roadmap/quartz/components/scripts/graph.inline.ts

289 lines
8.3 KiB
TypeScript

import { ContentDetails } from "../../plugins/emitters/contentIndex"
import * as d3 from 'd3'
import { registerEscapeHandler } from "./handler"
type NodeData = {
id: string,
text: string,
tags: string[]
} & d3.SimulationNodeDatum
type LinkData = {
source: string,
target: string
}
function relative(from: string, to: string) {
const pieces = [location.protocol, '//', location.host, location.pathname]
const url = pieces.join('').slice(0, -from.length) + to
return url
}
function removeAllChildren(node: HTMLElement) {
while (node.firstChild) {
node.removeChild(node.firstChild)
}
}
async function renderGraph(container: string, slug: string) {
const graph = document.getElementById(container)
if (!graph) return
removeAllChildren(graph)
let {
drag: enableDrag,
zoom: enableZoom,
depth,
scale,
repelForce,
centerForce,
linkDistance,
fontSize,
opacityScale
} = JSON.parse(graph.dataset["cfg"]!)
const data = await fetchData
const links: LinkData[] = []
for (const [src, details] of Object.entries<ContentDetails>(data)) {
const outgoing = details.links ?? []
for (const dest of outgoing) {
if (src in data && dest in data) {
links.push({ source: src, target: dest })
}
}
}
const neighbourhood = new Set()
const wl = [slug, "__SENTINEL"]
if (depth >= 0) {
while (depth >= 0 && wl.length > 0) {
// compute neighbours
const cur = wl.shift()
if (cur === "__SENTINEL") {
depth--
wl.push("__SENTINEL")
} else {
neighbourhood.add(cur)
const outgoing = links.filter(l => l.source === cur)
const incoming = links.filter(l => l.target === cur)
wl.push(...outgoing.map((l) => l.target), ...incoming.map((l) => l.source))
}
}
} else {
links.flatMap(l => [l.source, l.target]).forEach((id) => neighbourhood.add(id))
}
const graphData: { nodes: NodeData[], links: LinkData[] } = {
nodes: Object.keys(data).filter(id => neighbourhood.has(id)).map(url => ({ id: url, text: data[url]?.title ?? url, tags: data[url]?.tags ?? [] })),
links: links.filter((l) => neighbourhood.has(l.source) && neighbourhood.has(l.target))
}
const simulation: d3.Simulation<NodeData, LinkData> = d3
.forceSimulation(graphData.nodes)
.force("charge", d3.forceManyBody().strength(-100 * repelForce))
.force(
"link",
d3
.forceLink(graphData.links)
.id((d: any) => d.id)
.distance(linkDistance),
)
.force("center", d3.forceCenter().strength(centerForce))
const height = Math.max(graph.offsetHeight, 250)
const width = graph.offsetWidth
const svg = d3
.select<HTMLElement, NodeData>('#' + container)
.append("svg")
.attr("width", width)
.attr("height", height)
.attr('viewBox', [-width / 2 / scale, -height / 2 / scale, width / scale, height / scale])
// draw links between nodes
const link = svg
.append("g")
.selectAll("line")
.data(graphData.links)
.join("line")
.attr("class", "link")
.attr("stroke", "var(--lightgray)")
.attr("stroke-width", 2)
// svg groups
const graphNode = svg.append("g").selectAll("g").data(graphData.nodes).enter().append("g")
// calculate radius
const color = (d: NodeData) => {
// TODO: does this handle the index page
const isCurrent = d.id === slug
return isCurrent ? "var(--secondary)" : "var(--gray)"
}
const drag = (simulation: d3.Simulation<NodeData, LinkData>) => {
function dragstarted(event: any, d: NodeData) {
if (!event.active) simulation.alphaTarget(1).restart()
d.fx = d.x
d.fy = d.y
}
function dragged(event: any, d: NodeData) {
d.fx = event.x
d.fy = event.y
}
function dragended(event: any, d: NodeData) {
if (!event.active) simulation.alphaTarget(0)
d.fx = null
d.fy = null
}
const noop = () => { }
return d3
.drag<Element, NodeData>()
.on("start", enableDrag ? dragstarted : noop)
.on("drag", enableDrag ? dragged : noop)
.on("end", enableDrag ? dragended : noop)
}
function nodeRadius(d: NodeData) {
const numLinks = links.filter((l: any) => l.source.id === d.id || l.target.id === d.id).length
return 2 + Math.sqrt(numLinks)
}
// draw individual nodes
const node = graphNode
.append("circle")
.attr("class", "node")
.attr("id", (d) => d.id)
.attr("r", nodeRadius)
.attr("fill", color)
.style("cursor", "pointer")
.on("click", (_, d) => {
const targ = relative(slug, d.id)
window.spaNavigate(new URL(targ))
})
.on("mouseover", function(_, d) {
const neighbours: string[] = data[slug].links ?? []
const neighbourNodes = d3.selectAll<HTMLElement, NodeData>(".node").filter((d) => neighbours.includes(d.id))
const currentId = d.id
const linkNodes = d3
.selectAll(".link")
.filter((d: any) => d.source.id === currentId || d.target.id === currentId)
// highlight neighbour nodes
neighbourNodes.transition().duration(200).attr("fill", color)
// highlight links
linkNodes.transition().duration(200).attr("stroke", "var(--gray)")
const bigFont = fontSize * 1.5
// show text for self
const parent = this.parentNode as HTMLElement
d3.select<HTMLElement, NodeData>(parent)
.raise()
.select("text")
.transition()
.duration(200)
.attr('opacityOld', d3.select(parent).select('text').style("opacity"))
.style('opacity', 1)
.style('font-size', bigFont + 'em')
})
.on("mouseleave", function(_, d) {
const currentId = d.id
const linkNodes = d3
.selectAll(".link")
.filter((d: any) => d.source.id === currentId || d.target.id === currentId)
linkNodes.transition().duration(200).attr("stroke", "var(--lightgray)")
const parent = this.parentNode as HTMLElement
d3.select<HTMLElement, NodeData>(parent)
.select("text")
.transition()
.duration(200)
.style('opacity', d3.select(parent).select('text').attr("opacityOld"))
.style('font-size', fontSize + 'em')
})
// @ts-ignore
.call(drag(simulation))
// draw labels
const labels = graphNode
.append("text")
.attr("dx", 0)
.attr("dy", (d) => nodeRadius(d) + 8 + "px")
.attr("text-anchor", "middle")
.text((d) => data[d.id]?.title || (d.id.charAt(1).toUpperCase() + d.id.slice(2)).replace("-", " "))
.style('opacity', (opacityScale - 1) / 3.75)
.style("pointer-events", "none")
.style('font-size', fontSize + 'em')
.raise()
// @ts-ignore
.call(drag(simulation))
// set panning
if (enableZoom) {
svg.call(
d3
.zoom<SVGSVGElement, NodeData>()
.extent([
[0, 0],
[width, height],
])
.scaleExtent([0.25, 4])
.on("zoom", ({ transform }) => {
link.attr("transform", transform)
node.attr("transform", transform)
const scale = transform.k * opacityScale;
const scaledOpacity = Math.max((scale - 1) / 3.75, 0)
labels.attr("transform", transform).style("opacity", scaledOpacity)
}),
)
}
// progress the simulation
simulation.on("tick", () => {
link
.attr("x1", (d: any) => d.source.x)
.attr("y1", (d: any) => d.source.y)
.attr("x2", (d: any) => d.target.x)
.attr("y2", (d: any) => d.target.y)
node
.attr("cx", (d: any) => d.x)
.attr("cy", (d: any) => d.y)
labels
.attr("x", (d: any) => d.x)
.attr("y", (d: any) => d.y)
})
}
function renderGlobalGraph() {
const slug = document.body.dataset["slug"]!
renderGraph("global-graph-container", slug)
const container = document.getElementById("global-graph-outer")
container?.classList.add("active")
function hideGlobalGraph() {
container?.classList.remove("active")
const graph = document.getElementById("global-graph-container")
if (!graph) return
removeAllChildren(graph)
}
registerEscapeHandler(container, hideGlobalGraph)
}
document.addEventListener("nav", async (e: unknown) => {
const slug = (e as CustomEventMap["nav"]).detail.url
await renderGraph("graph-container", slug)
const containerIcon = document.getElementById("global-graph-icon")
containerIcon?.removeEventListener("click", renderGlobalGraph)
containerIcon?.addEventListener("click", renderGlobalGraph)
})