MapX的滚轮讯息//用什么函数直接放大与缩小

MapX的滚轮消息//用什么函数直接放大与缩小

C/C++ code

这种方法只能调用出来+号放大镜与-号放大镜//不能直接放大 BOOL COtdrClientView::PreTranslateMessage(MSG* pMsg){    // TODO: 在此添加专用代码和/或调用基类    if(pMsg->message==WM_MOUSEWHEEL)    {             short zDelta = HIWORD(pMsg->wParam);         if(zDelta == 120)            m_ctrlMapX.SetCurrentTool(miZoomInTool);//放大标示 miZoomInTool          else if(zDelta == -120)                    m_ctrlMapX.SetCurrentTool(miZoomOutTool);//缩小标示 miZoomOutTool          return 1;    }    return CView::PreTranslateMessage(pMsg);}//-------------//这种方法没效果啊! BOOL COtdrClientView::PreTranslateMessage(MSG* pMsg){    // TODO: 在此添加专用代码和/或调用基类    if(pMsg->message==WM_MOUSEWHEEL)    {         m_ctrlMapX.SetMousewheelSupport(miFullMousewheelSupport);          return 1;    }    return CView::PreTranslateMessage(pMsg);}