forked from unidoc/unidoc
/
creator.go
618 lines (535 loc) · 18.7 KB
/
creator.go
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
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
/*
* This file is subject to the terms and conditions defined in
* file 'LICENSE.md', which is part of this source code package.
*/
package contentstream
import (
"math"
. "github.com/unidoc/unidoc/pdf/core"
)
type ContentCreator struct {
operands ContentStreamOperations
}
func NewContentCreator() *ContentCreator {
creator := &ContentCreator{}
creator.operands = ContentStreamOperations{}
return creator
}
// Get the list of operations.
func (this *ContentCreator) Operations() *ContentStreamOperations {
return &this.operands
}
// Convert a set of content stream operations to a content stream byte presentation, i.e. the kind that can be
// stored as a PDF stream or string format.
func (this *ContentCreator) Bytes() []byte {
return this.operands.Bytes()
}
// Same as Bytes() except returns as a string for convenience.
func (this *ContentCreator) String() string {
return string(this.operands.Bytes())
}
/* Graphics state operators. */
// Save the current graphics state on the stack - push.
func (this *ContentCreator) Add_q() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "q"
this.operands = append(this.operands, &op)
return this
}
// Restore the most recently stored state from the stack - pop.
func (this *ContentCreator) Add_Q() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Q"
this.operands = append(this.operands, &op)
return this
}
// Display XObject - image or form.
func (this *ContentCreator) Add_Do(name PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Do"
op.Params = makeParamsFromNames([]PdfObjectName{name})
this.operands = append(this.operands, &op)
return this
}
// Modify the current transformation matrix (ctm).
func (this *ContentCreator) Add_cm(a, b, c, d, e, f float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "cm"
op.Params = makeParamsFromFloats([]float64{a, b, c, d, e, f})
this.operands = append(this.operands, &op)
return this
}
// Convenience function for generating a cm operation to translate the transformation matrix.
func (this *ContentCreator) Translate(tx, ty float64) *ContentCreator {
return this.Add_cm(1, 0, 0, 1, tx, ty)
}
// Convenience function for generating a cm command to scale the transformation matrix.
func (this *ContentCreator) Scale(sx, sy float64) *ContentCreator {
return this.Add_cm(sx, 0, 0, sy, 0, 0)
}
// Convenience function for generating a cm command to rotate transformation matrix.
func (this *ContentCreator) RotateDeg(angle float64) *ContentCreator {
u1 := math.Cos(angle * math.Pi / 180.0)
u2 := math.Sin(angle * math.Pi / 180.0)
u3 := -math.Sin(angle * math.Pi / 180.0)
u4 := math.Cos(angle * math.Pi / 180.0)
return this.Add_cm(u1, u2, u3, u4, 0, 0)
}
// Set the line width.
func (this *ContentCreator) Add_w(lineWidth float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "w"
op.Params = makeParamsFromFloats([]float64{lineWidth})
this.operands = append(this.operands, &op)
return this
}
// Set the line cap style.
func (this *ContentCreator) Add_J(lineCapStyle string) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "J"
op.Params = makeParamsFromNames([]PdfObjectName{PdfObjectName(lineCapStyle)})
this.operands = append(this.operands, &op)
return this
}
// Set the line join style.
func (this *ContentCreator) Add_j(lineJoinStyle string) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "j"
op.Params = makeParamsFromNames([]PdfObjectName{PdfObjectName(lineJoinStyle)})
this.operands = append(this.operands, &op)
return this
}
// Set the miter limit.
func (this *ContentCreator) Add_M(miterlimit float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "M"
op.Params = makeParamsFromFloats([]float64{miterlimit})
this.operands = append(this.operands, &op)
return this
}
// Set the line dash pattern.
func (this *ContentCreator) Add_d(dashArray []int64, dashPhase int64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "d"
op.Params = []PdfObject{}
op.Params = append(op.Params, MakeArrayFromIntegers64(dashArray))
op.Params = append(op.Params, MakeInteger(dashPhase))
this.operands = append(this.operands, &op)
return this
}
// Set the color rendering intent.
func (this *ContentCreator) Add_ri(intent PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "ri"
op.Params = makeParamsFromNames([]PdfObjectName{intent})
this.operands = append(this.operands, &op)
return this
}
// Set the flatness tolerance.
func (this *ContentCreator) Add_i(flatness float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "i"
op.Params = makeParamsFromFloats([]float64{flatness})
this.operands = append(this.operands, &op)
return this
}
// Set the graphics state.
func (this *ContentCreator) Add_gs(dictName PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "gs"
op.Params = makeParamsFromNames([]PdfObjectName{dictName})
this.operands = append(this.operands, &op)
return this
}
/* Path construction operators. */
// m: Move the current point to (x,y).
func (this *ContentCreator) Add_m(x, y float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "m"
op.Params = makeParamsFromFloats([]float64{x, y})
this.operands = append(this.operands, &op)
return this
}
// l: Append a straight line segment from the current point to (x,y).
func (this *ContentCreator) Add_l(x, y float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "l"
op.Params = makeParamsFromFloats([]float64{x, y})
this.operands = append(this.operands, &op)
return this
}
// c: Append a Bezier curve to the current path from the current point to (x3,y3) with (x1,x1) and (x2,y2) as control
// points.
func (this *ContentCreator) Add_c(x1, y1, x2, y2, x3, y3 float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "c"
op.Params = makeParamsFromFloats([]float64{x1, y1, x2, y2, x3, y3})
this.operands = append(this.operands, &op)
return this
}
// v: Append a Bezier curve to the current path from the current point to (x3,y3) with the current point and (x2,y2) as
// control points.
func (this *ContentCreator) Add_v(x2, y2, x3, y3 float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "v"
op.Params = makeParamsFromFloats([]float64{x2, y2, x3, y3})
this.operands = append(this.operands, &op)
return this
}
// y: Append a Bezier curve to the current path from the current point to (x3,y3) with (x1, y1) and (x3,y3) as
// control points.
func (this *ContentCreator) Add_y(x1, y1, x3, y3 float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "y"
op.Params = makeParamsFromFloats([]float64{x1, y1, x3, y3})
this.operands = append(this.operands, &op)
return this
}
// h: Close the current subpath by adding a line between the current position and the starting position.
func (this *ContentCreator) Add_h() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "h"
this.operands = append(this.operands, &op)
return this
}
// re: Append a rectangle to the current path as a complete subpath, with lower left corner (x,y).
func (this *ContentCreator) Add_re(x, y, width, height float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "re"
op.Params = makeParamsFromFloats([]float64{x, y, width, height})
this.operands = append(this.operands, &op)
return this
}
/* Path painting operators. */
// S: stroke the path.
func (this *ContentCreator) Add_S() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "S"
this.operands = append(this.operands, &op)
return this
}
// s: Close and stroke the path.
func (this *ContentCreator) Add_s() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "s"
this.operands = append(this.operands, &op)
return this
}
// f: Fill the path using the nonzero winding number rule to determine fill region.
func (this *ContentCreator) Add_f() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "f"
this.operands = append(this.operands, &op)
return this
}
// f*: Fill the path using the even-odd rule to determine fill region.
func (this *ContentCreator) Add_f_starred() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "f*"
this.operands = append(this.operands, &op)
return this
}
// B: Fill and then stroke the path (nonzero winding number rule).
func (this *ContentCreator) Add_B() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "B"
this.operands = append(this.operands, &op)
return this
}
// B*: Fill and then stroke the path (even-odd rule).
func (this *ContentCreator) Add_B_starred() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "B*"
this.operands = append(this.operands, &op)
return this
}
// b: Close, fill and then stroke the path (nonzero winding number rule).
func (this *ContentCreator) Add_b() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "b"
this.operands = append(this.operands, &op)
return this
}
// b*: Close, fill and then stroke the path (even-odd winding number rule).
func (this *ContentCreator) Add_b_starred() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "b*"
this.operands = append(this.operands, &op)
return this
}
// n: End the path without filling or stroking.
func (this *ContentCreator) Add_n() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "n"
this.operands = append(this.operands, &op)
return this
}
/* Clipping path operators. */
// W: Modify the current clipping path by intersecting with the current path (nonzero winding rule).
func (this *ContentCreator) Add_W() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "W"
this.operands = append(this.operands, &op)
return this
}
// W*: Modify the current clipping path by intersecting with the current path (even odd rule).
func (this *ContentCreator) Add_W_starred() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "W*"
this.operands = append(this.operands, &op)
return this
}
/* Color operators. */
// CS: Set the current colorspace for stroking operations.
func (this *ContentCreator) Add_CS(name PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "CS"
op.Params = makeParamsFromNames([]PdfObjectName{name})
this.operands = append(this.operands, &op)
return this
}
// cs: Same as CS but for non-stroking operations.
func (this *ContentCreator) Add_cs(name PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "cs"
op.Params = makeParamsFromNames([]PdfObjectName{name})
this.operands = append(this.operands, &op)
return this
}
// SC: Set color for stroking operations. Input: c1, ..., cn.
func (this *ContentCreator) Add_SC(c ...float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "SC"
op.Params = makeParamsFromFloats(c)
this.operands = append(this.operands, &op)
return this
}
// SCN: Same as SC but supports more colorspaces.
func (this *ContentCreator) Add_SCN(c ...float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "SCN"
op.Params = makeParamsFromFloats(c)
this.operands = append(this.operands, &op)
return this
}
// SCN with name attribute (for pattern). Syntax: c1 ... cn name SCN.
func (this *ContentCreator) Add_SCN_pattern(name PdfObjectName, c ...float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "SCN"
op.Params = makeParamsFromFloats(c)
op.Params = append(op.Params, MakeName(string(name)))
this.operands = append(this.operands, &op)
return this
}
// scn: Same as SC but for nonstroking operations.
func (this *ContentCreator) Add_scn(c ...float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "scn"
op.Params = makeParamsFromFloats(c)
this.operands = append(this.operands, &op)
return this
}
// scn with name attribute (for pattern). Syntax: c1 ... cn name scn.
func (this *ContentCreator) Add_scn_pattern(name PdfObjectName, c ...float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "scn"
op.Params = makeParamsFromFloats(c)
op.Params = append(op.Params, MakeName(string(name)))
this.operands = append(this.operands, &op)
return this
}
// G: Set the stroking colorspace to DeviceGray and sets the gray level (0-1).
func (this *ContentCreator) Add_G(gray float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "G"
op.Params = makeParamsFromFloats([]float64{gray})
this.operands = append(this.operands, &op)
return this
}
// g: Same as G but used for nonstroking operations.
func (this *ContentCreator) Add_g(gray float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "g"
op.Params = makeParamsFromFloats([]float64{gray})
this.operands = append(this.operands, &op)
return this
}
// RG: Set the stroking colorspace to DeviceRGB and sets the r,g,b colors (0-1 each).
func (this *ContentCreator) Add_RG(r, g, b float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "RG"
op.Params = makeParamsFromFloats([]float64{r, g, b})
this.operands = append(this.operands, &op)
return this
}
// rg: Same as RG but used for nonstroking operations.
func (this *ContentCreator) Add_rg(r, g, b float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "rg"
op.Params = makeParamsFromFloats([]float64{r, g, b})
this.operands = append(this.operands, &op)
return this
}
// K: Set the stroking colorspace to DeviceCMYK and sets the c,m,y,k color (0-1 each component).
func (this *ContentCreator) Add_K(c, m, y, k float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "K"
op.Params = makeParamsFromFloats([]float64{c, m, y, k})
this.operands = append(this.operands, &op)
return this
}
// k: Same as K but used for nonstroking operations.
func (this *ContentCreator) Add_k(c, m, y, k float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "k"
op.Params = makeParamsFromFloats([]float64{c, m, y, k})
this.operands = append(this.operands, &op)
return this
}
/* Shading operators. */
func (this *ContentCreator) Add_sh(name PdfObjectName) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "sh"
op.Params = makeParamsFromNames([]PdfObjectName{name})
this.operands = append(this.operands, &op)
return this
}
/* Text related operators */
/* Text state operators */
// BT: Begin text.
func (this *ContentCreator) Add_BT() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "BT"
this.operands = append(this.operands, &op)
return this
}
// ET: End text.
func (this *ContentCreator) Add_ET() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "ET"
this.operands = append(this.operands, &op)
return this
}
// Tc: Set character spacing.
func (this *ContentCreator) Add_Tc(charSpace float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tc"
op.Params = makeParamsFromFloats([]float64{charSpace})
this.operands = append(this.operands, &op)
return this
}
// Tw: Set word spacing.
func (this *ContentCreator) Add_Tw(wordSpace float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tw"
op.Params = makeParamsFromFloats([]float64{wordSpace})
this.operands = append(this.operands, &op)
return this
}
// Tz: Set horizontal scaling.
func (this *ContentCreator) Add_Tz(scale float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tz"
op.Params = makeParamsFromFloats([]float64{scale})
this.operands = append(this.operands, &op)
return this
}
// TL: Set leading.
func (this *ContentCreator) Add_TL(leading float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "TL"
op.Params = makeParamsFromFloats([]float64{leading})
this.operands = append(this.operands, &op)
return this
}
// Tf: Set font and font size.
func (this *ContentCreator) Add_Tf(fontName PdfObjectName, fontSize float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tf"
op.Params = makeParamsFromNames([]PdfObjectName{fontName})
op.Params = append(op.Params, makeParamsFromFloats([]float64{fontSize})...)
this.operands = append(this.operands, &op)
return this
}
// Tr: Set text rendering mode.
func (this *ContentCreator) Add_Tr(render int64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tr"
op.Params = makeParamsFromInts([]int64{render})
this.operands = append(this.operands, &op)
return this
}
// Ts: Set text rise.
func (this *ContentCreator) Add_Ts(rise float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Ts"
op.Params = makeParamsFromFloats([]float64{rise})
this.operands = append(this.operands, &op)
return this
}
/* Text positioning operators. */
// Td: Move to start of next line with offset (tx, ty).
func (this *ContentCreator) Add_Td(tx, ty float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Td"
op.Params = makeParamsFromFloats([]float64{tx, ty})
this.operands = append(this.operands, &op)
return this
}
// TD: Move to start of next line with offset (tx, ty).
func (this *ContentCreator) Add_TD(tx, ty float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "TD"
op.Params = makeParamsFromFloats([]float64{tx, ty})
this.operands = append(this.operands, &op)
return this
}
// Tm: Set the text line matrix.
func (this *ContentCreator) Add_Tm(a, b, c, d, e, f float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tm"
op.Params = makeParamsFromFloats([]float64{a, b, c, d, e, f})
this.operands = append(this.operands, &op)
return this
}
// T*: Move to the start of next line.
func (this *ContentCreator) Add_Tstar() *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "T*"
this.operands = append(this.operands, &op)
return this
}
/* Text showing operators */
// Tj: Show a text string.
func (this *ContentCreator) Add_Tj(textstr PdfObjectString) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "Tj"
op.Params = makeParamsFromStrings([]PdfObjectString{textstr})
this.operands = append(this.operands, &op)
return this
}
// ': Move to next line and show a string.
func (this *ContentCreator) Add_quote(textstr PdfObjectString) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "'"
op.Params = makeParamsFromStrings([]PdfObjectString{textstr})
this.operands = append(this.operands, &op)
return this
}
// '': Move to next line and show a string, using aw and ac as word and character spacing respectively.
func (this *ContentCreator) Add_quotes(textstr PdfObjectString, aw, ac float64) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "''"
op.Params = makeParamsFromFloats([]float64{aw, ac})
op.Params = append(op.Params, makeParamsFromStrings([]PdfObjectString{textstr})...)
this.operands = append(this.operands, &op)
return this
}
// TJ. Show one or more text string. Array of numbers (displacement) and strings.
func (this *ContentCreator) Add_TJ(vals ...PdfObject) *ContentCreator {
op := ContentStreamOperation{}
op.Operand = "TJ"
op.Params = []PdfObject{MakeArray(vals...)}
this.operands = append(this.operands, &op)
return this
}