请问各位大大

megaman

1. def draw_actor_graphic(actor, x, y)
   
2.     bitmap = RPG::Cache.character(actor.character_name, actor.character_hue)
   
3.     cw = bitmap.width / 4
   
4.     ch = bitmap.height / 4
   
5.     src_rect = Rect.new(0, 0, cw, ch)
   
6.     self.contents.blt(x - cw / 2, y - ch, bitmap, src_rect)
   
7.   end

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这一段文字哪里是调整坐标的？