ftp.nice.ch/pub/next/developer/objc/gamekit/gamekit_future.s.tar.gz#/gamekit_future/gamekit-1/BonusTracker.m

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#import <gamekit/gamekit.h>
#import <ansi/math.h>

#define PUTINBOUNDS if (value < min) value = min; \
					if (value > max) value = max
					
@implementation BonusTracker

- init
{
	[super init];
	min = 0;
	increment = 0;
	multiplier = 1;
	baseValue = 0;
	max = MAXINT;
	[self resetBonus];
    return self;
}

- (int)bonusValue
{
	return value;
}

- setBaseValue:(int)newValue
{
	baseValue = newValue;
	return self;
}

- setMultiplier:(int)newMultiplier
{
	multiplier = newMultiplier;
	return self;
}

- setIncrement:(int)newIncrement
{
	increment = newIncrement;
	return self;
}

- setMin:(int)newMin max:(int)newMax
{
	min = newMin; max = newMax;
	PUTINBOUNDS;
	return self;
}

- resetBonus
{
	value = baseValue;
	return self;
}

- advanceBonus // move to the next bonus value.
{
	value *= multiplier;
	value += increment;
	PUTINBOUNDS;
	return self;
}

- retreatBonus // inverse of above method.
{
	value -= increment;
	// avoid divide by zero...
	if (multiplier) value /= multiplier;
	PUTINBOUNDS;
	return self;
}


@end

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