2b:null 2c:["$","title",null,{"children":"Sankey diagram | Devin Bayly | Observable"}] 31:Tcb8,chart = { // [d3-sankey](https://github.com/d3/d3-sankey) is not part of the D3 bundle // Specify the dimensions of the chart. const d3 = d3v7; const width = 928; const height = 600; // const format = d3.format(",.0f"); // Create a SVG container. const svg = d3 .create("svg") .attr("width", width) .attr("height", height) .attr("viewBox", [0, 0, width, height]) .attr("style", "max-width: 100%; height: auto; font: 10px sans-serif;"); // Constructs and configures a Sankey generator. const sankey = d3 .sankey() .nodeId((d) => d.name) .nodeAlign(d3[nodeAlign]) // d3.sankeyLeft, etc. .nodeWidth(15) .nodePadding(10) .extent([ [1, 5], [width - 1, height - 5] ]); console.log(sankey); // Applies it to the data. We make a copy of the nodes and links objects // so as to avoid mutating the original. const { nodes, links } = sankey({ nodes: data.nodes.map((d) => Object.assign({}, d)), links: data.links.map((d) => Object.assign({}, d)) }); // Defines a color scale. const color = d3.scaleOrdinal(d3.schemeCategory10); // Creates the rects that represent the nodes. const rect = svg .append("g") .attr("stroke", "#000") .selectAll() .data(nodes) .join("rect") .attr("x", (d) => d.x0) .attr("y", (d) => d.y0) .attr("height", (d) => d.y1 - d.y0) .attr("width", (d) => d.x1 - d.x0) .attr("fill", (d) => color(d.category)); // Adds a title on the nodes. rect.append("title").text((d) => `${d.name}\n${d.value} TWh`); // Creates the paths that represent the links. const link = svg .append("g") .attr("fill", "none") .attr("stroke-opacity", 0.5) .selectAll() .data(links) .join("g") .style("mix-blend-mode", "multiply"); // Creates a gradient, if necessary, for the source-target color option. if (linkColor === "source-target") { const gradient = link .append("linearGradient") .attr("id", (d) => (d.uid = DOM.uid("link")).id) .attr("gradientUnits", "userSpaceOnUse") .attr("x1", (d) => d.source.x1) .attr("x2", (d) => d.target.x0); gradient .append("stop") .attr("offset", "0%") .attr("stop-color", (d) => color(d.source.category)); gradient .append("stop") .attr("offset", "100%") .attr("stop-color", (d) => color(d.target.category)); } link .append("path") .attr("d", d3.sankeyLinkHorizontal()) .attr( "stroke", linkColor === "source-target" ? (d) => d.uid : linkColor === "source" ? (d) => color(d.source.category) : linkColor === "target" ? (d) => color(d.target.category) : linkColor ) .attr("stroke-width", (d) => Math.max(1, d.width)); link .append("title") .text((d) => `${d.source.name} → ${d.target.name}\n${d.value} TWh`); // Adds labels on the nodes. svg .append("g") .selectAll() .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":1781108564855.224,"size":2267}] 2f:{"id":"c2358e2a6a4c55a7","slug":null,"title":"Sankey diagram","thumbnail":"14a6f57e77c4365552ee295e68953f9380f379e00a79f4703d9e2e72ac5acde5","access_level":"public","create_time":"$D2026-06-10T16:22:44.855Z","update_time":"$D2026-06-30T23:35:51.396Z","view_time":null,"first_public_time":"$D2026-06-10T16:22:44.855Z","has_unpublished_edits":null,"fork":{"id":"3ecaa4aaa61dc833","slug":"sankey/2","title":"Sankey diagram","owner":{"id":"863951e3ebe4c0ae","login":"d3","name":"D3"}},"stars":0,"starred":false,"owner":{"type":"team","id":"a160e29293f9b8d0","login":"devinbayly","name":"Devin Bayly","avatar_url":"https://avatars-next.observableusercontent.com/298031e6b8303c3e444bab1c4012a47a7678618423f5f86b941ff634ea65a5b0","tier":"pro_2024","bio":""},"version":388,"publish_version":null,"role":null,"authored":false,"authors":[{"type":"individual","id":"f10b672ee4126523","login":"devinbayly","name":"Devin Bayly","avatar_url":"https://avatars-next.observableusercontent.com/298031e6b8303c3e444bab1c4012a47a7678618423f5f86b941ff634ea65a5b0","tier":null,"bio":""}],"members":[{"type":"team","id":"a160e29293f9b8d0","login":"devinbayly","name":"Devin Bayly","avatar_url":"https://avatars-next.observableusercontent.com/298031e6b8303c3e444bab1c4012a47a7678618423f5f86b941ff634ea65a5b0","tier":"pro_2024","role":"editor"},{"type":"individual","id":"f10b672ee4126523","login":"devinbayly","name":"Devin Bayly","avatar_url":"https://avatars-next.observableusercontent.com/298031e6b8303c3e444bab1c4012a47a7678618423f5f86b941ff634ea65a5b0","tier":null,"role":"editor"}],"comments":[],"custom_thumbnail":false,"trashed":false,"lapsed":null,"subscribed":null,"forks":0,"collection":null,"type":"notebook","body":{"titling":"auto","title":"Sankey diagram","cells":[{"id":0,"value":"

Sankey diagram

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