class Game_Interpreter
  #--------------------------------------------------------------------------
  # ● ピクチャの色調変更
  #--------------------------------------------------------------------------
  def pic_change_opacity(id,duration , target_opacity,wait_flag)
    screen.pictures[id].start_change_opacity(duration , target_opacity)
    Fiber.yield while screen.pictures[id].co_duration  > 0 if wait_flag
  end
end