1 /*
2 * A simple utility for exporting Inkscape svg Shapes as PovRay bezier
3 * prisms. Note that this is output-only, and would thus seem to be
4 * better placed as an 'export' rather than 'output'. However, Export
5 * handles all or partial documents, while this outputs ALL shapes in
6 * the current SVG document.
7 *
8 * For information on the PovRay file format, see:
9 * http://www.povray.org
10 *
11 * Authors:
12 * Bob Jamison <ishmal@inkscape.org>
13 *
14 * Copyright (C) 2004-2008 Authors
15 *
16 * Released under GNU GPL, read the file 'COPYING' for more information
17 */
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23 #include "pov-out.h"
24 #include <inkscape.h>
25 #include <inkscape_version.h>
26 #include <sp-path.h>
27 #include <style.h>
28 #include <display/curve.h>
29 #include <libnr/n-art-bpath.h>
30 #include <extension/system.h>
31 #include <2geom/pathvector.h>
32 #include <2geom/rect.h>
33 #include "helper/geom.h"
34 #include <io/sys.h>
36 #include <string>
37 #include <stdio.h>
38 #include <stdarg.h>
41 namespace Inkscape
42 {
43 namespace Extension
44 {
45 namespace Internal
46 {
51 //########################################################################
52 //# U T I L I T Y
53 //########################################################################
57 /**
58 * This function searches the Repr tree recursively from the given node,
59 * and adds refs to all nodes with the given name, to the result vector
60 */
61 static void
62 findElementsByTagName(std::vector<Inkscape::XML::Node *> &results,
63 Inkscape::XML::Node *node,
64 char const *name)
65 {
66 if ( !name || strcmp(node->name(), name) == 0 )
67 results.push_back(node);
69 for (Inkscape::XML::Node *child = node->firstChild() ; child ;
70 child = child->next())
71 findElementsByTagName( results, child, name );
73 }
79 static double
80 effective_opacity(SPItem const *item)
81 {
82 double ret = 1.0;
83 for (SPObject const *obj = item; obj; obj = obj->parent)
84 {
85 SPStyle const *const style = SP_OBJECT_STYLE(obj);
86 g_return_val_if_fail(style, ret);
87 ret *= SP_SCALE24_TO_FLOAT(style->opacity.value);
88 }
89 return ret;
90 }
96 //########################################################################
97 //# OUTPUT FORMATTING
98 //########################################################################
101 /**
102 * We want to control floating output format
103 */
104 static PovOutput::String dstr(double d)
105 {
106 char dbuf[G_ASCII_DTOSTR_BUF_SIZE+1];
107 g_ascii_formatd(dbuf, G_ASCII_DTOSTR_BUF_SIZE,
108 "%.8f", (gdouble)d);
109 PovOutput::String s = dbuf;
110 return s;
111 }
116 /**
117 * Output data to the buffer, printf()-style
118 */
119 void PovOutput::out(const char *fmt, ...)
120 {
121 va_list args;
122 va_start(args, fmt);
123 gchar *output = g_strdup_vprintf(fmt, args);
124 va_end(args);
125 outbuf.append(output);
126 g_free(output);
127 }
133 /**
134 * Output a 2d vector
135 */
136 void PovOutput::vec2(double a, double b)
137 {
138 out("<%s, %s>", dstr(a).c_str(), dstr(b).c_str());
139 }
143 /**
144 * Output a 3d vector
145 */
146 void PovOutput::vec3(double a, double b, double c)
147 {
148 out("<%s, %s, %s>", dstr(a).c_str(), dstr(b).c_str(), dstr(c).c_str());
149 }
153 /**
154 * Output a v4d ector
155 */
156 void PovOutput::vec4(double a, double b, double c, double d)
157 {
158 out("<%s, %s, %s, %s>", dstr(a).c_str(), dstr(b).c_str(),
159 dstr(c).c_str(), dstr(d).c_str());
160 }
164 /**
165 * Output an rgbf color vector
166 */
167 void PovOutput::rgbf(double r, double g, double b, double f)
168 {
169 //"rgbf < %1.3f, %1.3f, %1.3f %1.3f>"
170 out("rgbf ");
171 vec4(r, g, b, f);
172 }
176 /**
177 * Output one bezier's start, start-control, end-control, and end nodes
178 */
179 void PovOutput::segment(int segNr,
180 double startX, double startY,
181 double startCtrlX, double startCtrlY,
182 double endCtrlX, double endCtrlY,
183 double endX, double endY)
184 {
185 //" /*%4d*/ <%f, %f>, <%f, %f>, <%f,%f>, <%f,%f>"
186 out(" /*%4d*/ ", segNr);
187 vec2(startX, startY);
188 out(", ");
189 vec2(startCtrlX, startCtrlY);
190 out(", ");
191 vec2(endCtrlX, endCtrlY);
192 out(", ");
193 vec2(endX, endY);
194 }
200 /**
201 * Output the file header
202 */
203 void PovOutput::doHeader()
204 {
205 time_t tim = time(NULL);
206 out("/*###################################################################\n");
207 out("### This PovRay document was generated by Inkscape\n");
208 out("### http://www.inkscape.org\n");
209 out("### Created: %s", ctime(&tim));
210 out("### Version: %s\n", INKSCAPE_VERSION);
211 out("#####################################################################\n");
212 out("### NOTES:\n");
213 out("### ============\n");
214 out("### POVRay information can be found at\n");
215 out("### http://www.povray.org\n");
216 out("###\n");
217 out("### The 'AllShapes' objects at the bottom are provided as a\n");
218 out("### preview of how the output would look in a trace. However,\n");
219 out("### the main intent of this file is to provide the individual\n");
220 out("### shapes for inclusion in a POV project.\n");
221 out("###\n");
222 out("### For an example of how to use this file, look at\n");
223 out("### share/examples/istest.pov\n");
224 out("###\n");
225 out("### If you have any problems with this output, please see the\n");
226 out("### Inkscape project at http://www.inkscape.org, or visit\n");
227 out("### the #inkscape channel on irc.freenode.net . \n");
228 out("###\n");
229 out("###################################################################*/\n");
230 out("\n\n");
231 out("/*###################################################################\n");
232 out("## Exports in this file\n");
233 out("##==========================\n");
234 out("## Shapes : %d\n", nrShapes);
235 out("## Segments : %d\n", nrSegments);
236 out("## Nodes : %d\n", nrNodes);
237 out("###################################################################*/\n");
238 out("\n\n\n");
239 }
243 /**
244 * Output the file footer
245 */
246 void PovOutput::doTail()
247 {
248 out("\n\n");
249 out("/*###################################################################\n");
250 out("### E N D F I L E\n");
251 out("###################################################################*/\n");
252 out("\n\n");
253 }
257 /**
258 * Output the curve data to buffer
259 */
260 void PovOutput::doCurves(SPDocument *doc)
261 {
262 using Geom::X;
263 using Geom::Y;
265 std::vector<Inkscape::XML::Node *>results;
266 //findElementsByTagName(results, SP_ACTIVE_DOCUMENT->rroot, "path");
267 findElementsByTagName(results, SP_ACTIVE_DOCUMENT->rroot, NULL);
268 if (results.size() == 0)
269 return;
271 double bignum = 1000000.0;
272 double minx = bignum;
273 double maxx = -bignum;
274 double miny = bignum;
275 double maxy = -bignum;
277 for (unsigned int indx = 0; indx < results.size() ; indx++)
278 {
279 //### Fetch the object from the repr info
280 Inkscape::XML::Node *rpath = results[indx];
281 char *str = (char *) rpath->attribute("id");
282 if (!str)
283 continue;
285 String id = str;
286 SPObject *reprobj = SP_ACTIVE_DOCUMENT->getObjectByRepr(rpath);
287 if (!reprobj)
288 continue;
290 //### Get the transform of the item
291 if (!SP_IS_ITEM(reprobj))
292 continue;
294 SPItem *item = SP_ITEM(reprobj);
295 Geom::Matrix tf = sp_item_i2d_affine(item);
297 //### Get the Shape
298 if (!SP_IS_SHAPE(reprobj))//Bulia's suggestion. Allow all shapes
299 continue;
301 SPShape *shape = SP_SHAPE(reprobj);
302 SPCurve *curve = shape->curve;
303 if (curve->is_empty())
304 continue;
306 nrShapes++;
308 PovShapeInfo shapeInfo;
309 shapeInfo.id = id;
310 shapeInfo.color = "";
312 //Try to get the fill color of the shape
313 SPStyle *style = SP_OBJECT_STYLE(shape);
314 /* fixme: Handle other fill types, even if this means translating gradients to a single
315 flat colour. */
316 if (style && (style->fill.isColor()))
317 {
318 // see color.h for how to parse SPColor
319 float rgb[3];
320 sp_color_get_rgb_floatv(&style->fill.value.color, rgb);
321 double const dopacity = ( SP_SCALE24_TO_FLOAT(style->fill_opacity.value)
322 * effective_opacity(shape) );
323 //gchar *str = g_strdup_printf("rgbf < %1.3f, %1.3f, %1.3f %1.3f>",
324 // rgb[0], rgb[1], rgb[2], 1.0 - dopacity);
325 String rgbf = "rgbf <";
326 rgbf.append(dstr(rgb[0])); rgbf.append(", ");
327 rgbf.append(dstr(rgb[1])); rgbf.append(", ");
328 rgbf.append(dstr(rgb[2])); rgbf.append(", ");
329 rgbf.append(dstr(1.0 - dopacity)); rgbf.append(">");
330 shapeInfo.color += rgbf;
331 }
333 povShapes.push_back(shapeInfo); //passed all tests. save the info
335 // convert the path to only lineto's and cubic curveto's:
336 Geom::PathVector pathv = pathv_to_linear_and_cubic_beziers( curve->get_pathvector() * tf );
338 //Count the NR_CURVETOs/LINETOs (including closing line segment)
339 guint segmentCount = 0;
340 for(Geom::PathVector::const_iterator it = pathv.begin(); it != pathv.end(); ++it) {
341 segmentCount += (*it).size();
342 if (it->closed())
343 segmentCount += 1;
344 }
346 out("/*###################################################\n");
347 out("### PRISM: %s\n", id.c_str());
348 out("###################################################*/\n");
349 out("#declare %s = prism {\n", id.c_str());
350 out(" linear_sweep\n");
351 out(" bezier_spline\n");
352 out(" 1.0, //top\n");
353 out(" 0.0, //bottom\n");
354 out(" %d //nr points\n", segmentCount * 4);
355 int segmentNr = 0;
357 nrSegments += segmentCount;
359 Geom::Rect cminmax( pathv.front().initialPoint(), pathv.front().initialPoint() ); // at moment of writing, 2geom lacks proper initialization of empty intervals in rect...
360 for (Geom::PathVector::const_iterator pit = pathv.begin(); pit != pathv.end(); ++pit) {
362 cminmax.expandTo(pit->initialPoint());
364 for (Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_closed(); ++cit) {
366 if( dynamic_cast<Geom::LineSegment const *> (&*cit) ||
367 dynamic_cast<Geom::HLineSegment const *>(&*cit) ||
368 dynamic_cast<Geom::VLineSegment const *>(&*cit) )
369 {
370 segment(segmentNr++,
371 cit->initialPoint()[X], cit->initialPoint()[Y], cit->initialPoint()[X], cit->initialPoint()[Y],
372 cit->finalPoint()[X], cit->finalPoint()[Y], cit->finalPoint()[X], cit->finalPoint()[Y] );
373 nrNodes += 8;
374 }
375 else if(Geom::CubicBezier const *cubic = dynamic_cast<Geom::CubicBezier const*>(&*cit)) {
376 std::vector<Geom::Point> points = cubic->points();
377 segment(segmentNr++,
378 points[0][X],points[0][Y], points[1][X],points[1][Y], points[2][X],points[2][Y], points[3][X],points[3][Y]);
379 nrNodes += 8;
380 }
381 else {
382 g_error ("logical error, because pathv_to_linear_and_cubic_beziers was used");
383 }
385 if (segmentNr <= segmentCount)
386 out(",\n");
387 else
388 out("\n");
390 cminmax.expandTo(cit->finalPoint());
392 }
393 }
395 out("}\n");
397 double cminx = cminmax.min()[X];
398 double cmaxx = cminmax.max()[X];
399 double cminy = cminmax.min()[Y];
400 double cmaxy = cminmax.max()[Y];
402 //# prefix for following declarations
403 char *pfx = (char *)id.c_str();
405 out("#declare %s_MIN_X = %s;\n", pfx, dstr(cminx).c_str());
406 out("#declare %s_CENTER_X = %s;\n", pfx, dstr((cmaxx+cminx)/2.0).c_str());
407 out("#declare %s_MAX_X = %s;\n", pfx, dstr(cmaxx).c_str());
408 out("#declare %s_WIDTH = %s;\n", pfx, dstr(cmaxx-cminx).c_str());
409 out("#declare %s_MIN_Y = %s;\n", pfx, dstr(cminy).c_str());
410 out("#declare %s_CENTER_Y = %s;\n", pfx, dstr((cmaxy+cminy)/2.0).c_str());
411 out("#declare %s_MAX_Y = %s;\n", pfx, dstr(cmaxy).c_str());
412 out("#declare %s_HEIGHT = %s;\n", pfx, dstr(cmaxy-cminy).c_str());
413 if (shapeInfo.color.length()>0)
414 out("#declare %s_COLOR = %s;\n",
415 pfx, shapeInfo.color.c_str());
416 out("/*###################################################\n");
417 out("### end %s\n", id.c_str());
418 out("###################################################*/\n\n\n\n");
419 if (cminx < minx)
420 minx = cminx;
421 if (cmaxx > maxx)
422 maxx = cmaxx;
423 if (cminy < miny)
424 miny = cminy;
425 if (cmaxy > maxy)
426 maxy = cmaxy;
428 }//for
432 //## Let's make a union of all of the Shapes
433 if (povShapes.size()>0)
434 {
435 String id = "AllShapes";
436 char *pfx = (char *)id.c_str();
437 out("/*###################################################\n");
438 out("### UNION OF ALL SHAPES IN DOCUMENT\n");
439 out("###################################################*/\n");
440 out("\n\n");
441 out("/**\n");
442 out(" * Allow the user to redefine the finish{}\n");
443 out(" * by declaring it before #including this file\n");
444 out(" */\n");
445 out("#ifndef (%s_Finish)\n", pfx);
446 out("#declare %s_Finish = finish {\n", pfx);
447 out(" phong 0.5\n");
448 out(" reflection 0.3\n");
449 out(" specular 0.5\n");
450 out("}\n");
451 out("#end\n");
452 out("\n\n");
453 out("#declare %s = union {\n", id.c_str());
454 for (unsigned i = 0 ; i < povShapes.size() ; i++)
455 {
456 out(" object { %s\n", povShapes[i].id.c_str());
457 out(" texture { \n");
458 if (povShapes[i].color.length()>0)
459 out(" pigment { %s }\n", povShapes[i].color.c_str());
460 else
461 out(" pigment { rgb <0,0,0> }\n");
462 out(" finish { %s_Finish }\n", pfx);
463 out(" } \n");
464 out(" } \n");
465 }
466 out("}\n\n\n\n");
469 double zinc = 0.2 / (double)povShapes.size();
470 out("/*#### Same union, but with Z-diffs (actually Y in pov) ####*/\n");
471 out("\n\n");
472 out("/**\n");
473 out(" * Allow the user to redefine the Z-Increment\n");
474 out(" */\n");
475 out("#ifndef (AllShapes_Z_Increment)\n");
476 out("#declare AllShapes_Z_Increment = %s;\n", dstr(zinc).c_str());
477 out("#end\n");
478 out("\n");
479 out("#declare AllShapes_Z_Scale = 1.0;\n");
480 out("\n\n");
481 out("#declare %s_Z = union {\n", pfx);
483 for (unsigned i = 0 ; i < povShapes.size() ; i++)
484 {
485 out(" object { %s\n", povShapes[i].id.c_str());
486 out(" texture { \n");
487 if (povShapes[i].color.length()>0)
488 out(" pigment { %s }\n", povShapes[i].color.c_str());
489 else
490 out(" pigment { rgb <0,0,0> }\n");
491 out(" finish { %s_Finish }\n", pfx);
492 out(" } \n");
493 out(" scale <1, %s_Z_Scale, 1>\n", pfx);
494 out(" } \n");
495 out("#declare %s_Z_Scale = %s_Z_Scale + %s_Z_Increment;\n\n",
496 pfx, pfx, pfx);
497 }
499 out("}\n");
501 out("#declare %s_MIN_X = %s;\n", pfx, dstr(minx).c_str());
502 out("#declare %s_CENTER_X = %s;\n", pfx, dstr((maxx+minx)/2.0).c_str());
503 out("#declare %s_MAX_X = %s;\n", pfx, dstr(maxx).c_str());
504 out("#declare %s_WIDTH = %s;\n", pfx, dstr(maxx-minx).c_str());
505 out("#declare %s_MIN_Y = %s;\n", pfx, dstr(miny).c_str());
506 out("#declare %s_CENTER_Y = %s;\n", pfx, dstr((maxy+miny)/2.0).c_str());
507 out("#declare %s_MAX_Y = %s;\n", pfx, dstr(maxy).c_str());
508 out("#declare %s_HEIGHT = %s;\n", pfx, dstr(maxy-miny).c_str());
509 out("/*##############################################\n");
510 out("### end %s\n", id.c_str());
511 out("##############################################*/\n");
512 out("\n\n");
513 }
515 }
520 //########################################################################
521 //# M A I N O U T P U T
522 //########################################################################
526 /**
527 * Set values back to initial state
528 */
529 void PovOutput::reset()
530 {
531 nrNodes = 0;
532 nrSegments = 0;
533 nrShapes = 0;
534 outbuf.clear();
535 povShapes.clear();
536 }
540 /**
541 * Saves the <paths> of an Inkscape SVG file as PovRay spline definitions
542 */
543 void PovOutput::saveDocument(SPDocument *doc, gchar const *uri)
544 {
545 reset();
547 //###### SAVE IN POV FORMAT TO BUFFER
548 //# Lets do the curves first, to get the stats
549 doCurves(doc);
550 String curveBuf = outbuf;
551 outbuf.clear();
553 doHeader();
555 outbuf.append(curveBuf);
557 doTail();
562 //###### WRITE TO FILE
563 Inkscape::IO::dump_fopen_call(uri, "L");
564 FILE *f = Inkscape::IO::fopen_utf8name(uri, "w");
565 if (!f)
566 return;
568 for (String::iterator iter = outbuf.begin() ; iter!=outbuf.end(); iter++)
569 {
570 int ch = *iter;
571 fputc(ch, f);
572 }
574 fclose(f);
575 }
580 //########################################################################
581 //# EXTENSION API
582 //########################################################################
586 #include "clear-n_.h"
590 /**
591 * API call to save document
592 */
593 void
594 PovOutput::save(Inkscape::Extension::Output *mod,
595 SPDocument *doc, gchar const *uri)
596 {
597 saveDocument(doc, uri);
598 }
602 /**
603 * Make sure that we are in the database
604 */
605 bool PovOutput::check (Inkscape::Extension::Extension *module)
606 {
607 /* We don't need a Key
608 if (NULL == Inkscape::Extension::db.get(SP_MODULE_KEY_OUTPUT_POV))
609 return FALSE;
610 */
612 return true;
613 }
617 /**
618 * This is the definition of PovRay output. This function just
619 * calls the extension system with the memory allocated XML that
620 * describes the data.
621 */
622 void
623 PovOutput::init()
624 {
625 Inkscape::Extension::build_from_mem(
626 "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
627 "<name>" N_("PovRay Output") "</name>\n"
628 "<id>org.inkscape.output.pov</id>\n"
629 "<output>\n"
630 "<extension>.pov</extension>\n"
631 "<mimetype>text/x-povray-script</mimetype>\n"
632 "<filetypename>" N_("PovRay (*.pov) (export splines)") "</filetypename>\n"
633 "<filetypetooltip>" N_("PovRay Raytracer File") "</filetypetooltip>\n"
634 "</output>\n"
635 "</inkscape-extension>",
636 new PovOutput());
637 }
643 } // namespace Internal
644 } // namespace Extension
645 } // namespace Inkscape
648 /*
649 Local Variables:
650 mode:c++
651 c-file-style:"stroustrup"
652 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
653 indent-tabs-mode:nil
654 fill-column:99
655 End:
656 */
657 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :