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;;; Copyright © 2022 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/>.
(define-module (apple-town-fair common)
#:use-module (apple-town-fair config)
#:use-module (chickadee)
#:use-module (chickadee graphics color)
#:use-module (chickadee graphics path)
#:use-module (chickadee math vector)
#:use-module (chickadee scripting)
#:use-module (oop goops)
#:use-module (catbird scene)
#:use-module (catbird node)
#:use-module (catbird node-2d)
#:export (steps
full-screen-rectangle
fade-in
fade-out))
(define (steps n)
(* n (current-timestep)))
(define (full-screen-rectangle color)
(with-style ((fill-color color))
(fill
(rectangle (vec2 0.0 0.0) %game-width %game-height))))
(define (black-alpha alpha)
(make-color 0.0 0.0 0.0 alpha))
(define (fade scene start-alpha end-alpha duration)
(let ((bg (make <canvas>
#:rank 999
#:painter (full-screen-rectangle
(black-alpha start-alpha)))))
(attach-to scene bg)
(tween duration start-alpha end-alpha
(lambda (a)
(set! (painter bg)
(full-screen-rectangle
(black-alpha a)))))
(detach bg)))
(define-method (fade-in (scene <scene>) duration)
(fade scene 1.0 0.0 duration))
(define-method (fade-out (scene <scene>) duration)
(fade scene 0.0 1.0 duration))
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