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(import srfi-64)
(include "entity.scm")
(include "world.scm")
(include "animation.scm")
(import downstroke/entity downstroke/world downstroke/animation)
(test-begin "animation")
(test-group "frame->tile-id"
(test-equal "first frame, frames (0)" 1 (frame->tile-id '(0) 0))
(test-equal "wraps around" 1 (frame->tile-id '(0 1) 2))
(test-equal "frame 1 of (27 28)" 29 (frame->tile-id '(27 28) 1)))
(test-group "set-animation"
(let ((entity (list #:type 'player #:anim-name 'idle #:anim-frame 5 #:anim-tick 8)))
(test-equal "no-op if already active" entity (set-animation entity 'idle))
(let ((switched (set-animation entity 'walk)))
(test-equal "switches anim-name" 'walk (entity-ref switched #:anim-name))
(test-equal "resets frame" 0 (entity-ref switched #:anim-frame))
(test-equal "resets tick" 0 (entity-ref switched #:anim-tick)))))
(test-group "animate-entity"
(let* ((anims '((walk . (#:frames (0 1) #:duration 4))))
(entity (list #:type 'player #:anim-name 'walk #:anim-frame 0 #:anim-tick 0))
(stepped (animate-entity entity anims)))
(test-equal "increments tick" 1 (entity-ref stepped #:anim-tick))
(test-equal "sets tile-id on first tick" 1 (entity-ref stepped #:tile-id)))
(let* ((anims '((walk . (#:frames (0 1) #:duration 2))))
(entity (list #:type 'player #:anim-name 'walk #:anim-frame 0 #:anim-tick 1))
(advanced (animate-entity entity anims)))
(test-equal "advances frame when tick reaches duration" 1 (entity-ref advanced #:anim-frame))
(test-equal "resets tick on frame advance" 0 (entity-ref advanced #:anim-tick)))
(let* ((entity (list #:type 'player)))
(test-equal "unchanged entity without anim-name" entity (animate-entity entity '()))))
(test-end "animation")
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