Created
October 8, 2019 10:57
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(ns main (:gen-class)) | |
;; Snake :: [[int int]…] | |
;; vector of x,y tuples | |
;; head is first, tail is last | |
;; out-of-bounds? :: (int int int) -> bool | |
;; grid-size is 1-indexed, x+y are 0-indexed | |
(defn out-of-bounds? [grid-size x y] | |
(or (neg? x) (neg? y) (>= x grid-size) (>= y grid-size))) | |
;; intersects-snake :: (Snake [int int]) -> bool | |
(defn intersects-snake [snake [x y]] | |
(some | |
#(and (= x (first %)) (= y (second %)) true) | |
snake)) | |
;; move-snake :: (int char Snake) -> Snake | |
(defn move-snake [grid-size direction snake] | |
(let [ | |
[x y] (first snake) | |
head (cond | |
(= direction \E) [(+ x 1) y] | |
(= direction \S) [x (+ y 1)] | |
(= direction \W) [(- x 1) y] | |
(= direction \N) [x (- y 1)]) | |
] (butlast (cons head snake)))) | |
;; random-xy :: int -> [int int] | |
(defn random-xy [size] | |
[(rand-int size) (rand-int size)]) | |
;; random-food :: (fn int Snake) -> [int int] | |
(defn random-food [random-xy size snake] | |
(let [xy (atom (random-xy size))] | |
(while (intersects-snake snake @xy) | |
(swap! xy (fn [& xs] (random-xy size)))) | |
@xy)) | |
(defn -main | |
[& args] | |
(println "Hello, World!")) |
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