How do I scale and rotate bitmaps?

Hi JonRead,

Rotation:
http://www.codeguru.com/bitmap/rotate_bitmap.shtml or
http://www.codeguru.com/bitmap/RotateByShear.shtml
Scaling:
http://www.codeguru.com/bitmap/2_pass_scale.shtml

hope that helps,

ZOPPO

Hi,

  To enlarge the bitmap loaded on a dialog, first put the following code in the else part of IsIconic loop of OnPaint. Here  IDB_BITMAP1 is the bitmap ID,

--------------------------------------------------------------------------------------------

CPaintDC dc(this);
HBITMAP hbitmap = ::LoadBitmap(::AfxGetInstanceHandle(),                                                              MAKEINTRESOURCE(IDB_BITMAP1));
HDC hMemDC = ::CreateCompatibleDC(NULL);
SelectObject(hMemDC, hbitmap);
            ::StretchBlt(dc.m_hDC, 50, 50, width, hieght, hMemDC, 0, 0, 250,250, SRCCOPY);
::DeleteDC(hMemDC);
::DeleteObject(hbitmap);
--------------------------------------------------------------------------------------------
width and hieght variables are of type integer with values 100 each, and they are declared as global.
To increase the size of the bitmap, increase the values of width and hieght.
from wherever is needed and call InvalidateRect fuction from there.

Hope this will help u.

cheers,
Krisp

Hi krisp,

how can you know that JonRead want's to draw the bitmap loaded from resource onto a dialog???

ZOPPO

Thanks for your help.