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* Copyright (C) 2003 Fabien Chereau
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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// month : 1=Jan, 12=Dec
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// moon_phase in radian 0=Full Moon, PI/2=First Quadrant/Last Quadran, PI=No Moon
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void set_date(int year, int month, float moon_phase);
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// Set the position parameters
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// Latitude in radian, altitude in m, temperature in deg. C, humidity in %
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void set_loc(float latitude, float altitude, float temperature = 15.f,
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float relative_humidity = 40.f);
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// Set the moon and sun zenith angular distance (cosin given) and precompute what can be
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// This funtion has to be called once before any call to get_luminance()
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// Input : cos_dist_moon_zenith = cos(angular distance between moon and zenith)
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// cos_dist_sun_zenith = cos(angular distance between sun and zenith)
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void set_sun_moon(float cos_dist_moon_zenith, float cos_dist_sun_zenith);
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// Compute the luminance at the given position
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// Inputs : cos_dist_moon = cos(angular distance between moon and the position)
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// cos_dist_sun = cos(angular distance between sun and the position)
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// cos_dist_zenith = cos(angular distance between zenith and the position)
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float get_luminance(float cos_dist_moon, float cos_dist_sun, float cos_dist_zenith);
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float air_mass_moon; // Air mass for the Moon
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float air_mass_sun; // Air mass for the Sun
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double b_total; // Total brightness
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float b_night; // Dark night brightness
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float b_twilight; // Twilight brightness
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float b_daylight; // Daylight sky brightness
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float b_moon; // Moon brightness
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float mag_moon; // Moon magnitude
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float RA; // Something related with date
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float K; // Useful coef...
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float C3; // Term for moon brightness computation
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float C4; // Term for sky brightness computation
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float SN; // Snellen Ratio (20/20=1.0, good 20/10=2.0)
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// Optimisation variables
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float b_twilight_term;
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#endif // _SKYBRIGHT_H_
added
removed
src/skybright.h
