31:T10e8,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) .attr('opacity', d => // Opacity depends on input/output highlightedOutput && highlightedInput ? highlightedOutput == d.name && highlightedInput == d.category ? 1 : 0.3 : highlightedOutput ? highlightedOutput == d.name ? 1 : 0.3 : highlightedInput ? highlightedInput == d.category ? 1 : 0.3 : 1) // On mouseover of category rect, highlight group .on('mouseover', function(el, d) { // If rect has no sourceLinks, it is the "final" rect if (d.sourceLinks.length == 0) { // If final rect, we want to highlight all sources to the final rect set(viewof highlightedInput, null); set(viewof highlightedOutput, d.name); } else { // Otherwise, we want to highlight all targets set(viewof highlightedInput, d.category); set(viewof highlightedOutput, null); } }) .on('mouseout', function(el, d) { // On mouseout, unhighight all set(viewof highlightedInput, null); set(viewof highlightedOutput, null); }) .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") .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)) // Change opacity based on highlighted .attr('opacity', d => { if (highlightedOutput && highlightedInput) { // If BOTH highlighted (via path highlight) // Highlight those that match source and target if (highlightedOutput == d.target.name && highlightedInput == d.source.category) { return 1 } else { return 0.3 } } else if (highlightedOutput) { // Otherwise, if target matches, highlight if (highlightedOutput == d.target.name) { return 1 } else { return 0.3 } } else if (highlightedInput) { // Otherwise, if source matches, highlight if (highlightedInput == d.source.category) { return 1 } else { return 0.3 } } else { return 1 } }) .attr("stroke-width", d => Math.max(1, d.width)) .on('mouseover', function(el, d) { // On mouseover of path, set highlights to equal source and target set(viewof highlightedInput, d.source.category) set(viewof highlightedOutput, d.target.name) }) .on('mouseout', () => { // On mouseout, unhighlight set(viewof highlightedInput, null) set(viewof highlightedOutput, null) }); 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) .attr("pointer-events", "none") // Remove pointer events so path hovers work .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":1623254097700.922,"size":2267}] 2f:{"title":"Sankey Diagram w/ Highlighting","cells":[{"id":0,"value":"md`# Sankey Diagram w/ Highlighting\n\nThis [Sankey diagram](https://github.com/d3/d3-sankey) is an extension of Mike Bostock's [original Sankey](https://observablehq.com/@d3/sankey-diagram), with path highlighting. \n\nIt leverages [synchronized inputs](https://observablehq.com/@mbostock/synchronized-views), so that in some use cases, you can highlight via dropdown inputs *or* hover interactions.\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":399,"value":"viewof highlightedInput = Inputs.select(data.nodes.map(d => d.category), \n {value: null, label: \"Highlight input\"})","pinned":false,"hidden":false,"mode":"ojs"},{"id":407,"value":"viewof highlightedOutput = Inputs.select(data.nodes.map(d => d.name), \n {value: null, label: \"Highlight output\"})","pinned":false,"hidden":false,"mode":"ojs"},{"id":11,"value":"$31","pinned":true,"hidden":false,"mode":"ojs"},{"id":22,"value":"sankey = {\n const sankey = d3.sankey()\n .nodeId(d => d.name)\n .nodeAlign(d3[`sankey${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)} ${data.units}` : format;\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":16,"value":"color = {\n const color = d3.scaleOrdinal(d3.schemeCategory10);\n return d => color(d.category === undefined ? d.name : d.category);\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":249,"value":"data = {\n const links = await FileAttachment(\"energy.csv\").csv({typed: true});\n const nodes = Array.from(new Set(links.flatMap(l => [l.source, l.target])), name => ({name, category: name.replace(/ .*/, \"\")}));\n return {nodes, links, units: \"TWh\"};\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":95,"value":"width = 954","pinned":true,"hidden":false,"mode":"ojs"},{"id":9,"value":"height = 600","pinned":true,"hidden":false,"mode":"ojs"},{"id":7,"value":"d3 = require(\"d3@6\", \"d3-sankey@0.12\")","pinned":true,"hidden":false,"mode":"ojs"},{"id":397,"value":"function set(input, value) {\n input.value = value;\n input.dispatchEvent(new Event(\"input\"));\n}","pinned":true,"hidden":false,"mode":"ojs"},{"id":320,"value":"import {View} from \"@mbostock/synchronized-views\"","pinned":false,"hidden":false,"mode":"ojs"},{"id":321,"value":"import {disposal} from \"@mbostock/disposal\"","pinned":false,"hidden":false,"mode":"ojs"}],"files":"$W32","stdlib":"1","titling":"auto"}