HDC Clipping issues


I am drawing some things in my view.
I wish to draw stuff all over the client window, then set a clip rect, such
as draw a line from one corner of the screen to another, but make sure that
what I draw is only visible on a portion of the view.

CMyView::OnDraw(CDC* pDC) {

    CMyDrawRoutines d;


    CRect rc;

    CRgn rgn;


    d.LineTo(rcClient.right, rcClient.bottom);


The last line draws a line from left upper corner to right lower corner of
the client window, but I want the line to only be drawn within the rectangle
that is deflated 100 from all edges.

This works sortoff, but when my view is covered by another window, and I
drag the window around, the screen does not update well. The problem seems
to be my memory draw routines to prevent flickering (non-MFC)

 BOOL BeginDraw(HDC hDC) {
  if (m_bPrinting || !m_bMemoryDraw) {
   m_hDC = hDC;
  else {
   ::GetClipBox(hDC, &m_rcClip);
   m_hDC  = ::CreateCompatibleDC(hDC);
   m_hBitmap = ::CreateCompatibleBitmap(hDC, m_rcClip.right - m_rcClip.left,
m_rcClip.bottom - m_rcClip.top);
   m_hOldBmp = (HBITMAP)::SelectObject(m_hDC, m_hBitmap);
   ::SetWindowOrgEx(m_hDC, m_rcClip.left, m_rcClip.top, NULL);

  return TRUE;

 void EndDraw(HDC hDC=NULL) {
  if (m_bPrinting || !m_bMemoryDraw) {
   m_bPrinting = FALSE;

  if (hDC == NULL)
   hDC = m_hDC;

  ::BitBlt(hDC, m_rcClip.left, m_rcClip.top, m_rcClip.right - m_rcClip.left,
     m_rcClip.bottom - m_rcClip.top, m_hDC, m_rcClip.left, m_rcClip.top,
  ::SelectObject(m_hDC, m_hOldBmp);

  m_hBitmap = NULL;
  m_hDC = NULL;

Something isn't right with this code. Somehow my clip isn't always working
when portions of the screen gets invalidated by windows moving over my view.
Any clues?

no6060 (315)
10/21/2004 3:05:03 AM
vc.mfc 33608 articles. 0 followers. Follow

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