类 COpenGLControl 的两个实例之间的动态数据交换

在我的另一个问题之后，假设我的类中有两个公共成员数据用作模式：

bool WantToSetRectangle;
bool WantToDrawRectangle;  

而且我还有两个公共成员数据，它们是具有 4 个成员的向量，用于设置矩形和绘制矩形。

vector<int>ViewRectangle;
vector<int>RectangleToDraw; 

这是在每个导航任务(如缩放、平移等(之后运行的类OnDraw函数的实现。

void COpenGLControl::OnDraw(CDC *pDC)
{
// TODO: Camera controls
wglMakeCurrent(hdc,hrc);
glLoadIdentity();
gluLookAt(0,0,1,0,0,0,0,1,0);
glTranslatef(m_fPosX, m_fPosY, 0.0f);
glScalef(m_fZoom,m_fZoom,1.0);
if (WantToSetRectangle)
    setViewRectangle();
if (WantToDrawRectangle)
    DrawRectangleOnTopOfTexture();
wglMakeCurrent(NULL, NULL);
}  

现在我在CDialogEx中创建类COpenGLControl的两个实例：

COpenGLControl m_oglWindow1;
COpenGLControl m_oglWindow2;  

正如您在我另一个问题的第一张照片中看到的那样，m_oglWindow1是较大的窗口，m_oglWindow2是较小的窗口。我设置了两个窗口的模式如下：(这些模式在构造函数中false设置(

m_oglWindow1.WantToSetRectangle = true;
m_oglWindow2.WantToDrawRectangle = true;  

每次调用m_oglWindow1的onDraw函数时，都会设置ViewRectangle。 这些数据应动态传递到 m_oglWindow2 的RectangleToDraw，然后立即调用 m-oglWindow2 的OnDraw函数，以在始终处于Full Extent模式的较小窗口上绘制范围矩形。
请记住，对于像 Fixed Zoom in 这样的任务，我可以轻松地在CDialogEx的按钮单击处理程序中编写以下内容：

void CMyOpenGLTestDlg::OnBnClickedButton4()
{
    // TODO: Add your control notification handler code here
    m_oglWindow1.FixedZoomOut();
    m_oglWindow2.RectangleToDraw = m_oglWindow1.ViewRectangle;
    m_oglWindow2.OnDraw(NULL);
}  

但是在其他任务中，如pan、zoom in to the point和zoom out of the point，使用类COpenGLControl mouse-event handlers实现，我需要类的两个实例之间进行某种实时数据交换：

void COpenGLControl::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if (WantToPan)
{
    if (m_fLastX < 0.0f && m_fLastY < 0.0f)
    {
        m_fLastX = (float)point.x;
        m_fLastY = (float)point.y;
    }
    int diffX = (int)(point.x - m_fLastX);
    int diffY = (int)(point.y - m_fLastY);
    m_fLastX = (float)point.x;
    m_fLastY = (float)point.y;
    if (nFlags & MK_MBUTTON)
    {
        m_fPosX += (float)0.2f*m_fZoomInverse*diffX;
        m_fPosY -= (float)0.2f*m_fZoomInverse*diffY;
    }
    OnDraw(NULL);
}
CWnd::OnMouseMove(nFlags, point);
}
void COpenGLControl::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if (WantToUseZoomTool)
{
    if (nFlags & MK_LBUTTON)
    {
        m_fZoom = 1.05f*m_fZoom;
        m_fZoomInverse = 1/m_fZoom;
        int diffX = (int)(point.x - oglWindowWidth/2);
        int diffY = (int)(point.y - oglWindowHeight/2);
        m_fPosX -= (float)diffX;
        m_fPosY += (float)diffY;
    }
    OnDraw(NULL);
}
CWnd::OnLButtonDown(nFlags, point);
}  
void COpenGLControl::OnRButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if (WantToUseZoomTool)
{
    if (nFlags & MK_RBUTTON)
    {
        m_fZoom = 0.95f*m_fZoom;
        m_fZoomInverse = 1/m_fZoom;
        int diffX = (int)(point.x - oglWindowWidth/2);
        int diffY = (int)(point.y - oglWindowHeight/2);
        m_fPosX -= (float)diffX;
        m_fPosY += (float)diffY;
    }
    OnDraw(NULL);
}
CWnd::OnRButtonDown(nFlags, point);
}