More keyboard events

[gacela.git] / examples / 03-key-presses / 03-key-presses.scm

diff --git a/examples/03-key-presses/03-key-presses.scm b/examples/03-key-presses/03-key-presses.scm
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+++ b/examples/03-key-presses/03-key-presses.scm
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+#!/usr/bin/env guile
+!#
+
+;;; Gacela, a GNU Guile extension for fast games development
+;;; Copyright (C) 2017 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/>.
+
+(use-modules (gacela))
+
+
+(define get-pressed-scene #f)
+
+(set! get-pressed-scene
+  (let* ((up (bitmap "up.bmp"))
+        (down (bitmap "down.bmp"))
+        (left (bitmap "left.bmp"))
+        (right (bitmap "right.bmp"))
+        (press (bitmap "press.bmp"))
+        (actived press))
+    (lambda ()
+      (if (any-key-down?)
+         (cond ((key-down? 'up)
+                (set! actived up))
+               ((key-down? 'down)
+                (set! actived down))
+               ((key-down? 'left)
+                (set! actived left))
+               ((key-down? 'right)
+                (set! actived right))
+               (else
+                (set! actived press))))
+      actived)))
+
+(define press (bitmap "press.bmp"))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (lambda ()
+     (display-scene (get-pressed-scene)))))