I’ve been meaning to make a “pretty” implementation of an Xscreensaver hack for ages. It’s called “demon”, and it features a random grid of colored cells that end up in swirling color patterns. I finally got around to trying it out, and used it as an opportunity to play with Mac OS X’s graphics APIs.

Code!

Without any particular context, here is how I iterate. Note that I make the edges wrap around. If the syntax is slightly wacky-looking that’s because it’s Objective C.

The logic itself is fairly simple; at each iteration, one particular color of cell gets to “eat” any neighbors of the previous color. To wit: First the red pixels gets to eat their purple neighbors, then the orange pixels get to eat their red neighbors, then the yellow the orange, and so on, until red comes around again. Stable arrangements come up when you have cyclical patterns where the colors can chase one another forever without getting consumed or any one color is entirely eliminated, at which point a cycle can never emerge.

- iterate{ static int c = 0;

Source: Home of the Ghostlords

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2024-06-28 22:07:04 by blackskimmer

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Phones Clearance Sale Hurry While Stocks Last ! A cellular automaton (pl. cellular automata, abbrev. CA) is a discrete model studied in computability theory, mathematics, physics, complexity science,.

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