31:T978,chart = { const svg = d3.create("svg").attr("viewBox", [0, 0, width, height]); const { nodes, links } = sankey(data); //========================================================= const node = svg .selectAll("g") .data(nodes) .join("g"); node .append("rect") .attr("stroke", "#000") .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) .attr("id", function(d, i) { d.id = i; return "rect-" + i; }) .append("title") .text(d => `${d.name}\n${format(d.value)}`); node .append("text") .attr("font-family", "'Source Sans Pro', sans-serif") .attr("font-size", 12) .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) .attr("id", function(d, i) { d.id = i; return "text-" + i; }); node.on("click", highlight_node_links); //========================================================= const link = svg .append("g") .attr("fill", "none") .attr("stroke-opacity", 0.5) .selectAll("g") .data(links) .join("g") .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("id", function(d, i) { d.id = i; return "link-" + i; }) .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)}`); //========================================================= return svg.node(); }32:T683,function highlight_node_links(ev, node) { var remainingNodes = [], nextNodes = []; if (d3.select(this).attr("data-clicked") == "1") { d3.select(this).attr("data-clicked", "0"); d3.selectAll("path").style("opacity", 1); // back to default d3.selectAll("rect").style("opacity", 1); d3.selectAll("text") .style("opacity", 1) .style("font-size", 12) .style("font-weight", "normal"); return; } else { d3.select(this).attr("data-clicked", "1"); d3.selectAll("path").style("opacity", 0.1); d3.selectAll("rect").style("opacity", 0.1); d3.selectAll("text").style("opacity", 0.1); d3.select(this) .select("rect") .style("opacity", 1); d3.select(this) .select("text") .style("opacity", 1) .style("font-size", 16) .style("font-weight", "bold"); } var traverse = [ { linkType: "sourceLinks", nodeType: "target" }, { linkType: "targetLinks", nodeType: "source" } ]; traverse.forEach(function(step) { node[step.linkType].forEach(function(link) { remainingNodes.push(link[step.nodeType]); d3.select("#link-" + link.id).style("opacity", 1); }); while (remainingNodes.length) { nextNodes = []; remainingNodes.forEach(function(node) { node[step.linkType].forEach(function(link) { nextNodes.push(link[step.nodeType]); d3.select("#link-" + link.id).style("opacity", 1); }); d3.select("#rect-" + node.index).style("opacity", 1); d3.select("#text-" + node.index).style("opacity", 1); }); remainingNodes = nextNodes; } }); }33:[{"id":"d6774e9422bd72369f195a30d3a6b33ff9d41676cff4d89c93511e1a458efb3cfd16cbb7ce3fecdd8dd2466121e10c9bfe57fd73c7520bf358d352a92b898614","href":"https://static.observableusercontent.com/files/d6774e9422bd72369f195a30d3a6b33ff9d41676cff4d89c93511e1a458efb3cfd16cbb7ce3fecdd8dd2466121e10c9bfe57fd73c7520bf358d352a92b898614","name":"energy.csv","type":"text/csv","lastModified":1620681115771.31,"size":2267}] 2f:{"title":"Sankey Diagram with highlighted path","cells":[{"id":0,"value":"md`# Sankey Diagram with highlighted path\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\n* Modified to better highlight selected links from a user click\n* When click is made on a node but by mistake on links that pass through, the click does not trigger anything. Normal. It might be solved with use of drawing order (z-index) ?`","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":false,"hidden":false,"mode":"ojs"},{"id":281,"value":"$32","pinned":true,"hidden":false,"mode":"ojs"},{"id":22,"value":"sankey = {\n const sankey = d3.sankey()\n .nodeId(d => d.name)\n .nodeAlign(d3[`sankey${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)} ${data.units}` : format;\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":16,"value":"color = {\n const color = d3.scaleOrdinal(d3.schemeCategory10);\n return d => color(d.category === undefined ? d.name : d.category);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":249,"value":"data = {\n const links = await FileAttachment(\"energy.csv\").csv({typed: true});\n const nodes = Array.from(new Set(links.flatMap(l => [l.source, l.target])), name => ({name, category: name.replace(/ .*/, \"\")}));\n return {nodes, links, units: \"TWh\"};\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":95,"value":"width = 1000","pinned":true,"hidden":false,"mode":"ojs"},{"id":9,"value":"height = 600","pinned":true,"hidden":false,"mode":"ojs"},{"id":7,"value":"d3 = require(\"d3@6\", \"d3-sankey@0.12\")","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W33","stdlib":"1","titling":"auto"}