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

diff --git a/games/asteroids/asteroids.scm b/games/asteroids/asteroids.scm
index 283333fbd89f698a1e390babd2b5c2daa67bbbd4..c36ae0569b90ab23f200a7cedd41834960b44d76 100644 (file)
--- a/games/asteroids/asteroids.scm
+++ b/games/asteroids/asteroids.scm
@@ -9,21 +9,22 @@
   (let ((asteroid (load-texture "Asteroid.png")))
     (lambda (a)
       (to-origin)
-      (translate (car a) (cadr a))
-      (rotate (caddr 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))
-        (angle (caddr a))
-        (vx (cadddr a)) (vy (cadddr (cdr 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)))
-    (set! angle (+ angle 1))
-    (list (+ x vx) (+ y vy) angle 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-multiple-set! a 'x x 'y y 'angle (+ angle 1) 'vx vx 'vy vy)))
 
 (define draw-ship
   (let ((ship1 (load-texture "Ship1.png"))
@@ -45,11 +46,46 @@
           (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)))
-    `((x . ,x) (y . ,y) (angle . ,angle) (moving . ,moving))))
 
+    (assoc-multiple-set! s '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)))
@@ -59,12 +95,40 @@
 
   (cond ((= n 0) '())
        (else
-        (cons (list (xy max-x 20) (xy max-y 20) 0 1 1) (make-asteroids (- n 1))))))
+        (cons `((x . ,(xy max-x 20)) (y . ,(xy max-y 20)) (angle . 0) (vx . 1) (vy . 1) (size . 95))
+              (make-asteroids (- n 1))))))
+
+(define (killed-ship? s a)
+  (cond ((null? a) #f)
+       (else
+        (or (< (sqrt (+ (expt (- (assoc-ref s 'x) (assoc-ref (car a) 'x)) 2)
+                        (expt (- (assoc-ref s 'y) (assoc-ref (car a) 'y)) 2)))
+               (assoc-ref (car a) 'size))
+            (killed-ship? s (cdr a))))))
+
+(define (kill-asteroids s a)
+  (cond ((or (null? s) (null? a)) (values s a))
+       (else
+        (let ((s1 (car s)) (a1 (car a)))
+          (cond ((or (< (sqrt (+ (expt (- (assoc-ref 
+
+(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 (make-asteroids 2))
-      (ship '((x . 0) (y . 0) (angle . 0) (moving . #f))))
   (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)))