Animated Beam

1<script lang="ts">
2	import { motion } from "motion-sv";
3	import { cn } from "$UTILS$";
4	import type { AnimatedBeamProps } from "./types";
5	import { usePathCalculator } from "./use-path-calculator.svelte";
6	import { useGradientCoordinates } from "./use-gradient-coordinates.svelte";
7	import { useResizeObserver } from "./use-resize-observer.svelte";
8 
9	let {
10		class: className,
11		containerRef,
12		fromRef,
13		toRef,
14		curvature = 0,
15		reverse = false,
16		duration = Math.random() * 3 + 4,
17		delay = 0,
18		pathColor = "gray",
19		pathWidth = 2,
20		pathOpacity = 0.2,
21		gradientStartColor = "#ffaa40",
22		gradientStopColor = "#9c40ff",
23		startXOffset = 0,
24		startYOffset = 0,
25		endXOffset = 0,
26		endYOffset = 0,
27	}: AnimatedBeamProps = $props();
28 
29	// Generate unique ID for gradient
30	// let id = $state(`gradient-${Math.random().toString(36).substring(2, 11)}`);
31	let id = $props.id();
32 
33	// Use path calculator
34	const pathCalculator = usePathCalculator();
35 
36	// Calculate gradient coordinates based on reverse prop
37	const gradientCoordinates = $derived(useGradientCoordinates(reverse));
38 
39	// Update path function
40	const updatePath = () => {
41		pathCalculator.calculatePath(
42			containerRef,
43			fromRef,
44			toRef,
45			curvature,
46			startXOffset,
47			startYOffset,
48			endXOffset,
49			endYOffset
50		);
51	};
52 
53	// Setup resize observer
54	useResizeObserver(() => containerRef, updatePath);
55 
56	// Watch for changes in refs and offsets
57	$effect(() => {
58		updatePath();
59	});
60</script>
61 
62<svg
63	fill="none"
64	width={pathCalculator.svgDimensions.width}
65	height={pathCalculator.svgDimensions.height}
66	xmlns="http://www.w3.org/2000/svg"
67	class={cn("pointer-events-none absolute top-0 left-0 transform-gpu stroke-2", className)}
68	viewBox={`0 0 ${pathCalculator.svgDimensions.width} ${pathCalculator.svgDimensions.height}`}
69>
70	<path
71		d={pathCalculator.pathD}
72		stroke={pathColor}
73		stroke-width={pathWidth}
74		stroke-opacity={pathOpacity}
75		stroke-linecap="round"
76	/>
77	<path
78		d={pathCalculator.pathD}
79		stroke-width={pathWidth}
80		stroke={`url(#${id})`}
81		stroke-opacity="1"
82		stroke-linecap="round"
83	/>
84	<defs>
85		<motion.linearGradient
86			class="transform-gpu"
87			{id}
88			gradientUnits="userSpaceOnUse"
89			initial={{
90				x1: "0%",
91				x2: "0%",
92				y1: "0%",
93				y2: "0%",
94			}}
95			animate={{
96				x1: gradientCoordinates.x1,
97				x2: gradientCoordinates.x2,
98				y1: gradientCoordinates.y1,
99				y2: gradientCoordinates.y2,
100			}}
101			transition={{
102				delay,
103				duration,
104				ease: [0.16, 1, 0.3, 1],
105				repeat: Infinity,
106// … truncated