//
//  NSArrayAdditions.m
//  Exercise 20
//
//  Created by Jonathan Saggau on 9/19/06.
//  Copyright 2006 Jonathan Saggau. All rights reserved.
//

#import "NSArrayAdditions.h"

@implementation NSArray (NSArrayAdditions)

- (NSArray *)normalizedArrayToMin:(float) min
                            toMax:(float) max;
{
    int len = [self count];
    float minValue, maxValue, range, outRange;
    if (len <= 0)
        return [NSArray array];

    NSArray *sortedArray;
    sortedArray = [self sortedArrayUsingSelector:@selector(compare:)];
    minValue = [[sortedArray objectAtIndex:0] floatValue];
    maxValue = [[sortedArray lastObject] floatValue];
    range = maxValue - minValue;
    outRange = max - min;
    
    NSMutableArray *normalArray = [[NSMutableArray alloc] initWithCapacity:len];
    for (int i = 0; i < len; i++)
    {
        float eachNewValue = [[self objectAtIndex:i] floatValue];
        
        //normalize zero .. range
        eachNewValue -= minValue;
        
        //normalize zero .. one
        eachNewValue /= range;
        
        //normalize zero .. outRange
        eachNewValue *= outRange;
        
        //shift whole mess to make lowest value correspond to min
        eachNewValue += min;
        
        [normalArray addObject:[NSNumber numberWithFloat:eachNewValue]];
    }
    
    NSArray *outArray = [NSArray arrayWithArray:normalArray];
    [normalArray release];
    return outArray;
}

- (id)min
{  
    NSArray *sortedArray;
    sortedArray = [self sortedArrayUsingSelector:@selector(compare:)];
    return [sortedArray objectAtIndex:0];
}

- (id)max
{
    NSArray *sortedArray;
    sortedArray = [self sortedArrayUsingSelector:@selector(compare:)];
    return [sortedArray lastObject];
}

@end