ftp.nice.ch/pub/next/tools/screen/backspace/_GrayAquarium.N.bs/GrayAquarium/DuoImage.m

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/*  
 * 
 * DuoImage.m	-- tracks image and horizonatally flipped image
 * 
 * Paul A. Griffin
 * 8/16/93
 */
#import "DuoImage.h"
#import "RotImage.h"

@implementation DuoImage

- duoInit
{
	reversed = NO;
	
	originalImage = [RotImage allocFromZone:[self zone]];
	flippedImage =  [RotImage allocFromZone:[self zone]];
	
	return self;
}
 
- initFromFile:(const char *)fileName
{
	[self duoInit];
	[originalImage initFromFile:fileName];
	[flippedImage  initFromFile:fileName];
	[flippedImage flip:HORIZONTAL];	
	return self;
}


- (id)theImage
{

	if(reversed) return flippedImage;
	else return originalImage;	
}

- flip:(int)whichWay;
{
	if(whichWay == HORIZONTAL)
	{
		if(reversed) reversed = NO;
		else reversed = YES;
	}
	if(whichWay == VERTICAL)
	{
		[[self theImage] flip:VERTICAL];
	}
	return self;
}

- getSize:(NXSize *)imageSize
{
	[[self theImage] getSize:imageSize];
	return self;
}

- composite:(int)op toPoint:(const NXPoint *)point
{
	return [[self theImage] composite:op toPoint:point];
}

- dissolve:(float)delta toPoint:(const NXPoint *)point;
{
	return [[self theImage] dissolve:delta toPoint:point];
}

@end

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