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/***********************************************************************
* starmap.h: Declaration of global variables, constants, data types,
* and functions used all around the program.
***********************************************************************/
/***********************************************************************
* This file is part of SpaceChart.
* Copyright (C) 1999, 2000 Miguel Coca <e970095@zipi.fi.upm.es>
*
* 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 _INCLUDE_STARMAP_H_
#define _INCLUDE_STARMAP_H_
#include <math.h>
#define THETA ( M_PI / 3 )
#define PARSEC_TO_LY 3.2
#include "config.h"
#include <gnome.h>
/* Global variables. */
extern const char *app_name;
extern const char *app_version;
extern const char *app_authors[];
typedef int star_id_t;
typedef enum
{
DISTANCE_PARSECS,
DISTANCE_LIGHT_YEARS
} distance_unit_t;
typedef struct
{
double x;
double y;
double z;
} coords_3d_t;
/* Converts a vector to polar form */
void cartesian_to_polar( coords_3d_t *vector );
/* Converts a vector to cartesian form */
void polar_to_cartesian( coords_3d_t *vector );
/* Returns the distance between points a anb b in the space. */
double distance_3d( coords_3d_t* a, coords_3d_t* b );
/* Calculate the magnitude of vector. */
double magnitude( coords_3d_t *vector );
/* End the program displaying a message to the user. */
void emit_error_message( const char* message );
#endif
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