D3 Examples - node viz

xxxxxxxxxx
 
<!DOCTYPE html>
<meta charset="utf-8">
<style>
​
.node circle {
  cursor: pointer;
  stroke: #3182bd;
  stroke-width: 1.5px;
}
​
.node text {
  font: 10px sans-serif;
  pointer-events: none;
  text-anchor: middle;
}
​
line.link {
  fill: none;
  stroke: #9ecae1;
  stroke-width: 1.5px;
}
​
</style>
<body>
<script src="//d3js.org/d3.v3.min.js"></script>
<script>
​
var width = 1500,
    height = 1000,
    root;
​
var force = d3.layout.force()
    .linkDistance(250)
    .charge(-120)
    .gravity(.005)
    .size([width, height])
    .on("tick", tick);
​
var svg = d3.select("body").append("svg")
    .attr("width", width)
    .attr("height", height);
​
var link = svg.selectAll(".link"),
    node = svg.selectAll(".node");
    
​
    
​
​
d3.json("genome.json", function(error, json) {
  if (error) throw error;
​
  root = json;
  update();
});
​
​
​
function update() {
  var nodes = flatten(root),
      links = d3.layout.tree().links(nodes);
  // Restart the force layout.
  force
      .nodes(nodes)
      .links(links)
      .start();
​
  // Update links.
  link = link.data(links, function(d) { return d.target.id; });
​
  link.exit().remove();
​
  link.enter().insert("line", ".node")
      .attr("class", "link");
​
  // Update nodes.
  node = node.data(nodes, function(d) { return d.id; });
​
  node.exit().remove();
​
  var nodeEnter = node.enter().append("g")
      .attr("class", "node")
      .on("click", click)
      .call(force.drag);
​
  nodeEnter.append("circle")
      .attr("r", function(d) { return Math.sqrt(d.size) / 10 || 4.5; });
​
  nodeEnter.append("text")
      .attr("dy", ".35em")
      .text(function(d) { return d.name; });
​
  node.select("circle")
      .style("fill", color);
}
​
function tick() {
  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 + ")"; });
}
​
function color(d) {
  return d._children ? "#3182bd" // collapsed package
      : d.children ? "#c6dbef" // expanded package
      : "#fd8d3c"; // leaf node
}
​
// Toggle children on click.
function click(d) {
  if (d3.event.defaultPrevented) return; // ignore drag
  if (d.children) {
      collapseAll(d);
  } else {
      if (d._parent){
          d._parent.children.forEach(function(e){
              if (e != d){
                  collapseAll(e);
              }
          });
      }
    d.children = d._children;
    d._children = null;
  }
  update();
}
​
function collapseAll(d){
    if (d.children){
        d.children.forEach(collapseAll);
        d._children = d.children;
        d.children = null;
    }
    else if (d._children){
        d._children.forEach(collapseAll);
    }
}
​
// Returns a list of all nodes under the root.
function flatten(root) {
  var nodes = [], i = 0;
​
  function recurse(node) {
    if (node.children) node.children.forEach(recurse);
    if (!node.id) node.id = ++i;
    nodes.push(node);
  }
  recurse(root);
  return nodes;
}
​
function setParents(d, p){
    d._parent = p;
  if (d.children) {
      d.children.forEach(function(e){ setParents(e,d);});
  } else if (d._children) {
      d._children.forEach(function(e){ setParents(e,d);});
  }
}
​
​
​
</script>
    