257 lines
8.3 KiB
C++
257 lines
8.3 KiB
C++
/**************************************************************************
|
|
* solarsystem.cxx
|
|
* Written by Durk Talsma. Originally started October 1997, for distribution
|
|
* with the FlightGear project. Version 2 was written in August and
|
|
* September 1998. This code is based upon algorithms and data kindly
|
|
* provided by Mr. Paul Schlyter. (pausch@saaf.se).
|
|
*
|
|
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*
|
|
* $Id$
|
|
* (Log is kept at end of this file)
|
|
**************************************************************************/
|
|
#include <GL/glut.h>
|
|
#include <XGL/xgl.h>
|
|
#include <Debug/fg_debug.h>
|
|
#include <Time/sunpos.hxx>
|
|
#include "solarsystem.hxx"
|
|
|
|
/***************************************************************************
|
|
* default constructor for class SolarSystem:
|
|
* or course there can only be one way to create an entire solar system -:) )
|
|
* the fgTIME argument is needed to properly initialize the the current orbital
|
|
* elements
|
|
*************************************************************************/
|
|
SolarSystem::SolarSystem(fgTIME *t)
|
|
{
|
|
if (theSolarSystem)
|
|
{
|
|
fgPrintf(FG_GENERAL, FG_EXIT, "Error: only one solarsystem allowed\n");
|
|
}
|
|
theSolarSystem = this;
|
|
ourSun = new Star(t);
|
|
earthsMoon = new Moon(t);
|
|
mercury = new Mercury(t);
|
|
venus = new Venus(t);
|
|
mars = new Mars(t);
|
|
jupiter = new Jupiter(t);
|
|
saturn = new Saturn(t);
|
|
uranus = new Uranus(t);
|
|
neptune = new Neptune(t);
|
|
|
|
displayList = 0;
|
|
};
|
|
|
|
/* --------------------------------------------------------------------------
|
|
the destructor for class SolarSystem;
|
|
danger: Huge Explosions ahead! (-:))
|
|
------------------------------------------------------------------------*/
|
|
SolarSystem::~SolarSystem()
|
|
{
|
|
delete ourSun;
|
|
delete earthsMoon;
|
|
delete mercury;
|
|
delete venus;
|
|
delete mars;
|
|
delete jupiter;
|
|
delete saturn;
|
|
delete uranus;
|
|
delete neptune;
|
|
//delete pluto;
|
|
}
|
|
/****************************************************************************
|
|
* void SolarSystem::rebuild()
|
|
*
|
|
* this member function updates the positions for the sun, moon, and planets,
|
|
* and then rebuilds the display list.
|
|
*
|
|
* arguments: none
|
|
* return value: none
|
|
***************************************************************************/
|
|
void SolarSystem::rebuild()
|
|
{
|
|
fgLIGHT *l = &cur_light_params;
|
|
fgTIME *t = &cur_time_params;
|
|
float x, y, z,
|
|
xx, yy,zz;
|
|
double ra, dec;
|
|
double x_2, x_4, x_8, x_10;
|
|
double magnitude;
|
|
GLfloat ambient;
|
|
GLfloat amb[4];
|
|
GLfloat moonColor[4] = {0.85, 0.75, 0.35, 1.0};
|
|
GLfloat black[4] = {0.0, 0.0,0.0,1.0};
|
|
GLfloat white[4] = {1.0, 1.0,1.0,1.0};
|
|
|
|
// Step 1: update all the positions
|
|
ourSun->updatePosition(t);
|
|
earthsMoon->updatePosition(t, ourSun);
|
|
mercury->updatePosition(t, ourSun);
|
|
venus->updatePosition(t, ourSun);
|
|
mars->updatePosition(t, ourSun);
|
|
jupiter->updatePosition(t, ourSun);
|
|
saturn->updatePosition(t, ourSun);
|
|
uranus->updatePosition(t, ourSun);
|
|
neptune->updatePosition(t, ourSun);
|
|
|
|
fgUpdateSunPos(); // get the right sun angle (especially important when
|
|
// running for the first time.
|
|
if (displayList)
|
|
xglDeleteLists(displayList, 1);
|
|
|
|
displayList = xglGenLists(1);
|
|
// Step 2: rebuild the display list
|
|
xglNewList( displayList, GL_COMPILE);
|
|
{
|
|
// Step 2a: Add the moon...
|
|
xglEnable( GL_LIGHTING );
|
|
xglEnable( GL_LIGHT0 );
|
|
// set lighting parameters
|
|
xglLightfv(GL_LIGHT0, GL_AMBIENT, white );
|
|
xglLightfv(GL_LIGHT0, GL_DIFFUSE, white );
|
|
xglEnable( GL_CULL_FACE );
|
|
|
|
// Enable blending, in order to effectively eliminate the dark side of the
|
|
// moon
|
|
glEnable(GL_BLEND);
|
|
glBlendFunc(GL_ONE, GL_ONE);
|
|
earthsMoon->getPos(&ra, &dec);
|
|
x = 60000.0 * cos(ra) * cos (dec);
|
|
y = 60000.0 * sin(ra) * cos (dec);
|
|
z = 60000.0 * sin(dec);
|
|
xx = cos(ra) * cos(dec);
|
|
yy = sin(ra) * cos(dec);
|
|
zz = sin(dec);
|
|
xglMaterialfv(GL_FRONT, GL_AMBIENT, black);
|
|
xglMaterialfv(GL_FRONT, GL_DIFFUSE, moonColor);
|
|
xglPushMatrix();
|
|
{
|
|
earthsMoon->newImage(ra,dec);
|
|
}
|
|
xglPopMatrix();
|
|
glDisable(GL_BLEND);
|
|
xglDisable(GL_LIGHTING);
|
|
|
|
// Step 2b: Add the sun
|
|
x_2 = l -> sun_angle * l->sun_angle;
|
|
x_4 = x_2 * x_2;
|
|
x_8 = x_4 * x_4;
|
|
x_10 = x_8 * x_2;
|
|
ambient = (0.4 * pow (1.1, - x_10 / 30.0));
|
|
if (ambient < 0.3) ambient = 0.3;
|
|
if (ambient > 1.0) ambient = 1.0;
|
|
|
|
amb[0] = 0.00 + ((ambient * 6.0) - 1.0); // minimum value = 0.8
|
|
amb[1] = 0.00 + ((ambient * 11.0) - 3.0); // minimum value = 0.3
|
|
amb[2] = 0.00 + ((ambient * 12.0) - 3.6); // minimum value = 0.0
|
|
amb[3] = 1.00;
|
|
|
|
if (amb[0] > 1.0) amb[0] = 1.0;
|
|
if (amb[1] > 1.0) amb[1] = 1.0;
|
|
if (amb[2] > 1.0) amb[2] = 1.0;
|
|
|
|
ourSun->getPos(&ra, &dec);
|
|
x = 60000.0 * cos(ra) * cos(dec);
|
|
y = 60000.0 * sin(ra) * cos(dec);
|
|
z = 60000.0 * sin(dec);
|
|
xglPushMatrix();
|
|
{
|
|
xglPushMatrix();
|
|
xglTranslatef(x,y,z);
|
|
xglColor3f(amb[0], amb[1], amb[2]);
|
|
glutSolidSphere(1400.0, 10, 10);
|
|
}
|
|
glPopMatrix();
|
|
// Step 2c: Add the planets
|
|
xglBegin(GL_POINTS);
|
|
mercury->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
venus ->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
mars ->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
jupiter->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
saturn ->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
uranus ->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
neptune->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
|
|
xglEnd();
|
|
xglEnable(GL_LIGHTING);
|
|
}
|
|
xglEndList();
|
|
}
|
|
|
|
/*****************************************************************************
|
|
* double SolarSystem::scaleMagnitude(double magn)
|
|
* This private member function rescales the original magnitude, as used in the
|
|
* astronomical sense of the word, into a value used by OpenGL to draw a
|
|
* convincing Star or planet
|
|
*
|
|
* Argument: the astronomical magnitude
|
|
*
|
|
* return value: the rescaled magnitude
|
|
****************************************************************************/
|
|
double SolarSystem::scaleMagnitude(double magn)
|
|
{
|
|
double magnitude = (0.0 - magn) / 5.0 + 1.0;
|
|
magnitude = magnitude * 0.7 + (3 * 0.1);
|
|
if (magnitude > 1.0) magnitude = 1.0;
|
|
if (magnitude < 0.0) magnitude = 0.0;
|
|
return magnitude;
|
|
}
|
|
|
|
/***************************************************************************
|
|
* void SolarSytem::addPlanetToList(double ra, double dec, double magn);
|
|
*
|
|
* This private member function first causes the magnitude to be properly
|
|
* rescaled, and then adds the planet to the display list.
|
|
*
|
|
* arguments: Right Ascension, declination, and magnitude
|
|
*
|
|
* return value: none
|
|
**************************************************************************/
|
|
void SolarSystem::addPlanetToList(double ra, double dec, double magn)
|
|
{
|
|
double
|
|
magnitude = scaleMagnitude ( magn );
|
|
|
|
fgLIGHT *l = &cur_light_params;
|
|
|
|
if ((double) (l->sun_angle - FG_PI_2) >
|
|
((magnitude - 1.0) * - 20 * DEG_TO_RAD))
|
|
{
|
|
xglColor3f (magnitude, magnitude, magnitude);
|
|
xglVertex3f( 50000.0 * cos (ra) * cos (dec),
|
|
50000.0 * sin (ra) * cos (dec),
|
|
50000.0 * sin (dec));
|
|
}
|
|
}
|
|
|
|
|
|
SolarSystem* SolarSystem::theSolarSystem = 0;
|
|
|
|
/******************************************************************************
|
|
* void solarSystemRebuild()
|
|
* this a just a wrapper function, provided for use as an interface to the
|
|
* event manager
|
|
*****************************************************************************/
|
|
void solarSystemRebuild()
|
|
{
|
|
SolarSystem::theSolarSystem->rebuild();
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|