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 <extension/system.h>
30 #include <2geom/pathvector.h>
31 #include <2geom/rect.h>
32 #include <2geom/bezier-curve.h>
33 #include <2geom/hvlinesegment.h>
34 #include "helper/geom.h"
35 #include "helper/geom-curves.h"
36 #include <io/sys.h>
38 #include <string>
39 #include <stdio.h>
40 #include <stdarg.h>
43 namespace Inkscape
44 {
45 namespace Extension
46 {
47 namespace Internal
48 {
51 //########################################################################
52 //# M E S S A G E S
53 //########################################################################
55 static void err(const char *fmt, ...)
56 {
57 va_list args;
58 g_log(NULL, G_LOG_LEVEL_WARNING, "Pov-out err: ");
59 va_start(args, fmt);
60 g_logv(NULL, G_LOG_LEVEL_WARNING, fmt, args);
61 va_end(args);
62 g_log(NULL, G_LOG_LEVEL_WARNING, "\n");
63 }
68 //########################################################################
69 //# U T I L I T Y
70 //########################################################################
74 static double
75 effective_opacity(SPItem const *item)
76 {
77 double ret = 1.0;
78 for (SPObject const *obj = item; obj; obj = obj->parent)
79 {
80 SPStyle const *const style = SP_OBJECT_STYLE(obj);
81 g_return_val_if_fail(style, ret);
82 ret *= SP_SCALE24_TO_FLOAT(style->opacity.value);
83 }
84 return ret;
85 }
91 //########################################################################
92 //# OUTPUT FORMATTING
93 //########################################################################
96 /**
97 * We want to control floating output format
98 */
99 static PovOutput::String dstr(double d)
100 {
101 char dbuf[G_ASCII_DTOSTR_BUF_SIZE+1];
102 g_ascii_formatd(dbuf, G_ASCII_DTOSTR_BUF_SIZE,
103 "%.8f", (gdouble)d);
104 PovOutput::String s = dbuf;
105 return s;
106 }
108 #define DSTR(d) (dstr(d).c_str())
111 /**
112 * Output data to the buffer, printf()-style
113 */
114 void PovOutput::out(const char *fmt, ...)
115 {
116 va_list args;
117 va_start(args, fmt);
118 gchar *output = g_strdup_vprintf(fmt, args);
119 va_end(args);
120 outbuf.append(output);
121 g_free(output);
122 }
128 /**
129 * Output a 2d vector
130 */
131 void PovOutput::vec2(double a, double b)
132 {
133 out("<%s, %s>", DSTR(a), DSTR(b));
134 }
138 /**
139 * Output a 3d vector
140 */
141 void PovOutput::vec3(double a, double b, double c)
142 {
143 out("<%s, %s, %s>", DSTR(a), DSTR(b), DSTR(c));
144 }
148 /**
149 * Output a v4d ector
150 */
151 void PovOutput::vec4(double a, double b, double c, double d)
152 {
153 out("<%s, %s, %s, %s>", DSTR(a), DSTR(b), DSTR(c), DSTR(d));
154 }
158 /**
159 * Output an rgbf color vector
160 */
161 void PovOutput::rgbf(double r, double g, double b, double f)
162 {
163 //"rgbf < %1.3f, %1.3f, %1.3f %1.3f>"
164 out("rgbf ");
165 vec4(r, g, b, f);
166 }
170 /**
171 * Output one bezier's start, start-control, end-control, and end nodes
172 */
173 void PovOutput::segment(int segNr,
174 double startX, double startY,
175 double startCtrlX, double startCtrlY,
176 double endCtrlX, double endCtrlY,
177 double endX, double endY)
178 {
179 //" /*%4d*/ <%f, %f>, <%f, %f>, <%f,%f>, <%f,%f>"
180 out(" /*%4d*/ ", segNr);
181 vec2(startX, startY);
182 out(", ");
183 vec2(startCtrlX, startCtrlY);
184 out(", ");
185 vec2(endCtrlX, endCtrlY);
186 out(", ");
187 vec2(endX, endY);
188 }
194 /**
195 * Output the file header
196 */
197 bool PovOutput::doHeader()
198 {
199 time_t tim = time(NULL);
200 out("/*###################################################################\n");
201 out("### This PovRay document was generated by Inkscape\n");
202 out("### http://www.inkscape.org\n");
203 out("### Created: %s", ctime(&tim));
204 out("### Version: %s\n", INKSCAPE_VERSION);
205 out("#####################################################################\n");
206 out("### NOTES:\n");
207 out("### ============\n");
208 out("### POVRay information can be found at\n");
209 out("### http://www.povray.org\n");
210 out("###\n");
211 out("### The 'AllShapes' objects at the bottom are provided as a\n");
212 out("### preview of how the output would look in a trace. However,\n");
213 out("### the main intent of this file is to provide the individual\n");
214 out("### shapes for inclusion in a POV project.\n");
215 out("###\n");
216 out("### For an example of how to use this file, look at\n");
217 out("### share/examples/istest.pov\n");
218 out("###\n");
219 out("### If you have any problems with this output, please see the\n");
220 out("### Inkscape project at http://www.inkscape.org, or visit\n");
221 out("### the #inkscape channel on irc.freenode.net . \n");
222 out("###\n");
223 out("###################################################################*/\n");
224 out("\n\n");
225 out("/*###################################################################\n");
226 out("## Exports in this file\n");
227 out("##==========================\n");
228 out("## Shapes : %d\n", nrShapes);
229 out("## Segments : %d\n", nrSegments);
230 out("## Nodes : %d\n", nrNodes);
231 out("###################################################################*/\n");
232 out("\n\n\n");
233 return true;
234 }
238 /**
239 * Output the file footer
240 */
241 bool PovOutput::doTail()
242 {
243 out("\n\n");
244 out("/*###################################################################\n");
245 out("### E N D F I L E\n");
246 out("###################################################################*/\n");
247 out("\n\n");
248 return true;
249 }
253 /**
254 * Output the curve data to buffer
255 */
256 bool PovOutput::doCurve(SPItem *item, const String &id)
257 {
258 using Geom::X;
259 using Geom::Y;
261 //### Get the Shape
262 if (!SP_IS_SHAPE(item))//Bulia's suggestion. Allow all shapes
263 return true;
265 SPShape *shape = SP_SHAPE(item);
266 SPCurve *curve = shape->curve;
267 if (curve->is_empty())
268 return true;
270 nrShapes++;
272 PovShapeInfo shapeInfo;
273 shapeInfo.id = id;
274 shapeInfo.color = "";
276 //Try to get the fill color of the shape
277 SPStyle *style = SP_OBJECT_STYLE(shape);
278 /* fixme: Handle other fill types, even if this means translating gradients to a single
279 flat colour. */
280 if (style)
281 {
282 if (style->fill.isColor())
283 {
284 // see color.h for how to parse SPColor
285 float rgb[3];
286 sp_color_get_rgb_floatv(&style->fill.value.color, rgb);
287 double const dopacity = ( SP_SCALE24_TO_FLOAT(style->fill_opacity.value)
288 * effective_opacity(shape) );
289 //gchar *str = g_strdup_printf("rgbf < %1.3f, %1.3f, %1.3f %1.3f>",
290 // rgb[0], rgb[1], rgb[2], 1.0 - dopacity);
291 String rgbf = "rgbf <";
292 rgbf.append(dstr(rgb[0])); rgbf.append(", ");
293 rgbf.append(dstr(rgb[1])); rgbf.append(", ");
294 rgbf.append(dstr(rgb[2])); rgbf.append(", ");
295 rgbf.append(dstr(1.0 - dopacity)); rgbf.append(">");
296 shapeInfo.color += rgbf;
297 }
298 }
300 povShapes.push_back(shapeInfo); //passed all tests. save the info
302 // convert the path to only lineto's and cubic curveto's:
303 Geom::Matrix tf = sp_item_i2d_affine(item);
304 Geom::PathVector pathv = pathv_to_linear_and_cubic_beziers( curve->get_pathvector() * tf );
306 //Count the NR_CURVETOs/LINETOs (including closing line segment)
307 int segmentCount = 0;
308 for(Geom::PathVector::const_iterator it = pathv.begin(); it != pathv.end(); ++it)
309 {
310 segmentCount += (*it).size();
311 if (it->closed())
312 segmentCount += 1;
313 }
315 out("/*###################################################\n");
316 out("### PRISM: %s\n", id.c_str());
317 out("###################################################*/\n");
318 out("#declare %s = prism {\n", id.c_str());
319 out(" linear_sweep\n");
320 out(" bezier_spline\n");
321 out(" 1.0, //top\n");
322 out(" 0.0, //bottom\n");
323 out(" %d //nr points\n", segmentCount * 4);
324 int segmentNr = 0;
326 nrSegments += segmentCount;
328 /**
329 * at moment of writing, 2geom lacks proper initialization of empty intervals in rect...
330 */
331 Geom::Rect cminmax( pathv.front().initialPoint(), pathv.front().initialPoint() );
334 /**
335 * For all Subpaths in the <path>
336 */
337 for (Geom::PathVector::const_iterator pit = pathv.begin(); pit != pathv.end(); ++pit)
338 {
340 cminmax.expandTo(pit->initialPoint());
342 /**
343 * For all segments in the subpath
344 */
345 for (Geom::Path::const_iterator cit = pit->begin(); cit != pit->end_closed(); ++cit)
346 {
348 if( is_straight_curve(*cit) )
349 {
350 Geom::Point p0 = cit->initialPoint();
351 Geom::Point p1 = cit->finalPoint();
352 segment(segmentNr++,
353 p0[X], p0[Y], p0[X], p0[Y], p1[X], p1[Y], p1[X], p1[Y] );
354 nrNodes += 8;
355 }
356 else if(Geom::CubicBezier const *cubic = dynamic_cast<Geom::CubicBezier const*>(&*cit))
357 {
358 std::vector<Geom::Point> points = cubic->points();
359 Geom::Point p0 = points[0];
360 Geom::Point p1 = points[1];
361 Geom::Point p2 = points[2];
362 Geom::Point p3 = points[3];
363 segment(segmentNr++,
364 p0[X],p0[Y], p1[X],p1[Y], p2[X],p2[Y], p3[X],p3[Y]);
365 nrNodes += 8;
366 }
367 else
368 {
369 err("logical error, because pathv_to_linear_and_cubic_beziers was used");
370 return false;
371 }
373 if (segmentNr < segmentCount)
374 out(",\n");
375 else
376 out("\n");
378 cminmax.expandTo(cit->finalPoint());
380 }
381 }
383 out("}\n");
385 double cminx = cminmax.min()[X];
386 double cmaxx = cminmax.max()[X];
387 double cminy = cminmax.min()[Y];
388 double cmaxy = cminmax.max()[Y];
390 out("#declare %s_MIN_X = %s;\n", id.c_str(), DSTR(cminx));
391 out("#declare %s_CENTER_X = %s;\n", id.c_str(), DSTR((cmaxx+cminx)/2.0));
392 out("#declare %s_MAX_X = %s;\n", id.c_str(), DSTR(cmaxx));
393 out("#declare %s_WIDTH = %s;\n", id.c_str(), DSTR(cmaxx-cminx));
394 out("#declare %s_MIN_Y = %s;\n", id.c_str(), DSTR(cminy));
395 out("#declare %s_CENTER_Y = %s;\n", id.c_str(), DSTR((cmaxy+cminy)/2.0));
396 out("#declare %s_MAX_Y = %s;\n", id.c_str(), DSTR(cmaxy));
397 out("#declare %s_HEIGHT = %s;\n", id.c_str(), DSTR(cmaxy-cminy));
398 if (shapeInfo.color.length()>0)
399 out("#declare %s_COLOR = %s;\n",
400 id.c_str(), shapeInfo.color.c_str());
401 out("/*###################################################\n");
402 out("### end %s\n", id.c_str());
403 out("###################################################*/\n\n\n\n");
405 if (cminx < minx)
406 minx = cminx;
407 if (cmaxx > maxx)
408 maxx = cmaxx;
409 if (cminy < miny)
410 miny = cminy;
411 if (cmaxy > maxy)
412 maxy = cmaxy;
414 return true;
415 }
417 /**
418 * Descend the svg tree recursively, translating data
419 */
420 bool PovOutput::doTreeRecursive(SPDocument *doc, SPObject *obj)
421 {
423 String id;
424 if (!obj->id)
425 {
426 char buf[16];
427 sprintf(buf, "id%d", idIndex++);
428 id = buf;
429 }
430 else
431 {
432 id = obj->id;
433 }
435 if (SP_IS_ITEM(obj))
436 {
437 SPItem *item = SP_ITEM(obj);
438 if (!doCurve(item, id))
439 return false;
440 }
442 /**
443 * Descend into children
444 */
445 for (SPObject *child = obj->firstChild() ; child ; child = child->next)
446 {
447 if (!doTreeRecursive(doc, child))
448 return false;
449 }
451 return true;
452 }
454 /**
455 * Output the curve data to buffer
456 */
457 bool PovOutput::doTree(SPDocument *doc)
458 {
459 double bignum = 1000000.0;
460 minx = bignum;
461 maxx = -bignum;
462 miny = bignum;
463 maxy = -bignum;
465 if (!doTreeRecursive(doc, doc->root))
466 return false;
468 //## Let's make a union of all of the Shapes
469 if (povShapes.size()>0)
470 {
471 String id = "AllShapes";
472 char *pfx = (char *)id.c_str();
473 out("/*###################################################\n");
474 out("### UNION OF ALL SHAPES IN DOCUMENT\n");
475 out("###################################################*/\n");
476 out("\n\n");
477 out("/**\n");
478 out(" * Allow the user to redefine the finish{}\n");
479 out(" * by declaring it before #including this file\n");
480 out(" */\n");
481 out("#ifndef (%s_Finish)\n", pfx);
482 out("#declare %s_Finish = finish {\n", pfx);
483 out(" phong 0.5\n");
484 out(" reflection 0.3\n");
485 out(" specular 0.5\n");
486 out("}\n");
487 out("#end\n");
488 out("\n\n");
489 out("#declare %s = union {\n", id.c_str());
490 for (unsigned i = 0 ; i < povShapes.size() ; i++)
491 {
492 out(" object { %s\n", povShapes[i].id.c_str());
493 out(" texture { \n");
494 if (povShapes[i].color.length()>0)
495 out(" pigment { %s }\n", povShapes[i].color.c_str());
496 else
497 out(" pigment { rgb <0,0,0> }\n");
498 out(" finish { %s_Finish }\n", pfx);
499 out(" } \n");
500 out(" } \n");
501 }
502 out("}\n\n\n\n");
505 double zinc = 0.2 / (double)povShapes.size();
506 out("/*#### Same union, but with Z-diffs (actually Y in pov) ####*/\n");
507 out("\n\n");
508 out("/**\n");
509 out(" * Allow the user to redefine the Z-Increment\n");
510 out(" */\n");
511 out("#ifndef (AllShapes_Z_Increment)\n");
512 out("#declare AllShapes_Z_Increment = %s;\n", DSTR(zinc));
513 out("#end\n");
514 out("\n");
515 out("#declare AllShapes_Z_Scale = 1.0;\n");
516 out("\n\n");
517 out("#declare %s_Z = union {\n", pfx);
519 for (unsigned i = 0 ; i < povShapes.size() ; i++)
520 {
521 out(" object { %s\n", povShapes[i].id.c_str());
522 out(" texture { \n");
523 if (povShapes[i].color.length()>0)
524 out(" pigment { %s }\n", povShapes[i].color.c_str());
525 else
526 out(" pigment { rgb <0,0,0> }\n");
527 out(" finish { %s_Finish }\n", pfx);
528 out(" } \n");
529 out(" scale <1, %s_Z_Scale, 1>\n", pfx);
530 out(" } \n");
531 out("#declare %s_Z_Scale = %s_Z_Scale + %s_Z_Increment;\n\n",
532 pfx, pfx, pfx);
533 }
535 out("}\n");
537 out("#declare %s_MIN_X = %s;\n", pfx, DSTR(minx));
538 out("#declare %s_CENTER_X = %s;\n", pfx, DSTR((maxx+minx)/2.0));
539 out("#declare %s_MAX_X = %s;\n", pfx, DSTR(maxx));
540 out("#declare %s_WIDTH = %s;\n", pfx, DSTR(maxx-minx));
541 out("#declare %s_MIN_Y = %s;\n", pfx, DSTR(miny));
542 out("#declare %s_CENTER_Y = %s;\n", pfx, DSTR((maxy+miny)/2.0));
543 out("#declare %s_MAX_Y = %s;\n", pfx, DSTR(maxy));
544 out("#declare %s_HEIGHT = %s;\n", pfx, DSTR(maxy-miny));
545 out("/*##############################################\n");
546 out("### end %s\n", id.c_str());
547 out("##############################################*/\n");
548 out("\n\n");
549 }
551 return true;
552 }
555 //########################################################################
556 //# M A I N O U T P U T
557 //########################################################################
561 /**
562 * Set values back to initial state
563 */
564 void PovOutput::reset()
565 {
566 nrNodes = 0;
567 nrSegments = 0;
568 nrShapes = 0;
569 idIndex = 0;
570 outbuf.clear();
571 povShapes.clear();
572 }
576 /**
577 * Saves the Shapes of an Inkscape SVG file as PovRay spline definitions
578 */
579 void PovOutput::saveDocument(SPDocument *doc, gchar const *uri)
580 {
581 reset();
583 //###### SAVE IN POV FORMAT TO BUFFER
584 //# Lets do the curves first, to get the stats
585 if (!doTree(doc))
586 {
587 err("Could not output curves for %s", uri);
588 return;
589 }
591 String curveBuf = outbuf;
592 outbuf.clear();
594 if (!doHeader())
595 {
596 err("Could not write header for %s", uri);
597 return;
598 }
600 outbuf.append(curveBuf);
602 if (!doTail())
603 {
604 err("Could not write footer for %s", uri);
605 return;
606 }
611 //###### WRITE TO FILE
612 Inkscape::IO::dump_fopen_call(uri, "L");
613 FILE *f = Inkscape::IO::fopen_utf8name(uri, "w");
614 if (!f)
615 return;
617 for (String::iterator iter = outbuf.begin() ; iter!=outbuf.end(); iter++)
618 {
619 int ch = *iter;
620 fputc(ch, f);
621 }
623 fclose(f);
624 }
629 //########################################################################
630 //# EXTENSION API
631 //########################################################################
635 #include "clear-n_.h"
639 /**
640 * API call to save document
641 */
642 void
643 PovOutput::save(Inkscape::Extension::Output */*mod*/,
644 SPDocument *doc, gchar const *uri)
645 {
646 saveDocument(doc, uri);
647 }
651 /**
652 * Make sure that we are in the database
653 */
654 bool PovOutput::check (Inkscape::Extension::Extension */*module*/)
655 {
656 /* We don't need a Key
657 if (NULL == Inkscape::Extension::db.get(SP_MODULE_KEY_OUTPUT_POV))
658 return FALSE;
659 */
661 return true;
662 }
666 /**
667 * This is the definition of PovRay output. This function just
668 * calls the extension system with the memory allocated XML that
669 * describes the data.
670 */
671 void
672 PovOutput::init()
673 {
674 Inkscape::Extension::build_from_mem(
675 "<inkscape-extension xmlns=\"" INKSCAPE_EXTENSION_URI "\">\n"
676 "<name>" N_("PovRay Output") "</name>\n"
677 "<id>org.inkscape.output.pov</id>\n"
678 "<output>\n"
679 "<extension>.pov</extension>\n"
680 "<mimetype>text/x-povray-script</mimetype>\n"
681 "<filetypename>" N_("PovRay (*.pov) (export splines)") "</filetypename>\n"
682 "<filetypetooltip>" N_("PovRay Raytracer File") "</filetypetooltip>\n"
683 "</output>\n"
684 "</inkscape-extension>",
685 new PovOutput());
686 }
692 } // namespace Internal
693 } // namespace Extension
694 } // namespace Inkscape
697 /*
698 Local Variables:
699 mode:c++
700 c-file-style:"stroustrup"
701 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
702 indent-tabs-mode:nil
703 fill-column:99
704 End:
705 */
706 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :