hsla.h

00001 /***************************************************************************
00002 *   Copyright (C) 2006 by Rick L. Vinyard, Jr.                            *
00003 *   rvinyard@cs.nmsu.edu                                                  *
00004 *                                                                         *
00005 *   This program is free software; you can redistribute it and/or modify  *
00006 *   it under the terms of the GNU Lesser General Public License as        *
00007 *   published by the Free Software Foundation version 2.1.                *
00008 *                                                                         *
00009 *   This program is distributed in the hope that it will be useful,       *
00010 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
00011 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
00012 *   GNU General Public License for more details.                          *
00013 *                                                                         *
00014 *   You should have received a copy of the GNU Lesser General Public      *
00015 *   License along with this library; if not, write to the                 *
00016 *   Free Software Foundation, Inc.,                                       *
00017 *   51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA              *
00018 ***************************************************************************/
00019 #ifndef PAPYRUSHSLA_H
00020 #define PAPYRUSHSLA_H
00021 
00022 namespace Papyrus
00023   {
00024 
00025   struct RGBA;
00026 
00030   struct HSLA
00031     {
00032       HSLA(double h=0.0, double s=0.0, double l=0.0, double a=0.0);
00033 
00034       HSLA(const RGBA& rgb);
00035 
00036       double hue, saturation, lightness, alpha;
00037 
00038       double operator[](unsigned index);
00039 
00040       HSLA& operator=(const RGBA& rgb);
00041 
00042       operator RGBA();
00043 
00044     };
00045 
00050     void rgb_to_hsl(double rgb_r, double rgb_g, double rgb_b,
00051                   double& h, double& s, double& l);
00052 
00057     void hsl_to_rgb(double hsl_h, double hsl_s, double hsl_l,
00058                     double& rgb_r, double& rgb_g, double& rgb_b);
00059 
00060 }
00061 
00062 #endif

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