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(import scheme
(chicken base)
(chicken process-context)
(only (list-utils alist) plist->alist)
(prefix sdl2 "sdl2:")
(prefix sdl2-ttf "ttf:")
(prefix sdl2-image "img:")
downstroke-engine
downstroke-world
downstroke-input
downstroke-physics
downstroke-assets
downstroke-entity
downstroke-sound
downstroke-scene-loader)
(define +debug?+ (and (member "--debug" (command-line-arguments)) #t))
(define (make-player)
(plist->alist (list #:type 'player
#:x 100 #:y 50
#:width 16 #:height 16
#:vx 0 #:vy 0
#:gravity? #t #:on-ground? #f
#:tile-id 1 #:tags '(player))))
(define (player-vx input)
(cond ((input-held? input 'left) -3)
((input-held? input 'right) 3)
(else 0)))
(define (update-player player input)
(let* ((jump? (and (input-pressed? input 'a)
(entity-ref player #:on-ground? #f)))
(player (entity-set player #:vx (player-vx input))))
(when jump? (play-sound 'jump))
(if jump?
(entity-set player #:ay (- *jump-force*))
player)))
(define *game*
(make-game
title: "Demo: Platformer" width: 600 height: 400
debug?: +debug?+
preload: (lambda (game)
(init-audio!)
(load-sounds! '((jump . "demo/assets/jump.wav"))))
create: (lambda (game)
(let* ((s0 (game-load-scene! game "demo/assets/level-0.tmx"))
(s1 (scene-add-entity s0 (make-player)))
(s2 (update-scene s1 camera-target: 'player)))
(game-scene-set! game s2)))
update: (lambda (game dt)
(let* ((input (game-input game))
(scene (game-scene game))
(player (update-player (car (scene-entities scene)) input)))
(game-scene-set! game
(update-scene scene entities: (list player)))))))
(game-run! *game*)
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