_context _id _parent _refcount _shape _tag addRef clone context getID getParent getTag getType MgShapeExt release setContext setParent setTag shape shapec ~MgShapeExt

setTag() void MgShapeExt::setTag ( int  tag ) virtual 设置应用程序自定义标记，可由此扩展数据 实现了 MgShape.