自動播放

                                                  #include <GL/glut.h>

float a = 0;  

float angle[20] = {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; 

float angleOld[20] = {0,90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; 

float angleNew[20] = {90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0}; 

void display()

{

     glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

     glPushMatrix();

      glRotatef(angle[0], 0,0,1);

      glutSolidTeapot(0.3);

     glPopMatrix();

     glPushMatrix();

      glTranslatef(0.5, 0,0);

  glRotatef(angle[1], 0,0,1);

  glutSolidTeapot(0.3);

     glPopMatrix();

     glutSwapBuffers();

}

void readNext()

{

 a += 0.3; 

 for( int i=0; i<=20; i++){ 

  angle[i] = angleOld[i] * (1-a) + angleNew[i] * a;

 }

}

void timer(int t)

{

 glutTimerFunc(100, timer, 0);

 readNext();

 glutPostRedisplay();

} 

void keyboard(unsigned char key, int x, int y)

{

 if (key == 'r'){

  readNext();

 }

 else if (key== 'p'){

  glutTimerFunc(0, timer, 0);

 }

 glutPostRedisplay();

}

int main()

{

 glutInitDisplayMode(GLUT_DOUBLE | GLUT_DEPTH);

 glutCreateWindow("week15");

 

 glutKeyboardFunc(keyboard);

 glutDisplayFunc(display);

 glutMainLoop();

}