_points Create draw drawArcHandle initialize MgCmdArc3P Name release setStepPoint touchBegan touchEnded touchMoved

release() virtual void MgCmdArc3P::release ( ) virtual 销毁对象 实现了 MgCommand. 被 MgCmdArcTan, MgCmdCompass , 以及 MgCmdArcCSE 重载.