1997-07-08 05:02:36 +08:00
|
|
|
/**************************************************************************
|
|
|
|
|
* polar.h -- routines to deal with polar math and transformations
|
|
|
|
|
*
|
|
|
|
|
* Written by Curtis Olson, started June 1997.
|
|
|
|
|
*
|
|
|
|
|
* Copyright (C) 1997 Curtis L. Olson - curt@infoplane.com
|
|
|
|
|
*
|
|
|
|
|
* This program is free software; you can redistribute it and/or
|
|
|
|
|
* modify it under the terms of the GNU General Public License as
|
|
|
|
|
* published by the Free Software Foundation; either version 2 of the
|
|
|
|
|
* License, or (at your option) any later version.
|
|
|
|
|
*
|
|
|
|
|
* This program 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
|
|
|
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
|
*
|
|
|
|
|
* $Id$
|
|
|
|
|
* (Log is kept at end of this file)
|
|
|
|
|
**************************************************************************/
|
|
|
|
|
|
|
|
|
|
|
1998-01-22 10:59:38 +08:00
|
|
|
#ifndef _POLAR_H
|
|
|
|
|
#define _POLAR_H
|
1997-07-08 05:02:36 +08:00
|
|
|
|
|
|
|
|
|
1998-01-20 03:27:10 +08:00
|
|
|
#include <Include/types.h>
|
1997-07-08 05:02:36 +08:00
|
|
|
|
|
|
|
|
|
1997-08-01 06:52:27 +08:00
|
|
|
/* Convert a polar coordinate to a cartesian coordinate. Lon and Lat
|
|
|
|
|
* must be specified in radians. The FG convention is for distances
|
|
|
|
|
* to be specified in meters */
|
|
|
|
|
struct fgCartesianPoint fgPolarToCart(double lon, double lat, double radius);
|
|
|
|
|
|
1997-07-08 05:02:36 +08:00
|
|
|
|
|
|
|
|
/* Precalculate as much as possible so we can do a batch of transforms
|
|
|
|
|
* through the same angles, will rotates a cartesian point about the
|
|
|
|
|
* center of the earth by Theta (longitude axis) and Phi (latitude
|
|
|
|
|
* axis) */
|
|
|
|
|
|
|
|
|
|
/* Here are the unoptimized transformation equations
|
|
|
|
|
|
|
|
|
|
x' = cos(Phi) * cos(Theta) * x + cos(Phi) * sin(Theta) * y +
|
|
|
|
|
sin(Phi) * z
|
|
|
|
|
y' = -sin(Theta) * x + cos(Theta) * y
|
|
|
|
|
z' = -sin(Phi) * sin(Theta) * y - sin(Phi) * cos(Theta) * x +
|
|
|
|
|
cos(Phi) * z;
|
|
|
|
|
|
|
|
|
|
*/
|
|
|
|
|
void fgRotateBatchInit(double Theta, double Phi);
|
|
|
|
|
|
1997-08-01 06:52:27 +08:00
|
|
|
|
1997-07-08 05:02:36 +08:00
|
|
|
/* Rotates a cartesian point about the center of the earth by Theta
|
|
|
|
|
* (longitude axis) and Phi (latitude axis) */
|
|
|
|
|
struct fgCartesianPoint fgRotateCartesianPoint(struct fgCartesianPoint p);
|
|
|
|
|
|
|
|
|
|
|
1998-01-22 10:59:38 +08:00
|
|
|
#endif /* _POLAR_H */
|
1997-07-08 05:02:36 +08:00
|
|
|
|
|
|
|
|
|
|
|
|
|
/* $Log$
|
1998-01-22 10:59:38 +08:00
|
|
|
/* Revision 1.6 1998/01/22 02:59:39 curt
|
|
|
|
|
/* Changed #ifdef FILE_H to #ifdef _FILE_H
|
1997-07-08 05:02:36 +08:00
|
|
|
/*
|
1998-01-22 10:59:38 +08:00
|
|
|
* Revision 1.5 1998/01/19 19:27:13 curt
|
|
|
|
|
* Merged in make system changes from Bob Kuehne <rpk@sgi.com>
|
|
|
|
|
* This should simplify things tremendously.
|
|
|
|
|
*
|
1998-01-20 03:27:10 +08:00
|
|
|
* Revision 1.4 1997/12/15 23:54:55 curt
|
|
|
|
|
* Add xgl wrappers for debugging.
|
|
|
|
|
* Generate terrain normals on the fly.
|
|
|
|
|
*
|
1997-12-16 07:54:53 +08:00
|
|
|
* Revision 1.3 1997/07/31 22:52:28 curt
|
|
|
|
|
* Working on redoing internal coordinate systems & scenery transformations.
|
|
|
|
|
*
|
1997-08-01 06:52:27 +08:00
|
|
|
* Revision 1.2 1997/07/23 21:52:21 curt
|
|
|
|
|
* Put comments around the text after an #endif for increased portability.
|
|
|
|
|
*
|
1997-07-24 05:52:21 +08:00
|
|
|
* Revision 1.1 1997/07/07 21:02:37 curt
|
|
|
|
|
* Initial revision.
|
|
|
|
|
*
|
1997-07-08 05:02:36 +08:00
|
|
|
*/
|
