310 lines
9.0 KiB
TypeScript
310 lines
9.0 KiB
TypeScript
import type { ContentDetails } from "../../plugins/emitters/contentIndex"
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import * as d3 from "d3"
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import { registerEscapeHandler, removeAllChildren } from "./util"
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import { FullSlug, SimpleSlug, getFullSlug, resolveRelative, simplifySlug } from "../../util/path"
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type NodeData = {
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id: SimpleSlug
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text: string
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tags: string[]
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} & d3.SimulationNodeDatum
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type LinkData = {
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source: SimpleSlug
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target: SimpleSlug
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}
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const localStorageKey = "graph-visited"
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function getVisited(): Set<SimpleSlug> {
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return new Set(JSON.parse(localStorage.getItem(localStorageKey) ?? "[]"))
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}
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function addToVisited(slug: SimpleSlug) {
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const visited = getVisited()
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visited.add(slug)
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localStorage.setItem(localStorageKey, JSON.stringify([...visited]))
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}
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async function renderGraph(container: string, fullSlug: FullSlug) {
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const slug = simplifySlug(fullSlug)
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const visited = getVisited()
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const graph = document.getElementById(container)
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if (!graph) return
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removeAllChildren(graph)
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let {
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drag: enableDrag,
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zoom: enableZoom,
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depth,
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scale,
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repelForce,
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centerForce,
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linkDistance,
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fontSize,
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opacityScale,
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} = JSON.parse(graph.dataset["cfg"]!)
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const data = await fetchData
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const links: LinkData[] = []
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for (const [src, details] of Object.entries<ContentDetails>(data)) {
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const source = simplifySlug(src as FullSlug)
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const outgoing = details.links ?? []
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for (const dest of outgoing) {
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if (dest in data) {
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links.push({ source, target: dest })
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}
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}
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}
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const neighbourhood = new Set<SimpleSlug>()
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const wl: (SimpleSlug | "__SENTINEL")[] = [slug, "__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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neighbourhood.add(cur)
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const outgoing = links.filter((l) => l.source === cur)
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const incoming = links.filter((l) => l.target === 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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Object.keys(data).forEach((id) => neighbourhood.add(simplifySlug(id as FullSlug)))
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}
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const graphData: { nodes: NodeData[]; links: LinkData[] } = {
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nodes: [...neighbourhood].map((url) => ({
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id: url,
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text: data[url]?.title ?? url,
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tags: data[url]?.tags ?? [],
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})),
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links: links.filter((l) => neighbourhood.has(l.source) && neighbourhood.has(l.target)),
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}
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const simulation: d3.Simulation<NodeData, LinkData> = d3
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.forceSimulation(graphData.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(graphData.links)
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.id((d: any) => d.id)
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.distance(linkDistance),
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)
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.force("center", d3.forceCenter().strength(centerForce))
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const height = Math.max(graph.offsetHeight, 250)
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const width = graph.offsetWidth
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const svg = d3
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.select<HTMLElement, NodeData>("#" + 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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// 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(graphData.links)
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.join("line")
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.attr("class", "link")
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.attr("stroke", "var(--lightgray)")
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.attr("stroke-width", 1)
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// svg groups
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const graphNode = svg.append("g").selectAll("g").data(graphData.nodes).enter().append("g")
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// calculate color
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const color = (d: NodeData) => {
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const isCurrent = d.id === slug
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if (isCurrent) {
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return "var(--secondary)"
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} else if (visited.has(d.id)) {
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return "var(--tertiary)"
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} else {
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return "var(--gray)"
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}
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}
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const drag = (simulation: d3.Simulation<NodeData, LinkData>) => {
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function dragstarted(event: any, d: NodeData) {
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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: any, d: NodeData) {
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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: any, d: NodeData) {
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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<Element, NodeData>()
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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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function nodeRadius(d: NodeData) {
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const numLinks = links.filter((l: any) => l.source.id === d.id || l.target.id === d.id).length
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return 2 + Math.sqrt(numLinks)
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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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const targ = resolveRelative(fullSlug, d.id)
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window.spaNavigate(new URL(targ, window.location.toString()))
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})
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.on("mouseover", function (_, d) {
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const neighbours: SimpleSlug[] = data[fullSlug].links ?? []
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const neighbourNodes = d3
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.selectAll<HTMLElement, NodeData>(".node")
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.filter((d) => neighbours.includes(d.id))
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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: any) => 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(--gray)").attr("stroke-width", 1)
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const bigFont = fontSize * 1.5
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// show text for self
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const parent = this.parentNode as HTMLElement
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d3.select<HTMLElement, NodeData>(parent)
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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(parent).select("text").style("opacity"))
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.style("opacity", 1)
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.style("font-size", bigFont + "em")
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})
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.on("mouseleave", function (_, d) {
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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: any) => d.source.id === currentId || d.target.id === currentId)
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linkNodes.transition().duration(200).attr("stroke", "var(--lightgray)")
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const parent = this.parentNode as HTMLElement
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d3.select<HTMLElement, NodeData>(parent)
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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(parent).select("text").attr("opacityOld"))
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.style("font-size", fontSize + "em")
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})
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// @ts-ignore
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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) + "px")
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.attr("text-anchor", "middle")
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.text(
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(d) =>
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data[d.id]?.title ||
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(d.id.charAt(0).toUpperCase() + d.id.slice(1, d.id.length - 1)).replace("-", " "),
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)
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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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// @ts-ignore
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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<SVGSVGElement, NodeData>()
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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: any) => d.source.x)
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.attr("y1", (d: any) => d.source.y)
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.attr("x2", (d: any) => d.target.x)
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.attr("y2", (d: any) => d.target.y)
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node.attr("cx", (d: any) => d.x).attr("cy", (d: any) => d.y)
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labels.attr("x", (d: any) => d.x).attr("y", (d: any) => d.y)
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})
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}
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function renderGlobalGraph() {
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const slug = getFullSlug(window)
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const container = document.getElementById("global-graph-outer")
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const sidebar = container?.closest(".sidebar") as HTMLElement
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container?.classList.add("active")
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if (sidebar) {
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sidebar.style.zIndex = "1"
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}
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renderGraph("global-graph-container", slug)
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function hideGlobalGraph() {
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container?.classList.remove("active")
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const graph = document.getElementById("global-graph-container")
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if (sidebar) {
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sidebar.style.zIndex = "unset"
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}
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if (!graph) return
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removeAllChildren(graph)
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}
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registerEscapeHandler(container, hideGlobalGraph)
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}
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document.addEventListener("nav", async (e: unknown) => {
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const slug = (e as CustomEventMap["nav"]).detail.url
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addToVisited(slug)
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await renderGraph("graph-container", slug)
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const containerIcon = document.getElementById("global-graph-icon")
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containerIcon?.removeEventListener("click", renderGlobalGraph)
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containerIcon?.addEventListener("click", renderGlobalGraph)
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})
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