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|
(module tilemap
*
(import scheme
(chicken io)
(chicken base)
(chicken string)
(chicken format)
(chicken process-context)
(chicken pathname)
(chicken pretty-print)
(srfi 1)
matchable
expat
defstruct
(prefix sdl2-image "img:")
(prefix sdl2 "sdl2:"))
(+ 1 1)
(defstruct tileset
tilewidth
tileheight
spacing
tilecount
columns
image-source
image)
(+ 1 1)
(defstruct layer
name
width
height
map)
(defstruct object
name
type
x
y
width
height
properties)
(defstruct tilemap
width
height
tilewidth
tileheight
tileset-source
tileset
layers
objects)
(defstruct tile
id
rect)
(define (maybe-do action)
(lambda (value)
(if (eq? value #f)
#f
(action value))))
(define (attempt action)
(lambda (value)
(or (action value) value)))
(define maybe-string->number (maybe-do (attempt string->number)))
(define (string-alist->alist string-alist)
(map (lambda (pair) (cons (string->symbol (car pair))
(maybe-string->number (cdr pair))))
string-alist))
(define (parse-tileset string-tileset)
(let ((parser (expat:make-parser))
(tags '())
(tileset (make-tileset 0 0 0 0 0 "")))
(expat:set-start-handler! parser
(lambda (tag attrs)
(let ((symbol-attrs (string-alist->alist attrs)))
(match tag
("tileset" (set! tileset (alist->tileset symbol-attrs)))
("image" (tileset-image-source-set! tileset (alist-ref 'source symbol-attrs)))
(_ #f)))
(set! tags (cons tag tags))))
(expat:set-end-handler! parser (lambda (tag)
(set! tags (cdr tags))))
(expat:set-character-data-handler! parser (lambda (line) #f))
(expat:parse parser string-tileset)
tileset))
(define (load-tileset file-name)
(call-with-input-file file-name
(lambda (port)
(let* ((tileset (parse-tileset (read-string #f port)))
(image-source (tileset-image-source tileset))
(base-path (pathname-directory file-name))
(img-to-load (if (absolute-pathname? image-source)
image-source
(pathname-replace-directory
image-source
(if (pathname-directory image-source)
(format "~a/~a" base-path (pathname-directory image-source))
base-path)))))
(tileset-image-set! tileset (img:load img-to-load))
tileset))))
(define (parse-tilemap string-tilemap)
(let ((parser (expat:make-parser))
(tags '())
(tilemap (make-tilemap 0 0 0 0 '() '() '()))
(layer '())
(object '()))
(expat:set-start-handler!
parser
(lambda (tag attrs)
(let ((symbol-attrs (string-alist->alist attrs)))
(match tag
("map"
(tilemap-width-set! tilemap (alist-ref 'width symbol-attrs))
(tilemap-height-set! tilemap (alist-ref 'height symbol-attrs))
(tilemap-tilewidth-set! tilemap (alist-ref 'tilewidth symbol-attrs))
(tilemap-tileheight-set! tilemap (alist-ref 'tileheight symbol-attrs)))
("tileset"
(tilemap-tileset-source-set! tilemap (alist-ref 'source symbol-attrs)))
("layer"
(set! layer (alist->layer attrs)))
("object"
(set! object (alist->object symbol-attrs)))
("property"
(object-properties-set!
object
(cons (cons (alist-ref 'name symbol-attrs) (alist-ref 'value symbol-attrs))
(or (object-properties object) '()))))
(_ #f))
(set! tags (cons tag tags)))))
(expat:set-end-handler!
parser
(lambda (tag)
(match tag
("layer" (begin
(tilemap-layers-set! tilemap
(cons layer (tilemap-layers tilemap)))
(set! layer '())))
("object" (tilemap-objects-set! tilemap (cons object (tilemap-objects tilemap))))
(_ #f))
(set! tags (cdr tags))))
(expat:set-character-data-handler!
parser
(lambda (line)
(when (string=? (car tags) "data")
(let ((txt (string-chomp line)))
(when (not (string=? txt ""))
(layer-map-set! layer (append
(or (layer-map layer) '())
(list (map string->number
(string-split txt ","))))))))))
(expat:parse parser string-tilemap)
tilemap))
(define (tileset-rows tileset)
"Return the number of rows in the tileset"
(inexact->exact (ceiling (/ (tileset-tilecount tileset) (tileset-columns tileset)))))
(define (tileset-tile tileset tile-id)
;; Use the tileset's columns setting and the tileheight/tilewidth to
;; find the tile's x,y location and create a rect
(let* ((tile-num (- tile-id 1)) ; tile-id starts at 1!
(tile-width (tileset-tilewidth tileset))
(tile-height (tileset-tileheight tileset))
(tile-x (modulo tile-num (tileset-columns tileset)))
(tile-y (inexact->exact (floor (/ tile-num (tileset-columns tileset)))))
(x (+ (* tile-x tile-width) tile-x))
(y (+ (* tile-y tile-height) tile-y)))
(make-tile
id: tile-id
rect: (sdl2:make-rect x y tile-width tile-height))))
(define (load-tilemap file-name)
(call-with-input-file file-name
(lambda (port)
(let* ((tilemap (parse-tilemap (read-string #f port)))
(base-path (pathname-directory file-name))
(tileset-source (tilemap-tileset-source tilemap)))
(tilemap-tileset-set! tilemap (load-tileset
(if (absolute-pathname? tileset-source)
tileset-source
(pathname-replace-directory
tileset-source
(if (pathname-directory tileset-source)
(format "~a/~a" base-path (pathname-directory tileset-source))
base-path))
)))
tilemap))))
(when #f
(let ((txt "<?xml version='1.0' encoding='UTF-8'?>
<tileset version='1.10' tiledversion='1.11.2' name='monochrome_transparent' tilewidth='16' tileheight='16' spacing='1' tilecount='1078' columns='49'>
<image source='monochrome-transparent.png' width='832' height='373'/>
</tileset>
"))
(tileset-image (parse-tileset txt)))
(let ((txt "<?xml version='1.0' encoding='UTF-8'?>
<map version='1.10' tiledversion='1.11.0' orientation='orthogonal' renderorder='right-down' width='40' height='30' tilewidth='16' tileheight='16' infinite='0' nextlayerid='8' nextobjectid='5'>
<tileset firstgid='1' source='monochrome_transparent.tsx'/>
<layer id='3' name='ground' width='40' height='30'>
<data encoding='csv'>
0,0,0,0,168,169,0,0,0,0,
844,0,0,0,0,0,845,546,546,546,
</data>
</layer>
<objectgroup id='7' name='entities'>
<object id='2' name='player' type='Player' gid='29' x='182' y='350.5' width='16' height='16'/>
<object id='3' name='hint' type='Text' x='98.5' y='432.5' width='197' height='78'>
<properties>
<property name='text' value='hit enter to start a macro'/>
</properties>
</object>
<object id='4' name='goal' type='Goal' x='560.935' y='288.641' width='16' height='16'/>
</objectgroup>
</map>
"))
(tilemap-tileset (parse-tilemap txt)))
(tileset-image (tilemap-tileset (load-tilemap "assets/level-0.tmx")))
)
) ;; End tilemap module
|
