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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 bullets)
#:use-module (sly records)
#:use-module (sly math rect)
#:use-module (sly math vector)
#:use-module (lisparuga utils)
#:export (%bullet-bounds
make-bullet
bullet?
bullet-type
bullet-polarity
bullet-live?
bullet-position
bullet-direction
bullet-hitbox
kill-bullet
move-bullet
move-bullet-to
bullet-in-bounds?
forward
bullet-world-hitbox))
(define %bullet-bounds (rect-inflate bounds 32 32))
(define-record-type* <bullet>
%make-bullet make-bullet
bullet?
(type bullet-type 'generic)
(polarity bullet-polarity 'light)
(live? bullet-live? #t)
(position bullet-position origin2)
(direction bullet-direction 0)
(hitbox bullet-hitbox (make-rect -1 -1 1 1)))
(define (kill-bullet bullet)
(make-bullet #:inherit bullet #:live? #f))
(define (move-bullet bullet offset)
(make-bullet #:inherit bullet
#:position (v+ (bullet-position bullet) offset)))
(define (move-bullet-to bullet position)
(make-bullet #:inherit bullet #:position position))
(define (bullet-in-bounds? bullet)
(rect-contains? %bullet-bounds (bullet-position bullet)))
(define (forward speed)
(lambda (world effects bullet)
(values #f
effects
(move-bullet bullet
(polar2 speed (bullet-direction bullet))))))
(define (bullet-world-hitbox bullet)
(rect-move (bullet-hitbox bullet) (bullet-position bullet)))
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