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(module entity
*
(import scheme
(chicken base)
(chicken keyword)
(only srfi-1 fold))
;; Entities = plists with shared keys (#:type, #:x, #:y, #:width, #:height, ...).
(define (entity-ref entity key #!optional default)
(get-keyword key entity (if (procedure? default) default (lambda () default))))
(define (entity-type entity)
(entity-ref entity #:type #f))
(define (entity-set entity key val)
(let ((cleaned (let loop ((lst entity) (acc '()))
(if (null? lst)
(reverse acc)
(let ((k (car lst))
(v (cadr lst)))
(if (eq? k key)
(loop (cddr lst) acc)
(loop (cddr lst) (cons v (cons k acc)))))))))
(cons key (cons val cleaned))))
(define (entity-update entity key proc #!optional default)
(entity-set entity key (proc (entity-ref entity key default))))
(define (make-player-entity x y width height)
(list #:type 'player
#:x x
#:y y
#:width width
#:height height
#:vx 0
#:vy 0
#:gravity? #t
#:on-ground? #f
#:tile-id 29
#:input-map '((left . (-2 . 0))
(right . ( 2 . 0))
(down . ( 0 . 2)))))
)
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