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Sun now appears to grow in size as it gets very low in the horizon.

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curt 1998-12-08 21:42:31 +00:00 committed by Tim Moore
parent 256aaa362f
commit 50227c435c
2 changed files with 31 additions and 44 deletions
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62
Astro/solarsystem.cxx
View File

@ -31,7 +31,6 @@
# include <windows.h> # include <windows.h>
#endif #endif
#ifdef __BORLANDC__ #ifdef __BORLANDC__
# define exception c_exception # define exception c_exception
#endif #endif
@ -100,8 +99,9 @@ void SolarSystem::rebuild()
{ {
fgLIGHT *l = &cur_light_params; fgLIGHT *l = &cur_light_params;
fgTIME *t = &cur_time_params; fgTIME *t = &cur_time_params;
float x, y, z, float x, y, z;
xx, yy,zz; // float xx, yy,zz;
double sun_angle;
double ra, dec; double ra, dec;
double x_2, x_4, x_8, x_10; double x_2, x_4, x_8, x_10;
double magnitude; double magnitude;
@ -144,12 +144,6 @@ void SolarSystem::rebuild()
glEnable(GL_BLEND); glEnable(GL_BLEND);
glBlendFunc(GL_ONE, GL_ONE); glBlendFunc(GL_ONE, GL_ONE);
earthsMoon->getPos(&ra, &dec); 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_AMBIENT, black);
xglMaterialfv(GL_FRONT, GL_DIFFUSE, moonColor); xglMaterialfv(GL_FRONT, GL_DIFFUSE, moonColor);
xglPushMatrix(); xglPushMatrix();
@ -161,7 +155,8 @@ void SolarSystem::rebuild()
xglDisable(GL_LIGHTING); xglDisable(GL_LIGHTING);
// Step 2b: Add the sun // Step 2b: Add the sun
x_2 = l -> sun_angle * l->sun_angle; sun_angle = l->sun_angle;
x_2 = sun_angle * sun_angle;
x_4 = x_2 * x_2; x_4 = x_2 * x_2;
x_8 = x_4 * x_4; x_8 = x_4 * x_4;
x_10 = x_8 * x_2; x_10 = x_8 * x_2;
@ -169,27 +164,39 @@ void SolarSystem::rebuild()
if (ambient < 0.3) ambient = 0.3; if (ambient < 0.3) ambient = 0.3;
if (ambient > 1.0) ambient = 1.0; if (ambient > 1.0) ambient = 1.0;
amb[0] = 0.00 + ((ambient * 6.0) - 1.0); // minimum value = 0.8 amb[0] = ((ambient * 6.0) - 1.0); // minimum value = 0.8
amb[1] = 0.00 + ((ambient * 11.0) - 3.0); // minimum value = 0.3 amb[1] = ((ambient * 11.0) - 3.0); // minimum value = 0.3
amb[2] = 0.00 + ((ambient * 12.0) - 3.6); // minimum value = 0.0 amb[2] = ((ambient * 12.0) - 3.6); // minimum value = 0.0
amb[3] = 1.00; amb[3] = 1.00;
if (amb[0] > 1.0) amb[0] = 1.0; if (amb[0] > 1.0) amb[0] = 1.0;
if (amb[1] > 1.0) amb[1] = 1.0; if (amb[1] > 1.0) amb[1] = 1.0;
if (amb[2] > 1.0) amb[2] = 1.0; if (amb[2] > 1.0) amb[2] = 1.0;
ourSun->getPos(&ra, &dec); sun_angle = l->sun_angle * RAD_TO_DEG;
x = 60000.0 * cos(ra) * cos(dec); if ( sun_angle < 100 ) {
y = 60000.0 * sin(ra) * cos(dec); ourSun->getPos(&ra, &dec);
z = 60000.0 * sin(dec); double cos_dec = cos(dec) * 60000.0;
xglPushMatrix(); x = cos(ra) * cos_dec;
{ y = sin(ra) * cos_dec;
// xglPushMatrix(); z = sin(dec) * 60000.0;
xglTranslatef(x,y,z); xglPushMatrix();
xglColor3f(amb[0], amb[1], amb[2]); {
glutSolidSphere(1400.0, 10, 10); double sun_size = 1400.0;
// daily variation sun gets larger near horizon
if ( sun_angle > 84.0 ) {
double sun_grow = 9.0 * fabs(94.0 - sun_angle);
sun_size += 0.5 * sun_size * cos( sun_grow * DEG_TO_RAD);
}
xglTranslatef(x,y,z);
xglColor3fv(amb);
glutSolidSphere(sun_size, 10, 10);
}
glPopMatrix();
} else {
// sun angle > 100, no need to draw sun
} }
glPopMatrix();
// Step 2c: Add the planets // Step 2c: Add the planets
xglBegin(GL_POINTS); xglBegin(GL_POINTS);
mercury->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude); mercury->getPos(&ra, &dec, &magnitude);addPlanetToList(ra, dec, magnitude);
@ -263,10 +270,3 @@ void solarSystemRebuild()
{ {
SolarSystem::theSolarSystem->rebuild(); SolarSystem::theSolarSystem->rebuild();
} }

13
Astro/solarsystem.hxx
View File

@ -91,16 +91,3 @@ inline void SolarSystem::draw()
extern void solarSystemRebuild(); extern void solarSystemRebuild();
#endif // _SOLARSYSTEM_H_ #endif // _SOLARSYSTEM_H_