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
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
|
if not modules then modules = { } end modules ['mlib-pdf'] = {
version = 1.001,
comment = "companion to mlib-ctx.mkiv",
author = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
copyright = "PRAGMA ADE / ConTeXt Development Team",
license = "see context related readme files",
}
-- maybe %s is better than %f
local format, concat, gsub = string.format, table.concat, string.gsub
local abs, sqrt, round = math.abs, math.sqrt, math.round
local setmetatable, rawset, tostring, tonumber, type = setmetatable, rawset, tostring, tonumber, type
local P, S, C, Ct, Cc, Cg, Cf, Carg = lpeg.P, lpeg.S, lpeg.C, lpeg.Ct, lpeg.Cc, lpeg.Cg, lpeg.Cf, lpeg.Carg
local lpegmatch = lpeg.match
local formatters = string.formatters
local report_metapost = logs.reporter("metapost")
local mplib, context = mplib, context
local allocate = utilities.storage.allocate
local copy_node = node.copy
local write_node = node.write
metapost = metapost or { }
local metapost = metapost
metapost.flushers = metapost.flushers or { }
local pdfflusher = { }
metapost.flushers.pdf = pdfflusher
metapost.multipass = false
metapost.n = 0
metapost.optimize = true -- false
local experiment = true -- uses context(node) that already does delayed nodes
local savedliterals = nil -- needs checking
local mpsliteral = nodes.pool.register(node.new("whatsit",nodes.whatsitcodes.pdfliteral)) -- pdfliteral.mode = 1
local pdfliteral = function(s)
local literal = copy_node(mpsliteral)
literal.data = s
return literal
end
-- Because in MKiV we always have two passes, we save the objects. When an extra
-- mp run is done (due to for instance texts identifier in the parse pass), we
-- get a new result table and the stored objects are forgotten. Otherwise they
-- are reused.
local function getobjects(result,figure,f)
if metapost.optimize then
local objects = result.objects
if not objects then
result.objects = { }
end
objects = result.objects[f]
if not objects then
objects = figure:objects()
result.objects[f] = objects
end
return objects
else
return figure:objects()
end
end
function metapost.convert(result, trialrun, flusher, multipass, askedfig)
if trialrun then
metapost.multipass = false
metapost.parse(result, askedfig)
if multipass and not metapost.multipass and metapost.optimize then
metapost.flush(result, flusher, askedfig) -- saves a run
else
return false
end
else
metapost.flush(result, flusher, askedfig)
end
return true -- done
end
function metapost.flushliteral(d)
if savedliterals then
local literal = copy_node(mpsliteral)
literal.data = savedliterals[d]
write_node(literal)
else
report_metapost("problem flushing literal %a",d)
end
end
function metapost.flushreset() -- will become obsolete and internal
savedliterals = nil
end
function pdfflusher.comment(message)
if message then
message = formatters["%% mps graphic %s: %s"](metapost.n,message)
if experiment then
context(pdfliteral(message))
else
if savedliterals then
local last = #savedliterals + 1
savedliterals[last] = message
context.MPLIBtoPDF(last)
else
savedliterals = { message }
context.MPLIBtoPDF(1)
end
end
end
end
function pdfflusher.startfigure(n,llx,lly,urx,ury,message)
savedliterals = nil
metapost.n = metapost.n + 1
context.startMPLIBtoPDF(llx,lly,urx,ury)
if message then pdfflusher.comment(message) end
end
function pdfflusher.stopfigure(message)
if message then pdfflusher.comment(message) end
context.stopMPLIBtoPDF()
context.MPLIBflushreset() -- maybe just at the beginning
end
function pdfflusher.flushfigure(pdfliterals) -- table
if #pdfliterals > 0 then
pdfliterals = concat(pdfliterals,"\n")
if experiment then
context(pdfliteral(pdfliterals))
else
if savedliterals then
local last = #savedliterals + 1
savedliterals[last] = pdfliterals
context.MPLIBtoPDF(last)
else
savedliterals = { pdfliterals }
context.MPLIBtoPDF(1)
end
end
end
end
function pdfflusher.textfigure(font,size,text,width,height,depth) -- we could save the factor
text = gsub(text,".","\\hbox{%1}") -- kerning happens in metapost (i have to check if this is true for mplib)
context.MPtextext(font,size,text,0,-number.dimenfactors.bp*depth)
end
local bend_tolerance = 131/65536
local rx, sx, sy, ry, tx, ty, divider = 1, 0, 0, 1, 0, 0, 1
local pen_info = mplib.pen_info
local function pen_characteristics(object)
local t = pen_info(object)
rx, ry, sx, sy, tx, ty = t.rx, t.ry, t.sx, t.sy, t.tx, t.ty
divider = sx*sy - rx*ry
return not (sx==1 and rx==0 and ry==0 and sy==1 and tx==0 and ty==0), t.width
end
local function mpconcat(px, py) -- no tx, ty here / we can move this one inline if needed
return (sy*px-ry*py)/divider,(sx*py-rx*px)/divider
end
local function curved(ith,pth)
local d = pth.left_x - ith.right_x
if abs(ith.right_x - ith.x_coord - d) <= bend_tolerance and abs(pth.x_coord - pth.left_x - d) <= bend_tolerance then
d = pth.left_y - ith.right_y
if abs(ith.right_y - ith.y_coord - d) <= bend_tolerance and abs(pth.y_coord - pth.left_y - d) <= bend_tolerance then
return false
end
end
return true
end
local function flushnormalpath(path, t, open)
local pth, ith, nt
if t then
nt = #t
else
t = { }
nt = 0
end
for i=1,#path do
nt = nt + 1
pth = path[i]
if not ith then
t[nt] = formatters["%f %f m"](pth.x_coord,pth.y_coord)
elseif curved(ith,pth) then
t[nt] = formatters["%f %f %f %f %f %f c"](ith.right_x,ith.right_y,pth.left_x,pth.left_y,pth.x_coord,pth.y_coord)
else
t[nt] = formatters["%f %f l"](pth.x_coord,pth.y_coord)
end
ith = pth
end
if not open then
nt = nt + 1
local one = path[1]
if curved(pth,one) then
t[nt] = formatters["%f %f %f %f %f %f c"](pth.right_x,pth.right_y,one.left_x,one.left_y,one.x_coord,one.y_coord )
else
t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
end
elseif #path == 1 then
-- special case .. draw point
local one = path[1]
nt = nt + 1
t[nt] = formatters["%f %f l"](one.x_coord,one.y_coord)
end
return t
end
local function flushconcatpath(path, t, open)
local pth, ith, nt
if t then
nt = #t
else
t = { }
nt = 0
end
nt = nt + 1
t[nt] = formatters["%f %f %f %f %f %f cm"](sx,rx,ry,sy,tx,ty)
for i=1,#path do
nt = nt + 1
pth = path[i]
if not ith then
t[nt] = formatters["%f %f m"](mpconcat(pth.x_coord,pth.y_coord))
elseif curved(ith,pth) then
local a, b = mpconcat(ith.right_x,ith.right_y)
local c, d = mpconcat(pth.left_x,pth.left_y)
t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(pth.x_coord,pth.y_coord))
else
t[nt] = formatters["%f %f l"](mpconcat(pth.x_coord, pth.y_coord))
end
ith = pth
end
if not open then
nt = nt + 1
local one = path[1]
if curved(pth,one) then
local a, b = mpconcat(pth.right_x,pth.right_y)
local c, d = mpconcat(one.left_x,one.left_y)
t[nt] = formatters["%f %f %f %f %f %f c"](a,b,c,d,mpconcat(one.x_coord, one.y_coord))
else
t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
end
elseif #path == 1 then
-- special case .. draw point
nt = nt + 1
local one = path[1]
t[nt] = formatters["%f %f l"](mpconcat(one.x_coord,one.y_coord))
end
return t
end
metapost.flushnormalpath = flushnormalpath
-- The flusher is pdf based, if another backend is used, we need to overload the
-- flusher; this is beta code, the organization will change (already upgraded in
-- sync with mplib)
--
-- We can avoid the before table but I like symmetry. There is of course a small
-- performance penalty, but so is passing extra arguments (result, flusher, after)
-- and returning stuff.
local ignore = function () end
local space = P(" ")
local equal = P("=")
local key = C((1-equal)^1) * equal
local newline = S("\n\r")^1
local number = (((1-space-newline)^1) / tonumber) * (space^0)
local variable =
lpeg.P("1:") * key * number
+ lpeg.P("2:") * key * C((1-newline)^0)
+ lpeg.P("3:") * key * (P("false") * Cc(false) + P("true") * Cc(true))
+ lpeg.S("456") * P(":") * key * Ct(number^1)
+ lpeg.P("7:") * key * Ct(Ct(number * number^-5)^1)
local pattern = Cf ( Carg(1) * (Cg(variable * newline^0)^0), rawset)
metapost.variables = { }
metapost.llx = 0
metapost.lly = 0
metapost.urx = 0
metapost.ury = 0
function commands.mprunvar(key)
local value = variables and variables[key]
local vtype = type(value)
if tvalue == "table" then
context(concat(value," "))
elseif tvalue == "number" or tvalue == "boolean" then
context(concat(value,tostring(value)))
elseif tvalue == "string" then
context(concat(value," "))
end
end
function metapost.flush(result,flusher,askedfig)
if result then
local figures = result.fig
if figures then
flusher = flusher or pdfflusher
local resetplugins = metapost.resetplugins or ignore -- before figure
local processplugins = metapost.processplugins or ignore -- each object
local synchronizeplugins = metapost.synchronizeplugins or ignore
local pluginactions = metapost.pluginactions or ignore -- before / after
local startfigure = flusher.startfigure
local stopfigure = flusher.stopfigure
local flushfigure = flusher.flushfigure
local textfigure = flusher.textfigure
for f=1,#figures do
local figure = figures[f]
local objects = getobjects(result,figure,f)
local fignum = figure:charcode() or 0
if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
local t = { }
local miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
local bbox = figure:boundingbox()
local llx, lly, urx, ury = bbox[1], bbox[2], bbox[3], bbox[4]
local variables = { }
metapost.llx = llx
metapost.lly = lly
metapost.urx = urx
metapost.ury = ury
metapost.variables = variables
if urx < llx then
-- invalid
startfigure(fignum,0,0,0,0,"invalid",figure)
stopfigure()
else
startfigure(fignum,llx,lly,urx,ury,"begin",figure)
t[#t+1] = "q"
if objects then
resetplugins(t) -- we should move the colorinitializer here
for o=1,#objects do
local object = objects[o]
local objecttype = object.type
if objecttype == "start_bounds" or objecttype == "stop_bounds" then
-- skip
elseif objecttype == "special" then
lpegmatch(pattern,object.prescript,1,variables)
elseif objecttype == "start_clip" then
t[#t+1] = "q"
flushnormalpath(object.path,t,false)
t[#t+1] = "W n"
elseif objecttype == "stop_clip" then
t[#t+1] = "Q"
miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
elseif objecttype == "text" then
t[#t+1] = "q"
local ot = object.transform -- 3,4,5,6,1,2
t[#t+1] = formatters["%f %f %f %f %f %f cm"](ot[3],ot[4],ot[5],ot[6],ot[1],ot[2]) -- TH: formatters["%f %f m %f %f %f %f 0 0 cm"](unpack(ot))
flushfigure(t) -- flush accumulated literals
t = { }
textfigure(object.font,object.dsize,object.text,object.width,object.height,object.depth)
t[#t+1] = "Q"
else
-- we use an indirect table as we want to overload
-- entries but this is not possible in userdata
--
-- can be optimized if no path
--
local original = object
local object = { }
setmetatable(object, {
__index = original
})
-- first we analyze
local before, after = processplugins(object)
local objecttype = object.type -- can have changed
if before then
t = pluginactions(before,t,flushfigure)
end
local ml = object.miterlimit
if ml and ml ~= miterlimit then
miterlimit = ml
t[#t+1] = formatters["%f M"](ml)
end
local lj = object.linejoin
if lj and lj ~= linejoin then
linejoin = lj
t[#t+1] = formatters["%i j"](lj)
end
local lc = object.linecap
if lc and lc ~= linecap then
linecap = lc
t[#t+1] = formatters["%i J"](lc)
end
local dl = object.dash
if dl then
local d = formatters["[%s] %f d"](concat(dl.dashes or {}," "),dl.offset)
if d ~= dashed then
dashed = d
t[#t+1] = dashed
end
elseif dashed then
t[#t+1] = "[] 0 d"
dashed = false
end
local path = object.path -- newpath
local transformed, penwidth = false, 1
local open = path and path[1].left_type and path[#path].right_type -- at this moment only "end_point"
local pen = object.pen
if pen then
if pen.type == 'elliptical' then
transformed, penwidth = pen_characteristics(original) -- boolean, value
t[#t+1] = formatters["%f w"](penwidth) -- todo: only if changed
if objecttype == 'fill' then
objecttype = 'both'
end
else -- calculated by mplib itself
objecttype = 'fill'
end
end
if transformed then
t[#t+1] = "q"
end
if path then
if transformed then
flushconcatpath(path,t,open)
else
flushnormalpath(path,t,open)
end
if objecttype == "fill" then
t[#t+1] = "h f"
elseif objecttype == "outline" then
t[#t+1] = (open and "S") or "h S"
elseif objecttype == "both" then
t[#t+1] = "h B"
end
end
if transformed then
t[#t+1] = "Q"
end
local path = object.htap
if path then
if transformed then
t[#t+1] = "q"
end
if transformed then
flushconcatpath(path,t,open)
else
flushnormalpath(path,t,open)
end
if objecttype == "fill" then
t[#t+1] = "h f"
elseif objecttype == "outline" then
t[#t+1] = (open and "S") or "h S"
elseif objecttype == "both" then
t[#t+1] = "h B"
end
if transformed then
t[#t+1] = "Q"
end
end
if after then
t = pluginactions(after,t,flushfigure)
end
if object.grouped then
-- can be qQ'd so changes can end up in groups
miterlimit, linecap, linejoin, dashed = -1, -1, -1, false
end
end
end
end
t[#t+1] = "Q"
flushfigure(t)
stopfigure("end")
end
if askedfig ~= "all" then
break
end
end
end
end
end
end
function metapost.parse(result,askedfig)
if result then
local figures = result.fig
if figures then
local analyzeplugins = metapost.analyzeplugins -- each object
for f=1,#figures do
local figure = figures[f]
local fignum = figure:charcode() or 0
if askedfig == "direct" or askedfig == "all" or askedfig == fignum then
local bbox = figure:boundingbox()
metapost.llx = bbox[1]
metapost.lly = bbox[2]
metapost.urx = bbox[3]
metapost.ury = bbox[4]
local objects = getobjects(result,figure,f)
if objects then
for o=1,#objects do
analyzeplugins(objects[o])
end
end
if askedfig ~= "all" then
break
end
end
end
end
end
end
-- tracing:
local t = { }
local flusher = {
startfigure = function()
t = { }
context.startnointerference()
end,
flushfigure = function(literals)
local n = #t
for i=1, #literals do
n = n + 1
t[n] = literals[i]
end
end,
stopfigure = function()
context.stopnointerference()
end
}
function metapost.pdfliterals(result)
metapost.flush(result,flusher)
return t
end
-- so far
function metapost.totable(result)
local figure = result and result.fig and result.fig[1]
if figure then
local t = { }
local objects = figure:objects()
for o=1,#objects do
local object = objects[o]
local tt = { }
local fields = mplib.fields(object)
for f=1,#fields do
local field = fields[f]
tt[field] = object[field]
end
t[o] = tt
end
local b = figure:boundingbox()
return {
boundingbox = { llx = b[1], lly = b[2], urx = b[3], ury = b[4] },
objects = t
}
else
return nil
end
end
|