c058c4ff2cc60cd1522db15664835679da5df37a
1 #define EXTENSION_INTERNAL_LATEX_TEXT_RENDERER_CPP
3 /** \file
4 * Rendering LaTeX file (pdf/eps/ps+latex output)
5 *
6 * The idea stems from GNUPlot's epslatex terminal output :-)
7 */
8 /*
9 * Authors:
10 * Johan Engelen <goejendaagh@zonnet.nl>
11 * Miklos Erdelyi <erdelyim@gmail.com>
12 *
13 * Copyright (C) 2006-2010 Authors
14 *
15 * Licensed under GNU GPL
16 */
18 #ifdef HAVE_CONFIG_H
19 # include "config.h"
20 #endif
22 #include "latex-text-renderer.h"
24 #include <signal.h>
25 #include <errno.h>
27 #include "libnrtype/Layout-TNG.h"
28 #include <2geom/transforms.h>
29 #include <2geom/rect.h>
31 #include <glibmm/i18n.h>
32 #include "sp-item.h"
33 #include "sp-item-group.h"
34 #include "style.h"
35 #include "sp-root.h"
36 #include "sp-use.h"
37 #include "sp-text.h"
38 #include "sp-flowtext.h"
39 #include "text-editing.h"
41 #include <unit-constants.h>
43 #include "extension/system.h"
45 #include "io/sys.h"
47 namespace Inkscape {
48 namespace Extension {
49 namespace Internal {
51 /**
52 * This method is called by the PDF, EPS and PS output extensions.
53 * @param filename This should be the filename without extension to which the tex code should be written. Output goes to <filename>.tex.
54 */
55 bool
56 latex_render_document_text_to_file( SPDocument *doc, gchar const *filename,
57 const gchar * const exportId, bool exportDrawing, bool exportCanvas,
58 bool pdflatex)
59 {
60 sp_document_ensure_up_to_date(doc);
62 SPItem *base = NULL;
64 bool pageBoundingBox = true;
65 if (exportId && strcmp(exportId, "")) {
66 // we want to export the given item only
67 base = SP_ITEM(doc->getObjectById(exportId));
68 pageBoundingBox = exportCanvas;
69 }
70 else {
71 // we want to export the entire document from root
72 base = SP_ITEM(sp_document_root(doc));
73 pageBoundingBox = !exportDrawing;
74 }
76 if (!base)
77 return false;
79 /* Create renderer */
80 LaTeXTextRenderer *renderer = new LaTeXTextRenderer(pdflatex);
82 bool ret = renderer->setTargetFile(filename);
83 if (ret) {
84 /* Render document */
85 bool ret = renderer->setupDocument(doc, pageBoundingBox, base);
86 if (ret) {
87 renderer->renderItem(base);
88 }
89 }
91 delete renderer;
93 return ret;
94 }
96 LaTeXTextRenderer::LaTeXTextRenderer(bool pdflatex)
97 : _stream(NULL),
98 _filename(NULL),
99 _pdflatex(pdflatex)
100 {
101 push_transform(Geom::identity());
102 }
104 LaTeXTextRenderer::~LaTeXTextRenderer(void)
105 {
106 if (_stream) {
107 writePostamble();
109 fclose(_stream);
110 }
112 /* restore default signal handling for SIGPIPE */
113 #if !defined(_WIN32) && !defined(__WIN32__)
114 (void) signal(SIGPIPE, SIG_DFL);
115 #endif
117 if (_filename) {
118 g_free(_filename);
119 }
121 return;
122 }
124 /** This should create the output LaTeX file, and assign it to _stream.
125 * @return Returns true when succesfull
126 */
127 bool
128 LaTeXTextRenderer::setTargetFile(gchar const *filename) {
129 if (filename != NULL) {
130 while (isspace(*filename)) filename += 1;
132 _filename = g_path_get_basename(filename);
134 gchar *filename_ext = g_strdup_printf("%s.tex", filename);
135 Inkscape::IO::dump_fopen_call(filename_ext, "K");
136 FILE *osf = Inkscape::IO::fopen_utf8name(filename_ext, "w+");
137 if (!osf) {
138 fprintf(stderr, "inkscape: fopen(%s): %s\n",
139 filename_ext, strerror(errno));
140 return false;
141 }
142 _stream = osf;
143 g_free(filename_ext);
144 }
146 if (_stream) {
147 /* fixme: this is kinda icky */
148 #if !defined(_WIN32) && !defined(__WIN32__)
149 (void) signal(SIGPIPE, SIG_IGN);
150 #endif
151 }
153 fprintf(_stream, "%%%% Creator: Inkscape %s, www.inkscape.org\n", PACKAGE_STRING);
154 fprintf(_stream, "%%%% PDF/EPS/PS + LaTeX output extension by Johan Engelen, 2010\n");
155 fprintf(_stream, "%%%% Accompanies image file '%s' (pdf, eps, ps)\n", _filename);
156 fprintf(_stream, "%%%%\n");
157 /* flush this to test output stream as early as possible */
158 if (fflush(_stream)) {
159 if (ferror(_stream)) {
160 g_print("Error %d on LaTeX file output stream: %s\n", errno,
161 g_strerror(errno));
162 }
163 g_print("Output to LaTeX file failed\n");
164 /* fixme: should use pclose() for pipes */
165 fclose(_stream);
166 _stream = NULL;
167 fflush(stdout);
168 return false;
169 }
171 writePreamble();
173 return true;
174 }
176 static char const preamble[] =
177 "%% To include the image in your LaTeX document, write\n"
178 "%% \\input{<filename>.tex}\n"
179 "%% instead of\n"
180 "%% \\includegraphics{<filename>.pdf}\n"
181 "%% To scale the image, write\n"
182 "%% \\def{\\svgwidth}{<desired width>}\n"
183 "%% \\input{<filename>.tex}\n"
184 "%% instead of\n"
185 "%% \\includegraphics[width=<desired width>]{<filename>.pdf}\n"
186 "\n"
187 "\\begingroup\n"
188 " \\makeatletter\n"
189 " \\providecommand\\color[2][]{%\n"
190 " \\errmessage{(Inkscape) Color is used for the text in Inkscape, but the package \'color.sty\' is not loaded}\n"
191 " \\renewcommand\\color[2][]{}%\n"
192 " }\n"
193 " \\providecommand\\transparent[1]{%\n"
194 " \\errmessage{(Inkscape) Transparency is used (non-zero) for the text in Inkscape, but the package \'transparent.sty\' is not loaded}\n"
195 " \\renewcommand\\transparent[1]{}%\n"
196 " }\n"
197 " \\providecommand\\rotatebox[2]{#2}\n";
199 static char const postamble[] =
200 " \\end{picture}%\n"
201 "\\endgroup\n";
203 void
204 LaTeXTextRenderer::writePreamble()
205 {
206 fprintf(_stream, "%s", preamble);
207 }
208 void
209 LaTeXTextRenderer::writePostamble()
210 {
211 fprintf(_stream, "%s", postamble);
212 }
214 void
215 LaTeXTextRenderer::sp_group_render(SPItem *item)
216 {
217 SPGroup *group = SP_GROUP(item);
219 GSList *l = g_slist_reverse(group->childList(false));
220 while (l) {
221 SPObject *o = SP_OBJECT (l->data);
222 if (SP_IS_ITEM(o)) {
223 renderItem (SP_ITEM (o));
224 }
225 l = g_slist_remove (l, o);
226 }
227 }
229 void
230 LaTeXTextRenderer::sp_use_render(SPItem *item)
231 {
232 bool translated = false;
233 SPUse *use = SP_USE(item);
235 if ((use->x._set && use->x.computed != 0) || (use->y._set && use->y.computed != 0)) {
236 Geom::Matrix tp(Geom::Translate(use->x.computed, use->y.computed));
237 push_transform(tp);
238 translated = true;
239 }
241 if (use->child && SP_IS_ITEM(use->child)) {
242 renderItem(SP_ITEM(use->child));
243 }
245 if (translated) {
246 pop_transform();
247 }
248 }
250 void
251 LaTeXTextRenderer::sp_text_render(SPItem *item)
252 {
253 SPText *textobj = SP_TEXT (item);
254 SPStyle *style = SP_OBJECT_STYLE (SP_OBJECT(item));
256 gchar *str = sp_te_get_string_multiline(item);
257 if (!str) {
258 return;
259 }
261 // get position and alignment
262 // Align vertically on the baseline of the font (retreived from the anchor point)
263 // Align horizontally on anchorpoint
264 gchar *alignment = NULL;
265 switch (style->text_anchor.computed) {
266 case SP_CSS_TEXT_ANCHOR_START:
267 alignment = "[lb]";
268 break;
269 case SP_CSS_TEXT_ANCHOR_END:
270 alignment = "[rb]";
271 break;
272 case SP_CSS_TEXT_ANCHOR_MIDDLE:
273 default:
274 alignment = "[b]";
275 break;
276 }
277 Geom::Point anchor = textobj->attributes.firstXY() * transform();
278 Geom::Point pos(anchor);
280 // determine color and transparency (for now, use rgb color model as it is most native to Inkscape)
281 bool has_color = false; // if the item has no color set, don't force black color
282 bool has_transparency = false;
283 // TODO: how to handle ICC colors?
284 // give priority to fill color
285 guint32 rgba = 0;
286 float opacity = SP_SCALE24_TO_FLOAT(style->opacity.value);
287 if (style->fill.set && style->fill.isColor()) {
288 has_color = true;
289 rgba = style->fill.value.color.toRGBA32(1.);
290 opacity *= SP_SCALE24_TO_FLOAT(style->fill_opacity.value);
291 } else if (style->stroke.set && style->stroke.isColor()) {
292 has_color = true;
293 rgba = style->stroke.value.color.toRGBA32(1.);
294 opacity *= SP_SCALE24_TO_FLOAT(style->stroke_opacity.value);
295 }
296 if (opacity < 1.0) {
297 has_transparency = true;
298 }
300 // get rotation
301 Geom::Matrix i2doc = sp_item_i2doc_affine(item);
302 Geom::Matrix wotransl = i2doc.without_translation();
303 double degrees = -180/M_PI * Geom::atan2(wotransl.xAxis());
304 bool has_rotation = !Geom::are_near(degrees,0.);
306 // write to LaTeX
307 Inkscape::SVGOStringStream os;
308 os.setf(std::ios::fixed); // don't use scientific notation
310 os << " \\put(" << pos[Geom::X] << "," << pos[Geom::Y] << "){";
311 if (has_color) {
312 os << "\\color[rgb]{" << SP_RGBA32_R_F(rgba) << "," << SP_RGBA32_G_F(rgba) << "," << SP_RGBA32_B_F(rgba) << "}";
313 }
314 if (_pdflatex && has_transparency) {
315 os << "\\transparent{" << opacity << "}";
316 }
317 if (has_rotation) {
318 os << "\\rotatebox{" << degrees << "}{";
319 }
320 os << "\\makebox(0,0)" << alignment << "{";
321 os << "\\smash{" << str << "}"; // smash the text, to be able to put the makebox coordinates at the baseline
322 if (has_rotation) {
323 os << "}"; // rotatebox end
324 }
325 os << "}"; //makebox end
326 os << "}%\n"; // put end
328 fprintf(_stream, "%s", os.str().c_str());
329 }
331 void
332 LaTeXTextRenderer::sp_flowtext_render(SPItem * /*item*/)
333 {
334 /* SPFlowtext *group = SP_FLOWTEXT(item);
336 // write to LaTeX
337 Inkscape::SVGOStringStream os;
338 os.setf(std::ios::fixed); // no scientific notation
340 os << " \\begin{picture}(" << _width << "," << _height << ")%%\n";
341 os << " \\gplgaddtomacro\\gplbacktext{%%\n";
342 os << " \\csname LTb\\endcsname%%\n";
343 os << "\\put(0,0){\\makebox(0,0)[lb]{\\strut{}Position}}%%\n";
345 fprintf(_stream, "%s", os.str().c_str());
346 */
347 }
349 void
350 LaTeXTextRenderer::sp_root_render(SPItem *item)
351 {
352 SPRoot *root = SP_ROOT(item);
354 push_transform(root->c2p);
355 sp_group_render(item);
356 pop_transform();
357 }
359 void
360 LaTeXTextRenderer::sp_item_invoke_render(SPItem *item)
361 {
362 // Check item's visibility
363 if (item->isHidden()) {
364 return;
365 }
367 if (SP_IS_ROOT(item)) {
368 return sp_root_render(item);
369 } else if (SP_IS_GROUP(item)) {
370 return sp_group_render(item);
371 } else if (SP_IS_USE(item)) {
372 sp_use_render(item);
373 } else if (SP_IS_TEXT(item)) {
374 return sp_text_render(item);
375 } else if (SP_IS_FLOWTEXT(item)) {
376 return sp_flowtext_render(item);
377 }
378 // We are not interested in writing the other SPItem types to LaTeX
379 }
381 void
382 LaTeXTextRenderer::renderItem(SPItem *item)
383 {
384 push_transform(item->transform);
385 sp_item_invoke_render(item);
386 pop_transform();
387 }
389 bool
390 LaTeXTextRenderer::setupDocument(SPDocument *doc, bool pageBoundingBox, SPItem *base)
391 {
392 // The boundingbox calculation here should be exactly the same as the one by CairoRenderer::setupDocument !
394 if (!base)
395 base = SP_ITEM(sp_document_root(doc));
397 Geom::OptRect d;
398 if (pageBoundingBox) {
399 d = Geom::Rect( Geom::Point(0,0),
400 Geom::Point(sp_document_width(doc), sp_document_height(doc)) );
401 } else {
402 sp_item_invoke_bbox(base, d, sp_item_i2d_affine(base), TRUE, SPItem::RENDERING_BBOX);
403 }
404 if (!d) {
405 g_message("LaTeXTextRenderer: could not retrieve boundingbox.");
406 return false;
407 }
409 // scale all coordinates, such that the width of the image is 1, this is convenient for scaling the image in LaTeX
410 double scale = 1/(d->width());
411 double _width = d->width() * scale;
412 double _height = d->height() * scale;
413 push_transform( Geom::Scale(scale, scale) );
415 if (!pageBoundingBox)
416 {
417 push_transform( Geom::Translate( - d->min() ) );
418 }
420 // flip y-axis
421 push_transform( Geom::Scale(1,-1) * Geom::Translate(0, sp_document_height(doc)) );
423 // write the info to LaTeX
424 Inkscape::SVGOStringStream os;
425 os.setf(std::ios::fixed); // no scientific notation
427 // scaling of the image when including it in LaTeX
429 os << " \\ifx\\svgwidth\\undefined\n";
430 os << " \\setlength{\\unitlength}{" << d->width() * PT_PER_PX << "pt}\n";
431 os << " \\else\n";
432 os << " \\setlength{\\unitlength}{\\svgwidth}\n";
433 os << " \\fi\n";
434 os << " \\global\\let\\svgwidth\\undefined\n";
435 os << " \\makeatother\n";
437 os << " \\begin{picture}(" << _width << "," << _height << ")%\n";
438 // strip pathname, as it is probably desired. Having a specific path in the TeX file is not convenient.
439 os << " \\put(0,0){\\includegraphics[width=\\unitlength]{" << _filename << "}}%\n";
441 fprintf(_stream, "%s", os.str().c_str());
443 return true;
444 }
446 Geom::Matrix const &
447 LaTeXTextRenderer::transform()
448 {
449 return _transform_stack.top();
450 }
452 void
453 LaTeXTextRenderer::push_transform(Geom::Matrix const &tr)
454 {
455 if(_transform_stack.size()){
456 Geom::Matrix tr_top = _transform_stack.top();
457 _transform_stack.push(tr * tr_top);
458 } else {
459 _transform_stack.push(tr);
460 }
461 }
463 void
464 LaTeXTextRenderer::pop_transform()
465 {
466 _transform_stack.pop();
467 }
469 } /* namespace Internal */
470 } /* namespace Extension */
471 } /* namespace Inkscape */
473 /*
474 Local Variables:
475 mode:c++
476 c-file-style:"stroustrup"
477 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
478 indent-tabs-mode:nil
479 fill-column:99
480 End:
481 */
482 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :