The single most useful comment that I can remember making, which was tied to a surprisingly well-named pair of variables that just happened to look awful, was, THINK CARTESIAN! x and y represent Cartesian coordinates. Keep that in mind and all will make sense.

Whenever I tried to describe what I was doing in the code in words, I failed. But with the picture in hand it was dead obvious how to manipulate the grid. :-)

In reply to Re (tilly) 2: Another commenting question, by tilly
in thread Another commenting question, by scottstef

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