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;; Define systems here
(setv GRAVITY 5)
(defn apply-gravity [entity entities]
(when (not entity.fixed)
(.move entity #(0 GRAVITY))))
(defn apply-collisions [entity entities]
(when (not entity.fixed)
(for [ent (gfor enti entities :if (!= enti.id entity.id) enti)]
(when (.colliderect entity.rect ent.rect)
(let [collision-rect (.clip entity.rect ent.rect)
move-x (get entity.total-move 0)
move-y (get entity.total-move 1)]
(when (!= move-x 0)
(.move entity #((* (if (> move-x 0) -1 1) collision-rect.width) 0)))
(when (!= move-y 0)
(.move entity #(0 (* (if (> move-y 0) -1 1) collision-rect.height)))))
(.ground entity)))))
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