DXF 60 entity visibility undo command. Saves and restores the visible state of a set of entities.
执行撤销操作(抽象方法,子类必须实现)
撤销结果代码
执行重做操作(抽象方法,子类必须实现)
重做结果代码
DXF 60 entity visibility undo command. Saves and restores the visible state of a set of entities.