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
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
|
%D \module
%D [ file=anch-pgr, % split off core-pos
%D version=1999.08.01,
%D title=\CONTEXT\ Anchoring Macros,
%D subtitle=Positioning Graphics,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Anchoring Macros / Grapics}
%D Before we come to graphics support, we have to make sure of the reference point
%D on the page. The next macros do so and are hooked into the page building routine.
\registerctxluafile{anch-pgr}{autosuffix}
\unprotect
%D A few more low level macros take care of defining and recalling actions. Actions
%D are saved globally! The lists can become quite long because there can be lots of
%D parameters passed on so we clean up the list afterwards.
\newtoks\everypositionaction
\newtoks\everyinsertpositionaction
\newtoks\everycleanpositionaction
\installcorenamespace{positionaction}
\installcorenamespace{positioncleanup}
\protected\def\anch_positions_set_action#1%
{\gdefcsname\??positionaction#1\endcsname} % nicely gobbles spaces
\permanent\protected\def\doifpositionaction#1%
{\ifcsname\??positionaction#1\endcsname
\expandafter\firstofoneargument
\else
\expandafter\gobbleoneargument
\fi}
\permanent\protected\def\doifelsepositionaction#1%
{\ifcsname\??positionaction#1\endcsname
\expandafter\firstoftwoarguments
\else
\expandafter\secondoftwoarguments
\fi}
\aliased\let\doifpositionactionelse\doifelsepositionaction
\permanent\protected\def\dopositionaction#1%
{\edef\currentpositionaction{#1}%
\ifcsname\??positionaction\currentpositionaction\endcsname
\anch_positions_action_indeed
\fi}
\def\anch_positions_action_indeed
{\doifelseposition\currentpositionaction
\anch_positions_action_indeed_yes
\anch_positions_action_indeed_nop}
\def\anch_positions_action_indeed_nop
{\anch_positions_trace_action_nop}
\def\anch_positions_action_indeed_yes % we need a way to figure out if we have actions
{\begingroup
\setbox\scratchbox\hbox % \hpack
{\anch_positions_trace_action_yes
\the\everyinsertpositionaction
\the\everypositionaction
\begincsname\??positionaction\currentpositionaction\endcsname
\anch_positions_cleanup_action}%
\smashedbox\scratchbox % smashing is really needed else we get problems with too big overlays
\endgroup}
\protected\def\anch_positions_trace_action_nop_indeed
{\anch_positions_trace\clap\darkred{<\currentpositionaction>}}
\protected\def\anch_positions_trace_action_yes_indeed
{\anch_positions_trace\clap\darkgreen{<\currentpositionaction>}}
\let\anch_positions_trace_action_nop\relax
\let\anch_positions_trace_action_yes\relax
\appendtoks
\let\anch_positions_trace_action_nop\anch_positions_trace_action_nop_indeed
\let\anch_positions_trace_action_yes\anch_positions_trace_action_yes_indeed
\to \t_anch_positions_tracers
%D Here the complication has to do with collecting actions for later execution. This
%D collection is especially handy when we want to move actions to a specific layer.
%D Such series of actions are stored in a macro that is cleaned up after each
%D invocation.
\def\anch_positions_cleanup_action % not in trialtypesetting
{\ifcsname\??positioncleanup\currentpositionaction\endcsname
\the\everycleanpositionaction
\xdefcsname\??positioncleanup\currentpositionaction\endcsname{\csname\??positioncleanup\currentpositionaction\endcsname}%
\fi}
\permanent\protected\def\handlepositionaction#1\with#2\on#3% ugly, will change
{\begingroup
\edef\currentpositionanchor{\ifempty\currentpositionoverlay#3\else\currentpositionoverlay::\MPanchoridentifier\fi}%
\normalexpanded{\anch_positions_set_action{\currentpositionanchor}{\noexpand\csname\??positioncleanup\currentpositionanchor\endcsname}}%
\let#1\relax
\ifcsname\??positioncleanup\currentpositionanchor\endcsname
\xdefcsname\??positioncleanup\currentpositionanchor\endcsname{\csname\??positioncleanup\currentpositionanchor\endcsname#1#2}%
\else
\xdefcsname\??positioncleanup\currentpositionanchor\endcsname{#1#2}%
\fi
\endgroup}
%D The first version of this module implemented head and tail anchors. Currently we
%D stick to just one anchor and derive the head and tail anchors from this one. We
%D set these anchors before and after each page.
\newdimen\c_anch_page_width
\newdimen\c_anch_page_height
\protected\def\anch_positions_register_page#1% this one is flushed first ! ... can't we avoid this one
{\ifpositioning\ifcase\realpageno\or
\ifdim\c_anch_page_height=\paperheight
\ifdim\c_anch_page_width=\paperwidth
% no change
\else
\c_anch_page_width \paperwidth
\c_anch_page_height\paperheight
\anch_make_page_box{#1}% \ifvbox#1\setbox#1\hpack{\box#1}\fi
\fi
\else
\c_anch_page_width \paperwidth
\c_anch_page_height\paperheight
\anch_make_page_box{#1}% \ifvbox#1\setbox#1\hpack{\box#1}\fi
\fi
\fi\fi}
\protected\def\anch_positions_place_anchors
{\ifpositioning
\anch_positions_place_anchors_yes
\else
\anch_positions_place_anchors_nop
\fi}
\def\anch_positions_place_anchors_yes % todo : depth pagebox
{\begingroup
\setbox\scratchbox\emptyhbox
\ht\scratchbox\textheight
\dp\scratchbox\zeropoint % redundant
\wd\scratchbox\makeupwidth
\anch_mark_text_box\scratchbox
\box\scratchbox
\endgroup}
\def\anch_positions_place_anchors_nop
{\vkern\textheight}
%D \macros
%D {positionoverlay,startpositionoverlay}
%D
%D As long as we're dealing with graphics it makes much sense to use the available
%D overlay mechanism. For this purpose, we define some dedicated overlay extensions.
%D
%D \startbuffer[sample]
%D \defineoverlay [sample] [\positionoverlay{sample}]
%D
%D \startpositionoverlay{sample}
%D \setMPpositiongraphic{A-1}{connectcenter}{from=A-1,to=A-2}
%D \stoppositionoverlay
%D \stopbuffer
%D
%D \typebuffer[sample]
%D
%D \startbuffer[graphic]
%D \startMPpositiongraphic{connectcenter}
%D path pa, pb ; pair ca, cb ;
%D initialize_box(\MPpos{\MPvar{from}}) ; pa := pxy ; ca := cxy ;
%D initialize_box(\MPpos{\MPvar{to}}) ; pb := pxy ; cb := cxy ;
%D draw pa withcolor red ;
%D draw pb withcolor red ;
%D draw ca -- cb withcolor blue ;
%D anchor_box(\MPanchor{\MPvar{from}}) ;
%D \stopMPpositiongraphic
%D \stopbuffer
%D
%D We can best demonstrate this in an example, say:
%D
%D \startbuffer[text]
%D \framed
%D [backgroundachtergrond=sample,align=middle,width=7cm]
%D {We want to connect \hpos {A-1} {this} word with its
%D grammatical cousin \hpos {A-2} {that}.}
%D \stopbuffer
%D
%D \typebuffer[text]
%D
%D \startlinecorrection
%D %\getbuffer[graphic,sample,text]
%D \stoplinecorrection
%D
%D The graphic is defined in the following way, using some macros defined in an
%D auxiliary \METAPOST\ module that is preloaded.
%D
%D \typebuffer[graphic]
\immutable\def\MPanchoridentifier{mpa} % {mp-anchor}
\mutable \def\MPanchornumber {\the\realpageno}
\mutable \let\MPanchorid \empty
%D The rest of the definitions concerning such overlays may look complicated,
\mutable\let\currentpositionoverlay\empty
%D Position actions are automatically executed when a position is set.
\immutable\def\textbackgroundoverlay#1{\v!text#1}
\permanent\protected\def\positionoverlay % the test prevents too many redundant positions
{\ifpositioning % in (not used) text* position layers
\expandafter\anch_positions_overlay_indeed
\else % also \iftrialtypesetting test here?
\expandafter\gobbleoneargument
\fi}
\def\anch_positions_overlay_indeed#1%
{\begingroup
\edef\currentpositionoverlay{#1}%
\ifcsname\??positionaction\currentpositionoverlay::\MPanchoridentifier\endcsname
\anch_positions_overlay_compose
\fi
\endgroup}
\permanent\def\MPoverlayanchor#1{\MPpos\MPanchorid}
\def\anch_positions_overlay_compose
{\vpack to \d_overlay_height
{%\writestatus{!!!}{\currentpositionoverlay/\MPanchoridentifier/\MPanchornumber}%
\edef\MPanchorid{\currentpositionoverlay::\MPanchoridentifier:\MPanchornumber}% realpageno
% \edef\MPanchor##1{\MPpos\MPanchorid}%
\enforced\let\MPanchor\MPoverlayanchor % no need to fetch it already, seldom used
\the\everyinsertpositionaction
\copyposition{\currentpositionoverlay::\MPanchoridentifier}\MPanchorid
\setbox\scratchbox\hbox to \d_overlay_width % \hpack
{\dopositionaction{\currentpositionoverlay::\MPanchoridentifier}\hss}%
\ht\scratchbox\d_overlay_height
\dp\scratchbox\zeropoint
\anch_mark_tagged_box\scratchbox\MPanchorid\zerocount % needs an hbox
\box\scratchbox
\vfill}}
\permanent\protected\def\positionregionoverlay % shares regions
{\ifpositioning
\expandafter\anch_positions_region_overlay_indeed
\else % also \iftrialtypesetting test here?
\expandafter\gobbletwoarguments
\fi}
\let\currentpositionregion\empty
\def\anch_positions_region_overlay_indeed#1#2%
{\begingroup
\edef\currentpositionregion {#1}%
\edef\currentpositionoverlay{#2}%
\ifcsname\??positionaction\currentpositionoverlay::\MPanchoridentifier\endcsname
\anch_positions_region_overlay_compose
\fi
\endgroup}
\def\anch_positions_region_overlay_compose
{\vpack to \d_overlay_height
{\let\MPanchorid\currentpositionregion
\enforced\let\MPanchor\MPoverlayanchor % no need to fetch it already, seldom used
\the\everyinsertpositionaction
\copyposition{\currentpositionoverlay::\MPanchoridentifier}\MPanchorid
\setbox\scratchbox\hbox to \d_overlay_width % \hpack
{\dopositionaction{\currentpositionoverlay::\MPanchoridentifier}\hss}%
\ht\scratchbox\d_overlay_height
\dp\scratchbox\zeropoint
\box\scratchbox
\vfill}}
% \let\anch_positions_overlay_nop\gobbleoneargument
\permanent\protected\def\startpositionoverlay
{\iftrialtypesetting
\expandafter\anch_positions_overlay_start_nop
\else
\expandafter\anch_positions_overlay_start_yes
\fi}
\def\anch_positions_overlay_start_nop#1\stoppositionoverlay
{}
\ifdefined\checkpositionoverlays \else \let\checkpositionoverlays\relax \fi
\mutable\let\currentpositionoverlay\empty
\def\anch_positions_overlay_start_yes#1%
{\checkpositionoverlays
\edef\currentpositionoverlay{#1}}
\permanent\protected\def\stoppositionoverlay
{\let\currentpositionoverlay\empty}
%D A position graphic is a normal (non||reused) \METAPOST\ graphic, used
%D immediately, with zero dimensions, so that a sequence of them does not harm.
\installcorenamespace{positiongraphic}
\installcorenamespace{positionmethod}
%installcorenamespace{graphicvariable}
\newbox\b_anch_positions_graphic
\permanent\tolerant\protected\def\startMPpositiongraphic#=#*#=#:#3\stopMPpositiongraphic % tag list mpcode
{\gdefcsname\??positiongraphic#1\endcsname{\anch_positions_meta_graphic_use{#1}{#2}{#3}}}
\permanent\protected\lettonothing\stopMPpositiongraphic
\def\anch_positions_meta_graphic_prepare
{\iftok{\mpcategoryparameter{self}}\emptytoks
\letmpcategoryparameter{self}\currentposition
\fi
\iftok{\mpcategoryparameter{from}}\emptytoks
\letmpcategoryparameter{from}\currentposition
\fi}
\def\anch_positions_meta_graphic_use#1#2#3%
{\begingroup
\edef\currentmpcategory{#1}%
\anch_positions_meta_graphic_prepare
\startMPcode#3\stopMPcode
\endgroup}
\permanent\tolerant\protected\def\MPpositiongraphic#=#*#=%
{\ifcsname\??positionmethod#1\endcsname % method
\expandafter\anch_positions_meta_graphic_direct_method
\orelse\ifcsname\??positiongraphic#1\endcsname
\expandafter\anch_positions_meta_graphic_direct_normal
\else
\expandafter\gobbletwoarguments
\fi{#1}{#2}}
\def\anch_positions_meta_graphic_direct_method{\anch_positions_meta_graphic_direct\??positionmethod }
\def\anch_positions_meta_graphic_direct_normal{\anch_positions_meta_graphic_direct\??positiongraphic}
\def\anch_positions_meta_graphic_direct#1#2#3% what tag setups
{\begingroup
\edef\currentmpcategory{#2}%
\setupcurrentmpcategory[#3]%
\anch_positions_meta_graphic_prepare
\obeyMPboxorigin % do we also set the size ? when needed this must be done in mp ... might change
\enforced\tolerant\protected\def\MPpositiongraphic##=##*##={\anch_positions_meta_graphic_nested{#3}{##1}{##2}}% takes two extra arguments
% \def\anch_positions_meta_graphic_direct{\anch_positions_meta_graphic_nested{#3}}% takes two extra arguments
\setbox\b_anch_positions_graphic\hpack
{\ignorespaces\begincsname#1#2\endcsname\removelastspace}%
\smashbox\b_anch_positions_graphic
\box\b_anch_positions_graphic
\endgroup}
\def\anch_positions_meta_graphic_nested#1#2#3% nesting used in prikkels / pascal (might go away)
{\begingroup
\edef\currentmpcategory{#2}%
\setupcurrentmpcategory[#1,#3]%
\anch_positions_meta_graphic_prepare
\begincsname\??positiongraphic#2\endcsname
\endgroup}%
\permanent\def\startMPpositionmethod#1#2\stopMPpositionmethod
{\gdefcsname\??positionmethod#1\endcsname{#2}} % todo: var list here
\permanent\protected\lettonothing\stopMPpositionmethod
%D Simple one position graphics.
\permanent\tolerant\protected\def\setMPpositiongraphic#=#*#=#*#=%
{\ifempty\currentpositionoverlay
\anch_positions_set_action{#1}{\MPpositiongraphic{#2}{#3}}%
\else % silly can be one
\anch_positions_meta_graphic_handle{#1}{#2}{#3}%
\fi}
\def\anch_positions_meta_graphic_handle#1#2#3% combine with boxes
{\handlepositionaction\anch_positions_meta_graphic_handle_indeed\with{#1}{#2}{#3}\on{#2}}
\def\anch_positions_meta_graphic_insert#1#2#3% pos tag setups
{\ifnum\MPp{#1}=\realpageno\relax % extra saveguard
\def\currentposition{#1}\MPpositiongraphic{#2}{#3}%
\fi}
\let\anch_positions_meta_graphic_handle_indeed\relax
\appendtoks
\let\anch_positions_meta_graphic_handle_indeed\anch_positions_meta_graphic_insert
\to \everyinsertpositionaction
\def\anch_positions_meta_graphic_cleanup#1#2#3% pos tag setups
{\ifnum\MPp{#1}<\realpageno \else
\noexpand\anch_positions_meta_graphic_handle_indeed{#1}{#2}{#3}%
\fi}
\appendtoks
\let\anch_positions_meta_graphic_handle_indeed\anch_positions_meta_graphic_cleanup
\to \everycleanpositionaction
%D Graphics that span two positions (beware, does not cross pages).
\permanent\tolerant\protected\def\setMPpositiongraphicrange#=#*#=#*#=#*#=%
{\ifempty\currentpositionoverlay
\anch_positions_set_action{#1}{\MPpositiongraphic{#3}{#4}}%
\else
\anch_positions_meta_graphic_handle_range{#1}{#2}{#3}{#4}%
\fi}
\def\anch_positions_meta_graphic_handle_range#1#2#3#4%
{\handlepositionaction\anch_positions_meta_graphic_handle_range_indeed\with{#1}{#2}{#3}{#4}\on{#2}}
\def\anch_positions_meta_graphic_insert_range#1#2#3#4% pos pos tag setups
{\clf_doifelserangeonpage{#1}{#2}\realpageno
{\def\currentposition{#1}%
\MPpositiongraphic{#3}{#4}}%
{}}
\appendtoks
\let\anch_positions_meta_graphic_handle_range_indeed\anch_positions_meta_graphic_insert_range
\to \everyinsertpositionaction
\def\anch_positions_meta_graphic_cleanup_range#1#2#3#4% pos tag setups
{\ifnum\MPp{#2}<\realpageno \else
\noexpand\anch_positions_meta_graphic_handle_range_indeed{#1}{#2}{#3}{#4}%
\fi}
\appendtoks
\let\anch_positions_meta_graphic_handle_range_indeed\anch_positions_meta_graphic_cleanup_range
\to \everycleanpositionaction
\let\anch_positions_meta_graphic_handle_range_indeed\gobblefourarguments
% Helpers:
\permanent\def\MPgetposboxes #1#2{\clf_fetchposboxes{#1}{#2}\realpageno}
\permanent\def\MPgetmultipars#1#2{\clf_fetchmultipar{#1}{#2}\realpageno}
\protect \endinput
|