1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
|
(module downstroke-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 (alist->tileset attrs)
(make-tileset
tilewidth: (alist-ref 'tilewidth attrs eq?)
tileheight: (alist-ref 'tileheight attrs eq?)
spacing: (alist-ref 'spacing attrs eq? 0)
tilecount: (alist-ref 'tilecount attrs eq?)
columns: (alist-ref 'columns attrs eq?)
image-source: ""
image: #f))
(define (alist->layer attrs)
(let ((symbol-attrs (string-alist->alist attrs)))
(make-layer
name: (alist-ref 'name symbol-attrs eq?)
width: (alist-ref 'width symbol-attrs eq?)
height: (alist-ref 'height symbol-attrs eq?)
map: '())))
(define (alist->object attrs)
(make-object
name: (alist-ref 'name attrs eq?)
type: (alist-ref 'type attrs eq?)
x: (alist-ref 'x attrs eq?)
y: (alist-ref 'y attrs eq?)
width: (alist-ref 'width attrs eq? 0)
height: (alist-ref 'height attrs eq? 0)
properties: '()))
(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 width: 0 height: 0 tilewidth: 0 tileheight: 0
tileset-source: "" tileset: #f
layers: '() objects: '()))
(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 (string->symbol (alist-ref "name" attrs string=?))
(alist-ref "value" attrs string=?))
(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
|
