async function drawGraph(baseUrl, isHome, pathColors, graphConfig) {
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let {
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depth,
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enableDrag,
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enableLegend,
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enableZoom,
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opacityScale,
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scale,
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repelForce,
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fontSize } = graphConfig;
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const container = document.getElementById("graph-container")
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const { index, links, content } = await fetchData
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// Use .pathname to remove hashes / searchParams / text fragments
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const cleanUrl = window.location.origin + window.location.pathname
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const curPage = cleanUrl.replace(/\/$/g, "").replace(baseUrl, "")
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const parseIdsFromLinks = (links) => [
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...new Set(links.flatMap((link) => [link.source, link.target])),
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]
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// Links is mutated by d3. We want to use links later on, so we make a copy and pass that one to d3
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// Note: shallow cloning does not work because it copies over references from the original array
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const copyLinks = JSON.parse(JSON.stringify(links))
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const neighbours = new Set()
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const wl = [curPage || "/", "__SENTINEL"]
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if (depth >= 0) {
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while (depth >= 0 && wl.length > 0) {
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// compute neighbours
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const cur = wl.shift()
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if (cur === "__SENTINEL") {
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depth--
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wl.push("__SENTINEL")
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} else {
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neighbours.add(cur)
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const outgoing = index.links[cur] || []
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const incoming = index.backlinks[cur] || []
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wl.push(...outgoing.map((l) => l.target), ...incoming.map((l) => l.source))
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}
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}
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} else {
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parseIdsFromLinks(copyLinks).forEach((id) => neighbours.add(id))
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}
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const data = {
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nodes: [...neighbours].map((id) => ({ id })),
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links: copyLinks.filter((l) => neighbours.has(l.source) && neighbours.has(l.target)),
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}
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const color = (d) => {
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if (d.id === curPage || (d.id === "/" && curPage === "")) {
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return "var(--g-node-active)"
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}
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for (const pathColor of pathColors) {
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const path = Object.keys(pathColor)[0]
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const colour = pathColor[path]
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if (d.id.startsWith(path)) {
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return colour
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}
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}
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return "var(--g-node)"
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}
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const drag = (simulation) => {
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function dragstarted(event, d) {
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if (!event.active) simulation.alphaTarget(1).restart()
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d.fx = d.x
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d.fy = d.y
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}
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function dragged(event, d) {
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d.fx = event.x
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d.fy = event.y
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}
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function dragended(event, d) {
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if (!event.active) simulation.alphaTarget(0)
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d.fx = null
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d.fy = null
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}
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const noop = () => { }
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return d3
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.drag()
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.on("start", enableDrag ? dragstarted : noop)
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.on("drag", enableDrag ? dragged : noop)
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.on("end", enableDrag ? dragended : noop)
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}
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const height = Math.max(container.offsetHeight, isHome ? 500 : 250)
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const width = container.offsetWidth
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const simulation = d3
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.forceSimulation(data.nodes)
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.force("charge", d3.forceManyBody().strength(-100 * repelForce))
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.force(
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"link",
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d3
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.forceLink(data.links)
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.id((d) => d.id)
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.distance(40),
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)
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.force("center", d3.forceCenter())
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const svg = d3
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.select("#graph-container")
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.append("svg")
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.attr("width", width)
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.attr("height", height)
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.attr('viewBox', [-width / 2 / scale, -height / 2 / scale, width / scale, height / scale])
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if (enableLegend) {
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const legend = [{ Current: "var(--g-node-active)" }, { Note: "var(--g-node)" }, ...pathColors]
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legend.forEach((legendEntry, i) => {
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const key = Object.keys(legendEntry)[0]
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const colour = legendEntry[key]
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svg
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.append("circle")
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.attr("cx", -width / 2 + 20)
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.attr("cy", height / 2 - 30 * (i + 1))
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.attr("r", 6)
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.style("fill", colour)
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svg
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.append("text")
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.attr("x", -width / 2 + 40)
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.attr("y", height / 2 - 30 * (i + 1))
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.text(key)
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.style("font-size", "15px")
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.attr("alignment-baseline", "middle")
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})
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}
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// draw links between nodes
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const link = svg
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.append("g")
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.selectAll("line")
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.data(data.links)
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.join("line")
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.attr("class", "link")
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.attr("stroke", "var(--g-link)")
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.attr("stroke-width", 2)
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.attr("data-source", (d) => d.source.id)
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.attr("data-target", (d) => d.target.id)
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// svg groups
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const graphNode = svg.append("g").selectAll("g").data(data.nodes).enter().append("g")
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// calculate radius
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const nodeRadius = (d) => {
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const numOut = index.links[d.id]?.length || 0
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const numIn = index.backlinks[d.id]?.length || 0
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return 2 + Math.sqrt(numOut + numIn)
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}
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// draw individual nodes
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const node = graphNode
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.append("circle")
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.attr("class", "node")
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.attr("id", (d) => d.id)
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.attr("r", nodeRadius)
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.attr("fill", color)
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.style("cursor", "pointer")
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.on("click", (_, d) => {
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// SPA navigation
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const targ = `${baseUrl}${decodeURI(d.id).replace(/\s+/g, "-")}/`
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window.Million.navigate(new URL(targ), ".singlePage")
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plausible("Link Click", {
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props: {
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href: targ,
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broken: false,
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internal: true,
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graph: true,
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}
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})
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})
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.on("mouseover", function(_, d) {
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d3.selectAll(".node").transition().duration(100).attr("fill", "var(--g-node-inactive)")
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const neighbours = parseIdsFromLinks([
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...(index.links[d.id] || []),
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...(index.backlinks[d.id] || []),
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])
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const neighbourNodes = d3.selectAll(".node").filter((d) => neighbours.includes(d.id))
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const currentId = d.id
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window.Million.prefetch(new URL(`${baseUrl}${decodeURI(d.id).replace(/\s+/g, "-")}/`))
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const linkNodes = d3
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.selectAll(".link")
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.filter((d) => d.source.id === currentId || d.target.id === currentId)
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// highlight neighbour nodes
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neighbourNodes.transition().duration(200).attr("fill", color)
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// highlight links
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linkNodes.transition().duration(200).attr("stroke", "var(--g-link-active)")
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const bigFont = fontSize * 1.5
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// show text for self
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d3.select(this.parentNode)
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.raise()
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.select("text")
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.transition()
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.duration(200)
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.attr('opacityOld', d3.select(this.parentNode).select('text').style("opacity"))
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.style('opacity', 1)
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.style('font-size', bigFont + 'em')
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.attr('dy', d => nodeRadius(d) + 20 + 'px') // radius is in px
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})
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.on("mouseleave", function(_, d) {
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d3.selectAll(".node").transition().duration(200).attr("fill", color)
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const currentId = d.id
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const linkNodes = d3
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.selectAll(".link")
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.filter((d) => d.source.id === currentId || d.target.id === currentId)
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linkNodes.transition().duration(200).attr("stroke", "var(--g-link)")
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d3.select(this.parentNode)
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.select("text")
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.transition()
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.duration(200)
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.style('opacity', d3.select(this.parentNode).select('text').attr("opacityOld"))
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.style('font-size', fontSize + 'em')
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.attr('dy', d => nodeRadius(d) + 8 + 'px') // radius is in px
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})
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.call(drag(simulation))
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// draw labels
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const labels = graphNode
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.append("text")
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.attr("dx", 0)
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.attr("dy", (d) => nodeRadius(d) + 8 + "px")
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.attr("text-anchor", "middle")
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.text((d) => content[d.id]?.title || (d.id.charAt(1).toUpperCase() + d.id.slice(2)).replace("-", " "))
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.style('opacity', (opacityScale - 1) / 3.75)
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.style("pointer-events", "none")
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.style('font-size', fontSize + 'em')
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.raise()
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.call(drag(simulation))
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// set panning
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if (enableZoom) {
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svg.call(
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d3
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.zoom()
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.extent([
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[0, 0],
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[width, height],
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])
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.scaleExtent([0.25, 4])
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.on("zoom", ({ transform }) => {
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link.attr("transform", transform)
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node.attr("transform", transform)
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const scale = transform.k * opacityScale;
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const scaledOpacity = Math.max((scale - 1) / 3.75, 0)
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labels.attr("transform", transform).style("opacity", scaledOpacity)
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}),
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)
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}
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// progress the simulation
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simulation.on("tick", () => {
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link
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.attr("x1", (d) => d.source.x)
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.attr("y1", (d) => d.source.y)
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.attr("x2", (d) => d.target.x)
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.attr("y2", (d) => d.target.y)
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node.attr("cx", (d) => d.x).attr("cy", (d) => d.y)
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labels.attr("x", (d) => d.x).attr("y", (d) => d.y)
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})
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}
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