[4744] | 1 | /* |
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[1853] | 2 | orxonox - the future of 3D-vertical-scrollers |
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| 3 | |
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| 4 | Copyright (C) 2004 orx |
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| 5 | |
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| 6 | This program is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 2, or (at your option) |
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| 9 | any later version. |
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[1855] | 10 | |
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| 11 | ### File Specific: |
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[5009] | 12 | main-programmer: Benjamin Grauer |
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[1855] | 13 | co-programmer: ... |
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[1853] | 14 | */ |
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| 15 | |
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[3955] | 16 | //#define DEBUG_SPECIAL_MODULE DEBUG_MODULE_ |
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[1853] | 17 | |
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[5009] | 18 | #include "color.h" |
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[5010] | 19 | #include "vector.h" |
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[1853] | 20 | |
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[1856] | 21 | using namespace std; |
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[1853] | 22 | |
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[5010] | 23 | |
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| 24 | |
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| 25 | |
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| 26 | #include <stdio.h> |
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| 27 | |
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[5011] | 28 | /** |
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| 29 | * transforms from RGB to HSVtoRGB |
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| 30 | * @param RGB the RGB-color [0-1] |
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| 31 | * @returns HSV: with values (h[0-360(degree)],s[0,1],v[0,1]) |
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| 32 | */ |
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[5010] | 33 | Vector Color::RGBtoHSV(const Vector& RGB) |
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| 34 | { |
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| 35 | float r = RGB.x; |
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| 36 | float g = RGB.y; |
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| 37 | float b = RGB.z; |
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| 38 | |
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| 39 | float h=0,s=1.0,v=1.0; |
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| 40 | float max_v,min_v,diff,r_dist,g_dist,b_dist; |
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| 41 | float undefined = 0.0; |
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| 42 | |
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| 43 | max_v = maxrgb(r,g,b); |
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| 44 | min_v = minrgb(r,g,b); |
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| 45 | diff = max_v - min_v; |
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| 46 | v = max_v; |
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| 47 | |
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| 48 | if( max_v != 0 ) |
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| 49 | s = diff/max_v; |
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| 50 | else |
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| 51 | s = 0.0; |
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| 52 | if( s == 0 ) |
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| 53 | h = undefined; |
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| 54 | else { |
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| 55 | r_dist = (max_v - r)/diff; |
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| 56 | g_dist = (max_v - g)/diff; |
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| 57 | b_dist = (max_v - b)/diff; |
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| 58 | if( r == max_v ) |
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| 59 | h = b_dist - g_dist; |
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| 60 | else |
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| 61 | if( g == max_v ) |
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| 62 | h = 2 + r_dist - b_dist; |
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| 63 | else |
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| 64 | if( b == max_v ) |
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| 65 | h = 4 + g_dist - r_dist; |
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| 66 | else |
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| 67 | printf("rgb2hsv::How did I get here?\n"); |
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[5011] | 68 | h *= 60.; |
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[5010] | 69 | if( h < 0) |
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| 70 | h += 360.0; |
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[5009] | 71 | } |
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[5010] | 72 | return Vector(h, s, v); |
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[3365] | 73 | } |
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[1853] | 74 | |
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[5011] | 75 | /** |
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| 76 | * converts a Color from HSV to RGBtoHSV |
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| 77 | * @param HSV: Vector with values (h[0-360(degree)],s[0,1],v[0,1]) |
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| 78 | * @returns RGB: Vector [0-1] |
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| 79 | */ |
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[5010] | 80 | Vector Color::HSVtoRGB(const Vector& HSV) |
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[3543] | 81 | { |
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[5010] | 82 | float h = HSV.x; |
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| 83 | float s = HSV.y; |
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| 84 | float v = HSV.z; |
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| 85 | float r=0, g=0, b=0; |
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| 86 | float f,p,q,t; |
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| 87 | int i; |
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[5009] | 88 | |
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[5010] | 89 | if( s == 0 ) { |
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| 90 | r = v; |
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| 91 | g = v; |
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| 92 | b = v; |
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| 93 | } |
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| 94 | else { |
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| 95 | if(h == 360.) |
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| 96 | h = 0.0; |
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| 97 | h /= 60.; |
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| 98 | i = (int) h; |
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| 99 | f = h - i; |
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| 100 | p = v*(1-s); |
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| 101 | q = v*(1-(s*f)); |
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| 102 | t = v*(1-s*(1-f)); |
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| 103 | switch(i) { |
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| 104 | case 0: |
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| 105 | r = v; |
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| 106 | g = t; |
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| 107 | b = p; |
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| 108 | break; |
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| 109 | case 1: |
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| 110 | r = q; |
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| 111 | g = v; |
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| 112 | b = p; |
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| 113 | break; |
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| 114 | case 2: |
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| 115 | r = p; |
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| 116 | g = v; |
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| 117 | b = t; |
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| 118 | break; |
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| 119 | case 3: |
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| 120 | r = p; |
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| 121 | g = q; |
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| 122 | b = v; |
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| 123 | break; |
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| 124 | case 4: |
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| 125 | r = t; |
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| 126 | g = p; |
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| 127 | b = v; |
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| 128 | break; |
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| 129 | case 5: |
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| 130 | r = v; |
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| 131 | g = p; |
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| 132 | b = q; |
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| 133 | break; |
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| 134 | default: |
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| 135 | r = 1.0; |
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| 136 | g = 1.0; |
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| 137 | b = 1.0; |
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| 138 | //printf("hsv2rgb::How did I get here?\n"); |
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| 139 | // printf("h: %f, s: %f, v: %f; i: %d\n",hin,s,v,i); |
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| 140 | break; |
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| 141 | } |
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| 142 | } |
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| 143 | return Vector(r,g,b); |
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[3543] | 144 | } |
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[5011] | 145 | |
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| 146 | |
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| 147 | // Needed by rgb2hsv() |
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| 148 | float Color::maxrgb(float r, float g, float b) |
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| 149 | { |
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| 150 | float max; |
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| 151 | if( r > g) |
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| 152 | max = r; |
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| 153 | else |
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| 154 | max = g; |
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| 155 | if( b > max ) |
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| 156 | max = b; |
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| 157 | return( max ); |
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| 158 | } |
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| 159 | |
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| 160 | |
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| 161 | // Needed by rgb2hsv() |
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| 162 | float Color::minrgb(float r,float g,float b) |
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| 163 | { |
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| 164 | float min; |
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| 165 | |
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| 166 | if( r < g) |
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| 167 | min = r; |
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| 168 | else |
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| 169 | min = g; |
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| 170 | if( b < min ) |
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| 171 | min = b; |
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| 172 | return( min ); |
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| 173 | } |
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| 174 | |
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