C++ - ifing the code a bit.
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curt
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/**************************************************************************
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* sun.c
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*
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* Written 1997 by Durk Talsma, started October, 1997. For the flight gear
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* 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 <config.h>
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#ifdef HAVE_WINDOWS_H
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# include <windows.h>
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#endif
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#include <GL/glut.h>
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#include <XGL/xgl.h>
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#include <Debug/fg_debug.h>
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#include <Include/fg_constants.h>
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#include <Main/views.hxx>
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#include <Time/fg_time.h>
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#include <Time/sunpos.hxx>
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#include "orbits.hxx"
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#include "sun.hxx"
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GLint sun_obj = 0;
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static struct CelestialCoord sunPos;
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fgSUNPOS solarPosition;
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void fgCalcSunPos(struct OrbElements params)
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{
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double EccAnom, xv, yv, v, r;
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/* calculate the eccentric anomaly */
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EccAnom = fgCalcEccAnom(params.M, params.e);
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/* calculate the Suns distance (r) and its true anomaly (v) */
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xv = cos(EccAnom) - params.e;
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yv = sqrt(1.0 - params.e*params.e) * sin(EccAnom);
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v = atan2(yv, xv);
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r = sqrt(xv*xv + yv*yv);
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/* calculate the the Sun's true longitude (lonsun) */
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solarPosition.lonSun = v + params.w;
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/* convert true longitude and distance to ecliptic rectangular
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geocentric coordinates (xs, ys) */
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solarPosition.xs = r * cos (solarPosition.lonSun);
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solarPosition.ys = r * sin (solarPosition.lonSun);
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solarPosition.dist = r;
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/* return solarPosition; */
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}
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struct CelestialCoord fgCalculateSun (struct OrbElements params,
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struct fgTIME t)
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{
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struct CelestialCoord result;
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double xe, ye, ze, ecl, actTime;
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/* calculate the angle between ecliptic and equatorial coordinate
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* system */
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actTime = fgCalcActTime (t);
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ecl = DEG_TO_RAD * (23.4393 - 3.563E-7 * actTime); // Angle now in Rads
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/* calculate the sun's ecliptic position */
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fgCalcSunPos (params);
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/* convert ecliptic coordinates to equatorial rectangular
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* geocentric coordinates */
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xe = solarPosition.xs;
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ye = solarPosition.ys * cos (ecl);
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ze = solarPosition.ys * sin (ecl);
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/* and finally... Calulate Right Ascention and Declination */
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result.RightAscension = atan2 (ye, xe);
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result.Declination = atan2 (ze, sqrt (xe * xe + ye * ye));
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return result;
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}
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/* Initialize the Sun */
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void fgSunInit( void ) {
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struct fgLIGHT *l;
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struct fgTIME *t;
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struct fgVIEW *v;
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float xSun, ySun, zSun;
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/* GLfloat color[4] = { 1.00, 1.00, 1.00, 1.00 }; */
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double x_2, x_4, x_8, x_10;
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GLfloat ambient;
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GLfloat amb[4];
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l = &cur_light_params;
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t = &cur_time_params;
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v = ¤t_view;
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fgPrintf( FG_ASTRO, FG_INFO, " Initializing the Sun\n");
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// Calculate basic sun position
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fgSolarSystemUpdate(&(pltOrbElements[0]), cur_time_params);
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sunPos = fgCalculateSun(pltOrbElements[0], cur_time_params);
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// Calculate additional sun position parameters based on the above
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// position that are needed by other parts of FG
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fgUpdateSunPos();
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fgPrintf( FG_ASTRO, FG_INFO,
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"Sun found at %f (ra), %f (dec)\n",
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sunPos.RightAscension, sunPos.Declination);
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xSun = 60000.0 * cos(sunPos.RightAscension) * cos(sunPos.Declination);
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ySun = 60000.0 * sin(sunPos.RightAscension) * cos(sunPos.Declination);
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zSun = 60000.0 * sin(sunPos.Declination);
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if (sun_obj) {
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xglDeleteLists(sun_obj, 1);
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}
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/* printf("First time through, creating sun display list\n"); */
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sun_obj = xglGenLists(1);
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xglNewList(sun_obj, GL_COMPILE );
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t = &cur_time_params;
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v = ¤t_view;
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l = &cur_light_params;
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x_2 = l->sun_angle * l->sun_angle;
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x_4 = x_2 * x_2;
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x_8 = x_4 * x_4;
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x_10 = x_8 * x_2;
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ambient = (0.4 * pow(1.1, -x_10 / 30.0));
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if ( ambient < 0.3 ) ambient = 0.3;
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if ( ambient > 1.0 ) ambient = 1.0;
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amb[0] = 0.00 + ((ambient * 6.0) - 1.0); /* minimum val = 0.8 */
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amb[1] = 0.00 + ((ambient * 11.0) - 3.0); /* minimum val = 0.3 */
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amb[2] = 0.00 + ((ambient * 12.0) - 3.6); /* minimum val = 0.0 */
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amb[3] = 1.00;
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if (amb[0] > 1.0) amb[0] = 1.0;
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if (amb[1] > 1.0) amb[1] = 1.0;
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if (amb[2] > 1.0) amb[2] = 1.0;
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fgPrintf( FG_ASTRO, FG_DEBUG,
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"Color of the sun: %f, %f, %f\n"
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"Ambient value : %f\n"
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"Sun Angle : %f\n" ,
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amb[0], amb[1], amb[2], ambient, l->sun_angle);
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xglPushMatrix();
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xglTranslatef(xSun, ySun, zSun);
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xglScalef(1400, 1400, 1400);
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xglColor3f(amb[0], amb[1], amb[2]);
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glutSolidSphere(1.0, 10, 10);
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xglPopMatrix();
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xglEndList();
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}
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/* Draw the Sun */
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void fgSunRender( void ) {
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xglCallList(sun_obj);
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}
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/* $Log$
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/* Revision 1.1 1998/04/22 13:21:36 curt
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/* C++ - ifing the code a bit.
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/*
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* Revision 1.10 1998/04/18 04:13:58 curt
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* Moved fg_debug.c to it's own library.
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*
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* Revision 1.9 1998/04/03 21:52:51 curt
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* Converting to Gnu autoconf system.
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*
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* Revision 1.8 1998/03/09 22:47:25 curt
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* Incorporated Durk's updates.
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*
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* Revision 1.7 1998/02/23 19:07:56 curt
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* Incorporated Durk's Astro/ tweaks. Includes unifying the sun position
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* calculation code between sun display, and other FG sections that use this
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* for things like lighting.
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*
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* Revision 1.6 1998/02/12 21:59:39 curt
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* Incorporated code changes contributed by Charlie Hotchkiss
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* <chotchkiss@namg.us.anritsu.com>
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*
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* Revision 1.5 1998/02/02 20:53:24 curt
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* To version 0.29
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*
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* Revision 1.4 1998/01/27 00:47:50 curt
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* Incorporated Paul Bleisch's <bleisch@chromatic.com> new debug message
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* system and commandline/config file processing code.
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*
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* Revision 1.3 1998/01/19 19:27:00 curt
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* Merged in make system changes from Bob Kuehne <rpk@sgi.com>
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* This should simplify things tremendously.
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*
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* Revision 1.2 1998/01/19 18:40:18 curt
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* Tons of little changes to clean up the code and to remove fatal errors
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* when building with the c++ compiler.
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*
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* Revision 1.1 1998/01/07 03:16:20 curt
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* Moved from .../Src/Scenery/ to .../Src/Astro/
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*
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* Revision 1.12 1998/01/05 18:44:36 curt
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* Add an option to advance/decrease time from keyboard.
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*
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* Revision 1.11 1997/12/30 23:09:40 curt
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* Worked on winding problem without luck, so back to calling glFrontFace()
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* 3 times for each scenery area.
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*
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* Revision 1.10 1997/12/30 20:47:54 curt
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* Integrated new event manager with subsystem initializations.
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*
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* Revision 1.9 1997/12/30 16:36:54 curt
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* Merged in Durk's changes ...
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*
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* Revision 1.8 1997/12/19 23:35:00 curt
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* Lot's of tweaking with sky rendering and lighting.
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*
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* Revision 1.7 1997/12/17 23:12:16 curt
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* Fixed so moon and sun display lists aren't recreate periodically.
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*
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* Revision 1.6 1997/12/15 23:55:04 curt
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* Add xgl wrappers for debugging.
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* Generate terrain normals on the fly.
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*
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* Revision 1.5 1997/12/12 21:41:31 curt
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* More light/material property tweaking ... still a ways off.
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*
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* Revision 1.4 1997/12/10 22:37:53 curt
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* Prepended "fg" on the name of all global structures that didn't have it yet.
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* i.e. "struct WEATHER {}" became "struct fgWEATHER {}"
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*
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* Revision 1.3 1997/12/09 05:11:56 curt
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* Working on tweaking lighting.
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*
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* Revision 1.2 1997/11/25 19:25:39 curt
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* Changes to integrate Durk's moon/sun code updates + clean up.
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*
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* Revision 1.1 1997/10/25 03:16:11 curt
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* Initial revision of code contributed by Durk Talsma.
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*
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*/
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