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UIColor-HSVAdditions.h
Objective-C
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//
// UIColor-HSVAdditions.h
//
// Created by Matt Reagan (bravobug.com) on 12/31/09.
//
//
 
// Copyright 2010 Fabián Cañas. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL FABIAN CANAS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
#import <UIKit/UIKit.h>
 
#import "UIColor-Expanded.h"
// get it here:
// http://github.com/ars/uicolor-utilities
 
#define MIN3(x,y,z) ((y) <= (z) ? \
((x) <= (y) ? (x) : (y)) \
: \
((x) <= (z) ? (x) : (z)))
 
#define MAX3(x,y,z) ((y) >= (z) ? \
((x) >= (y) ? (x) : (y)) \
: \
((x) >= (z) ? (x) : (z)))
 
 
struct rgb_color {
CGFloat r, g, b;
};
 
struct hsv_color {
CGFloat hue;
CGFloat sat;
CGFloat val;
};
 
@interface UIColor (UIColor_HSVAdditions)
 
@property (nonatomic, readonly) CGFloat hue; // Only valid if canProvideRGBComponents is YES
@property (nonatomic, readonly) CGFloat saturation; // Only valid if canProvideRGBComponents is YES
@property (nonatomic, readonly) CGFloat brightness; // Only valid if canProvideRGBComponents is YES
@property (nonatomic, readonly) CGFloat value; // (same as brightness, added for naming consistency)
 
 
//workhorse method, does conversion:
+(struct hsv_color)HSVfromRGB:(struct rgb_color)rgb;
//individual value accessors:
-(CGFloat)hue;
-(CGFloat)saturation;
-(CGFloat)brightness;
-(CGFloat)value;
@end
UIColor-HSVAdditions.m
Objective-C
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//
// UIColor-HSVAdditions.m
//
// Created by Matt Reagan (bravobug.com) on 12/31/09.
//
// Released into the public domain
// Original code: http://en.literateprograms.org/RGB_to_HSV_color_space_conversion_%28C%29
 
// Copyright 2010 Fabián Cañas. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL FABIAN CANAS BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 
#import "UIColor-HSVAdditions.h"
 
@implementation UIColor (UIColor_HSVAdditions)
+(struct hsv_color)HSVfromRGB:(struct rgb_color)rgb
{
struct hsv_color hsv;
 
CGFloat rgb_min, rgb_max;
rgb_min = MIN3(rgb.r, rgb.g, rgb.b);
rgb_max = MAX3(rgb.r, rgb.g, rgb.b);
 
hsv.val = rgb_max;
if (hsv.val == 0) {
hsv.hue = hsv.sat = 0;
return hsv;
}
 
rgb.r /= hsv.val;
rgb.g /= hsv.val;
rgb.b /= hsv.val;
rgb_min = MIN3(rgb.r, rgb.g, rgb.b);
rgb_max = MAX3(rgb.r, rgb.g, rgb.b);
 
hsv.sat = rgb_max - rgb_min;
if (hsv.sat == 0) {
hsv.hue = 0;
return hsv;
}
 
if (rgb_max == rgb.r) {
hsv.hue = 0.0 + 60.0*(rgb.g - rgb.b);
if (hsv.hue < 0.0) {
hsv.hue += 360.0;
}
} else if (rgb_max == rgb.g) {
hsv.hue = 120.0 + 60.0*(rgb.b - rgb.r);
} else /* rgb_max == rgb.b */ {
hsv.hue = 240.0 + 60.0*(rgb.r - rgb.g);
}
 
return hsv;
}
-(CGFloat)hue
{
struct hsv_color hsv;
struct rgb_color rgb;
rgb.r = [self red];
rgb.g = [self green];
rgb.b = [self blue];
hsv = [UIColor HSVfromRGB: rgb];
return (hsv.hue / 360.0);
}
-(CGFloat)saturation
{
struct hsv_color hsv;
struct rgb_color rgb;
rgb.r = [self red];
rgb.g = [self green];
rgb.b = [self blue];
hsv = [UIColor HSVfromRGB: rgb];
return hsv.sat;
}
-(CGFloat)brightness
{
struct hsv_color hsv;
struct rgb_color rgb;
rgb.r = [self red];
rgb.g = [self green];
rgb.b = [self blue];
hsv = [UIColor HSVfromRGB: rgb];
return hsv.val;
}
-(CGFloat)value
{
return [self brightness];
}
@end

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