1 /** @file
2 * @brief Helper object for transforming selected items
3 */
4 /* Authors:
5 * Lauris Kaplinski <lauris@kaplinski.com>
6 * bulia byak <buliabyak@users.sf.net>
7 * Carl Hetherington <inkscape@carlh.net>
8 * Diederik van Lierop <mail@diedenrezi.nl>
9 *
10 * Copyright (C) 1999-2002 Lauris Kaplinski
11 * Copyright (C) 1999-2008 Authors
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 #ifdef HAVE_CONFIG_H
17 # include <config.h>
18 #endif
19 #include <cstring>
20 #include <string>
22 #include <2geom/transforms.h>
23 #include <gdk/gdkkeysyms.h>
24 #include "document.h"
25 #include "sp-namedview.h"
26 #include "desktop.h"
27 #include "desktop-handles.h"
28 #include "desktop-style.h"
29 #include "knot.h"
30 #include "snap.h"
31 #include "selection.h"
32 #include "select-context.h"
33 #include "sp-item.h"
34 #include "sp-item-transform.h"
35 #include "seltrans-handles.h"
36 #include "seltrans.h"
37 #include "selection-chemistry.h"
38 #include "sp-metrics.h"
39 #include "verbs.h"
40 #include <glibmm/i18n.h>
41 #include "display/sp-ctrlline.h"
42 #include "preferences.h"
43 #include "xml/repr.h"
44 #include "mod360.h"
45 #include <2geom/angle.h>
46 #include "display/snap-indicator.h"
49 static void sp_remove_handles(SPKnot *knot[], gint num);
51 static void sp_sel_trans_handle_grab(SPKnot *knot, guint state, gpointer data);
52 static void sp_sel_trans_handle_ungrab(SPKnot *knot, guint state, gpointer data);
53 static void sp_sel_trans_handle_click(SPKnot *knot, guint state, gpointer data);
54 static void sp_sel_trans_handle_new_event(SPKnot *knot, Geom::Point *position, guint32 state, gpointer data);
55 static gboolean sp_sel_trans_handle_request(SPKnot *knot, Geom::Point *p, guint state, gboolean *data);
57 extern GdkPixbuf *handles[];
59 static gboolean sp_seltrans_handle_event(SPKnot *knot, GdkEvent *event, gpointer)
60 {
61 switch (event->type) {
62 case GDK_MOTION_NOTIFY:
63 break;
64 case GDK_KEY_PRESS:
65 if (get_group0_keyval (&event->key) == GDK_space) {
66 /* stamping mode: both mode(show content and outline) operation with knot */
67 if (!SP_KNOT_IS_GRABBED(knot)) {
68 return FALSE;
69 }
70 SPDesktop *desktop = knot->desktop;
71 Inkscape::SelTrans *seltrans = SP_SELECT_CONTEXT(desktop->event_context)->_seltrans;
72 seltrans->stamp();
73 return TRUE;
74 }
75 break;
76 default:
77 break;
78 }
80 return FALSE;
81 }
83 Inkscape::SelTrans::SelTrans(SPDesktop *desktop) :
84 _desktop(desktop),
85 _selcue(desktop),
86 _state(STATE_SCALE),
87 _show(SHOW_CONTENT),
88 _grabbed(false),
89 _show_handles(true),
90 _bbox(),
91 _approximate_bbox(),
92 _absolute_affine(Geom::Scale(1,1)),
93 _opposite(Geom::Point(0,0)),
94 _opposite_for_specpoints(Geom::Point(0,0)),
95 _opposite_for_bboxpoints(Geom::Point(0,0)),
96 _origin_for_specpoints(Geom::Point(0,0)),
97 _origin_for_bboxpoints(Geom::Point(0,0)),
98 _chandle(NULL),
99 _stamp_cache(NULL),
100 _message_context(desktop->messageStack())
101 {
102 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
103 int prefs_bbox = prefs->getBool("/tools/bounding_box");
104 _snap_bbox_type = !prefs_bbox ?
105 SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
107 g_return_if_fail(desktop != NULL);
109 for (int i = 0; i < 8; i++) {
110 _shandle[i] = NULL;
111 _rhandle[i] = NULL;
112 }
114 _updateVolatileState();
115 _current_relative_affine.setIdentity();
117 _center_is_set = false; // reread _center from items, or set to bbox midpoint
119 _updateHandles();
121 _selection = sp_desktop_selection(desktop);
123 _norm = sp_canvas_item_new(sp_desktop_controls(desktop),
124 SP_TYPE_CTRL,
125 "anchor", GTK_ANCHOR_CENTER,
126 "mode", SP_CTRL_MODE_COLOR,
127 "shape", SP_CTRL_SHAPE_BITMAP,
128 "size", 13.0,
129 "filled", TRUE,
130 "fill_color", 0x00000000,
131 "stroked", TRUE,
132 "stroke_color", 0x000000a0,
133 "pixbuf", handles[12],
134 NULL);
136 _grip = sp_canvas_item_new(sp_desktop_controls(desktop),
137 SP_TYPE_CTRL,
138 "anchor", GTK_ANCHOR_CENTER,
139 "mode", SP_CTRL_MODE_XOR,
140 "shape", SP_CTRL_SHAPE_CROSS,
141 "size", 7.0,
142 "filled", TRUE,
143 "fill_color", 0xffffff7f,
144 "stroked", TRUE,
145 "stroke_color", 0xffffffff,
146 "pixbuf", handles[12],
147 NULL);
149 sp_canvas_item_hide(_grip);
150 sp_canvas_item_hide(_norm);
152 for (int i = 0; i < 4; i++) {
153 _l[i] = sp_canvas_item_new(sp_desktop_controls(desktop), SP_TYPE_CTRLLINE, NULL);
154 sp_canvas_item_hide(_l[i]);
155 }
157 _sel_changed_connection = _selection->connectChanged(
158 sigc::mem_fun(*this, &Inkscape::SelTrans::_selChanged)
159 );
161 _sel_modified_connection = _selection->connectModified(
162 sigc::mem_fun(*this, &Inkscape::SelTrans::_selModified)
163 );
164 }
166 Inkscape::SelTrans::~SelTrans()
167 {
168 _sel_changed_connection.disconnect();
169 _sel_modified_connection.disconnect();
171 for (unsigned int i = 0; i < 8; i++) {
172 if (_shandle[i]) {
173 g_object_unref(G_OBJECT(_shandle[i]));
174 _shandle[i] = NULL;
175 }
176 if (_rhandle[i]) {
177 g_object_unref(G_OBJECT(_rhandle[i]));
178 _rhandle[i] = NULL;
179 }
180 }
181 if (_chandle) {
182 g_object_unref(G_OBJECT(_chandle));
183 _chandle = NULL;
184 }
186 if (_norm) {
187 gtk_object_destroy(GTK_OBJECT(_norm));
188 _norm = NULL;
189 }
190 if (_grip) {
191 gtk_object_destroy(GTK_OBJECT(_grip));
192 _grip = NULL;
193 }
194 for (int i = 0; i < 4; i++) {
195 if (_l[i]) {
196 gtk_object_destroy(GTK_OBJECT(_l[i]));
197 _l[i] = NULL;
198 }
199 }
201 for (unsigned i = 0; i < _items.size(); i++) {
202 sp_object_unref(SP_OBJECT(_items[i]), NULL);
203 }
205 _items.clear();
206 _items_const.clear();
207 _items_affines.clear();
208 _items_centers.clear();
209 }
211 void Inkscape::SelTrans::resetState()
212 {
213 _state = STATE_SCALE;
214 }
216 void Inkscape::SelTrans::increaseState()
217 {
218 if (_state == STATE_SCALE) {
219 _state = STATE_ROTATE;
220 } else {
221 _state = STATE_SCALE;
222 }
224 _center_is_set = true; // no need to reread center
226 _updateHandles();
227 }
229 void Inkscape::SelTrans::setCenter(Geom::Point const &p)
230 {
231 _center = p;
232 _center_is_set = true;
234 // Write the new center position into all selected items
235 for (GSList const *l = _desktop->selection->itemList(); l; l = l->next) {
236 SPItem *it = (SPItem*)SP_OBJECT(l->data);
237 it->setCenter(p);
238 // only set the value; updating repr and document_done will be done once, on ungrab
239 }
241 _updateHandles();
242 }
244 void Inkscape::SelTrans::grab(Geom::Point const &p, gdouble x, gdouble y, bool show_handles, bool translating)
245 {
246 // While dragging a handle, we will either scale, skew, or rotate and the "translating" parameter will be false
247 // When dragging the selected item itself however, we will translate the selection and that parameter will be true
248 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
249 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
251 g_return_if_fail(!_grabbed);
253 _grabbed = true;
254 _show_handles = show_handles;
255 _updateVolatileState();
256 _current_relative_affine.setIdentity();
258 _changed = false;
260 if (_empty) {
261 return;
262 }
264 for (GSList const *l = selection->itemList(); l; l = l->next) {
265 SPItem *it = (SPItem *)sp_object_ref(SP_OBJECT(l->data), NULL);
266 _items.push_back(it);
267 _items_const.push_back(it);
268 _items_affines.push_back(sp_item_i2d_affine(it));
269 _items_centers.push_back(it->getCenter()); // for content-dragging, we need to remember original centers
270 }
272 _handle_x = x;
273 _handle_y = y;
275 // The selector tool should snap the bbox, special snappoints, and path nodes
276 // (The special points are the handles, center, rotation axis, font baseline, ends of spiral, etc.)
278 // First, determine the bounding box
279 _bbox = selection->bounds(_snap_bbox_type);
280 _approximate_bbox = selection->bounds(SPItem::APPROXIMATE_BBOX); // Used for correctly scaling the strokewidth
281 _geometric_bbox = selection->bounds(SPItem::GEOMETRIC_BBOX);
283 _point = p;
284 if (_geometric_bbox) {
285 _point_geom = _geometric_bbox->min() + _geometric_bbox->dimensions() * Geom::Scale(x, y);
286 } else {
287 _point_geom = p;
288 }
290 // Next, get all points to consider for snapping
291 SnapManager const &m = _desktop->namedview->snap_manager;
292 _snap_points.clear();
293 _snap_points = selection->getSnapPoints(&m.snapprefs);
294 std::vector<Inkscape::SnapCandidatePoint> snap_points_hull = selection->getSnapPointsConvexHull(&m.snapprefs);
295 if (_snap_points.size() > 200) {
296 /* Snapping a huge number of nodes will take way too long, so limit the number of snappable nodes
297 An average user would rarely ever try to snap such a large number of nodes anyway, because
298 (s)he could hardly discern which node would be snapping */
299 if (prefs->getBool("/options/snapclosestonly/value", false)) {
300 _keepClosestPointOnly(_snap_points, p);
301 } else {
302 _snap_points = snap_points_hull;
303 }
304 // Unfortunately, by now we will have lost the font-baseline snappoints :-(
305 }
307 // Find bbox hulling all special points, which excludes stroke width. Here we need to include the
308 // path nodes, for example because a rectangle which has been converted to a path doesn't have
309 // any other special points
310 Geom::Rect snap_points_bbox;
311 if ( snap_points_hull.empty() == false ) {
312 std::vector<Inkscape::SnapCandidatePoint>::iterator i = snap_points_hull.begin();
313 snap_points_bbox = Geom::Rect((*i).getPoint(), (*i).getPoint());
314 i++;
315 while (i != snap_points_hull.end()) {
316 snap_points_bbox.expandTo((*i).getPoint());
317 i++;
318 }
319 }
321 _bbox_points.clear();
322 _bbox_points_for_translating.clear();
323 // Collect the bounding box's corners and midpoints for each selected item
324 if (m.snapprefs.getSnapModeBBox()) {
325 bool mp = m.snapprefs.getSnapBBoxMidpoints();
326 bool emp = m.snapprefs.getSnapBBoxEdgeMidpoints();
327 // Preferably we'd use the bbox of each selected item, instead of the bbox of the selection as a whole; for translations
328 // this is easy to do, but when snapping the visual bbox while scaling we will have to compensate for the scaling of the
329 // stroke width. (see get_scale_transform_with_stroke()). This however is currently only implemented for a single bbox.
330 // That's why we have both _bbox_points_for_translating and _bbox_points.
331 getBBoxPoints(selection->bounds(_snap_bbox_type), &_bbox_points, false, true, emp, mp);
332 if (((_items.size() > 0) && (_items.size() < 50)) || prefs->getBool("/options/snapclosestonly/value", false)) {
333 // More than 50 items will produce at least 200 bbox points, which might make Inkscape crawl
334 // (see the comment a few lines above). In that case we will use the bbox of the selection as a whole
335 for (unsigned i = 0; i < _items.size(); i++) {
336 getBBoxPoints(sp_item_bbox_desktop(_items[i], _snap_bbox_type), &_bbox_points_for_translating, false, true, emp, mp);
337 }
338 } else {
339 _bbox_points_for_translating = _bbox_points; // use the bbox points of the selection as a whole
340 }
341 }
343 if (_bbox) {
344 // There are two separate "opposites" (i.e. opposite w.r.t. the handle being dragged):
345 // - one for snapping the boundingbox, which can be either visual or geometric
346 // - one for snapping the special points
347 // The "opposite" in case of a geometric boundingbox always coincides with the "opposite" for the special points
348 // These distinct "opposites" are needed in the snapmanager to avoid bugs such as #sf1540195 (in which
349 // a box is caught between two guides)
350 _opposite_for_bboxpoints = _bbox->min() + _bbox->dimensions() * Geom::Scale(1-x, 1-y);
351 _opposite_for_specpoints = snap_points_bbox.min() + snap_points_bbox.dimensions() * Geom::Scale(1-x, 1-y);
352 _opposite = _opposite_for_bboxpoints;
353 }
355 // When snapping the node closest to the mouse pointer is absolutely preferred over the closest snap
356 // (i.e. when weight == 1), then we will not even try to snap to other points and discard those other
357 // points immediately.
359 if (prefs->getBool("/options/snapclosestonly/value", false)) {
360 if (m.snapprefs.getSnapModeNode()) {
361 _keepClosestPointOnly(_snap_points, p);
362 } else {
363 _snap_points.clear(); // don't keep any point
364 }
366 if (m.snapprefs.getSnapModeBBox()) {
367 _keepClosestPointOnly(_bbox_points, p);
368 _keepClosestPointOnly(_bbox_points_for_translating, p);
369 } else {
370 _bbox_points.clear(); // don't keep any point
371 _bbox_points_for_translating.clear();
372 }
374 // Each of the three vectors of snappoints now contains either one snappoint or none at all.
375 if (_snap_points.size() > 1 || _bbox_points.size() > 1 || _bbox_points_for_translating.size() > 1) {
376 g_warning("Incorrect assumption encountered while finding the snap source; nothing serious, but please report to Diederik");
377 }
379 // Now let's reduce this to a single closest snappoint
380 Geom::Coord dsp = _snap_points.size() == 1 ? Geom::L2((_snap_points.at(0)).getPoint() - p) : NR_HUGE;
381 Geom::Coord dbbp = _bbox_points.size() == 1 ? Geom::L2((_bbox_points.at(0)).getPoint() - p) : NR_HUGE;
382 Geom::Coord dbbpft = _bbox_points_for_translating.size() == 1 ? Geom::L2((_bbox_points_for_translating.at(0)).getPoint() - p) : NR_HUGE;
384 if (translating) {
385 _bbox_points.clear();
386 if (dsp > dbbpft) {
387 _snap_points.clear();
388 } else {
389 _bbox_points_for_translating.clear();
390 }
391 } else {
392 _bbox_points_for_translating.clear();
393 if (dsp > dbbp) {
394 _snap_points.clear();
395 } else {
396 _bbox_points.clear();
397 }
398 }
400 if ((_snap_points.size() + _bbox_points.size() + _bbox_points_for_translating.size()) > 1) {
401 g_warning("Checking number of snap sources failed; nothing serious, but please report to Diederik");
402 }
404 // Optionally, show the snap source
405 if (!(_state == STATE_ROTATE && x != 0.5 && y != 0.5)) { // but not when we're dragging a rotation handle, because that won't snap
406 // Now either _bbox_points or _snap_points has a single element, the other one has zero..... or both have zero elements
407 if ((_snap_points.size() + _bbox_points.size() + _bbox_points_for_translating.size()) > 1) {
408 g_warning("too many snap sources to display, please fix this");
409 } else if (m.snapprefs.getSnapEnabledGlobally()) {
410 if (_bbox_points.size() == 1) {
411 _desktop->snapindicator->set_new_snapsource(_bbox_points.at(0));
412 } else if (_bbox_points_for_translating.size() == 1) {
413 _desktop->snapindicator->set_new_snapsource(_bbox_points_for_translating.at(0));
414 } else if (_snap_points.size() == 1){
415 _desktop->snapindicator->set_new_snapsource(_snap_points.at(0));
416 }
417 }
418 }
419 }
421 if ((x != -1) && (y != -1)) {
422 sp_canvas_item_show(_norm);
423 sp_canvas_item_show(_grip);
424 }
426 if (_show == SHOW_OUTLINE) {
427 for (int i = 0; i < 4; i++)
428 sp_canvas_item_show(_l[i]);
429 }
431 _updateHandles();
432 g_return_if_fail(_stamp_cache == NULL);
433 }
435 void Inkscape::SelTrans::transform(Geom::Matrix const &rel_affine, Geom::Point const &norm)
436 {
437 g_return_if_fail(_grabbed);
438 g_return_if_fail(!_empty);
440 Geom::Matrix const affine( Geom::Translate(-norm) * rel_affine * Geom::Translate(norm) );
442 if (_show == SHOW_CONTENT) {
443 // update the content
444 for (unsigned i = 0; i < _items.size(); i++) {
445 SPItem &item = *_items[i];
446 Geom::Matrix const &prev_transform = _items_affines[i];
447 sp_item_set_i2d_affine(&item, prev_transform * affine);
448 }
449 } else {
450 if (_bbox) {
451 Geom::Point p[4];
452 /* update the outline */
453 for (unsigned i = 0 ; i < 4 ; i++) {
454 p[i] = _bbox->corner(i) * affine;
455 }
456 for (unsigned i = 0 ; i < 4 ; i++) {
457 sp_ctrlline_set_coords(SP_CTRLLINE(_l[i]), p[i], p[(i+1)%4]);
458 }
459 }
460 }
462 _current_relative_affine = affine;
463 _changed = true;
464 _updateHandles();
465 }
467 void Inkscape::SelTrans::ungrab()
468 {
469 g_return_if_fail(_grabbed);
470 _grabbed = false;
471 _show_handles = true;
473 _desktop->snapindicator->remove_snapsource();
475 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
476 _updateVolatileState();
478 for (unsigned i = 0; i < _items.size(); i++) {
479 sp_object_unref(SP_OBJECT(_items[i]), NULL);
480 }
482 sp_canvas_item_hide(_norm);
483 sp_canvas_item_hide(_grip);
485 if (_show == SHOW_OUTLINE) {
486 for (int i = 0; i < 4; i++)
487 sp_canvas_item_hide(_l[i]);
488 }
490 if (_stamp_cache) {
491 g_slist_free(_stamp_cache);
492 _stamp_cache = NULL;
493 }
495 _message_context.clear();
497 if (!_empty && _changed) {
498 sp_selection_apply_affine(selection, _current_relative_affine, (_show == SHOW_OUTLINE)? true : false);
499 if (_center) {
500 *_center *= _current_relative_affine;
501 _center_is_set = true;
502 }
504 // If dragging showed content live, sp_selection_apply_affine cannot change the centers
505 // appropriately - it does not know the original positions of the centers (all objects already have
506 // the new bboxes). So we need to reset the centers from our saved array.
507 if (_show != SHOW_OUTLINE && !_current_relative_affine.isTranslation()) {
508 for (unsigned i = 0; i < _items_centers.size(); i++) {
509 SPItem *currentItem = _items[i];
510 if (currentItem->isCenterSet()) { // only if it's already set
511 currentItem->setCenter (_items_centers[i] * _current_relative_affine);
512 SP_OBJECT(currentItem)->updateRepr();
513 }
514 }
515 }
517 _items.clear();
518 _items_const.clear();
519 _items_affines.clear();
520 _items_centers.clear();
522 if (_current_relative_affine.isTranslation()) {
523 sp_document_done(sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
524 _("Move"));
525 } else if (_current_relative_affine.without_translation().isScale()) {
526 sp_document_done(sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
527 _("Scale"));
528 } else if (_current_relative_affine.without_translation().isRotation()) {
529 sp_document_done(sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
530 _("Rotate"));
531 } else {
532 sp_document_done(sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
533 _("Skew"));
534 }
536 } else {
538 if (_center_is_set) {
539 // we were dragging center; update reprs and commit undoable action
540 for (GSList const *l = _desktop->selection->itemList(); l; l = l->next) {
541 SPItem *it = (SPItem*)SP_OBJECT(l->data);
542 SP_OBJECT(it)->updateRepr();
543 }
544 sp_document_done (sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
545 _("Set center"));
546 }
548 _items.clear();
549 _items_const.clear();
550 _items_affines.clear();
551 _items_centers.clear();
552 _updateHandles();
553 }
554 }
556 /* fixme: This is really bad, as we compare positions for each stamp (Lauris) */
557 /* fixme: IMHO the best way to keep sort cache would be to implement timestamping at last */
559 void Inkscape::SelTrans::stamp()
560 {
561 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
563 bool fixup = !_grabbed;
564 if ( fixup && _stamp_cache ) {
565 // TODO - give a proper fix. Simple temproary work-around for the grab() issue
566 g_slist_free(_stamp_cache);
567 _stamp_cache = NULL;
568 }
570 /* stamping mode */
571 if (!_empty) {
572 GSList *l;
573 if (_stamp_cache) {
574 l = _stamp_cache;
575 } else {
576 /* Build cache */
577 l = g_slist_copy((GSList *) selection->itemList());
578 l = g_slist_sort(l, (GCompareFunc) sp_object_compare_position);
579 _stamp_cache = l;
580 }
582 while (l) {
583 SPItem *original_item = SP_ITEM(l->data);
584 Inkscape::XML::Node *original_repr = SP_OBJECT_REPR(original_item);
586 // remember the position of the item
587 gint pos = original_repr->position();
588 // remember parent
589 Inkscape::XML::Node *parent = sp_repr_parent(original_repr);
591 Inkscape::XML::Node *copy_repr = original_repr->duplicate(parent->document());
593 // add the new repr to the parent
594 parent->appendChild(copy_repr);
595 // move to the saved position
596 copy_repr->setPosition(pos > 0 ? pos : 0);
598 SPItem *copy_item = (SPItem *) sp_desktop_document(_desktop)->getObjectByRepr(copy_repr);
600 Geom::Matrix const *new_affine;
601 if (_show == SHOW_OUTLINE) {
602 Geom::Matrix const i2d(sp_item_i2d_affine(original_item));
603 Geom::Matrix const i2dnew( i2d * _current_relative_affine );
604 sp_item_set_i2d_affine(copy_item, i2dnew);
605 new_affine = ©_item->transform;
606 } else {
607 new_affine = &original_item->transform;
608 }
610 sp_item_write_transform(copy_item, copy_repr, *new_affine);
612 if ( copy_item->isCenterSet() && _center ) {
613 copy_item->setCenter(*_center * _current_relative_affine);
614 }
616 Inkscape::GC::release(copy_repr);
617 l = l->next;
618 }
619 sp_document_done(sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
620 _("Stamp"));
621 }
623 if ( fixup && _stamp_cache ) {
624 // TODO - give a proper fix. Simple temproary work-around for the grab() issue
625 g_slist_free(_stamp_cache);
626 _stamp_cache = NULL;
627 }
628 }
630 void Inkscape::SelTrans::_updateHandles()
631 {
632 if ( !_show_handles || _empty )
633 {
634 sp_remove_handles(_shandle, 8);
635 sp_remove_handles(_rhandle, 8);
636 sp_remove_handles(&_chandle, 1);
637 return;
638 }
640 // center handle
641 if ( _chandle == NULL ) {
642 _chandle = sp_knot_new(_desktop, _("<b>Center</b> of rotation and skewing: drag to reposition; scaling with Shift also uses this center"));
644 _chandle->setShape (SP_CTRL_SHAPE_BITMAP);
645 _chandle->setSize (13);
646 _chandle->setAnchor (handle_center.anchor);
647 _chandle->setMode (SP_CTRL_MODE_XOR);
648 _chandle->setFill(0x00000000, 0x00000000, 0x00000000);
649 _chandle->setStroke(0x000000ff, 0xff0000b0, 0xff0000b0);
650 _chandle->setPixbuf(handles[handle_center.control]);
651 sp_knot_update_ctrl(_chandle);
653 g_signal_connect(G_OBJECT(_chandle), "request",
654 G_CALLBACK(sp_sel_trans_handle_request), (gpointer) &handle_center);
655 g_signal_connect(G_OBJECT(_chandle), "moved",
656 G_CALLBACK(sp_sel_trans_handle_new_event), (gpointer) &handle_center);
657 g_signal_connect(G_OBJECT(_chandle), "grabbed",
658 G_CALLBACK(sp_sel_trans_handle_grab), (gpointer) &handle_center);
659 g_signal_connect(G_OBJECT(_chandle), "ungrabbed",
660 G_CALLBACK(sp_sel_trans_handle_ungrab), (gpointer) &handle_center);
661 g_signal_connect(G_OBJECT(_chandle), "clicked",
662 G_CALLBACK(sp_sel_trans_handle_click), (gpointer) &handle_center);
663 }
665 sp_remove_handles(&_chandle, 1);
666 if ( _state == STATE_SCALE ) {
667 sp_remove_handles(_rhandle, 8);
668 _showHandles(_shandle, handles_scale, 8,
669 _("<b>Squeeze or stretch</b> selection; with <b>Ctrl</b> to scale uniformly; with <b>Shift</b> to scale around rotation center"),
670 _("<b>Scale</b> selection; with <b>Ctrl</b> to scale uniformly; with <b>Shift</b> to scale around rotation center"));
671 } else {
672 sp_remove_handles(_shandle, 8);
673 _showHandles(_rhandle, handles_rotate, 8,
674 _("<b>Skew</b> selection; with <b>Ctrl</b> to snap angle; with <b>Shift</b> to skew around the opposite side"),
675 _("<b>Rotate</b> selection; with <b>Ctrl</b> to snap angle; with <b>Shift</b> to rotate around the opposite corner"));
676 }
678 if (!_center_is_set) {
679 _center = _desktop->selection->center();
680 _center_is_set = true;
681 }
683 if ( _state == STATE_SCALE || !_center ) {
684 sp_knot_hide(_chandle);
685 } else {
686 sp_knot_show(_chandle);
687 sp_knot_moveto(_chandle, *_center);
688 }
689 }
691 void Inkscape::SelTrans::_updateVolatileState()
692 {
693 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
694 _empty = selection->isEmpty();
696 if (_empty) {
697 return;
698 }
700 //Update the bboxes
701 _bbox = selection->bounds(_snap_bbox_type);
702 _approximate_bbox = selection->bounds(SPItem::APPROXIMATE_BBOX);
704 if (!_bbox) {
705 _empty = true;
706 return;
707 }
709 _strokewidth = stroke_average_width (selection->itemList());
710 }
712 static void sp_remove_handles(SPKnot *knot[], gint num)
713 {
714 for (int i = 0; i < num; i++) {
715 if (knot[i] != NULL) {
716 sp_knot_hide(knot[i]);
717 }
718 }
719 }
721 void Inkscape::SelTrans::_showHandles(SPKnot *knot[], SPSelTransHandle const handle[], gint num,
722 gchar const *even_tip, gchar const *odd_tip)
723 {
724 g_return_if_fail( !_empty );
726 for (int i = 0; i < num; i++) {
727 if (knot[i] == NULL) {
728 knot[i] = sp_knot_new(_desktop, i % 2 ? even_tip : odd_tip);
730 knot[i]->setShape (SP_CTRL_SHAPE_BITMAP);
731 knot[i]->setSize (13);
732 knot[i]->setAnchor (handle[i].anchor);
733 knot[i]->setMode (SP_CTRL_MODE_XOR);
734 knot[i]->setFill(0x000000ff, 0x00ff6600, 0x00ff6600); // inversion, green, green
735 knot[i]->setStroke(0x000000ff, 0x000000ff, 0x000000ff); // inversion
736 knot[i]->setPixbuf(handles[handle[i].control]);
737 sp_knot_update_ctrl(knot[i]);
739 g_signal_connect(G_OBJECT(knot[i]), "request",
740 G_CALLBACK(sp_sel_trans_handle_request), (gpointer) &handle[i]);
741 g_signal_connect(G_OBJECT(knot[i]), "moved",
742 G_CALLBACK(sp_sel_trans_handle_new_event), (gpointer) &handle[i]);
743 g_signal_connect(G_OBJECT(knot[i]), "grabbed",
744 G_CALLBACK(sp_sel_trans_handle_grab), (gpointer) &handle[i]);
745 g_signal_connect(G_OBJECT(knot[i]), "ungrabbed",
746 G_CALLBACK(sp_sel_trans_handle_ungrab), (gpointer) &handle[i]);
747 g_signal_connect(G_OBJECT(knot[i]), "event", G_CALLBACK(sp_seltrans_handle_event), (gpointer) &handle[i]);
748 }
749 sp_knot_show(knot[i]);
751 Geom::Point const handle_pt(handle[i].x, handle[i].y);
752 // shouldn't have nullary bbox, but knots
753 g_assert(_bbox);
754 Geom::Point p( _bbox->min()
755 + ( _bbox->dimensions()
756 * Geom::Scale(handle_pt) ) );
758 sp_knot_moveto(knot[i], p);
759 }
760 }
762 static void sp_sel_trans_handle_grab(SPKnot *knot, guint state, gpointer data)
763 {
764 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleGrab(
765 knot, state, *(SPSelTransHandle const *) data
766 );
767 }
769 static void sp_sel_trans_handle_ungrab(SPKnot *knot, guint /*state*/, gpointer /*data*/)
770 {
771 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->ungrab();
772 }
774 static void sp_sel_trans_handle_new_event(SPKnot *knot, Geom::Point *position, guint state, gpointer data)
775 {
776 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleNewEvent(
777 knot, position, state, *(SPSelTransHandle const *) data
778 );
779 }
781 static gboolean sp_sel_trans_handle_request(SPKnot *knot, Geom::Point *position, guint state, gboolean *data)
782 {
783 return SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleRequest(
784 knot, position, state, *(SPSelTransHandle const *) data
785 );
786 }
788 static void sp_sel_trans_handle_click(SPKnot *knot, guint state, gpointer data)
789 {
790 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleClick(
791 knot, state, *(SPSelTransHandle const *) data
792 );
793 }
795 void Inkscape::SelTrans::handleClick(SPKnot */*knot*/, guint state, SPSelTransHandle const &handle)
796 {
797 switch (handle.anchor) {
798 case GTK_ANCHOR_CENTER:
799 if (state & GDK_SHIFT_MASK) {
800 // Unset the center position for all selected items
801 for (GSList const *l = _desktop->selection->itemList(); l; l = l->next) {
802 SPItem *it = (SPItem*)(SP_OBJECT(l->data));
803 it->unsetCenter();
804 SP_OBJECT(it)->updateRepr();
805 _center_is_set = false; // center has changed
806 _updateHandles();
807 }
808 sp_document_done (sp_desktop_document(_desktop), SP_VERB_CONTEXT_SELECT,
809 _("Reset center"));
810 }
811 break;
812 default:
813 break;
814 }
815 }
817 void Inkscape::SelTrans::handleGrab(SPKnot *knot, guint /*state*/, SPSelTransHandle const &handle)
818 {
819 switch (handle.anchor) {
820 case GTK_ANCHOR_CENTER:
821 g_object_set(G_OBJECT(_grip),
822 "shape", SP_CTRL_SHAPE_BITMAP,
823 "size", 13.0,
824 NULL);
825 sp_canvas_item_show(_grip);
826 break;
827 default:
828 g_object_set(G_OBJECT(_grip),
829 "shape", SP_CTRL_SHAPE_CROSS,
830 "size", 7.0,
831 NULL);
832 sp_canvas_item_show(_norm);
833 sp_canvas_item_show(_grip);
835 break;
836 }
838 grab(sp_knot_position(knot), handle.x, handle.y, FALSE, FALSE);
839 }
842 void Inkscape::SelTrans::handleNewEvent(SPKnot *knot, Geom::Point *position, guint state, SPSelTransHandle const &handle)
843 {
844 if (!SP_KNOT_IS_GRABBED(knot)) {
845 return;
846 }
848 // in case items have been unhooked from the document, don't
849 // try to continue processing events for them.
850 for (unsigned int i = 0; i < _items.size(); i++) {
851 if (!SP_OBJECT_DOCUMENT(SP_OBJECT(_items[i])) ) {
852 return;
853 }
854 }
856 handle.action(this, handle, *position, state);
857 }
860 gboolean Inkscape::SelTrans::handleRequest(SPKnot *knot, Geom::Point *position, guint state, SPSelTransHandle const &handle)
861 {
862 if (!SP_KNOT_IS_GRABBED(knot)) {
863 return TRUE;
864 }
866 knot->desktop->setPosition(*position);
868 // When holding shift while rotating or skewing, the transformation will be
869 // relative to the point opposite of the handle; otherwise it will be relative
870 // to the center as set for the selection
871 if ((!(state & GDK_SHIFT_MASK) == !(_state == STATE_ROTATE)) && (&handle != &handle_center)) {
872 _origin = _opposite;
873 _origin_for_bboxpoints = _opposite_for_bboxpoints;
874 _origin_for_specpoints = _opposite_for_specpoints;
875 } else if (_center) {
876 _origin = *_center;
877 _origin_for_bboxpoints = *_center;
878 _origin_for_specpoints = *_center;
879 } else {
880 // FIXME
881 return TRUE;
882 }
883 if (handle.request(this, handle, *position, state)) {
884 sp_knot_set_position(knot, *position, state);
885 SP_CTRL(_grip)->moveto(*position);
886 if (&handle == &handle_center) {
887 SP_CTRL(_norm)->moveto(*position);
888 } else {
889 SP_CTRL(_norm)->moveto(_origin);
890 }
891 }
893 return TRUE;
894 }
897 void Inkscape::SelTrans::_selChanged(Inkscape::Selection */*selection*/)
898 {
899 if (!_grabbed) {
900 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
901 // reread in case it changed on the fly:
902 int prefs_bbox = prefs->getBool("/tools/bounding_box");
903 _snap_bbox_type = !prefs_bbox ?
904 SPItem::APPROXIMATE_BBOX : SPItem::GEOMETRIC_BBOX;
905 //SPItem::APPROXIMATE_BBOX will be replaced by SPItem::VISUAL_BBOX, as soon as the latter is implemented properly
907 _updateVolatileState();
908 _current_relative_affine.setIdentity();
909 _center_is_set = false; // center(s) may have changed
910 _updateHandles();
911 }
912 }
914 void Inkscape::SelTrans::_selModified(Inkscape::Selection */*selection*/, guint /*flags*/)
915 {
916 if (!_grabbed) {
917 _updateVolatileState();
918 _current_relative_affine.setIdentity();
920 // reset internal flag
921 _changed = false;
923 _center_is_set = false; // center(s) may have changed
925 _updateHandles();
926 }
927 }
929 /*
930 * handlers for handle move-request
931 */
933 /** Returns -1 or 1 according to the sign of x. Returns 1 for 0 and NaN. */
934 static double sign(double const x)
935 {
936 return ( x < 0
937 ? -1
938 : 1 );
939 }
941 gboolean sp_sel_trans_scale_request(Inkscape::SelTrans *seltrans,
942 SPSelTransHandle const &, Geom::Point &pt, guint state)
943 {
944 return seltrans->scaleRequest(pt, state);
945 }
947 gboolean sp_sel_trans_stretch_request(Inkscape::SelTrans *seltrans,
948 SPSelTransHandle const &handle, Geom::Point &pt, guint state)
949 {
950 return seltrans->stretchRequest(handle, pt, state);
951 }
953 gboolean sp_sel_trans_skew_request(Inkscape::SelTrans *seltrans,
954 SPSelTransHandle const &handle, Geom::Point &pt, guint state)
955 {
956 return seltrans->skewRequest(handle, pt, state);
957 }
959 gboolean sp_sel_trans_rotate_request(Inkscape::SelTrans *seltrans,
960 SPSelTransHandle const &, Geom::Point &pt, guint state)
961 {
962 return seltrans->rotateRequest(pt, state);
963 }
965 gboolean sp_sel_trans_center_request(Inkscape::SelTrans *seltrans,
966 SPSelTransHandle const &, Geom::Point &pt, guint state)
967 {
968 return seltrans->centerRequest(pt, state);
969 }
971 gboolean Inkscape::SelTrans::scaleRequest(Geom::Point &pt, guint state)
972 {
974 // Calculate the scale factors, which can be either visual or geometric
975 // depending on which type of bbox is currently being used (see preferences -> selector tool)
976 Geom::Scale default_scale = calcScaleFactors(_point, pt, _origin);
978 // Find the scale factors for the geometric bbox
979 Geom::Point pt_geom = _getGeomHandlePos(pt);
980 Geom::Scale geom_scale = calcScaleFactors(_point_geom, pt_geom, _origin_for_specpoints);
982 _absolute_affine = Geom::identity(); //Initialize the scaler
984 if (state & GDK_MOD1_MASK) { // scale by an integer multiplier/divider
985 // We're scaling either the visual or the geometric bbox here (see the comment above)
986 for ( unsigned int i = 0 ; i < 2 ; i++ ) {
987 if (fabs(default_scale[i]) > 1) {
988 default_scale[i] = round(default_scale[i]);
989 } else if (default_scale[i] != 0) {
990 default_scale[i] = 1/round(1/(MIN(default_scale[i], 10)));
991 }
992 }
993 // Update the knot position
994 pt = _calcAbsAffineDefault(default_scale);
995 // When scaling by an integer, snapping is not needed
996 } else {
997 // In all other cases we should try to snap now
998 SnapManager &m = _desktop->namedview->snap_manager;
999 m.setup(_desktop, false, _items_const);
1001 Inkscape::SnappedPoint bb, sn;
1003 if ((state & GDK_CONTROL_MASK) || _desktop->isToolboxButtonActive ("lock")) {
1004 // Scale is locked to a 1:1 aspect ratio, so that s[X] must be made to equal s[Y].
1005 //
1006 // The aspect-ratio must be locked before snapping
1007 if (fabs(default_scale[Geom::X]) > fabs(default_scale[Geom::Y])) {
1008 default_scale[Geom::X] = fabs(default_scale[Geom::Y]) * sign(default_scale[Geom::X]);
1009 geom_scale[Geom::X] = fabs(geom_scale[Geom::Y]) * sign(geom_scale[Geom::X]);
1010 } else {
1011 default_scale[Geom::Y] = fabs(default_scale[Geom::X]) * sign(default_scale[Geom::Y]);
1012 geom_scale[Geom::Y] = fabs(geom_scale[Geom::X]) * sign(geom_scale[Geom::Y]);
1013 }
1015 // Snap along a suitable constraint vector from the origin.
1016 bb = m.constrainedSnapScale(_bbox_points, _point, default_scale, _origin_for_bboxpoints);
1017 sn = m.constrainedSnapScale(_snap_points, _point, geom_scale, _origin_for_specpoints);
1018 } else {
1019 /* Scale aspect ratio is unlocked */
1020 bb = m.freeSnapScale(_bbox_points, _point, default_scale, _origin_for_bboxpoints);
1021 sn = m.freeSnapScale(_snap_points, _point, geom_scale, _origin_for_specpoints);
1022 }
1024 if (!(bb.getSnapped() || sn.getSnapped())) {
1025 // We didn't snap at all! Don't update the handle position, just calculate the new transformation
1026 _calcAbsAffineDefault(default_scale);
1027 _desktop->snapindicator->remove_snaptarget();
1028 } else if (bb.getSnapped() && !bb.isOtherSnapBetter(sn, false)) {
1029 // We snapped the bbox (which is either visual or geometric)
1030 _desktop->snapindicator->set_new_snaptarget(bb);
1031 default_scale = Geom::Scale(bb.getTransformation());
1032 // Calculate the new transformation and update the handle position
1033 pt = _calcAbsAffineDefault(default_scale);
1034 } else {
1035 _desktop->snapindicator->set_new_snaptarget(sn);
1036 // We snapped the special points (e.g. nodes), which are not at the visual bbox
1037 // The handle location however (pt) might however be at the visual bbox, so we
1038 // will have to calculate pt taking the stroke width into account
1039 geom_scale = Geom::Scale(sn.getTransformation());
1040 pt = _calcAbsAffineGeom(geom_scale);
1041 }
1042 m.unSetup();
1043 }
1045 /* Status text */
1046 _message_context.setF(Inkscape::IMMEDIATE_MESSAGE,
1047 _("<b>Scale</b>: %0.2f%% x %0.2f%%; with <b>Ctrl</b> to lock ratio"),
1048 100 * _absolute_affine[0], 100 * _absolute_affine[3]);
1050 return TRUE;
1051 }
1053 gboolean Inkscape::SelTrans::stretchRequest(SPSelTransHandle const &handle, Geom::Point &pt, guint state)
1054 {
1055 Geom::Dim2 axis, perp;
1056 switch (handle.cursor) {
1057 case GDK_TOP_SIDE:
1058 case GDK_BOTTOM_SIDE:
1059 axis = Geom::Y;
1060 perp = Geom::X;
1061 break;
1062 case GDK_LEFT_SIDE:
1063 case GDK_RIGHT_SIDE:
1064 axis = Geom::X;
1065 perp = Geom::Y;
1066 break;
1067 default:
1068 g_assert_not_reached();
1069 return TRUE;
1070 };
1072 // Calculate the scale factors, which can be either visual or geometric
1073 // depending on which type of bbox is currently being used (see preferences -> selector tool)
1074 Geom::Scale default_scale = calcScaleFactors(_point, pt, _origin);
1075 default_scale[perp] = 1;
1077 // Find the scale factors for the geometric bbox
1078 Geom::Point pt_geom = _getGeomHandlePos(pt);
1079 Geom::Scale geom_scale = calcScaleFactors(_point_geom, pt_geom, _origin_for_specpoints);
1080 geom_scale[perp] = 1;
1082 _absolute_affine = Geom::identity(); //Initialize the scaler
1084 if (state & GDK_MOD1_MASK) { // stretch by an integer multiplier/divider
1085 if (fabs(default_scale[axis]) > 1) {
1086 default_scale[axis] = round(default_scale[axis]);
1087 } else if (default_scale[axis] != 0) {
1088 default_scale[axis] = 1/round(1/(MIN(default_scale[axis], 10)));
1089 }
1090 // Calculate the new transformation and update the handle position
1091 pt = _calcAbsAffineDefault(default_scale);
1092 // When stretching by an integer, snapping is not needed
1093 } else {
1094 // In all other cases we should try to snap now
1096 SnapManager &m = _desktop->namedview->snap_manager;
1097 m.setup(_desktop, false, _items_const);
1099 Inkscape::SnappedPoint bb, sn;
1100 g_assert(bb.getSnapped() == false); // Check initialization to catch any regression
1102 bool symmetrical = state & GDK_CONTROL_MASK;
1104 bb = m.constrainedSnapStretch(_bbox_points, _point, Geom::Coord(default_scale[axis]), _origin_for_bboxpoints, Geom::Dim2(axis), symmetrical);
1105 sn = m.constrainedSnapStretch(_snap_points, _point, Geom::Coord(geom_scale[axis]), _origin_for_specpoints, Geom::Dim2(axis), symmetrical);
1107 if (bb.getSnapped()) {
1108 // We snapped the bbox (which is either visual or geometric)
1109 default_scale[axis] = bb.getTransformation()[axis];
1110 }
1112 if (sn.getSnapped()) {
1113 geom_scale[axis] = sn.getTransformation()[axis];
1114 }
1116 if (symmetrical) {
1117 // on ctrl, apply symmetrical scaling instead of stretching
1118 // Preserve aspect ratio, but never flip in the dimension not being edited (by using fabs())
1119 default_scale[perp] = fabs(default_scale[axis]);
1120 geom_scale[perp] = fabs(geom_scale[axis]);
1121 }
1123 if (!(bb.getSnapped() || sn.getSnapped())) {
1124 // We didn't snap at all! Don't update the handle position, just calculate the new transformation
1125 _calcAbsAffineDefault(default_scale);
1126 _desktop->snapindicator->remove_snaptarget();
1127 } else if (bb.getSnapped() && !bb.isOtherSnapBetter(sn, false)) {
1128 _desktop->snapindicator->set_new_snaptarget(bb);
1129 // Calculate the new transformation and update the handle position
1130 pt = _calcAbsAffineDefault(default_scale);
1131 } else {
1132 _desktop->snapindicator->set_new_snaptarget(sn);
1133 // We snapped the special points (e.g. nodes), which are not at the visual bbox
1134 // The handle location however (pt) might however be at the visual bbox, so we
1135 // will have to calculate pt taking the stroke width into account
1136 pt = _calcAbsAffineGeom(geom_scale);
1137 }
1139 m.unSetup();
1140 }
1142 // status text
1143 _message_context.setF(Inkscape::IMMEDIATE_MESSAGE,
1144 _("<b>Scale</b>: %0.2f%% x %0.2f%%; with <b>Ctrl</b> to lock ratio"),
1145 100 * _absolute_affine[0], 100 * _absolute_affine[3]);
1147 return TRUE;
1148 }
1150 gboolean Inkscape::SelTrans::skewRequest(SPSelTransHandle const &handle, Geom::Point &pt, guint state)
1151 {
1152 /* When skewing (or rotating):
1153 * 1) the stroke width will not change. This makes life much easier because we don't have to
1154 * account for that (like for scaling or stretching). As a consequence, all points will
1155 * have the same origin for the transformation and for the snapping.
1156 * 2) When holding shift, the transformation will be relative to the point opposite of
1157 * the handle; otherwise it will be relative to the center as set for the selection
1158 */
1160 Geom::Dim2 dim_a;
1161 Geom::Dim2 dim_b;
1163 switch (handle.cursor) {
1164 case GDK_SB_H_DOUBLE_ARROW:
1165 dim_a = Geom::Y;
1166 dim_b = Geom::X;
1167 break;
1168 case GDK_SB_V_DOUBLE_ARROW:
1169 dim_a = Geom::X;
1170 dim_b = Geom::Y;
1171 break;
1172 default:
1173 g_assert_not_reached();
1174 abort();
1175 break;
1176 }
1178 Geom::Point const initial_delta = _point - _origin;
1180 if (fabs(initial_delta[dim_a]) < 1e-15) {
1181 return false;
1182 }
1184 // Calculate the scale factors, which can be either visual or geometric
1185 // depending on which type of bbox is currently being used (see preferences -> selector tool)
1186 Geom::Scale scale = calcScaleFactors(_point, pt, _origin, false);
1187 Geom::Scale skew = calcScaleFactors(_point, pt, _origin, true);
1188 scale[dim_b] = 1;
1189 skew[dim_b] = 1;
1191 if (fabs(scale[dim_a]) < 1) {
1192 // Prevent shrinking of the selected object, while allowing mirroring
1193 scale[dim_a] = sign(scale[dim_a]);
1194 } else {
1195 // Allow expanding of the selected object by integer multiples
1196 scale[dim_a] = floor(scale[dim_a] + 0.5);
1197 }
1199 double radians = atan(skew[dim_a] / scale[dim_a]);
1201 if (state & GDK_CONTROL_MASK) {
1202 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1203 // Snap to defined angle increments
1204 int snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
1205 if (snaps) {
1206 double sections = floor(radians * snaps / M_PI + .5);
1207 if (fabs(sections) >= snaps / 2) {
1208 sections = sign(sections) * (snaps / 2 - 1);
1209 }
1210 radians = (M_PI / snaps) * sections;
1211 }
1212 skew[dim_a] = tan(radians) * scale[dim_a];
1213 } else {
1214 // Snap to objects, grids, guides
1216 SnapManager &m = _desktop->namedview->snap_manager;
1217 m.setup(_desktop, false, _items_const);
1219 Inkscape::Snapper::SnapConstraint const constraint(component_vectors[dim_b]);
1220 // When skewing, we cannot snap the corners of the bounding box, see the comment in "constrainedSnapSkew" for details
1221 Geom::Point const s(skew[dim_a], scale[dim_a]);
1222 Inkscape::SnappedPoint sn = m.constrainedSnapSkew(_snap_points, _point, constraint, s, _origin, Geom::Dim2(dim_b));
1224 if (sn.getSnapped()) {
1225 // We snapped something, so change the skew to reflect it
1226 Geom::Coord const sd = sn.getSnapped() ? sn.getTransformation()[0] : NR_HUGE;
1227 _desktop->snapindicator->set_new_snaptarget(sn);
1228 skew[dim_a] = sd;
1229 } else {
1230 _desktop->snapindicator->remove_snaptarget();
1231 }
1233 m.unSetup();
1234 }
1236 // Update the handle position
1237 pt[dim_b] = initial_delta[dim_a] * skew[dim_a] + _point[dim_b];
1238 pt[dim_a] = initial_delta[dim_a] * scale[dim_a] + _origin[dim_a];
1240 // Calculate the relative affine
1241 _relative_affine = Geom::identity();
1242 _relative_affine[2*dim_a + dim_a] = (pt[dim_a] - _origin[dim_a]) / initial_delta[dim_a];
1243 _relative_affine[2*dim_a + (dim_b)] = (pt[dim_b] - _point[dim_b]) / initial_delta[dim_a];
1244 _relative_affine[2*(dim_b) + (dim_a)] = 0;
1245 _relative_affine[2*(dim_b) + (dim_b)] = 1;
1247 for (int i = 0; i < 2; i++) {
1248 if (fabs(_relative_affine[3*i]) < 1e-15) {
1249 _relative_affine[3*i] = 1e-15;
1250 }
1251 }
1253 // Update the status text
1254 double degrees = mod360symm(Geom::rad_to_deg(radians));
1255 _message_context.setF(Inkscape::IMMEDIATE_MESSAGE,
1256 // TRANSLATORS: don't modify the first ";"
1257 // (it will NOT be displayed as ";" - only the second one will be)
1258 _("<b>Skew</b>: %0.2f°; with <b>Ctrl</b> to snap angle"),
1259 degrees);
1261 return TRUE;
1262 }
1264 gboolean Inkscape::SelTrans::rotateRequest(Geom::Point &pt, guint state)
1265 {
1266 /* When rotating (or skewing):
1267 * 1) the stroke width will not change. This makes life much easier because we don't have to
1268 * account for that (like for scaling or stretching). As a consequence, all points will
1269 * have the same origin for the transformation and for the snapping.
1270 * 2) When holding shift, the transformation will be relative to the point opposite of
1271 * the handle; otherwise it will be relative to the center as set for the selection
1272 */
1274 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1275 int snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
1277 // rotate affine in rotate
1278 Geom::Point const d1 = _point - _origin;
1279 Geom::Point const d2 = pt - _origin;
1281 Geom::Coord const h1 = Geom::L2(d1); // initial radius
1282 if (h1 < 1e-15) return FALSE;
1283 Geom::Point q1 = d1 / h1; // normalized initial vector to handle
1284 Geom::Coord const h2 = Geom::L2(d2); // new radius
1285 if (fabs(h2) < 1e-15) return FALSE;
1286 Geom::Point q2 = d2 / h2; // normalized new vector to handle
1288 Geom::Rotate r1(q1);
1289 Geom::Rotate r2(q2);
1291 double radians = atan2(Geom::dot(Geom::rot90(d1), d2), Geom::dot(d1, d2));;
1292 if (state & GDK_CONTROL_MASK) {
1293 // Snap to defined angle increments
1294 double cos_t = Geom::dot(q1, q2);
1295 double sin_t = Geom::dot(Geom::rot90(q1), q2);
1296 radians = atan2(sin_t, cos_t);
1297 if (snaps) {
1298 radians = ( M_PI / snaps ) * floor( radians * snaps / M_PI + .5 );
1299 }
1300 r1 = Geom::Rotate(0); //q1 = Geom::Point(1, 0);
1301 r2 = Geom::Rotate(radians); //q2 = Geom::Point(cos(radians), sin(radians));
1302 } else {
1303 SnapManager &m = _desktop->namedview->snap_manager;
1304 m.setup(_desktop, false, _items_const);
1305 // When rotating, we cannot snap the corners of the bounding box, see the comment in "constrainedSnapRotate" for details
1306 Inkscape::SnappedPoint sn = m.constrainedSnapRotate(_snap_points, _point, radians, _origin);
1307 m.unSetup();
1309 if (sn.getSnapped()) {
1310 _desktop->snapindicator->set_new_snaptarget(sn);
1311 // We snapped something, so change the rotation to reflect it
1312 radians = sn.getTransformation()[0];
1313 r1 = Geom::Rotate(0);
1314 r2 = Geom::Rotate(radians);
1315 } else {
1316 _desktop->snapindicator->remove_snaptarget();
1317 }
1319 }
1322 // Calculate the relative affine
1323 _relative_affine = r2 * r1.inverse();
1325 // Update the handle position
1326 pt = _point * Geom::Translate(-_origin) * _relative_affine * Geom::Translate(_origin);
1328 // Update the status text
1329 double degrees = mod360symm(Geom::rad_to_deg(radians));
1330 _message_context.setF(Inkscape::IMMEDIATE_MESSAGE,
1331 // TRANSLATORS: don't modify the first ";"
1332 // (it will NOT be displayed as ";" - only the second one will be)
1333 _("<b>Rotate</b>: %0.2f°; with <b>Ctrl</b> to snap angle"), degrees);
1335 return TRUE;
1336 }
1338 // Move the item's transformation center
1339 gboolean Inkscape::SelTrans::centerRequest(Geom::Point &pt, guint state)
1340 {
1341 // Center is being dragged for the first item in the selection only
1342 // Find out which item is first ...
1343 GSList *items = (GSList *) const_cast<Selection *>(_selection)->itemList();
1344 SPItem *first = NULL;
1345 if (items) {
1346 first = reinterpret_cast<SPItem*>(g_slist_last(items)->data); // from the first item in selection
1347 }
1348 // ... and store that item because later on we need to make sure that
1349 // this transformation center won't snap to itself
1350 SnapManager &m = _desktop->namedview->snap_manager;
1351 m.setup(_desktop);
1352 m.setRotationCenterSource(first);
1353 m.freeSnapReturnByRef(pt, Inkscape::SNAPSOURCE_ROTATION_CENTER);
1354 m.unSetup();
1356 if (state & GDK_CONTROL_MASK) {
1357 if ( fabs(_point[Geom::X] - pt[Geom::X]) > fabs(_point[Geom::Y] - pt[Geom::Y]) ) {
1358 pt[Geom::Y] = _point[Geom::Y];
1359 } else {
1360 pt[Geom::X] = _point[Geom::X];
1361 }
1362 }
1364 // status text
1365 GString *xs = SP_PX_TO_METRIC_STRING(pt[Geom::X], _desktop->namedview->getDefaultMetric());
1366 GString *ys = SP_PX_TO_METRIC_STRING(pt[Geom::Y], _desktop->namedview->getDefaultMetric());
1367 _message_context.setF(Inkscape::NORMAL_MESSAGE, _("Move <b>center</b> to %s, %s"), xs->str, ys->str);
1368 g_string_free(xs, FALSE);
1369 g_string_free(ys, FALSE);
1371 return TRUE;
1372 }
1374 /*
1375 * handlers for handle movement
1376 *
1377 */
1379 void sp_sel_trans_stretch(Inkscape::SelTrans *seltrans, SPSelTransHandle const &handle, Geom::Point &pt, guint state)
1380 {
1381 seltrans->stretch(handle, pt, state);
1382 }
1384 void sp_sel_trans_scale(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, Geom::Point &pt, guint state)
1385 {
1386 seltrans->scale(pt, state);
1387 }
1389 void sp_sel_trans_skew(Inkscape::SelTrans *seltrans, SPSelTransHandle const &handle, Geom::Point &pt, guint state)
1390 {
1391 seltrans->skew(handle, pt, state);
1392 }
1394 void sp_sel_trans_rotate(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, Geom::Point &pt, guint state)
1395 {
1396 seltrans->rotate(pt, state);
1397 }
1399 void Inkscape::SelTrans::stretch(SPSelTransHandle const &/*handle*/, Geom::Point &/*pt*/, guint /*state*/)
1400 {
1401 transform(_absolute_affine, Geom::Point(0, 0)); // we have already accounted for origin, so pass 0,0
1402 }
1404 void Inkscape::SelTrans::scale(Geom::Point &/*pt*/, guint /*state*/)
1405 {
1406 transform(_absolute_affine, Geom::Point(0, 0)); // we have already accounted for origin, so pass 0,0
1407 }
1409 void Inkscape::SelTrans::skew(SPSelTransHandle const &/*handle*/, Geom::Point &/*pt*/, guint /*state*/)
1410 {
1411 transform(_relative_affine, _origin);
1412 }
1414 void Inkscape::SelTrans::rotate(Geom::Point &/*pt*/, guint /*state*/)
1415 {
1416 transform(_relative_affine, _origin);
1417 }
1419 void sp_sel_trans_center(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, Geom::Point &pt, guint /*state*/)
1420 {
1421 seltrans->setCenter(pt);
1422 }
1425 void Inkscape::SelTrans::moveTo(Geom::Point const &xy, guint state)
1426 {
1427 SnapManager &m = _desktop->namedview->snap_manager;
1429 /* The amount that we've moved by during this drag */
1430 Geom::Point dxy = xy - _point;
1432 bool const alt = (state & GDK_MOD1_MASK);
1433 bool const control = (state & GDK_CONTROL_MASK);
1434 bool const shift = (state & GDK_SHIFT_MASK);
1436 if (alt) {
1438 // Alt pressed means: move only by integer multiples of the grid spacing
1440 if (control) { // ... if also constrained to the orthogonal axes
1441 if (fabs(dxy[Geom::X]) > fabs(dxy[Geom::Y])) {
1442 dxy[Geom::Y] = 0;
1443 } else {
1444 dxy[Geom::X] = 0;
1445 }
1446 }
1447 m.setup(_desktop, true, _items_const);
1448 dxy = m.multipleOfGridPitch(dxy, _point);
1449 m.unSetup();
1450 } else if (shift) {
1451 if (control) { // shift & control: constrained movement without snapping
1452 if (fabs(dxy[Geom::X]) > fabs(dxy[Geom::Y])) {
1453 dxy[Geom::Y] = 0;
1454 } else {
1455 dxy[Geom::X] = 0;
1456 }
1457 }
1458 } else { //!shift: with snapping
1460 /* We're snapping to things, possibly with a constraint to horizontal or
1461 ** vertical movement. Obtain a list of possible translations and then
1462 ** pick the smallest.
1463 */
1465 m.setup(_desktop, false, _items_const);
1467 /* This will be our list of possible translations */
1468 std::list<Inkscape::SnappedPoint> s;
1470 if (control) { // constrained movement with snapping
1472 /* Snap to things, and also constrain to horizontal or vertical movement */
1474 unsigned int dim = fabs(dxy[Geom::X]) > fabs(dxy[Geom::Y]) ? Geom::X : Geom::Y;
1475 // When doing a constrained translation, all points will move in the same direction, i.e.
1476 // either horizontally or vertically. Therefore we only have to specify the direction of
1477 // the constraint-line once. The constraint lines are parallel, but might not be colinear.
1478 // Therefore we will have to set the point through which the constraint-line runs
1479 // individually for each point to be snapped; this will be handled however by _snapTransformed()
1480 s.push_back(m.constrainedSnapTranslate(_bbox_points_for_translating,
1481 _point,
1482 Inkscape::Snapper::SnapConstraint(component_vectors[dim]),
1483 dxy));
1485 s.push_back(m.constrainedSnapTranslate(_snap_points,
1486 _point,
1487 Inkscape::Snapper::SnapConstraint(component_vectors[dim]),
1488 dxy));
1489 } else { // !control
1491 // Let's leave this timer code here for a while. I'll probably need it in the near future (Diederik van Lierop)
1492 /* GTimeVal starttime;
1493 GTimeVal endtime;
1494 g_get_current_time(&starttime); */
1496 /* Snap to things with no constraint */
1497 s.push_back(m.freeSnapTranslate(_bbox_points_for_translating, _point, dxy));
1498 s.push_back(m.freeSnapTranslate(_snap_points, _point, dxy));
1500 /*g_get_current_time(&endtime);
1501 double elapsed = ((((double)endtime.tv_sec - starttime.tv_sec) * G_USEC_PER_SEC + (endtime.tv_usec - starttime.tv_usec))) / 1000.0;
1502 std::cout << "Time spent snapping: " << elapsed << std::endl; */
1503 }
1504 m.unSetup();
1506 /* Pick one */
1507 Inkscape::SnappedPoint best_snapped_point;
1508 for (std::list<Inkscape::SnappedPoint>::const_iterator i = s.begin(); i != s.end(); i++) {
1509 if (i->getSnapped()) {
1510 if (best_snapped_point.isOtherSnapBetter(*i, true)) {
1511 best_snapped_point = *i;
1512 dxy = i->getTransformation();
1513 }
1514 }
1515 }
1517 if (best_snapped_point.getSnapped()) {
1518 _desktop->snapindicator->set_new_snaptarget(best_snapped_point);
1519 } else {
1520 // We didn't snap, so remove any previous snap indicator
1521 _desktop->snapindicator->remove_snaptarget();
1522 if (control) {
1523 // If we didn't snap, then we should still constrain horizontally or vertically
1524 // (When we did snap, then this constraint has already been enforced by
1525 // calling constrainedSnapTranslate() above)
1526 if (fabs(dxy[Geom::X]) > fabs(dxy[Geom::Y])) {
1527 dxy[Geom::Y] = 0;
1528 } else {
1529 dxy[Geom::X] = 0;
1530 }
1531 }
1532 }
1533 }
1535 Geom::Matrix const move((Geom::Translate(dxy)));
1536 Geom::Point const norm(0, 0);
1537 transform(move, norm);
1539 // status text
1540 GString *xs = SP_PX_TO_METRIC_STRING(dxy[Geom::X], _desktop->namedview->getDefaultMetric());
1541 GString *ys = SP_PX_TO_METRIC_STRING(dxy[Geom::Y], _desktop->namedview->getDefaultMetric());
1542 _message_context.setF(Inkscape::NORMAL_MESSAGE, _("<b>Move</b> by %s, %s; with <b>Ctrl</b> to restrict to horizontal/vertical; with <b>Shift</b> to disable snapping"), xs->str, ys->str);
1543 g_string_free(xs, TRUE);
1544 g_string_free(ys, TRUE);
1545 }
1547 // Given a location of a handle at the visual bounding box, find the corresponding location at the
1548 // geometrical bounding box
1549 Geom::Point Inkscape::SelTrans::_getGeomHandlePos(Geom::Point const &visual_handle_pos)
1550 {
1551 if ( _snap_bbox_type == SPItem::GEOMETRIC_BBOX) {
1552 // When the selector tool is using geometric bboxes, then the handle is already
1553 // located at one of the geometric bbox corners
1554 return visual_handle_pos;
1555 }
1557 if (!_geometric_bbox) {
1558 //_getGeomHandlePos() can only be used after _geometric_bbox has been defined!
1559 return visual_handle_pos;
1560 }
1562 // Using the Geom::Rect constructor below ensures that "min() < max()", which is important
1563 // because this will also hold for _bbox, and which is required for get_scale_transform_with_stroke()
1564 Geom::Rect new_bbox = Geom::Rect(_origin_for_bboxpoints, visual_handle_pos); // new visual bounding box
1565 // Please note that the new_bbox might in fact be just a single line, for example when stretching (in
1566 // which case the handle and origin will be aligned vertically or horizontally)
1567 Geom::Point normalized_handle_pos = (visual_handle_pos - new_bbox.min()) * Geom::Scale(new_bbox.dimensions()).inverse();
1569 // Calculate the absolute affine while taking into account the scaling of the stroke width
1570 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1571 bool transform_stroke = prefs->getBool("/options/transform/stroke", true);
1572 Geom::Matrix abs_affine = get_scale_transform_with_stroke (*_bbox, _strokewidth, transform_stroke,
1573 new_bbox.min()[Geom::X], new_bbox.min()[Geom::Y], new_bbox.max()[Geom::X], new_bbox.max()[Geom::Y]);
1575 // Calculate the scaled geometrical bbox
1576 Geom::Rect new_geom_bbox = Geom::Rect(_geometric_bbox->min() * abs_affine, _geometric_bbox->max() * abs_affine);
1577 // Find the location of the handle on this new geometrical bbox
1578 return normalized_handle_pos * Geom::Scale(new_geom_bbox.dimensions()) + new_geom_bbox.min(); //new position of the geometric handle
1579 }
1581 Geom::Scale Inkscape::calcScaleFactors(Geom::Point const &initial_point, Geom::Point const &new_point, Geom::Point const &origin, bool const skew)
1582 {
1583 // Work out the new scale factors for the bbox
1585 Geom::Point const initial_delta = initial_point - origin;
1586 Geom::Point const new_delta = new_point - origin;
1587 Geom::Point const offset = new_point - initial_point;
1588 Geom::Scale scale(1, 1);
1590 for ( unsigned int i = 0 ; i < 2 ; i++ ) {
1591 if ( fabs(initial_delta[i]) > 1e-6 ) {
1592 if (skew) {
1593 scale[i] = offset[1-i] / initial_delta[i];
1594 } else {
1595 scale[i] = new_delta[i] / initial_delta[i];
1596 }
1597 }
1598 }
1600 return scale;
1601 }
1603 // Only for scaling/stretching
1604 Geom::Point Inkscape::SelTrans::_calcAbsAffineDefault(Geom::Scale const default_scale)
1605 {
1606 Geom::Matrix abs_affine = Geom::Translate(-_origin) * Geom::Matrix(default_scale) * Geom::Translate(_origin);
1607 Geom::Point new_bbox_min = _approximate_bbox->min() * abs_affine;
1608 Geom::Point new_bbox_max = _approximate_bbox->max() * abs_affine;
1610 bool transform_stroke = false;
1611 gdouble strokewidth = 0;
1613 if ( _snap_bbox_type != SPItem::GEOMETRIC_BBOX) {
1614 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1615 transform_stroke = prefs->getBool("/options/transform/stroke", true);
1616 strokewidth = _strokewidth;
1617 }
1619 _absolute_affine = get_scale_transform_with_stroke (*_approximate_bbox, strokewidth, transform_stroke,
1620 new_bbox_min[Geom::X], new_bbox_min[Geom::Y], new_bbox_max[Geom::X], new_bbox_max[Geom::Y]);
1622 // return the new handle position
1623 return ( _point - _origin ) * default_scale + _origin;
1624 }
1626 // Only for scaling/stretching
1627 Geom::Point Inkscape::SelTrans::_calcAbsAffineGeom(Geom::Scale const geom_scale)
1628 {
1629 _relative_affine = Geom::Matrix(geom_scale);
1630 _absolute_affine = Geom::Translate(-_origin_for_specpoints) * _relative_affine * Geom::Translate(_origin_for_specpoints);
1632 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1633 bool const transform_stroke = prefs->getBool("/options/transform/stroke", true);
1634 if (_geometric_bbox) {
1635 Geom::Rect visual_bbox = get_visual_bbox(_geometric_bbox, _absolute_affine, _strokewidth, transform_stroke);
1636 // return the new handle position
1637 return visual_bbox.min() + visual_bbox.dimensions() * Geom::Scale(_handle_x, _handle_y);
1638 }
1640 // Fall back scenario, in case we don't have a geometric bounding box at hand;
1641 // (Due to some bugs related to bounding boxes having at least one zero dimension; For more details
1642 // see https://bugs.launchpad.net/inkscape/+bug/318726)
1643 g_warning("No geometric bounding box has been calculated; this is a bug that needs fixing!");
1644 return _calcAbsAffineDefault(geom_scale); // this is bogus, but we must return _something_
1645 }
1647 void Inkscape::SelTrans::_keepClosestPointOnly(std::vector<Inkscape::SnapCandidatePoint> &points, const Geom::Point &reference)
1648 {
1649 if (points.size() < 2) return;
1651 Inkscape::SnapCandidatePoint closest_point = Inkscape::SnapCandidatePoint(Geom::Point(NR_HUGE, NR_HUGE), SNAPSOURCE_UNDEFINED, SNAPTARGET_UNDEFINED);
1652 Geom::Coord closest_dist = NR_HUGE;
1654 for(std::vector<Inkscape::SnapCandidatePoint>::const_iterator i = points.begin(); i != points.end(); i++) {
1655 Geom::Coord dist = Geom::L2((*i).getPoint() - reference);
1656 if (i == points.begin() || dist < closest_dist) {
1657 closest_point = *i;
1658 closest_dist = dist;
1659 }
1660 }
1662 points.clear();
1663 points.push_back(closest_point);
1664 }
1666 /*
1667 Local Variables:
1668 mode:c++
1669 c-file-style:"stroustrup"
1670 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1671 indent-tabs-mode:nil
1672 fill-column:99
1673 End:
1674 */
1675 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :