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;;; Chickadee Game Toolkit
;;; Copyright © 2017 David Thompson <davet@gnu.org>
;;;
;;; Chickadee 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.
;;;
;;; Chickadee 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/>.
(define-module (chickadee scripting)
#:use-module (chickadee scripting agenda)
#:use-module (chickadee scripting channel)
#:use-module (chickadee scripting coroutine)
#:export (forever
wait
tween))
;; Export public bindings from other modules.
(eval-when (eval load compile)
(begin
(define %public-modules
'(agenda channel coroutine))
(for-each (let ((i (module-public-interface (current-module))))
(lambda (m)
(module-use! i (resolve-interface
`(chickadee scripting ,m)))))
%public-modules)))
(define-syntax-rule (forever body ...)
"Evaluate BODY in an endless loop."
(while #t body ...))
(define (wait duration)
"Wait DURATION before resuming the current coroutine."
(yield (lambda (cont) (schedule-after duration cont))))
(define (tween duration start end ease proc)
(let loop ((t 0))
(if (= t duration)
(proc end)
(let ((alpha (/ t duration)))
(proc (+ (* start (- 1 alpha))
(* end alpha)))
(wait 1)
(loop (1+ t))))))
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