--- /dev/null
+#!/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)))))
+
+(display-scene
+ (window ((resolution '(640 480)))
+ (move (image "homer.png")
+ wiggle 0)))
+
+(display-scene
+ (window ((resolution '(640 480)))
+ (move (image "marge.png")
+ 0 waggle)))
#:use-module ((sdl2 surface) #:prefix sdl2:)
#:use-module (gl)
#:export (image
- move-xy
+ move
scale))
+(define (calculate proc-or-value)
+ (if (procedure? proc-or-value)
+ (proc-or-value)
+ proc-or-value))
+
(define (image filename)
(make-scene
"image"
(gl-vertex (- w/2) (- h/2) 0))
(gl-disable (oes-framebuffer-object texture-2d))))))
-(define (move-xy x y scene)
- (define (to-integer n)
- (inexact->exact (round n)))
+(define* (move scene x y #:optional (z 0))
(make-scene
- "move-xy"
+ "move"
(lambda ()
- (let ((xy (list (to-integer (if (procedure? x) (x) x))
- (to-integer (if (procedure? y) (y) y)))))
- (display-scene scene #:xy xy)))))
+ (gl-translate (calculate x)
+ (calculate y)
+ (calculate z))
+ (display-scene scene))))
(define* (scale scene x #:optional (y x) (z y))
(make-scene