D3 Examples - A force-directed Graph of Relationships

A force-directed Graph of Relationships

This simple force-directed graph show the relationships to Elizabeth Bennet. A physical simulation of charged particles and springs places related characters in closer proximity, while unrelated characters are farther apart. Layout algorithm inspired by Tim Dwyer and Thomas Jakobsen.

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•<!DOCTYPE html>
<meta charset="utf-8">
<style>
    .node {
        stroke: #fff;
        stroke-width: 1.5px;
    }
​
    .link {
        stroke-opacity: .6;
    }
</style>
<body>
    <script src="https://d3js.org/d3.v4.min.js"></script>
    <script>
      
    var width = 960;
    var height = 500;
    var radius = 5;
    var colors =d3.scaleOrdinal(d3.schemeCategory10);
      
     var svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height);
​
    d3.json('links.json', function(err, data){
//       console.log(data);
      //position node with their group
//       var perRow = 2;
//       data.nodes.forEach(function(node){
//         node.focusX = (node.group % perRow)* 100;
//         node.focusY = Math.floor(node.group/ perRow) * 100;
//       });
       data.links.forEach(function(link) {
        link.source = data.nodes.find(function(node) {return node.id === link.source});
        link.target = data.nodes.find(function(node) {return node.id === link.target});
      });
      
      // one tick it's one iteration
      var simulations = d3.forceSimulation(data.nodes)
        .force('center', d3.forceCenter(width/2, height/2))
        .force('collide', d3.forceCollide(radius + 1))
//              .force('attraction', d3.forceManyBody().strength(100).distanceMin(150))
//          .force('repulsion', d3.forceManyBody().strength(-100).distanceMax(150))
        .force('x', d3.forceX().x(function(d){
          return d.focusX
        }))
        .force('y', d3.forceY().y(function(d){
                      return d.focusY     }))
//          .force('links', d3.forceLink(data.links)
//                .id(function(d){return d.id})
//                .strength(function(d){})
              
                                                
                                                    
        .on('tick', ticked);
      //create circle for each node, there's x and y got calculated each tick
       var links = svg.selectAll('line')
        .data(data.links, function(d){return d.source.id + ',' + d.target.id})
        .enter().append('line')
        .attr('stroke', '#ccc');
      
      var circles = svg.selectAll('circle')
        .data(data.nodes, function(d){return d.id})
        .enter().append('circle')
        .attr('r', radius)
        .attr('fill', function(d){return colors(d.group)})
//          .call(drag)
     
      
      
      function ticked() {
        circles
          .attr('cx', function(d) {return d.x})
            .attr('cy', function(d) {return d.y});
        
        links.attr('x1', function(d) {return d.source.x})
            .attr('x2', function(d){return d.target.x})
            .attr('y1', function(d) {return d.source.y})
            .attr('y2', function(d){return d.target.y})
        
      }
      
        
      })
​
      
​
    </script>
​
    