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[gacela.git] / src / gacela_misc.scm

diff --git a/src/gacela_misc.scm b/src/gacela_misc.scm
index d486b2650b734a2bea3ef7b977f42898ad7ef480..9dc10aa6c9140dec198ca4d9079c001c0c55871d 100644 (file)
--- a/src/gacela_misc.scm
+++ b/src/gacela_misc.scm
@@ -15,12 +15,31 @@
 ;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 
+
+;;; Additional modules
+
+(use-modules (srfi srfi-1))
+
+
+;;; Constants
+
+(define *pi* (* (asin 1) 2))
+
+
+;;; Functions
+
 (define (nearest-power-of-two n)
   (define (power p n)
     (cond ((> (* p 2) n) p)
          (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)))))