Sankey Diagram

.block

border: no
license: gpl-3.0

README.md

Source: Department of Energy & Climate Change, Tom Counsell.

A demonstration of d3-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>
<svg width="960" height="500"></svg>
<script src="https://d3js.org/d3.v4.min.js"></script>
<script src="https://unpkg.com/d3-sankey@0.6"></script>
<script>

var svg = d3.select("svg"),
    width = +svg.attr("width"),
    height = +svg.attr("height");

var formatNumber = d3.format(",.0f"),
    format = function(d) { return formatNumber(d) + " TWh"; },
    color = d3.scaleOrdinal(d3.schemeCategory10);

var sankey = d3.sankey()
    .nodeWidth(15)
    .nodePadding(10)
    .extent([[1, 1], [width - 1, height - 6]]);

var link = svg.append("g")
    .attr("class", "links")
    .attr("fill", "none")
    .attr("stroke", "#000")
    .attr("stroke-opacity", 0.2)
  .selectAll("path");

var node = svg.append("g")
    .attr("class", "nodes")
    .attr("font-family", "sans-serif")
    .attr("font-size", 10)
  .selectAll("g");

d3.json("energy.json", function(error, energy) {
  if (error) throw error;

  sankey(energy);

  link = link
    .data(energy.links)
    .enter().append("path")
      .attr("d", d3.sankeyLinkHorizontal())
      .attr("stroke-width", function(d) { return Math.max(1, d.width); });

  link.append("title")
      .text(function(d) { return d.source.name + " → " + d.target.name + "\n" + format(d.value); });

  node = node
    .data(energy.nodes)
    .enter().append("g");

  node.append("rect")
      .attr("x", function(d) { return d.x0; })
      .attr("y", function(d) { return d.y0; })
      .attr("height", function(d) { return d.y1 - d.y0; })
      .attr("width", function(d) { return d.x1 - d.x0; })
      .attr("fill", function(d) { return color(d.name.replace(/ .*/, "")); })
      .attr("stroke", "#000");

  node.append("text")
      .attr("x", function(d) { return d.x0 - 6; })
      .attr("y", function(d) { return (d.y1 + d.y0) / 2; })
      .attr("dy", "0.35em")
      .attr("text-anchor", "end")
      .text(function(d) { return d.name; })
    .filter(function(d) { return d.x0 < width / 2; })
      .attr("x", function(d) { return d.x1 + 6; })
      .attr("text-anchor", "start");

  node.append("title")
      .text(function(d) { return d.name + "\n" + format(d.value); });
});

</script>

preview.png

thumbnail.png