1 /*
2 * Base class for shapes, including <path> element
3 *
4 * Author:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 *
7 * Copyright (C) 1999-2002 Lauris Kaplinski
8 * Copyright (C) 2000-2001 Ximian, Inc.
9 * Copyright (C) 2004 John Cliff
10 * Copyright (C) 2007-2008 Johan Engelen
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 #ifdef HAVE_CONFIG_H
16 # include "config.h"
17 #endif
19 #include <libnr/nr-matrix-fns.h>
20 #include <libnr/nr-matrix-ops.h>
21 #include <libnr/nr-matrix-translate-ops.h>
22 #include <libnr/nr-scale-matrix-ops.h>
23 #include <2geom/rect.h>
24 #include <2geom/transforms.h>
25 #include <2geom/pathvector.h>
26 #include <2geom/path-intersection.h>
27 #include "helper/geom.h"
28 #include "helper/geom-nodetype.h"
30 #include <sigc++/functors/ptr_fun.h>
31 #include <sigc++/adaptors/bind.h>
33 #include "macros.h"
34 #include "display/nr-arena-shape.h"
35 #include "display/curve.h"
36 #include "print.h"
37 #include "document.h"
38 #include "style.h"
39 #include "marker.h"
40 #include "sp-path.h"
41 #include "preferences.h"
42 #include "attributes.h"
44 #include "live_effects/lpeobject.h"
45 #include "uri.h"
46 #include "extract-uri.h"
47 #include "uri-references.h"
48 #include "bad-uri-exception.h"
49 #include "xml/repr.h"
51 #include "util/mathfns.h" // for triangle_area()
53 #define noSHAPE_VERBOSE
55 static void sp_shape_class_init (SPShapeClass *klass);
56 static void sp_shape_init (SPShape *shape);
57 static void sp_shape_finalize (GObject *object);
59 static void sp_shape_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr);
60 static void sp_shape_release (SPObject *object);
62 static void sp_shape_set(SPObject *object, unsigned key, gchar const *value);
63 static void sp_shape_update (SPObject *object, SPCtx *ctx, unsigned int flags);
64 static void sp_shape_modified (SPObject *object, unsigned int flags);
65 static Inkscape::XML::Node *sp_shape_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);
67 static void sp_shape_bbox(SPItem const *item, NRRect *bbox, Geom::Matrix const &transform, unsigned const flags);
68 void sp_shape_print (SPItem * item, SPPrintContext * ctx);
69 static NRArenaItem *sp_shape_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags);
70 static void sp_shape_hide (SPItem *item, unsigned int key);
71 static void sp_shape_snappoints (SPItem const *item, std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs);
73 static void sp_shape_update_marker_view (SPShape *shape, NRArenaItem *ai);
75 static SPLPEItemClass *parent_class;
77 /**
78 * Registers the SPShape class with Gdk and returns its type number.
79 */
80 GType
81 sp_shape_get_type (void)
82 {
83 static GType type = 0;
84 if (!type) {
85 GTypeInfo info = {
86 sizeof (SPShapeClass),
87 NULL, NULL,
88 (GClassInitFunc) sp_shape_class_init,
89 NULL, NULL,
90 sizeof (SPShape),
91 16,
92 (GInstanceInitFunc) sp_shape_init,
93 NULL, /* value_table */
94 };
95 type = g_type_register_static (SP_TYPE_LPE_ITEM, "SPShape", &info, (GTypeFlags)0);
96 }
97 return type;
98 }
100 /**
101 * Initializes a SPShapeClass object. Establishes the function pointers to the class'
102 * member routines in the class vtable, and sets pointers to parent classes.
103 */
104 static void
105 sp_shape_class_init (SPShapeClass *klass)
106 {
107 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
108 SPObjectClass *sp_object_class = SP_OBJECT_CLASS(klass);
109 SPItemClass * item_class = SP_ITEM_CLASS(klass);
110 SPLPEItemClass * lpe_item_class = SP_LPE_ITEM_CLASS(klass);
112 parent_class = (SPLPEItemClass *)g_type_class_peek_parent (klass);
114 gobject_class->finalize = sp_shape_finalize;
116 sp_object_class->build = sp_shape_build;
117 sp_object_class->release = sp_shape_release;
118 sp_object_class->set = sp_shape_set;
119 sp_object_class->update = sp_shape_update;
120 sp_object_class->modified = sp_shape_modified;
121 sp_object_class->write = sp_shape_write;
123 item_class->bbox = sp_shape_bbox;
124 item_class->print = sp_shape_print;
125 item_class->show = sp_shape_show;
126 item_class->hide = sp_shape_hide;
127 item_class->snappoints = sp_shape_snappoints;
128 lpe_item_class->update_patheffect = NULL;
130 klass->set_shape = NULL;
131 }
133 /**
134 * Initializes an SPShape object.
135 */
136 static void
137 sp_shape_init (SPShape *shape)
138 {
139 for ( int i = 0 ; i < SP_MARKER_LOC_QTY ; i++ ) {
140 new (&shape->release_connect[i]) sigc::connection();
141 new (&shape->modified_connect[i]) sigc::connection();
142 shape->marker[i] = NULL;
143 }
144 shape->curve = NULL;
145 }
147 static void
148 sp_shape_finalize (GObject *object)
149 {
150 SPShape *shape=(SPShape *)object;
152 for ( int i = 0 ; i < SP_MARKER_LOC_QTY ; i++ ) {
153 shape->release_connect[i].disconnect();
154 shape->release_connect[i].~connection();
155 shape->modified_connect[i].disconnect();
156 shape->modified_connect[i].~connection();
157 }
159 if (((GObjectClass *) (parent_class))->finalize) {
160 (* ((GObjectClass *) (parent_class))->finalize)(object);
161 }
162 }
164 /**
165 * Virtual build callback for SPMarker.
166 *
167 * This is to be invoked immediately after creation of an SPShape.
168 *
169 * \see sp_object_build()
170 */
171 static void
172 sp_shape_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
173 {
174 if (((SPObjectClass *) (parent_class))->build) {
175 (*((SPObjectClass *) (parent_class))->build) (object, document, repr);
176 }
178 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
179 sp_shape_set_marker (object, i, object->style->marker[i].value);
180 }
181 }
183 /**
184 * Removes, releases and unrefs all children of object
185 *
186 * This is the inverse of sp_shape_build(). It must be invoked as soon
187 * as the shape is removed from the tree, even if it is still referenced
188 * by other objects. This routine also disconnects/unrefs markers and
189 * curves attached to it.
190 *
191 * \see sp_object_release()
192 */
193 static void
194 sp_shape_release (SPObject *object)
195 {
196 SPItem *item;
197 SPShape *shape;
198 SPItemView *v;
199 int i;
201 item = (SPItem *) object;
202 shape = (SPShape *) object;
204 for (i = 0; i < SP_MARKER_LOC_QTY; i++) {
205 if (shape->marker[i]) {
206 for (v = item->display; v != NULL; v = v->next) {
207 sp_marker_hide ((SPMarker *) shape->marker[i], NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
208 }
209 shape->release_connect[i].disconnect();
210 shape->modified_connect[i].disconnect();
211 shape->marker[i] = sp_object_hunref (shape->marker[i], object);
212 }
213 }
214 if (shape->curve) {
215 shape->curve = shape->curve->unref();
216 }
218 if (((SPObjectClass *) parent_class)->release) {
219 ((SPObjectClass *) parent_class)->release (object);
220 }
221 }
225 static void
226 sp_shape_set(SPObject *object, unsigned int key, gchar const *value)
227 {
228 if (((SPObjectClass *) parent_class)->set) {
229 ((SPObjectClass *) parent_class)->set(object, key, value);
230 }
231 }
233 static Inkscape::XML::Node *
234 sp_shape_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
235 {
236 if (((SPObjectClass *)(parent_class))->write) {
237 ((SPObjectClass *)(parent_class))->write(object, doc, repr, flags);
238 }
240 return repr;
241 }
243 /**
244 * Updates the shape when its attributes have changed. Also establishes
245 * marker objects to match the style settings.
246 */
247 static void
248 sp_shape_update (SPObject *object, SPCtx *ctx, unsigned int flags)
249 {
250 SPItem *item = (SPItem *) object;
251 SPShape *shape = (SPShape *) object;
253 if (((SPObjectClass *) (parent_class))->update) {
254 (* ((SPObjectClass *) (parent_class))->update) (object, ctx, flags);
255 }
257 /* This stanza checks that an object's marker style agrees with
258 * the marker objects it has allocated. sp_shape_set_marker ensures
259 * that the appropriate marker objects are present (or absent) to
260 * match the style.
261 */
262 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
263 sp_shape_set_marker (object, i, object->style->marker[i].value);
264 }
266 if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
267 SPStyle *style;
268 style = SP_OBJECT_STYLE (object);
269 if (style->stroke_width.unit == SP_CSS_UNIT_PERCENT) {
270 SPItemCtx *ictx = (SPItemCtx *) ctx;
271 double const aw = 1.0 / NR::expansion(ictx->i2vp);
272 style->stroke_width.computed = style->stroke_width.value * aw;
273 for (SPItemView *v = ((SPItem *) (shape))->display; v != NULL; v = v->next) {
274 nr_arena_shape_set_style ((NRArenaShape *) v->arenaitem, style);
275 }
276 }
277 }
279 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) {
280 /* This is suboptimal, because changing parent style schedules recalculation */
281 /* But on the other hand - how can we know that parent does not tie style and transform */
282 Geom::OptRect paintbox = SP_ITEM(object)->getBounds(Geom::identity(), SPItem::GEOMETRIC_BBOX);
283 for (SPItemView *v = SP_ITEM (shape)->display; v != NULL; v = v->next) {
284 NRArenaShape * const s = NR_ARENA_SHAPE(v->arenaitem);
285 if (flags & SP_OBJECT_MODIFIED_FLAG) {
286 nr_arena_shape_set_path(s, shape->curve, (flags & SP_OBJECT_USER_MODIFIED_FLAG_B));
287 }
288 if (paintbox) {
289 s->setPaintBox(*paintbox);
290 }
291 }
292 }
294 if (sp_shape_has_markers (shape)) {
295 /* Dimension marker views */
296 for (SPItemView *v = item->display; v != NULL; v = v->next) {
297 if (!v->arenaitem->key) {
298 NR_ARENA_ITEM_SET_KEY (v->arenaitem, sp_item_display_key_new (SP_MARKER_LOC_QTY));
299 }
300 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
301 if (shape->marker[i]) {
302 sp_marker_show_dimension ((SPMarker *) shape->marker[i],
303 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i,
304 sp_shape_number_of_markers (shape, i));
305 }
306 }
307 }
309 /* Update marker views */
310 for (SPItemView *v = item->display; v != NULL; v = v->next) {
311 sp_shape_update_marker_view (shape, v->arenaitem);
312 }
313 }
314 }
316 /**
317 * Calculate the transform required to get a marker's path object in the
318 * right place for particular path segment on a shape.
319 *
320 * \see sp_shape_marker_update_marker_view.
321 *
322 * From SVG spec:
323 * The axes of the temporary new user coordinate system are aligned according to the orient attribute on the 'marker'
324 * element and the slope of the curve at the given vertex. (Note: if there is a discontinuity at a vertex, the slope
325 * is the average of the slopes of the two segments of the curve that join at the given vertex. If a slope cannot be
326 * determined, the slope is assumed to be zero.)
327 *
328 * Reference: http://www.w3.org/TR/SVG11/painting.html#MarkerElement, the `orient' attribute.
329 * Reference for behaviour of zero-length segments:
330 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes
331 */
332 Geom::Matrix
333 sp_shape_marker_get_transform(Geom::Curve const & c1, Geom::Curve const & c2)
334 {
335 Geom::Point p = c1.pointAt(1);
336 Geom::Curve * c1_reverse = c1.reverse();
337 Geom::Point tang1 = - c1_reverse->unitTangentAt(0);
338 delete c1_reverse;
339 Geom::Point tang2 = c2.unitTangentAt(0);
341 double const angle1 = Geom::atan2(tang1);
342 double const angle2 = Geom::atan2(tang2);
344 double ret_angle;
345 ret_angle = .5 * (angle1 + angle2);
347 if ( fabs( angle2 - angle1 ) > M_PI ) {
348 /* ret_angle is in the middle of the larger of the two sectors between angle1 and
349 * angle2, so flip it by 180degrees to force it to the middle of the smaller sector.
350 *
351 * (Imagine a circle with rays drawn at angle1 and angle2 from the centre of the
352 * circle. Those two rays divide the circle into two sectors.)
353 */
354 ret_angle += M_PI;
355 }
357 return Geom::Rotate(ret_angle) * Geom::Translate(p);
358 }
359 Geom::Matrix
360 sp_shape_marker_get_transform_at_start(Geom::Curve const & c)
361 {
362 Geom::Point p = c.pointAt(0);
363 Geom::Matrix ret = Geom::Translate(p);
365 if ( !c.isDegenerate() ) {
366 Geom::Point tang = c.unitTangentAt(0);
367 double const angle = Geom::atan2(tang);
368 ret = Geom::Rotate(angle) * Geom::Translate(p);
369 } else {
370 /* FIXME: the svg spec says to search for a better alternative than zero angle directionality:
371 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */
372 }
374 return ret;
375 }
376 Geom::Matrix
377 sp_shape_marker_get_transform_at_end(Geom::Curve const & c)
378 {
379 Geom::Point p = c.pointAt(1);
380 Geom::Matrix ret = Geom::Translate(p);
382 if ( !c.isDegenerate() ) {
383 Geom::Curve * c_reverse = c.reverse();
384 Geom::Point tang = - c_reverse->unitTangentAt(0);
385 delete c_reverse;
386 double const angle = Geom::atan2(tang);
387 ret = Geom::Rotate(angle) * Geom::Translate(p);
388 } else {
389 /* FIXME: the svg spec says to search for a better alternative than zero angle directionality:
390 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */
391 }
393 return ret;
394 }
396 /**
397 * Updates the instances (views) of a given marker in a shape.
398 * Marker views have to be scaled already. The transformation
399 * is retrieved and then shown by calling sp_marker_show_instance.
400 *
401 * @todo figure out what to do when both 'marker' and for instance 'marker-end' are set.
402 */
403 static void
404 sp_shape_update_marker_view (SPShape *shape, NRArenaItem *ai)
405 {
406 SPStyle *style = ((SPObject *) shape)->style;
408 // position arguments to sp_marker_show_instance, basically counts the amount of markers.
409 int counter[4] = {0};
411 Geom::PathVector const & pathv = shape->curve->get_pathvector();
413 // the first vertex should get a start marker, the last an end marker, and all the others a mid marker
414 // see bug 456148
416 // START marker
417 {
418 Geom::Matrix const m (sp_shape_marker_get_transform_at_start(pathv.begin()->front()));
419 for (int i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START
420 if ( shape->marker[i] ) {
421 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
422 NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
423 style->stroke_width.computed);
424 counter[i]++;
425 }
426 }
427 }
429 // MID marker
430 if (shape->marker[SP_MARKER_LOC_MID] || shape->marker[SP_MARKER_LOC]) {
431 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
432 // START position
433 if ( path_it != pathv.begin()
434 && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, don't draw mid marker there
435 {
436 Geom::Matrix const m (sp_shape_marker_get_transform_at_start(path_it->front()));
437 for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
438 if ( shape->marker[i] ) {
439 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
440 NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
441 style->stroke_width.computed);
442 counter[i]++;
443 }
444 }
445 }
446 // MID position
447 if ( path_it->size_default() > 1) {
448 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
449 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
450 while (curve_it2 != path_it->end_default())
451 {
452 /* Put marker between curve_it1 and curve_it2.
453 * Loop to end_default (so including closing segment), because when a path is closed,
454 * there should be a midpoint marker between last segment and closing straight line segment
455 */
456 Geom::Matrix const m (sp_shape_marker_get_transform(*curve_it1, *curve_it2));
457 for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
458 if (shape->marker[i]) {
459 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
460 NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
461 style->stroke_width.computed);
462 counter[i]++;
463 }
464 }
466 ++curve_it1;
467 ++curve_it2;
468 }
469 }
470 // END position
471 if ( path_it != (pathv.end()-1) && !path_it->empty()) {
472 Geom::Curve const &lastcurve = path_it->back_default();
473 Geom::Matrix const m = sp_shape_marker_get_transform_at_end(lastcurve);
474 for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
475 if (shape->marker[i]) {
476 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
477 NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
478 style->stroke_width.computed);
479 counter[i]++;
480 }
481 }
482 }
483 }
484 }
486 // END marker
487 if ( shape->marker[SP_MARKER_LOC_END] || shape->marker[SP_MARKER_LOC] ) {
488 /* Get reference to last curve in the path.
489 * For moveto-only path, this returns the "closing line segment". */
490 Geom::Path const &path_last = pathv.back();
491 unsigned int index = path_last.size_default();
492 if (index > 0) {
493 index--;
494 }
495 Geom::Curve const &lastcurve = path_last[index];
496 Geom::Matrix const m = sp_shape_marker_get_transform_at_end(lastcurve);
498 for (int i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END
499 if (shape->marker[i]) {
500 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
501 NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
502 style->stroke_width.computed);
503 counter[i]++;
504 }
505 }
506 }
507 }
509 /**
510 * Sets modified flag for all sub-item views.
511 */
512 static void
513 sp_shape_modified (SPObject *object, unsigned int flags)
514 {
515 SPShape *shape = SP_SHAPE (object);
517 if (((SPObjectClass *) (parent_class))->modified) {
518 (* ((SPObjectClass *) (parent_class))->modified) (object, flags);
519 }
521 if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) {
522 for (SPItemView *v = SP_ITEM (shape)->display; v != NULL; v = v->next) {
523 nr_arena_shape_set_style (NR_ARENA_SHAPE (v->arenaitem), object->style);
524 }
525 }
526 }
528 /**
529 * Calculates the bounding box for item, storing it into bbox.
530 * This also includes the bounding boxes of any markers included in the shape.
531 */
532 static void sp_shape_bbox(SPItem const *item, NRRect *bbox, Geom::Matrix const &transform, unsigned const flags)
533 {
534 SPShape const *shape = SP_SHAPE (item);
535 if (shape->curve) {
536 Geom::OptRect geombbox = bounds_exact_transformed(shape->curve->get_pathvector(), transform);
537 if (geombbox) {
538 NRRect cbbox;
539 cbbox.x0 = (*geombbox)[0][0];
540 cbbox.y0 = (*geombbox)[1][0];
541 cbbox.x1 = (*geombbox)[0][1];
542 cbbox.y1 = (*geombbox)[1][1];
544 if ((SPItem::BBoxType) flags != SPItem::GEOMETRIC_BBOX) {
546 SPStyle* style=SP_OBJECT_STYLE (item);
547 if (!style->stroke.isNone()) {
548 double const scale = transform.descrim();
549 if ( fabs(style->stroke_width.computed * scale) > 0.01 ) { // sinon c'est 0=oon veut pas de bord
550 double const width = MAX(0.125, style->stroke_width.computed * scale);
551 if ( fabs(cbbox.x1-cbbox.x0) > -0.00001 && fabs(cbbox.y1-cbbox.y0) > -0.00001 ) {
552 cbbox.x0-=0.5*width;
553 cbbox.x1+=0.5*width;
554 cbbox.y0-=0.5*width;
555 cbbox.y1+=0.5*width;
556 }
557 }
558 }
560 // Union with bboxes of the markers, if any
561 if (sp_shape_has_markers (shape)) {
562 /** \todo make code prettier! */
563 Geom::PathVector const & pathv = shape->curve->get_pathvector();
564 // START marker
565 for (unsigned i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START
566 if ( shape->marker[i] ) {
567 SPMarker* marker = SP_MARKER (shape->marker[i]);
568 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
570 if (marker_item) {
571 Geom::Matrix tr(sp_shape_marker_get_transform_at_start(pathv.begin()->front()));
572 if (!marker->orient_auto) {
573 Geom::Point transl = tr.translation();
574 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
575 }
576 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
577 tr = Geom::Scale(style->stroke_width.computed) * tr;
578 }
580 // total marker transform
581 tr = marker_item->transform * marker->c2p * tr * transform;
583 // get bbox of the marker with that transform
584 NRRect marker_bbox;
585 sp_item_invoke_bbox (marker_item, &marker_bbox, from_2geom(tr), true);
586 // union it with the shape bbox
587 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
588 }
589 }
590 }
591 // MID marker
592 for (unsigned i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
593 SPMarker* marker = SP_MARKER (shape->marker[i]);
594 if ( !shape->marker[i] ) continue;
595 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
596 if ( !marker_item ) continue;
598 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
599 // START position
600 if ( path_it != pathv.begin()
601 && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, there is no mid marker there
602 {
603 Geom::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
604 if (!marker->orient_auto) {
605 Geom::Point transl = tr.translation();
606 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
607 }
608 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
609 tr = Geom::Scale(style->stroke_width.computed) * tr;
610 }
611 tr = marker_item->transform * marker->c2p * tr * transform;
612 NRRect marker_bbox;
613 sp_item_invoke_bbox (marker_item, &marker_bbox, from_2geom(tr), true);
614 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
615 }
616 // MID position
617 if ( path_it->size_default() > 1) {
618 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
619 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
620 while (curve_it2 != path_it->end_default())
621 {
622 /* Put marker between curve_it1 and curve_it2.
623 * Loop to end_default (so including closing segment), because when a path is closed,
624 * there should be a midpoint marker between last segment and closing straight line segment */
626 SPMarker* marker = SP_MARKER (shape->marker[i]);
627 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
629 if (marker_item) {
630 Geom::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
631 if (!marker->orient_auto) {
632 Geom::Point transl = tr.translation();
633 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
634 }
635 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
636 tr = Geom::Scale(style->stroke_width.computed) * tr;
637 }
638 tr = marker_item->transform * marker->c2p * tr * transform;
639 NRRect marker_bbox;
640 sp_item_invoke_bbox (marker_item, &marker_bbox, from_2geom(tr), true);
641 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
642 }
644 ++curve_it1;
645 ++curve_it2;
646 }
647 }
648 // END position
649 if ( path_it != (pathv.end()-1) && !path_it->empty()) {
650 Geom::Curve const &lastcurve = path_it->back_default();
651 Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
652 if (!marker->orient_auto) {
653 Geom::Point transl = tr.translation();
654 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
655 }
656 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
657 tr = Geom::Scale(style->stroke_width.computed) * tr;
658 }
659 tr = marker_item->transform * marker->c2p * tr * transform;
660 NRRect marker_bbox;
661 sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
662 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
663 }
664 }
665 }
666 // END marker
667 for (unsigned i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END
668 if ( shape->marker[i] ) {
669 SPMarker* marker = SP_MARKER (shape->marker[i]);
670 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
672 if (marker_item) {
673 /* Get reference to last curve in the path.
674 * For moveto-only path, this returns the "closing line segment". */
675 Geom::Path const &path_last = pathv.back();
676 unsigned int index = path_last.size_default();
677 if (index > 0) {
678 index--;
679 }
680 Geom::Curve const &lastcurve = path_last[index];
682 Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
683 if (!marker->orient_auto) {
684 Geom::Point transl = tr.translation();
685 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
686 }
687 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
688 tr = Geom::Scale(style->stroke_width.computed) * tr;
689 }
691 // total marker transform
692 tr = marker_item->transform * marker->c2p * tr * transform;
694 // get bbox of the marker with that transform
695 NRRect marker_bbox;
696 sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
697 // union it with the shape bbox
698 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
699 }
700 }
701 }
702 }
703 }
705 // copy our bbox to the variable we're given
706 *bbox = cbbox;
707 }
708 }
709 }
711 static void
712 sp_shape_print_invoke_marker_printing(SPObject* obj, Geom::Matrix tr, SPStyle* style, SPPrintContext *ctx) {
713 SPMarker *marker = SP_MARKER(obj);
714 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
715 tr = Geom::Scale(style->stroke_width.computed) * tr;
716 }
718 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
719 tr = marker_item->transform * marker->c2p * tr;
721 Geom::Matrix old_tr = marker_item->transform;
722 marker_item->transform = tr;
723 sp_item_invoke_print (marker_item, ctx);
724 marker_item->transform = old_tr;
725 }
726 /**
727 * Prepares shape for printing. Handles printing of comments for printing
728 * debugging, sizes the item to fit into the document width/height,
729 * applies print fill/stroke, sets transforms for markers, and adds
730 * comment labels.
731 */
732 void
733 sp_shape_print (SPItem *item, SPPrintContext *ctx)
734 {
735 NRRect pbox, dbox, bbox;
737 SPShape *shape = SP_SHAPE(item);
739 if (!shape->curve) return;
741 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
742 gint add_comments = prefs->getBool("/printing/debug/add-label-comments");
743 if (add_comments) {
744 gchar * comment = g_strdup_printf("begin '%s'",
745 SP_OBJECT(item)->defaultLabel());
746 sp_print_comment(ctx, comment);
747 g_free(comment);
748 }
750 /* fixme: Think (Lauris) */
751 sp_item_invoke_bbox(item, &pbox, Geom::identity(), TRUE);
752 dbox.x0 = 0.0;
753 dbox.y0 = 0.0;
754 dbox.x1 = sp_document_width (SP_OBJECT_DOCUMENT (item));
755 dbox.y1 = sp_document_height (SP_OBJECT_DOCUMENT (item));
756 sp_item_bbox_desktop (item, &bbox);
757 Geom::Matrix const i2d(sp_item_i2d_affine(item));
759 SPStyle* style = SP_OBJECT_STYLE (item);
761 if (!style->fill.isNone()) {
762 sp_print_fill (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
763 }
765 if (!style->stroke.isNone()) {
766 sp_print_stroke (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
767 }
769 /** \todo make code prettier */
770 Geom::PathVector const & pathv = shape->curve->get_pathvector();
771 // START marker
772 for (int i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START
773 if ( shape->marker[i] ) {
774 Geom::Matrix tr(sp_shape_marker_get_transform_at_start(pathv.begin()->front()));
775 sp_shape_print_invoke_marker_printing(shape->marker[i], tr, style, ctx);
776 }
777 }
778 // MID marker
779 for (int i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
780 if (shape->marker[i]) {
781 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
782 // START position
783 if ( path_it != pathv.begin()
784 && ! ((path_it == (pathv.end()-1)) && (path_it->size_default() == 0)) ) // if this is the last path and it is a moveto-only, there is no mid marker there
785 {
786 Geom::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
787 sp_shape_print_invoke_marker_printing(shape->marker[i], tr, style, ctx);
788 }
789 // MID position
790 if ( path_it->size_default() > 1) {
791 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
792 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
793 while (curve_it2 != path_it->end_default())
794 {
795 /* Put marker between curve_it1 and curve_it2.
796 * Loop to end_default (so including closing segment), because when a path is closed,
797 * there should be a midpoint marker between last segment and closing straight line segment */
798 Geom::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
800 sp_shape_print_invoke_marker_printing(shape->marker[i], tr, style, ctx);
802 ++curve_it1;
803 ++curve_it2;
804 }
805 }
806 if ( path_it != (pathv.end()-1) && !path_it->empty()) {
807 Geom::Curve const &lastcurve = path_it->back_default();
808 Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
809 sp_shape_print_invoke_marker_printing(shape->marker[i], tr, style, ctx);
810 }
811 }
812 }
813 }
814 // END marker
815 if ( shape->marker[SP_MARKER_LOC_END] || shape->marker[SP_MARKER_LOC]) {
816 /* Get reference to last curve in the path.
817 * For moveto-only path, this returns the "closing line segment". */
818 Geom::Path const &path_last = pathv.back();
819 unsigned int index = path_last.size_default();
820 if (index > 0) {
821 index--;
822 }
823 Geom::Curve const &lastcurve = path_last[index];
825 Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
827 for (int i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END
828 if (shape->marker[i]) {
829 sp_shape_print_invoke_marker_printing(shape->marker[i], tr, style, ctx);
830 }
831 }
832 }
834 if (add_comments) {
835 gchar * comment = g_strdup_printf("end '%s'",
836 SP_OBJECT(item)->defaultLabel());
837 sp_print_comment(ctx, comment);
838 g_free(comment);
839 }
840 }
842 /**
843 * Sets style, path, and paintbox. Updates marker views, including dimensions.
844 */
845 static NRArenaItem *
846 sp_shape_show (SPItem *item, NRArena *arena, unsigned int /*key*/, unsigned int /*flags*/)
847 {
848 SPObject *object = SP_OBJECT(item);
849 SPShape *shape = SP_SHAPE(item);
851 NRArenaItem *arenaitem = NRArenaShape::create(arena);
852 NRArenaShape * const s = NR_ARENA_SHAPE(arenaitem);
853 nr_arena_shape_set_style(s, object->style);
854 nr_arena_shape_set_path(s, shape->curve, false);
855 Geom::OptRect paintbox = item->getBounds(Geom::identity());
856 if (paintbox) {
857 s->setPaintBox(*paintbox);
858 }
860 /* This stanza checks that an object's marker style agrees with
861 * the marker objects it has allocated. sp_shape_set_marker ensures
862 * that the appropriate marker objects are present (or absent) to
863 * match the style.
864 */
865 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
866 sp_shape_set_marker (object, i, object->style->marker[i].value);
867 }
869 if (sp_shape_has_markers (shape)) {
871 /* provide key and dimension the marker views */
872 if (!arenaitem->key) {
873 NR_ARENA_ITEM_SET_KEY (arenaitem, sp_item_display_key_new (SP_MARKER_LOC_QTY));
874 }
876 for (int i = 0; i < SP_MARKER_LOC_QTY; i++) {
877 if (shape->marker[i]) {
878 sp_marker_show_dimension ((SPMarker *) shape->marker[i],
879 NR_ARENA_ITEM_GET_KEY (arenaitem) + i,
880 sp_shape_number_of_markers (shape, i));
881 }
882 }
884 /* Update marker views */
885 sp_shape_update_marker_view (shape, arenaitem);
886 }
888 return arenaitem;
889 }
891 /**
892 * Hides/removes marker views from the shape.
893 */
894 static void
895 sp_shape_hide (SPItem *item, unsigned int key)
896 {
897 SPShape *shape;
898 SPItemView *v;
899 int i;
901 shape = (SPShape *) item;
903 for (i=0; i<SP_MARKER_LOC_QTY; i++) {
904 if (shape->marker[i]) {
905 for (v = item->display; v != NULL; v = v->next) {
906 if (key == v->key) {
907 sp_marker_hide ((SPMarker *) shape->marker[i],
908 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
909 }
910 }
911 }
912 }
914 if (((SPItemClass *) parent_class)->hide) {
915 ((SPItemClass *) parent_class)->hide (item, key);
916 }
917 }
919 /**
920 * \param shape Shape.
921 * \return TRUE if the shape has any markers, or FALSE if not.
922 */
923 int
924 sp_shape_has_markers (SPShape const *shape)
925 {
926 /* Note, we're ignoring 'marker' settings, which technically should apply for
927 all three settings. This should be fixed later such that if 'marker' is
928 specified, then all three should appear. */
930 return (
931 shape->curve &&
932 (shape->marker[SP_MARKER_LOC] ||
933 shape->marker[SP_MARKER_LOC_START] ||
934 shape->marker[SP_MARKER_LOC_MID] ||
935 shape->marker[SP_MARKER_LOC_END])
936 );
937 }
940 /**
941 * \param shape Shape.
942 * \param type Marker type (e.g. SP_MARKER_LOC_START)
943 * \return Number of markers that the shape has of this type.
944 */
945 int
946 sp_shape_number_of_markers (SPShape *shape, int type)
947 {
948 Geom::PathVector const & pathv = shape->curve->get_pathvector();
949 if (pathv.size() == 0) {
950 return 0;
951 }
953 switch(type) {
954 case SP_MARKER_LOC:
955 {
956 if ( shape->marker[SP_MARKER_LOC] ) {
957 guint n = 0;
958 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
959 n += path_it->size_default() + 1;
960 }
961 return n;
962 } else {
963 return 0;
964 }
965 }
966 case SP_MARKER_LOC_START:
967 // there is only a start marker on the first path of a pathvector
968 return shape->marker[SP_MARKER_LOC_START] ? 1 : 0;
970 case SP_MARKER_LOC_MID:
971 {
972 if ( shape->marker[SP_MARKER_LOC_MID] ) {
973 guint n = 0;
974 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
975 n += path_it->size_default() + 1;
976 }
977 return n - 2; // minus the start and end marker.
978 } else {
979 return 0;
980 }
981 }
983 case SP_MARKER_LOC_END:
984 {
985 // there is only an end marker on the last path of a pathvector
986 return shape->marker[SP_MARKER_LOC_END] ? 1 : 0;
987 }
989 default:
990 return 0;
991 }
992 }
994 /**
995 * Checks if the given marker is used in the shape, and if so, it
996 * releases it by calling sp_marker_hide. Also detaches signals
997 * and unrefs the marker from the shape.
998 */
999 static void
1000 sp_shape_marker_release (SPObject *marker, SPShape *shape)
1001 {
1002 SPItem *item;
1003 int i;
1005 item = (SPItem *) shape;
1007 for (i = 0; i < SP_MARKER_LOC_QTY; i++) {
1008 if (marker == shape->marker[i]) {
1009 SPItemView *v;
1010 /* Hide marker */
1011 for (v = item->display; v != NULL; v = v->next) {
1012 sp_marker_hide ((SPMarker *) (shape->marker[i]), NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
1013 /* fixme: Do we need explicit remove here? (Lauris) */
1014 /* nr_arena_item_set_mask (v->arenaitem, NULL); */
1015 }
1016 /* Detach marker */
1017 shape->release_connect[i].disconnect();
1018 shape->modified_connect[i].disconnect();
1019 shape->marker[i] = sp_object_hunref (shape->marker[i], item);
1020 }
1021 }
1022 }
1024 /**
1025 * No-op. Exists for handling 'modified' messages
1026 */
1027 static void
1028 sp_shape_marker_modified (SPObject */*marker*/, guint /*flags*/, SPItem */*item*/)
1029 {
1030 /* I think mask does update automagically */
1031 /* g_warning ("Item %s mask %s modified", SP_OBJECT_ID (item), SP_OBJECT_ID (mask)); */
1032 }
1034 /**
1035 * Adds a new marker to shape object at the location indicated by key. value
1036 * must be a valid URI reference resolvable from the shape object (i.e., present
1037 * in the document <defs>). If the shape object already has a marker
1038 * registered at the given position, it is removed first. Then the
1039 * new marker is hrefed and its signals connected.
1040 */
1041 void
1042 sp_shape_set_marker (SPObject *object, unsigned int key, const gchar *value)
1043 {
1044 SPItem *item = (SPItem *) object;
1045 SPShape *shape = (SPShape *) object;
1047 if (key > SP_MARKER_LOC_END) {
1048 return;
1049 }
1051 SPObject *mrk = sp_css_uri_reference_resolve (SP_OBJECT_DOCUMENT (object), value);
1052 if (mrk != shape->marker[key]) {
1053 if (shape->marker[key]) {
1054 SPItemView *v;
1056 /* Detach marker */
1057 shape->release_connect[key].disconnect();
1058 shape->modified_connect[key].disconnect();
1060 /* Hide marker */
1061 for (v = item->display; v != NULL; v = v->next) {
1062 sp_marker_hide ((SPMarker *) (shape->marker[key]),
1063 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + key);
1064 /* fixme: Do we need explicit remove here? (Lauris) */
1065 /* nr_arena_item_set_mask (v->arenaitem, NULL); */
1066 }
1068 /* Unref marker */
1069 shape->marker[key] = sp_object_hunref (shape->marker[key], object);
1070 }
1071 if (SP_IS_MARKER (mrk)) {
1072 shape->marker[key] = sp_object_href (mrk, object);
1073 shape->release_connect[key] = mrk->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_shape_marker_release), shape));
1074 shape->modified_connect[key] = mrk->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_shape_marker_modified), shape));
1075 }
1076 }
1077 }
1081 /* Shape section */
1083 /**
1084 * Calls any registered handlers for the set_shape action
1085 */
1086 void
1087 sp_shape_set_shape (SPShape *shape)
1088 {
1089 g_return_if_fail (shape != NULL);
1090 g_return_if_fail (SP_IS_SHAPE (shape));
1092 if (SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape) {
1093 SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape (shape);
1094 }
1095 }
1097 /**
1098 * Adds a curve to the shape. If owner is specified, a reference
1099 * will be made, otherwise the curve will be copied into the shape.
1100 * Any existing curve in the shape will be unreferenced first.
1101 * This routine also triggers a request to update the display.
1102 */
1103 void
1104 sp_shape_set_curve (SPShape *shape, SPCurve *curve, unsigned int owner)
1105 {
1106 if (shape->curve) {
1107 shape->curve = shape->curve->unref();
1108 }
1109 if (curve) {
1110 if (owner) {
1111 shape->curve = curve->ref();
1112 } else {
1113 shape->curve = curve->copy();
1114 }
1115 }
1116 SP_OBJECT(shape)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
1117 }
1119 /**
1120 * Return duplicate of curve (if any exists) or NULL if there is no curve
1121 */
1122 SPCurve *
1123 sp_shape_get_curve (SPShape *shape)
1124 {
1125 if (shape->curve) {
1126 return shape->curve->copy();
1127 }
1128 return NULL;
1129 }
1131 /**
1132 * Same as sp_shape_set_curve but without updating the display
1133 */
1134 void
1135 sp_shape_set_curve_insync (SPShape *shape, SPCurve *curve, unsigned int owner)
1136 {
1137 if (shape->curve) {
1138 shape->curve = shape->curve->unref();
1139 }
1140 if (curve) {
1141 if (owner) {
1142 shape->curve = curve->ref();
1143 } else {
1144 shape->curve = curve->copy();
1145 }
1146 }
1147 }
1149 /**
1150 * Return all nodes in a path that are to be considered for snapping
1151 */
1152 static void sp_shape_snappoints(SPItem const *item, std::vector<Inkscape::SnapCandidatePoint> &p, Inkscape::SnapPreferences const *snapprefs)
1153 {
1154 g_assert(item != NULL);
1155 g_assert(SP_IS_SHAPE(item));
1157 SPShape const *shape = SP_SHAPE(item);
1158 if (shape->curve == NULL) {
1159 return;
1160 }
1162 // Help enforcing strict snapping, i.e. only return nodes when we're snapping nodes to nodes or a guide to nodes
1163 if (!(snapprefs->getSnapModeNode() || snapprefs->getSnapModeGuide())) {
1164 return;
1165 }
1167 Geom::PathVector const &pathv = shape->curve->get_pathvector();
1168 if (pathv.empty())
1169 return;
1171 Geom::Matrix const i2d (sp_item_i2d_affine (item));
1173 if (snapprefs->getSnapObjectMidpoints()) {
1174 Geom::OptRect bbox = item->getBounds(sp_item_i2d_affine(item));
1175 if (bbox) {
1176 p.push_back(Inkscape::SnapCandidatePoint(bbox->midpoint(), Inkscape::SNAPSOURCE_OBJECT_MIDPOINT, Inkscape::SNAPTARGET_OBJECT_MIDPOINT));
1177 }
1178 }
1180 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
1181 if (snapprefs->getSnapToItemNode()) {
1182 p.push_back(Inkscape::SnapCandidatePoint(path_it->initialPoint() * i2d, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP));
1183 }
1185 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
1186 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
1187 while (curve_it2 != path_it->end_closed())
1188 {
1189 /* Test whether to add the node between curve_it1 and curve_it2.
1190 * Loop to end_closed (so always including closing segment); the last node to be added
1191 * is the node between the closing segment and the segment before that, regardless
1192 * of the path being closed or not. If the path is closed, the final point was already added by
1193 * adding the initial point. */
1195 Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2);
1197 bool c1 = snapprefs->getSnapToItemNode() && (nodetype == Geom::NODE_CUSP || nodetype == Geom::NODE_NONE);
1198 bool c2 = snapprefs->getSnapSmoothNodes() && (nodetype == Geom::NODE_SMOOTH || nodetype == Geom::NODE_SYMM);
1200 if (c1 || c2) {
1201 p.push_back(Inkscape::SnapCandidatePoint(curve_it1->finalPoint() * i2d, Inkscape::SNAPSOURCE_NODE_CUSP, Inkscape::SNAPTARGET_NODE_CUSP));
1202 }
1204 // Consider midpoints of line segments for snapping
1205 if (snapprefs->getSnapLineMidpoints()) { // only do this when we're snapping nodes (enforce strict snapping)
1206 if (Geom::LineSegment const* line_segment = dynamic_cast<Geom::LineSegment const*>(&(*curve_it1))) {
1207 p.push_back(Inkscape::SnapCandidatePoint(Geom::middle_point(*line_segment) * i2d, Inkscape::SNAPSOURCE_LINE_MIDPOINT, Inkscape::SNAPTARGET_LINE_MIDPOINT));
1208 }
1209 }
1211 ++curve_it1;
1212 ++curve_it2;
1213 }
1215 // Find the internal intersections of each path and consider these for snapping
1216 // (using "Method 1" as described in Inkscape::ObjectSnapper::_collectNodes())
1217 if (snapprefs->getSnapIntersectionCS()) {
1218 Geom::Crossings cs;
1219 cs = self_crossings(*path_it);
1220 if (cs.size() > 0) { // There might be multiple intersections...
1221 for (Geom::Crossings::const_iterator i = cs.begin(); i != cs.end(); i++) {
1222 Geom::Point p_ix = (*path_it).pointAt((*i).ta);
1223 p.push_back(Inkscape::SnapCandidatePoint(p_ix * i2d, Inkscape::SNAPSOURCE_PATH_INTERSECTION, Inkscape::SNAPTARGET_PATH_INTERSECTION));
1224 }
1225 }
1226 }
1227 }
1229 }
1231 /*
1232 Local Variables:
1233 mode:c++
1234 c-file-style:"stroustrup"
1235 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1236 indent-tabs-mode:nil
1237 fill-column:99
1238 End:
1239 */
1240 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :