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Rotation

verlet-engine provides helper functions to rotate particles and composites around a center point. These functions are mutable, meaning they directly modify the pos and lastPos of the particles.

rotateParticle​

Rotates a single particle around a center point.

Signature​

rotateParticle(particle, center, angle)

  • particle (Particle): The particle to rotate.
  • center (Vec2): The center point of rotation.
  • angle (number): The angle of rotation in radians.

Example​

import { rotateParticle } from 'verlet-engine';

// Rotate myParticle by 45 degrees around the origin
rotateParticle(myParticle, new Vec2(0, 0), Math.PI / 4);

rotateComposite​

Rotates all particles within a composite around a center point.

Signature​

rotateComposite(composite, center, angle)

  • composite (Composite): The composite to rotate.
  • center (Vec2): The center point of rotation.
  • angle (number): The angle of rotation in radians.

Example​

import { rotateComposite } from 'verlet-engine';

// Rotate myComposite by 90 degrees around its first particle
const centerPoint = myComposite.particles[0].pos;
rotateComposite(myComposite, centerPoint, Math.PI / 2);