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.
<!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>/* 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;
}));
{
"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
}]
}