ftp.nice.ch/pub/next/tools/screen/ScreenSaver.NIHS.bs.tar.gz#/ScreenSaver/Source/BouncingView.h

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#import <appkit/appkit.h>

#define	DELTA	5
@interface BouncingView:View
{
	id		myWindow;
	id		slidingImage;
	id		slidingImageRep;
	id		background;
	NXSize	imageSize;
	NXPoint	currentPoint;
	NXRect	previousRect;
	int		xDelta;
	int		yDelta;
}

-	startScreenSaver;
-	stopScreenSaver;
-	step;
@end

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