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svelte/site/content/examples/08-motion/01-spring/App.svelte

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<script>
import { spring } from 'svelte/motion';
let coords = spring({ x: 50, y: 50 }, {
stiffness: 0.1,
damping: 0.25
});
let size = spring(10);
</script>
<div style="position: absolute; right: 1em;">
<label>
<h3>stiffness ({coords.stiffness})</h3>
<input bind:value={coords.stiffness} type="range" min="0" max="1" step="0.01">
</label>
<label>
<h3>damping ({coords.damping})</h3>
<input bind:value={coords.damping} type="range" min="0" max="1" step="0.01">
</label>
</div>
<svg
on:mousemove="{e => coords.set({ x: e.clientX, y: e.clientY })}"
on:mousedown="{() => size.set(30)}"
on:mouseup="{() => size.set(10)}"
>
<circle cx={$coords.x} cy={$coords.y} r={$size}/>
</svg>
<style>
svg { width: 100%; height: 100%; margin: -8px }
circle { fill: #ff3e00 }
</style>