X-Git-Url: https://git.jsancho.org/?a=blobdiff_plain;f=src%2Fwidgets%2Ftimer.scm;fp=src%2Fwidgets%2Ftimer.scm;h=39899f70d3c7ef6ea9c21735545d1331e956bc27;hb=a3bf97e36510439b714ac53543491f7955497f3d;hp=0000000000000000000000000000000000000000;hpb=905abebe9a3b80a9ae2723024c6df8a728076157;p=gacela.git

diff --git a/src/widgets/timer.scm b/src/widgets/timer.scm
new file mode 100755
index 0000000..39899f7
--- /dev/null
+++ b/src/widgets/timer.scm
@@ -0,0 +1,74 @@
+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2009 by Javier Sancho Fernandez <jsf at jsancho dot org>
+;;;
+;;; This program is free software: you can redistribute it and/or modify
+;;; it under the terms of the GNU General Public License as published by
+;;; the Free Software Foundation, either version 3 of the License, or
+;;; (at your option) any later version.
+;;;
+;;; This program is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;;; GNU General Public License for more details.
+;;;
+;;; You should have received a copy of the GNU General Public License
+;;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+
+(define-module (gacela widgets timer)
+  #:use-module (gacela sdl)
+  #:export (make-timer
+	    start-timer
+	    stop-timer
+	    get-time
+	    get-state
+	    pause-timer
+	    resume-timer))
+
+
+(define (make-timer)
+  (let ((start 0) (paused 0) (state 'stopped))
+    (lambda (op)
+      (case op
+	((start-timer)
+	 (set! start (SDL_GetTicks))
+	 (set! state 'running))
+
+	((stop-timer)
+	 (set! state 'stopped))
+
+	((get-time)
+	 (cond ((eq? state 'stopped) 0)
+	       ((eq? state 'paused) paused)
+	       (else (- (SDL_GetTicks) start))))
+
+	((get-state)
+	 state)
+
+	((pause-timer)
+	 (cond ((eq? state 'running)
+		(set! paused (- (SDL_GetTicks) start))
+		(set! state 'paused))))
+
+	((resume-timer)
+	 (cond ((eq? state 'paused)
+		(set! start (- (SDL_GetTicks) paused))
+		(set! state 'running))))))))
+
+(define (start-timer timer)
+  (timer 'start-timer))
+
+(define (stop-timer timer)
+  (timer 'stop-timer))
+
+(define (get-time timer)
+  (timer 'get-time))
+
+(define (get-state timer)
+  (timer 'get-state))
+
+(define (pause-timer timer)
+  (timer 'pause-timer))
+
+(define (resume-timer timer)
+  (timer 'resume-timer))