#! /usr/bin/env python
"""
animi.py is a program which generates a 3D animation
two spheres where one sphere moves towards the other 


Paul Eugenio
PHZ4151C
Feb 1, 2019
"""

from __future__ import division, print_function
from vpython import  sphere, color, vector
from time import sleep


# create two spheres
a=sphere(pos=vector(-5,0,0), radius=0.5, color=color.blue)
b=sphere(pos=vector(6.1,0,0), radius=0.5, color=color.red)

# have one sphere move increasingly faster
# towards the other sphere and stop at the sphere
for i in range(1,11):
	sleep(1/i)
	a.pos.x += 1        # change only the x position