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core/modules/Skybright.hpp

00001  /*
00002  * Copyright (C) 2003 Fabien Chereau
00003  *
00004  * This program is free software; you can redistribute it and/or
00005  * modify it under the terms of the GNU General Public License
00006  * as published by the Free Software Foundation; either version 2
00007  * of the License, or (at your option) any later version.
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 General Public License
00015  * along with this program; if not, write to the Free Software
00016  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
00017  */
00018 
00019 #ifndef _SKYBRIGHT_HPP_
00020 #define _SKYBRIGHT_HPP_
00021 
00025 class Skybright
00026 {
00027 public:
00029     Skybright();
00030 
00035     void setDate(int year, int month, float moonPhase);
00036 
00042     void setLocation(float latitude, float altitude, float temperature=15.f, float relativeHumidity=40.f);
00043 
00048     void setSunMoon(float cosDistMoonZenith, float cosDistSunZenith);
00049 
00054     float getLuminance(float cosDistMoon, float cosDistSun, float cosDistZenith) const;
00055 
00056 private:
00057     float airMassMoon;  // Air mass for the Moon
00058     float airMassSun;   // Air mass for the Sun
00059     float magMoon;      // Moon magnitude
00060     float RA;           // Something related with date
00061     float K;            // Useful coef...
00062     float C3;           // Term for moon brightness computation
00063     float C4;           // Term for sky brightness computation
00064     float SN;           // Snellen Ratio (20/20=1.0, good 20/10=2.0)
00065 
00066     // Optimisation variables
00067     float bNightTerm;
00068     float bMoonTerm1;
00069     float bTwilightTerm;
00070 };
00071 
00072 #endif // _SKYBRIGHT_HPP_