NetworkGraph

1"use client"
2 
3import * as React from "react"
4import { useFrame } from "@react-three/fiber"
5import * as THREE from "three"
6 
7import {
8  SceneContainer,
9  type SceneContainerProps,
10} from "@/components/threecn/scene-container"
11import {
12  useShadcnTheme,
13  type ThemeMode,
14} from "@/components/hooks/use-shadcn-theme"
15 
16const RADIUS = 2.7
17 
18function seedPositions(count: number) {
19  const positions = new Float32Array(count * 3)
20  for (let i = 0; i < count; i++) {
21    // Uniform-ish distribution inside a sphere.
22    const r = Math.cbrt(Math.random()) * RADIUS * 0.92
23    const theta = Math.random() * Math.PI * 2
24    const phi = Math.acos(2 * Math.random() - 1)
25    positions[i * 3] = r * Math.sin(phi) * Math.cos(theta)
26    positions[i * 3 + 1] = r * Math.sin(phi) * Math.sin(theta)
27    positions[i * 3 + 2] = r * Math.cos(phi)
28  }
29  return positions
30}
31 
32function seedVelocities(count: number) {
33  const velocities = new Float32Array(count * 3)
34  for (let i = 0; i < velocities.length; i++) {
35    velocities[i] = (Math.random() - 0.5) * 0.35
36  }
37  return velocities
38}
39 
40function Graph({
41  nodes,
42  linkDistance,
43  speed,
44  theme,
45}: {
46  nodes: number
47  linkDistance: number
48  speed: number
49  theme: ThemeMode
50}) {
51  const { primaryColor, mutedColor } = useShadcnTheme(theme)
52  const groupRef = React.useRef<THREE.Group>(null)
53  const pointGeoRef = React.useRef<THREE.BufferGeometry>(null)
54  const lineGeoRef = React.useRef<THREE.BufferGeometry>(null)
55  /** Node velocities, re-seeded whenever the position buffer is replaced. */
56  const velocitiesRef = React.useRef<{
57    key: THREE.BufferAttribute
58    values: Float32Array
59  } | null>(null)
60  const tmpColor = React.useMemo(() => new THREE.Color(), [])
61 
62  const maxEdges = nodes * 8
63  const positions = React.useMemo(() => seedPositions(nodes), [nodes])
64  const linePositions = React.useMemo(
65    () => new Float32Array(maxEdges * 6),
66    [maxEdges]
67  )
68  const lineColors = React.useMemo(
69    () => new Float32Array(maxEdges * 6),
70    [maxEdges]
71  )
72 
73  useFrame((_, delta) => {
74    const pointGeo = pointGeoRef.current
75    const lineGeo = lineGeoRef.current
76    if (!pointGeo || !lineGeo) return
77 
78    const posAttr = pointGeo.getAttribute("position") as THREE.BufferAttribute
79    const pos = posAttr.array as Float32Array
80    if (!velocitiesRef.current || velocitiesRef.current.key !== posAttr) {
81      velocitiesRef.current = { key: posAttr, values: seedVelocities(nodes) }
82    }
83    const vel = velocitiesRef.current.values
84 
85// … truncated