A Pen by Carl V Lewis on CodePen.
Created
February 15, 2017 01:40
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D3 Gradient Sankey
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var units = "Widgets"; | |
var margin = { | |
top: 10, | |
right: 10, | |
bottom: 10, | |
left: 10 | |
}, | |
width = 1000 - margin.left - margin.right, | |
height = 600 - margin.top - margin.bottom; | |
var formatNumber = d3.format(",.0f"), // zero decimal places | |
format = function(d) { | |
return formatNumber(d) + " " + units; | |
}, | |
color = d3.scale.category20(); | |
// append the svg canvas to the page | |
var svg = d3.select("body").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 + ")"); | |
var defs = svg.append("defs"); | |
// Set the sankey diagram properties | |
var sankey = d3sankey() | |
.nodeWidth(25) | |
.nodePadding(15) | |
.size([width, height]); | |
var path = sankey.link(); | |
// load the data | |
var graph = getData(); | |
sankey.nodes(graph.nodes) | |
.links(graph.links) | |
.layout(32); | |
// define utility functions | |
function getGradID(d) { | |
return "linkGrad-" + d.source.name + "-" + d.target.name; | |
} | |
function nodeColor(d) { | |
return d.color = color(d.name.replace(/ .*/, "")); | |
} | |
// create gradients for the links | |
var grads = defs.selectAll("linearGradient") | |
.data(graph.links, getGradID); | |
grads.enter().append("linearGradient") | |
.attr("id", getGradID) | |
.attr("gradientUnits", "userSpaceOnUse"); | |
function positionGrads() { | |
grads.attr("x1", function(d) { | |
return d.source.x; | |
}) | |
.attr("y1", function(d) { | |
return d.source.y; | |
}) | |
.attr("x2", function(d) { | |
return d.target.x; | |
}) | |
.attr("y2", function(d) { | |
return d.target.y; | |
}); | |
} | |
positionGrads(); | |
grads.html("") //erase any existing <stop> elements on update | |
.append("stop") | |
.attr("offset", "0%") | |
.attr("stop-color", function(d) { | |
return nodeColor((+d.source.x <= +d.target.x) ? | |
d.source : d.target); | |
}); | |
grads.append("stop") | |
.attr("offset", "100%") | |
.attr("stop-color", function(d) { | |
return nodeColor((+d.source.x > +d.target.x) ? | |
d.source : d.target) | |
}); | |
// add in the links | |
var link = svg.append("g").selectAll(".link") | |
.data(graph.links) | |
.enter().append("path") | |
.attr("class", "link") | |
.attr("d", path) | |
.style("fill", "none") | |
.style("stroke", function(d) { | |
return "url(#" + getGradID(d) + ")"; | |
}) | |
.style("stroke-opacity", "0.4") | |
.on("mouseover", function() { | |
d3.select(this).style("stroke-opacity", "0.7") | |
}) | |
.on("mouseout", function() { | |
d3.select(this).style("stroke-opacity", "0.4") | |
}) | |
.style("stroke-width", function(d) { | |
return Math.max(1, d.dy); | |
}) | |
.sort(function(a, b) { | |
return b.dy - a.dy; | |
}); | |
// add the link titles | |
link.append("title") | |
.text(function(d) { | |
return d.source.name + " → " + d.target.name + "\n" + format(d.value); | |
}); | |
// add in the nodes | |
var node = svg.append("g").selectAll(".node") | |
.data(graph.nodes) | |
.enter().append("g") | |
.attr("class", "node") | |
.attr("transform", function(d) { | |
return "translate(" + d.x + "," + d.y + ")"; | |
}) | |
.call(d3.behavior.drag() | |
.origin(function(d) { | |
return d; | |
}) | |
.on("dragstart", function() { | |
this.parentNode.appendChild(this); | |
}) | |
.on("drag", dragmove)); | |
// add the rectangles for the nodes | |
node.append("rect") | |
.attr("height", function(d) { | |
return d.dy; | |
}) | |
.attr("width", sankey.nodeWidth()) | |
.style("fill", function(d) { | |
return d.color = color(d.name.replace(/ .*/, "")); | |
}) | |
.style("fill-opacity", ".9") | |
.style("shape-rendering", "crispEdges") | |
.style("stroke", function(d) { | |
//return d3.rgb(d.color).darker(2); | |
}) | |
.append("title") | |
.text(function(d) { | |
return d.name + "\n" + format(d.value); | |
}); | |
// add in the title for the nodes | |
node.append("text") | |
.attr("x", -6) | |
.attr("y", function(d) { | |
return d.dy / 2; | |
}) | |
.attr("dy", ".35em") | |
.attr("text-anchor", "end") | |
.attr("text-shadow", "0 1px 0 #fff") | |
.attr("transform", null) | |
.text(function(d) { | |
return d.name; | |
}) | |
.filter(function(d) { | |
return d.x < width / 2; | |
}) | |
.attr("x", 6 + sankey.nodeWidth()) | |
.attr("text-anchor", "start"); | |
// the function for moving the nodes | |
function dragmove(d) { | |
d3.select(this).attr("transform", | |
"translate(" + ( | |
d.x = Math.max(0, Math.min(width - d.dx, d3.event.x))) + "," + ( | |
d.y = Math.max(0, Math.min(height - d.dy, d3.event.y))) + ")"); | |
sankey.relayout(); | |
link.attr("d", path); | |
positionGrads(); | |
}; | |
function getData() { | |
return { | |
"nodes": [{ | |
"name": "Affiliates" | |
}, { | |
"name": "Aggregator" | |
}, { | |
"name": "Display" | |
}, { | |
"name": "PPC" | |
}, { | |
"name": "SEO" | |
}, { | |
"name": "Affiliates" | |
}, { | |
"name": "Aggregator" | |
}, { | |
"name": "Display" | |
}, { | |
"name": "PPC" | |
}, { | |
"name": "SEO" | |
}, { | |
"name": "Affiliates" | |
}, { | |
"name": "Aggregator" | |
}, { | |
"name": "Display" | |
}, { | |
"name": "PPC" | |
}, { | |
"name": "SEO" | |
}], | |
"links": [{ | |
"source": 0, | |
"target": 5, | |
"value": 6 | |
}, { | |
"source": 0, | |
"target": 7, | |
"value": 2 | |
}, { | |
"source": 0, | |
"target": 9, | |
"value": 1 | |
}, { | |
"source": 1, | |
"target": 5, | |
"value": 1 | |
}, { | |
"source": 1, | |
"target": 7, | |
"value": 25 | |
}, { | |
"source": 1, | |
"target": 8, | |
"value": 1 | |
}, { | |
"source": 2, | |
"target": 6, | |
"value": 2 | |
}, { | |
"source": 2, | |
"target": 7, | |
"value": 203 | |
}, { | |
"source": 2, | |
"target": 8, | |
"value": 1 | |
}, { | |
"source": 3, | |
"target": 7, | |
"value": 1 | |
}, { | |
"source": 3, | |
"target": 8, | |
"value": 1 | |
}, { | |
"source": 7, | |
"target": 11, | |
"value": 162 | |
}, { | |
"source": 7, | |
"target": 12, | |
"value": 43 | |
}, { | |
"source": 7, | |
"target": 10, | |
"value": 13 | |
}, { | |
"source": 5, | |
"target": 10, | |
"value": 9 | |
}, { | |
"source": 5, | |
"target": 11, | |
"value": 4 | |
}, { | |
"source": 9, | |
"target": 11, | |
"value": 3 | |
}, { | |
"source": 6, | |
"target": 12, | |
"value": 3 | |
}, { | |
"source": 7, | |
"target": 13, | |
"value": 2 | |
}, { | |
"source": 9, | |
"target": 10, | |
"value": 1 | |
}, { | |
"source": 8, | |
"target": 11, | |
"value": 1 | |
}, { | |
"source": 9, | |
"target": 12, | |
"value": 1 | |
}, { | |
"source": 8, | |
"target": 13, | |
"value": 1 | |
}, { | |
"source": 9, | |
"target": 14, | |
"value": 1 | |
}, { | |
"source": 2, | |
"target": 11, | |
"value": 68 | |
}, { | |
"source": 0, | |
"target": 10, | |
"value": 7 | |
}, { | |
"source": 1, | |
"target": 12, | |
"value": 7 | |
}, { | |
"source": 3, | |
"target": 11, | |
"value": 4 | |
}, { | |
"source": 4, | |
"target": 11, | |
"value": 4 | |
}, { | |
"source": 2, | |
"target": 10, | |
"value": 3 | |
}, { | |
"source": 2, | |
"target": 12, | |
"value": 3 | |
}, { | |
"source": 1, | |
"target": 10, | |
"value": 1 | |
}, { | |
"source": 3, | |
"target": 10, | |
"value": 1 | |
}, { | |
"source": 0, | |
"target": 11, | |
"value": 1 | |
}, { | |
"source": 1, | |
"target": 13, | |
"value": 1 | |
}, { | |
"source": 4, | |
"target": 13, | |
"value": 1 | |
}, { | |
"source": 1, | |
"target": 14, | |
"value": 1 | |
}] | |
}; | |
} | |
function d3sankey() { | |
var sankey = {}, | |
nodeWidth = 20, | |
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) { | |
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 *= 0.99); | |
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; | |
}; |
This file contains 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
<script src="//cdnjs.cloudflare.com/ajax/libs/d3/3.5.5/d3.min.js"></script> |
This file contains 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
svg { | |
font: 12px sans-serif; | |
} | |
.node rect { | |
cursor: move; | |
fill-opacity: .9; | |
shape-rendering: crispEdges; | |
} | |
.node text { | |
font-size: 14px; | |
pointer-events: none; | |
} | |
.link { | |
fill: none; | |
stroke: #1A237E; | |
stroke-opacity: .2; | |
} | |
.link:hover { | |
stroke-opacity: .5; | |
} |
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