126 lines
3.0 KiB
C
126 lines
3.0 KiB
C
/**************************************************************************
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* astro.c
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*
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* Written by Durk Talsma. Started November 1997, for use with the flight
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* gear project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* $Id$
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* (Log is kept at end of this file)
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**************************************************************************/
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#include <math.h>
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#include <stdio.h>
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#include <string.h>
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#include <time.h>
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#include <GL/glut.h>
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#include "astro.h"
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#include "moon.h"
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#include "orbits.h"
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#include "planets.h"
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#include "stars.h"
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#include "sun.h"
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#include "../constants.h"
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#include "../general.h"
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#include "../Main/views.h"
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#include "../Aircraft/aircraft.h"
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#include "../Time/fg_time.h"
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static double prevUpdate = 0;
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/* Initialize Astronomical Objects */
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void fgAstroInit() {
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struct fgTIME *t;
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t = &cur_time_params;
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/* Initialize the orbital elements of sun, moon and mayor planets */
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fgSolarSystemInit(*t);
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/* Intialize the moon's position */
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fgMoonInit();
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/* Initialize the sun's position */
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fgSunInit();
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/* Initialize the Stars subsystem */
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fgStarsInit();
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}
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/* Render Astronomical Objects */
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void fgAstroRender() {
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struct FLIGHT *f;
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struct VIEW *v;
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struct fgTIME *t;
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double angle;
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f = ¤t_aircraft.flight;
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t = &cur_time_params;
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v = ¤t_view;
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/* a hack: Force sun and moon position to be updated on an hourly basis */
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if (((t->gst - prevUpdate) > 1) || (t->gst < prevUpdate)) {
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prevUpdate = t->gst;
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fgSunInit();
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fgMoonInit();
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}
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/* Disable fog effects */
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glDisable( GL_FOG );
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/* reverse light direction so the moon is displayed properly */
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glLightfv( GL_LIGHT0, GL_POSITION, t->sun_vec_inv );
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glPushMatrix();
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/* Translate to view position */
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glTranslatef( v->view_pos.x, v->view_pos.y, v->view_pos.z );
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/* Rotate based on gst (side real time) */
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angle = t->gst * 15.041085; /* should be 15.041085, Curt thought it was 15*/
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#ifdef DEBUG
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printf("Rotating astro objects by %.2f degrees\n",angle);
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#endif
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glRotatef( angle, 0.0, 0.0, -1.0 );
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/* render the stars */
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fgStarsRender();
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/* render the moon */
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fgMoonRender();
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/* render the sun */
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fgSunRender();
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glPopMatrix();
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/* reenable fog effects */
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glEnable( GL_FOG );
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}
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/* $Log$
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/* Revision 1.1 1997/11/25 23:20:22 curt
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/* Initial revision.
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/*
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*/
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