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              <div class="wrapper">
  <div class="content">
    <h1>Force Layout Repulsion</h1>
  </div>
</div>
<script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
            
          
!
            
              body {
      font-family: "Avenir", "Helvetica Neue", Helvetica, sans-serif;
      width: 100%;
      color: #000;
    }
    h1, h2 {
      text-transform: uppercase;
      text-align: center;
    }
    h1 {
      font-size: 48px;
      margin-top: 30px;
      margin-bottom: 0px;
    }
    h2 {
      font-size: 28px;
      color: #888;
    }

    /* SVG */
    svg.main {
      display: block;
      margin: 0 auto;
      margin-top: 30px;
    }
            
          
!
            
              
    var width = 960;
    var height = 480;

    // Create nodes
    var nodes = d3.range(200).map(function() {
      return { radius: Math.random() * 15 + 4 };
    });
    var root = nodes[0];
    var color = d3.scale.category20();

    root.radius = 0;
    root.fixed = true;

    // Define force layout
    var force = d3.layout.force()
      .gravity(0.08)
      .charge(function(d, i) { return i ? 0 : -2000; })
      .nodes(nodes)
      .size([width, height]);
    force.start();

    // Render
    var svg = d3.select(".wrapper")
      .append("svg")
      .attr("class", "main")
      .attr("width", width)
      .attr("height", height);

    svg.selectAll("circle")
      .data(nodes.slice(1))
      .enter()
      .append("circle")
      .attr("class", "node")
      .attr("r", function(d) { return d.radius; })
      .attr("fill", function(d, i) { return color(i % 4); });

    // Define `tick` event
    force.on("tick", function(event) {
      var q = d3.geom.quadtree(nodes);
      var i = 0;
      var n = nodes.length;

      // Visit every node invoking the `collide` callback function
      while (i < n) {
        q.visit(collide(nodes[i]));
        i++;
      }
      svg.selectAll("circle")
        .attr("cx", function(d) { return d.x; })
        .attr("cy", function(d) { return d.y; });
    });

    // Mousemove event handler
    svg.on("mousemove", function() {
      var m = d3.mouse(this);
      root.px = m[0];
      root.py = m[1];
      force.resume();
    });

    // Define collision
    function collide(node) {
      var r = node.radius + 16;
      var nx1 = node.x - r;
      var nx2 = node.x + r;
      var ny1 = node.y - r;
      var ny2 = node.y + r;

      return function(quad, x1, y1, x2, y2) {
        if (quad.point && (quad.point !== node)) {
          var x = node.x - quad.point.x;
          var y = node.y - quad.point.y;
          var l = Math.sqrt(x * x + y * y);
          var r = node.radius + quad.point.radius;

          if (l < r) {
            l = (l - r) / l * 0.5;
            node.x -= x *= l;
            node.y -= y *= l;
            quad.point.x += x;
            quad.point.y += y;
          }
        }
        return x1 > nx2 || x2 < nx1 || y1 > ny2 || y2 < ny1;
      };
    }
            
          
!
999px
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