Programa que se Mueve la Pelota

#include <GL/glut.h>

GLfloat anguloCuboX = 0.0f;
GLfloat anguloCuboY = 0.0f;
GLfloat anguloEsfera = 0.0f;
GLfloat TrasEsferax= 3.0f;
GLfloat TrasEsferay= 0.0f;
GLfloat TrasEsferaz= -5.0f;

GLint ancho=400;
GLint alto=400;

int hazPerspectiva = 0;

void reshape(int width, int height)
{
    glViewport(0, 0, width, height);
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
   
    if(hazPerspectiva)
 gluPerspective(60.0f, (GLfloat)width/(GLfloat)height, 1.0f, 20.0f);
    else
 glOrtho(-4,4, -4, 4, 1, 10);
    glMatrixMode(GL_MODELVIEW);

    ancho = width;
    alto = height;
}

void drawCube(void)
{
    glColor3f(0.0f, 0.0f, 0.5f);
    glBegin(GL_QUADS);      
    glVertex3f( 4.0f,-4.0f, -4.0f);
    glVertex3f( 4.0f,-4.0f,  4.0f);
    glVertex3f(-4.0f,-4.0f,  4.0f);
    glVertex3f(-4.0f,-4.0f, -4.0f);
    glEnd();
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

    glTranslatef(0.0f, 0.0f, -5.0f);

   glRotatef(5, 1.0f, 0.0f, 0.0f);
   glRotatef(5, 0.0f, 1.0f, 0.0f);
    drawCube();
    glLoadIdentity();
    glTranslatef(TrasEsferax,TrasEsferay,TrasEsferaz);
   
    glColor3f(0.0f, 1.0f, 0.0f);
    glutWireSphere(0.5f, 8, 8);
    glFlush();
    glutSwapBuffers();

}
void init()
{
    glClearColor(0,0,0,0);
    glEnable(GL_DEPTH_TEST);
    ancho = 400;
    alto = 400;
}

void idle()
{
    display();
}

void keyboard(unsigned char key, int x, int y)
{
    switch(key)
    {
    case 'p':
    case 'P':
 hazPerspectiva=1;
 reshape(ancho,alto);
 break;

    case 'o':
    case 'O':
 hazPerspectiva=0;
 reshape(ancho,alto);
 break;
 case 'j':
    case 'J':
    TrasEsferax-=1.0;
  break;
 case 'l':
    case 'L':
    TrasEsferax+=1.0;
  break;
 case 'i':
    case 'I':
    TrasEsferay+=1.0;
  break;
 case 'k':
    case 'K':
    TrasEsferay-=1.0;
  break;
 case 'u':
    case 'U':
    TrasEsferaz+=0.5;
  break;
 
 case 'y':
    case 'Y':
    TrasEsferaz-=0.5;
  break;

    case 27:  
// exit(0);
      break;
    }
}

int main(int argc, char **argv)
{
    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);
    glutInitWindowPosition(100, 100);
    glutInitWindowSize(ancho, alto);
    glutCreateWindow("Piso y pelota");
    init();
    glutDisplayFunc(display);
    glutReshapeFunc(reshape);
    glutIdleFunc(idle);
    glutKeyboardFunc(keyboard);
    glutMainLoop();
    return 0;
}

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