As you can see there is no collision checking implemented as of now but I would like to get some help on how I would check that i'm not doing collision calculations on a particle to it's self.  How do I check this in an array?  Also any help/tips relating to springy collisions would be appreciated as i'm planning to make a pseudo fluid with repulsion and attraction forces.

Thanks!

edit: btw "oloc" was going to be old location but i didn't need that for what i was doing.