fn_registry/frontend/functions/ui/use_animated_canvas.md

name, kind, lang, domain, version, purity, signature, description, tags, uses_functions, uses_types, returns, returns_optional, error_type, imports, tested, tests, test_file_path, file_path, props, emits, has_state, framework, variant

name	kind	lang	domain	version	purity	signature	description	tags	uses_functions	uses_types	returns	returns_optional	error_type	imports	tested	tests	test_file_path	file_path	props	emits	has_state	framework	variant
use_animated_canvas	component	ts	ui	1.0.0	impure	useAnimatedCanvas(options: AnimatedCanvasOptions): AnimatedCanvasResult	Hook React para canvas animado a N fps via requestAnimationFrame. Maneja DPR, resize, throttling, y contador de FPS real.	canvas animation fps requestAnimationFrame hook realtime component ui				false		react	false			frontend/functions/ui/use_animated_canvas.tsx	name type required description fps number false Target FPS (default 60) name type required description draw (ctx: CanvasRenderingContext2D, width: number, height: number, frameCount: number) => void true Callback de renderizado		true	react	default

Ejemplo

const { canvasRef, renderFpsRef } = useAnimatedCanvas({
  fps: 100,
  draw: (ctx, w, h) => {
    // Dibujar lo que sea a 100fps
    ctx.fillStyle = '#3b82f6'
    ctx.fillRect(0, 0, w * Math.random(), h)
  },
})

return <canvas ref={canvasRef} style={{ width: '100%', height: 300 }} />

Notas

• DPR automático: escala el canvas al devicePixelRatio de la pantalla
• Resize automático: detecta cambios de tamaño via getBoundingClientRect
• Throttle configurable: rAF corre a ~144fps nativo, el hook filtra a N fps
• FPS real: renderFpsRef.current tiene los FPS medidos (no el target)
• drawRef pattern: actualiza el callback sin re-crear el loop de animación