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(define-module (catbird mixins)
#:use-module (catbird config)
#:use-module (chickadee math vector)
#:use-module (chickadee scripting)
#:use-module (ice-9 exceptions)
#:use-module (oop goops)
#:use-module (srfi srfi-9)
#:export (<nameable>
name
<rankable>
rank
sort-by-rank/ascending
<containable>
parent
attach
detach
on-enter
on-exit
on-attach
on-detach
<updatable>
update
update/around
<scriptable>
agenda
on-pause
on-resume
paused?
pause
resume
run-script
stop-scripts
<renderable>
visible?
on-show
on-hide
show
hide
render
render/around
render/before
<movable-2d>
<movable-3d>
position)
#:replace (pause))
(define-class <nameable> ()
(name #:accessor name #:init-keyword #:name #:init-value #f))
;; For Z sorting objects and such.
(define-class <rankable> ()
(rank #:accessor rank #:init-keyword #:rank #:init-value 0))
(define (sort-by-rank/ascending lst)
(sort lst
(lambda (a b)
(< (rank a) (rank b)))))
;;;
;;; Containable
;;;
(define-class <containable> ()
(parent #:accessor parent #:init-form #f))
(define-method (on-enter (child <containable>))
#t)
(define-method (on-exit (child <containable>))
#t)
(define-method (on-attach parent (child <containable>))
#t)
(define-method (on-detach parent (child <containable>))
#t)
(define-method (attach (obj <containable>) container)
(when (parent obj)
(raise-exception
(make-exception-with-message "object already has a parent")))
(set! (parent obj) container)
(on-enter obj)
(on-attach container obj))
(define-method (detach (obj <containable>))
(unless (parent obj)
(raise-exception
(make-exception-with-message "object has no parent")))
(on-detach (parent obj) obj)
(on-exit obj)
(set! (parent obj) #f))
;;;
;;; Updatable
;;;
(define-class <updatable> ())
(define-method (update (obj <updatable>) dt)
#t)
(define-method (update/around (obj <updatable>) dt)
(update obj dt))
;;;
;;; Scriptable
;;;
(define-class <scriptable> (<updatable>)
(paused? #:accessor paused? #:init-form #f #:init-keyword #:paused?)
(agenda #:getter agenda #:init-thunk make-agenda))
(define-method (on-pause (obj <scriptable>))
#t)
(define-method (on-resume (obj <scriptable>))
#t)
(define-method (pause (obj <scriptable>))
(unless (paused? obj)
(set! (paused? obj) #t)
(on-pause obj)))
(define-method (resume (obj <scriptable>))
(when (paused? obj)
(set! (paused? obj) #f)
(on-resume obj)))
(define-method (update/around (obj <scriptable>) dt)
(unless (paused? obj)
(with-agenda (agenda obj)
(update-agenda dt)
(next-method))))
(define-syntax-rule (run-script obj body ...)
(with-agenda (agenda obj) (script body ...)))
(define-method (stop-scripts obj)
(with-agenda (agenda obj) (clear-agenda)))
;;;
;;; Renderable
;;;
(define-class <renderable> ()
(visible? #:accessor visible? #:init-form #t #:init-keyword #:visible?))
(define-method (on-show (obj <renderable>))
#t)
(define-method (on-hide (obj <renderable>))
#t)
(define-method (show (obj <renderable>))
(set! (visible? obj) #t)
(on-show obj))
(define-method (hide (obj <renderable>))
(set! (visible? obj) #f)
(on-hide obj))
(define-method (render (obj <renderable>) alpha)
#t)
(define-method (render/before (obj <renderable>) alpha)
#t)
(define-method (render/around (obj <renderable>) alpha)
(when (visible? obj)
(render/before obj alpha)
(render obj alpha)))
;;;
;;; Movable
;;;
(define-class <movable-2d> ()
(position #:accessor position #:init-keyword #:position
#:init-form (vec2 0.0 0.0)))
(define-class <movable-3d> ()
(position #:accessor position #:init-keyword #:position
#:init-form (vec3 0.0 0.0 0.0)))
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