addRectShape backStep Create initialize m_startPt MgCmdDrawRect Name release touchBegan touchEnded touchMoved

release() virtual void MgCmdDrawRect::release ( ) virtual 销毁对象 实现了 MgCommand. 被 MgCmdDrawCircle, MgCmdDrawDiamond, MgCmdDrawEllipse, MgCmdDrawGrid , 以及 MgCmdDrawSquare 重载. 函数调用图: