Time for action – updating our rocket sprite

The game's main loop will call the rocket's update method in every iteration.

1. Inside the empty update method in Rocket.cpp, add the following lines:

   Point position = this->getPosition();
   if (_rotationOrientation == ROTATE_NONE) {
     position.x += _vector.x * dt;
     position.y += _vector.y * dt;
   } else {
     float angle = _angularSpeed * dt;
     Point rotatedPoint = position.rotateByAngle(_pivot, angle);
     position.x = rotatedPoint.x;
     position.y = rotatedPoint.y;
     float rotatedAngle;
     
     Point diff = position;
     diff.subtract(_pivot);
     Point clockwise = diff.getRPerp();
     
     if (_rotationOrientation == ROTATE_COUNTER) {
       rotatedAngle = atan2 (-1 * clockwise.y, -1 * clockwise.x);
     } else {
       rotatedAngle = atan2 (clockwise.y, clockwise.x);
     }
            
     _vector.x = _speed * cos (rotatedAngle);
     _vector.y = _speed * sin (rotatedAngle);
     this->setRotationFromVector();
     
     if (this->getRotation() > 0) {
       this->setRotation...