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datalets/treemap-datalet/js/buildtreemap.js 6.13 KB
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  /**

   * Created by Utente on 17/07/2015.

   */

  

  function build(root, place_holder) {

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          var plwidth  = $(place_holder).width();

          var plheight = $(place_holder).height();

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      var margin = {top: 20, right: 0, bottom: 0, left: 0},

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          width  = plwidth,

          height =  plheight - margin.top - margin.bottom,

          formatNumber = d3.format(",d"),

          transitioning;

  

      var x = d3.scale.linear()

          .domain([0, width])

          .range([0, width]);

  

      var y = d3.scale.linear()

          .domain([0, height])

          .range([0, height]);

  

      var treemap = d3.layout.treemap()

          .children(function(d, depth) { return depth ? null : d._children; })

          .sort(function(a, b) { return a.value - b.value; })

          .ratio(height / width * 0.5 * (1 + Math.sqrt(5)))

          .round(false);

  

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      var svg = d3.select(place_holder).append("svg")

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          .attr("width", width + margin.left + margin.right)

          .attr("height", height + margin.bottom + margin.top)

          .style("margin-left", -margin.left + "px")

          .style("margin.right", -margin.right + "px")

          .append("g")

          .attr("transform", "translate(" + margin.left + "," + margin.top + ")")

          .style("shape-rendering", "crispEdges");

  

      var grandparent = svg.append("g")

          .attr("class", "grandparent");

  

      grandparent.append("rect")

          .attr("y", -margin.top)

          .attr("width", width)

          .attr("height", margin.top);

  

      grandparent.append("text")

          .attr("x", 6)

          .attr("y", 6 - margin.top)

          .attr("dy", ".75em");

  

      //d3.json

      initialize(root);

      accumulate(root);

      layout(root);

      display(root);

  

      function initialize(root) {

          root.x = root.y = 0;

          root.dx = width;

          root.dy = height;

          root.depth = 0;

      }

  

      // Aggregate the values for internal nodes. This is normally done by the

      // treemap layout, but not here because of our custom implementation.

      // We also take a snapshot of the original children (_children) to avoid

      // the children being overwritten when when layout is computed.

      function accumulate(d) {

          return (d._children = d.children)

              ? d.value = d.children.reduce(function(p, v) { return p + accumulate(v); }, 0)

              : d.value;

      }

  

      // Compute the treemap layout recursively such that each group of siblings

      // uses the same size (1×1) rather than the dimensions of the parent cell.

      // This optimizes the layout for the current zoom state. Note that a wrapper

      // object is created for the parent node for each group of siblings so that

      // the parent’s dimensions are not discarded as we recurse. Since each group

      // of sibling was laid out in 1×1, we must rescale to fit using absolute

      // coordinates. This lets us use a viewport to zoom.

      function layout(d) {

          if (d._children) {

              treemap.nodes({_children: d._children});

              d._children.forEach(function(c) {

                  c.x = d.x + c.x * d.dx;

                  c.y = d.y + c.y * d.dy;

                  c.dx *= d.dx;

                  c.dy *= d.dy;

                  c.parent = d;

                  layout(c);

              });

          }

      }

  

      function display(d) {

          grandparent

              .datum(d.parent)

              .on("click", transition)

              .select("text")

              .text(name(d));

  

          var g1 = svg.insert("g", ".grandparent")

              .datum(d)

              .attr("class", "depth");

  

          var g = g1.selectAll("g")

              .data(d._children)

              .enter().append("g");

  

          g.filter(function(d) { return d._children; })

              .classed("children", true)

              .on("click", transition);

  

          g.selectAll(".child")

              .data(function(d) { return d._children || [d]; })

              .enter().append("rect")

              .attr("class", "child")

              .call(rect);

  

          g.append("rect")

              .attr("class", "parent")

              .call(rect)

              .append("title")

              .text(function(d) { return formatNumber(d.value); });

  

          g.append("text")

              .attr("dy", ".75em")

              .text(function(d) { return d.name; })

              .call(text);

  

          function transition(d) {

              if (transitioning || !d) return;

              transitioning = true;

  

              var g2 = display(d),

                  t1 = g1.transition().duration(750),

                  t2 = g2.transition().duration(750);

  

              // Update the domain only after entering new elements.

              x.domain([d.x, d.x + d.dx]);

              y.domain([d.y, d.y + d.dy]);

  

              // Enable anti-aliasing during the transition.

              svg.style("shape-rendering", null);

  

              // Draw child nodes on top of parent nodes.

              svg.selectAll(".depth").sort(function(a, b) { return a.depth - b.depth; });

  

              // Fade-in entering text.

              g2.selectAll("text").style("fill-opacity", 0);

  

              // Transition to the new view.

              t1.selectAll("text").call(text).style("fill-opacity", 0);

              t2.selectAll("text").call(text).style("fill-opacity", 1);

              t1.selectAll("rect").call(rect);

              t2.selectAll("rect").call(rect);

  

              // Remove the old node when the transition is finished.

              t1.remove().each("end", function() {

                  svg.style("shape-rendering", "crispEdges");

                  transitioning = false;

              });

          }

  

          return g;

      }

  

      function text(text) {

          text.attr("x", function(d) { return x(d.x) + 6; })

              .attr("y", function(d) { return y(d.y) + 6; });

      }

  

      function rect(rect) {

          rect.attr("x", function(d) { return x(d.x); })

              .attr("y", function(d) { return y(d.y); })

              .attr("width", function(d) { return x(d.x + d.dx) - x(d.x); })

              .attr("height", function(d) { return y(d.y + d.dy) - y(d.y); });

      }

  

      function name(d) {

          return d.parent

              ? name(d.parent) + "." + d.name

              : d.name;

      }

  };