90 lines
2.5 KiB
C
90 lines
2.5 KiB
C
/**************************************************************************
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* constants.h -- various constant definitions
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*
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* Written by Curtis Olson, started July 1997.
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*
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* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#ifndef CONSTANTS_H
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#define CONSTANTS_H
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#include <math.h>
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/* Make sure PI is defined in its various forms */
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#ifdef M_PI
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# define FG_PI M_PI
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#else
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# define FG_PI 3.14159265358979323846 /* pi */
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#endif
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#ifdef M_PI_2
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# define FG_PI_2 M_PI_2
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#else
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# define FG_PI_2 1.57079632679489661923 /* pi/2 */
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#endif
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#define FG_2PI (FG_PI + FG_PI) /* 2*pi */
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/* Radius of Earth in kilometers at the equator. Another source had
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* 6378.165 but this is probably close enough */
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#define EARTH_RAD 6378.155
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/* Degrees to Radians */
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#define DEG_TO_RAD 0.017453292 /* deg*pi/180 = rad */
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/* Radians to Degrees */
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#define RAD_TO_DEG 57.29577951 /* rad*180/pi = deg */
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/* Arc seconds to radians */ /* (arcsec*pi)/(3600*180) = rad */
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#define ARCSEC_TO_RAD 4.84813681109535993589e-06
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/* Feet to Meters */
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#define FEET_TO_METER 0.3048
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/* Meters to Feet */
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#define METER_TO_FEET 3.28083989501312335958
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/* For divide by zero avoidance, this will be close enough to zero */
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#define EPSILON 0.000001
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#endif CONSTANTS_H
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/* $Log$
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/* Revision 1.4 1997/07/19 22:37:03 curt
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/* Added various PI definitions.
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/*
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* Revision 1.3 1997/07/14 16:26:03 curt
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* Testing/playing -- placed objects randomly across the entire terrain.
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*
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* Revision 1.2 1997/07/08 18:20:11 curt
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* Working on establishing a hard ground.
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*
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* Revision 1.1 1997/07/07 21:02:36 curt
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* Initial revision.
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* */
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