Warp Background

1<script lang="ts">
2	import { motion } from "motion-sv";
3	import { cn } from "$UTILS$";
4	import type { Snippet } from "svelte";
5	import type { HTMLAttributes } from "svelte/elements";
6 
7	interface BeamProps {
8		width: string | number;
9		x: string | number;
10		delay: number;
11		duration: number;
12	}
13 
14	interface WarpBackgroundProps extends HTMLAttributes<HTMLDivElement> {
15		children: Snippet;
16		class?: string;
17		perspective?: number;
18		beamsPerSide?: number;
19		beamSize?: number;
20		beamDelayMax?: number;
21		beamDelayMin?: number;
22		beamDuration?: number;
23		gridColor?: string;
24	}
25 
26	let {
27		children,
28		perspective = 100,
29		class: className,
30		beamsPerSide = 3,
31		beamSize = 5,
32		beamDelayMax = 3,
33		beamDelayMin = 0,
34		beamDuration = 3,
35		gridColor = "var(--border)",
36		...props
37	}: WarpBackgroundProps = $props();
38 
39	const generateBeams = () => {
40		const beams = [];
41		const cellsPerSide = Math.floor(100 / beamSize);
42		const step = cellsPerSide / beamsPerSide;
43 
44		for (let i = 0; i < beamsPerSide; i++) {
45			const x = Math.floor(i * step);
46			const delay = Math.random() * (beamDelayMax - beamDelayMin) + beamDelayMin;
47			beams.push({ x, delay });
48		}
49		return beams;
50	};
51 
52	const topBeams = generateBeams();
53	const rightBeams = generateBeams();
54	const bottomBeams = generateBeams();
55	const leftBeams = generateBeams();
56 
57	const containerStyle = $derived(`
58    --perspective: ${perspective}px;
59    --grid-color: ${gridColor};
60    --beam-size: ${beamSize}%;
61  `);
62</script>
63 
64<div class={cn("relative rounded border p-20", className)} {...props}>
65	<div
66		style={containerStyle}
67		class="@container-[size] pointer-events-none absolute top-0 left-0 size-full overflow-hidden [clipPath:inset(0)] perspective-(--perspective) transform-3d"
68	>
69		<!-- top side -->
70		<div
71			class="@container absolute z-20 h-[100cqmax] w-[100cqi] origin-[50%_0%] transform-[rotateX(-90deg)] bg-size-[var(--beam-size)_var(--beam-size)] [background:linear-gradient(var(--grid-color)_0_1px,transparent_1px_var(--beam-size))_50%_-0.5px_/var(--beam-size)_var(--beam-size),linear-gradient(90deg,var(--grid-color)_0_1px,transparent_1px_var(--beam-size))_50%_50%_/var(--beam-size)_var(--beam-size)] transform-3d"
72		>
73			{#each topBeams as beam, index}
74				{@const hue = Math.floor(Math.random() * 360)}
75				{@const ar = Math.floor(Math.random() * 10) + 1}
76				<motion.div
77					style={{
78						"--x": `${beam.x * beamSize}%`,
79						"--width": `${beamSize}%`,
80						"--aspect-ratio": `${ar}`,
81// … truncated