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path: root/src/lib/Image/ParallaxImage.svelte
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<script lang="ts">
import { cubicOut } from "svelte/easing";
import { tweened } from "svelte/motion";

export let source: string;
export let duration = 300 * 1.75;
export let easing = cubicOut;
export let alternativeText: string;
export let classList = "";
export let style = "";
export let factor = 1.25;
export let limit = 300 * 1.75;
export let borderRadius = "8px";
export let loading: "lazy" | "eager" = "lazy";
export let fetchpriority: "high" | "low" | "auto" | undefined = undefined;
export let width: number | undefined = undefined;
export let height: number | undefined = undefined;

let badgeReference: HTMLImageElement;
const mouse = tweened({ x: 0, y: 0 }, { duration, easing });

const handleMouseMove = (event: MouseEvent) => {
	const boundingRectangle = badgeReference.getBoundingClientRect();

	if ($mouse.x === 0 && $mouse.y === 0)
		$mouse = { x: event.clientX, y: event.clientY };

	$mouse.x +=
		(-(event.clientX - boundingRectangle.left - boundingRectangle.width / 2) -
			$mouse.x) *
		factor;
	$mouse.y +=
		(-(event.clientY - boundingRectangle.top - boundingRectangle.height / 2) -
			$mouse.y) *
		factor;
	$mouse.x = Math.max(Math.min($mouse.x, limit), -limit);
	$mouse.y = Math.max(Math.min($mouse.y, limit), -limit);
};

const handleMouseLeave = () => {
	$mouse = { x: 0, y: 0 };
};
</script>

<img
  src={source}
  bind:this={badgeReference}
  style={`transform: perspective(1000px) rotateX(${$mouse.y / 10}deg) rotateY(${
    -$mouse.x / 10
  }deg); border-radius: ${borderRadius}; ${style}`}
  alt={alternativeText}
  onmousemove={handleMouseMove}
  onmouseleave={handleMouseLeave}
  class={classList}
  {loading}
  {fetchpriority}
  decoding="async"
  {width}
  {height}
/>