@fxshelf/starfield
Version:
Canvas 2D starfield tunnel for React and Vue — perspective fly-through, glitter flashes, additive trails. Zero animation-lib deps. Copy-as-source friendly.
1 lines • 26.7 kB
Source Map (JSON)
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type StarfieldOptions = {\n /** Number of stars. Default `263`. */\n particleCount?: number\n /** Palette slot 1. Default `#ffffff`. */\n color1?: string\n /** Palette slot 2. Default `#ffffff`. */\n color2?: string\n /** Palette slot 3. Default `#ffffff`. */\n color3?: string\n /** Fly-toward speed multiplier. Default `1`. */\n speed?: number\n /** Radial spread (higher = wider field). Default `48`. */\n density?: number\n /** Base star size. Default `8`. */\n starSize?: number\n /** Perspective near clip (0–100 scale). Default `13`. */\n focalDepth?: number\n /** Lateral wobble. Default `0`. */\n turbulence?: number\n /** Overall brightness (0–100). Default `73`. */\n brightness?: number\n /** Twinkle intensity (0–10). Default `4`. */\n glitterIntensity?: number\n /** Trail persistence (0–100). Default `26`. */\n trailAmount?: number\n /** Fly away from camera instead of toward. Default `false`. */\n reverse?: boolean\n}\n\nexport type StarfieldInstance = {\n setOptions(partial: StarfieldOptions): void\n resize(): void\n destroy(): void\n}\n\nexport const DEFAULTS = {\n particleCount: 263,\n color1: '#ffffff',\n color2: '#ffffff',\n color3: '#ffffff',\n speed: 1,\n density: 48,\n starSize: 8,\n focalDepth: 13,\n turbulence: 0,\n brightness: 73,\n glitterIntensity: 4,\n trailAmount: 26,\n reverse: false,\n} as const satisfies Required<StarfieldOptions>\n","import { DEFAULTS, type StarfieldInstance, type StarfieldOptions } from './types'\n\ntype Star = {\n x: number\n y: number\n z: number\n px: number\n py: number\n seed: number\n vmul: number\n colorIdx: number\n flashUntil: number\n nextFlash: number\n}\n\ntype ParsedColor = [number, number, number, number]\n\nfunction parseColor(input: string | null | undefined): ParsedColor {\n if (!input) return [255, 255, 255, 1]\n const s = input.trim()\n if (s.charAt(0) === '#') {\n let hex = s.slice(1)\n if (hex.length === 3) {\n hex = hex\n .split('')\n .map((c) => c + c)\n .join('')\n }\n const num = parseInt(hex, 16)\n return [(num >> 16) & 255, (num >> 8) & 255, num & 255, 1]\n }\n const m = s.match(/rgba?\\(([^)]+)\\)/i)\n if (m?.[1]) {\n const parts = m[1].split(',').map((p) => parseFloat(p.trim()))\n return [parts[0] || 0, parts[1] || 0, parts[2] || 0, parts[3] == null ? 1 : parts[3]]\n }\n return [255, 255, 255, 1]\n}\n\ntype RuntimeConfig = {\n reverse: boolean\n density: number\n stepZ: number\n focalDepth: number\n starScale: number\n turbulence: number\n glitter: number\n brightness: number\n trail: number\n}\n\nfunction toRuntime(options: Required<StarfieldOptions>): RuntimeConfig {\n return {\n reverse: options.reverse,\n density: options.density,\n stepZ: options.speed * 0.0008,\n focalDepth: options.focalDepth / 100,\n starScale: options.starSize * 0.15,\n turbulence: options.turbulence * 0.2,\n glitter: options.glitterIntensity * 0.1,\n brightness: Math.min(1, options.brightness / 100),\n trail: options.trailAmount / 100,\n }\n}\n\n/**\n * Canvas 2D starfield tunnel: stars fly toward (or away from) the camera\n * with perspective projection, optional glitter flashes, and additive trails.\n */\nexport function createStarfield(\n canvas: HTMLCanvasElement,\n options: StarfieldOptions = {},\n): StarfieldInstance {\n let config: Required<StarfieldOptions> = { ...DEFAULTS, ...options }\n const maybeCtx = canvas.getContext('2d')\n if (!maybeCtx) {\n return {\n setOptions() {},\n resize() {},\n destroy() {},\n }\n }\n const ctx = maybeCtx\n\n const container = canvas.parentElement\n let w = 0\n let h = 0\n let dpr = 1\n let stars: Star[] = []\n let elapsed = 0\n let lastT = performance.now()\n let raf: number | null = null\n let destroyed = false\n\n const colorCache = {\n color1: '',\n color2: '',\n color3: '',\n parsed1: [255, 255, 255, 1] as ParsedColor,\n parsed2: [255, 255, 255, 1] as ParsedColor,\n parsed3: [255, 255, 255, 1] as ParsedColor,\n }\n\n function getCachedColors() {\n if (config.color1 !== colorCache.color1) {\n colorCache.color1 = config.color1\n colorCache.parsed1 = parseColor(config.color1)\n }\n if (config.color2 !== colorCache.color2) {\n colorCache.color2 = config.color2\n colorCache.parsed2 = parseColor(config.color2)\n }\n if (config.color3 !== colorCache.color3) {\n colorCache.color3 = config.color3\n colorCache.parsed3 = parseColor(config.color3)\n }\n return colorCache\n }\n\n function makeStar(): Star {\n return {\n x: 0,\n y: 0,\n z: 0,\n px: NaN,\n py: NaN,\n seed: 0,\n vmul: 1,\n colorIdx: 0,\n flashUntil: 0,\n nextFlash: 0,\n }\n }\n\n function resetStar(s: Star, initial = false) {\n const c = toRuntime(config)\n const angle = Math.random() * Math.PI * 2\n const radius = (0.2 + Math.random() * 0.8) * (c.density / 15)\n s.x = Math.cos(angle) * radius\n s.y = Math.sin(angle) * radius\n if (c.reverse) {\n s.z = initial ? c.focalDepth + Math.random() * (1 - c.focalDepth) : c.focalDepth\n } else {\n s.z = initial ? Math.random() : 1.0\n }\n s.px = NaN\n s.py = NaN\n s.seed = Math.random() * 1000\n s.vmul = 0.6 + Math.random() * 0.8\n s.colorIdx = Math.floor(Math.random() * 3)\n s.flashUntil = 0\n s.nextFlash = elapsed + 1 + Math.random() * 4 * (1 / Math.max(0.0001, c.glitter))\n }\n\n function syncCount() {\n const count = Math.max(1, Math.floor(config.particleCount))\n if (stars.length === count) return\n if (stars.length > count) {\n stars.length = count\n return\n }\n while (stars.length < count) {\n const s = makeStar()\n resetStar(s, true)\n stars.push(s)\n }\n }\n\n function resize() {\n if (destroyed) return\n const nextDpr = Math.min(window.devicePixelRatio || 1, 2)\n const rectW =\n container?.clientWidth || container?.getBoundingClientRect().width || canvas.clientWidth\n const rectH =\n container?.clientHeight || container?.getBoundingClientRect().height || canvas.clientHeight\n const nextW = Math.max(1, Math.floor(rectW) || 600)\n const nextH = Math.max(1, Math.floor(rectH) || 400)\n if (w === nextW && h === nextH && dpr === nextDpr) return\n w = nextW\n h = nextH\n dpr = nextDpr\n canvas.width = Math.floor(w * dpr)\n canvas.height = Math.floor(h * dpr)\n canvas.style.width = w + 'px'\n canvas.style.height = h + 'px'\n ctx.setTransform(dpr, 0, 0, dpr, 0, 0)\n ctx.clearRect(0, 0, w, h)\n }\n\n function drawFrame(deltaSec: number) {\n const c = toRuntime(config)\n syncCount()\n const colors = getCachedColors()\n const palette = [colors.parsed1, colors.parsed2, colors.parsed3]\n const rgbStrs = [\n 'rgb(' + palette[0]![0] + ', ' + palette[0]![1] + ', ' + palette[0]![2] + ')',\n 'rgb(' + palette[1]![0] + ', ' + palette[1]![1] + ', ' + palette[1]![2] + ')',\n 'rgb(' + palette[2]![0] + ', ' + palette[2]![1] + ', ' + palette[2]![2] + ')',\n ]\n const cx = w / 2\n const cy = h / 2\n const projScale = Math.min(w, h) * 0.9\n const dt = Math.max(0.001, Math.min(0.1, deltaSec)) * 60\n const keep = Math.pow(Math.min(0.98, Math.max(0, c.trail)), dt)\n const trailAlpha = Math.max(0.02, 1 - keep)\n ctx.globalAlpha = 1\n ctx.globalCompositeOperation = 'destination-out'\n ctx.fillStyle = 'rgba(0, 0, 0, ' + trailAlpha + ')'\n ctx.fillRect(0, 0, w, h)\n ctx.globalCompositeOperation = 'lighter'\n\n for (let i = 0; i < stars.length; i++) {\n const s = stars[i]!\n const vz = c.stepZ * s.vmul * dt\n if (c.reverse) {\n s.z += vz\n if (s.z >= 1.0) {\n resetStar(s)\n continue\n }\n } else {\n s.z -= vz\n if (s.z <= c.focalDepth) {\n resetStar(s)\n continue\n }\n }\n let tx = s.x\n let ty = s.y\n if (c.turbulence > 0) {\n const tVal = elapsed * 1.2 + s.seed\n const amp = c.turbulence * (1 - s.z) * 0.25\n tx += Math.sin(tVal + s.seed) * amp\n ty += Math.cos(tVal * 1.13 + s.seed * 0.7) * amp\n }\n const persp = c.focalDepth / Math.max(s.z, 0.0001)\n const sx = cx + tx * persp * projScale\n const sy = cy + ty * persp * projScale\n if (!c.reverse && (sx < -20 || sx > w + 20 || sy < -20 || sy > h + 20)) {\n resetStar(s)\n continue\n }\n let flashMult = 1\n if (c.glitter > 0) {\n if (elapsed >= s.nextFlash && s.flashUntil < elapsed) {\n s.flashUntil = elapsed + 0.04 + Math.random() * 0.07\n s.nextFlash = elapsed + 1 + Math.random() * 4 * (1 / Math.max(0.0001, c.glitter))\n }\n if (elapsed <= s.flashUntil) {\n flashMult = 1 + 2.5 * c.glitter\n }\n }\n const sizePersp = Math.min(2.5, (c.focalDepth / Math.max(s.z, 0.0001)) * 0.6)\n const baseR = Math.max(0.25, c.starScale * (0.4 + sizePersp))\n const maxR = 1 + c.starScale * 2.5\n const r = Math.min(baseR * flashMult, maxR)\n const lifeT = c.reverse ? s.z : 1 - s.z\n const fadeIn = c.reverse\n ? Math.min(1, (s.z - c.focalDepth) / (1 - c.focalDepth) / 0.12)\n : 1\n const a =\n Math.min(1, c.reverse ? 0.85 - lifeT * 0.6 : lifeT * 0.9 + 0.05) *\n fadeIn *\n c.brightness *\n (flashMult > 1 ? 1 : 0.85)\n const colStr = rgbStrs[s.colorIdx]!\n if (!Number.isNaN(s.px) && !Number.isNaN(s.py)) {\n ctx.globalAlpha = a * 0.5\n ctx.strokeStyle = colStr\n ctx.lineWidth = Math.max(0.4, r * 0.4)\n ctx.beginPath()\n ctx.moveTo(s.px, s.py)\n ctx.lineTo(sx, sy)\n ctx.stroke()\n }\n ctx.globalAlpha = a\n ctx.fillStyle = colStr\n ctx.fillRect(sx - r, sy - r, r * 2, r * 2)\n if (flashMult > 1) {\n const rf = Math.min(r * 1.4, maxR * 1.4)\n ctx.globalAlpha = a * 0.5\n ctx.fillRect(sx - rf, sy - rf, rf * 2, rf * 2)\n }\n s.px = sx\n s.py = sy\n }\n ctx.globalAlpha = 1\n ctx.globalCompositeOperation = 'source-over'\n elapsed += Math.min(0.1, Math.max(0, deltaSec))\n }\n\n function loop(t: number) {\n if (destroyed) return\n const deltaSec = (t - lastT) / 1000\n lastT = t\n drawFrame(deltaSec)\n raf = requestAnimationFrame(loop)\n }\n\n syncCount()\n resize()\n raf = requestAnimationFrame(loop)\n\n let resizeObserver: ResizeObserver | null = null\n if (container && typeof ResizeObserver !== 'undefined') {\n resizeObserver = new ResizeObserver(() => resize())\n resizeObserver.observe(container)\n }\n\n return {\n setOptions(partial) {\n config = { ...config, ...partial }\n syncCount()\n },\n resize,\n destroy() {\n destroyed = true\n if (raf != null) cancelAnimationFrame(raf)\n raf = null\n resizeObserver?.disconnect()\n resizeObserver = null\n stars = []\n },\n }\n}\n\nexport { DEFAULTS }\nexport type { StarfieldInstance, StarfieldOptions }\n","'use client'\n\nimport {\n useEffect,\n useRef,\n useState,\n type CSSProperties,\n type ReactNode,\n} from 'react'\nimport {\n createStarfield,\n type StarfieldInstance,\n type StarfieldOptions,\n} from '../core/createStarfield'\n\nexport type StarfieldProps = StarfieldOptions & {\n children?: ReactNode\n className?: string\n style?: CSSProperties\n /** Accessible label for the canvas. */\n ariaLabel?: string\n}\n\nexport function Starfield({\n children,\n className,\n style,\n ariaLabel = 'Starfield background',\n ...options\n}: StarfieldProps) {\n const canvasRef = useRef<HTMLCanvasElement>(null)\n const instanceRef = useRef<StarfieldInstance | null>(null)\n const [initialOptions] = useState(options)\n\n useEffect(() => {\n const canvas = canvasRef.current\n if (!canvas) return\n instanceRef.current = createStarfield(canvas, initialOptions)\n return () => {\n instanceRef.current?.destroy()\n instanceRef.current = null\n }\n }, [initialOptions])\n\n useEffect(() => {\n instanceRef.current?.setOptions(options)\n })\n\n return (\n <div\n className={className}\n style={{ position: 'relative', overflow: 'hidden', ...style }}\n >\n <canvas\n ref={canvasRef}\n aria-label={ariaLabel}\n style={{\n position: 'absolute',\n inset: 0,\n width: '100%',\n height: '100%',\n display: 'block',\n pointerEvents: 'none',\n }}\n />\n {children != null ? (\n <div style={{ position: 'relative', zIndex: 1, height: '100%' }}>\n {children}\n </div>\n ) : null}\n </div>\n )\n}\n\nexport default Starfield"]}