code: public void rotate(double x, double y) {
          if (!(projection instanceof Projection3D)) {
              throw new UnsupportedOperationException("Only 3D graphics supports rotation.");
          }
  
          ((Projection3D) projection).rotate(x, y);
      }
docs: Rotate the 3D view based on the changes on mouse position.
  @param x changes of mouse position on the x axis.
  @param y changes on mouse position on the y axis.