block by emeeks a11894593fcae32ac361e5c2debfdec5

Gooey Sankey

Full Screen

A sankey diagram where connection between nodes are represented by goo.

index.html


<!DOCTYPE html>

<html lang="en">
<head>
<meta charset="utf-8" />
<title>Gooey Sankey</title>
<style>
.node rect {
  cursor: move;
  fill-opacity: .9;
  shape-rendering: crispEdges;
}

.node text {
  pointer-events: none;
  text-shadow: 0 1px 0 #fff;
}

.link {
  fill: none;
}

svg {
  position: absolute;
}

canvas {
  position: absolute;
}


</style>
</head>
<body>
<canvas width="1000" height="1000" ></canvas>
<svg width="1000" height="1000" ></svg>

<script src="https://cdnjs.cloudflare.com/ajax/libs/d3/3.5.16/d3.min.js" charset="utf-8" type="text/javascript"></script>
<script src="d3.sankey.js" charset="utf-8" type="text/javascript"></script>
<script src="d3-glyphEdge.js" charset="utf-8" type="text/javascript"></script>

    <script type="text/javascript">

var margin = {top: 1, right: 1, bottom: 6, left: 1},
    width = 960 - margin.left - margin.right,
    height = 500 - margin.top - margin.bottom;

var formatNumber = d3.format(",.0f"),
    format = function(d) { return formatNumber(d) + " TWh"; },
    color = d3.scale.category20b();

var svg = d3.select("svg")
    .attr("width", width + margin.left + margin.right)
    .attr("height", height + margin.top + margin.bottom)

  var filter = d3.select("svg").append("defs").append("filter").attr("id", "gooeyCodeFilter");
  filter.append("feGaussianBlur").attr("id", "gaussblurrer").attr("in", "SourceGraphic").attr("stdDeviation", 6).attr("color-interpolation-filters", "sRGB").attr("result", "blur");
  filter.append("feColorMatrix").attr("in", "blur").attr("mode", "matrix").attr("values", "1 0 0 0 0  0 1 0 0 0  0 0 1 0 0  0 0 0 34 -7").attr("result", "gooey");


 var unfilteredbaseG = d3.select("svg").append("g")
  .attr("class", "bg")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")

  svg = svg.append("g")
    .attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    .style("filter", "url(#gooeyCodeFilter)")

var sankey = d3.sankey()
    .nodeWidth(15)
    .nodePadding(10)
    .size([width, height]);

var path = sankey.link();

var freqCounter = 1;


d3.json("energy.json", function(energy) {

  energy.links.forEach(function (d) {
    d.o_value = d.value;
    d.value = 1;
  })

  sankey
      .nodes(energy.nodes)
      .links(energy.links)
      .layout(32);

  var linkExtent = d3.extent(energy.links, function (d) {return d.o_value});
  var frequencyScale = d3.scale.linear().domain(linkExtent).range([0.01,0.5]);
  var particleSize = d3.scale.linear().domain(linkExtent).range([1,5]);
  unfilteredbaseG.selectAll("path.link")
      .data(energy.links)
      .enter()
      .append("path")
      .attr("d", path)
      .style("stroke", "lightgray")
      .style("fill", "none")
      .style("stroke-opacity", 0.25)
      .style("stroke-width", function(d) { return Math.max(1, d.dy); })
      .each(function (link) {
        link.particleSize = 3;
        link.particleColor = link.source.color;

        link.particles = [];
        link.frequency = frequencyScale(link.o_value);
        link.speed = (Math.random() + 1) * 5;
      })


  var linkG = svg
      .selectAll("g.link")
      .data(energy.links)
      .enter()
      .append("g")
      .attr("class", "link")

      d3.selectAll("g.link")
      .append("path")
      .attr("d", path)
      .style("stroke", "none")
      .style("stroke-width", function(d) { return Math.max(1, d.dy); })
      .each(function (link) {
        link.particleSize = 3;
        link.particleColor = link.source.color;

        link.particles = [];
        link.frequency = frequencyScale(link.o_value);
        link.speed = Math.random() + 1;
      })


  var node = svg.append("g").selectAll(".node")
      .data(energy.nodes)
    .enter().append("g")
      .attr("class", "node")
      .attr("transform", function(d) { return "translate(" + d.x + "," + d.y + ")"; })
    .call(d3.behavior.drag()
      .origin(function(d) { return d; })
      .on("dragstart", function() { this.parentNode.appendChild(this); })
      .on("drag", dragmove));

  node.append("rect")
      .attr("height", function(d) { return d.dy; })
      .attr("width", sankey.nodeWidth())
      .style("fill", function(d) { return d.color = color(d.name.replace(/ .*/, "")); })
      .style("stroke", "none")
    .append("title")
      .text(function(d) { return d.name + "\n" + format(d.o_value); });

  function dragmove(d) {
    d3.select(this).attr("transform", "translate(" + d.x + "," + (d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))) + ")");
    sankey.relayout();
    d3.selectAll("g.link > path").attr("d", path);
  }

  var start

  function step(timestamp) {
    particles();
    window.requestAnimationFrame(step);
  }

  window.requestAnimationFrame(step);

function particles() {
    d3.selectAll("g.link")
      .each(function (d, i) {
          d3_glyphEdge.mutate.particle(d, d3.select(this).select("path").node(), d.frequency, d.speed);
          d3.select(this).selectAll("circle")
            .data(d.particles)
            .enter()
            .append("circle")
            .style("fill", d.source.color)
            .attr("r", 5);

          d3.select(this).selectAll("circle")
            .data(d.particles)
            .exit()
            .remove();

          d3.select(this).selectAll("circle")
            .attr("cx", function (p) {return p.x})
            .attr("cy", function (p) {return p.y});
      })

}

});

    </script>
</body>
</html>

d3-glyphEdge.js

(function (global, factory) {
        typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports) :
        typeof define === 'function' && define.amd ? define('d3-glyphEdge', ['exports'], factory) :
        factory((global.d3_glyphEdge = {}));
}(this, function (exports) { 'use strict';

        function halfArrow(d, nodeTargetSize, bodySize, headSize) {
            var diffX = d.target.y - d.source.y;
            var diffY = d.target.x - d.source.x;

            var headDistance = headSize * 3;

            var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
            var angle1 = angle0 - ( Math.PI / 2 );
            var angle2 = angle0 + ( Math.PI / 2 );

            var x1 = d.source.x + (headSize * Math.cos(angle1));
            var y1 = d.source.y - (headSize * Math.sin(angle1));
            var x2 = d.source.x + (headSize * Math.cos(angle2));
            var y2 = d.source.y - (headSize * Math.sin(angle2));
            
            var x3 = d.target.x - (headSize * Math.cos(angle1));
            var y3 = d.target.y + (headSize * Math.sin(angle1));

            var mx1 = d.source.x + (bodySize * Math.cos(angle1));
            var my1 = d.source.y - (bodySize * Math.sin(angle1));
            var mx2 = d.source.x + (bodySize * Math.cos(angle2));
            var my2 = d.source.y - (bodySize * Math.sin(angle2));

            var mx3 = d.target.x + (bodySize * Math.cos(angle1));
            var my3 = d.target.y - (bodySize * Math.sin(angle1));

            var dY = d.source.y - d.target.y;
            var dX = d.source.x - d.target.x;

            var midDiffY1 = my1 - my3;
            var midDiffX1 = mx1 - mx3;

            var diffY1 = y1 - y3;
            var diffX1 = x1 - x3;

            var pythag = Math.sqrt((midDiffX1 * midDiffX1) + (midDiffY1 * midDiffY1));
            var pythag2 = Math.sqrt((dX * dX) + (dY * dY));

            var adjX1 = mx2 - ((midDiffX1 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var adjY1 = my2 - ((midDiffY1 * (pythag - headDistance - nodeTargetSize)) / pythag);

            var headX1 = x2 - ((diffX1 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var headY1 = y2 - ((diffY1 * (pythag - headDistance - nodeTargetSize)) / pythag);

            var tipX = d.source.x - ((dX * (pythag2 - nodeTargetSize)) / pythag2);
            var tipY = d.source.y - ((dY * (pythag2 - nodeTargetSize)) / pythag2);

            return "M" + d.source.x + "," + d.source.y + "L" + mx2 + "," + my2 + "L" + adjX1 + "," + adjY1 + "L" + headX1 + "," + headY1 + "L" + tipX + "," + tipY + "L" + d.source.x + "," + d.source.y + "z";
        };

        function lineArc(d) {
          var dx = d.target.x - d.source.x,
              dy = d.target.y - d.source.y,
              dr = Math.sqrt(dx * dx + dy * dy);
          return "M" + d.source.x + "," + d.source.y + "A" + dr + "," + dr + " 0 0,1 " + d.target.x + "," + d.target.y;
        };

        function ribbon(d, bodySize) {
                var diffX = d.target.y - d.source.y;
                var diffY = d.target.x - d.source.x;

                var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
                var angle1 = angle0 - ( Math.PI / 2 );
                var angle2 = angle0 + ( Math.PI / 2 );

                var mx1 = d.source.x + (bodySize * Math.cos(angle1));
                var my1 = d.source.y - (bodySize * Math.sin(angle1));
                var mx2 = d.source.x + (bodySize * Math.cos(angle2));
                var my2 = d.source.y - (bodySize * Math.sin(angle2));

                var mx3 = d.target.x - (bodySize * Math.cos(angle1));
                var my3 = d.target.y + (bodySize * Math.sin(angle1));
                var mx4 = d.target.x - (bodySize * Math.cos(angle2));
                var my4 = d.target.y + (bodySize * Math.sin(angle2));

                return "M" + mx1 + "," + my1 + "L" + mx2 + "," + my2 + "L" + mx3 + "," + my3 + "L" + mx4 + "," + my4 + "z";
        }

        function taffy(d, nodeSourceSize, nodeTargetSize, midpointSize) {
            var diffX = d.target.y - d.source.y;
            var diffY = d.target.x - d.source.x;

            var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
            var angle1 = angle0 - ( Math.PI / 2 );
            var angle2 = angle0 + ( Math.PI / 2 );

            var x1 = d.source.x + (nodeSourceSize * Math.cos(angle1));
            var y1 = d.source.y - (nodeSourceSize * Math.sin(angle1));
            var x2 = d.source.x + (nodeSourceSize * Math.cos(angle2));
            var y2 = d.source.y - (nodeSourceSize * Math.sin(angle2));

            var x3 = d.target.x + (nodeTargetSize * Math.cos(angle2));
            var y3 = d.target.y - (nodeTargetSize * Math.sin(angle2));
            var x4 = d.target.x + (nodeTargetSize * Math.cos(angle1));
            var y4 = d.target.y - (nodeTargetSize * Math.sin(angle1));

            var mx1 = d.source.x + (midpointSize * Math.cos(angle1));
            var my1 = d.source.y - (midpointSize * Math.sin(angle1));
            var mx2 = d.source.x + (midpointSize * Math.cos(angle2));
            var my2 = d.source.y - (midpointSize * Math.sin(angle2));

            var mx3 = d.target.x + (midpointSize * Math.cos(angle1));
            var my3 = d.target.y - (midpointSize * Math.sin(angle1));
            var mx4 = d.target.x + (midpointSize * Math.cos(angle2));
            var my4 = d.target.y - (midpointSize * Math.sin(angle2));

            var midY2 = (my1 + my3) / 2;
            var midX2 = (mx1 + mx3) / 2;
            var midY1 = (my2 + my4) / 2;
            var midX1 = (mx2 + mx4) / 2;

            return "M" + x1 + "," + y1 + "L" + x2 + "," + y2 + " L " + midX1 + "," + midY1 + " L " + x3 + "," + y3 + " L " + x4 + "," + y4 + " L " + midX2 + "," + midY2 + "z";
        };

        function nail(d, nodeSize) {
            var diffX = d.target.y - d.source.y;
            var diffY = d.target.x - d.source.x;

            var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
            var angle1 = angle0 - ( Math.PI / 2 );
            var angle2 = angle0 + ( Math.PI / 2 );

            var x1 = d.source.x + (nodeSize * Math.cos(angle1));
            var y1 = d.source.y - (nodeSize * Math.sin(angle1));
            var x2 = d.source.x + (nodeSize * Math.cos(angle2));
            var y2 = d.source.y - (nodeSize * Math.sin(angle2));

            return "M" + x1 + "," + y1 + "L" + x2 + "," + y2 + " L " + d.target.x + "," + d.target.y + "z";
        };

        function comet(d, nodeSize) {
            var diffX = d.target.y - d.source.y;
            var diffY = d.target.x - d.source.x;

            var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
            var angle1 = angle0 - ( Math.PI / 2 );
            var angle2 = angle0 + ( Math.PI / 2 );

            var x1 = d.target.x + (nodeSize * Math.cos(angle1));
            var y1 = d.target.y - (nodeSize * Math.sin(angle1));
            var x2 = d.target.x + (nodeSize * Math.cos(angle2));
            var y2 = d.target.y - (nodeSize * Math.sin(angle2));

            return "M" + x1 + "," + y1 + "L" + x2 + "," + y2 + " L " + d.source.x + "," + d.source.y + "z";
        };

        function arrowhead(d, nodeTargetSize, bodySize, headSize) {
            var diffX = d.target.y - d.source.y;
            var diffY = d.target.x - d.source.x;

            var headDistance = headSize * 3;

            var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
            var angle1 = angle0 - ( Math.PI / 2 );
            var angle2 = angle0 + ( Math.PI / 2 );

            var x1 = d.source.x + (headSize * Math.cos(angle1));
            var y1 = d.source.y - (headSize * Math.sin(angle1));
            var x2 = d.source.x + (headSize * Math.cos(angle2));
            var y2 = d.source.y - (headSize * Math.sin(angle2));

            var x3 = d.target.x - (headSize * Math.cos(angle1));
            var y3 = d.target.y + (headSize * Math.sin(angle1));
            var x4 = d.target.x - (headSize * Math.cos(angle2));
            var y4 = d.target.y + (headSize * Math.sin(angle2));

            var mx1 = d.source.x + (bodySize * Math.cos(angle1));
            var my1 = d.source.y - (bodySize * Math.sin(angle1));
            var mx2 = d.source.x + (bodySize * Math.cos(angle2));
            var my2 = d.source.y - (bodySize * Math.sin(angle2));

            var mx3 = d.target.x + (bodySize * Math.cos(angle1));
            var my3 = d.target.y - (bodySize * Math.sin(angle1));
            var mx4 = d.target.x + (bodySize * Math.cos(angle2));
            var my4 = d.target.y - (bodySize * Math.sin(angle2));

            var dY = d.source.y - d.target.y;
            var dX = d.source.x - d.target.x;

            var midDiffY1 = my1 - my3;
            var midDiffX1 = mx1 - mx3;
            var midDiffY2 = my2 - my4;
            var midDiffX2 = mx2 - mx4;

            var diffY1 = y1 - y3;
            var diffX1 = x1 - x3;
            var diffY2 = y2 - y4;
            var diffX2 = x2 - x4;

            var pythag = Math.sqrt((midDiffX1 * midDiffX1) + (midDiffY1 * midDiffY1));
            var pythag2 = Math.sqrt((dX * dX) + (dY * dY));

            var adjX1 = mx2 - ((midDiffX1 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var adjY1 = my2 - ((midDiffY1 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var adjX2 = mx1 - ((midDiffX2 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var adjY2 = my1 - ((midDiffY2 * (pythag - headDistance - nodeTargetSize)) / pythag);

            var headX2 = x1 - ((diffX2 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var headY2 = y1 - ((diffY2 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var headX1 = x2 - ((diffX1 * (pythag - headDistance - nodeTargetSize)) / pythag);
            var headY1 = y2 - ((diffY1 * (pythag - headDistance - nodeTargetSize)) / pythag);

            var tipX = d.source.x - ((dX * (pythag2 - nodeTargetSize)) / pythag2);
            var tipY = d.source.y - ((dY * (pythag2 - nodeTargetSize)) / pythag2);

            return "M" + mx2 + "," + my2 + "L" + adjX1 + "," + adjY1 + "L" + headX1 + "," + headY1 + "L" + tipX + "," + tipY + "L" + headX2 + "," + headY2 + "L" + adjX2 + "," + adjY2 + "L" + mx1 + "," + my1 + "z";
        };

        function parallel(d, sourceSize, targetSize, edgeNumber) {

          var diffX = d.target.y - d.source.y;
          var diffY = d.target.x - d.source.x;

          var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
          var angle1 = angle0 + ( (Math.PI * 0.75) + (edgeNumber * 0.25) );
          var angle2 = angle0 + ( (Math.PI * 0.25) - (edgeNumber * 0.25) );

          var x1 = d.source.x + (sourceSize * Math.cos(angle1));
          var y1 = d.source.y - (sourceSize * Math.sin(angle1));
          var x2 = d.target.x + (targetSize * Math.cos(angle2));
          var y2 = d.target.y - (targetSize * Math.sin(angle2));

          return {source: {x: x1, y: y1}, target: {x: x2, y: y2}};

        }

        function offset(d, nodeSize) {
          var diffX = d.target.y - d.source.y;
          var diffY = d.target.x - d.source.x;

          var angle0 = ( Math.atan2( diffY, diffX ) + ( Math.PI / 2 ) );
          var angle1 = angle0 + ( Math.PI * 0.75 );
          var angle2 = angle0 + ( Math.PI * 0.25 );

          var x1 = d.source.x + (nodeSize * Math.cos(angle1));
          var y1 = d.source.y - (nodeSize * Math.sin(angle1));
          var x2 = d.target.x + (nodeSize * Math.cos(angle2));
          var y2 = d.target.y - (nodeSize * Math.sin(angle2));

          return {source: {x: x1, y: y1}, target: {x: x2, y: y2}};

        }

        function particle(d, path, pathWidth, speed) {
            pathWidth = pathWidth / 2;

            d.particles = d.particles.filter(function (d) {return d.current < path.getTotalLength()});

            if (d.frequency < 1) {
                if (Math.random() < d.frequency) {
                    pushParticle();
                }
            } else {
                for (var x = 0; x < d.frequency; x++) {
                    pushParticle();
                }
            }

            function pushParticle() {
                d.particles.push({current: 0, xOffset: pathWidth - (pathWidth * Math.random() * 2), yOffset: pathWidth - (pathWidth * Math.random() * 2)});
            }

            d.particles.forEach(function (particle) {
                particle.current = particle.current + speed;
                var currentPosition = path.getPointAtLength(particle.current);
                particle.x = currentPosition.x + particle.xOffset;
                particle.y = currentPosition.y + particle.yOffset;
            });
        };

        var d = {
            arrowhead: arrowhead,
            comet: comet,
            nail: nail,
            taffy: taffy,
            ribbon: ribbon,
            lineArc: lineArc,
            halfArrow: halfArrow
        };

        var project = {
            offset: offset,
            parallel: parallel
        }

        var mutate = {
            particle: particle
        }

        var version = "1.0.0";

        exports.version = version;
        exports.d = d;
        exports.project = project;
        exports.mutate = mutate;

}));

d3.sankey.js

d3.sankey = function() {
  var sankey = {},
      nodeWidth = 24,
      nodePadding = 8,
      size = [1, 1],
      nodes = [],
      links = [];

  sankey.nodeWidth = function(_) {
    if (!arguments.length) return nodeWidth;
    nodeWidth = +_;
    return sankey;
  };

  sankey.nodePadding = function(_) {
    if (!arguments.length) return nodePadding;
    nodePadding = +_;
    return sankey;
  };

  sankey.nodes = function(_) {
    if (!arguments.length) return nodes;
    nodes = _;
    return sankey;
  };

  sankey.links = function(_) {
    if (!arguments.length) return links;
    links = _;
    return sankey;
  };

  sankey.size = function(_) {
    if (!arguments.length) return size;
    size = _;
    return sankey;
  };

  sankey.layout = function(iterations) {
    computeNodeLinks();
    computeNodeValues();
    computeNodeBreadths();
    computeNodeDepths(iterations);
    computeLinkDepths();
    return sankey;
  };

  sankey.relayout = function() {
    computeLinkDepths();
    return sankey;
  };

  sankey.link = function() {
    var curvature = .5;

    function link(d) {
      var x0 = d.source.x + d.source.dx,
          x1 = d.target.x,
          xi = d3.interpolateNumber(x0, x1),
          x2 = xi(curvature),
          x3 = xi(1 - curvature),
          y0 = d.source.y + d.sy + d.dy / 2,
          y1 = d.target.y + d.ty + d.dy / 2;
      return "M" + x0 + "," + y0
           + "C" + x2 + "," + y0
           + " " + x3 + "," + y1
           + " " + x1 + "," + y1;
    }

    link.curvature = function(_) {
      if (!arguments.length) return curvature;
      curvature = +_;
      return link;
    };

    return link;
  };

  // Populate the sourceLinks and targetLinks for each node.
  // Also, if the source and target are not objects, assume they are indices.
  function computeNodeLinks() {
    nodes.forEach(function(node) {
      node.sourceLinks = [];
      node.targetLinks = [];
    });
    links.forEach(function(link) {
      var source = link.source,
          target = link.target;
      if (typeof source === "number") source = link.source = nodes[link.source];
      if (typeof target === "number") target = link.target = nodes[link.target];
      source.sourceLinks.push(link);
      target.targetLinks.push(link);
    });
  }

  // Compute the value (size) of each node by summing the associated links.
  function computeNodeValues() {
    nodes.forEach(function(node) {
      node.value = Math.max(
        d3.sum(node.sourceLinks, value),
        d3.sum(node.targetLinks, value)
      );
    });
  }

  // Iteratively assign the breadth (x-position) for each node.
  // Nodes are assigned the maximum breadth of incoming neighbors plus one;
  // nodes with no incoming links are assigned breadth zero, while
  // nodes with no outgoing links are assigned the maximum breadth.
  function computeNodeBreadths() {
    var remainingNodes = nodes,
        nextNodes,
        x = 0;

    while (remainingNodes.length) {
      nextNodes = [];
      remainingNodes.forEach(function(node) {
        node.x = x;
        node.dx = nodeWidth;
        node.sourceLinks.forEach(function(link) {
          if (nextNodes.indexOf(link.target) < 0) {
            nextNodes.push(link.target);
          }
        });
      });
      remainingNodes = nextNodes;
      ++x;
    }

    //
    moveSinksRight(x);
    scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));
  }

  function moveSourcesRight() {
    nodes.forEach(function(node) {
      if (!node.targetLinks.length) {
        node.x = d3.min(node.sourceLinks, function(d) { return d.target.x; }) - 1;
      }
    });
  }

  function moveSinksRight(x) {
    nodes.forEach(function(node) {
      if (!node.sourceLinks.length) {
        node.x = x - 1;
      }
    });
  }

  function scaleNodeBreadths(kx) {
    nodes.forEach(function(node) {
      node.x *= kx;
    });
  }

  function computeNodeDepths(iterations) {
    var nodesByBreadth = d3.nest()
        .key(function(d) { return d.x; })
        .sortKeys(d3.ascending)
        .entries(nodes)
        .map(function(d) { return d.values; });

    //
    initializeNodeDepth();
    resolveCollisions();
    for (var alpha = 1; iterations > 0; --iterations) {
      relaxRightToLeft(alpha *= .99);
      resolveCollisions();
      relaxLeftToRight(alpha);
      resolveCollisions();
    }

    function initializeNodeDepth() {
      var ky = d3.min(nodesByBreadth, function(nodes) {
        return (size[1] - (nodes.length - 1) * nodePadding) / d3.sum(nodes, value);
      });

      nodesByBreadth.forEach(function(nodes) {
        nodes.forEach(function(node, i) {
          node.y = i;
          node.dy = node.value * ky;
        });
      });

      links.forEach(function(link) {
        link.dy = link.value * ky;
      });
    }

    function relaxLeftToRight(alpha) {
      nodesByBreadth.forEach(function(nodes, breadth) {
        nodes.forEach(function(node) {
          if (node.targetLinks.length) {
            var y = d3.sum(node.targetLinks, weightedSource) / d3.sum(node.targetLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedSource(link) {
        return center(link.source) * link.value;
      }
    }

    function relaxRightToLeft(alpha) {
      nodesByBreadth.slice().reverse().forEach(function(nodes) {
        nodes.forEach(function(node) {
          if (node.sourceLinks.length) {
            var y = d3.sum(node.sourceLinks, weightedTarget) / d3.sum(node.sourceLinks, value);
            node.y += (y - center(node)) * alpha;
          }
        });
      });

      function weightedTarget(link) {
        return center(link.target) * link.value;
      }
    }

    function resolveCollisions() {
      nodesByBreadth.forEach(function(nodes) {
        var node,
            dy,
            y0 = 0,
            n = nodes.length,
            i;

        // Push any overlapping nodes down.
        nodes.sort(ascendingDepth);
        for (i = 0; i < n; ++i) {
          node = nodes[i];
          dy = y0 - node.y;
          if (dy > 0) node.y += dy;
          y0 = node.y + node.dy + nodePadding;
        }

        // If the bottommost node goes outside the bounds, push it back up.
        dy = y0 - nodePadding - size[1];
        if (dy > 0) {
          y0 = node.y -= dy;

          // Push any overlapping nodes back up.
          for (i = n - 2; i >= 0; --i) {
            node = nodes[i];
            dy = node.y + node.dy + nodePadding - y0;
            if (dy > 0) node.y -= dy;
            y0 = node.y;
          }
        }
      });
    }

    function ascendingDepth(a, b) {
      return a.y - b.y;
    }
  }

  function computeLinkDepths() {
    nodes.forEach(function(node) {
      node.sourceLinks.sort(ascendingTargetDepth);
      node.targetLinks.sort(ascendingSourceDepth);
    });
    nodes.forEach(function(node) {
      var sy = 0, ty = 0;
      node.sourceLinks.forEach(function(link) {
        link.sy = sy;
        sy += link.dy;
      });
      node.targetLinks.forEach(function(link) {
        link.ty = ty;
        ty += link.dy;
      });
    });

    function ascendingSourceDepth(a, b) {
      return a.source.y - b.source.y;
    }

    function ascendingTargetDepth(a, b) {
      return a.target.y - b.target.y;
    }
  }

  function center(node) {
    return node.y + node.dy / 2;
  }

  function value(link) {
    return link.value;
  }

  return sankey;
};

energy.json

{"nodes":[
{"name":"Agricultural 'waste'"},
{"name":"Bio-conversion"},
{"name":"Liquid"},
{"name":"Losses"},
{"name":"Solid"},
{"name":"Gas"},
{"name":"Biofuel imports"},
{"name":"Biomass imports"},
{"name":"Coal imports"},
{"name":"Coal"},
{"name":"Coal reserves"},
{"name":"District heating"},
{"name":"Industry"},
{"name":"Heating and cooling - commercial"},
{"name":"Heating and cooling - homes"},
{"name":"Electricity grid"},
{"name":"Over generation / exports"},
{"name":"H2 conversion"},
{"name":"Road transport"},
{"name":"Agriculture"},
{"name":"Rail transport"},
{"name":"Lighting & appliances - commercial"},
{"name":"Lighting & appliances - homes"},
{"name":"Gas imports"},
{"name":"Ngas"},
{"name":"Gas reserves"},
{"name":"Thermal generation"},
{"name":"Geothermal"},
{"name":"H2"},
{"name":"Hydro"},
{"name":"International shipping"},
{"name":"Domestic aviation"},
{"name":"International aviation"},
{"name":"National navigation"},
{"name":"Marine algae"},
{"name":"Nuclear"},
{"name":"Oil imports"},
{"name":"Oil"},
{"name":"Oil reserves"},
{"name":"Other waste"},
{"name":"Pumped heat"},
{"name":"Solar PV"},
{"name":"Solar Thermal"},
{"name":"Solar"},
{"name":"Tidal"},
{"name":"UK land based bioenergy"},
{"name":"Wave"},
{"name":"Wind"}
],
"links":[
{"source":0,"target":1,"value":124.729},
{"source":1,"target":2,"value":0.597},
{"source":1,"target":3,"value":26.862},
{"source":1,"target":4,"value":280.322},
{"source":1,"target":5,"value":81.144},
{"source":6,"target":2,"value":35},
{"source":7,"target":4,"value":35},
{"source":8,"target":9,"value":11.606},
{"source":10,"target":9,"value":63.965},
{"source":9,"target":4,"value":75.571},
{"source":11,"target":12,"value":10.639},
{"source":11,"target":13,"value":22.505},
{"source":11,"target":14,"value":46.184},
{"source":15,"target":16,"value":104.453},
{"source":15,"target":14,"value":113.726},
{"source":15,"target":17,"value":27.14},
{"source":15,"target":12,"value":342.165},
{"source":15,"target":18,"value":37.797},
{"source":15,"target":19,"value":4.412},
{"source":15,"target":13,"value":40.858},
{"source":15,"target":3,"value":56.691},
{"source":15,"target":20,"value":7.863},
{"source":15,"target":21,"value":90.008},
{"source":15,"target":22,"value":93.494},
{"source":23,"target":24,"value":40.719},
{"source":25,"target":24,"value":82.233},
{"source":5,"target":13,"value":0.129},
{"source":5,"target":3,"value":1.401},
{"source":5,"target":26,"value":151.891},
{"source":5,"target":19,"value":2.096},
{"source":5,"target":12,"value":48.58},
{"source":27,"target":15,"value":7.013},
{"source":17,"target":28,"value":20.897},
{"source":17,"target":3,"value":6.242},
{"source":28,"target":18,"value":20.897},
{"source":29,"target":15,"value":6.995},
{"source":2,"target":12,"value":121.066},
{"source":2,"target":30,"value":128.69},
{"source":2,"target":18,"value":135.835},
{"source":2,"target":31,"value":14.458},
{"source":2,"target":32,"value":206.267},
{"source":2,"target":19,"value":3.64},
{"source":2,"target":33,"value":33.218},
{"source":2,"target":20,"value":4.413},
{"source":34,"target":1,"value":4.375},
{"source":24,"target":5,"value":122.952},
{"source":35,"target":26,"value":839.978},
{"source":36,"target":37,"value":504.287},
{"source":38,"target":37,"value":107.703},
{"source":37,"target":2,"value":611.99},
{"source":39,"target":4,"value":56.587},
{"source":39,"target":1,"value":77.81},
{"source":40,"target":14,"value":193.026},
{"source":40,"target":13,"value":70.672},
{"source":41,"target":15,"value":59.901},
{"source":42,"target":14,"value":19.263},
{"source":43,"target":42,"value":19.263},
{"source":43,"target":41,"value":59.901},
{"source":4,"target":19,"value":0.882},
{"source":4,"target":26,"value":400.12},
{"source":4,"target":12,"value":46.477},
{"source":26,"target":15,"value":525.531},
{"source":26,"target":3,"value":787.129},
{"source":26,"target":11,"value":79.329},
{"source":44,"target":15,"value":9.452},
{"source":45,"target":1,"value":182.01},
{"source":46,"target":15,"value":19.013},
{"source":47,"target":15,"value":289.366}
]}