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;;; Lisparuga
;;; Copyright © 2016 David Thompson <davet@gnu.org>
;;;
;;; Lisparuga 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.
;;;
;;; Lisparuga 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 Lisparuga. If not, see <http://www.gnu.org/licenses/>.
(define-module (lisparuga enemies)
#:use-module (sly records)
#:use-module (sly math rect)
#:use-module (sly math vector)
#:use-module (lisparuga bullets)
#:use-module (lisparuga player)
#:use-module (lisparuga utils)
#:export (make-enemy
enemy?
enemy-position
enemy-aim
enemy-type
enemy-polarity
enemy-hitbox
enemy-last-hit-time
enemy-health
enemy-dead?
enemy-alive?
damage-enemy
place-enemy
move-enemy
aim-enemy
enemy-world-hitbox))
(define-record-type* <enemy>
%make-enemy make-enemy
enemy?
(position enemy-position origin2)
(aim enemy-aim 0) ; angle for firing bullets
;; TODO: We could leave out the '-light' part and use the polarity
;; field to figure things out, but it's more work so forget it.
(type enemy-type 'pincer-dark)
(polarity enemy-polarity 'light)
(hitbox enemy-hitbox (make-rect -5 -5 10 10))
(last-hit-time enemy-last-hit-time #f)
(health enemy-health 0))
(define (enemy-dead? enemy)
(zero? (enemy-health enemy)))
(define (enemy-alive? enemy)
(> (enemy-health enemy) 0))
(define (damage-enemy enemy bullet time)
(make-enemy #:inherit enemy
#:last-hit-time time
#:health (max 0
(- (enemy-health enemy)
(if (eq? (enemy-polarity enemy)
(bullet-polarity bullet))
%player-attack
;; Bullets of opposite polarity
;; deal double damage.
(* %player-attack 2))))))
(define (place-enemy enemy position)
(make-enemy #:inherit enemy
#:position position))
(define (move-enemy enemy offset)
(make-enemy #:inherit enemy
#:position (v+ (enemy-position enemy) offset)))
(define (aim-enemy enemy offset)
(make-enemy #:inherit enemy
#:aim (+ (enemy-aim enemy) offset)))
(define (enemy-world-hitbox enemy)
(rect-move (enemy-hitbox enemy) (enemy-position enemy)))
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