L_ShearBitmap

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#include "l_bitmap.h"

L_LTKRN_API L_INT L_ShearBitmap(pBitmap, nAngle, fHorizontal, crFill)

pBITMAPHANDLE pBitmap;	/* pointer to the bitmap handle */
L_INT nAngle;	/* angle of slant */
L_BOOL fHorizontal;	/* TRUE for horizontal, FALSE for vertical */
L_COLORREF crFill;	/* COLORREF value for the fill color */

Moves the corners of a bitmap in the fashion of a parallelogram.

Parameter	Description
pBitmap	Pointer to the bitmap handle referencing the bitmap to shear.
nAngle	The angle of slant. Positive values are for clockwise angles; negative values are for counterclockwise angles. The angle is expressed in hundredths of degrees, with a limit of 4500 (45 degrees).
fHorizontal	TRUE for horizontal shear, or FALSE for vertical shear.
crFill	The COLORREF value that specifies the fill color. You can specify a COLORREF value, such as the return value of the Windows RGB macro, or you can use the PALETTEINDEX macro to specify a palette color.

Returns

SUCCESS	The function was successful.
< 1	An error occurred. Refer to Return Codes.

Comments

This function does not support signed data images. It returns the error code ERROR_SIGNED_DATA_NOT_SUPPORTED if a signed data image is passed to this function.

You specify an angle of slant, horizontal or vertical shear, and the fill color for the created space.

For an example, click here

The angle is expressed in hundredths of degrees, with a limit of 4500 (45 degrees).

To update a status bar or detect a user interrupt during execution of this function, refer to L_SetStatusCallback.

Required DLLs and Libraries

LTKRN

For a listing of the exact DLLs and Libraries needed, based on the toolkit version, refer to Files To Be Included With Your Application.

Platforms

Win32, x64, Linux.

See Also

Functions:	L_RotateBitmap, L_FlipBitmap, L_ReverseBitmap, L_DlgShear
Topics:	Raster Image Functions: Doing Geometric Transformations
	Resizing Considerations
	Using Color Values in LEADTOOLS

Example

For complete sample code, refer to the CHILD.C module of the DEMO example.

#define MAKE_IMAGE_PATH(pFileName) TEXT("C:\\Users\\Public\\Documents\\LEADTOOLS Images\\")pFileName


 L_INT ShearBitmapExample(L_VOID)
{
   L_INT nRet;
   BITMAPHANDLE LeadBitmap;   /* Bitmap handle to hold the loaded image. */

   /* Load the bitmap, keeping the bits per pixel of the file */
   nRet = L_LoadBitmap (MAKE_IMAGE_PATH(TEXT("IMAGE1.CMP")), &LeadBitmap, sizeof(BITMAPHANDLE), 0, ORDER_BGR, NULL, NULL);
   if(nRet != SUCCESS)
      return nRet;
   /* Shear the bitmap 15 degrees vertically, filling extra space with blue */
   nRet = L_ShearBitmap(&LeadBitmap, -1500, FALSE, RGB(0, 0, 255) );
   if(nRet != SUCCESS)
      return nRet;

   nRet = L_SaveBitmap(MAKE_IMAGE_PATH(TEXT("Result.BMP")), &LeadBitmap, FILE_BMP, 24, 0, NULL);
   if(nRet != SUCCESS)
      return nRet;
   if(LeadBitmap.Flags.Allocated)
      L_FreeBitmap(&LeadBitmap); 

   return SUCCESS;
}