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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) (* (modulo n 17) (/ time 8)))
(+ (/ (sin (* n n)) 7) pi/2)))
(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-interval 2
#:emit-count 16
#:life-span 60
#:renderer (make-simple-particle-renderer
particle-position))))
(define-signal batch
(on-start (make-sprite-batch 4096)))
(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 320 180)
(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:
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