ftp.nice.ch/pub/next/tools/screen/backspace/GrayAquarium.NIHS.bs.tar.gz#/GrayAquarium/RotImage.h

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/*  
 * 
 * MyImage.h	-- How to rotate an NXImage
 * 
 * You may freely copy, distribute, and reuse the code in this example.
 * NeXT disclaims any warranty of any kind, expressed or  implied, as to its
 * fitness for any particular use.
 *
 * Written by Henry Krempel -- NeXT Developer Support
 *
 * Wed Apr 10 17:39:50 1991
 *
 * Modified by Brian Glaeske -- glaeske@plains.NoDak.edu
 *
 * Sat Mar 14 21:06:04 1992
 *
 * I put in more functionality so the range of rotations can be from 0 to 360.
 * The flip: method will flip vertically or horizontally.  Only handles square images nicely.
 *
 */
#import <appkit/NXImage.h>

#define HORIZONTAL 0
#define VERTICAL 1

@interface RotImage:NXImage
{
    int rotation, flipped, flippedHor, flippedVer;
    NXSize origSize, rotSize, *currentSize;
}

- initFromFile:(const char *)fileName;

- setRotation:(int)anInt;

- (BOOL)drawRepresentation:(NXImageRep *)imageRep inRect:(const NXRect *)rect;

- flip:(int)whichWay;

@end

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.