C / C++ / MFC

HRESULT ClassName::GetRotatedBitmapNT(/*[in]*/const CBitmap* pcbmBitmap, /*[out]*/CBitmap* &pcbmRotated, /*[in]*/float radians )
{
/*
Remarks:	A rotation is first applied to the corner co-ods of the input bitmap wrapped using the top-left
			corner as the 0,0 point. This gives a new set of corner co-od's from which the minimum amd maximum
			X and Y values can be found and the size of a bitmap required to contain a rotated bitmap with no 
			clipping of the corners can be found.

			A DIB bitmap of this size is then created and both this and the input bitmap are selected into 
			respectivew DC's. The background of the DIB being painted black its origin being altered to the
			minimum X and Y already found, these being -ve so that in the diagram below the 0,0 points
			of both bitmaps coincide. 

				origin2 xmin	0															xmax
						\	|	|															|
						  \					bitmap to hold rotated bitmap						
					ymin--	-----------------------------------------------------------------
							|																|
					0	--	|	---------------------------------------------------------	|
							|	|\					input bitmap						|	|
							|	| \														|	|
							|	|  \													|	|
							|	|	origin1												|	|
							|	|														|	|
							|	|														|	|
							|	|														|	|
							|	|														|	|
							|	|														|	|
							|	|														|	|
							|	|														|	|
							|	---------------------------------------------------------	|
							|																|
					ymax--	-----------------------------------------------------------------

			The World transform of the second DC is set to the transfor originally computed and when the input(1)
			is BitBlt'ed to the larger(2), this transform is applied to each pixel so that the whole bitmap is
			rotated, fitting nicely into the second bitmap. The second bitmap is then wrapped by a CBitmap
			and the [out] CBitmap* pcbmRotated set to point to it.
			[out] parameter

						
*/

// Select source and destination bitmaps into their respective DC's
HBITMAP hbmOldSource = (HBITMAP)::SelectObject( hSourceDC, hBitmap );
HBITMAP hbmOldDest = (HBITMAP)::SelectObject( hDestDC, hbmResult );

// Draw the background color before changing mapping mode
HBRUSH hbrBack = CreateSolidBrush( clrBack );
HBRUSH hbrOld = (HBRUSH)::SelectObject( hDestDC, hbrBack );
PatBlt(hDestDC, 0, 0, (int)newwidth, (int)newheight, PATCOPY );
::DeleteObject( ::SelectObject( hDestDC, hbrOld ) );

BOOL bRet;
POINT OldSourceOrg;
POINT OldDestOrg;

bRet = OffsetWindowOrgEx(hDestDC,(int)xmin, (int)ymin, &OldDestOrg);

float C = (float)cos(radians);
float S = (float)sin(radians);

float T11 =  C;
float T12 =  S;
float T13 =  0;//- x;

float T21 =  -S;
float T22 =  C;
float T23 =  0;//- y;

// Use world transform to rotate the bitmap
// Set the advanced graphics mode to allow world transformations.
SetGraphicsMode(hDestDC, GM_ADVANCED);

// Set a two-dimensional linear transformation between world space and page space for
// the specified device context. This transformation can be used to scale, rotate,
// shear, or translate graphics output
XFORM xform;
xform.eM11 = T11;
xform.eM12 = T12;
xform.eM21 = T21;
xform.eM22 = T22;
xform.eDx =  T13;
xform.eDy =  T23;
SetWorldTransform( hDestDC, &xform );

// Now do the actual rotating
BitBlt(hDestDC,0,0,bm.bmWidth, bm.bmHeight, hSourceDC, 0, 0, SRCCOPY );

// Restore Origin.
bRet = OffsetWindowOrgEx(hSourceDC,OldSourceOrg.x, OldSourceOrg.y, NULL);

// Restore DCs
::SelectObject( hSourceDC, hbmOldSource );
::SelectObject( hDestDC, hbmOldDest );

pcbmRotated = new CBitmap();
pcbmRotated->Attach(hbmResult);

SetCursor(OldCursor);

return S_OK;

Aseem Sharma wrote:

We know that Windows "Open With" dialog box shows a complete list of installed applications that can open a file of some format. I want the same list of applications.

john5632 wrote:

Is subclass and drived class are same?

CDatabase dbStar;	
	CString strConnection = _T("Driver={Microsoft Access Driver (*.mdb)};Dbq=D:\\Sample.MDB;Uid=;Pwd=;");
	if ( dbStar.Open(_T(""),false,true,strConnection,true))
	{
// Do Something()..
}

Failure is Success If we learn from it!!