1、切换视图

1、1 增加视图切换按钮，并添加消息响应函数。

void COCCDemoView::OnButtonFrontview()
{//前视图m_View->SetProj(V3d_Yneg);m_View->FitAll();
}void COCCDemoView::OnButtonRearview()
{//后视图m_View->SetProj(V3d_Ypos);m_View->FitAll();
}void COCCDemoView::OnMenuLeftview()
{//左视图m_View->SetProj(V3d_Xneg);m_View->FitAll();
}void COCCDemoView::OnButtonRightview()
{//右视图m_View->SetProj(V3d_Xpos);m_View->FitAll();
}void COCCDemoView::OnMenuTopview()
{//俯视图m_View->SetProj(V3d_Zpos);m_View->FitAll();
}void COCCDemoView::OnButtonUpview()
{//仰视图m_View->SetProj(V3d_Zneg);m_View->FitAll();
}void COCCDemoView::OnMenuAxo()
{//轴视图m_View->SetProj(V3d_XposYnegZpos);m_View->FitAll();
}void COCCDemoView::OnMenuFitall()
{//适应性窗口m_View->FitAll();
}