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A breath of relaxation

Visualizes the layout relaxation iteration of the Sankey component by Mike Bostock.

Code: https://github.com/monfera/sankey-bench

The graph layout process was visualized to see the effects of various tweaks, as the current layouting doesn't eliminate all avoidable link crossings (e.g. Marine Algae wouldn't have to cross Other waste, which, on the other hand, represents a much higher volume).

This specific animation deviates from the alpha decay in the original for a smoother initial animation: alpha starts out at zero, rides up half a sine and goes back to zero.

d3-sankey Copyright Mike Bostock

Energy data: Department of Energy & Climate Change, Tom Counsell http://tamc.github.io/Sankey/ via Mike's example

Rendering code derived from work in process Copyright Plotly, will be MIT licensed in plotly.js

d3-sankey source repository: https://github.com/d3/d3-sankey

Local modifications:

Stable sorting (irrelevant with this dataset)
Inlining code here so it works with d3 v3.*
Replacing the relaxation loop with a requestAnimationFrame loop to allow pre-iteration rendering (via passed-on render callback)
Overriding alpha decay and iteration limit check with a half-sine curve

Uploaded with blockbuilder.org

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v3.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/**
 * d3-sankey Copyright Mike Bostock
 *
 * Source repository: https://github.com/d3/d3-sankey
 *
 * Minor local modifications:
 *    - Stable sorting https://github.com/d3/d3-sankey/pull/19 (irrelevant here)
 *    - Inlining code here so it works with d3 v3.*
 *    - Replacing the relaxation loop with a rAF
 *    - Overriding alpha decay and iteration limit check with a half-sine curve
 */

// var d3 = require('d3');
var nest = d3.nest;
var interpolateNumber = d3.interpolateNumber;
var ascending = d3.ascending;
var min = d3.min;
var sum = d3.sum;

module.exports = 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, callback) {
    computeNodeLinks();
    computeNodeValues();
    computeNodeBreadths();
    computeNodeDepths(iterations, callback);
  };

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 = 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, i) {
      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];
      link.originalIndex = i;
      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(
        sum(node.sourceLinks, value),
        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 = 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, callback) {
    var nodesByBreadth = nest()
      .key(function(d) { return d.x; })
      .sortKeys(ascending)
      .entries(nodes)
      .map(function(d) { return d.values; });

//
    initializeNodeDepth();
    resolveCollisions();

window.requestAnimationFrame(function render(t) {

var alpha = Math.pow(Math.sin(t / 3000), 2);

relaxRightToLeft(alpha);
      resolveCollisions();
      relaxLeftToRight(alpha);
      resolveCollisions();
      computeLinkDepths();
      callback(sankey);

if(t / 3000 < Math.PI) {
        window.requestAnimationFrame(render);
      }

});

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

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

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

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

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

return sankey;
}

},{}],2:[function(require,module,exports){
/**
 * Direct source: https://bost.ocks.org/mike/sankey/ by Mike Bostock
 * Ultimate source: Department of Energy & Climate Change, Tom Counsell
 *                  https://tamc.github.io/Sankey/
 */

module.exports = {
  "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":14.375},
    {"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}
  ]
};

},{}],3:[function(require,module,exports){
/**
 * Copyright 2012-2017, Plotly, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

//var d3 = require('d3');
var d3sankey = require('./d3-sankey');

var data = require('./energy');

var width = 800;
var height = 500;
var margin = {
  l: 20,
  t: 20,
  r: 200,
  b: 20
};

var c = {
  nodeTextOffset: 5,
  nodeWidth: 15,
  nodePadding: 14,
  sankeyIterations: 700,
  vertical: false,
  nodeOpacity: 0.7,
  nodeSalientOpacity: 1,
  linkOpacity: 0.2,
  linkSalientOpacity: 0.4
};

function keyFun(d) {return d.key;}

function repeat(d) {return [d];}

function noop() {}

function viewModel(sankey) {

return {
    key: 0,
    translateX: margin.l,
    translateY: margin.t,
    dragLength: c.vertical ? width : height,
    nodes: sankey.nodes(),
    links: sankey.links(),
    sankey: sankey
  };
}

function render(svg, callbacks) {
  return function(sankey) {

var dragInProgress = false;
    var hovered = false;

function linkPath(d) {
      return d.sankey.link()(d.link);
    }

var colorer = d3.scale.category20();

var sankey = svg.selectAll('.sankey')
      .data([viewModel(sankey)], keyFun);

sankey.enter()
      .append('g')
      .classed('sankey', true)
      .attr('overflow', 'visible')
      .style('box-sizing', 'content-box')
      .style('position', 'absolute')
      .style('left', 0)
      .style('overflow', 'visible')
      .style('shape-rendering', 'geometricPrecision')
      .style('pointer-events', 'auto')
      .style('box-sizing', 'content-box');

sankey
      .attr('transform', function(d) {
        return 'translate(' + d.translateX + ',' + d.translateY + ')';
      });

var sankeyLinks = sankey.selectAll('.sankeyLinks')
      .data(repeat, keyFun);

sankeyLinks.enter()
      .append('g')
      .classed('sankeyLinks', true)
      .style('transform', c.vertical ? 'matrix(0,1,1,0,0,0)' : 'matrix(1,0,0,1,0,0)')
      .style('fill', 'none')
      .style('stroke', 'black')
      .style('stroke-opacity', c.linkOpacity);

sankeyLink.enter()
      .append('path')
      .classed('sankeyPath', true)
      .call(attachPointerEvents, callbacks.linkEvents);

sankeyLink
      .attr('d', linkPath)
      .style('stroke-width', function(d) {return Math.max(1, d.link.dy);});

var sankeyNodes = sankey.selectAll('.sankeyNodes')
      .data(repeat, keyFun);

sankeyNodes.enter()
      .append('g')
      .style('shape-rendering', 'crispEdges')
      .classed('sankeyNodes', true);

sankeyNode.enter()
      .append('g')
      .classed('sankeyNode', true)
      .call(d3.behavior.drag()
        .origin(function(d) {return c.vertical ? {x: d.node.y} : d.node;})
        .on('dragstart', function(d) {
          d.node.dragStartLocation = c.vertical ? d3.event.x : d3.event.y;
          this.parentNode.appendChild(this);
          dragInProgress = true;
          if(hovered) {
            //callbacks.nodeEvents.unhover.apply(0, hovered);
            hovered = false;
          }
        })
        .on('drag', function(d) {
            if(c.vertical) {
              d.node.y = Math.max(0, Math.min(d.model.dragLength - d.node.dy, d3.event.x));
              d3.select(this).style('transform', 'translate(' + d.node.y + 'px,' + d.node.x + 'px)');
            } else {
              d.node.y = Math.max(0, Math.min(d.model.dragLength - d.node.dy, d3.event.y));
              d3.select(this).style('transform', 'translate(' + d.node.x + 'px,' + d.node.y + 'px)');
            }

d.sankey.relayout();
            sankeyLink.attr('d', linkPath);
          }
        )
        .on('dragend', function() {
          dragInProgress = false;
        }));

sankeyNode
      .style('transform', c.vertical ?
        function(d) {return 'translate(' + (Math.floor(d.node.y) - 0.5) + 'px, ' + (Math.floor(d.node.x) + 0.5) + 'px)';} :
        function(d) {return 'translate(' + (Math.floor(d.node.x) - 0.5) + 'px, ' + (Math.floor(d.node.y) + 0.5) + 'px)';});

var nodeRect = sankeyNode.selectAll('.nodeRect')
      .data(repeat);

nodeRect.enter()
      .append('rect')
      .classed('nodeRect', true)
      .style('shape-rendering', 'crispEdges')
      .style('fill', function(d) {return colorer(d.sankey.nodes().indexOf(d.node));})
      .style('stroke-width', 0.5)
      .style('stroke', 'black')
      .style('stroke-opacity', 1)
      .style('fill-opacity', c.nodeOpacity)
      .call(attachPointerEvents, callbacks.nodeEvents);

nodeRect // ceil, +/-0.5 and crispEdges is wizardry for consistent border width on all 4 sides
      .attr(c.vertical ? 'height' : 'width', function(d) {return Math.ceil(d.node.dx + 0.5);})
      .attr(c.vertical ? 'width' : 'height', function(d) {return Math.ceil(d.node.dy - 0.5);});

var nodeLabel = sankeyNode.selectAll('.nodeLabel')
      .data(repeat);

nodeLabel.enter()
      .append('text')
      .classed('nodeLabel', true);

nodeLabel
      .attr('x', function(d) {return c.vertical ? d.node.dy / 2 : d.node.dx + c.nodeTextOffset;})
      .attr('y', function(d) {return c.vertical ? d.node.dx / 2 : d.node.dy / 2;})
      .text(function(d) {return d.node.name;})
      .attr('alignment-baseline', 'middle')
      .attr('text-anchor', c.vertical ? 'middle' : 'start')
      .style('font-family', 'sans-serif')
      .style('font-size', '10px');
  };
};

var svg = d3.select('body').append('svg')
  .attr('width', width + margin.l + margin.r)
  .attr('height', height + margin.t + margin.b);

d3sankey()
  .size(c.vertical ? [height, width]: [width, height])
  .nodeWidth(c.nodeWidth)
  .nodePadding(c.nodePadding)
  .nodes(data.nodes)
  .links(data.links)
  .layout(c.sankeyIterations, renderer);
},{"./d3-sankey":1,"./energy":2}]},{},[3])
//# 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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","/**\n * d3-sankey Copyright Mike Bostock\n *\n * Source repository: https://github.com/d3/d3-sankey\n *\n * Minor local modifications:\n *    - Stable sorting https://github.com/d3/d3-sankey/pull/19 (irrelevant here)\n *    - Inlining code here so it works with d3 v3.*\n *    - Replacing the relaxation loop with a rAF\n *    - Overriding alpha decay and iteration limit check with a half-sine curve\n */\n\n// var d3 = require('d3');\nvar nest = d3.nest;\nvar interpolateNumber = d3.interpolateNumber;\nvar ascending = d3.ascending;\nvar min = d3.min;\nvar sum = d3.sum;\n\nmodule.exports = function() {\n  var sankey = {},\n      nodeWidth = 24,\n      nodePadding = 8,\n      size = [1, 1],\n      nodes = [],\n      links = [];\n\n  sankey.nodeWidth = function(_) {\n    if (!arguments.length) return nodeWidth;\n    nodeWidth = +_;\n    return sankey;\n  };\n\n  sankey.nodePadding = function(_) {\n    if (!arguments.length) return nodePadding;\n    nodePadding = +_;\n    return sankey;\n  };\n\n  sankey.nodes = function(_) {\n    if (!arguments.length) return nodes;\n    nodes = _;\n    return sankey;\n  };\n\n  sankey.links = function(_) {\n    if (!arguments.length) return links;\n    links = _;\n    return sankey;\n  };\n\n  sankey.size = function(_) {\n    if (!arguments.length) return size;\n    size = _;\n    return sankey;\n  };\n\n  sankey.layout = function(iterations, callback) {\n    computeNodeLinks();\n    computeNodeValues();\n    computeNodeBreadths();\n    computeNodeDepths(iterations, callback);\n  };\n\n  sankey.relayout = function() {\n    computeLinkDepths();\n    return sankey;\n  };\n\n  sankey.link = function() {\n    var curvature = .5;\n\n    function link(d) {\n      var x0 = d.source.x + d.source.dx,\n          x1 = d.target.x,\n          xi = interpolateNumber(x0, x1),\n          x2 = xi(curvature),\n          x3 = xi(1 - curvature),\n          y0 = d.source.y + d.sy + d.dy / 2,\n          y1 = d.target.y + d.ty + d.dy / 2;\n      return \"M\" + x0 + \",\" + y0\n        + \"C\" + x2 + \",\" + y0\n        + \" \" + x3 + \",\" + y1\n        + \" \" + x1 + \",\" + y1;\n    }\n\n    link.curvature = function(_) {\n      if (!arguments.length) return curvature;\n      curvature = +_;\n      return link;\n    };\n\n    return link;\n  };\n\n  // Populate the sourceLinks and targetLinks for each node.\n  // Also, if the source and target are not objects, assume they are indices.\n  function computeNodeLinks() {\n    nodes.forEach(function(node) {\n      node.sourceLinks = [];\n      node.targetLinks = [];\n    });\n    links.forEach(function(link, i) {\n      var source = link.source,\n          target = link.target;\n      if (typeof source === \"number\") source = link.source = nodes[link.source];\n      if (typeof target === \"number\") target = link.target = nodes[link.target];\n      link.originalIndex = i;\n      source.sourceLinks.push(link);\n      target.targetLinks.push(link);\n    });\n  }\n\n  // Compute the value (size) of each node by summing the associated links.\n  function computeNodeValues() {\n    nodes.forEach(function(node) {\n      node.value = Math.max(\n        sum(node.sourceLinks, value),\n        sum(node.targetLinks, value)\n      );\n    });\n  }\n\n  // Iteratively assign the breadth (x-position) for each node.\n  // Nodes are assigned the maximum breadth of incoming neighbors plus one;\n  // nodes with no incoming links are assigned breadth zero, while\n  // nodes with no outgoing links are assigned the maximum breadth.\n  function computeNodeBreadths() {\n    var remainingNodes = nodes,\n        nextNodes,\n        x = 0;\n\n    while (remainingNodes.length) {\n      nextNodes = [];\n      remainingNodes.forEach(function(node) {\n        node.x = x;\n        node.dx = nodeWidth;\n        node.sourceLinks.forEach(function(link) {\n          if (nextNodes.indexOf(link.target) < 0) {\n            nextNodes.push(link.target);\n          }\n        });\n      });\n      remainingNodes = nextNodes;\n      ++x;\n    }\n\n    //\n    moveSinksRight(x);\n    scaleNodeBreadths((size[0] - nodeWidth) / (x - 1));\n  }\n\n  // function moveSourcesRight() {\n  //   nodes.forEach(function(node) {\n  //     if (!node.targetLinks.length) {\n  //       node.x = min(node.sourceLinks, function(d) { return d.target.x; }) - 1;\n  //     }\n  //   });\n  // }\n\n  function moveSinksRight(x) {\n    nodes.forEach(function(node) {\n      if (!node.sourceLinks.length) {\n        node.x = x - 1;\n      }\n    });\n  }\n\n  function scaleNodeBreadths(kx) {\n    nodes.forEach(function(node) {\n      node.x *= kx;\n    });\n  }\n\n  function computeNodeDepths(iterations, callback) {\n    var nodesByBreadth = nest()\n      .key(function(d) { return d.x; })\n      .sortKeys(ascending)\n      .entries(nodes)\n      .map(function(d) { return d.values; });\n\n    //\n    initializeNodeDepth();\n    resolveCollisions();\n\n    window.requestAnimationFrame(function render(t) {\n\n      var alpha = Math.pow(Math.sin(t / 3000), 2);\n\n      relaxRightToLeft(alpha);\n      resolveCollisions();\n      relaxLeftToRight(alpha);\n      resolveCollisions();\n      computeLinkDepths();\n      callback(sankey);\n\n      if(t / 3000 < Math.PI) {\n        window.requestAnimationFrame(render);\n      }\n\n    });\n\n    function initializeNodeDepth() {\n      var ky = min(nodesByBreadth, function(nodes) {\n        return (size[1] - (nodes.length - 1) * nodePadding) / sum(nodes, value);\n      });\n\n      nodesByBreadth.forEach(function(nodes) {\n        nodes.forEach(function(node, i) {\n          node.y = i;\n          node.dy = node.value * ky;\n        });\n      });\n\n      links.forEach(function(link) {\n        link.dy = link.value * ky;\n      });\n    }\n\n    function relaxLeftToRight(alpha) {\n      nodesByBreadth.forEach(function(nodes) {\n        nodes.forEach(function(node) {\n          if (node.targetLinks.length) {\n            var y = sum(node.targetLinks, weightedSource) / sum(node.targetLinks, value);\n            node.y += (y - center(node)) * alpha;\n          }\n        });\n      });\n\n      function weightedSource(link) {\n        return center(link.source) * link.value;\n      }\n    }\n\n    function relaxRightToLeft(alpha) {\n      nodesByBreadth.slice().reverse().forEach(function(nodes) {\n        nodes.forEach(function(node) {\n          if (node.sourceLinks.length) {\n            var y = sum(node.sourceLinks, weightedTarget) / sum(node.sourceLinks, value);\n            node.y += (y - center(node)) * alpha;\n          }\n        });\n      });\n\n      function weightedTarget(link) {\n        return center(link.target) * link.value;\n      }\n    }\n\n    function resolveCollisions() {\n      nodesByBreadth.forEach(function(nodes) {\n        var node,\n            dy,\n            y0 = 0,\n            n = nodes.length,\n            i;\n\n        // Push any overlapping nodes down.\n        nodes.sort(ascendingDepth);\n        for (i = 0; i < n; ++i) {\n          node = nodes[i];\n          dy = y0 - node.y;\n          if (dy > 0) node.y += dy;\n          y0 = node.y + node.dy + nodePadding;\n        }\n\n        // If the bottommost node goes outside the bounds, push it back up.\n        dy = y0 - nodePadding - size[1];\n        if (dy > 0) {\n          y0 = node.y -= dy;\n\n          // Push any overlapping nodes back up.\n          for (i = n - 2; i >= 0; --i) {\n            node = nodes[i];\n            dy = node.y + node.dy + nodePadding - y0;\n            if (dy > 0) node.y -= dy;\n            y0 = node.y;\n          }\n        }\n      });\n    }\n\n    function ascendingDepth(a, b) {\n      return a.y - b.y;\n    }\n  }\n\n  function computeLinkDepths() {\n    nodes.forEach(function(node) {\n      node.sourceLinks.sort(ascendingTargetDepth);\n      node.targetLinks.sort(ascendingSourceDepth);\n    });\n    nodes.forEach(function(node) {\n      var sy = 0, ty = 0;\n      node.sourceLinks.forEach(function(link) {\n        link.sy = sy;\n        sy += link.dy;\n      });\n      node.targetLinks.forEach(function(link) {\n        link.ty = ty;\n        ty += link.dy;\n      });\n    });\n\n    function ascendingSourceDepth(a, b) {\n      return (a.source.y - b.source.y) || (a.originalIndex - b.originalIndex);\n    }\n\n    function ascendingTargetDepth(a, b) {\n      return (a.target.y - b.target.y) || (a.originalIndex - b.originalIndex);\n    }\n  }\n\n  function center(node) {\n    return node.y + node.dy / 2;\n  }\n\n  function value(link) {\n    return link.value;\n  }\n\n  return sankey;\n}\n","/**\n * Direct source: https://bost.ocks.org/mike/sankey/ by Mike Bostock\n * Ultimate source: Department of Energy & Climate Change, Tom Counsell\n *                  http://tamc.github.io/Sankey/\n */\n\nmodule.exports = {\n  \"nodes\":[\n    {\"name\":\"Agricultural 'waste'\"},\n    {\"name\":\"Bio-conversion\"},\n    {\"name\":\"Liquid\"},\n    {\"name\":\"Losses\"},\n    {\"name\":\"Solid\"},\n    {\"name\":\"Gas\"},\n    {\"name\":\"Biofuel imports\"},\n    {\"name\":\"Biomass imports\"},\n    {\"name\":\"Coal imports\"},\n    {\"name\":\"Coal\"},\n    {\"name\":\"Coal reserves\"},\n    {\"name\":\"District heating\"},\n    {\"name\":\"Industry\"},\n    {\"name\":\"Heating and cooling - commercial\"},\n    {\"name\":\"Heating and cooling - homes\"},\n    {\"name\":\"Electricity grid\"},\n    {\"name\":\"Over generation / exports\"},\n    {\"name\":\"H2 conversion\"},\n    {\"name\":\"Road transport\"},\n    {\"name\":\"Agriculture\"},\n    {\"name\":\"Rail transport\"},\n    {\"name\":\"Lighting & appliances - commercial\"},\n    {\"name\":\"Lighting & appliances - homes\"},\n    {\"name\":\"Gas imports\"},\n    {\"name\":\"Ngas\"},\n    {\"name\":\"Gas reserves\"},\n    {\"name\":\"Thermal generation\"},\n    {\"name\":\"Geothermal\"},\n    {\"name\":\"H2\"},\n    {\"name\":\"Hydro\"},\n    {\"name\":\"International shipping\"},\n    {\"name\":\"Domestic aviation\"},\n    {\"name\":\"International aviation\"},\n    {\"name\":\"National navigation\"},\n    {\"name\":\"Marine algae\"},\n    {\"name\":\"Nuclear\"},\n    {\"name\":\"Oil imports\"},\n    {\"name\":\"Oil\"},\n    {\"name\":\"Oil reserves\"},\n    {\"name\":\"Other waste\"},\n    {\"name\":\"Pumped heat\"},\n    {\"name\":\"Solar PV\"},\n    {\"name\":\"Solar Thermal\"},\n    {\"name\":\"Solar\"},\n    {\"name\":\"Tidal\"},\n    {\"name\":\"UK land based bioenergy\"},\n    {\"name\":\"Wave\"},\n    {\"name\":\"Wind\"}\n  ],\n  \"links\":[\n    {\"source\":0,\"target\":1,\"value\":124.729},\n    {\"source\":1,\"target\":2,\"value\":0.597},\n    {\"source\":1,\"target\":3,\"value\":26.862},\n    {\"source\":1,\"target\":4,\"value\":280.322},\n    {\"source\":1,\"target\":5,\"value\":81.144},\n    {\"source\":6,\"target\":2,\"value\":35},\n    {\"source\":7,\"target\":4,\"value\":35},\n    {\"source\":8,\"target\":9,\"value\":11.606},\n    {\"source\":10,\"target\":9,\"value\":63.965},\n    {\"source\":9,\"target\":4,\"value\":75.571},\n    {\"source\":11,\"target\":12,\"value\":10.639},\n    {\"source\":11,\"target\":13,\"value\":22.505},\n    {\"source\":11,\"target\":14,\"value\":46.184},\n    {\"source\":15,\"target\":16,\"value\":104.453},\n    {\"source\":15,\"target\":14,\"value\":113.726},\n    {\"source\":15,\"target\":17,\"value\":27.14},\n    {\"source\":15,\"target\":12,\"value\":342.165},\n    {\"source\":15,\"target\":18,\"value\":37.797},\n    {\"source\":15,\"target\":19,\"value\":4.412},\n    {\"source\":15,\"target\":13,\"value\":40.858},\n    {\"source\":15,\"target\":3,\"value\":56.691},\n    {\"source\":15,\"target\":20,\"value\":7.863},\n    {\"source\":15,\"target\":21,\"value\":90.008},\n    {\"source\":15,\"target\":22,\"value\":93.494},\n    {\"source\":23,\"target\":24,\"value\":40.719},\n    {\"source\":25,\"target\":24,\"value\":82.233},\n    {\"source\":5,\"target\":13,\"value\":0.129},\n    {\"source\":5,\"target\":3,\"value\":1.401},\n    {\"source\":5,\"target\":26,\"value\":151.891},\n    {\"source\":5,\"target\":19,\"value\":2.096},\n    {\"source\":5,\"target\":12,\"value\":48.58},\n    {\"source\":27,\"target\":15,\"value\":7.013},\n    {\"source\":17,\"target\":28,\"value\":20.897},\n    {\"source\":17,\"target\":3,\"value\":6.242},\n    {\"source\":28,\"target\":18,\"value\":20.897},\n    {\"source\":29,\"target\":15,\"value\":6.995},\n    {\"source\":2,\"target\":12,\"value\":121.066},\n    {\"source\":2,\"target\":30,\"value\":128.69},\n    {\"source\":2,\"target\":18,\"value\":135.835},\n    {\"source\":2,\"target\":31,\"value\":14.458},\n    {\"source\":2,\"target\":32,\"value\":206.267},\n    {\"source\":2,\"target\":19,\"value\":3.64},\n    {\"source\":2,\"target\":33,\"value\":33.218},\n    {\"source\":2,\"target\":20,\"value\":4.413},\n    {\"source\":34,\"target\":1,\"value\":14.375},\n    {\"source\":24,\"target\":5,\"value\":122.952},\n    {\"source\":35,\"target\":26,\"value\":839.978},\n    {\"source\":36,\"target\":37,\"value\":504.287},\n    {\"source\":38,\"target\":37,\"value\":107.703},\n    {\"source\":37,\"target\":2,\"value\":611.99},\n    {\"source\":39,\"target\":4,\"value\":56.587},\n    {\"source\":39,\"target\":1,\"value\":77.81},\n    {\"source\":40,\"target\":14,\"value\":193.026},\n    {\"source\":40,\"target\":13,\"value\":70.672},\n    {\"source\":41,\"target\":15,\"value\":59.901},\n    {\"source\":42,\"target\":14,\"value\":19.263},\n    {\"source\":43,\"target\":42,\"value\":19.263},\n    {\"source\":43,\"target\":41,\"value\":59.901},\n    {\"source\":4,\"target\":19,\"value\":0.882},\n    {\"source\":4,\"target\":26,\"value\":400.12},\n    {\"source\":4,\"target\":12,\"value\":46.477},\n    {\"source\":26,\"target\":15,\"value\":525.531},\n    {\"source\":26,\"target\":3,\"value\":787.129},\n    {\"source\":26,\"target\":11,\"value\":79.329},\n    {\"source\":44,\"target\":15,\"value\":9.452},\n    {\"source\":45,\"target\":1,\"value\":182.01},\n    {\"source\":46,\"target\":15,\"value\":19.013},\n    {\"source\":47,\"target\":15,\"value\":289.366}\n  ]\n};\n","/**\n * Copyright 2012-2017, Plotly, Inc.\n * All rights reserved.\n *\n * This source code is licensed under the MIT license found in the\n * LICENSE file in the root directory of this source tree.\n */\n\n//var d3 = require('d3');\nvar d3sankey = require('./d3-sankey');\n\nvar data = require('./energy');\n\nvar width = 960;\nvar height = 500;\nvar margin = {\n  l: 20,\n  t: 20,\n  r: 200,\n  b: 20\n};\n\nvar c = {\n  nodeTextOffset: 5,\n  nodeWidth: 15,\n  nodePadding: 14,\n  sankeyIterations: 700,\n  vertical: false,\n  nodeOpacity: 0.7,\n  nodeSalientOpacity: 1,\n  linkOpacity: 0.2,\n  linkSalientOpacity: 0.4\n};\n\nfunction keyFun(d) {return d.key;}\n\nfunction repeat(d) {return [d];}\n\nfunction noop() {}\n\nfunction viewModel(sankey) {\n\n  return {\n    key: 0,\n    translateX: margin.l,\n    translateY: margin.t,\n    dragLength: c.vertical ? width : height,\n    nodes: sankey.nodes(),\n    links: sankey.links(),\n    sankey: sankey\n  };\n}\n\nfunction render(svg, callbacks) {\n  return function(sankey) {\n\n    var dragInProgress = false;\n    var hovered = false;\n\n    function attachPointerEvents(selection, eventSet) {\n      selection\n        .on('mouseover', function (d) {\n          if (!dragInProgress) {\n            eventSet.hover(this, d);\n            hovered = [this, d];\n          }\n        })\n        .on('mouseout', function (d) {\n          if (!dragInProgress) {\n            eventSet.unhover(this, d);\n            hovered = false;\n          }\n        })\n        .on('click', function (d) {\n          if (hovered) {\n            eventSet.unhover(this, d);\n            hovered = false;\n          }\n          if (!dragInProgress) {\n            eventSet.select(this, d);\n          }\n        });\n    }\n\n    function linkPath(d) {\n      return d.sankey.link()(d.link);\n    }\n\n    var colorer = d3.scale.category20();\n\n    var sankey = svg.selectAll('.sankey')\n      .data([viewModel(sankey)], keyFun);\n\n    sankey.enter()\n      .append('g')\n      .classed('sankey', true)\n      .attr('overflow', 'visible')\n      .style('box-sizing', 'content-box')\n      .style('position', 'absolute')\n      .style('left', 0)\n      .style('overflow', 'visible')\n      .style('shape-rendering', 'geometricPrecision')\n      .style('pointer-events', 'auto')\n      .style('box-sizing', 'content-box');\n\n    sankey\n      .attr('transform', function(d) {\n        return 'translate(' + d.translateX + ',' + d.translateY + ')';\n      });\n\n    var sankeyLinks = sankey.selectAll('.sankeyLinks')\n      .data(repeat, keyFun);\n\n    sankeyLinks.enter()\n      .append('g')\n      .classed('sankeyLinks', true)\n      .style('transform', c.vertical ? 'matrix(0,1,1,0,0,0)' : 'matrix(1,0,0,1,0,0)')\n      .style('fill', 'none')\n      .style('stroke', 'black')\n      .style('stroke-opacity', c.linkOpacity);\n\n    var sankeyLink = sankeyLinks.selectAll('.sankeyPath')\n      .data(function(d) {\n        return d.sankey.links().map(function(l) {\n          return {\n            link: l,\n            sankey: d.sankey\n          };\n        });\n      });\n\n    sankeyLink.enter()\n      .append('path')\n      .classed('sankeyPath', true)\n      .call(attachPointerEvents, callbacks.linkEvents);\n\n    sankeyLink\n      .attr('d', linkPath)\n      .style('stroke-width', function(d) {return Math.max(1, d.link.dy);});\n\n    var sankeyNodes = sankey.selectAll('.sankeyNodes')\n      .data(repeat, keyFun);\n\n    sankeyNodes.enter()\n      .append('g')\n      .style('shape-rendering', 'crispEdges')\n      .classed('sankeyNodes', true);\n\n    var sankeyNode = sankeyNodes.selectAll('.sankeyNode')\n      .data(function(d) {\n        return d.sankey.nodes().map(function(l) {\n          return {\n            node: l,\n            sankey: d.sankey,\n            model: d\n          };\n        });\n      }, function(d) {return d.node.name;});\n\n    sankeyNode.enter()\n      .append('g')\n      .classed('sankeyNode', true)\n      .call(d3.behavior.drag()\n        .origin(function(d) {return c.vertical ? {x: d.node.y} : d.node;})\n        .on('dragstart', function(d) {\n          d.node.dragStartLocation = c.vertical ? d3.event.x : d3.event.y;\n          this.parentNode.appendChild(this);\n          dragInProgress = true;\n          if(hovered) {\n            //callbacks.nodeEvents.unhover.apply(0, hovered);\n            hovered = false;\n          }\n        })\n        .on('drag', function(d) {\n            if(c.vertical) {\n              d.node.y = Math.max(0, Math.min(d.model.dragLength - d.node.dy, d3.event.x));\n              d3.select(this).style('transform', 'translate(' + d.node.y + 'px,' + d.node.x + 'px)');\n            } else {\n              d.node.y = Math.max(0, Math.min(d.model.dragLength - d.node.dy, d3.event.y));\n              d3.select(this).style('transform', 'translate(' + d.node.x + 'px,' + d.node.y + 'px)');\n            }\n\n            d.sankey.relayout();\n            sankeyLink.attr('d', linkPath);\n          }\n        )\n        .on('dragend', function() {\n          dragInProgress = false;\n        }));\n\n    sankeyNode\n      .style('transform', c.vertical ?\n        function(d) {return 'translate(' + (Math.floor(d.node.y) - 0.5) + 'px, ' + (Math.floor(d.node.x) + 0.5) + 'px)';} :\n        function(d) {return 'translate(' + (Math.floor(d.node.x) - 0.5) + 'px, ' + (Math.floor(d.node.y) + 0.5) + 'px)';});\n\n    var nodeRect = sankeyNode.selectAll('.nodeRect')\n      .data(repeat);\n\n    nodeRect.enter()\n      .append('rect')\n      .classed('nodeRect', true)\n      .style('shape-rendering', 'crispEdges')\n      .style('fill', function(d) {return colorer(d.sankey.nodes().indexOf(d.node));})\n      .style('stroke-width', 0.5)\n      .style('stroke', 'black')\n      .style('stroke-opacity', 1)\n      .style('fill-opacity', c.nodeOpacity)\n      .call(attachPointerEvents, callbacks.nodeEvents);\n\n    nodeRect // ceil, +/-0.5 and crispEdges is wizardry for consistent border width on all 4 sides\n      .attr(c.vertical ? 'height' : 'width', function(d) {return Math.ceil(d.node.dx + 0.5);})\n      .attr(c.vertical ? 'width' : 'height', function(d) {return Math.ceil(d.node.dy - 0.5);});\n\n    var nodeLabel = sankeyNode.selectAll('.nodeLabel')\n      .data(repeat);\n\n    nodeLabel.enter()\n      .append('text')\n      .classed('nodeLabel', true);\n\n    nodeLabel\n      .attr('x', function(d) {return c.vertical ? d.node.dy / 2 : d.node.dx + c.nodeTextOffset;})\n      .attr('y', function(d) {return c.vertical ? d.node.dx / 2 : d.node.dy / 2;})\n      .text(function(d) {return d.node.name;})\n      .attr('alignment-baseline', 'middle')\n      .attr('text-anchor', c.vertical ? 'middle' : 'start')\n      .style('font-family', 'sans-serif')\n      .style('font-size', '10px');\n  };\n};\n\nvar svg = d3.select('body').append('svg')\n  .attr('width', width + margin.l + margin.r)\n  .attr('height', height + margin.t + margin.b);\n\nvar renderer = render(svg, {\n  linkEvents: {\n    hover: function(e, l) {\n      d3.selectAll('.nodeRect')\n        .filter(function(n) {return n.node.name === l.link.source.name || n.node.name === l.link.target.name;})\n        .style('fill-opacity', c.nodeSalientOpacity);\n      d3.select(e).style('stroke-opacity', c.linkSalientOpacity);\n    },\n    unhover: function(e, d) {\n      d3.selectAll('.nodeRect').style('fill-opacity', c.nodeOpacity);\n      d3.select(e).style('stroke-opacity', c.linkOpacity);\n    },\n    select: noop\n  },\n  nodeEvents: {\n    hover: function(e, n) {\n      d3.selectAll('.sankeyPath')\n        .filter(function(l) {return n.node.name === l.link.source.name || n.node.name === l.link.target.name;})\n        .style('stroke-opacity', c.linkSalientOpacity);\n      d3.select(e).style('fill-opacity', c.nodeSalientOpacity);\n    },\n    unhover: function(e, d) {\n      d3.selectAll('.sankeyPath').style('stroke-opacity', c.linkOpacity);\n      d3.select(e).style('fill-opacity', c.nodeOpacity);\n    },\n    select: noop\n  }\n});\n\nd3sankey()\n  .size(c.vertical ? [height, width]: [width, height])\n  .nodeWidth(c.nodeWidth)\n  .nodePadding(c.nodePadding)\n  .nodes(data.nodes)\n  .links(data.links)\n  .layout(c.sankeyIterations, renderer);"]}

</script>
</body>

https://d3js.org/d3.v3.min.js