2f:Tcdc,chart = { // Specify the dimensions of the chart. const width = 928; const height = 1000; 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.id) .nodeAlign(d3[nodeAlign]) // d3.sankeyLeft, etc. .nodeWidth(15) .nodePadding(10) .nodeSort((a, b) => a.layer === 0 && b.layer === 0 ? b.sourceLinks.length - a.sourceLinks.length : b.targetLinks.length - a.targetLinks.length) .extent([[1, 5], [width - 1, height - 5]]); // 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)) }); console.log({links}) // 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.id)); // Adds a title on the nodes. rect.append("title") .text(d => `${d.name}\n${format(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.id)); gradient.append("stop") .attr("offset", "100%") .attr("stop-color", d => color(d.target.id)); } link.append("path") .attr("d", d3.sankeyLinkHorizontal()) .attr("stroke", linkColor === "source-target" ? (d) => d.uid : linkColor === "source" ? (d) => color(d.source.id) : linkColor === "target" ? (d) => color(d.target.id) : linkColor) .attr("stroke-width", d => { console.log(d.width, Math.max(1, d.width)) return Math.max(1, d.width); }); link.append("title") .text(d => `${d.source.name} → ${d.target.name}\n${format(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(); }30:[{"id":"4e4e61e4647971e84cdd975a50ae8e7b18cdd37a813b68c88ff30a6388fa5578477678ba277116fef8202670c01cb2c9721be6e268435e5d559b4fc95d73ecdc","href":"https://static.observableusercontent.com/files/4e4e61e4647971e84cdd975a50ae8e7b18cdd37a813b68c88ff30a6388fa5578477678ba277116fef8202670c01cb2c9721be6e268435e5d559b4fc95d73ecdc","name":"carrot-v2.json","type":"application/json","lastModified":1693513075752.297,"size":15828},{"id":"d960daff169300605101eec16ea2fc6a838faafb99a034906b75dc4cfc1799defd82b52843a8faa202908292986c6cf2b6e4ba647b0d6fa905c6427aaac45130","href":"https://static.observableusercontent.com/files/d960daff169300605101eec16ea2fc6a838faafb99a034906b75dc4cfc1799defd82b52843a8faa202908292986c6cf2b6e4ba647b0d6fa905c6427aaac45130","name":"carrot@7.json","type":"application/json","lastModified":1693588372193.536,"size":14197},{"id":"c358a6b0b733a98f5dca58952c644c99901072119469955f37ad3efb574547674feeafef31ba78e0018bada2398f558eba6af07196ea11d29a50a2ada5d6f68f","href":"https://static.observableusercontent.com/files/c358a6b0b733a98f5dca58952c644c99901072119469955f37ad3efb574547674feeafef31ba78e0018bada2398f558eba6af07196ea11d29a50a2ada5d6f68f","name":"carrot@6.json","type":"application/json","lastModified":1693435517502.599,"size":18577},{"id":"a79e079ca77e2d01e372c5189037b133546b2f6d31b220fc46686de9c41e80fa8d1c5052dda9261d32176af8acc40bf3b56311efffa2db2df70207b3d526d726","href":"https://static.observableusercontent.com/files/a79e079ca77e2d01e372c5189037b133546b2f6d31b220fc46686de9c41e80fa8d1c5052dda9261d32176af8acc40bf3b56311efffa2db2df70207b3d526d726","name":"lemon.json","type":"application/json","lastModified":1693435765503.689,"size":15942}] 2d:{"title":"Sankey diagram","cells":[{"id":0,"value":"

Sankey diagram

D3 › Gallery

\n\n# Sankey diagram\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/)","pinned":false,"hidden":false,"mode":"md"},{"id":160,"value":"viewof linkColor = Inputs.select(new Map([\n [\"static\", \"#aaa\"],\n [\"source-target\", \"source-target\"],\n [\"source\", \"source\"],\n [\"target\", \"target\"],\n]), {\n value: new URLSearchParams(html``.search).get(\"color\") || \"source-target\",\n label: \"Link color\"\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":181,"value":"viewof nodeAlign = Inputs.select(new Map([[\"left\", \"sankeyLeft\"], [\"right\", \"sankeyRight\"], [\"center\", \"sankeyCenter\"], [\"justify\", \"sankeyJustify\"]]), {\n value: \"sankeyJustify\",\n label: \"Node alignment\"\n})","pinned":false,"hidden":false,"mode":"ojs"},{"id":11,"value":"$2f","pinned":true,"hidden":false,"mode":"ojs"},{"id":340,"value":"data = FileAttachment(\"carrot@7.json\").json()","pinned":true,"hidden":false,"mode":"ojs"},{"id":7,"value":"// [d3-sankey](https://github.com/d3/d3-sankey) is not part of the D3 bundle\nd3 = require(\"d3@7\", \"d3-sankey@0.12\")","pinned":true,"hidden":false,"mode":"ojs"}],"files":"$W30","stdlib":"1","titling":"auto"}