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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
|
;;; -*- Mode: LISP; Syntax: COMMON-LISP; Package: CL-GD; Base: 10 -*-
;;; $Header: /usr/local/cvsrep/gd/drawing.lisp,v 1.28 2007/01/01 23:41:00 edi Exp $
;;; Copyright (c) 2003-2007, Dr. Edmund Weitz. All rights reserved.
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;; * Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;; * Redistributions in binary form must reproduce the above
;;; copyright notice, this list of conditions and the following
;;; disclaimer in the documentation and/or other materials
;;; provided with the distribution.
;;; THIS SOFTWARE IS PROVIDED BY THE AUTHOR 'AS IS' AND ANY EXPRESSED
;;; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
;;; WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
;;; ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
;;; DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
;;; DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
;;; GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
;;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
;;; WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
(in-package :cl-gd)
(defun get-pixel (x y &key (image *default-image*))
"Gets the color associated with point \(X,Y)."
(check-type image image)
(with-transformed-alternative
((x x-transformer)
(y y-transformer))
(gd-image-get-pixel (img image) x y)))
(defun set-pixel (x y &key (color *default-color*) (image *default-image*))
"Draws a pixel with color COLOR at point \(X,Y)."
(check-type image image)
(with-color-argument
(with-transformed-alternative
((x x-transformer)
(y y-transformer))
(gd-image-set-pixel (img image) x y color)))
(values x y))
(defgeneric set-pixels (points &key color image)
(:documentation "Draws a list \(X1 Y1 X2 Y2 ...) or vector #\(X1 Y1
X2 Y2 ...) of pixels."))
(defmethod set-pixels ((points list) &key (color *default-color*) (image *default-image*))
(check-type image image)
(unless (evenp (length points))
(error "List ~S must have an even number of elements"
points))
(loop with img = (img image)
for (x y) on points by #'cddr do
(check-type x integer)
(check-type y integer)
(with-transformed-alternative
((x x-transformer)
(y y-transformer))
(gd-image-set-pixel img x y color))
finally (return image)))
(defmethod set-pixels ((points vector) &key (color *default-color*) (image *default-image*))
(check-type image image)
(let ((length (length points)))
(unless (evenp length)
(error "List ~S must have an even number of elements"
points))
(loop with img = (img image)
for i below length by 2 do
(check-type (aref points i) integer)
(check-type (aref points (1+ i)) integer)
(with-transformed-alternative
(((aref points i) x-transformer)
((aref points (1+ i)) y-transformer))
(gd-image-set-pixel img
(aref points i)
(aref points (1+ i))
color))
finally (return image))))
(defun draw-line (x1 y1 x2 y2 &key (color *default-color*) (image *default-image*))
"Draws a line with color COLOR from point \(X1,Y1) to point \(X2,Y2)."
(check-type image image)
(with-color-argument
(with-transformed-alternative
((x1 x-transformer)
(y1 y-transformer)
(x2 x-transformer)
(y2 y-transformer))
(gd-image-line (img image) x1 y1 x2 y2 color)))
(values x1 y1 x2 y2))
(defun draw-rectangle* (x1 y1 x2 y2 &key filled (color *default-color*) (image *default-image*))
"Draws a rectangle with upper left corner \(X1,Y1) and lower right
corner \(X2,Y2). If FILLED is true the rectangle will be filled with
COLOR, otherwise it will be outlined."
(check-type image image)
(with-color-argument
(with-transformed-alternative
((x1 x-transformer)
(y1 y-transformer)
(x2 x-transformer)
(y2 y-transformer))
(if filled
(gd-image-filled-rectangle (img image) x1 y1 x2 y2 color)
(gd-image-rectangle (img image) x1 y1 x2 y2 color))))
(values x1 y1 x2 y2))
(defun draw-rectangle (rectangle &key filled (color *default-color*) (image *default-image*))
"Draws a rectangle with upper left corner \(X1,Y1) and lower right
corner \(X2,Y2) where RECTANGLE is the list \(X1 Y1 X2 Y2). If FILLED
is true the rectangle will be filled with COLOR, otherwise it will be
outlined."
(draw-rectangle* (first rectangle)
(second rectangle)
(third rectangle)
(fourth rectangle)
:filled filled
:color color
:image image)
rectangle)
(defgeneric draw-polygon (vertices &key filled start end color image)
(:documentation "Draws a polygon with the VERTICES \(at least three)
specified as a list \(x1 y1 x2 y2 ...) or as a vector #\(x1 y1 x2 y2
...). If FILLED is true the polygon will be filled with COLOR,
otherwise it will be outlined. If START and/or END are specified then
only the corresponding part of VERTICES is used as input."))
(defmethod draw-polygon ((vertices vector) &key filled (start 0) (end (length vertices)) (color *default-color*) (image *default-image*))
(check-type start integer)
(check-type end integer)
(check-type image image)
(let ((effective-length (- end start)))
(unless (and (>= effective-length 6)
(evenp effective-length))
(error "We need an even number of at least six vertices"))
(with-safe-alloc (arr (allocate-foreign-object 'gd-point (/ effective-length 2))
(free-foreign-object arr))
(with-color-argument
(with-transformed-alternative
(((aref vertices i) x-transformer)
((aref vertices (1+ i)) y-transformer))
(loop for i from start below end by 2
for point-ptr = (deref-array arr '(:array gd-point) (/ (- i start) 2))
do (setf (get-slot-value point-ptr 'gd-point 'x)
(aref vertices i)
(get-slot-value point-ptr 'gd-point 'y)
(aref vertices (1+ i))))
(funcall (if filled
#'gd-image-filled-polygon
#'gd-image-polygon)
(img image) arr (/ effective-length 2) color)
vertices)))))
(defmethod draw-polygon ((vertices list) &key filled (start 0) (end (length vertices)) (color *default-color*) (image *default-image*))
(check-type start integer)
(check-type end integer)
(check-type image image)
(let ((effective-length (- end start)))
(unless (and (>= effective-length 6)
(evenp effective-length))
(error "We need an even number of at least six vertices"))
(with-safe-alloc (arr (allocate-foreign-object 'gd-point (/ effective-length 2))
(free-foreign-object arr))
(with-color-argument
(with-transformed-alternative
(((first x/y) x-transformer)
((second x/y) y-transformer))
(loop for i below (- end start) by 2
;; we don't use LOOP's destructuring capabilities here
;; because of your simple WITH-TRANSFORMED-ALTERNATIVE
;; macro which would get confused
for x/y on (nthcdr start vertices) by #'cddr
for point-ptr = (deref-array arr '(:array gd-point) (/ i 2))
do (setf (get-slot-value point-ptr 'gd-point 'x)
(first x/y)
(get-slot-value point-ptr 'gd-point 'y)
(second x/y)))
(funcall (if filled
#'gd-image-filled-polygon
#'gd-image-polygon)
(img image) arr (/ effective-length 2) color)
vertices)))))
(defun draw-filled-ellipse (center-x center-y width height &key (color *default-color*) (image *default-image*))
"Draws a filled ellipse centered at \(CENTER-X, CENTER-Y) with width
WIDTH and height HEIGHT."
(check-type image image)
(with-color-argument
(with-transformed-alternative
((center-x x-transformer)
(center-y y-transformer)
(width w-transformer)
(height h-transformer))
(gd-image-filled-ellipse (img image) center-x center-y width height color)))
(values center-x center-y width height))
(defun draw-filled-circle (center-x center-y radius &key (color *default-color*) (image *default-image*))
"Draws a filled circle centered at \(CENTER-X, CENTER-Y) with radius
RADIUS."
(draw-filled-ellipse center-x center-y (* 2 radius) (* 2 radius)
:color color :image image)
(values center-x center-y radius))
(defun draw-arc (center-x center-y width height start end &key straight-line center-connect filled (color *default-color*) (image *default-image*))
"Draws a partial ellipse centered at \(CENTER-X, CENTER-Y) with
width WIDTH and height HEIGHT. The arc begins at angle START and ends
at angle END. If STRAIGHT-LINE is true the start and end points are
just connected with a straight line. If CENTER-CONNECT is true, they
are connected to the center \(which is useful to create 'pie
slices'). If FILLED is true the arc will be filled with COLOR,
otherwise it will be outlined."
(check-type image image)
(with-color-argument
(with-transformed-alternative
((center-x x-transformer)
(center-y y-transformer)
(width w-transformer)
(height h-transformer)
(start angle-transformer)
(end angle-transformer))
(cond ((not (or straight-line filled center-connect))
(gd-image-arc (img image) center-x center-y width height start end color))
(t
(gd-image-filled-arc (img image) center-x center-y width height start end color
(logior (if straight-line +gd-chord+ 0)
(if filled 0 +gd-no-fill+)
(if center-connect +gd-edged+ 0)))))))
(values center-x center-y width height start end))
(defun fill-image (x y &key border (color *default-color*) (image *default-image*))
"Floods a portion of the image IMAGE with the color COLOR beginning
at point \(X, Y) and extending into the surrounding region. If BORDER
is true it must be a color and the filling will stop at the specified
border color. Otherwise only points with the same color as the
starting point will be colored."
(check-type border (or null integer))
(check-type image image)
(with-color-argument
(with-transformed-alternative
((x x-transformer)
(y y-transformer))
(if border
(gd-image-fill-to-border (img image) x y border color)
(gd-image-fill (img image) x y color))))
(values x y))
(defun clipping-rectangle (&optional (image *default-image*))
"Returns the clipping rectangle of IMAGE as a list of four
elements."
(check-type image image)
(with-transformed-alternative
(((deref-pointer x1p) x-inv-transformer)
((deref-pointer y1p) y-inv-transformer)
((deref-pointer x2p) x-inv-transformer)
((deref-pointer y2p) y-inv-transformer))
(with-foreign-object (x1p :int)
(with-foreign-object (y1p :int)
(with-foreign-object (x2p :int)
(with-foreign-object (y2p :int)
(gd-image-get-clip (img image) x1p y1p x2p y2p)
(list (deref-pointer x1p :int)
(deref-pointer y1p :int)
(deref-pointer x2p :int)
(deref-pointer y2p :int))))))))
(defun (setf clipping-rectangle) (rectangle &optional (image *default-image*))
"Sets the clipping rectangle of IMAGE where rectangle should be a
list \(X1 Y1 X2 Y2)."
(check-type image image)
(with-transformed-alternative
(((first rectangle) x-transformer)
((second rectangle) y-transformer)
((third rectangle) x-transformer)
((fourth rectangle) y-transformer))
(gd-image-set-clip (img image)
(first rectangle)
(second rectangle)
(third rectangle)
(fourth rectangle)))
rectangle)
(defun clipping-rectangle* (&optional (image *default-image*))
"Returns the clipping rectangle of IMAGE as four values."
(check-type image image)
(with-transformed-alternative
(((deref-pointer x1p) x-inv-transformer)
((deref-pointer y1p) y-inv-transformer)
((deref-pointer x2p) x-inv-transformer)
((deref-pointer y2p) y-inv-transformer))
(with-foreign-object (x1p :int)
(with-foreign-object (y1p :int)
(with-foreign-object (x2p :int)
(with-foreign-object (y2p :int)
(gd-image-get-clip (img image) x1p y1p x2p y2p)
(values (deref-pointer x1p :int)
(deref-pointer y1p :int)
(deref-pointer x2p :int)
(deref-pointer y2p :int))))))))
(defun set-clipping-rectangle* (x1 y1 x2 y2 &optional (image *default-image*))
"Sets the clipping rectangle of IMAGE to be the rectangle with upper
left corner \(X1, Y1) and lower right corner \(X2, Y2)."
(check-type image image)
(with-transformed-alternative
((x1 x-transformer)
(y1 y-transformer)
(x2 x-transformer)
(y2 y-transformer))
(gd-image-set-clip (img image) x1 y1 x2 y2))
(values x1 y1 x2 y2))
(defmacro with-clipping-rectangle ((rectangle &key (image '*default-image*)) &body body)
"Executes BODY with the clipping rectangle of IMAGE set to RECTANGLE
which should be a list \(X1 Y1 X2 Y2). The previous clipping rectangle
is guaranteed to be restored before the macro exits."
;; we rebind everything so we have left-to-right evaluation
(with-rebinding (rectangle image)
(with-unique-names (%x1 %y1 %x2 %y2)
`(multiple-value-bind (,%x1 ,%y1 ,%x2 ,%y2)
(without-transformations
(clipping-rectangle* ,image))
(unwind-protect
(progn
(setf (clipping-rectangle ,image) ,rectangle)
,@body)
(without-transformations
(set-clipping-rectangle* ,%x1 ,%y1 ,%x2 ,%y2 ,image)))))))
(defmacro with-clipping-rectangle* ((x1 y1 x2 y2 &key (image '*default-image*)) &body body)
"Executes BODY with the clipping rectangle of IMAGE set to the
rectangle with upper left corner \(X1, Y1) and lower right corner
\(X2, Y2). The previous clipping rectangle is guaranteed to be
restored before the macro exits."
;; we rebind everything so we have left-to-right evaluation
(with-rebinding (x1 y1 x2 y2 image)
(with-unique-names (%x1 %y1 %x2 %y2)
`(multiple-value-bind (,%x1 ,%y1 ,%x2 ,%y2)
(without-transformations
(clipping-rectangle* ,image))
(unwind-protect
(progn
(set-clipping-rectangle* ,x1 ,y1 ,x2 ,y2 ,image)
,@body)
(without-transformations
(set-clipping-rectangle* ,%x1 ,%y1 ,%x2 ,%y2 ,image)))))))
|
