/usr/include/grits/grits-util.h is in libgrits-dev 0.8.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2009-2011 Andy Spencer <andy753421@gmail.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 3 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, see <http://www.gnu.org/licenses/>.
*/
#ifndef __GRITS_UTIL_H__
#define __GRITS_UTIL_H__
#include <glib.h>
/**
* EARTH_R:
*
* Radius of the earth
*/
#define EARTH_R (6371000)
/**
* EARTH_C:
*
* Circumference of the earth at the equator
*/
#define EARTH_C (2*G_PI*EARTH_R)
/**
* NORTH:
*
* Latitude at the north poll
*/
#define NORTH 90
/**
* SOUTH:
*
* Latitude at the south poll
*/
#define SOUTH -90
/**
* EAST:
*
* Eastern most longitude
*/
#define EAST 180
/**
* WEST:
*
* Western most longitude
*/
#define WEST -180
/***************
* Conversions *
***************/
/**
* azim2lon:
* @azim: the azimuth in radians
*
* Convert azimuth to longitude
*
* Returns: the longitude
*/
#define azim2lon(azim) ((azim)*180/G_PI)
/**
* lon2azim:
* @lon: the longitude
*
* Convert longitude to azimuth
*
* Returns: the azimuth in radians
*/
#define lon2azim(lon) ((lon)*G_PI/180)
/**
* incl2lat:
* @incl: the inclination in radians
*
* Convert inclination to latitude
*
* Returns: the latitude
*/
#define incl2lat(incl) (90-(incl)*180/G_PI)
/**
* lat2incl:
* @lat: the latitude
*
* Convert latitude to inclination
*
* Returns: the inclination in radians
*/
#define lat2incl(lat) ((90-(lat))*G_PI/180)
/**
* rad2elev:
* @rad: the radius in meters
*
* Convert radius to elevation
*
* Returns: the elevation in meters above the earth surface
*/
#define rad2elev(rad) ((rad)-EARTH_R)
/**
* elev2rad:
* @elev: the elevation in meters above the earth surface
*
* Convert elevation to radius
*
* Returns: the radius in meters
*/
#define elev2rad(elev) ((elev)+EARTH_R)
/**
* deg2rad:
* @deg: the angle in degrees
*
* Convert degrees to radians
*
* Returns: the angle in radians
*/
#define deg2rad(deg) (((deg)*G_PI)/180.0)
/**
* rad2deg:
* @rad: the angle in radians
*
* Convert radians to degrees
*
* Returns: the angle in degrees
*/
#define rad2deg(rad) (((rad)*180.0)/G_PI)
/*************
* Datatypes *
*************/
/* GritsPoint */
typedef struct _GritsPoint GritsPoint;
struct _GritsPoint {
gdouble lat, lon, elev;
};
void grits_point_set_lle(GritsPoint *point,
gdouble lat, gdouble lon, gdouble elev);
/* GritsPoints */
typedef gdouble (*GritsPoints)[3];
/* GritsBounds */
typedef struct _GritsBounds GritsBounds;
struct _GritsBounds {
gdouble n, s, e, w;
};
void grits_bounds_set_bounds(GritsBounds *bounds,
gdouble n, gdouble s, gdouble e, gdouble w);
/********
* Misc *
********/
/**
* FOV_DIST:
*
* Used by GritsOpenGL to set up the drawing window
*/
#define FOV_DIST (1039.23)
/**
* MPPX:
* @dist: the distance between the eye and the point in question
*
* Get the resolution that a point would be drawn at on the screen
*
* Returns: the resolution in meters per pixel
*/
#define MPPX(dist) (dist/FOV_DIST)
void lle2xyz(gdouble lat, gdouble lon, gdouble elev,
gdouble *x, gdouble *y, gdouble *z);
void xyz2lle(gdouble x, gdouble y, gdouble z,
gdouble *lat, gdouble *lon, gdouble *elev);
void xyz2ll(gdouble x, gdouble y, gdouble z,
gdouble *lat, gdouble *lon);
gdouble ll2m(gdouble lon_dist, gdouble lat);
gdouble distd(gdouble *a, gdouble *b);
void crossd(gdouble *a, gdouble *b, gdouble *out);
void crossd3(gdouble *a, gdouble *b, gdouble *c, gdouble *out);
gdouble lengthd(gdouble *a);
void normd(gdouble *a);
gdouble lon_avg(gdouble a, gdouble b);
GritsPoints *parse_points(const gchar *string,
const gchar *group_sep, const gchar *point_sep, const gchar *coord_sep,
GritsBounds *bounds, GritsPoint *center);
void free_points(GritsPoints *points);
#endif
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