54 lines
1.4 KiB
Plaintext
54 lines
1.4 KiB
Plaintext
(ns game-of-life
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"Conway's Game of Life, based on the work of
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Christophe Grand (http://clj-me.cgrand.net/2011/08/19/conways-game-of-life)
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and Laurent Petit (https://gist.github.com/1200343).")
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;;; Core game of life's algorithm functions
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(defn neighbors
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"Given a cell's coordinates `[x y]`, returns the coordinates of its
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neighbors."
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[[x y]]
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(for [dx [-1 0 1]
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dy (if (zero? dx)
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[-1 1]
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[-1 0 1])]
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[(+ dx x) (+ dy y)]))
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(defn step
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"Given a set of living `cells`, computes the new set of living cells."
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[cells]
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(set (for [[cell n] (frequencies (mapcat neighbors cells))
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:when (or (= n 3)
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(and (= n 2)
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(cells cell)))]
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cell)))
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;;; Utility methods for displaying game on a text terminal
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(defn print-grid
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"Prints a `grid` of `w` columns and `h` rows, on *out*, representing a
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step in the game."
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[grid w h]
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(doseq [x (range (inc w))
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y (range (inc h))]
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(when (= y 0) (println))
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(print (if (grid [x y])
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"[X]"
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" . "))))
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(defn print-grids
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"Prints a sequence of `grids` of `w` columns and `h` rows on *out*,
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representing several steps."
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[grids w h]
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(doseq [grid grids]
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(print-grid grid w h)
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(println)))
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;;; Launches an example grid
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(def grid
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"`grid` represents the initial set of living cells"
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#{[2 1] [2 2] [2 3]})
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(print-grids (take 3 (iterate step grid)) 5 5) |