Merge branch 'feature/composition' into develop

[gacela.git] / examples / 06-composition / 06-composition.scm

diff --git a/examples/06-composition/06-composition.scm b/examples/06-composition/06-composition.scm
new file mode 100644 (file)
index 0000000..eeb1130
--- /dev/null
+++ b/examples/06-composition/06-composition.scm
@@ -0,0 +1,59 @@
+#!/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 (tick) (* 3000000 (get-internal-real-time)))
+(define (waggle) (* 200 (cos (* pi (tick)))))
+(define (wiggle) (* 300 (sin (* pi (tick)))))
+(define (swaggle) (cos (* pi (tick))))
+(define (swiggle) (sin (* pi (tick))))
+
+(define homer (image "homer.png"))
+(define marge (image "marge.png"))
+
+(define (hv-dance image1 image2)
+  (over (move image1 wiggle 0)
+        (move image2 0 waggle)))
+
+(define homer-marge-dance
+  (hv-dance homer marge))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   homer-marge-dance))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (let ((small (scale homer-marge-dance 0.5)))
+     (hv-dance small small))))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (scale homer-marge-dance (lambda () (abs (swiggle))))))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (hv-dance (scale homer swiggle)
+             (scale marge swaggle))))
+
+(display-scene
+ (window ((resolution '(640 480)))
+   (over (scale homer swiggle)
+         (move marge wiggle waggle))))