P

#include<GL/glut.h>
float a=0;
float angle[20]={0,90,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0};
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();
glTranslatef(angle[3], angle[4], angle[5]);
glPushMatrix();
glRotatef(angle[0],0,0,1);
glutSolidTeapot(0.3);
glPopMatrix();
glutSwapBuffers();
glTranslatef(0.5,0,0);
glRotatef(angle[1], 0,0,1);
glutSolidTeapot(0.3);
glPopMatrix();
glPopMatrix();
glutSwapBuffers();
}

void readNext()
{

a+=0.1;
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();
}