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OCX Control Draw Bitmap in OnDraw Function

Posted on 1998-03-03
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Last Modified: 2010-05-18
I am having trouble getting the bitmap to size to the borders of the selection rectangle in the container program when it is dropped on a form. I need it to remain a constant size even when the rcbounds sizes change?  Here is the code I currently have in the OnDraw Function of the Control.

CBitmap bitmap;
CDC dcDisplayMemory;

bitmap.LoadBitmap(IDB_BITMAP);
dcDisplayMemory.CreateCompatibleDC(pdc);
dcDisplayMemory.SelectObject(&bitmap);
pdc->BitBlt(rcBounds.left, rcBounds.top, rcBounds.left + 54, rcBounds.top + 96, &dcDisplayMemory, 0, 0, SRCCOPY);
      
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Question by:wkroy
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Accepted Solution

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chensu earned 20 total points
ID: 1182998
Use the following code.

BITMAP bm;
bitmap.GetBitmap(&bm);
pdc->BitBlt(rcBounds.left, rcBounds.top, bm.bmWidth, bm.bmHeight, &dcDisplayMemory, 0, 0, SRCCOPY);

Or, if you want it to be centered, you can calculate the upper-left corner.
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Author Comment

by:wkroy
ID: 1182999
This is not really what I was looking for.  I was wanting to snap the objects height and width properties to the size of the bitmap
when it is dropped into the comtainer or the control is resized within the container. For example if you drop the Microsoft stock timer
control onto a VB form the control width and height properties size to the clock bitmap size and if it is strectched from the control points
larger than the size of the bitmap it snaps back to the bitmap's size.
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LVL 23

Expert Comment

by:chensu
ID: 1183000
I see.

You can call COleControl::SetInitialSize() in your control's constructor. In addition, you can override COleControl::OnSetExtent() and call COleControl::SetControlSize().
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