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';

  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}
/>