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-rw-r--r--net/ricketyspace/ror/six/snakes.rkt358
1 files changed, 358 insertions, 0 deletions
diff --git a/net/ricketyspace/ror/six/snakes.rkt b/net/ricketyspace/ror/six/snakes.rkt
new file mode 100644
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--- /dev/null
+++ b/net/ricketyspace/ror/six/snakes.rkt
@@ -0,0 +1,358 @@
+#lang racket
+(require 2htdp/universe 2htdp/image)
+
+;; data
+(struct pit (snake-1 snake-2 goos obstacles dinged))
+(struct snake (dir segs))
+(struct goo (loc expire type))
+(struct obstacle (loc expire))
+(struct posn (x y))
+
+;; constants
+(define TICK-RATE 1/10)
+
+(define SIZE 30)
+
+(define SEG-SIZE 15)
+
+(define EXPIRATION-TIME 150)
+(define OBSTACLE-EXPIRATION-TIME 250)
+
+(define WIDTH-PX (* SEG-SIZE 30))
+(define HEIGHT-PX (* SEG-SIZE 30))
+
+(define MT-SCENE (empty-scene WIDTH-PX HEIGHT-PX))
+(define GOO-IMG (bitmap "resources/goo.gif"))
+(define GOO-RED-IMG (bitmap "resources/goo-red.gif"))
+(define OBSTACLE-IMG (bitmap "resources/obstacle.gif"))
+(define SEG-IMG (bitmap "resources/body.gif"))
+(define HEAD-IMG (bitmap "resources/head.gif"))
+
+(define HEAD-LEFT-IMG HEAD-IMG)
+(define HEAD-DOWN-IMG (rotate 90 HEAD-LEFT-IMG))
+(define HEAD-RIGHT-IMG (flip-horizontal HEAD-LEFT-IMG))
+(define HEAD-UP-IMG (flip-vertical HEAD-DOWN-IMG))
+
+(define ENDGAME-TEXT-SIZE 15)
+
+;; main
+(define (start-snakes)
+ (big-bang (pit (snake "right" (list (posn 1 1)))
+ (snake "d" (list (posn 1 10)))
+ (list (fresh-goo)
+ (fresh-goo)
+ (fresh-goo)
+ (fresh-goo)
+ (fresh-goo)
+ (fresh-goo))
+ (list (fresh-obstacle)
+ (fresh-obstacle))
+ 0)
+ (on-tick next-pit TICK-RATE)
+ (on-pad direct-snakes)
+ (to-draw render-pit)
+ (stop-when dead? render-end)))
+
+(define (next-pit w)
+ (define snake-1 (pit-snake-1 w))
+ (define snake-2 (pit-snake-2 w))
+ (define goos (pit-goos w))
+ (define obstacles (pit-obstacles w))
+ (define dinged (pit-dinged w))
+ (define goo-to-eat-sn1 (can-eat snake-1 goos))
+ (define goo-to-eat-sn2 (can-eat snake-2 goos))
+ (cond [(and goo-to-eat-sn1 goo-to-eat-sn2) ; sn1 and sn2 dinged.
+ (pit (grow-size snake-1 (goo-type goo-to-eat-sn1))
+ (grow-size snake-2 (goo-type goo-to-eat-sn2))
+ (age-goo (eat (eat goos goo-to-eat-sn1) goo-to-eat-sn2))
+ (age-obstacle obstacles) (+ 2 dinged))]
+ [(and goo-to-eat-sn1 (not goo-to-eat-sn2)) ; sn1 dinged.
+ (pit (grow-size snake-1 (goo-type goo-to-eat-sn1))
+ (slither snake-2)
+ (age-goo (eat goos goo-to-eat-sn1))
+ (age-obstacle obstacles) (+ 1 dinged))]
+ [(and (not goo-to-eat-sn1) goo-to-eat-sn2) ; sn2 dinged.
+ (pit (slither snake-1)
+ (grow-size snake-2 (goo-type goo-to-eat-sn2))
+ (age-goo (eat goos goo-to-eat-sn2))
+ (age-obstacle obstacles) (+ 1 dinged))]
+ [else ; none dinged.
+ (pit (slither snake-1)
+ (slither snake-2)
+ (age-goo goos)
+ (age-obstacle obstacles) dinged)]))
+
+
+(define (direct-snakes w ke)
+ (cond [(arrow-key? ke) (direct-snake-1 w ke)]
+ [(wasd-key? ke) (direct-snake-2 w ke)]
+ [else w]))
+
+(define (direct-snake-1 w ke)
+ (world-change-dir 1 w ke))
+
+(define (direct-snake-2 w ke)
+ (world-change-dir 2 w ke))
+
+(define (render-pit w)
+ (snake+scene (pit-snake-1 w)
+ (snake+scene (pit-snake-2 w)
+ (goo-list+scene (pit-goos w)
+ (obstacle-list+scene
+ (pit-obstacles w) MT-SCENE)))))
+
+(define (dead? w)
+ (define snake-1 (pit-snake-1 w))
+ (define snake-2 (pit-snake-2 w))
+ (define (colliding? sn sn-other)
+ (or (self-colliding? sn)
+ (wall-colliding? sn)
+ (obstacle-colliding? sn (pit-obstacles w))
+ (snake-colliding? sn sn-other)))
+ (or (colliding? snake-1 snake-2) (colliding? snake-2 snake-1)))
+
+(define (render-end w)
+ (overlay (above (text "Game Over" ENDGAME-TEXT-SIZE "black")
+ (text (string-append "Dinged "
+ (number->string (pit-dinged w))
+ " goos.")
+ ENDGAME-TEXT-SIZE "black"))
+ (render-pit w)))
+
+
+;; clock
+(define (can-eat snake goos)
+ (cond [(empty? goos) #f]
+ [else (if (close? (snake-head snake) (first goos))
+ (first goos)
+ (can-eat snake (rest goos)))]))
+
+(define (eat goos goo-to-eat)
+ (append (list (fresh-goo)) (remove goo-to-eat goos)))
+
+(define (close? s g)
+ (posn=? s (goo-loc g)))
+
+(define (grow-size sn size)
+ (cond [(= size 0) sn]
+ [else (grow-size (grow sn) (- size 1))]))
+
+(define (grow sn)
+ (snake (snake-dir sn)
+ (cons (next-head sn) (snake-segs sn))))
+
+(define (slither sn)
+ (snake (snake-dir sn)
+ (cons (next-head sn) (all-but-last (snake-segs sn)))))
+
+(define (next-head sn)
+ (define head (snake-head sn))
+ (define dir (snake-dir sn))
+ (cond [(or (string=? dir "up") (string=? dir "w")) (posn-move head 0 -1)]
+ [(or (string=? dir "down") (string=? dir "s")) (posn-move head 0 1)]
+ [(or (string=? dir "left") (string=? dir "a")) (posn-move head -1 0)]
+ [(or (string=? dir "right") (string=? dir "d")) (posn-move head 1 0)]))
+
+(define (posn-move p dx dy)
+ (posn (+ (posn-x p) dx)
+ (+ (posn-y p) dy)))
+
+(define (all-but-last segs)
+ (cond [(empty? (rest segs)) empty]
+ [else (cons (first segs) (all-but-last (rest segs)))]))
+
+(define (age-goo goos)
+ (rot (renew goos)))
+
+(define (renew goos)
+ (cond [(empty? goos) empty]
+ [(rotten? (first goos))
+ (append (fresh-goos) (renew (rest goos)))]
+ [else
+ (append (list (first goos)) (renew (rest goos)))]))
+
+(define (rot goos)
+ (cond [(empty? goos) empty]
+ [else (cons (decay (first goos)) (rot (rest goos)))]))
+
+(define (rotten? g)
+ (zero? (goo-expire g)))
+
+(define (decay g)
+ (goo (goo-loc g) (sub1 (goo-expire g)) (goo-type g)))
+
+(define (fresh-goo)
+ (goo (posn (add1 (random (sub1 SIZE)))
+ (add1 (random (sub1 SIZE))))
+ EXPIRATION-TIME
+ (random 1 3)))
+
+(define (fresh-goos)
+ (define (gen-goos n)
+ (cond [(= n 0) empty]
+ [else (cons (fresh-goo) (gen-goos (- n 1)))]))
+ (let ((n (random 3)))
+ (gen-goos n)))
+
+(define (age-obstacle obstacles)
+ (rot-obstacles (renew-obstacles obstacles)))
+
+(define (renew-obstacles obstacles)
+ (cond [(empty? obstacles) empty]
+ [(obstacle-expired? (first obstacles))
+ (cons (fresh-obstacle) (renew-obstacles (rest obstacles)))]
+ [else
+ (cons (first obstacles) (renew-obstacles (rest obstacles)))]))
+
+(define (rot-obstacles obstacles)
+ (cond [(empty? obstacles) empty]
+ [else (cons (decay-obstacle (first obstacles))
+ (rot-obstacles (rest obstacles)))]))
+
+(define (obstacle-expired? obs)
+ (zero? (obstacle-expire obs)))
+
+(define (decay-obstacle obs)
+ (obstacle (obstacle-loc obs) (sub1 (obstacle-expire obs))))
+
+(define (fresh-obstacle)
+ (obstacle (posn (add1 (random (sub1 SIZE)))
+ (add1 (random (sub1 SIZE))))
+ OBSTACLE-EXPIRATION-TIME))
+
+;; keys
+(define (dir? x)
+ (or (arrow-key? x)
+ (wasd-key? x)))
+
+(define (arrow-key? x)
+ (or (key=? x "up")
+ (key=? x "down")
+ (key=? x "left")
+ (key=? x "right")))
+
+(define (wasd-key? x)
+ (or (key=? x "w")
+ (key=? x "s")
+ (key=? x "a")
+ (key=? x "d")))
+
+(define (world-change-dir sn-number w d)
+ (define snake-1 (pit-snake-1 w))
+ (define snake-2 (pit-snake-2 w))
+ (cond [(and (= sn-number 1) ;snake-1
+ (opposite-dir? (snake-dir snake-1) d)
+ (cons? (rest (snake-segs snake-1))))
+ (stop-with w)]
+ [(and (= sn-number 2) ;snake-2
+ (opposite-dir? (snake-dir snake-2) d)
+ (cons? (rest (snake-segs snake-2))))
+ (stop-with w)]
+ [(= sn-number 1) ;snake-1 change dir.
+ (pit (snake-change-dir snake-1 d)
+ (pit-snake-2 w)
+ (pit-goos w)
+ (pit-obstacles w)
+ (pit-dinged w))]
+ [else ;snake-2 change dir.
+ (pit (pit-snake-1 w)
+ (snake-change-dir snake-2 d)
+ (pit-goos w)
+ (pit-obstacles w)
+ (pit-dinged w))]))
+
+(define (opposite-dir? d1 d2)
+ (cond [(string=? d1 "up") (string=? d2 "down")]
+ [(string=? d1 "down") (string=? d2 "up")]
+ [(string=? d1 "left") (string=? d2 "right")]
+ [(string=? d1 "right") (string=? d2 "left")]
+ [(string=? d1 "w") (string=? d2 "s")]
+ [(string=? d1 "s") (string=? d2 "w")]
+ [(string=? d1 "a") (string=? d2 "d")]
+ [(string=? d1 "d") (string=? d2 "a")]))
+
+
+;; render
+(define (snake+scene snake scene)
+ (define snake-body-scene
+ (img-list+scene (snake-body snake) SEG-IMG scene))
+ (define dir (snake-dir snake))
+ (img+scene (snake-head snake)
+ (cond [(or (string=? "up" dir) (string=? "w" dir))
+ HEAD-UP-IMG]
+ [(or (string=? "down" dir) (string=? "s" dir))
+ HEAD-DOWN-IMG]
+ [(or (string=? "left" dir) (string=? "a" dir))
+ HEAD-LEFT-IMG]
+ [(or (string=? "right" dir) (string=? "d" dir))
+ HEAD-RIGHT-IMG])
+ snake-body-scene))
+
+(define (goo-list+scene goos scene)
+ (define (get-posns-from-goo goos type)
+ (cond [(empty? goos) empty]
+ [(= (goo-type (first goos)) type)
+ (cons (goo-loc (first goos))
+ (get-posns-from-goo (rest goos) type))]
+ [else (get-posns-from-goo (rest goos) type)]))
+ (img-list+scene (get-posns-from-goo goos 1) GOO-IMG
+ (img-list+scene (get-posns-from-goo goos 2)
+ GOO-RED-IMG scene)))
+
+(define (obstacle-list+scene obstacles scene)
+ (define (get-posns-from-obstacle obstacles)
+ (cond [(empty? obstacles) empty]
+ [else (cons (obstacle-loc (first obstacles))
+ (get-posns-from-obstacle (rest obstacles)))]))
+ (img-list+scene (get-posns-from-obstacle obstacles)
+ OBSTACLE-IMG scene))
+
+(define (img-list+scene posns img scene)
+ (cond [(empty? posns) scene]
+ [else (img+scene
+ (first posns)
+ img
+ (img-list+scene (rest posns) img scene))]))
+
+(define (img+scene posn img scene)
+ (place-image img
+ (* (posn-x posn) SEG-SIZE)
+ (* (posn-y posn) SEG-SIZE)
+ scene))
+
+
+;; end game
+(define (self-colliding? snake)
+ (cons? (member (snake-head snake) (snake-body snake))))
+
+(define (wall-colliding? snake)
+ (define x (posn-x (snake-head snake)))
+ (define y (posn-y (snake-head snake)))
+ (or (= 0 x) (= x SIZE)
+ (= 0 y) (= y SIZE)))
+
+(define (obstacle-colliding? snake obstacles)
+ (cond [(empty? obstacles) #f]
+ [(posn=? (snake-head snake)
+ (obstacle-loc (first obstacles))) #t]
+ [else (obstacle-colliding? snake (rest obstacles))]))
+
+(define (snake-colliding? snake snake-other)
+ (cons? (member (snake-head snake) (snake-segs snake-other))))
+
+;; aux
+(define (posn=? p1 p2)
+ (and (= (posn-x p1) (posn-x p2))
+ (= (posn-y p1) (posn-y p2))))
+
+(define (snake-head sn)
+ (first (snake-segs sn)))
+
+(define (snake-body sn)
+ (rest (snake-segs sn)))
+
+(define (snake-tail sn)
+ (last (snake-segs sn)))
+
+(define (snake-change-dir sn d)
+ (snake d (snake-segs sn)))
siddharth ravikumar snafu