CPaintDC pdc(this);
CDC dc;
CBitmap bmp;
bmp.CreateCompatibleBitmap (&pdc, 300, 400);
dc.CreateCompatibleDC (&pdc);
dc.SelectObject (&bmp);
dc.FillRect (CRect(200, 0, 300, 401), &CBrush(RGB(128, 128, 128)));
dc.FillRect (CRect(0, 0, 200, 401), &CBrush(RGB(0, 0, 0)));
dc.FillRect (CRect(210, 10, 283, 130), &CBrush(RGB(0, 0, 0)));
dc.SetTextColor (RGB(255, 255, 255));
dc.SetBkMode (TRANSPARENT);
dc.DrawText ("Next", CRect(210, 10, 283, 40), DT_CENTER | DT_VCENTER | DT_SINGLELINE);
g_pGame->m_pAllBlocks->Draw (&dc, 0, 0);
g_pGame->m_pFallingBlock->Draw (&dc, 0, 0);
g_pGame->m_pNextBlock->Draw (&dc, 228, 40);
pdc.BitBlt (0, 0, 300, 400, &dc, 0, 0, SRCCOPY);
bmp.DeleteObject ();
dc.DeleteDC ();
flicker-free window drawing
Author
I think you're problem might be this:
The call dc.SelectObject(&bmp) should be:
CBitmap* pOldBmp = dc.SelectObject(&bmp);
Then previous to the call bmp.DeleteObject() you should have the following line:
dc.SelectObject(pOldBmp);
Otherwise windows looses the pointer it has to bitmaps it has allocated itself, thus using more resources than required (I think). But, you when using MFC's painting system, whenever you use SelectObject, you must store a pointer to the old resource, and then when you're done painting, reselect the old resource! Anyway, I use the same method to handle flicker-free graphics, so the mehtod you're using should be okay...
Edited by - andresen on August 2, 2000 8:50:24 AM
Edited by - andresen on August 2, 2000 8:53:21 AM
The call dc.SelectObject(&bmp) should be:
CBitmap* pOldBmp = dc.SelectObject(&bmp);
Then previous to the call bmp.DeleteObject() you should have the following line:
dc.SelectObject(pOldBmp);
Otherwise windows looses the pointer it has to bitmaps it has allocated itself, thus using more resources than required (I think). But, you when using MFC's painting system, whenever you use SelectObject, you must store a pointer to the old resource, and then when you're done painting, reselect the old resource! Anyway, I use the same method to handle flicker-free graphics, so the mehtod you're using should be okay...
Edited by - andresen on August 2, 2000 8:50:24 AM
Edited by - andresen on August 2, 2000 8:53:21 AM
This topic is closed to new replies.
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