public Bullet addBullet(float sX, float sY, float angle) {
   float tX = (float) (sX + (Config.CAMERA_WIDTH * Math.cos(angle * DEG_TO_PI - PI / 2)));
   float tY = (float) (sY + (Config.CAMERA_WIDTH * Math.sin(angle * DEG_TO_PI - PI / 2)));
   return new Bullet(
       new PointF(sX, sY),
       new PointF(tX, tY),
       angle,
       mResourceManager.getBullet(),
       mResourceManager.getVertexBufferObjectManager());
 }