constants.h

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// constants.h -- various constant definitions
//
// Written by Curtis Olson, started February 2000.
//
// Copyright (C) 2000  Curtis L. Olson - http://www.flightgear.org/~curt/
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
//
// $Id: constants_8h_source.html,v 1.3 2010/02/23 22:10:12 curt Exp $

#ifndef _SG_CONSTANTS_H
#define _SG_CONSTANTS_H


#include <simgear/compiler.h>

#include <cmath>


#include <plib/sg.h>


// Make sure PI is defined in its various forms

// SG_PI and SGD_PI (float and double) come from plib/sg.h

#define SGD_2PI      6.28318530717958647692

#ifdef M_PI_2
#  define  SGD_PI_2  M_PI_2
#else
#  define  SGD_PI_2  1.57079632679489661923
#endif

#define SGD_PI_4     0.78539816339744830961

#ifdef M_E
#  define SG_E     M_E
#else
#  define SG_E     2.7182818284590452354
#endif

#define SG_ONE_SECOND 4.848136811E-6


#define SG_EARTH_RAD 6378.155

// Maximum terrain elevation from sea level
#define SG_MAX_ELEVATION_M 9000.0

// Earth parameters for WGS 84, taken from LaRCsim/ls_constants.h

#define SG_EQUATORIAL_RADIUS_FT  20925650.

#define SG_EQUATORIAL_RADIUS_M   6378138.12

#define SG_EQ_RAD_SQUARE_FT 437882827922500.

#define SG_EQ_RAD_SQUARE_M   40680645877797.1344

// Conversions

#define SG_ARCSEC_TO_RAD    4.84813681109535993589e-06 

#define SG_RAD_TO_ARCSEC    206264.806247096355156

#define SG_FEET_TO_METER    0.3048

#define SG_METER_TO_FEET    3.28083989501312335958  

#define SG_METER_TO_NM      0.0005399568034557235

#define SG_NM_TO_METER      1852.0000

#define SG_METER_TO_SM      0.0006213699494949496

#define SG_SM_TO_METER      1609.3412196

#define SG_NM_TO_RAD        0.00029088820866572159

#define SG_RAD_TO_NM        3437.7467707849392526

#define SG_MPS_TO_KT        1.9438444924406046432

#define SG_KT_TO_MPS        0.5144444444444444444

#define SG_FPS_TO_KT        0.5924838012958962841

#define SG_KT_TO_FPS        1.6878098571011956874

#define SG_MPS_TO_MPH       2.2369362920544020312

#define SG_MPH_TO_MPS       0.44704

#define SG_MPS_TO_KMH       3.6

#define SG_KMH_TO_MPS       0.2777777777777777778

#define SG_PA_TO_INHG       0.0002952998330101010

#define SG_INHG_TO_PA       3386.388640341


#define SG_EPSILON 0.0000001

#define SG_BINOBJ_VERSION 6

#define SG_SCENERY_FILE_FORMAT "0.4"


#endif // _SG_CONSTANTS_H

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