Function springForce

Spring force

// End of spring that moves
let thing = {
 position: { x: 1, y: 0.5 },
 mass: 0.1
};

// Anchored other end of spring
const pinnedAt = {x: 0.5, y: 0.5};

// Create force: length of 0.4
const springForce = Forces.springForce(pinnedAt, 0.4);

continuously(() => {
// Apply force
thing = Forces.apply(thing, springForce);
}).start();
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