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svelte/site/content/tutorial/12-actions/01-actions/app-a/App.svelte

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<script>
import { spring } from 'svelte/motion';
const coords = spring({ x: 0, y: 0 }, {
stiffness: 0.2,
damping: 0.4
});
function handlePanStart() {
coords.stiffness = coords.damping = 1;
}
function handlePanMove(event) {
coords.update($coords => ({
x: $coords.x + event.detail.dx,
y: $coords.y + event.detail.dy
}));
}
function handlePanEnd(event) {
coords.stiffness = 0.2;
coords.damping = 0.4;
coords.set({ x: 0, y: 0 });
}
</script>
<style>
.box {
--width: 100px;
--height: 100px;
position: absolute;
width: var(--width);
height: var(--height);
left: calc(50% - var(--width) / 2);
top: calc(50% - var(--height) / 2);
border-radius: 4px;
background-color: #ff3e00;
cursor: move;
}
</style>
<div class="box"
on:panstart={handlePanStart}
on:panmove={handlePanMove}
on:panend={handlePanEnd}
style="transform:
translate({$coords.x}px,{$coords.y}px)
rotate({$coords.x * 0.2}deg)"
></div>