Colors.h

00001 /*  
00002       This file is part of Smoothie (http://smoothieware.org/). The motion control part is heavily based on Grbl (https://github.com/simen/grbl).
00003       Smoothie is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.
00004       Smoothie is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
00005       You should have received a copy of the GNU General Public License along with Smoothie. If not, see <http://www.gnu.org/licenses/>. 
00006 */
00007 #ifndef COLORS_H
00008 #define COLORS_H
00009 
00010 void HSVtoRGB( float *r, float *g, float *b, float h, float s, float v )
00011 {
00012     int i;
00013     float f, p, q, t;
00014     if( s == 0 ) {
00015         // achromatic (grey)
00016         *r = *g = *b = v;
00017         return;
00018     }
00019     h /= 60.0;          // sector 0 to 5
00020     i = floor( h );
00021     f = h - i;          // factorial part of h
00022     p = v * ( 1.0 - s );
00023     q = v * ( 1.0 - s * f );
00024     t = v * ( 1.0 - s * ( 1.0 - f ) );
00025     switch( i ) {
00026         case 0:
00027             *r = v;
00028             *g = t;
00029             *b = p;
00030             break;
00031         case 1:
00032             *r = q;
00033             *g = v;
00034             *b = p;
00035             break;
00036         case 2:
00037             *r = p;
00038             *g = v;
00039             *b = t;
00040             break;
00041         case 3:
00042             *r = p;
00043             *g = q;
00044             *b = v;
00045             break;
00046         case 4:
00047             *r = t;
00048             *g = p;
00049             *b = v;
00050             break;
00051         default:        // case 5:
00052             *r = v;
00053             *g = p;
00054             *b = q;
00055             break;
00056     }
00057 }
00058 
00059 #endif // COLORS_H
00060