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;;; Copyright (C) 2025 Gene Pasquet
;;;
;;; 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 <https://www.gnu.org/licenses/>.
(import utils [sub-points distance Direction])
;; Define systems here
(setv GRAVITY 5)
(defclass GoalHit [Exception])
(defn entities-by-type [entities types]
(gfor ent entities
:if (in ent.type types)
ent))
(defmacro defsystem [name pred #* body]
`(defn ~name [entity entities]
(when ~pred
~@body)))
(defsystem apply-gravity
(not entity.fixed)
(.move entity #(0 GRAVITY)))
(defsystem apply-collisions
(not entity.fixed)
(for [ent (gfor enti entities
:if (!= enti.id entity.id)
enti)]
(when (.colliderect entity.rect ent.rect)
(if (= ent.type "goal")
(raise (GoalHit))
(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))))
(defsystem run-enemies
(= entity.type "enemy")
;; If the player is on the tile next to the enemy, attack.
(let [player (next (entities-by-type entities ["player"]))
delta (sub-points entity.pos player.pos)
dist (distance entity.pos player.pos)
direction (.x-from-move Direction delta)]
;; If facing the player and within reach, attack)
(when (and (= direction entity.facing)
(< (get delta 1) 1) ;; Same level
(< (abs (get delta 0)) 2)
(not entity.attacking))
(.attack entity))
;; If not facing the player, turn to face
(when (and (< dist 5)
(!= direction entity.facing))
(.move entity #((if (< (get delta 0) 0) -1 1) 0)))
))
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