src/sp-shape.cpp

   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  */
  14
  15 #ifdef HAVE_CONFIG_H
  16 # include "config.h"
  17 #endif
  18
  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"
  29
  30 #include <sigc++/functors/ptr_fun.h>
  31 #include <sigc++/adaptors/bind.h>
  32
  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"
  43
  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"
  50
  51 #include "util/mathfns.h" // for triangle_area()
  52
  53 #define noSHAPE_VERBOSE
  54
  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);
  58
  59 static void sp_shape_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr);
  60 static void sp_shape_release (SPObject *object);
  61
  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);
  66
  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, bool const target, SnapPointsWithType &p, Inkscape::SnapPreferences const *snapprefs);
  72
  73 static void sp_shape_update_marker_view (SPShape *shape, NRArenaItem *ai);
  74
  75 static SPLPEItemClass *parent_class;
  76
  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 }
  99
 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);
 111
 112     parent_class = (SPLPEItemClass *)g_type_class_peek_parent (klass);
 113
 114     gobject_class->finalize = sp_shape_finalize;
 115
 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;
 122
 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;
 129
 130     klass->set_shape = NULL;
 131 }
 132
 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 }
 146
 147 static void
 148 sp_shape_finalize (GObject *object)
 149 {
 150     SPShape *shape=(SPShape *)object;
 151
 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     }
 158
 159     if (((GObjectClass *) (parent_class))->finalize) {
 160         (* ((GObjectClass *) (parent_class))->finalize)(object);
 161     }
 162 }
 163
 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     }
 177
 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 }
 182
 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;
 200
 201     item = (SPItem *) object;
 202     shape = (SPShape *) object;
 203
 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     }
 217
 218     if (((SPObjectClass *) parent_class)->release) {
 219       ((SPObjectClass *) parent_class)->release (object);
 220     }
 221 }
 222
 223
 224
 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 }
 232
 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     }
 239
 240     return repr;
 241 }
 242
 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;
 252
 253     if (((SPObjectClass *) (parent_class))->update) {
 254         (* ((SPObjectClass *) (parent_class))->update) (object, ctx, flags);
 255     }
 256
 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       }
 265
 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     }
 278
 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     }
 293
 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         }
 308
 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 }
 315
 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);
 340
 341     double const angle1 = Geom::atan2(tang1);
 342     double const angle2 = Geom::atan2(tang2);
 343
 344     double ret_angle;
 345     ret_angle = .5 * (angle1 + angle2);
 346
 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     }
 356
 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);
 364
 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     }
 373
 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);
 381
 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     }
 392
 393     return ret;
 394 }
 395
 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;
 407
 408     // position arguments to sp_marker_show_instance, basically counts the amount of markers.
 409     int counter[4] = {0};
 410
 411     Geom::PathVector const & pathv = shape->curve->get_pathvector();
 412     for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
 413       // START position
 414         Geom::Matrix const m (sp_shape_marker_get_transform_at_start(path_it->front()));
 415         for (int i = 0; i < 2; i++) {  // SP_MARKER_LOC and SP_MARKER_LOC_START
 416             if ( shape->marker[i] ) {
 417                 sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
 418                                          NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
 419                                          style->stroke_width.computed);
 420                  counter[i]++;
 421             }
 422         }
 423
 424       // MID position
 425         if ( (shape->marker[SP_MARKER_LOC_MID] || shape->marker[SP_MARKER_LOC]) && (path_it->size_default() > 1) ) {
 426             Geom::Path::const_iterator curve_it1 = path_it->begin();      // incoming curve
 427             Geom::Path::const_iterator curve_it2 = ++(path_it->begin());  // outgoing curve
 428             while (curve_it2 != path_it->end_default())
 429             {
 430                 /* Put marker between curve_it1 and curve_it2.
 431                  * Loop to end_default (so including closing segment), because when a path is closed,
 432                  * there should be a midpoint marker between last segment and closing straight line segment
 433                  */
 434                 Geom::Matrix const m (sp_shape_marker_get_transform(*curve_it1, *curve_it2));
 435                 for (int i = 0; i < 3; i += 2) {  // SP_MARKER_LOC and SP_MARKER_LOC_MID
 436                     if (shape->marker[i]) {
 437                         sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
 438                                                  NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
 439                                                  style->stroke_width.computed);
 440                         counter[i]++;
 441                     }
 442                 }
 443
 444                 ++curve_it1;
 445                 ++curve_it2;
 446             }
 447         }
 448
 449       // END position
 450         if ( shape->marker[SP_MARKER_LOC_END] || shape->marker[SP_MARKER_LOC] ) {
 451             /* Get reference to last curve in the path.
 452              * For moveto-only path, this returns the "closing line segment". */
 453             unsigned int index = path_it->size_default();
 454             if (index > 0) {
 455                 index--;
 456             }
 457             Geom::Curve const &lastcurve = (*path_it)[index];
 458             Geom::Matrix const m = sp_shape_marker_get_transform_at_end(lastcurve);
 459
 460             for (int i = 0; i < 4; i += 3) {  // SP_MARKER_LOC and SP_MARKER_LOC_END
 461                 if (shape->marker[i]) {
 462                     sp_marker_show_instance ((SPMarker* ) shape->marker[i], ai,
 463                                              NR_ARENA_ITEM_GET_KEY(ai) + i, counter[i], m,
 464                                              style->stroke_width.computed);
 465                     counter[i]++;
 466                 }
 467             }
 468         }
 469     }
 470 }
 471
 472 /**
 473  * Sets modified flag for all sub-item views.
 474  */
 475 static void
 476 sp_shape_modified (SPObject *object, unsigned int flags)
 477 {
 478     SPShape *shape = SP_SHAPE (object);
 479
 480     if (((SPObjectClass *) (parent_class))->modified) {
 481       (* ((SPObjectClass *) (parent_class))->modified) (object, flags);
 482     }
 483
 484     if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) {
 485         for (SPItemView *v = SP_ITEM (shape)->display; v != NULL; v = v->next) {
 486             nr_arena_shape_set_style (NR_ARENA_SHAPE (v->arenaitem), object->style);
 487         }
 488     }
 489 }
 490
 491 /**
 492  * Calculates the bounding box for item, storing it into bbox.
 493  * This also includes the bounding boxes of any markers included in the shape.
 494  */
 495 static void sp_shape_bbox(SPItem const *item, NRRect *bbox, Geom::Matrix const &transform, unsigned const flags)
 496 {
 497     SPShape const *shape = SP_SHAPE (item);
 498     if (shape->curve) {
 499         Geom::OptRect geombbox = bounds_exact_transformed(shape->curve->get_pathvector(), transform);
 500         if (geombbox) {
 501             NRRect  cbbox;
 502             cbbox.x0 = (*geombbox)[0][0];
 503             cbbox.y0 = (*geombbox)[1][0];
 504             cbbox.x1 = (*geombbox)[0][1];
 505             cbbox.y1 = (*geombbox)[1][1];
 506
 507             if ((SPItem::BBoxType) flags != SPItem::GEOMETRIC_BBOX) {
 508
 509                 SPStyle* style=SP_OBJECT_STYLE (item);
 510                 if (!style->stroke.isNone()) {
 511                     double const scale = transform.descrim();
 512                     if ( fabs(style->stroke_width.computed * scale) > 0.01 ) { // sinon c'est 0=oon veut pas de bord
 513                         double const width = MAX(0.125, style->stroke_width.computed * scale);
 514                         if ( fabs(cbbox.x1-cbbox.x0) > -0.00001 && fabs(cbbox.y1-cbbox.y0) > -0.00001 ) {
 515                             cbbox.x0-=0.5*width;
 516                             cbbox.x1+=0.5*width;
 517                             cbbox.y0-=0.5*width;
 518                             cbbox.y1+=0.5*width;
 519                         }
 520                     }
 521                 }
 522
 523                 // Union with bboxes of the markers, if any
 524                 if (sp_shape_has_markers (shape)) {
 525                     /* TODO: make code prettier: lots of variables can be taken out of the loop! */
 526                     Geom::PathVector const & pathv = shape->curve->get_pathvector();
 527                     for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
 528                         for (unsigned i = 0; i < 2; i++) { // SP_MARKER_LOC and SP_MARKER_LOC_START
 529                             if ( shape->marker[i] ) {
 530                                 SPMarker* marker = SP_MARKER (shape->marker[i]);
 531                                 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
 532
 533                                 if (marker_item) {
 534                                                                         Geom::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
 535                                                                         if (!marker->orient_auto) {
 536                                                                                 Geom::Point transl = tr.translation();
 537                                                                                 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
 538                                                                         }
 539                                                                         if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
 540                                                                                 tr = Geom::Scale(style->stroke_width.computed) * tr;
 541                                                                         }
 542
 543                                                                         // total marker transform
 544                                                                         tr = marker_item->transform * marker->c2p * tr * transform;
 545
 546                                                                         // get bbox of the marker with that transform
 547                                                                         NRRect marker_bbox;
 548                                                                         sp_item_invoke_bbox (marker_item, &marker_bbox, from_2geom(tr), true);
 549                                                                         // union it with the shape bbox
 550                                                                         nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
 551                                 }
 552                             }
 553                         }
 554
 555                         for (unsigned i = 0; i < 3; i += 2) { // SP_MARKER_LOC and SP_MARKER_LOC_MID
 556                             if ( shape->marker[i] && (path_it->size_default() > 1) ) {
 557                                 Geom::Path::const_iterator curve_it1 = path_it->begin();      // incoming curve
 558                                 Geom::Path::const_iterator curve_it2 = ++(path_it->begin());  // outgoing curve
 559                                 while (curve_it2 != path_it->end_default())
 560                                 {
 561                                     /* Put marker between curve_it1 and curve_it2.
 562                                      * Loop to end_default (so including closing segment), because when a path is closed,
 563                                      * there should be a midpoint marker between last segment and closing straight line segment */
 564
 565                                     SPMarker* marker = SP_MARKER (shape->marker[i]);
 566                                     SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
 567
 568                                     if (marker_item) {
 569                                         Geom::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
 570                                                                                 if (!marker->orient_auto) {
 571                                                                                         Geom::Point transl = tr.translation();
 572                                                                                         tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
 573                                                                                 }
 574                                                                                 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
 575                                                                                         tr = Geom::Scale(style->stroke_width.computed) * tr;
 576                                                                                 }
 577
 578                                                                                 // total marker transform
 579                                                                                 tr = marker_item->transform * marker->c2p * tr * transform;
 580
 581                                                                                 // get bbox of the marker with that transform
 582                                                                                 NRRect marker_bbox;
 583                                                                                 sp_item_invoke_bbox (marker_item, &marker_bbox, from_2geom(tr), true);
 584                                                                                 // union it with the shape bbox
 585                                                                                 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
 586                                     }
 587
 588                                     ++curve_it1;
 589                                     ++curve_it2;
 590                                 }
 591                             }
 592                         }
 593
 594                         for (unsigned i = 0; i < 4; i += 3) { // SP_MARKER_LOC and SP_MARKER_LOC_END
 595                             if ( shape->marker[i] ) {
 596                                 SPMarker* marker = SP_MARKER (shape->marker[i]);
 597                                 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
 598
 599                                 if (marker_item) {
 600                                                                         /* Get reference to last curve in the path.
 601                                                                          * For moveto-only path, this returns the "closing line segment". */
 602                                                                         unsigned int index = path_it->size_default();
 603                                                                         if (index > 0) {
 604                                                                                 index--;
 605                                                                         }
 606                                                                         Geom::Curve const &lastcurve = (*path_it)[index];
 607
 608                                                                         Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
 609                                                                         if (!marker->orient_auto) {
 610                                                                                 Geom::Point transl = tr.translation();
 611                                                                                 tr = Geom::Rotate::from_degrees(marker->orient) * Geom::Translate(transl);
 612                                                                         }
 613                                                                         if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
 614                                                                                 tr = Geom::Scale(style->stroke_width.computed) * tr;
 615                                                                         }
 616
 617                                                                         // total marker transform
 618                                                                         tr = marker_item->transform * marker->c2p * tr * transform;
 619
 620                                                                         // get bbox of the marker with that transform
 621                                                                         NRRect marker_bbox;
 622                                                                         sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
 623                                                                         // union it with the shape bbox
 624                                                                         nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
 625                                 }
 626                             }
 627                         }
 628                     }
 629                 }
 630             }
 631
 632             // copy our bbox to the variable we're given
 633             *bbox = cbbox;
 634         }
 635     }
 636 }
 637
 638 static void
 639 sp_shape_print_invoke_marker_printing(SPObject* obj, Geom::Matrix tr, SPStyle* style, SPPrintContext *ctx) {
 640     SPMarker *marker = SP_MARKER(obj);
 641     if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
 642         tr = Geom::Scale(style->stroke_width.computed) * tr;
 643     }
 644
 645     SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (marker));
 646     tr = marker_item->transform * marker->c2p * tr;
 647
 648     Geom::Matrix old_tr = marker_item->transform;
 649     marker_item->transform = tr;
 650     sp_item_invoke_print (marker_item, ctx);
 651     marker_item->transform = old_tr;
 652 }
 653 /**
 654  * Prepares shape for printing.  Handles printing of comments for printing
 655  * debugging, sizes the item to fit into the document width/height,
 656  * applies print fill/stroke, sets transforms for markers, and adds
 657  * comment labels.
 658  */
 659 void
 660 sp_shape_print (SPItem *item, SPPrintContext *ctx)
 661 {
 662     NRRect pbox, dbox, bbox;
 663
 664     SPShape *shape = SP_SHAPE(item);
 665
 666     if (!shape->curve) return;
 667
 668         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 669         gint add_comments = prefs->getBool("/printing/debug/add-label-comments");
 670         if (add_comments) {
 671             gchar * comment = g_strdup_printf("begin '%s'",
 672                                               SP_OBJECT(item)->defaultLabel());
 673             sp_print_comment(ctx, comment);
 674             g_free(comment);
 675         }
 676
 677     /* fixme: Think (Lauris) */
 678     sp_item_invoke_bbox(item, &pbox, Geom::identity(), TRUE);
 679     dbox.x0 = 0.0;
 680     dbox.y0 = 0.0;
 681     dbox.x1 = sp_document_width (SP_OBJECT_DOCUMENT (item));
 682     dbox.y1 = sp_document_height (SP_OBJECT_DOCUMENT (item));
 683     sp_item_bbox_desktop (item, &bbox);
 684     Geom::Matrix const i2d(sp_item_i2d_affine(item));
 685
 686     SPStyle* style = SP_OBJECT_STYLE (item);
 687
 688     if (!style->fill.isNone()) {
 689         sp_print_fill (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
 690     }
 691
 692     if (!style->stroke.isNone()) {
 693         sp_print_stroke (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
 694     }
 695
 696     /* TODO: make code prettier: lots of variables can be taken out of the loop! */
 697     Geom::PathVector const & pathv = shape->curve->get_pathvector();
 698     for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
 699         if ( shape->marker[SP_MARKER_LOC_START] || shape->marker[SP_MARKER_LOC]) {
 700             Geom::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
 701             if (shape->marker[SP_MARKER_LOC_START]) {
 702                 sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC_START], tr, style, ctx);
 703             }
 704             if (shape->marker[SP_MARKER_LOC]) {
 705                 sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC], tr, style, ctx);
 706             }
 707         }
 708
 709         if ( (shape->marker[SP_MARKER_LOC_MID] || shape->marker[SP_MARKER_LOC]) && (path_it->size_default() > 1) ) {
 710             Geom::Path::const_iterator curve_it1 = path_it->begin();      // incoming curve
 711             Geom::Path::const_iterator curve_it2 = ++(path_it->begin());  // outgoing curve
 712             while (curve_it2 != path_it->end_default())
 713             {
 714                 /* Put marker between curve_it1 and curve_it2.
 715                  * Loop to end_default (so including closing segment), because when a path is closed,
 716                  * there should be a midpoint marker between last segment and closing straight line segment */
 717                 Geom::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
 718
 719                 if (shape->marker[SP_MARKER_LOC_MID]) {
 720                     sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC_MID], tr, style, ctx);
 721                 }
 722                 if (shape->marker[SP_MARKER_LOC]) {
 723                     sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC], tr, style, ctx);
 724                 }
 725
 726                 ++curve_it1;
 727                 ++curve_it2;
 728             }
 729         }
 730
 731         if ( shape->marker[SP_MARKER_LOC_END] || shape->marker[SP_MARKER_LOC]) {
 732             /* Get reference to last curve in the path.
 733              * For moveto-only path, this returns the "closing line segment". */
 734             unsigned int index = path_it->size_default();
 735             if (index > 0) {
 736                 index--;
 737             }
 738             Geom::Curve const &lastcurve = (*path_it)[index];
 739
 740             Geom::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
 741
 742             if (shape->marker[SP_MARKER_LOC_END]) {
 743                 sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC_END], tr, style, ctx);
 744             }
 745             if (shape->marker[SP_MARKER_LOC]) {
 746                 sp_shape_print_invoke_marker_printing(shape->marker[SP_MARKER_LOC], tr, style, ctx);
 747             }
 748         }
 749     }
 750
 751         if (add_comments) {
 752             gchar * comment = g_strdup_printf("end '%s'",
 753                                               SP_OBJECT(item)->defaultLabel());
 754             sp_print_comment(ctx, comment);
 755             g_free(comment);
 756         }
 757 }
 758
 759 /**
 760  * Sets style, path, and paintbox.  Updates marker views, including dimensions.
 761  */
 762 static NRArenaItem *
 763 sp_shape_show (SPItem *item, NRArena *arena, unsigned int /*key*/, unsigned int /*flags*/)
 764 {
 765     SPObject *object = SP_OBJECT(item);
 766     SPShape *shape = SP_SHAPE(item);
 767
 768     NRArenaItem *arenaitem = NRArenaShape::create(arena);
 769     NRArenaShape * const s = NR_ARENA_SHAPE(arenaitem);
 770     nr_arena_shape_set_style(s, object->style);
 771     nr_arena_shape_set_path(s, shape->curve, false);
 772     Geom::OptRect paintbox = item->getBounds(Geom::identity());
 773     if (paintbox) {
 774         s->setPaintBox(*paintbox);
 775     }
 776
 777     /* This stanza checks that an object's marker style agrees with
 778      * the marker objects it has allocated.  sp_shape_set_marker ensures
 779      * that the appropriate marker objects are present (or absent) to
 780      * match the style.
 781      */
 782     for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
 783         sp_shape_set_marker (object, i, object->style->marker[i].value);
 784       }
 785
 786     if (sp_shape_has_markers (shape)) {
 787
 788         /* provide key and dimension the marker views */
 789         if (!arenaitem->key) {
 790             NR_ARENA_ITEM_SET_KEY (arenaitem, sp_item_display_key_new (SP_MARKER_LOC_QTY));
 791         }
 792
 793         for (int i = 0; i < SP_MARKER_LOC_QTY; i++) {
 794             if (shape->marker[i]) {
 795                 sp_marker_show_dimension ((SPMarker *) shape->marker[i],
 796                                           NR_ARENA_ITEM_GET_KEY (arenaitem) + i,
 797                                           sp_shape_number_of_markers (shape, i));
 798             }
 799         }
 800
 801         /* Update marker views */
 802         sp_shape_update_marker_view (shape, arenaitem);
 803     }
 804
 805     return arenaitem;
 806 }
 807
 808 /**
 809  * Hides/removes marker views from the shape.
 810  */
 811 static void
 812 sp_shape_hide (SPItem *item, unsigned int key)
 813 {
 814     SPShape *shape;
 815     SPItemView *v;
 816     int i;
 817
 818     shape = (SPShape *) item;
 819
 820     for (i=0; i<SP_MARKER_LOC_QTY; i++) {
 821       if (shape->marker[i]) {
 822         for (v = item->display; v != NULL; v = v->next) {
 823                 if (key == v->key) {
 824           sp_marker_hide ((SPMarker *) shape->marker[i],
 825                                     NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
 826                 }
 827         }
 828       }
 829     }
 830
 831     if (((SPItemClass *) parent_class)->hide) {
 832       ((SPItemClass *) parent_class)->hide (item, key);
 833     }
 834 }
 835
 836 /**
 837 * \param shape Shape.
 838 * \return TRUE if the shape has any markers, or FALSE if not.
 839 */
 840 int
 841 sp_shape_has_markers (SPShape const *shape)
 842 {
 843     /* Note, we're ignoring 'marker' settings, which technically should apply for
 844        all three settings.  This should be fixed later such that if 'marker' is
 845        specified, then all three should appear. */
 846
 847     return (
 848         shape->curve &&
 849         (shape->marker[SP_MARKER_LOC] ||
 850          shape->marker[SP_MARKER_LOC_START] ||
 851          shape->marker[SP_MARKER_LOC_MID] ||
 852          shape->marker[SP_MARKER_LOC_END])
 853         );
 854 }
 855
 856
 857 /**
 858 * \param shape Shape.
 859 * \param type Marker type (e.g. SP_MARKER_LOC_START)
 860 * \return Number of markers that the shape has of this type.
 861 */
 862 int
 863 sp_shape_number_of_markers (SPShape *shape, int type)
 864 {
 865     Geom::PathVector const & pathv = shape->curve->get_pathvector();
 866
 867     switch(type) {
 868         case SP_MARKER_LOC:
 869         {
 870             if ( shape->marker[SP_MARKER_LOC] ) {
 871                 guint n = 2*pathv.size();
 872                 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
 873                     n += path_it->size();
 874                     n += path_it->closed() ? 1 : 0;
 875                 }
 876                 return n;
 877             } else {
 878                 return 0;
 879             }
 880         }
 881         case SP_MARKER_LOC_START:
 882             return shape->marker[SP_MARKER_LOC_START] ? pathv.size() : 0;
 883
 884         case SP_MARKER_LOC_MID:
 885         {
 886             if ( shape->marker[SP_MARKER_LOC_MID] ) {
 887             guint n = 0;
 888                 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
 889                     n += path_it->size();
 890                     n += path_it->closed() ? 1 : 0;
 891                 }
 892                 return n;
 893             } else {
 894                 return 0;
 895             }
 896         }
 897
 898         case SP_MARKER_LOC_END:
 899         {
 900             return shape->marker[SP_MARKER_LOC_END] ? pathv.size() : 0;
 901         }
 902
 903         default:
 904             return 0;
 905     }
 906 }
 907
 908 /**
 909  * Checks if the given marker is used in the shape, and if so, it
 910  * releases it by calling sp_marker_hide.  Also detaches signals
 911  * and unrefs the marker from the shape.
 912  */
 913 static void
 914 sp_shape_marker_release (SPObject *marker, SPShape *shape)
 915 {
 916     SPItem *item;
 917     int i;
 918
 919     item = (SPItem *) shape;
 920
 921     for (i = 0; i < SP_MARKER_LOC_QTY; i++) {
 922         if (marker == shape->marker[i]) {
 923             SPItemView *v;
 924             /* Hide marker */
 925             for (v = item->display; v != NULL; v = v->next) {
 926               sp_marker_hide ((SPMarker *) (shape->marker[i]), NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
 927               /* fixme: Do we need explicit remove here? (Lauris) */
 928               /* nr_arena_item_set_mask (v->arenaitem, NULL); */
 929             }
 930             /* Detach marker */
 931             shape->release_connect[i].disconnect();
 932             shape->modified_connect[i].disconnect();
 933             shape->marker[i] = sp_object_hunref (shape->marker[i], item);
 934         }
 935     }
 936 }
 937
 938 /**
 939  * No-op.  Exists for handling 'modified' messages
 940  */
 941 static void
 942 sp_shape_marker_modified (SPObject */*marker*/, guint /*flags*/, SPItem */*item*/)
 943 {
 944     /* I think mask does update automagically */
 945     /* g_warning ("Item %s mask %s modified", SP_OBJECT_ID (item), SP_OBJECT_ID (mask)); */
 946 }
 947
 948 /**
 949  * Adds a new marker to shape object at the location indicated by key.  value
 950  * must be a valid URI reference resolvable from the shape object (i.e., present
 951  * in the document <defs>).  If the shape object already has a marker
 952  * registered at the given position, it is removed first.  Then the
 953  * new marker is hrefed and its signals connected.
 954  */
 955 void
 956 sp_shape_set_marker (SPObject *object, unsigned int key, const gchar *value)
 957 {
 958     SPItem *item = (SPItem *) object;
 959     SPShape *shape = (SPShape *) object;
 960
 961     if (key > SP_MARKER_LOC_END) {
 962         return;
 963     }
 964
 965     SPObject *mrk = sp_css_uri_reference_resolve (SP_OBJECT_DOCUMENT (object), value);
 966     if (mrk != shape->marker[key]) {
 967         if (shape->marker[key]) {
 968             SPItemView *v;
 969
 970             /* Detach marker */
 971             shape->release_connect[key].disconnect();
 972             shape->modified_connect[key].disconnect();
 973
 974             /* Hide marker */
 975             for (v = item->display; v != NULL; v = v->next) {
 976                 sp_marker_hide ((SPMarker *) (shape->marker[key]),
 977                                 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + key);
 978                 /* fixme: Do we need explicit remove here? (Lauris) */
 979                 /* nr_arena_item_set_mask (v->arenaitem, NULL); */
 980             }
 981
 982             /* Unref marker */
 983             shape->marker[key] = sp_object_hunref (shape->marker[key], object);
 984         }
 985         if (SP_IS_MARKER (mrk)) {
 986             shape->marker[key] = sp_object_href (mrk, object);
 987             shape->release_connect[key] = mrk->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_shape_marker_release), shape));
 988             shape->modified_connect[key] = mrk->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_shape_marker_modified), shape));
 989         }
 990     }
 991 }
 992
 993
 994
 995 /* Shape section */
 996
 997 /**
 998  * Calls any registered handlers for the set_shape action
 999  */
1000 void
1001 sp_shape_set_shape (SPShape *shape)
1002 {
1003     g_return_if_fail (shape != NULL);
1004     g_return_if_fail (SP_IS_SHAPE (shape));
1005
1006     if (SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape) {
1007       SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape (shape);
1008     }
1009 }
1010
1011 /**
1012  * Adds a curve to the shape.  If owner is specified, a reference
1013  * will be made, otherwise the curve will be copied into the shape.
1014  * Any existing curve in the shape will be unreferenced first.
1015  * This routine also triggers a request to update the display.
1016  */
1017 void
1018 sp_shape_set_curve (SPShape *shape, SPCurve *curve, unsigned int owner)
1019 {
1020     if (shape->curve) {
1021         shape->curve = shape->curve->unref();
1022     }
1023     if (curve) {
1024         if (owner) {
1025             shape->curve = curve->ref();
1026         } else {
1027             shape->curve = curve->copy();
1028         }
1029     }
1030         SP_OBJECT(shape)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
1031 }
1032
1033 /**
1034  * Return duplicate of curve (if any exists) or NULL if there is no curve
1035  */
1036 SPCurve *
1037 sp_shape_get_curve (SPShape *shape)
1038 {
1039     if (shape->curve) {
1040         return shape->curve->copy();
1041     }
1042     return NULL;
1043 }
1044
1045 /**
1046  * Same as sp_shape_set_curve but without updating the display
1047  */
1048 void
1049 sp_shape_set_curve_insync (SPShape *shape, SPCurve *curve, unsigned int owner)
1050 {
1051     if (shape->curve) {
1052         shape->curve = shape->curve->unref();
1053     }
1054     if (curve) {
1055         if (owner) {
1056             shape->curve = curve->ref();
1057         } else {
1058             shape->curve = curve->copy();
1059         }
1060     }
1061 }
1062
1063 /**
1064  * Return all nodes in a path that are to be considered for snapping
1065  */
1066 static void sp_shape_snappoints(SPItem const *item, bool const target, SnapPointsWithType &p, Inkscape::SnapPreferences const *snapprefs)
1067 {
1068     g_assert(item != NULL);
1069     g_assert(SP_IS_SHAPE(item));
1070
1071     SPShape const *shape = SP_SHAPE(item);
1072     if (shape->curve == NULL) {
1073         return;
1074     }
1075
1076     // Help enforcing strict snapping, i.e. only return nodes when we're snapping nodes to nodes or a guide to nodes
1077     if (!(snapprefs->getSnapModeNode() || snapprefs->getSnapModeGuide())) {
1078         return;
1079     }
1080
1081     Geom::PathVector const &pathv = shape->curve->get_pathvector();
1082     if (pathv.empty())
1083         return;
1084
1085     Geom::Matrix const i2d (sp_item_i2d_affine (item));
1086
1087     int type;
1088
1089         if (snapprefs->getSnapObjectMidpoints()) {
1090                 Geom::OptRect bbox = item->getBounds(sp_item_i2d_affine(item));
1091                 if (bbox) {
1092                         type = target ? int(Inkscape::SNAPTARGET_OBJECT_MIDPOINT) : int(Inkscape::SNAPSOURCE_OBJECT_MIDPOINT);
1093                         p.push_back(std::make_pair(bbox->midpoint(), type));
1094                 }
1095         }
1096
1097     for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
1098         if (snapprefs->getSnapToItemNode()) {
1099                 type = target ? int(Inkscape::SNAPTARGET_NODE_CUSP) : int(Inkscape::SNAPSOURCE_NODE_CUSP);
1100                 p.push_back(std::make_pair(path_it->initialPoint() * i2d, type));
1101         }
1102
1103         Geom::Path::const_iterator curve_it1 = path_it->begin();      // incoming curve
1104         Geom::Path::const_iterator curve_it2 = ++(path_it->begin());  // outgoing curve
1105         while (curve_it2 != path_it->end_closed())
1106         {
1107             /* Test whether to add the node between curve_it1 and curve_it2.
1108              * Loop to end_closed (so always including closing segment); the last node to be added
1109              * is the node between the closing segment and the segment before that, regardless
1110              * of the path being closed or not. If the path is closed, the final point was already added by
1111              * adding the initial point. */
1112
1113             Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2);
1114
1115             bool c1 = snapprefs->getSnapToItemNode() && (nodetype == Geom::NODE_CUSP || nodetype == Geom::NODE_NONE);
1116             bool c2 = snapprefs->getSnapSmoothNodes() && (nodetype == Geom::NODE_SMOOTH || nodetype == Geom::NODE_SYMM);
1117
1118             if (c1 || c2) {
1119                 type = target ? int(Inkscape::SNAPTARGET_NODE_CUSP) : int(Inkscape::SNAPSOURCE_NODE_CUSP);
1120                                 p.push_back(std::make_pair(curve_it1->finalPoint() * i2d, type));
1121             }
1122
1123                         // Consider midpoints of line segments for snapping
1124                         if (snapprefs->getSnapLineMidpoints()) { // only do this when we're snapping nodes (enforce strict snapping)
1125                                 if (Geom::LineSegment const* line_segment = dynamic_cast<Geom::LineSegment const*>(&(*curve_it1))) {
1126                                         type = target ? int(Inkscape::SNAPTARGET_LINE_MIDPOINT) : int(Inkscape::SNAPSOURCE_LINE_MIDPOINT);
1127                                         p.push_back(std::make_pair(Geom::middle_point(*line_segment) * i2d, type));
1128                                 }
1129                         }
1130
1131             ++curve_it1;
1132             ++curve_it2;
1133         }
1134
1135         // Find the internal intersections of each path and consider these for snapping
1136         // (using "Method 1" as described in Inkscape::ObjectSnapper::_collectNodes())
1137         if (snapprefs->getSnapIntersectionCS()) {
1138             Geom::Crossings cs;
1139             cs = self_crossings(*path_it);
1140             if (cs.size() > 0) { // There might be multiple intersections...
1141                 for (Geom::Crossings::const_iterator i = cs.begin(); i != cs.end(); i++) {
1142                     Geom::Point p_ix = (*path_it).pointAt((*i).ta);
1143                     type = target ? int(Inkscape::SNAPTARGET_PATH_INTERSECTION) : int(Inkscape::SNAPSOURCE_PATH_INTERSECTION);
1144                     p.push_back(std::make_pair(p_ix * i2d, type));
1145                 }
1146             }
1147         }
1148     }
1149
1150 }
1151
1152 /*
1153   Local Variables:
1154   mode:c++
1155   c-file-style:"stroustrup"
1156   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1157   indent-tabs-mode:nil
1158   fill-column:99
1159   End:
1160 */
1161 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :