Function apply

Apply a series of force functions or forces to t. Null/undefined entries are skipped silently. It also updates the velocity and position of the returned version of t.

// Wind adds acceleration. Force is dampened by mass
const wind = Forces.accelerationForce({ x: 0.00001, y: 0 }, `dampen`);

// Gravity adds acceleration. Force is magnified by mass
const gravity = Forces.accelerationForce({ x: 0, y: 0.0001 }, `multiply`);

// Friction is calculated based on velocity. Force is magnified by mass
const friction = Forces.velocityForce(0.00001, `multiply`);

 // Flip movement velocity if we hit a wall. And dampen it by 10%
const bouncer = Forces.constrainBounce({ width: 1, height: 1 }, 0.9);

let t = {
 position: Points.random(),
 mass: 0.1
};

// Apply list of forces, returning a new version of the thing
t = Forces.apply(t,
  gravity,
  wind,
  friction,
  bouncer
);
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