分割窗口后，CView 中显示影像

BITMAPINFO *m_pBinfo_Image = (BITMAPINFO *)(new BYTE[sizeof(BITMAPINFOHEADER) + 256*sizeof(RGBQUAD)]);
memset(m_pBinfo_Image, 0, sizeof(BITMAPINFOHEADER) + 256*sizeof(RGBQUAD));
m_pBinfo_Image->bmiHeader.biSize = sizeof(BITMAPINFOHEADER);// + 256*sizeof(RGBQUAD);
m_pBinfo_Image->bmiHeader.biBitCount = 8;
m_pBinfo_Image->bmiHeader.biPlanes   = 1;
m_pBinfo_Image->bmiHeader.biClrUsed  = 256;
m_pBinfo_Image->bmiHeader.biWidth    = CAMERA_WIDTH;
m_pBinfo_Image->bmiHeader.biHeight   = CAMERA_HEIGHT;

RGBQUAD *pColor = m_pBinfo_Image->bmiColors;
int i;
for (i=0;i<256;i++)
{
pColor[i].rgbBlue = pColor[i].rgbGreen = pColor[i].rgbRed = i;
}

void CView1::OnDraw(CDC* pDC)
{
CString str;
CZgMemDC   *pMemDC = new CZgMemDC(pDC);
//BITMAPINFO结构定义了Windows设备无关位图（DIB）的度量和颜色信息
BITMAPINFO *pInfo = m_pBinfo_Image  ;
BYTE *pImgData = m_pImgDataL;//图像内存，
int w  = CAMERA_WIDTH;//图像大小
int h = CAMERA_HEIGHT;
pInfo->bmiHeader.biWidth    = w;
pInfo->bmiHeader.biHeight   = h;

CRect rect;
GetClientRect(&rect);
int cenx = rect.Width()/2;
int ceny = rect.Height()/2;
int x0 = cenx - m_CenX*m_Scale;
int y0 = ceny - (h-1-m_CenY)*m_Scale;

CPen *pPenOld,PenRed,PenGreen;
PenRed.CreatePen(PS_SOLID,1,RGB(255,0,0));
PenGreen.CreatePen(PS_SOLID,1,RGB(0,255,0));
pPenOld = pMemDC->SelectObject(&PenRed);

if( pImgData != NULL )
{
HDC hdc = pMemDC->GetSafeHdc();
CBitmap *pOld = (CBitmap*)pMemDC->SelectObject(pImgData);
SetStretchBltMode(hdc, COLORONCOLOR);
StretchDIBits(hdc,
x0, y0, w*m_Scale, h*m_Scale,
0, 0, w, h,
pImgData,
pInfo,
DIB_RGB_COLORS,
SRCCOPY);
pMemDC->SelectObject(pOld);
}

pMemDC->MoveTo(0,ceny); pMemDC->LineTo(cenx*2,ceny);
pMemDC->MoveTo(cenx,0); pMemDC->LineTo(cenx,ceny*2);

pMemDC->SelectObject(pPenOld);
PenRed.DeleteObject();
PenGreen.DeleteObject();
delete pMemDC;

}

BOOL CView1::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
return TRUE;
return CView::OnEraseBkgnd(pDC);
}

double  m_CenX,m_CenY,m_Scale;
double  m_LBD_CenX,m_LBD_CenY;
CPoint  m_LBD_pt;
bool    m_bLBD;

void CView1::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
if (m_bLBD && (nFlags&MK_LBUTTON)==MK_LBUTTON)
{
int w = CAMERA_WIDTH;
int h = CAMERA_HEIGHT;
m_CenX = m_LBD_CenX - (point.x - m_LBD_pt.x)/m_Scale;
m_CenY = m_LBD_CenY + (point.y - m_LBD_pt.y)/m_Scale;
m_CenX = max(0.0,min(w-1.0,m_CenX));
m_CenY = max(0.0,min(h-1.0,m_CenY));
Invalidate(FALSE);
}
CView::OnMouseMove(nFlags, point);
}

BOOL CViewLeft::OnMouseWheel(UINT nFlags, short zDelta, CPoint pt)
{
// TODO: Add your message handler code here and/or call default
if (1)
{
if (zDelta > 0)
{
m_Scale *= 1.1892071150027210667174999705605;
}
else
{
m_Scale /= 1.1892071150027210667174999705605;
}
Invalidate(FALSE);
}
return CView::OnMouseWheel(nFlags, zDelta, pt);
}

void CView1::OnLButtonDown(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_LBD_CenX = m_CenX;
m_LBD_CenY = m_CenY;
m_LBD_pt = point;
m_bLBD = true;
CView::OnLButtonDown(nFlags, point);
}

void CView1::OnLButtonUp(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
m_bLBD = false;
CView::OnLButtonUp(nFlags, point);
}