es2015 d3v4 d3-sankey demo

README.md

an es2015 fork of @syntagmatic's d3-sankey demo

---

Original README.md

---

Created using the d3-sankey plugin for D3 4.0.

Based on xaranke's port of Mike's Sankey example with drag behavior enabled and several fixes for the d3 version 4.x release.

d3-sankey.js

/* Modified to work with d3.v4 build */
(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? factory(exports, require('d3-arrays'), require('d3-interpolate')) :
  typeof define === 'function' && define.amd ? define('d3-sankey', ['exports', 'd3-arrays', 'd3-interpolate'], factory) :
  factory((global.d3_sankey = {}),global.d3_arrays,global.d3_interpolate);
}(this, function (exports,d3Arrays,d3Interpolate) { 'use strict';

  // Stolen from https://github.com/d3/d3-plugins/tree/master/sankey

  function sankey() {
    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;
  };

  var version = "0.2.0";

  exports.version = version;
  exports.sankey = 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
  }]
}

index.html

<!DOCTYPE html>
<html>
<meta charset="utf-8">
<title>Sankey Diagram</title>
<style>
  #chart {
    height: 500px;
  }

  .node rect {
    cursor: move;
    fill-opacity: .9;
    shape-rendering: crispEdges;
  }

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

  .link {
    fill: none;
    stroke: #000;
    stroke-opacity: .2;
  }

  .link:hover {
    stroke-opacity: .5;
  }
</style>
<body>
  <div id="chart"></div>
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="d3-sankey.js"></script>
  <script src='https://cdnjs.cloudflare.com/ajax/libs/babel-standalone/6.10.3/babel.min.js'></script>
  <script lang='babel' type='text/babel'>
    const margin = {
        top: 1,
        right: 1,
        bottom: 6,
        left: 1
      };

    const width = 960 - margin.left - margin.right;
    const height = 500 - margin.top - margin.bottom;
    const formatNumber = d3.format(',.0f');
    const format = d => `${formatNumber(d)} TWh`;
    const color = d3.scaleOrdinal(d3.schemeCategory20);

    const svg = d3.select('#chart').append('svg')
      .attr('width', width + margin.left + margin.right)
      .attr('height', height + margin.top + margin.bottom)
      .append('g')
      .attr('transform', `translate(${margin.left},${margin.top})`);

    const sankey = d3_sankey.sankey()
      .nodeWidth(15)
      .nodePadding(10)
      .size([width, height]);

    const path = sankey.link();

    d3.json('energy.json', energy => {

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

      const link = svg.append('g').selectAll('.link')
        .data(energy.links)
        .enter().append('path')
        .attr('class', 'link')
        .attr('d', path)
        .style('stroke-width', d => Math.max(1, d.dy))
        .sort((a, b) => b.dy - a.dy);

      link.append('title')
        .text(d => `${d.source.name} → ${d.target.name}\n${format(d.value)}`);

      const node = svg.append('g').selectAll('.node')
        .data(energy.nodes)
        .enter().append('g')
        .attr('class', 'node')
        .attr('transform', d => `translate(${d.x},${d.y})`)
        .call(d3.drag()
          .subject(d => d)
          .on('start', function() {
            this.parentNode.appendChild(this);
          })
          .on('drag', dragmove));

      node.append('rect')
        .attr('height', d => d.dy)
        .attr('width', sankey.nodeWidth())
        .style('fill', d => d.color = color(d.name.replace(/ .*/, '')))
        .style('stroke', d => d3.rgb(d.color).darker(2))
        .append('title')
        .text(d => `${d.name}\n${format(d.value)}`);

      node.append('text')
        .attr('x', -6)
        .attr('y', d => d.dy / 2)
        .attr('dy', '.35em')
        .attr('text-anchor', 'end')
        .attr('transform', null)
        .text(d => d.name)
        .filter(d => d.x < width / 2)
        .attr('x', 6 + sankey.nodeWidth())
        .attr('text-anchor', 'start');

      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();
        link.attr('d', path);
      }
    });
  </script>
</body>

preview.png

preview.xcf

thumbnail.png

Is there a version with Particles like d3v3 https://bl.ocks.org/micahstubbs/ed0ae1c70256849dab3e35a0241389c9?