d9bfd5a425
SimGear change. It changes all the SG_xxxx to be the 'real' includes, and gets rid of many #ifdef SG_HAVE_STD_INCLUDES. As an added bonus, rather than replacing 'SG_USING_NAMESPACE(std)' with 'using namespace std', I just fixed the small number of places to use std:: explicitly. So we're no longer polluting the global namespace with the entire contents of std, in many cases. There is one more 'mechanical' change to come - getting rid of SG_USING_STD(X), but I want to keep that separate from everything else. (There's another mechnical change, replacing <math.h> with <cmath> and so on *everywhere*, but one step at a time)
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
/*
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* sunsolver.hxx - given a location on earth and a time of day/date,
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* find the number of seconds to various sun positions.
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*
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* Written by Curtis Olson, started September 2003.
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*
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* Copyright (C) 2003 Curtis L. Olson - http://www.flightgear.org/~curt
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*
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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 as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $Id$
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*/
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#ifndef _SUNSOLVER_HXX
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#define _SUNSOLVER_HXX
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#ifndef __cplusplus
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# error This library requires C++
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#endif
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#include <simgear/compiler.h>
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#include <ctime>
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/**
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* Given the current unix time in seconds, calculate seconds to the
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* specified sun angle (relative to straight up.) Also specify if we
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* want the angle while the sun is ascending or descending. For
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* instance noon is when the sun angle is 0 (or the closest it can
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* get.) Dusk is when the sun angle is 90 and descending. Dawn is
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* when the sun angle is 90 and ascending.
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*/
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time_t fgTimeSecondsUntilSunAngle( time_t cur_time,
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double lon_rad,
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double lat_rad,
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double target_angle_deg,
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bool ascending );
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/**
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* given a particular time expressed in side real time at prime
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* meridian (GST), compute position on the earth (lat, lon) such that
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* sun is directly overhead. (lat, lon are reported in radians
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*/
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void fgSunPositionGST(double gst, double *lon, double *lat);
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#endif /* _SUNSOLVER_HXX */
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