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Diffstat (limited to 'chickadee/scripting.scm')
-rw-r--r-- | chickadee/scripting.scm | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/chickadee/scripting.scm b/chickadee/scripting.scm new file mode 100644 index 0000000..7a661bb --- /dev/null +++ b/chickadee/scripting.scm @@ -0,0 +1,53 @@ +;;; 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)))))) |