Last active
November 30, 2015 01:33
-
-
Save d3byex/74c2f37ada4e7750adc5 to your computer and use it in GitHub Desktop.
D3byEX 10.9: Sankey Diagram
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
<!DOCTYPE html> | |
<html> | |
<head> | |
<meta name="description" content="D3byEX 10.9" /> | |
<meta charset="utf-8"> | |
</head> | |
<body> | |
<script src="http://d3js.org/d3.v3.min.js"></script> | |
<script src="sankey.js"></script> | |
<script> | |
var url = 'https://gist.githubusercontent.com/d3byex/25129228aa50c30ef01f/raw/e6ea7c4728e45fb8d0464b21686eec806687e117/sankey.json'; | |
d3.json(url, function (error, data) { | |
var width = 950, height = 500; | |
var svg = d3.select('body') | |
.append('svg') | |
.attr({ | |
width: width, | |
height: height | |
}); | |
var mainGroup = svg.append('g'); | |
var sankey = d3.sankey() | |
.nodeWidth(36) | |
.nodePadding(40) | |
.size([width, height]) | |
.nodes(data.nodes) | |
.links(data.links) | |
.layout(10); | |
mainGroup.append('g') | |
.selectAll('g.link') | |
.data(data.links) | |
.enter() | |
.append('path') | |
.attr({ | |
d: sankey.link(), | |
fill: 'none', | |
stroke: '#000', | |
'stroke-opacity': 0.2, | |
'stroke-width': function (d) { return Math.max(1, d.dy) } | |
}) | |
.sort(function (a, b) { return b.dy - a.dy; }); | |
var nodes = mainGroup.append('g') | |
.selectAll('g.node') | |
.data(data.nodes) | |
.enter() | |
.append('g') | |
.attr('transform', function (d) { | |
return 'translate(' + d.x + ',' + d.y + ')'; | |
}); | |
var color = d3.scale.category20(); | |
nodes.append('rect') | |
.attr({ | |
height: function (d) { return d.dy; }, | |
width: sankey.nodeWidth(), | |
fill: function (d, i) { | |
return d.color = color(i); | |
}, | |
stroke: 'black' | |
}); | |
nodes.append('text') | |
.attr({ | |
x: -6, | |
y: function (d) { return d.dy / 2; }, | |
dy: '.35em', | |
'text-anchor': 'end' | |
}) | |
.style('font', '10px sans-serif') | |
.text(function (d) { return d.name; }) | |
.filter(function (d) { return d.x < width / 2; }) | |
.attr({ | |
x: 6 + sankey.nodeWidth(), | |
'text-anchor': 'start' | |
}); | |
}); | |
</script> | |
</body> | |
</html> |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
d3.sankey = 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) { | |
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; | |
}; |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment