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LBitmap::HighQualityRotate

#include "ltwrappr.h"

L_INT LBitmap::HighQualityRotate(nAngle, uFlags, crFill)

L_INT nAngle;	rotation degrees
L_UINT uFlags;	rotation behavior
L_COLORREF crFill;	background fill color

Rotates 1-bit (bitonal) images with high quality.

Parameter	Description
nAngle	Hundredths of degrees to rotate (+/-). This can be a number from 0 to 36,000. Positive values rotate the image in a clockwise direction, while negative values rotate the image in a counter-clockwise direction.
uFlags	Flag that specifies whether to keep the resulting image the same size as the original image or to resize according to the rotation direction specified. Possible values are:
	Value	Meaning
	ROTATE_RESIZE	[0x0001] Size the resulting image.
	HIGHQUALITYROTATE_HIGH	[0x0000] Rotate the image with high quality.(this is faster than best quality)
	HIGHQUALITYROTATE_BEST	[0x0010] Rotate the image the image with the best quality.
	HIGHQUALITYROTATE_CROP	[0x0000] Do not resize the image. Crop it.
	HIGHQUALITYROTATE_RESIZE	[0x0001] Use high qualiity resize.
crFill	A COLORREF value representing the color of the backgrounds. You can specify the value, such as the return value of the Windows RGB macro, or 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 has the following features:

It works only with 1-bit images.
It uses the center of the image as the center of rotation.
It can rotate the image clockwise or counterclockwise up to 360 degrees in 1-degree increments.
It can resize the image to accommodate the rotated height and width, or it can retain the original height and width, cropping the bitmap as necessary.
It uses crFill as the background color to fill any new area created by the rotation.

If ROTATE_RESIZE is set, then the image is resized. Otherwise, the image is cropped.

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

Required DLLs and Libraries

LTIMGEFX

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.

Example

L_INT LBitmap__HighQualityRotateBitmapExample(LBitmap & LeadBitmap) 
{ 
   L_INT nRet; 
 
   /* Load the bitmap, keeping the bits per pixel of the file */ 
   nRet = LeadBitmap.Load(TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\OCR1.TIF")); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet = LeadBitmap.HighQualityRotate(2500, HIGHQUALITYROTATE_RESIZE | HIGHQUALITYROTATE_HIGH,RGB(255,255,255)); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   nRet = LeadBitmap.Save(TEXT("%UserProfile%\\My Documents\\LEADTOOLS Images\\Result.BMP"), FILE_BMP, 24, 0, NULL); 
   if(nRet !=SUCCESS) 
      return nRet; 
 
   return SUCCESS; 
}

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Help Version 20.0.2020.4.5

LEADTOOLS Raster Imaging C++ Class Library Help

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Summary of Features

Functions:	LBitmapBase::Rotate, LBitmapBase::RotateViewPerspective
Topics:	Raster Image Functions: Doing Geometric Transformations
	Raster Image Functions: Functions That Transform the Region and the Bitmap
	Raster Image Functions: Processing an Image