update method

@override void update()

Implementation

@override
void update() {
  position = rotateFromCenter(position, center, angle);
  angle = angleVelocity; // baseAngle + angleVelocity
  angleVelocity += angleAcceleration;
  if (angleVelocity > 0.1) {
    angleVelocity = .1;
  }
  if (angleVelocity < -0.1) {
    angleVelocity = -.1;
  }
  angleAcceleration = randomDouble(-0.01, 0.01);
}