From cb2786421d0ccb887eccacaafc42ae310535cf3a Mon Sep 17 00:00:00 2001
From: jsancho <devnull@localhost>
Date: Fri, 2 Sep 2011 07:54:51 +0000
Subject: [PATCH]

---
 games/asteroids/asteroids.scm |  6 ++++++
 src/gacela_misc.scm           | 28 ++++++++++++++++++++++------
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/games/asteroids/asteroids.scm b/games/asteroids/asteroids.scm
index d684e07..c36ae05 100644
--- a/games/asteroids/asteroids.scm
+++ b/games/asteroids/asteroids.scm
@@ -106,6 +106,12 @@
 		(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))
diff --git a/src/gacela_misc.scm b/src/gacela_misc.scm
index a9393ca..6dd13b1 100644
--- a/src/gacela_misc.scm
+++ b/src/gacela_misc.scm
@@ -26,6 +26,28 @@
 (define *pi* (* (asin 1) 2))
 
 
+;;; Geometry
+
+(define (degrees-to-radians angle)
+  (/ (* angle *pi*) 180))
+
+(define (radians-to-degrees angle)
+  (/ (* angle 180) *pi*))
+
+(define (distance-between-points p1 p2)
+  (define (add-power-of-two p1 p2)
+    (cond ((null? p1)
+	   0)
+	  (else
+	   (+ (expt (- (car p1) (car p2)) 2)
+	      (add-power-of-two (cdr p1) (cdr p2))))))
+
+  (cond ((not (= (length p1) (length p2)))
+	 #f)
+	(else
+	 (sqrt (add-power-of-two p1 p2)))))
+
+
 ;;; Functions
 
 (define (nearest-power-of-two n)
@@ -34,12 +56,6 @@
 	  (else (power (* p 2) n))))
   (power 1 n))
 
-(define (degrees-to-radians angle)
-  (/ (* angle *pi*) 180))
-
-(define (radians-to-degrees angle)
-  (/ (* angle 180) *pi*))
-
 (define-macro (pushnew elem list)
   `(cond ((not (find (lambda (e) (eq? e ,elem)) ,list))
 	  (set! ,list (cons ,elem ,list)))))
-- 
2.39.2