Source: Department of Energy & Climate Change, Tom Counsell.
A demonstration of d3-sankey.
forked from mbostock's block: Sankey Diagram
forked from giguerre's block: Sankey Diagram
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<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>
https://d3js.org/d3.v4.min.js
https://unpkg.com/d3-sankey@0.6