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/****************************************************************************
Xplanet 0.94 - render an image of a planet into an X window
Copyright (C) 2002 Hari Nair <hari@alumni.caltech.edu>
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
****************************************************************************/
#ifndef UTIL_H
#define UTIL_H
#include <cmath>
#include <ctime>
#include <string>
using namespace std;
#include "checkfuncs.h"
#ifndef M_PI
#define M_PI 3.14159265358979323846 /* pi */
#define M_PI_2 1.57079632679489661923 /* pi/2 */
#endif
const double deg_to_rad = M_PI/180.;
const double TWO_PI = 2 * M_PI;
#ifndef HAVE_DREM
extern double drem (const double x, const double y);
#endif /* !HAVE_DREM */
extern void removeFromEnvironment(const char *name);
extern double kepler(const double e, const double M);
extern double poly(const double a1, const double a2, const double a3,
const double a4, const double t);
extern double julian(int year, int month, int day, int hour, int min,
int sec);
extern double julianCentury(const time_t tv_sec);
extern double calcObliquity(const double T);
extern void eclipticToEquatorial(const double ec_lon, const double ec_lat,
const double eps,
double &eq_lon, double &eq_lat);
extern void equatorialToEcliptic(const double eq_lon, const double eq_lat,
const double eps,
double &ec_lon, double &ec_lat);
extern void calcGreatArc(const double slon, const double slat,
const double elon, const double elat,
double &trueCourse, double &dist);
extern double gmst(const double T, const time_t tv_sec);
extern void rotateXYZ(double matrix[3][3], const double angle_x,
const double angle_y, const double angle_z);
extern void rotateZYX(double matrix[3][3], const double angle_x,
const double angle_y, const double angle_z);
extern void deleteImage(unsigned char *&rgb_data);
extern int readImageFile(string filename, int &width, int &height,
unsigned char *&rgb_data);
extern bool fileExists(string &filename);
extern bool imageFileExists(string &filename);
extern void sunpos(const double T);
extern double getSunLat();
extern double getSunLon();
extern double getSunDist();
extern void setSunLat(double lat);
extern void setSunLon(double lon);
extern double getMoonLat();
extern double getMoonLon();
extern double getMoonDist();
extern void setMoonLat(double lat);
extern void setMoonLon(double lon);
#endif
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