#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();
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+=0.1;
for(int i=0;i<20;i++) angle[i] = angleOld[i]*(1-a)+angleNew[i]*a;
}
void timer(int t){
glutTimerFunc(10, 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();

}