15. Another Challenge
Make sure you have done the warm-up conditional patterns before this!
- 
Pick two centers, say (300,150) and (310, 150).
 - 
Use a big 500x300 canvas.
 - 
Colors:
- magenta when the distance to both centers is less than 15
 - red when the distance to left point is less than 15
 - blue when the distance to right point is less than 15
 - white when the distance to either point is less than 30
 - gray otherwise
 
 
 
- 
Move the centers to (175,150) and (325, 150). Repeat the pattern by reducing distances to less than 30 by using remainder.