289 lines
8.3 KiB
TypeScript
289 lines
8.3 KiB
TypeScript
import { ContentDetails } from "../../plugins/emitters/contentIndex"
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import * as d3 from 'd3'
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import { registerEscapeHandler } from "./handler"
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type NodeData = {
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id: string,
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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: string,
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target: string
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}
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function relative(from: string, to: string) {
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const pieces = [location.protocol, '//', location.host, location.pathname]
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const url = pieces.join('').slice(0, -from.length) + to
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return url
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}
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function removeAllChildren(node: HTMLElement) {
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while (node.firstChild) {
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node.removeChild(node.firstChild)
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}
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}
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async function renderGraph(container: string, slug: string) {
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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 outgoing = details.links ?? []
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for (const dest of outgoing) {
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if (src in data && dest in data) {
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links.push({ source: src, target: dest })
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}
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}
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}
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const neighbourhood = new Set()
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const wl = [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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links.flatMap(l => [l.source, l.target]).forEach((id) => neighbourhood.add(id))
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}
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const graphData: { nodes: NodeData[], links: LinkData[] } = {
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nodes: Object.keys(data).filter(id => neighbourhood.has(id)).map(url => ({ id: url, text: data[url]?.title ?? url, tags: data[url]?.tags ?? [] })),
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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", 2)
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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 radius
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const color = (d: NodeData) => {
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// TODO: does this handle the index page
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const isCurrent = d.id === slug
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return isCurrent ? "var(--secondary)" : "var(--gray)"
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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 = relative(slug, d.id)
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window.spaNavigate(new URL(targ))
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})
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.on("mouseover", function(_, d) {
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const neighbours: string[] = data[slug].links ?? []
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const neighbourNodes = d3.selectAll<HTMLElement, NodeData>(".node").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)")
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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) + 8 + "px")
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.attr("text-anchor", "middle")
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.text((d) => data[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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// @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
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.attr("cx", (d: any) => d.x)
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.attr("cy", (d: any) => d.y)
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labels
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.attr("x", (d: any) => d.x)
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.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 = document.body.dataset["slug"]!
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renderGraph("global-graph-container", slug)
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const container = document.getElementById("global-graph-outer")
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container?.classList.add("active")
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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 (!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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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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