class Scene_Menu
  alias main_sketch main
  alias upd_sketch update
  def main
      @sprite_sketch = Sprite.new
      @sprite_sketch.bitmap = Bitmap.new("Sketch/Sk001.png")
      @sprite_sketch.x  = ....
      @sprite_sketch.y  = ....
      @sprite_sketch.opacity  = ....
      main_sketch
      @sprite_sketch.dispose
  end
 
  def update
      upd_sketch

    # terserah mau dibikin kyk gimana animasi sprite_sketchnya
  end

end