31:T849,chart = { const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]); const { nodes, links } = sankey(data); svg .append("g") .attr("stroke", "#000") .selectAll("rect") .data(nodes) .join("rect") .attr("x", (d) => d.x0) .attr("y", (d) => d.y0) .attr("height", (d) => d.y1 - d.y0) .attr("width", (d) => d.x1 - d.x0) .attr("fill", color) .on("click", highlight_node_links) .append("title") .text((d) => `${d.name}\n${format(d.value)}`); const link = svg .append("g") .attr("fill", "none") .attr("stroke-opacity", 0.5) .selectAll("g") .data(links) .join("g") .attr("id", function (d, i) { d.id = i; return "link-" + i; }) .style("mix-blend-mode", "multiply"); if (edgeColor === "path") { const gradient = link .append("linearGradient") .attr("id", (d) => (d.uid = DOM.uid("link")).id) .attr("gradientUnits", "userSpaceOnUse") .attr("x1", (d) => d.source.x1) .attr("x2", (d) => d.target.x0); gradient .append("stop") .attr("offset", "0%") .attr("stop-color", (d) => color(d.source)); gradient .append("stop") .attr("offset", "100%") .attr("stop-color", (d) => color(d.target)); } link .append("path") .attr("d", d3.sankeyLinkHorizontal()) .attr("stroke", (d) => edgeColor === "none" ? "#aaa" : edgeColor === "path" ? d.uid : edgeColor === "input" ? color(d.source) : color(d.target) ) .attr("stroke-width", (d) => Math.max(1, d.width)); link .append("title") .text((d) => `${d.source.name} → ${d.target.name}\n${format(d.value)}`); svg .append("g") .attr("font-family", "sans-serif") .attr("font-size", 10) .selectAll("text") .data(nodes) .join("text") .attr("x", (d) => (d.x0 < width / 2 ? d.x1 + 6 : d.x0 - 6)) .attr("y", (d) => (d.y1 + d.y0) / 2) .attr("dy", "0.35em") .attr("text-anchor", (d) => (d.x0 < width / 2 ? "start" : "end")) .text((d) => d.name); return svg.node(); }32:[{"id":"d6774e9422bd72369f195a30d3a6b33ff9d41676cff4d89c93511e1a458efb3cfd16cbb7ce3fecdd8dd2466121e10c9bfe57fd73c7520bf358d352a92b898614","href":"https://static.observableusercontent.com/files/d6774e9422bd72369f195a30d3a6b33ff9d41676cff4d89c93511e1a458efb3cfd16cbb7ce3fecdd8dd2466121e10c9bfe57fd73c7520bf358d352a92b898614","name":"energy.csv","type":"text/csv","lastModified":1620486704507.367,"size":2267}] 2f:{"title":"Sankey Diagram – Path Highlighting","cells":[{"id":0,"value":"md`# Sankey Diagram – Path Highlighting\n\nThis [Sankey diagram](https://github.com/d3/d3-sankey) visualizes the flow of energy: *supplies* are on the left, and *demands* are on the right. Links show how varying amounts of energy are converted or transmitted before being consumed or lost. Data: [Department of Energy & Climate Change](http://www.decc.gov.uk/en/content/cms/tackling/2050/calculator_on/calculator_on.aspx) via [Tom Counsell](https://tamc.github.io/Sankey/)\n\n ### _Added Path Highlighting_ – [StackOverflow](https://stackoverflow.com/questions/19195888/d3-sankey-highlight-all-connected-paths-from-start-to-end/19239735?noredirect=1#comment119213337_19239735)\n`","pinned":false,"hidden":false,"mode":"ojs"},{"id":160,"value":"viewof edgeColor = Object.assign(html``, {\n value: new URLSearchParams(html``.search).get(\"color\") || \"path\"\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":181,"value":"viewof align = Object.assign(html``, {\n value: new URLSearchParams(html``.search).get(\"align\") || \"justify\"\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":11,"value":"$31","pinned":true,"hidden":false,"mode":"ojs"},{"id":281,"value":"function highlight_node_links(ev, node) {\n var remainingNodes = [],\n nextNodes = [];\n\n var stroke_opacity = 0;\n if (d3.select(this).attr(\"data-clicked\") == \"1\") {\n d3.select(this).attr(\"data-clicked\", \"0\");\n stroke_opacity = 0.5;\n } else {\n d3.select(this).attr(\"data-clicked\", \"1\");\n stroke_opacity = 0.9;\n }\n\n var traverse = [\n {\n linkType: \"sourceLinks\",\n nodeType: \"target\"\n },\n {\n linkType: \"targetLinks\",\n nodeType: \"source\"\n }\n ];\n\n traverse.forEach(function (step) {\n node[step.linkType].forEach(function (link) {\n remainingNodes.push(link[step.nodeType]);\n highlight_link(link.id, stroke_opacity);\n });\n\n while (remainingNodes.length) {\n nextNodes = [];\n remainingNodes.forEach(function (node) {\n node[step.linkType].forEach(function (link) {\n nextNodes.push(link[step.nodeType]);\n highlight_link(link.id, stroke_opacity);\n });\n });\n remainingNodes = nextNodes;\n }\n });\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":283,"value":"function highlight_link(id, opacity) {\n d3.select(\"#link-\" + id).style(\"stroke-opacity\", opacity);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":22,"value":"sankey = {\n const sankey = d3.sankey()\n .nodeId(d => d.name)\n .nodeAlign(d3[`sankey${align[0].toUpperCase()}${align.slice(1)}`])\n .nodeWidth(15)\n .nodePadding(10)\n .extent([[1, 5], [width - 1, height - 5]]);\n return ({nodes, links}) => sankey({\n nodes: nodes.map(d => Object.assign({}, d)),\n links: links.map(d => Object.assign({}, d))\n });\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":13,"value":"format = {\n const format = d3.format(\",.0f\");\n return data.units ? d => `${format(d)} ${data.units}` : format;\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":16,"value":"color = {\n const color = d3.scaleOrdinal(d3.schemeCategory10);\n return d => color(d.category === undefined ? d.name : d.category);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":249,"value":"data = {\n const links = await FileAttachment(\"energy.csv\").csv({typed: true});\n const nodes = Array.from(new Set(links.flatMap(l => [l.source, l.target])), name => ({name, category: name.replace(/ .*/, \"\")}));\n return {nodes, links, units: \"TWh\"};\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":95,"value":"width = 954","pinned":true,"hidden":false,"mode":"ojs"},{"id":9,"value":"height = 600","pinned":true,"hidden":false,"mode":"ojs"},{"id":7,"value":"d3 = require(\"d3@6\", \"d3-sankey@0.12\")","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}