Help checking a grid

When the function calls itself, how do you make sure it's not going back to the same place? What if you had a circle of them? That would infinite loop... *thinks* I guess I could get an array of grid locations and use it like a stack. Start at 0,1: Store 0,1 in 'stack' Find next at 1,1: Store 1,1 in 'stack' Find next at 1,2: Store 1,2 in 'stack' Find next at 2,2: Store 2,2 in 'stack' Find next at 2,1: Store 2,1 in 'stack' Find next at 1,1: 1,1 already exists in 'stack' do not take. And then when I fall out of an iteration, I can set the most recent location in the 'stack' back to -1,-1. That may be hard to code correctly... I suppose if I sat down and worked on it, I might find out... but meh. I'll do it later.

Yea, I ran across a problem with it bouncing between two spots. It wasn't a very elegant method to solve it, but I passed two more arguments to the function: the old r and the old c values, and made sure it didn't go back to that location. That made it work for me.

I guess you could have a parallell boolean grid and mark true false for spots you've been also . . . I haven't tried that though.