为了识别出用户想要旋转的方向和角度，增加了下面的变量：

    enum RotateDirection
    {//鼠标控制的旋转方向
        EAST,
        WEST,
        NORTH,
        SOUTH
    };

    RotateDirection direction;
    CPoint m_pStart;//起点
    CPoint m_pEnd;//终点
    bool isMoseDown;//是否左键还按下

然后就是鼠标的事件处理代码了：

void COpenGLDemoView::OnLButtonDown(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    this->isMoseDown = TRUE;
    this->m_pStart = point;
    this->m_pEnd = point;
    CView::OnLButtonDown(nFlags, point);
}
void COpenGLDemoView::OnLButtonUp(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    this->isMoseDown = FALSE;
    if(this->direction==EAST)
        yspeed+=0.5f;
    else if(this->direction==WEST)
        yspeed-=0.5f;
    else if(this->direction==SOUTH)
        xspeed+=0.5f;
    else if(this->direction==NORTH)
        xspeed-=0.5f;
    CView::OnLButtonUp(nFlags, point);
}

void COpenGLDemoView::OnMouseMove(UINT nFlags, CPoint point)
{
    // TODO: Add your message handler code here and/or call default
    if(this->isMoseDown==false)
    {
        return;
    }
    if(point.x>this->m_pEnd.x)
        this->direction = EAST;
    else if(point.x<this->m_pEnd.x)
        this->direction = WEST;
    else if(point.y>this->m_pEnd.y)
        this->direction = SOUTH;
    else if(point.y<this->m_pEnd.y)
        this->direction = NORTH;

    this->m_pEnd = point;

    CView::OnMouseMove(nFlags, point);
}

      试了下效果，控制上不是很舒适方便，我觉得自己才旋转的方向判断上应该是不对的，到底如何判断旋转方向呢？