[ تمت الإجابة ]كود لرسم دوران الارض حول الشمس OpenGL

#include <stdlib.h>
#include <GL/glut.h>


float time;
int Xrotate=0,Yrotate=0,Zmove=0,Xmove=0,Ymove=0,Xprec=0,Yprec=0;
static GLfloat sun_col[4]={1,.5,.2,1};
static GLfloat moon_col[4]={1,1,1,1};
static GLfloat p_col[4]={.2,.2,1,1};
void init(void)
{
 glEnable(GL_DEPTH_TEST);
 static GLfloat lightpos0[4]={0.0,3.0,3.0,0.0};
 static GLfloat lightpos1[4]={0.0,-3.0,3.0,0.0};
 static GLfloat lightamb1[4]={0.2,0.2,0.2,0.0};
 static GLfloat lightdif1[4]={1.0,1.0,1.0,1.0};
 static GLfloat lightape1[4]={1.0,1.0,1.0,1.0};
 glLightfv(GL_LIGHT0,GL_POSITION,lightpos0);
 glLightfv(GL_LIGHT1,GL_POSITION,lightpos1);
 glLightfv(GL_LIGHT1,GL_AMBIENT,lightamb1);
 glLightfv(GL_LIGHT1,GL_DIFFUSE,lightdif1);
 glLightfv(GL_LIGHT1,GL_SPECULAR,lightape1);
 glEnable(GL_LIGHTING);
 glEnable(GL_LIGHT0);
}
GLdouble get_secs()
{
 return glutGet(GLUT_ELAPSED_TIME)/500.0;
}
void display(void)
{
time=(GLfloat) get_secs();
glClear (GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
                    /*camera position and rotating*/
glTranslatef(Xmove,Ymove-1.0,Zmove-12.0);
glRotatef(Yrotate+10,1,0,0);
glRotatef(Xrotate+60,0,1,0);
                    /* draw sun */
glTranslatef (10.0, 0.0, 0.0);
glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,sun_col);
glutSolidSphere(1.2, 50, 50); 
GLfloat lightpos1[4]={10.0,0.0,0.0,0.0};
glLightfv(GL_LIGHT1,GL_POSITION,lightpos1);
glEnable(GL_LIGHT1);
                    /* draw the planets and their moons */
glPushMatrix();/* planet */
glRotatef (time*9+100, 0.0, 1.0, 0.0); 
glTranslatef (5.0, 0.0, 0.0);
glRotatef (time*500, 0.0, 1.0, 0.0);
glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,p_col);
glutSolidSphere(0.35, 50, 50);


glRotatef (time*250, 0.0, 1.0, 0.0);/*moon*/
glTranslatef (0.45, 0.0, 0.0);
glRotatef (time*200, 1.0, 1.0, 0.0);
glMaterialfv(GL_FRONT,GL_AMBIENT_AND_DIFFUSE,moon_col);
glutSolidSphere(0.05,50, 50); 
glPopMatrix();
glutSwapBuffers();
}
void keyboard (unsigned char key, int x, int y)
{
switch (key) 
{
 case 27:exit(1);break;
}
}


void reshape (int w, int h)
{
glViewport (0, 0, (GLsizei) w, (GLsizei) h);
glMatrixMode (GL_PROJECTION);
glLoadIdentity();
gluPerspective(60.0, (GLfloat) w/(GLfloat) h, 1.0, 100.0);
gluLookAt(0,0,4,0,0,0,0,1,0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}


void motion(int x,int y)
{
  Xrotate-=(x-Xprec)/2;Yrotate-=(y-Yprec)/2;
  Xprec=x;Yprec=y;
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
glutInitWindowSize (500, 500);
glutInitWindowPosition (100, 50);
glutCreateWindow (argv[0]);
init ();
glutDisplayFunc(display);
glutIdleFunc(display);
glutReshapeFunc(reshape);
glutMotionFunc(motion);
glutKeyboardFunc(keyboard);
glutFullScreen();
glutMainLoop();
return 0;
}