mirror of
https://github.com/linsa-io/linsa.git
synced 2026-01-12 12:20:23 +01:00
346 lines
8.7 KiB
TypeScript
346 lines
8.7 KiB
TypeScript
"use client"
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import * as react from "react"
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import * as fg from "@nothing-but/force-graph"
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import { ease, trig, raf } from "@nothing-but/utils"
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import * as schedule from "@/lib/utils/schedule"
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import * as canvas from "@/lib/utils/canvas"
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export type RawGraphNode = {
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name: string
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prettyName: string
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connectedTopics: string[]
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}
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type HSL = [hue: number, saturation: number, lightness: number]
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const COLORS: readonly HSL[] = [
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[3, 86, 64],
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[31, 90, 69],
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[15, 87, 66]
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]
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/* use a plain object instead of Map for faster lookups */
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type ColorMap = { [key: string]: string }
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type HSLMap = Map<fg.graph.Node, HSL>
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const MAX_COLOR_ITERATIONS = 10
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/**
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* Add a color to a node and all its connected nodes.
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*/
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const visitColorNode = (
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prev: fg.graph.Node,
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node: fg.graph.Node,
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hsl_map: HSLMap,
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add: HSL,
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iteration: number = 1
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): void => {
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if (iteration > MAX_COLOR_ITERATIONS) return
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const color = hsl_map.get(node)
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if (!color) {
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hsl_map.set(node, [...add])
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} else {
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const add_strength = MAX_COLOR_ITERATIONS / iteration
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color[0] = (color[0] + add[0] * add_strength) / (1 + add_strength)
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color[1] = (color[1] + add[1] * add_strength) / (1 + add_strength)
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color[2] = (color[2] + add[2] * add_strength) / (1 + add_strength)
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}
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for (const edge of node.edges) {
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const other_node = edge.a === node ? edge.b : edge.a
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if (other_node === prev) continue
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visitColorNode(node, other_node, hsl_map, add, iteration + 1)
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}
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}
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function generateColorMap(nodes: readonly fg.graph.Node[]): ColorMap {
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const hls_map: HSLMap = new Map()
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for (let i = 0; i < nodes.length; i++) {
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const node = nodes[i]!
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const color = COLORS[i % COLORS.length]!
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visitColorNode(node, node, hls_map, color)
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}
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const color_map: ColorMap = {}
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for (const [node, [hue, saturation, lightness]] of hls_map.entries()) {
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color_map[node.key as string] = `${hue} ${saturation}% ${lightness}%`
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}
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return color_map
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}
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function generateNodesFromRawData(raw_data: RawGraphNode[]): [fg.graph.Node[], fg.graph.Edge[]] {
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const nodes_map = new Map<string, fg.graph.Node>()
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const edges: fg.graph.Edge[] = []
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for (const raw of raw_data) {
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const node = fg.graph.zeroNode()
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node.key = raw.name
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node.label = raw.prettyName
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nodes_map.set(raw.name, node)
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}
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for (const raw of raw_data) {
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const node_a = nodes_map.get(raw.name)!
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for (const name_b of raw.connectedTopics) {
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const node_b = nodes_map.get(name_b)!
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const edge = fg.graph.connect(node_a, node_b)
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edges.push(edge)
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}
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}
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const nodes = Array.from(nodes_map.values())
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fg.graph.randomizeNodePositions(nodes, GRAPH_OPTIONS.grid_size)
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return [nodes, edges]
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}
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function filterNodes(
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graph: fg.graph.Graph,
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nodes: readonly fg.graph.Node[],
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edges: readonly fg.graph.Edge[],
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filter: string
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): void {
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if (filter === "") {
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graph.nodes = nodes.slice()
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graph.edges = edges.slice()
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fg.graph.resetGraphGrid(graph.grid, graph.nodes)
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return
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}
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// regex matching all letters of the filter (out of order)
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const regex = new RegExp(filter.split("").join(".*"), "i")
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graph.nodes = nodes.filter(node => regex.test(node.label))
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graph.edges = edges.filter(edge => regex.test(edge.a.label) && regex.test(edge.b.label))
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fg.graph.resetGraphGrid(graph.grid, graph.nodes)
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}
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const GRAPH_OPTIONS: fg.graph.Options = {
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min_move: 0.001,
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inertia_strength: 0.3,
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origin_strength: 0.01,
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repel_distance: 40,
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repel_strength: 2,
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link_strength: 0.015,
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grid_size: 500
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}
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const TITLE_SIZE_PX = 400
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const simulateGraph = (
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alpha: number,
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graph: fg.graph.Graph,
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canvas: fg.canvas.CanvasState,
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vw: number,
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vh: number
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): void => {
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alpha = alpha / 10 // slow things down a bit
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fg.graph.simulate(graph, alpha)
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/*
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Push nodes away from the center (the title)
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*/
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let grid_radius = graph.grid.size / 2
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let origin_x = grid_radius + canvas.translate.x
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let origin_y = grid_radius + canvas.translate.y
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let vmax = Math.max(vw, vh)
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let push_radius =
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(Math.min(TITLE_SIZE_PX, vw / 2, vh / 2) / vmax) * (graph.grid.size / canvas.scale) +
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80 /* additional margin for when scrolled in */
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for (let node of graph.nodes) {
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let dist_x = node.position.x - origin_x
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let dist_y = (node.position.y - origin_y) * 2
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let dist = Math.sqrt(dist_x * dist_x + dist_y * dist_y)
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if (dist > push_radius) continue
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let strength = ease.in_expo((push_radius - dist) / push_radius)
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node.velocity.x += strength * (node.position.x - origin_x) * 10 * alpha
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node.velocity.y += strength * (node.position.y - origin_y) * 10 * alpha
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}
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}
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const drawGraph = (canvas: fg.canvas.CanvasState, color_map: ColorMap): void => {
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fg.canvas.resetFrame(canvas)
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fg.canvas.drawEdges(canvas)
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/*
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Draw text nodes
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*/
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let { ctx, graph } = canvas
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let { width, height } = canvas.ctx.canvas
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let max_size = Math.max(width, height)
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ctx.textAlign = "center"
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ctx.textBaseline = "middle"
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for (let node of graph.nodes) {
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let opacity = 0.6 + ((node.mass - 1) / 50) * 4
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ctx.font = `${max_size / 200 + (((node.mass - 1) / 5) * (max_size / 100)) / canvas.scale}px sans-serif`
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ctx.fillStyle =
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node.anchor || canvas.hovered_node === node
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? `rgba(129, 140, 248, ${opacity})`
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: `hsl(${color_map[node.key as string]} / ${opacity})`
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ctx.fillText(
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node.label,
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(node.position.x / graph.grid.size) * max_size,
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(node.position.y / graph.grid.size) * max_size
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)
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}
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}
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class State {
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ctx: CanvasRenderingContext2D | null = null
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nodes: fg.graph.Node[] = []
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edges: fg.graph.Edge[] = []
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graph: fg.graph.Graph = fg.graph.makeGraph(GRAPH_OPTIONS, [], [])
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gestures: fg.canvas.CanvasGestures | null = null
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loop: raf.AnimationLoop | null = null
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bump_end = 0
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alpha = 9
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frame_iter_limit = raf.frameIterationsLimit()
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schedule_filter = schedule.scheduleIdle(filterNodes)
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ro: ResizeObserver = new ResizeObserver(() => {})
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}
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function init(
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s: State,
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props: {
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onNodeClick: (name: string) => void
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raw_nodes: RawGraphNode[]
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canvas_el: HTMLCanvasElement | null
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}
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) {
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let { canvas_el, raw_nodes } = props
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if (canvas_el == null) return
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s.ctx = canvas_el.getContext("2d")
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if (s.ctx == null) return
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;[s.nodes, s.edges] = generateNodesFromRawData(raw_nodes)
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let color_map = generateColorMap(s.nodes)
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s.graph = fg.graph.makeGraph(GRAPH_OPTIONS, s.nodes.slice(), s.edges.slice())
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let canvas_state = fg.canvas.canvasState({
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ctx: s.ctx,
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graph: s.graph,
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max_scale: 3,
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init_scale: 1.7,
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init_grid_pos: trig.ZERO
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})
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s.ro = new ResizeObserver(() => {
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if (canvas.resizeCanvasToDisplaySize(canvas_el)) {
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fg.canvas.updateTranslate(canvas_state, canvas_state.translate.x, canvas_state.translate.y)
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}
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})
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s.ro.observe(canvas_el)
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let loop = (s.loop = raf.makeAnimationLoop(time => {
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let is_active = gestures.mode.type === fg.canvas.Mode.DraggingNode
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let iterations = raf.calcIterations(s.frame_iter_limit, time)
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for (let i = Math.min(iterations, 2); i >= 0; i--) {
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s.alpha = raf.updateAlpha(s.alpha, is_active || time < s.bump_end)
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simulateGraph(s.alpha, s.graph, canvas_state, window.innerWidth, window.innerHeight)
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}
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drawGraph(canvas_state, color_map)
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}))
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raf.loopStart(loop)
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let gestures = (s.gestures = fg.canvas.canvasGestures({
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canvas: canvas_state,
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onGesture: e => {
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switch (e.type) {
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case fg.canvas.GestureEventType.Translate:
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s.bump_end = raf.bump(s.bump_end)
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break
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case fg.canvas.GestureEventType.NodeClick:
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props.onNodeClick(e.node.key as string)
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break
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case fg.canvas.GestureEventType.NodeDrag:
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fg.graph.changeNodePosition(canvas_state.graph.grid, e.node, e.pos.x, e.pos.y)
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break
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}
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}
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}))
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}
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function updateQuery(s: State, filter_query: string) {
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s.schedule_filter.trigger(s.graph, s.nodes, s.edges, filter_query)
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s.bump_end = raf.bump(s.bump_end)
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}
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function cleanup(s: State) {
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s.loop && raf.loopClear(s.loop)
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s.gestures && fg.canvas.cleanupCanvasGestures(s.gestures)
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s.schedule_filter.clear()
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s.ro.disconnect()
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}
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export type ForceGraphProps = {
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onNodeClick: (name: string) => void
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/**
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* Filter the displayed nodes by name.
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*
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* `""` means no filter
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*/
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filter_query: string
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raw_nodes: RawGraphNode[]
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}
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export default function ForceGraphClient(props: ForceGraphProps): react.JSX.Element {
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const [canvas_el, setCanvasEl] = react.useState<HTMLCanvasElement | null>(null)
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const state = react.useRef(new State())
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react.useEffect(() => {
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init(state.current, {
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canvas_el: canvas_el,
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onNodeClick: props.onNodeClick,
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raw_nodes: props.raw_nodes
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})
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}, [canvas_el])
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react.useEffect(() => {
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updateQuery(state.current, props.filter_query)
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}, [props.filter_query])
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react.useEffect(() => {
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return () => cleanup(state.current)
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}, [])
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return (
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<div className="absolute inset-0 overflow-hidden">
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<canvas
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ref={setCanvasEl}
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style={{
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position: "absolute",
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top: "-10%",
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left: "-10%",
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width: "120%",
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height: "120%"
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}}
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/>
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</div>
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)
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}
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