text: var CodeFlower = function(selector, w, h, size) {
    this.w = w;
    this.h = h;
  
    this.size = size;
    this.overload = true;
  
    d3v3.select(selector).selectAll("svg").remove();
  
    this.svg = d3v3.select(selector).append("svg:svg")
      .attr('width', w)
      .attr('height', h);
  
    this.svg.append("svg:rect")
      .style("stroke", "#999")
      .style("fill", "#fff")
      .attr('width', w)
      .attr('height', h);
  
    this.force = d3v3.layout.force()
      .on("tick", this.tick.bind(this))
      .charge(function(d) { return d._children ? -d.size / 120 : -70; })
      .linkDistance(function(d) { return d.target._children ? 120 : 45; })
      .size([h, w]);
  };
  
  CodeFlower.prototype.update = function(json) {
    if (json) this.json = json;
    this.json.fixed = true;
    this.json.x = this.w / 2;
    this.json.y = this.h / 2;
  
    var nodes = this.flatten(this.json);
    this.nodes = nodes;
    var links = d3v3.layout.tree().links(nodes);
    var total = nodes.length || 1;
    this.total = total;
    this.links = links;
  
    // remove existing text (will readd it afterwards to be sure it's on top)
    this.svg.selectAll("text").remove();
  
    // Restart the force layout
    this.force
      .gravity(Math.atan(total / 50) / Math.PI * 0.2)
      .nodes(nodes)
      .links(links)
      .start();
  
    // Update the links
    this.link = this.svg.selectAll("line.link")
      .data(links, function(d) { return d.target.name; });
  
    // Enter any new links
    this.link.enter().insert("svg:line", ".node")
      .attr("class", "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; });
  
    // Exit any old links.
    this.link.exit().remove();
  
    // Update the nodes
    this.node = this.svg.selectAll("circle.node")
      .data(nodes, function(d) { return d.name; })
      .classed("collapsed", function(d) { return d._children ? 1 : 0; });
  
    this.node.transition()
      .attr("r", function(d) { return d.children ? 3.5 : Math.pow(d.size, 2/5) || 1; });
  
    // Enter any new nodes
    this.node.enter().append('svg:circle')
      .attr("class", "node")
      .classed('directory', function(d) { return (d._children || d.children) ? 1 : 0; })
      .attr("r", function(d) { return d.children ? 3.5 : Math.pow(d.size, 2/5) || 1; })
      .style("fill", function color(d) {
        return "hsl(" + parseInt(360 / total * d.id, 10) + ",90%,70%)";
      })
      .call(this.force.drag)
      .on("click", this.click.bind(this))
      .on("mouseover", this.mouseover.bind(this))
      .on("mouseout", this.mouseout.bind(this));
  
    // Exit any old nodes
    this.node.exit().remove();
  
    this.text = this.svg.append('svg:text')
      .attr('class', 'nodetext')
      .attr('dy', 0)
      .attr('dx', 0)
      .attr('text-anchor', 'middle');
  
    return this;
  };
  
  CodeFlower.prototype.flatten = function(root) {
    var nodes = [], i = 0;
  
    function recurse(node) {
      if (node.children) {
        node.size = node.children.reduce(function(p, v) {
          return p + recurse(v);
        }, 0);
      }
      if (!node.id) node.id = ++i;
      nodes.push(node);
      return node.size;
    }
  
    root.size = recurse(root);
    return nodes;
  };
  
  CodeFlower.prototype.click = function(d) {
    // Toggle children on click.
    if (d.children) {
      d._children = d.children;
      d.children = null;
    } else {
      d.children = d._children;
      d._children = null;
    }
  
    this.force
      .nodes(this.nodes)
      .links(this.links)
      .charge(function(d){
          var charge = -500;
          if (d.index === 0) charge = 3 * charge;
          
          return charge;
      });
  
    this.update();
  
    if (d.index >= 0) {
      console.log(d)
      displayTree(d, this.size, this.overload, flower=true);
      d3v3.select("#chart")
          .style("display", null)
    }
  };
  
  CodeFlower.prototype.mouseover = function(d) {
    this.text.attr('transform', 'translate(' + d.x + ',' + (d.y - 5 - (d.children ? 3.5 : Math.sqrt(d.size) / 2)) + ')')
      .text(d.name + ": " + d.size)
      .style("font-size", "12")
      .style('display', null);
  
  };
  
  CodeFlower.prototype.mouseout = function(d) {
    this.text.style('display', 'none');
  };
  
  CodeFlower.prototype.tick = function() {
    var h = this.h;
    var w = this.w;
    this.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; });
  
    this.node.attr("transform", function(d) {
      return "translate(" + Math.max(5, Math.min(w - 5, d.x)) + "," + Math.max(5, Math.min(h - 5, d.y)) + ")";
    });
  };
  
  CodeFlower.prototype.cleanup = function() {
    this.update([]);
    this.force.stop();
  };
  
  CodeFlower.prototype.collapseNode = function() {
      for(var i = 0; i < this.nodes.length; i++) {
          var d = this.nodes[i];
          if(d.name !== "root") {
              d._children = d.children;
              d.children = null;
          }
      }
  
      this.update();
  
      return;
  };