1 files changed, 59 insertions, 0 deletions
diff --git a/examples/particles.scm b/examples/particles.scm
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+++ b/examples/particles.scm
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+;;; Sly
+;;; Copyright (C) 2016 David Thompson <davet@gnu.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 (sly)
+             (sly render particles)
+             (sly render sprite-batch)
+             (sly render utils))
+
+(load "common.scm")
+
+(define (particle-position n time life-span)
+  (polar2 (* time 2) (* n n)))
+
+(define-signal texture
+  (on-start (load-texture "images/bullet.png")
+            null-texture))
+
+(define-signal particle-system
+  (signal-let ((texture texture))
+    (make-particle-system #:texture texture
+                          #:emit-rate 4
+                          #:life-span 200
+                          #:renderer (make-simple-particle-renderer
+                                      particle-position))))
+
+(define-signal batch
+  (on-start (make-sprite-batch 1024)))
+
+(define-signal scene
+  (signal-let ((particle-system particle-system)
+               (batch batch)
+               (time (signal-timer)))
+    (if batch
+        (with-camera (2d-camera #:area (make-rect 0 0 640 480))
+          (with-blend-mode (make-blend-mode 'src-alpha 'one)
+            (move (vector2 320 240)
+                  (render-particles particle-system batch time))))
+        render-nothing)))
+
+(with-window (make-window #:title "Particles")
+  (run-game-loop scene))
+
+;;; Local Variables:
+;;; compile-command: "../pre-inst-env guile particles.scm"
+;;; End: