28:null 29:["$","title",null,{"children":"Sankey diagram | Kelvin Lee | Observable"}] 2e:Tbfe,chart = { // Specify the dimensions of the chart. const width = 928; const height = 600; const format = d3.format(",.0f"); // Create a SVG container. const svg = d3.create("svg") .attr("width", width) .attr("height", height) .attr("viewBox", [0, 0, width, height]) .attr("style", "max-width: 100%; height: auto; font: 10px sans-serif;"); // Constructs and configures a Sankey generator. const sankey = d3.sankey() .nodeId(d => d.name) .nodeAlign(d3[nodeAlign]) // d3.sankeyLeft, etc. .nodeWidth(15) .nodePadding(10) .extent([[1, 5], [width - 1, height - 5]]); // Applies it to the data. We make a copy of the nodes and links objects // so as to avoid mutating the original. const {nodes, links} = sankey({ nodes: data.nodes.map(d => Object.assign({}, d)), links: data.links.map(d => Object.assign({}, d)) }); // Defines a color scale. const color = d3.scaleOrdinal(d3.schemeCategory10); // Creates the rects that represent the nodes. const rect = svg.append("g") .attr("stroke", "#000") .selectAll() .data(nodes) .join("rect") .attr("x", d => d.x0) .attr("y", d => d.y0) .attr("height", d => d.y1 - d.y0) .attr("width", d => d.x1 - d.x0) .attr("fill", d => color(d.category)); // Adds a title on the nodes. rect.append("title") .text(d => `${d.name}\n${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.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" ? 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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","author":"$undefined","summary":"$undefined"},{"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","author":"$undefined","summary":"$undefined"},{"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","author":"$undefined","summary":"$undefined"},{"id":11,"value":"$2e","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":342,"value":"energy2 = await FileAttachment(\"energy-2.csv\").csv({typed: \"auto\"})","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":249,"value":"data = {\n const links = await FileAttachment(\"energy-2.csv\").csv({typed: true});\n const nodes = Array.from(new Set(links.flatMap(l => [l.source, l.target])), name => ({name, category: name.replace(/ .*/, \"\")}));\n return {nodes, links};\n}","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"},{"id":7,"value":"// [d3-sankey](https://github.com/d3/d3-sankey) is not part of the D3 bundle\nd3 = require(\"d3@7\", \"d3-sankey@0.12\")","pinned":true,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined"}],"files":"$W2f","stdlib":"1","titling":"auto"}} 2d:"$2c:body"