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