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 "helper/geom.h"
27 #include "helper/geom-nodetype.h"
29 #include <sigc++/functors/ptr_fun.h>
30 #include <sigc++/adaptors/bind.h>
32 #include "macros.h"
33 #include "display/nr-arena-shape.h"
34 #include "display/curve.h"
35 #include "print.h"
36 #include "document.h"
37 #include "style.h"
38 #include "marker.h"
39 #include "sp-path.h"
40 #include "prefs-utils.h"
41 #include "attributes.h"
43 #include "live_effects/lpeobject.h"
44 #include "uri.h"
45 #include "extract-uri.h"
46 #include "uri-references.h"
47 #include "bad-uri-exception.h"
48 #include "xml/repr.h"
50 #include "util/mathfns.h" // for triangle_area()
52 #define noSHAPE_VERBOSE
54 static void sp_shape_class_init (SPShapeClass *klass);
55 static void sp_shape_init (SPShape *shape);
56 static void sp_shape_finalize (GObject *object);
58 static void sp_shape_build (SPObject * object, SPDocument * document, Inkscape::XML::Node * repr);
59 static void sp_shape_release (SPObject *object);
61 static void sp_shape_set(SPObject *object, unsigned key, gchar const *value);
62 static void sp_shape_update (SPObject *object, SPCtx *ctx, unsigned int flags);
63 static void sp_shape_modified (SPObject *object, unsigned int flags);
64 static Inkscape::XML::Node *sp_shape_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags);
66 static void sp_shape_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const flags);
67 void sp_shape_print (SPItem * item, SPPrintContext * ctx);
68 static NRArenaItem *sp_shape_show (SPItem *item, NRArena *arena, unsigned int key, unsigned int flags);
69 static void sp_shape_hide (SPItem *item, unsigned int key);
70 static void sp_shape_snappoints (SPItem const *item, SnapPointsIter p);
72 static void sp_shape_update_marker_view (SPShape *shape, NRArenaItem *ai);
74 static SPLPEItemClass *parent_class;
76 /**
77 * Registers the SPShape class with Gdk and returns its type number.
78 */
79 GType
80 sp_shape_get_type (void)
81 {
82 static GType type = 0;
83 if (!type) {
84 GTypeInfo info = {
85 sizeof (SPShapeClass),
86 NULL, NULL,
87 (GClassInitFunc) sp_shape_class_init,
88 NULL, NULL,
89 sizeof (SPShape),
90 16,
91 (GInstanceInitFunc) sp_shape_init,
92 NULL, /* value_table */
93 };
94 type = g_type_register_static (SP_TYPE_LPE_ITEM, "SPShape", &info, (GTypeFlags)0);
95 }
96 return type;
97 }
99 /**
100 * Initializes a SPShapeClass object. Establishes the function pointers to the class'
101 * member routines in the class vtable, and sets pointers to parent classes.
102 */
103 static void
104 sp_shape_class_init (SPShapeClass *klass)
105 {
106 GObjectClass *gobject_class = G_OBJECT_CLASS(klass);
107 SPObjectClass *sp_object_class = SP_OBJECT_CLASS(klass);
108 SPItemClass * item_class = SP_ITEM_CLASS(klass);
109 SPLPEItemClass * lpe_item_class = SP_LPE_ITEM_CLASS(klass);
111 parent_class = (SPLPEItemClass *)g_type_class_peek_parent (klass);
113 gobject_class->finalize = sp_shape_finalize;
115 sp_object_class->build = sp_shape_build;
116 sp_object_class->release = sp_shape_release;
117 sp_object_class->set = sp_shape_set;
118 sp_object_class->update = sp_shape_update;
119 sp_object_class->modified = sp_shape_modified;
120 sp_object_class->write = sp_shape_write;
122 item_class->bbox = sp_shape_bbox;
123 item_class->print = sp_shape_print;
124 item_class->show = sp_shape_show;
125 item_class->hide = sp_shape_hide;
126 item_class->snappoints = sp_shape_snappoints;
127 lpe_item_class->update_patheffect = NULL;
129 klass->set_shape = NULL;
130 }
132 /**
133 * Initializes an SPShape object.
134 */
135 static void
136 sp_shape_init (SPShape *shape)
137 {
138 for ( int i = 0 ; i < SP_MARKER_LOC_QTY ; i++ ) {
139 new (&shape->release_connect[i]) sigc::connection();
140 new (&shape->modified_connect[i]) sigc::connection();
141 }
142 }
144 static void
145 sp_shape_finalize (GObject *object)
146 {
147 SPShape *shape=(SPShape *)object;
149 for ( int i = 0 ; i < SP_MARKER_LOC_QTY ; i++ ) {
150 shape->release_connect[i].disconnect();
151 shape->release_connect[i].~connection();
152 shape->modified_connect[i].disconnect();
153 shape->modified_connect[i].~connection();
154 }
156 if (((GObjectClass *) (parent_class))->finalize) {
157 (* ((GObjectClass *) (parent_class))->finalize)(object);
158 }
159 }
161 /**
162 * Virtual build callback for SPMarker.
163 *
164 * This is to be invoked immediately after creation of an SPShape.
165 *
166 * \see sp_object_build()
167 */
168 static void
169 sp_shape_build (SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
170 {
171 if (((SPObjectClass *) (parent_class))->build) {
172 (*((SPObjectClass *) (parent_class))->build) (object, document, repr);
173 }
174 }
176 /**
177 * Removes, releases and unrefs all children of object
178 *
179 * This is the inverse of sp_shape_build(). It must be invoked as soon
180 * as the shape is removed from the tree, even if it is still referenced
181 * by other objects. This routine also disconnects/unrefs markers and
182 * curves attached to it.
183 *
184 * \see sp_object_release()
185 */
186 static void
187 sp_shape_release (SPObject *object)
188 {
189 SPItem *item;
190 SPShape *shape;
191 SPItemView *v;
192 int i;
194 item = (SPItem *) object;
195 shape = (SPShape *) object;
197 for (i=SP_MARKER_LOC_START; i<SP_MARKER_LOC_QTY; i++) {
198 if (shape->marker[i]) {
199 sp_signal_disconnect_by_data (shape->marker[i], object);
200 for (v = item->display; v != NULL; v = v->next) {
201 sp_marker_hide ((SPMarker *) shape->marker[i], NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
202 }
203 shape->marker[i] = sp_object_hunref (shape->marker[i], object);
204 }
205 }
206 if (shape->curve) {
207 shape->curve = shape->curve->unref();
208 }
210 if (((SPObjectClass *) parent_class)->release) {
211 ((SPObjectClass *) parent_class)->release (object);
212 }
213 }
217 static void
218 sp_shape_set(SPObject *object, unsigned int key, gchar const *value)
219 {
220 if (((SPObjectClass *) parent_class)->set) {
221 ((SPObjectClass *) parent_class)->set(object, key, value);
222 }
223 }
225 static Inkscape::XML::Node *
226 sp_shape_write(SPObject *object, Inkscape::XML::Document *doc, Inkscape::XML::Node *repr, guint flags)
227 {
228 if (((SPObjectClass *)(parent_class))->write) {
229 ((SPObjectClass *)(parent_class))->write(object, doc, repr, flags);
230 }
232 return repr;
233 }
235 /**
236 * Updates the shape when its attributes have changed. Also establishes
237 * marker objects to match the style settings.
238 */
239 static void
240 sp_shape_update (SPObject *object, SPCtx *ctx, unsigned int flags)
241 {
242 SPItem *item = (SPItem *) object;
243 SPShape *shape = (SPShape *) object;
245 if (((SPObjectClass *) (parent_class))->update) {
246 (* ((SPObjectClass *) (parent_class))->update) (object, ctx, flags);
247 }
249 /* This stanza checks that an object's marker style agrees with
250 * the marker objects it has allocated. sp_shape_set_marker ensures
251 * that the appropriate marker objects are present (or absent) to
252 * match the style.
253 */
254 /* TODO: It would be nice if this could be done at an earlier level */
255 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
256 sp_shape_set_marker (object, i, object->style->marker[i].value);
257 }
259 if (flags & (SP_OBJECT_STYLE_MODIFIED_FLAG | SP_OBJECT_VIEWPORT_MODIFIED_FLAG)) {
260 SPStyle *style;
261 style = SP_OBJECT_STYLE (object);
262 if (style->stroke_width.unit == SP_CSS_UNIT_PERCENT) {
263 SPItemCtx *ictx = (SPItemCtx *) ctx;
264 double const aw = 1.0 / NR::expansion(ictx->i2vp);
265 style->stroke_width.computed = style->stroke_width.value * aw;
266 for (SPItemView *v = ((SPItem *) (shape))->display; v != NULL; v = v->next) {
267 nr_arena_shape_set_style ((NRArenaShape *) v->arenaitem, style);
268 }
269 }
270 }
272 if (flags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_PARENT_MODIFIED_FLAG)) {
273 /* This is suboptimal, because changing parent style schedules recalculation */
274 /* But on the other hand - how can we know that parent does not tie style and transform */
275 boost::optional<NR::Rect> paintbox = SP_ITEM(object)->getBounds(NR::identity());
276 for (SPItemView *v = SP_ITEM (shape)->display; v != NULL; v = v->next) {
277 NRArenaShape * const s = NR_ARENA_SHAPE(v->arenaitem);
278 if (flags & SP_OBJECT_MODIFIED_FLAG) {
279 nr_arena_shape_set_path(s, shape->curve, (flags & SP_OBJECT_USER_MODIFIED_FLAG_B));
280 }
281 if (paintbox) {
282 s->setPaintBox(*paintbox);
283 }
284 }
285 }
287 if (sp_shape_has_markers (shape)) {
289 /* Dimension marker views */
290 for (SPItemView *v = item->display; v != NULL; v = v->next) {
292 if (!v->arenaitem->key) {
293 /* Get enough keys for all, start, mid and end marker types,
294 ** and set this view's arenaitem key to the first of these keys.
295 */
296 NR_ARENA_ITEM_SET_KEY (
297 v->arenaitem,
298 sp_item_display_key_new (SP_MARKER_LOC_QTY)
299 );
300 }
302 for (int i = 0 ; i < SP_MARKER_LOC_QTY ; i++) {
303 if (shape->marker[i]) {
304 sp_marker_show_dimension ((SPMarker *) shape->marker[i],
305 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i - SP_MARKER_LOC,
306 sp_shape_number_of_markers (shape, i));
307 }
308 }
309 }
311 /* Update marker views */
312 for (SPItemView *v = item->display; v != NULL; v = v->next) {
313 sp_shape_update_marker_view (shape, v->arenaitem);
314 }
315 }
316 }
318 /**
319 * Calculate the transform required to get a marker's path object in the
320 * right place for particular path segment on a shape.
321 *
322 * \see sp_shape_marker_update_marker_view.
323 *
324 * From SVG spec:
325 * The axes of the temporary new user coordinate system are aligned according to the orient attribute on the 'marker'
326 * element and the slope of the curve at the given vertex. (Note: if there is a discontinuity at a vertex, the slope
327 * is the average of the slopes of the two segments of the curve that join at the given vertex. If a slope cannot be
328 * determined, the slope is assumed to be zero.)
329 *
330 * Reference: http://www.w3.org/TR/SVG11/painting.html#MarkerElement, the `orient' attribute.
331 * Reference for behaviour of zero-length segments:
332 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes
333 */
334 Geom::Matrix
335 sp_shape_marker_get_transform(Geom::Curve const & c1, Geom::Curve const & c2)
336 {
337 Geom::Point p = c1.pointAt(1);
338 Geom::Curve * c1_reverse = c1.reverse();
339 Geom::Point tang1 = - c1_reverse->unitTangentAt(0);
340 delete c1_reverse;
341 Geom::Point tang2 = c2.unitTangentAt(0);
343 double const angle1 = Geom::atan2(tang1);
344 double const angle2 = Geom::atan2(tang2);
346 double ret_angle;
347 ret_angle = .5 * (angle1 + angle2);
349 if ( fabs( angle2 - angle1 ) > M_PI ) {
350 /* ret_angle is in the middle of the larger of the two sectors between angle1 and
351 * angle2, so flip it by 180degrees to force it to the middle of the smaller sector.
352 *
353 * (Imagine a circle with rays drawn at angle1 and angle2 from the centre of the
354 * circle. Those two rays divide the circle into two sectors.)
355 */
356 ret_angle += M_PI;
357 }
359 return Geom::Rotate(ret_angle) * Geom::Translate(p);
360 }
361 Geom::Matrix
362 sp_shape_marker_get_transform_at_start(Geom::Curve const & c)
363 {
364 Geom::Point p = c.pointAt(0);
365 Geom::Matrix ret = Geom::Translate(p);
367 if ( !c.isDegenerate() ) {
368 Geom::Point tang = c.unitTangentAt(0);
369 double const angle = Geom::atan2(tang);
370 ret = Geom::Rotate(angle) * Geom::Translate(p);
371 } else {
372 /* FIXME: the svg spec says to search for a better alternative than zero angle directionality:
373 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */
374 }
376 return ret;
377 }
378 Geom::Matrix
379 sp_shape_marker_get_transform_at_end(Geom::Curve const & c)
380 {
381 Geom::Point p = c.pointAt(1);
382 Geom::Matrix ret = Geom::Translate(p);
384 if ( !c.isDegenerate() ) {
385 Geom::Curve * c_reverse = c.reverse();
386 Geom::Point tang = - c_reverse->unitTangentAt(0);
387 delete c_reverse;
388 double const angle = Geom::atan2(tang);
389 ret = Geom::Rotate(angle) * Geom::Translate(p);
390 } else {
391 /* FIXME: the svg spec says to search for a better alternative than zero angle directionality:
392 * http://www.w3.org/TR/SVG11/implnote.html#PathElementImplementationNotes */
393 }
395 return ret;
396 }
398 /**
399 * Updates the instances (views) of a given marker in a shape.
400 * Marker views have to be scaled already. The transformation
401 * is retrieved and then shown by calling sp_marker_show_instance.
402 *
403 * TODO: correctly handle the 'marker' attribute.
404 * "Using the marker property from a style sheet is equivalent to using all three (start, mid, end)."
405 * See painting-marker-03-f.svg in SVG 1.1 Full test suite.
406 */
407 static void
408 sp_shape_update_marker_view (SPShape *shape, NRArenaItem *ai)
409 {
410 SPStyle *style = ((SPObject *) shape)->style;
412 // position arguments to sp_marker_show_instance, basically counts the amount of markers.
413 int start_pos = 0;
414 int mid_pos = 0;
415 int end_pos = 0;
417 Geom::PathVector const & pathv = shape->curve->get_pathvector();
418 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
419 if ( shape->marker[SP_MARKER_LOC_START] ) {
420 Geom::Matrix const m (sp_shape_marker_get_transform_at_start(path_it->front()));
421 sp_marker_show_instance ((SPMarker* ) shape->marker[SP_MARKER_LOC_START], ai,
422 NR_ARENA_ITEM_GET_KEY(ai) + SP_MARKER_LOC_START, start_pos, m,
423 style->stroke_width.computed);
424 start_pos++;
425 }
427 if ( shape->marker[SP_MARKER_LOC_MID] && (path_it->size_default() > 1) ) {
428 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
429 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
430 while (curve_it2 != path_it->end_default())
431 {
432 /* Put marker between curve_it1 and curve_it2.
433 * Loop to end_default (so including closing segment), because when a path is closed,
434 * there should be a midpoint marker between last segment and closing straight line segment
435 */
436 Geom::Matrix const m (sp_shape_marker_get_transform(*curve_it1, *curve_it2));
437 sp_marker_show_instance ((SPMarker* ) shape->marker[SP_MARKER_LOC_MID], ai,
438 NR_ARENA_ITEM_GET_KEY(ai) + SP_MARKER_LOC_MID, mid_pos, m,
439 style->stroke_width.computed);
440 mid_pos++;
442 ++curve_it1;
443 ++curve_it2;
444 }
445 }
447 if ( shape->marker[SP_MARKER_LOC_END] ) {
448 /* Get reference to last curve in the path.
449 * For moveto-only path, this returns the "closing line segment". */
450 unsigned int index = path_it->size_default();
451 if (index > 0) {
452 index--;
453 }
454 Geom::Curve const &lastcurve = (*path_it)[index];
456 Geom::Matrix const m = sp_shape_marker_get_transform_at_end(lastcurve);
457 sp_marker_show_instance ((SPMarker* ) shape->marker[SP_MARKER_LOC_END], ai,
458 NR_ARENA_ITEM_GET_KEY(ai) + SP_MARKER_LOC_END, end_pos, m,
459 style->stroke_width.computed);
460 end_pos++;
461 }
462 }
463 }
465 /**
466 * Sets modified flag for all sub-item views.
467 */
468 static void
469 sp_shape_modified (SPObject *object, unsigned int flags)
470 {
471 SPShape *shape = SP_SHAPE (object);
473 if (((SPObjectClass *) (parent_class))->modified) {
474 (* ((SPObjectClass *) (parent_class))->modified) (object, flags);
475 }
477 if (flags & SP_OBJECT_STYLE_MODIFIED_FLAG) {
478 for (SPItemView *v = SP_ITEM (shape)->display; v != NULL; v = v->next) {
479 nr_arena_shape_set_style (NR_ARENA_SHAPE (v->arenaitem), object->style);
480 }
481 }
482 }
484 /**
485 * Calculates the bounding box for item, storing it into bbox.
486 * This also includes the bounding boxes of any markers included in the shape.
487 */
488 static void sp_shape_bbox(SPItem const *item, NRRect *bbox, NR::Matrix const &transform, unsigned const flags)
489 {
490 SPShape const *shape = SP_SHAPE (item);
492 if (shape->curve) {
494 NRRect cbbox;
496 Geom::Rect geombbox = bounds_exact_transformed(shape->curve->get_pathvector(), transform);
497 cbbox.x0 = geombbox[0][0];
498 cbbox.y0 = geombbox[1][0];
499 cbbox.x1 = geombbox[0][1];
500 cbbox.y1 = geombbox[1][1];
502 if ((SPItem::BBoxType) flags != SPItem::GEOMETRIC_BBOX) {
504 SPStyle* style=SP_OBJECT_STYLE (item);
505 if (!style->stroke.isNone()) {
506 double const scale = expansion(transform);
507 if ( fabs(style->stroke_width.computed * scale) > 0.01 ) { // sinon c'est 0=oon veut pas de bord
508 double const width = MAX(0.125, style->stroke_width.computed * scale);
509 if ( fabs(cbbox.x1-cbbox.x0) > -0.00001 && fabs(cbbox.y1-cbbox.y0) > -0.00001 ) {
510 cbbox.x0-=0.5*width;
511 cbbox.x1+=0.5*width;
512 cbbox.y0-=0.5*width;
513 cbbox.y1+=0.5*width;
514 }
515 }
516 }
518 // Union with bboxes of the markers, if any
519 if (sp_shape_has_markers (shape)) {
520 /* TODO: make code prettier: lots of variables can be taken out of the loop! */
521 Geom::PathVector const & pathv = shape->curve->get_pathvector();
522 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
523 if ( shape->marker[SP_MARKER_LOC_START] ) {
524 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_START]);
525 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_START]));
527 NR::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
529 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
530 tr = NR::scale(style->stroke_width.computed) * tr;
531 }
533 // total marker transform
534 tr = marker_item->transform * marker->c2p * tr * transform;
536 // get bbox of the marker with that transform
537 NRRect marker_bbox;
538 sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
539 // union it with the shape bbox
540 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
541 }
543 if ( shape->marker[SP_MARKER_LOC_MID] && (path_it->size_default() > 1) ) {
544 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
545 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
546 while (curve_it2 != path_it->end_default())
547 {
548 /* Put marker between curve_it1 and curve_it2.
549 * Loop to end_default (so including closing segment), because when a path is closed,
550 * there should be a midpoint marker between last segment and closing straight line segment */
552 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_MID]);
553 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_MID]));
555 NR::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
557 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
558 tr = NR::scale(style->stroke_width.computed) * tr;
559 }
561 // total marker transform
562 tr = marker_item->transform * marker->c2p * tr * transform;
564 // get bbox of the marker with that transform
565 NRRect marker_bbox;
566 sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
567 // union it with the shape bbox
568 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
570 ++curve_it1;
571 ++curve_it2;
572 }
573 }
575 if ( shape->marker[SP_MARKER_LOC_END] ) {
576 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_END]);
577 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_END]));
579 /* Get reference to last curve in the path.
580 * For moveto-only path, this returns the "closing line segment". */
581 unsigned int index = path_it->size_default();
582 if (index > 0) {
583 index--;
584 }
585 Geom::Curve const &lastcurve = (*path_it)[index];
587 NR::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
589 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
590 tr = NR::scale(style->stroke_width.computed) * tr;
591 }
593 // total marker transform
594 tr = marker_item->transform * marker->c2p * tr * transform;
596 // get bbox of the marker with that transform
597 NRRect marker_bbox;
598 sp_item_invoke_bbox (marker_item, &marker_bbox, tr, true);
599 // union it with the shape bbox
600 nr_rect_d_union (&cbbox, &cbbox, &marker_bbox);
601 }
602 }
603 }
604 }
606 // copy our bbox to the variable we're given
607 *bbox = cbbox;
608 }
609 }
611 /**
612 * Prepares shape for printing. Handles printing of comments for printing
613 * debugging, sizes the item to fit into the document width/height,
614 * applies print fill/stroke, sets transforms for markers, and adds
615 * comment labels.
616 */
617 void
618 sp_shape_print (SPItem *item, SPPrintContext *ctx)
619 {
620 NRRect pbox, dbox, bbox;
622 SPShape *shape = SP_SHAPE(item);
624 if (!shape->curve) return;
626 gint add_comments = prefs_get_int_attribute_limited ("printing.debug", "add-label-comments", 0, 0, 1);
627 if (add_comments) {
628 gchar * comment = g_strdup_printf("begin '%s'",
629 SP_OBJECT(item)->defaultLabel());
630 sp_print_comment(ctx, comment);
631 g_free(comment);
632 }
634 /* fixme: Think (Lauris) */
635 sp_item_invoke_bbox(item, &pbox, NR::identity(), TRUE);
636 dbox.x0 = 0.0;
637 dbox.y0 = 0.0;
638 dbox.x1 = sp_document_width (SP_OBJECT_DOCUMENT (item));
639 dbox.y1 = sp_document_height (SP_OBJECT_DOCUMENT (item));
640 sp_item_bbox_desktop (item, &bbox);
641 NR::Matrix const i2d(sp_item_i2d_affine(item));
643 SPStyle* style = SP_OBJECT_STYLE (item);
645 if (!style->fill.isNone()) {
646 sp_print_fill (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
647 }
649 if (!style->stroke.isNone()) {
650 sp_print_stroke (ctx, shape->curve->get_pathvector(), &i2d, style, &pbox, &dbox, &bbox);
651 }
653 /* TODO: make code prettier: lots of variables can be taken out of the loop! */
654 Geom::PathVector const & pathv = shape->curve->get_pathvector();
655 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
656 if ( shape->marker[SP_MARKER_LOC_START] ) {
657 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_START]);
658 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_START]));
660 NR::Matrix tr(sp_shape_marker_get_transform_at_start(path_it->front()));
662 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
663 tr = NR::scale(style->stroke_width.computed) * tr;
664 }
666 tr = marker_item->transform * marker->c2p * tr;
668 NR::Matrix old_tr = marker_item->transform;
669 marker_item->transform = tr;
670 sp_item_invoke_print (marker_item, ctx);
671 marker_item->transform = old_tr;
672 }
674 if ( shape->marker[SP_MARKER_LOC_MID] && (path_it->size_default() > 1) ) {
675 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
676 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
677 while (curve_it2 != path_it->end_default())
678 {
679 /* Put marker between curve_it1 and curve_it2.
680 * Loop to end_default (so including closing segment), because when a path is closed,
681 * there should be a midpoint marker between last segment and closing straight line segment */
683 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_MID]);
684 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_MID]));
686 NR::Matrix tr(sp_shape_marker_get_transform(*curve_it1, *curve_it2));
688 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
689 tr = NR::scale(style->stroke_width.computed) * tr;
690 }
692 tr = marker_item->transform * marker->c2p * tr;
694 NR::Matrix old_tr = marker_item->transform;
695 marker_item->transform = tr;
696 sp_item_invoke_print (marker_item, ctx);
697 marker_item->transform = old_tr;
699 ++curve_it1;
700 ++curve_it2;
701 }
702 }
704 if ( shape->marker[SP_MARKER_LOC_END] ) {
705 SPMarker* marker = SP_MARKER (shape->marker[SP_MARKER_LOC_END]);
706 SPItem* marker_item = sp_item_first_item_child (SP_OBJECT (shape->marker[SP_MARKER_LOC_END]));
708 /* Get reference to last curve in the path.
709 * For moveto-only path, this returns the "closing line segment". */
710 unsigned int index = path_it->size_default();
711 if (index > 0) {
712 index--;
713 }
714 Geom::Curve const &lastcurve = (*path_it)[index];
716 NR::Matrix tr = sp_shape_marker_get_transform_at_end(lastcurve);
718 if (marker->markerUnits == SP_MARKER_UNITS_STROKEWIDTH) {
719 tr = NR::scale(style->stroke_width.computed) * tr;
720 }
722 tr = marker_item->transform * marker->c2p * tr;
724 NR::Matrix old_tr = marker_item->transform;
725 marker_item->transform = tr;
726 sp_item_invoke_print (marker_item, ctx);
727 marker_item->transform = old_tr;
728 }
729 }
731 if (add_comments) {
732 gchar * comment = g_strdup_printf("end '%s'",
733 SP_OBJECT(item)->defaultLabel());
734 sp_print_comment(ctx, comment);
735 g_free(comment);
736 }
737 }
739 /**
740 * Sets style, path, and paintbox. Updates marker views, including dimensions.
741 */
742 static NRArenaItem *
743 sp_shape_show (SPItem *item, NRArena *arena, unsigned int /*key*/, unsigned int /*flags*/)
744 {
745 SPObject *object = SP_OBJECT(item);
746 SPShape *shape = SP_SHAPE(item);
748 NRArenaItem *arenaitem = NRArenaShape::create(arena);
749 NRArenaShape * const s = NR_ARENA_SHAPE(arenaitem);
750 nr_arena_shape_set_style(s, object->style);
751 nr_arena_shape_set_path(s, shape->curve, false);
752 boost::optional<NR::Rect> paintbox = item->getBounds(NR::identity());
753 if (paintbox) {
754 s->setPaintBox(*paintbox);
755 }
757 if (sp_shape_has_markers (shape)) {
759 /* Dimension the marker views */
760 if (!arenaitem->key) {
761 NR_ARENA_ITEM_SET_KEY (arenaitem, sp_item_display_key_new (SP_MARKER_LOC_QTY));
762 }
764 for (int i = 0; i < SP_MARKER_LOC_QTY; i++) {
765 if (shape->marker[i]) {
766 sp_marker_show_dimension ((SPMarker *) shape->marker[i],
767 NR_ARENA_ITEM_GET_KEY (arenaitem) + i - SP_MARKER_LOC,
768 sp_shape_number_of_markers (shape, i));
769 }
770 }
773 /* Update marker views */
774 sp_shape_update_marker_view (shape, arenaitem);
775 }
777 return arenaitem;
778 }
780 /**
781 * Hides/removes marker views from the shape.
782 */
783 static void
784 sp_shape_hide (SPItem *item, unsigned int key)
785 {
786 SPShape *shape;
787 SPItemView *v;
788 int i;
790 shape = (SPShape *) item;
792 for (i=0; i<SP_MARKER_LOC_QTY; i++) {
793 if (shape->marker[i]) {
794 for (v = item->display; v != NULL; v = v->next) {
795 if (key == v->key) {
796 sp_marker_hide ((SPMarker *) shape->marker[i],
797 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
798 }
799 }
800 }
801 }
803 if (((SPItemClass *) parent_class)->hide) {
804 ((SPItemClass *) parent_class)->hide (item, key);
805 }
806 }
808 /**
809 * \param shape Shape.
810 * \return TRUE if the shape has any markers, or FALSE if not.
811 */
812 int
813 sp_shape_has_markers (SPShape const *shape)
814 {
815 /* Note, we're ignoring 'marker' settings, which technically should apply for
816 all three settings. This should be fixed later such that if 'marker' is
817 specified, then all three should appear. */
819 return (
820 shape->curve &&
821 (shape->marker[SP_MARKER_LOC_START] ||
822 shape->marker[SP_MARKER_LOC_MID] ||
823 shape->marker[SP_MARKER_LOC_END])
824 );
825 }
828 /**
829 * \param shape Shape.
830 * \param type Marker type (e.g. SP_MARKER_LOC_START)
831 * \return Number of markers that the shape has of this type.
832 */
833 int
834 sp_shape_number_of_markers (SPShape *shape, int type)
835 {
836 Geom::PathVector const & pathv = shape->curve->get_pathvector();
838 switch(type) {
839 case SP_MARKER_LOC_START:
840 return shape->marker[SP_MARKER_LOC_START] ? pathv.size() : 0;
842 case SP_MARKER_LOC_MID:
843 {
844 if ( shape->marker[SP_MARKER_LOC_MID] ) {
845 guint n = 0;
846 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
847 n += path_it->size();
848 n += path_it->closed() ? 1 : 0;
849 }
850 return n;
851 } else {
852 return 0;
853 }
854 }
856 case SP_MARKER_LOC_END:
857 {
858 if ( shape->marker[SP_MARKER_LOC_END] ) {
859 guint n = 0;
860 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
861 if (!path_it->empty()) {
862 n++;
863 }
864 }
865 return n;
866 } else {
867 return 0;
868 }
869 }
871 default:
872 return 0;
873 }
874 }
876 /**
877 * Checks if the given marker is used in the shape, and if so, it
878 * releases it by calling sp_marker_hide. Also detaches signals
879 * and unrefs the marker from the shape.
880 */
881 static void
882 sp_shape_marker_release (SPObject *marker, SPShape *shape)
883 {
884 SPItem *item;
885 int i;
887 item = (SPItem *) shape;
889 for (i = SP_MARKER_LOC_START; i < SP_MARKER_LOC_QTY; i++) {
890 if (marker == shape->marker[i]) {
891 SPItemView *v;
892 /* Hide marker */
893 for (v = item->display; v != NULL; v = v->next) {
894 sp_marker_hide ((SPMarker *) (shape->marker[i]), NR_ARENA_ITEM_GET_KEY (v->arenaitem) + i);
895 /* fixme: Do we need explicit remove here? (Lauris) */
896 /* nr_arena_item_set_mask (v->arenaitem, NULL); */
897 }
898 /* Detach marker */
899 sp_signal_disconnect_by_data (shape->marker[i], item);
900 shape->marker[i] = sp_object_hunref (shape->marker[i], item);
901 }
902 }
903 }
905 /**
906 * No-op. Exists for handling 'modified' messages
907 */
908 static void
909 sp_shape_marker_modified (SPObject */*marker*/, guint /*flags*/, SPItem */*item*/)
910 {
911 /* I think mask does update automagically */
912 /* g_warning ("Item %s mask %s modified", SP_OBJECT_ID (item), SP_OBJECT_ID (mask)); */
913 }
915 /**
916 * Adds a new marker to shape object at the location indicated by key. value
917 * must be a valid URI reference resolvable from the shape object (i.e., present
918 * in the document <defs>). If the shape object already has a marker
919 * registered at the given position, it is removed first. Then the
920 * new marker is hrefed and its signals connected.
921 */
922 void
923 sp_shape_set_marker (SPObject *object, unsigned int key, const gchar *value)
924 {
925 SPItem *item = (SPItem *) object;
926 SPShape *shape = (SPShape *) object;
928 if (key < SP_MARKER_LOC_START || key > SP_MARKER_LOC_END) {
929 return;
930 }
932 SPObject *mrk = sp_css_uri_reference_resolve (SP_OBJECT_DOCUMENT (object), value);
933 if (mrk != shape->marker[key]) {
934 if (shape->marker[key]) {
935 SPItemView *v;
937 /* Detach marker */
938 shape->release_connect[key].disconnect();
939 shape->modified_connect[key].disconnect();
941 /* Hide marker */
942 for (v = item->display; v != NULL; v = v->next) {
943 sp_marker_hide ((SPMarker *) (shape->marker[key]),
944 NR_ARENA_ITEM_GET_KEY (v->arenaitem) + key);
945 /* fixme: Do we need explicit remove here? (Lauris) */
946 /* nr_arena_item_set_mask (v->arenaitem, NULL); */
947 }
949 /* Unref marker */
950 shape->marker[key] = sp_object_hunref (shape->marker[key], object);
951 }
952 if (SP_IS_MARKER (mrk)) {
953 shape->marker[key] = sp_object_href (mrk, object);
954 shape->release_connect[key] = mrk->connectRelease(sigc::bind<1>(sigc::ptr_fun(&sp_shape_marker_release), shape));
955 shape->modified_connect[key] = mrk->connectModified(sigc::bind<2>(sigc::ptr_fun(&sp_shape_marker_modified), shape));
956 }
957 }
958 }
962 /* Shape section */
964 /**
965 * Calls any registered handlers for the set_shape action
966 */
967 void
968 sp_shape_set_shape (SPShape *shape)
969 {
970 g_return_if_fail (shape != NULL);
971 g_return_if_fail (SP_IS_SHAPE (shape));
973 if (SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape) {
974 SP_SHAPE_CLASS (G_OBJECT_GET_CLASS (shape))->set_shape (shape);
975 }
976 }
978 /**
979 * Adds a curve to the shape. If owner is specified, a reference
980 * will be made, otherwise the curve will be copied into the shape.
981 * Any existing curve in the shape will be unreferenced first.
982 * This routine also triggers a request to update the display.
983 */
984 void
985 sp_shape_set_curve (SPShape *shape, SPCurve *curve, unsigned int owner)
986 {
987 if (shape->curve) {
988 shape->curve = shape->curve->unref();
989 }
990 if (curve) {
991 if (owner) {
992 shape->curve = curve->ref();
993 } else {
994 shape->curve = curve->copy();
995 }
996 }
997 SP_OBJECT(shape)->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG);
998 }
1000 /**
1001 * Return duplicate of curve (if any exists) or NULL if there is no curve
1002 */
1003 SPCurve *
1004 sp_shape_get_curve (SPShape *shape)
1005 {
1006 if (shape->curve) {
1007 return shape->curve->copy();
1008 }
1009 return NULL;
1010 }
1012 /**
1013 * Same as sp_shape_set_curve but without updating the display
1014 */
1015 void
1016 sp_shape_set_curve_insync (SPShape *shape, SPCurve *curve, unsigned int owner)
1017 {
1018 if (shape->curve) {
1019 shape->curve = shape->curve->unref();
1020 }
1021 if (curve) {
1022 if (owner) {
1023 shape->curve = curve->ref();
1024 } else {
1025 shape->curve = curve->copy();
1026 }
1027 }
1028 }
1030 /**
1031 * Return all nodes in a path that are to be considered for snapping
1032 */
1033 static void sp_shape_snappoints(SPItem const *item, SnapPointsIter p)
1034 {
1035 g_assert(item != NULL);
1036 g_assert(SP_IS_SHAPE(item));
1038 SPShape const *shape = SP_SHAPE(item);
1039 if (shape->curve == NULL) {
1040 return;
1041 }
1043 Geom::PathVector const &pathv = shape->curve->get_pathvector();
1044 if (pathv.empty())
1045 return;
1047 Geom::Matrix const i2d (sp_item_i2d_affine (item));
1049 for(Geom::PathVector::const_iterator path_it = pathv.begin(); path_it != pathv.end(); ++path_it) {
1050 *p = from_2geom(path_it->initialPoint() * i2d);
1052 Geom::Path::const_iterator curve_it1 = path_it->begin(); // incoming curve
1053 Geom::Path::const_iterator curve_it2 = ++(path_it->begin()); // outgoing curve
1054 while (curve_it2 != path_it->end_closed())
1055 {
1056 /* Test whether to add the node between curve_it1 and curve_it2.
1057 * Loop to end_closed (so always including closing segment), the last node to be added
1058 * is the node between the closing segment and the segment before that one. Regardless
1059 * of the path being closed. If the path is closed, the final point was already added by
1060 * adding the initial point. */
1062 Geom::NodeType nodetype = Geom::get_nodetype(*curve_it1, *curve_it2);
1064 // Only add cusp nodes. TODO: Shouldn't this be a preference instead?
1065 if (nodetype == Geom::NODE_NONE) {
1066 *p = from_2geom(curve_it1->finalPoint() * i2d);
1067 }
1068 if (nodetype == Geom::NODE_CUSP) {
1069 *p = from_2geom(curve_it1->finalPoint() * i2d);
1070 }
1072 ++curve_it1;
1073 ++curve_it2;
1074 }
1075 }
1076 }
1078 /*
1079 Local Variables:
1080 mode:c++
1081 c-file-style:"stroustrup"
1082 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1083 indent-tabs-mode:nil
1084 fill-column:99
1085 End:
1086 */
1087 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :