| license: mit |
The above example is intended to demonstrate drawing a simple Sankey diagram using v4 of d3.js. It uses Jason Davies' version of the Sankey plugin.
This is one of the code samples for the update to the book D3 Tips and Tricks to version 4 of d3.js.
forked from d3noob's block: Sankey Diagram with v4
forked from fogonwater's block: ignore
| <!DOCTYPE html> | |
| <meta charset="utf-8"> | |
| <title>Web referrals</title> | |
| <style> | |
| body { | |
| font-family: Helvetica; | |
| font-size:0.8em; | |
| } | |
| .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> | |
| <script src="https://d3js.org/d3.v4.min.js"></script> | |
| <script src="sankey.js"></script> | |
| <script> | |
| console.clear() | |
| // set the dimensions and margins of the graph | |
| var margin = {top: 10, right: 10, bottom: 10, left: 10}, | |
| width = 550 - margin.left - margin.right, | |
| height = 800 - margin.top - margin.bottom; | |
| // format variables | |
| var format = d3.format(",.0f"),// zero decimal places | |
| color = d3.scaleOrdinal(d3.schemeCategory10); | |
| // append the svg object to the body of 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 + ")"); | |
| // Set the sankey diagram properties | |
| var sankey = d3.sankey() | |
| .nodeWidth(36) | |
| .nodePadding(15) | |
| .size([width, height]); | |
| var path = sankey.link(); | |
| // load the data | |
| d3.json("sankey.json", function(error, graph) { | |
| sankey | |
| .nodes(graph.nodes) | |
| .links(graph.links) | |
| .layout(0); | |
| // add in the links | |
| var link = svg.append("g").selectAll(".link") | |
| .data(graph.links.filter((d)=> d.group != 'Ignore')) | |
| .enter().append("path") | |
| .attr("class", "link") | |
| .attr("d", path) | |
| .style("stroke-width", (d) => Math.max(1, d.dy)) | |
| .style("stroke", (d) => color(d.group)) | |
| .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.filter((d)=> d.group != 'Ignore')) | |
| .enter().append("g") | |
| .attr("class", "node") | |
| .attr("transform", function(d) { | |
| return "translate(" + d.x + "," + d.y + ")"; }) | |
| .call(d3.drag() | |
| .subject(function(d) { | |
| return d; | |
| }) | |
| .on("start", 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", (d) => color(d.group)) | |
| //.style("stroke", (d) => d3.rgb(d.color).darker(2)) | |
| .append("title") | |
| .text((d) => 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("transform", null) | |
| .text((d) => d.name + " " + format(Math.round(d.value))) | |
| .filter((d) => 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 + "," | |
| + (d.y = Math.max( | |
| 0, Math.min(height - d.dy, d3.event.y)) | |
| ) + ")"); | |
| sankey.relayout(); | |
| link.attr("d", path); | |
| } | |
| }); | |
| </script> | |
| </body> | |
| 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; | |
| }; |
| { | |
| "links": [ | |
| { | |
| "group": "Archives", | |
| "source": 0, | |
| "target": 1, | |
| "value": 174113.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 0, | |
| "target": 2, | |
| "value": 136212.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 0, | |
| "target": 3, | |
| "value": 66720.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 0, | |
| "target": 4, | |
| "value": 1646557.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 0, | |
| "target": 5, | |
| "value": 3074722.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 0, | |
| "target": 6, | |
| "value": 4642029.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 7, | |
| "target": 1, | |
| "value": 58389.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 7, | |
| "target": 2, | |
| "value": 121363.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 7, | |
| "target": 3, | |
| "value": 34648.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 7, | |
| "target": 4, | |
| "value": 259410.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 7, | |
| "target": 5, | |
| "value": 374508.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 7, | |
| "target": 6, | |
| "value": 552176.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 8, | |
| "target": 1, | |
| "value": 9227.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 8, | |
| "target": 2, | |
| "value": 6972.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 8, | |
| "target": 3, | |
| "value": 1878.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 8, | |
| "target": 4, | |
| "value": 32771.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 8, | |
| "target": 5, | |
| "value": 97572.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 8, | |
| "target": 6, | |
| "value": 135906.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 9, | |
| "target": 1, | |
| "value": 448.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 9, | |
| "target": 2, | |
| "value": 110782.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 9, | |
| "target": 3, | |
| "value": 18346.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 9, | |
| "target": 4, | |
| "value": 1380.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 9, | |
| "target": 5, | |
| "value": 1478.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 9, | |
| "target": 6, | |
| "value": 51.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 10, | |
| "target": 1, | |
| "value": 2678.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 10, | |
| "target": 2, | |
| "value": 10005.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 10, | |
| "target": 3, | |
| "value": 24690.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 10, | |
| "target": 4, | |
| "value": 27941.0 | |
| }, | |
| { | |
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| "target": 5, | |
| "value": 48752.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 10, | |
| "target": 6, | |
| "value": 41652.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 11, | |
| "target": 1, | |
| "value": 2137.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 11, | |
| "target": 2, | |
| "value": 1401.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
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| "target": 3, | |
| "value": 407.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
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| "value": 7031.0 | |
| }, | |
| { | |
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| "value": 28315.0 | |
| }, | |
| { | |
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| "value": 44378.0 | |
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| { | |
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| "value": 516.0 | |
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| { | |
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| "target": 2, | |
| "value": 45671.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
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| "value": 126.0 | |
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| { | |
| "group": "National Library Online", | |
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| "value": 1125.0 | |
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| { | |
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| "value": 1065.0 | |
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| { | |
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| "value": 701.0 | |
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| { | |
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| "value": 650.0 | |
| }, | |
| { | |
| "group": "Archway", | |
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| "target": 2, | |
| "value": 238.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 13, | |
| "target": 3, | |
| "value": 181.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 13, | |
| "target": 4, | |
| "value": 2049.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 13, | |
| "target": 5, | |
| "value": 9807.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 13, | |
| "target": 6, | |
| "value": 27384.0 | |
| }, | |
| { | |
| "group": "Archives", | |
| "source": 14, | |
| "target": 1, | |
| "value": 187.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 14, | |
| "target": 2, | |
| "value": 231.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 14, | |
| "target": 3, | |
| "value": 2574.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 14, | |
| "target": 4, | |
| "value": 10892.0 | |
| }, | |
| { | |
| "group": "NZHISTORY", | |
| "source": 14, | |
| "target": 5, | |
| "value": 9202.0 | |
| }, | |
| { | |
| "group": "TE ARA", | |
| "source": 14, | |
| "target": 6, | |
| "value": 2831.0 | |
| }, | |
| { | |
| "group": "Archway", | |
| "source": 15, | |
| "target": 2, | |
| "value": 40.0 | |
| }, | |
| { | |
| "group": "DigitalNZ.org", | |
| "source": 15, | |
| "target": 3, | |
| "value": 22.0 | |
| }, | |
| { | |
| "group": "National Library Online", | |
| "source": 15, | |
| "target": 4, | |
| "value": 606.0 | |
| }, | |
| { | |
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