backStep canAddPoint cancel checkClosed click Create doubleClick draw initialize m_index MgCmdDrawLines Name needCheckClosed needEnded release touchBegan touchEnded touchMoved ~MgCmdDrawLines

release() virtual void MgCmdDrawLines::release ( ) privatevirtual 销毁对象 实现了 MgCommand. 被 MgCmdDrawPolygon , 以及 MgCmdDrawQuadrangle 重载. 函数调用图: