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;;; Sly
;;; Copyright (C) 2013, 2014 David Thompson <dthompson2@worcester.edu>
;;;
;;; 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 (srfi srfi-43)
(sly utils)
(sly game)
(sly window)
(sly signal)
(sly math)
(sly math rect)
((sly math transform) #:prefix t:)
(sly math tween)
(sly math vector)
(sly render)
(sly render camera)
(sly render sprite)
(sly render tileset))
(load "common.scm")
(define sprite* (memoize make-sprite))
(define move* (memoize move))
(define (make-walk-cycle tiles)
(list->vector
(map (lambda (id)
(sprite* (tileset-ref tiles id)))
'(19 20 21 22 23 24 25 26))))
(define position-tween
(tween vlerp (compose ease-linear ease-loop)
(vector2 640 240) (vector2 0 240) 90))
(define (make-frame-tween walk-cycle)
(if (vector-empty? walk-cycle)
(const 0)
(let* ((frame-count (vector-length walk-cycle))
(frame-rate (/ 60 frame-count)))
(tween (compose floor lerp) (compose ease-linear ease-loop)
0 frame-count (* frame-count frame-rate)))))
(define camera (2d-camera #:area (make-rect 0 0 640 480)))
(define (move/interpolate new old renderer)
(lambda (gfx)
(graphics-model-view-excursion gfx
(lambda (gfx)
(let ((v (vlerp old new (graphics-alpha gfx))))
(graphics-model-view-mul! gfx (t:translate v))
(renderer gfx))))))
(define (render time walk-cycle frame-tween)
(let* ((frame (vector-ref walk-cycle (frame-tween time))))
(with-camera camera
(move/interpolate (position-tween time)
(position-tween (1- time))
(render-sprite frame)))))
(define-signal walk-cycle
(signal-map-maybe make-walk-cycle
(on-start (load-tileset "images/princess.png" 64 64))))
(define-signal time (signal-timer))
(define-signal frame-tween
(signal-map-maybe make-frame-tween walk-cycle))
(define-signal scene
(signal-map (lambda (render)
(or render render-nothing))
(signal-map-maybe render time walk-cycle frame-tween)))
(with-window (make-window #:title "Animation")
(run-game-loop scene))
;;; Local Variables:
;;; compile-command: "../pre-inst-env guile animation.scm"
;;; End:
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