").call(d3.drag().on("start", dragstarted).on("drag", dragged).on("end", dragended)); var circles = node.append("circle").data(nodesData).attr("r", d => d.value).attr("fill", "LightSalmon") var labels = node.append("text").text(function(d){return d.id;}); var simulation = d3.forceSimulation().force("link", d3.forceLink().id(function(d) { return d.id; })).force("charge", d3.forceManyBody()).force("center", d3.forceCenter(200, 150)); simulation.nodes(nodesData).on("tick", ticked); simulation.force("link").links(linksData); function ticked() { link.attr("x1", function(d) { return d.source.x; }).attr("y1", function(d) { return d.source.y; }).attr("x2", function(d) { return d.target.x; }).attr("y2", function(d) { return d.target.y; }); node.attr("transform", function(d) { return `translate(${dx},${dy})` }); } function dragstarted(d) { if(.d3.event.active) simulation.alphaTarget(0.3);restart(). d.fx = d;xdfy = d;y. } function dragged(d) { d.fx = d3.event;xdfy = d3.event;y. } function dragended(d) { if(.d3.event;active) simulation.alphaTarget(0); d.fx = null; d.fy = null; } </script> </body> </html>

Javascript/ D3.js / 带有 label 的强制有向图

问题描述

1 个解决方案

解决方案1
1 已采纳 2020-08-17 07:12:58

Javascript/ D3.js / 带有 label 的强制有向图

问题描述

1 个解决方案

解决方案1 1 已采纳 2020-08-17 07:12:58

解决方案1
1 已采纳 2020-08-17 07:12:58