_context _id _parent _refcount _shape _tag addRef clone context create getID getParent getTag getType MgShapeT MgShapeT registerCreator release setContext setParent setTag shape shapec ThisClass Type ~MgShapeT

clone() template<class ShapeT, class ContextT = GiContext> MgObject* MgShapeT< ShapeT, ContextT >::clone ( ) const virtual 复制出一个新对象 实现了 MgObject. 函数调用图: