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[gacela.git] / games / asteroids / asteroids.scm

diff --git a/games/asteroids/asteroids.scm b/games/asteroids/asteroids.scm
index 6d477e5bedc35ee5982a53560f2e16b2057c5844..31094314b096d42317e9c65f1abbaded3b9178e2 100644 (file)
--- a/games/asteroids/asteroids.scm
+++ b/games/asteroids/asteroids.scm
@@ -1,49 +1,136 @@
 (set-game-properties! #:title "Gacela Asteroids")
 
-(define max-x (/ (cdr (assoc 'width (get-game-properties))) 2))
+(define max-x (/ (assoc-ref (get-game-properties) 'width) 2))
 (define min-x (- max-x))
-(define max-y (/ (cdr (assoc 'height (get-game-properties))) 2))
+(define max-y (/ (assoc-ref (get-game-properties) 'height) 2))
 (define min-y (- max-y))
 
+(define (update-asteroid! a #:key x y angle vx vy)
+  (cond (x (assoc-set! a 'x x)))
+  (cond (y (assoc-set! a 'y y)))
+  (cond (x (assoc-set! a 'x x)))
+  (cond (x (assoc-set! a 'x x)))
+  (cond (x (assoc-set! a 'x x)))
+
 (define draw-asteroid
   (let ((asteroid (load-texture "Asteroid.png")))
     (lambda (a)
       (to-origin)
-      (translate (car a) (cadr a))
+      (translate (assoc-ref a 'x) (assoc-ref a 'y))
+      (rotate (assoc-ref a 'angle))
       (draw-texture asteroid))))
 
 (define (move-asteroid a)
-  (let* ((x (car a)) (y (cadr a))
-        (vx (caddr a)) (vy (cadddr a))
-        (nx (+ x vx)) (ny (+ y vy)))
-    (cond ((> nx max-x) (set! vx -1))
-         ((< nx min-x) (set! vx 1)))
-    (cond ((> ny max-y) (set! vy -1))
-         ((< ny min-y) (set! vy 1)))
-    (list (+ x vx) (+ y vy) vx vy)))
+  (let* ((x (assoc-ref a 'x)) (y (assoc-ref a 'y))
+        (angle (assoc-ref a 'angle))
+        (vx (assoc-ref a 'vx)) (vy (assoc-ref a 'vy)))
+    (set! x (+ x vx))
+    (set! y (+ y vy))
+    (cond ((> x max-x) (set! vx -1))
+         ((< x min-x) (set! vx 1)))
+    (cond ((> y max-y) (set! vy -1))
+         ((< y min-y) (set! vy 1)))
+
+    (assoc-set! a 'x x)
+    (assoc-set! a 'y y)
+    (assoc-set! a 'angle (+ angle 1))
+    (assoc-set! a 'vx vx)
+    (assoc-set! a 'vy vy)
+    a))
 
 (define draw-ship
   (let ((ship1 (load-texture "Ship1.png"))
        (ship2 (load-texture "Ship2.png")))
     (lambda (s)
       (to-origin)
-      (translate (car s) (cadr s))
-      (rotate (caddr s))
-      (draw-texture ship1))))
+      (translate (assoc-ref s 'x) (assoc-ref s 'y))
+      (rotate (assoc-ref s 'angle))
+      (let ((ship (if (assoc-ref s 'moving) ship2 ship1)))
+       (draw-texture ship)))))
 
 (define (move-ship s)
-  (let ((x (car s)) (y (cadr s))
-       (angle (caddr s))
-       (vx (cadddr s)) (vy (cadddr (cdr s))))
+  (let ((x (assoc-ref s 'x)) (y (assoc-ref s 'y))
+       (angle (assoc-ref s 'angle))
+       (moving (assoc-ref s 'moving)))
     (cond ((key? 'left) (set! angle (+ angle 5)))
          ((key? 'right) (set! angle (- angle 5))))
-    (cond ((key? 'up) (set! y (+ y 3))))
-    (list x y angle vx vy)))
+    (cond ((key? 'up)
+          (let ((r (degrees-to-radians (- angle))))
+            (set! x (+ x (* 4 (sin r))))
+            (set! y (+ y (* 4 (cos r)))))
+          (cond ((> x max-x) (set! x min-x))
+                ((< x min-x) (set! x max-x)))
+          (cond ((> y max-y) (set! y min-y))
+                ((< y min-y) (set! y max-y)))
+          (set! moving #t))
+         (else
+          (set! moving #f)))
+
+    (assoc-set! s 'x x)
+    (assoc-set! s 'y y)
+    `((x . ,x) (y . ,y) (angle . ,angle) (moving . ,moving))))
+
+(define (ship-shot s)
+  (cond ((key-pressed? 'space)
+        `((x . ,(assoc-ref s 'x)) (y . ,(assoc-ref s 'y)) (angle . ,(assoc-ref s 'angle))))
+       (else
+        #f)))
+
+(define (draw-shot sh)
+  (to-origin)
+  (translate (assoc-ref sh 'x) (assoc-ref sh 'y))
+  (rotate (assoc-ref sh 'angle))
+  (draw-line 10))
+
+(define (move-shots shots)
+  (cond ((null? shots) '())
+       (else
+        (let* ((sh (car shots))
+               (x (assoc-ref sh 'x)) (y (assoc-ref sh 'y))
+               (angle (assoc-ref sh 'angle))
+               (r (degrees-to-radians (- angle))))
+          (set! x (+ x (* 10 (sin r))))
+          (set! y (+ y (* 10 (cos r))))
+          (cond ((and (<= x max-x)
+                      (>= x min-x)
+                      (<= y max-y)
+                      (>= y min-y))
+                 (cons `((x . ,x) (y . ,y) (angle . ,angle))
+                       (move-shots (cdr shots))))
+                (else
+                 (move-shots (cdr shots))))))))
+  
+(define (make-asteroids n)
+  (define (xy n r)
+    (let ((n2 (- (random (* n 2)) n)))
+      (cond ((and (< n2 r) (>= n2 0)) r)
+           ((and (> n2 (- r)) (< n2 0)) (- r))
+           (else n2))))
+
+  (cond ((= n 0) '())
+       (else
+        (cons `((x . ,(xy max-x 20)) (y . ,(xy max-y 20)) (angle . 0) (vx . 1) (vy . 1)) (make-asteroids (- n 1))))))
+
+(define (killed-ship? ship asteroids)
+  #f)
+
+(let ((asteroids #f) (ship #f) (shots #f))
+  (define (new-game n)
+    (set! asteroids (make-asteroids n))
+    (set! ship '((x . 0) (y . 0) (angle . 0) (moving . #f)))
+    (set! shots '()))
+
+  (new-game 2)
 
-(let ((asteroids '((100 100 1 1) (-100 -100 -1 1)))
-      (ship '(0 0 0 0 0)))
   (run-game
+   (cond ((killed-ship? ship asteroids)
+         (new-game 2)))
    (set! asteroids (map move-asteroid asteroids))
    (set! ship (move-ship ship))
+   (let ((shot (ship-shot ship)))
+     (cond (shot
+           (set! shots (cons shot shots)))))
+   (set! shots (move-shots shots))
    (for-each draw-asteroid asteroids)
+   (for-each draw-shot shots)
    (draw-ship ship)))