1 #define __SELTRANS_C__
3 /*
4 * Helper object for transforming selected items
5 *
6 * Author:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 * Carl Hetherington <inkscape@carlh.net>
10 *
11 * Copyright (C) 1999-2002 Lauris Kaplinski
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
20 #include <libnr/nr-matrix-ops.h>
21 #include <libnr/nr-matrix-translate-ops.h>
22 #include <libnr/nr-rotate-ops.h>
23 #include <libnr/nr-scale-ops.h>
24 #include <libnr/nr-translate-matrix-ops.h>
25 #include <libnr/nr-translate-ops.h>
26 #include <gdk/gdkkeysyms.h>
27 #include "document.h"
28 #include "sp-namedview.h"
29 #include "desktop.h"
30 #include "desktop-handles.h"
31 #include "desktop-style.h"
32 #include "knot.h"
33 #include "snap.h"
34 #include "selection.h"
35 #include "select-context.h"
36 #include "sp-item.h"
37 #include "sp-item-transform.h"
38 #include "seltrans-handles.h"
39 #include "seltrans.h"
40 #include "selection-chemistry.h"
41 #include "sp-metrics.h"
42 #include <glibmm/i18n.h>
43 #include "display/sp-ctrlline.h"
44 #include "prefs-utils.h"
45 #include "xml/repr.h"
47 #include "isnan.h" //temp fix. make sure included last
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, NR::Point *position, guint32 state, gpointer data);
55 static gboolean sp_sel_trans_handle_request(SPKnot *knot, NR::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 _box(NR::Point(0,0), NR::Point(0,0)),
91 _chandle(NULL),
92 _stamp_cache(NULL),
93 _message_context(desktop->messageStack())
94 {
95 g_return_if_fail(desktop != NULL);
97 for (int i = 0; i < 8; i++) {
98 _shandle[i] = NULL;
99 _rhandle[i] = NULL;
100 }
102 _updateVolatileState();
104 _center_is_set = false; // reread _center from items, or set to bbox midpoint
106 _updateHandles();
108 _selection = sp_desktop_selection(desktop);
110 _norm = sp_canvas_item_new(sp_desktop_controls(desktop),
111 SP_TYPE_CTRL,
112 "anchor", GTK_ANCHOR_CENTER,
113 "mode", SP_CTRL_MODE_COLOR,
114 "shape", SP_CTRL_SHAPE_BITMAP,
115 "size", 13.0,
116 "filled", TRUE,
117 "fill_color", 0x00000000,
118 "stroked", TRUE,
119 "stroke_color", 0x000000a0,
120 "pixbuf", handles[12],
121 NULL);
123 _grip = sp_canvas_item_new(sp_desktop_controls(desktop),
124 SP_TYPE_CTRL,
125 "anchor", GTK_ANCHOR_CENTER,
126 "mode", SP_CTRL_MODE_XOR,
127 "shape", SP_CTRL_SHAPE_CROSS,
128 "size", 7.0,
129 "filled", TRUE,
130 "fill_color", 0xffffff7f,
131 "stroked", TRUE,
132 "stroke_color", 0xffffffff,
133 "pixbuf", handles[12],
134 NULL);
136 sp_canvas_item_hide(_grip);
137 sp_canvas_item_hide(_norm);
139 for (int i = 0; i < 4; i++) {
140 _l[i] = sp_canvas_item_new(sp_desktop_controls(desktop), SP_TYPE_CTRLLINE, NULL);
141 sp_canvas_item_hide(_l[i]);
142 }
144 _sel_changed_connection = _selection->connectChanged(
145 sigc::mem_fun(*this, &Inkscape::SelTrans::_selChanged)
146 );
148 _sel_modified_connection = _selection->connectModified(
149 sigc::mem_fun(*this, &Inkscape::SelTrans::_selModified)
150 );
151 }
153 Inkscape::SelTrans::~SelTrans()
154 {
155 _sel_changed_connection.disconnect();
156 _sel_modified_connection.disconnect();
158 for (unsigned int i = 0; i < 8; i++) {
159 if (_shandle[i]) {
160 g_object_unref(G_OBJECT(_shandle[i]));
161 _shandle[i] = NULL;
162 }
163 if (_rhandle[i]) {
164 g_object_unref(G_OBJECT(_rhandle[i]));
165 _rhandle[i] = NULL;
166 }
167 }
168 if (_chandle) {
169 g_object_unref(G_OBJECT(_chandle));
170 _chandle = NULL;
171 }
173 if (_norm) {
174 gtk_object_destroy(GTK_OBJECT(_norm));
175 _norm = NULL;
176 }
177 if (_grip) {
178 gtk_object_destroy(GTK_OBJECT(_grip));
179 _grip = NULL;
180 }
181 for (int i = 0; i < 4; i++) {
182 if (_l[i]) {
183 gtk_object_destroy(GTK_OBJECT(_l[i]));
184 _l[i] = NULL;
185 }
186 }
188 for (unsigned i = 0; i < _items.size(); i++) {
189 sp_object_unref(SP_OBJECT(_items[i].first), NULL);
190 }
192 _items.clear();
193 _items_centers.clear();
194 }
196 void Inkscape::SelTrans::resetState()
197 {
198 _state = STATE_SCALE;
199 }
201 void Inkscape::SelTrans::increaseState()
202 {
203 if (_state == STATE_SCALE) {
204 _state = STATE_ROTATE;
205 } else {
206 _state = STATE_SCALE;
207 }
209 _center_is_set = true; // no need to reread center
211 _updateHandles();
212 }
214 void Inkscape::SelTrans::setCenter(NR::Point const &p)
215 {
216 _center = p;
217 _center_is_set = true;
219 // Write the new center position into all selected items
220 for (GSList const *l = _desktop->selection->itemList(); l; l = l->next) {
221 SPItem *it = (SPItem*)sp_object_ref(SP_OBJECT(l->data), NULL);
222 it->setCenter(p);
223 SP_OBJECT(it)->updateRepr();
224 }
225 sp_document_maybe_done (sp_desktop_document(_desktop), "center::move");
227 _updateHandles();
228 }
230 void Inkscape::SelTrans::grab(NR::Point const &p, gdouble x, gdouble y, bool show_handles)
231 {
232 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
234 g_return_if_fail(!_grabbed);
236 _grabbed = true;
237 _show_handles = show_handles;
238 _updateVolatileState();
240 _changed = false;
242 if (_empty) {
243 return;
244 }
246 for (GSList const *l = selection->itemList(); l; l = l->next) {
247 SPItem *it = (SPItem*)sp_object_ref(SP_OBJECT(l->data), NULL);
248 _items.push_back(std::pair<SPItem *, NR::Matrix>(it, sp_item_i2d_affine(it)));
249 _items_centers.push_back(std::pair<SPItem *, NR::Point>(it, it->getCenter())); // for content-dragging, we need to remember original centers
250 }
252 _current.set_identity();
254 _point = p;
256 _snap_points = selection->getSnapPointsConvexHull();
257 _bbox_points = selection->getBBoxPointsOuter();
259 gchar const *scale_origin = prefs_get_string_attribute("tools.select", "scale_origin");
260 bool const origin_on_bbox = (scale_origin == NULL || !strcmp(scale_origin, "bbox"));
261 NR::Rect op_box = _box;
262 if (origin_on_bbox == false && _snap_points.empty() == false) {
263 std::vector<NR::Point>::iterator i = _snap_points.begin();
264 op_box = NR::Rect(*i, *i);
265 i++;
266 while (i != _snap_points.end()) {
267 op_box.expandTo(*i);
268 i++;
269 }
270 }
272 _opposite = ( op_box.min() + ( op_box.dimensions() * NR::scale(1-x, 1-y) ) );
274 if ((x != -1) && (y != -1)) {
275 sp_canvas_item_show(_norm);
276 sp_canvas_item_show(_grip);
277 }
279 if (_show == SHOW_OUTLINE) {
280 for (int i = 0; i < 4; i++)
281 sp_canvas_item_show(_l[i]);
282 }
285 _updateHandles();
286 g_return_if_fail(_stamp_cache == NULL);
287 }
289 void Inkscape::SelTrans::transform(NR::Matrix const &rel_affine, NR::Point const &norm)
290 {
291 g_return_if_fail(_grabbed);
292 g_return_if_fail(!_empty);
294 NR::Matrix const affine( NR::translate(-norm) * rel_affine * NR::translate(norm) );
296 if (_show == SHOW_CONTENT) {
297 // update the content
298 for (unsigned i = 0; i < _items.size(); i++) {
299 SPItem &item = *_items[i].first;
300 NR::Matrix const &prev_transform = _items[i].second;
301 sp_item_set_i2d_affine(&item, prev_transform * affine);
302 }
303 } else {
304 NR::Point p[4];
305 /* update the outline */
306 for (unsigned i = 0 ; i < 4 ; i++) {
307 p[i] = _box.corner(i) * affine;
308 }
309 for (unsigned i = 0 ; i < 4 ; i++) {
310 sp_ctrlline_set_coords(SP_CTRLLINE(_l[i]), p[i], p[(i+1)%4]);
311 }
312 }
314 _current = affine;
315 _changed = true;
316 _updateHandles();
317 }
319 void Inkscape::SelTrans::ungrab()
320 {
321 g_return_if_fail(_grabbed);
323 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
324 bool updh = true;
325 if (!_empty && _changed) {
326 sp_selection_apply_affine(selection, _current, (_show == SHOW_OUTLINE)? true : false);
327 _center *= _current;
328 _center_is_set = true;
330 // If dragging showed content live, sp_selection_apply_affine cannot change the centers
331 // appropriately - it does not know the original positions of the centers (all objects already have
332 // the new bboxes). So we need to reset the centers from our saved array.
333 if (_show != SHOW_OUTLINE && !_current.is_translation()) {
334 for (unsigned i = 0; i < _items_centers.size(); i++) {
335 SPItem *currentItem = _items_centers[i].first;
336 if (currentItem->isCenterSet()) { // only if it's already set
337 currentItem->setCenter (_items_centers[i].second * _current);
338 SP_OBJECT(currentItem)->updateRepr();
339 }
340 }
341 }
343 sp_document_done(sp_desktop_document(_desktop));
344 updh = false;
345 }
347 for (unsigned i = 0; i < _items.size(); i++) {
348 sp_object_unref(SP_OBJECT(_items[i].first), NULL);
349 }
350 _items.clear();
351 _items_centers.clear();
353 _grabbed = false;
354 _show_handles = true;
356 sp_canvas_item_hide(_norm);
357 sp_canvas_item_hide(_grip);
359 if (_show == SHOW_OUTLINE) {
360 for (int i = 0; i < 4; i++)
361 sp_canvas_item_hide(_l[i]);
362 }
364 _updateVolatileState();
365 if (updh) {
366 _updateHandles();
367 }
368 if (_stamp_cache) {
369 g_slist_free(_stamp_cache);
370 _stamp_cache = NULL;
371 }
373 _message_context.clear();
374 }
376 /* fixme: This is really bad, as we compare positions for each stamp (Lauris) */
377 /* fixme: IMHO the best way to keep sort cache would be to implement timestamping at last */
379 void Inkscape::SelTrans::stamp()
380 {
381 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
383 bool fixup = !_grabbed;
384 if ( fixup && _stamp_cache ) {
385 // TODO - give a proper fix. Simple temproary work-around for the grab() issue
386 g_slist_free(_stamp_cache);
387 _stamp_cache = NULL;
388 }
390 /* stamping mode */
391 if (!_empty) {
392 GSList *l;
393 if (_stamp_cache) {
394 l = _stamp_cache;
395 } else {
396 /* Build cache */
397 l = g_slist_copy((GSList *) selection->itemList());
398 l = g_slist_sort(l, (GCompareFunc) sp_object_compare_position);
399 _stamp_cache = l;
400 }
402 while (l) {
403 SPItem *original_item = SP_ITEM(l->data);
404 Inkscape::XML::Node *original_repr = SP_OBJECT_REPR(original_item);
406 // remember the position of the item
407 gint pos = original_repr->position();
408 // remember parent
409 Inkscape::XML::Node *parent = sp_repr_parent(original_repr);
411 Inkscape::XML::Node *copy_repr = original_repr->duplicate();
413 // add the new repr to the parent
414 parent->appendChild(copy_repr);
415 // move to the saved position
416 copy_repr->setPosition(pos > 0 ? pos : 0);
418 SPItem *copy_item = (SPItem *) sp_desktop_document(_desktop)->getObjectByRepr(copy_repr);
420 NR::Matrix const *new_affine;
421 if (_show == SHOW_OUTLINE) {
422 NR::Matrix const i2d(sp_item_i2d_affine(original_item));
423 NR::Matrix const i2dnew( i2d * _current );
424 sp_item_set_i2d_affine(copy_item, i2dnew);
425 new_affine = ©_item->transform;
426 } else {
427 new_affine = &original_item->transform;
428 }
430 sp_item_write_transform(copy_item, copy_repr, *new_affine);
432 if (copy_item->isCenterSet()) {
433 copy_item->setCenter(_center * _current);
434 }
436 Inkscape::GC::release(copy_repr);
437 l = l->next;
438 }
439 sp_document_done(sp_desktop_document(_desktop));
440 }
442 if ( fixup && _stamp_cache ) {
443 // TODO - give a proper fix. Simple temproary work-around for the grab() issue
444 g_slist_free(_stamp_cache);
445 _stamp_cache = NULL;
446 }
447 }
449 void Inkscape::SelTrans::_updateHandles()
450 {
451 if ( !_show_handles || _empty )
452 {
453 sp_remove_handles(_shandle, 8);
454 sp_remove_handles(_rhandle, 8);
455 sp_remove_handles(&_chandle, 1);
456 return;
457 }
459 // center handle
460 if ( _chandle == NULL ) {
461 _chandle = sp_knot_new(_desktop, _("<b>Center</b> of rotation and skewing: drag to reposition; scaling with Shift also uses this center"));
463 _chandle->setShape (SP_CTRL_SHAPE_BITMAP);
464 _chandle->setSize (13);
465 _chandle->setAnchor (handle_center.anchor);
466 _chandle->setMode (SP_CTRL_MODE_XOR);
467 _chandle->setFill(0x00000000, 0x00000000, 0x00000000);
468 _chandle->setStroke(0x000000ff, 0xff0000b0, 0xff0000b0);
469 _chandle->setPixbuf(handles[handle_center.control]);
470 sp_knot_update_ctrl(_chandle);
472 g_signal_connect(G_OBJECT(_chandle), "request",
473 G_CALLBACK(sp_sel_trans_handle_request), (gpointer) &handle_center);
474 g_signal_connect(G_OBJECT(_chandle), "moved",
475 G_CALLBACK(sp_sel_trans_handle_new_event), (gpointer) &handle_center);
476 g_signal_connect(G_OBJECT(_chandle), "grabbed",
477 G_CALLBACK(sp_sel_trans_handle_grab), (gpointer) &handle_center);
478 g_signal_connect(G_OBJECT(_chandle), "ungrabbed",
479 G_CALLBACK(sp_sel_trans_handle_ungrab), (gpointer) &handle_center);
480 g_signal_connect(G_OBJECT(_chandle), "clicked",
481 G_CALLBACK(sp_sel_trans_handle_click), (gpointer) &handle_center);
482 }
484 sp_remove_handles(&_chandle, 1);
485 if ( _state == STATE_SCALE ) {
486 sp_remove_handles(_rhandle, 8);
487 _showHandles(_shandle, handles_scale, 8,
488 _("<b>Squeeze or stretch</b> selection; with <b>Ctrl</b> to scale uniformly; with <b>Shift</b> to scale around rotation center"),
489 _("<b>Scale</b> selection; with <b>Ctrl</b> to scale uniformly; with <b>Shift</b> to scale around rotation center"));
490 } else {
491 sp_remove_handles(_shandle, 8);
492 _showHandles(_rhandle, handles_rotate, 8,
493 _("<b>Skew</b> selection; with <b>Ctrl</b> to snap angle; with <b>Shift</b> to skew around the opposite side"),
494 _("<b>Rotate</b> selection; with <b>Ctrl</b> to snap angle; with <b>Shift</b> to rotate around the opposite corner"));
495 }
497 if (!_center_is_set) {
498 _center = _desktop->selection->center();
499 _center_is_set = true;
500 }
502 if ( _state == STATE_SCALE ) {
503 sp_knot_hide(_chandle);
504 } else {
505 sp_knot_show(_chandle);
506 sp_knot_moveto(_chandle, &_center);
507 }
508 }
510 void Inkscape::SelTrans::_updateVolatileState()
511 {
512 Inkscape::Selection *selection = sp_desktop_selection(_desktop);
513 _empty = selection->isEmpty();
515 if (_empty) {
516 return;
517 }
519 _box = selection->bounds();
520 if (_box.isEmpty()) {
521 _empty = true;
522 return;
523 }
525 _strokewidth = stroke_average_width (selection->itemList());
527 _current.set_identity();
528 }
530 static void sp_remove_handles(SPKnot *knot[], gint num)
531 {
532 for (int i = 0; i < num; i++) {
533 if (knot[i] != NULL) {
534 sp_knot_hide(knot[i]);
535 }
536 }
537 }
539 void Inkscape::SelTrans::_showHandles(SPKnot *knot[], SPSelTransHandle const handle[], gint num,
540 gchar const *even_tip, gchar const *odd_tip)
541 {
542 g_return_if_fail( !_empty );
544 for (int i = 0; i < num; i++) {
545 if (knot[i] == NULL) {
546 knot[i] = sp_knot_new(_desktop, i % 2 ? even_tip : odd_tip);
548 knot[i]->setShape (SP_CTRL_SHAPE_BITMAP);
549 knot[i]->setSize (13);
550 knot[i]->setAnchor (handle[i].anchor);
551 knot[i]->setMode (SP_CTRL_MODE_XOR);
552 knot[i]->setFill(0x000000ff, 0x00ff6600, 0x00ff6600); // inversion, green, green
553 knot[i]->setStroke(0x000000ff, 0x000000ff, 0x000000ff); // inversion
554 knot[i]->setPixbuf(handles[handle[i].control]);
555 sp_knot_update_ctrl(knot[i]);
557 g_signal_connect(G_OBJECT(knot[i]), "request",
558 G_CALLBACK(sp_sel_trans_handle_request), (gpointer) &handle[i]);
559 g_signal_connect(G_OBJECT(knot[i]), "moved",
560 G_CALLBACK(sp_sel_trans_handle_new_event), (gpointer) &handle[i]);
561 g_signal_connect(G_OBJECT(knot[i]), "grabbed",
562 G_CALLBACK(sp_sel_trans_handle_grab), (gpointer) &handle[i]);
563 g_signal_connect(G_OBJECT(knot[i]), "ungrabbed",
564 G_CALLBACK(sp_sel_trans_handle_ungrab), (gpointer) &handle[i]);
565 g_signal_connect(G_OBJECT(knot[i]), "event", G_CALLBACK(sp_seltrans_handle_event), (gpointer) &handle[i]);
566 }
567 sp_knot_show(knot[i]);
569 NR::Point const handle_pt(handle[i].x, handle[i].y);
570 NR::Point p( _box.min()
571 + ( _box.dimensions()
572 * NR::scale(handle_pt) ) );
574 sp_knot_moveto(knot[i], &p);
575 }
576 }
578 static void sp_sel_trans_handle_grab(SPKnot *knot, guint state, gpointer data)
579 {
580 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleGrab(
581 knot, state, *(SPSelTransHandle const *) data
582 );
583 }
585 static void sp_sel_trans_handle_ungrab(SPKnot *knot, guint state, gpointer data)
586 {
587 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->ungrab();
588 }
590 static void sp_sel_trans_handle_new_event(SPKnot *knot, NR::Point *position, guint state, gpointer data)
591 {
592 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleNewEvent(
593 knot, position, state, *(SPSelTransHandle const *) data
594 );
595 }
597 static gboolean sp_sel_trans_handle_request(SPKnot *knot, NR::Point *position, guint state, gboolean *data)
598 {
599 return SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleRequest(
600 knot, position, state, *(SPSelTransHandle const *) data
601 );
602 }
604 static void sp_sel_trans_handle_click(SPKnot *knot, guint state, gpointer data)
605 {
606 SP_SELECT_CONTEXT(knot->desktop->event_context)->_seltrans->handleClick(
607 knot, state, *(SPSelTransHandle const *) data
608 );
609 }
611 void Inkscape::SelTrans::handleClick(SPKnot *knot, guint state, SPSelTransHandle const &handle)
612 {
613 switch (handle.anchor) {
614 case GTK_ANCHOR_CENTER:
615 if (state & GDK_SHIFT_MASK) {
616 // Unset the center position for all selected items
617 for (GSList const *l = _desktop->selection->itemList(); l; l = l->next) {
618 SPItem *it = (SPItem*)sp_object_ref(SP_OBJECT(l->data), NULL);
619 it->unsetCenter();
620 SP_OBJECT(it)->updateRepr();
621 _center_is_set = false; // center has changed
622 _updateHandles();
623 }
624 sp_document_maybe_done (sp_desktop_document(_desktop), "center::unset");
625 }
626 break;
627 default:
628 break;
629 }
630 }
632 void Inkscape::SelTrans::handleGrab(SPKnot *knot, guint state, SPSelTransHandle const &handle)
633 {
634 switch (handle.anchor) {
635 case GTK_ANCHOR_CENTER:
636 g_object_set(G_OBJECT(_grip),
637 "shape", SP_CTRL_SHAPE_BITMAP,
638 "size", 13.0,
639 NULL);
640 sp_canvas_item_show(_grip);
641 break;
642 default:
643 g_object_set(G_OBJECT(_grip),
644 "shape", SP_CTRL_SHAPE_CROSS,
645 "size", 7.0,
646 NULL);
647 sp_canvas_item_show(_norm);
648 sp_canvas_item_show(_grip);
650 break;
651 }
653 grab(sp_knot_position(knot), handle.x, handle.y, FALSE);
654 }
657 void Inkscape::SelTrans::handleNewEvent(SPKnot *knot, NR::Point *position, guint state, SPSelTransHandle const &handle)
658 {
659 if (!SP_KNOT_IS_GRABBED(knot)) {
660 return;
661 }
663 // in case items have been unhooked from the document, don't
664 // try to continue processing events for them.
665 for (unsigned int i = 0; i < _items.size(); i++) {
666 if (!SP_OBJECT_DOCUMENT(SP_OBJECT(_items[i].first)) ) {
667 return;
668 }
669 }
671 handle.action(this, handle, *position, state);
672 }
675 gboolean Inkscape::SelTrans::handleRequest(SPKnot *knot, NR::Point *position, guint state, SPSelTransHandle const &handle)
676 {
677 if (!SP_KNOT_IS_GRABBED(knot)) {
678 return TRUE;
679 }
681 knot->desktop->set_coordinate_status(*position);
682 knot->desktop->setPosition(*position);
685 if (state & GDK_MOD1_MASK) {
686 *position = _point + ( *position - _point ) / 10;
687 }
689 if (!(state & GDK_SHIFT_MASK) == !(_state == STATE_ROTATE)) {
690 _origin = _opposite;
691 } else {
692 _origin = _center;
693 }
694 if (handle.request(this, handle, *position, state)) {
695 sp_knot_set_position(knot, position, state);
696 SP_CTRL(_grip)->moveto(*position);
697 SP_CTRL(_norm)->moveto(_origin);
698 }
700 return TRUE;
701 }
704 void Inkscape::SelTrans::_selChanged(Inkscape::Selection *selection)
705 {
706 if (!_grabbed) {
707 _updateVolatileState();
708 _center_is_set = false; // center(s) may have changed
709 _updateHandles();
710 }
711 }
713 void Inkscape::SelTrans::_selModified(Inkscape::Selection *selection, guint flags)
714 {
715 if (!_grabbed) {
716 _updateVolatileState();
718 // reset internal flag
719 _changed = false;
721 _center_is_set = false; // center(s) may have changed
723 _updateHandles();
724 }
725 }
727 /*
728 * handlers for handle move-request
729 */
731 /** Returns -1 or 1 according to the sign of x. Returns 1 for 0 and NaN. */
732 static double sign(double const x)
733 {
734 return ( x < 0
735 ? -1
736 : 1 );
737 }
739 gboolean sp_sel_trans_scale_request(Inkscape::SelTrans *seltrans,
740 SPSelTransHandle const &, NR::Point &pt, guint state)
741 {
742 return seltrans->scaleRequest(pt, state);
743 }
745 gboolean sp_sel_trans_stretch_request(Inkscape::SelTrans *seltrans,
746 SPSelTransHandle const &handle, NR::Point &pt, guint state)
747 {
748 return seltrans->stretchRequest(handle, pt, state);
749 }
751 gboolean sp_sel_trans_skew_request(Inkscape::SelTrans *seltrans,
752 SPSelTransHandle const &handle, NR::Point &pt, guint state)
753 {
754 return seltrans->skewRequest(handle, pt, state);
755 }
757 gboolean sp_sel_trans_rotate_request(Inkscape::SelTrans *seltrans,
758 SPSelTransHandle const &, NR::Point &pt, guint state)
759 {
760 return seltrans->rotateRequest(pt, state);
761 }
763 gboolean sp_sel_trans_center_request(Inkscape::SelTrans *seltrans,
764 SPSelTransHandle const &, NR::Point &pt, guint state)
765 {
766 return seltrans->centerRequest(pt, state);
767 }
769 gboolean Inkscape::SelTrans::scaleRequest(NR::Point &pt, guint state)
770 {
771 using NR::X;
772 using NR::Y;
774 NR::Point d = _point - _origin;
775 NR::scale s(0, 0);
777 /* Work out the new scale factors `s' */
778 for ( unsigned int i = 0 ; i < 2 ; i++ ) {
779 if ( fabs(d[i]) > 0.001 ) {
780 s[i] = ( pt[i] - _origin[i] ) / d[i];
781 if ( fabs(s[i]) < 1e-9 ) {
782 s[i] = 1e-9;
783 }
784 }
785 }
787 SnapManager const &m = _desktop->namedview->snap_manager;
789 /* Get a STL list of the selected items.
790 ** FIXME: this should probably be done by Inkscape::Selection.
791 */
792 std::list<SPItem const*> it;
793 for (GSList const *i = _selection->itemList(); i != NULL; i = i->next) {
794 it.push_back(reinterpret_cast<SPItem*>(i->data));
795 }
797 if ((state & GDK_CONTROL_MASK) || _desktop->isToolboxButtonActive ("lock")) {
798 /* Scale is locked to a 1:1 aspect ratio, so that s[X] must be made to equal s[Y].
799 ** To do this, we snap along a suitable constraint vector from the origin.
800 */
802 NR::Point const cv = NR::Point(
803 pt[NR::X] > _origin[NR::X] ? 1 : -1,
804 pt[NR::Y] > _origin[NR::Y] ? 1 : -1
805 );
807 std::pair<NR::scale, bool> bb = m.constrainedSnapScale(Snapper::BBOX_POINT,
808 _bbox_points,
809 it,
810 Snapper::ConstraintLine(_origin, cv),
811 s,
812 _origin);
814 std::pair<NR::scale, bool> sn = m.constrainedSnapScale(Snapper::SNAP_POINT,
815 _snap_points,
816 it,
817 Snapper::ConstraintLine(_origin, cv),
818 s,
819 _origin);
821 if (bb.second == false && sn.second == false) {
823 /* We didn't snap, so just lock aspect ratio */
824 if (fabs(s[NR::X]) > fabs(s[NR::Y])) {
825 s[NR::X] = fabs(s[NR::Y]) * sign(s[NR::X]);
826 } else {
827 s[NR::Y] = fabs(s[NR::X]) * sign(s[NR::Y]);
828 }
830 } else {
832 /* Choose the smaller difference in scale. Since s[X] == s[Y] we can
833 ** just compare difference in s[X].
834 */
835 double const bd = bb.second ? fabs(bb.first[NR::X] - s[NR::X]) : NR_HUGE;
836 double const sd = sn.second ? fabs(sn.first[NR::X] - s[NR::X]) : NR_HUGE;
837 s = (bd < sd) ? bb.first : sn.first;
838 }
840 } else {
841 /* Scale aspect ratio is unlocked */
843 std::pair<NR::scale, bool> bb = m.freeSnapScale(Snapper::BBOX_POINT,
844 _bbox_points,
845 it,
846 s,
847 _origin);
848 std::pair<NR::scale, bool> sn = m.freeSnapScale(Snapper::SNAP_POINT,
849 _snap_points,
850 it,
851 s,
852 _origin);
854 /* Pick the snap that puts us closest to the original scale */
855 NR::Coord bd = bb.second ?
856 fabs(NR::L2(NR::Point(bb.first[NR::X], bb.first[NR::Y])) -
857 NR::L2(NR::Point(s[NR::X], s[NR::Y])))
858 : NR_HUGE;
859 NR::Coord sd = sn.second ?
860 fabs(NR::L2(NR::Point(sn.first[NR::X], sn.first[NR::Y])) -
861 NR::L2(NR::Point(s[NR::X], s[NR::Y])))
862 : NR_HUGE;
863 s = (bd < sd) ? bb.first : sn.first;
864 }
866 /* Update the knot position */
867 pt = ( _point - _origin ) * s + _origin;
869 /* Status text */
870 _message_context.setF(Inkscape::NORMAL_MESSAGE,
871 _("<b>Scale</b>: %0.2f%% x %0.2f%%; with <b>Ctrl</b> to lock ratio"),
872 100 * s[NR::X], 100 * s[NR::Y]);
874 return TRUE;
875 }
877 gboolean Inkscape::SelTrans::stretchRequest(SPSelTransHandle const &handle, NR::Point &pt, guint state)
878 {
879 using NR::X;
880 using NR::Y;
882 NR::Dim2 axis, perp;
884 switch (handle.cursor) {
885 case GDK_TOP_SIDE:
886 case GDK_BOTTOM_SIDE:
887 axis = NR::Y;
888 perp = NR::X;
889 break;
890 case GDK_LEFT_SIDE:
891 case GDK_RIGHT_SIDE:
892 axis = NR::X;
893 perp = NR::Y;
894 break;
895 default:
896 g_assert_not_reached();
897 return TRUE;
898 };
900 if ( fabs( _point[axis] - _origin[axis] ) < 1e-15 ) {
901 return FALSE;
902 }
904 NR::scale s(1, 1);
905 s[axis] = ( ( pt[axis] - _origin[axis] )
906 / ( _point[axis] - _origin[axis] ) );
907 if ( fabs(s[axis]) < 1e-15 ) {
908 s[axis] = 1e-15;
909 }
911 /* Get a STL list of the selected items.
912 ** FIXME: this should probably be done by Inkscape::Selection.
913 */
914 std::list<SPItem const*> it;
915 for (GSList const *i = _selection->itemList(); i != NULL; i = i->next) {
916 it.push_back(reinterpret_cast<SPItem*>(i->data));
917 }
919 SnapManager const &m = _desktop->namedview->snap_manager;
921 if ( state & GDK_CONTROL_MASK ) {
922 s[perp] = fabs(s[axis]);
924 std::pair<NR::Coord, bool> const bb = m.freeSnapStretch(
925 Snapper::BBOX_POINT,
926 _bbox_points,
927 it,
928 s[axis],
929 _origin,
930 axis,
931 true);
933 std::pair<NR::Coord, bool> const sn = m.freeSnapStretch(
934 Snapper::SNAP_POINT,
935 _snap_points,
936 it,
937 s[axis],
938 _origin,
939 axis,
940 true);
942 NR::Coord const bd = bb.second ? fabs(bb.first - s[axis]) : NR_HUGE;
943 NR::Coord const sd = sn.second ? fabs(sn.first - s[axis]) : NR_HUGE;
944 NR::Coord const ratio = (bd < sd) ? bb.first : sn.first;
946 s[axis] = fabs(ratio) * sign(s[axis]);
947 s[perp] = fabs(s[axis]);
948 } else {
950 std::pair<NR::Coord, bool> const bb = m.freeSnapStretch(
951 Snapper::BBOX_POINT,
952 _bbox_points,
953 it,
954 s[axis],
955 _origin,
956 axis,
957 false);
959 std::pair<NR::Coord, bool> const sn = m.freeSnapStretch(
960 Snapper::SNAP_POINT,
961 _snap_points,
962 it,
963 s[axis],
964 _origin,
965 axis,
966 false);
968 /* Choose the smaller difference in scale */
969 NR::Coord const bd = bb.second ? fabs(bb.first - s[axis]) : NR_HUGE;
970 NR::Coord const sd = sn.second ? fabs(sn.first - s[axis]) : NR_HUGE;
971 s[axis] = (bd < sd) ? bb.first : sn.first;
972 s[perp] = 1;
973 }
975 pt = ( _point - _origin ) * NR::scale(s) + _origin;
976 if (isNaN(pt[X] + pt[Y])) {
977 g_warning("point=(%g, %g), norm=(%g, %g), s=(%g, %g)\n",
978 _point[X], _point[Y], _origin[X], _origin[Y], s[X], s[Y]);
979 }
981 // status text
982 _message_context.setF(Inkscape::NORMAL_MESSAGE,
983 _("<b>Scale</b>: %0.2f%% x %0.2f%%; with <b>Ctrl</b> to lock ratio"),
984 100 * s[NR::X], 100 * s[NR::Y]);
986 return TRUE;
987 }
989 gboolean Inkscape::SelTrans::skewRequest(SPSelTransHandle const &handle, NR::Point &pt, guint state)
990 {
991 using NR::X;
992 using NR::Y;
994 if (handle.cursor != GDK_SB_V_DOUBLE_ARROW && handle.cursor != GDK_SB_H_DOUBLE_ARROW) {
995 return FALSE;
996 }
998 NR::Dim2 dim_a;
999 NR::Dim2 dim_b;
1000 if (handle.cursor == GDK_SB_V_DOUBLE_ARROW) {
1001 dim_a = X;
1002 dim_b = Y;
1003 } else {
1004 dim_a = Y;
1005 dim_b = X;
1006 }
1008 double skew[2];
1009 double s[2] = { 1.0, 1.0 };
1011 if (fabs(_point[dim_a] - _origin[dim_a]) < NR_EPSILON) {
1012 return FALSE;
1013 }
1015 skew[dim_a] = ( pt[dim_b] - _point[dim_b] ) / ( _point[dim_a] - _origin[dim_a] );
1017 s[dim_a] = ( pt[dim_a] - _origin[dim_a] ) / ( _point[dim_a] - _origin[dim_a] );
1019 if ( fabs(s[dim_a]) < 1 ) {
1020 s[dim_a] = sign(s[dim_a]);
1021 } else {
1022 s[dim_a] = floor( s[dim_a] + 0.5 );
1023 }
1025 double radians = atan(skew[dim_a] / s[dim_a]);
1027 if (state & GDK_CONTROL_MASK) {
1029 int snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
1031 if (snaps) {
1032 double sections = floor( radians * snaps / M_PI + .5 );
1033 if (fabs(sections) >= snaps / 2) sections = sign(sections) * (snaps / 2 - 1);
1034 radians = ( M_PI / snaps ) * sections;
1035 }
1036 skew[dim_a] = tan(radians) * s[dim_a];
1037 } else {
1038 SnapManager const &m = _desktop->namedview->snap_manager;
1040 std::pair<NR::Coord, bool> bb = m.freeSnapSkew(Inkscape::Snapper::BBOX_POINT,
1041 _bbox_points,
1042 std::list<SPItem const *>(),
1043 skew[dim_a],
1044 _origin,
1045 dim_a);
1047 std::pair<NR::Coord, bool> sn = m.freeSnapSkew(Inkscape::Snapper::SNAP_POINT,
1048 _snap_points,
1049 std::list<SPItem const *>(),
1050 skew[dim_a],
1051 _origin,
1052 dim_a);
1054 if (bb.second || sn.second) {
1055 /* We snapped something, so change the skew to reflect it */
1056 NR::Coord const bd = bb.second ? bb.first : NR_HUGE;
1057 NR::Coord const sd = sn.second ? sn.first : NR_HUGE;
1058 skew[dim_a] = std::min(bd, sd);
1059 }
1060 }
1062 pt[dim_b] = ( _point[dim_a] - _origin[dim_a] ) * skew[dim_a] + _point[dim_b];
1063 pt[dim_a] = ( _point[dim_a] - _origin[dim_a] ) * s[dim_a] + _origin[dim_a];
1065 /* status text */
1066 double degrees = 180 / M_PI * radians;
1067 if (degrees > 180) degrees -= 360;
1068 if (degrees < -180) degrees += 360;
1070 _message_context.setF(Inkscape::NORMAL_MESSAGE,
1071 // TRANSLATORS: don't modify the first ";"
1072 // (it will NOT be displayed as ";" - only the second one will be)
1073 _("<b>Skew</b>: %0.2f°; with <b>Ctrl</b> to snap angle"),
1074 degrees);
1076 return TRUE;
1077 }
1079 gboolean Inkscape::SelTrans::rotateRequest(NR::Point &pt, guint state)
1080 {
1081 int snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
1083 // rotate affine in rotate
1084 NR::Point const d1 = _point - _origin;
1085 NR::Point const d2 = pt - _origin;
1087 NR::Coord const h1 = NR::L2(d1);
1088 if (h1 < 1e-15) return FALSE;
1089 NR::Point q1 = d1 / h1;
1090 NR::Coord const h2 = NR::L2(d2);
1091 if (fabs(h2) < 1e-15) return FALSE;
1092 NR::Point q2 = d2 / h2;
1094 double radians;
1095 if (state & GDK_CONTROL_MASK) {
1096 /* Have to restrict movement. */
1097 double cos_t = NR::dot(q1, q2);
1098 double sin_t = NR::dot(NR::rot90(q1), q2);
1099 radians = atan2(sin_t, cos_t);
1100 if (snaps) {
1101 radians = ( M_PI / snaps ) * floor( radians * snaps / M_PI + .5 );
1102 }
1103 q1 = NR::Point(1, 0);
1104 q2 = NR::Point(cos(radians), sin(radians));
1105 } else {
1106 radians = atan2(NR::dot(NR::rot90(d1), d2),
1107 NR::dot(d1, d2));
1108 }
1110 NR::rotate const r1(q1);
1111 NR::rotate const r2(q2);
1112 pt = _point * NR::translate(-_origin) * ( r2 / r1 ) * NR::translate(_origin);
1114 /* status text */
1115 double degrees = 180 / M_PI * radians;
1116 if (degrees > 180) degrees -= 360;
1117 if (degrees < -180) degrees += 360;
1119 _message_context.setF(Inkscape::NORMAL_MESSAGE,
1120 // TRANSLATORS: don't modify the first ";"
1121 // (it will NOT be displayed as ";" - only the second one will be)
1122 _("<b>Rotate</b>: %0.2f°; with <b>Ctrl</b> to snap angle"), degrees);
1124 return TRUE;
1125 }
1127 gboolean Inkscape::SelTrans::centerRequest(NR::Point &pt, guint state)
1128 {
1129 using NR::X;
1130 using NR::Y;
1132 SnapManager const &m = _desktop->namedview->snap_manager;
1133 pt = m.freeSnap(Snapper::SNAP_POINT, pt, NULL).getPoint();
1135 if (state & GDK_CONTROL_MASK) {
1136 if ( fabs(_point[X] - pt[X]) > fabs(_point[Y] - pt[Y]) ) {
1137 pt[Y] = _point[Y];
1138 } else {
1139 pt[X] = _point[X];
1140 }
1141 }
1143 if (!(state & GDK_SHIFT_MASK)) {
1144 // screen pixels to snap center to bbox
1145 #define SNAP_DIST 5
1146 // FIXME: take from prefs
1147 double snap_dist = SNAP_DIST / _desktop->current_zoom();
1149 for (int i = 0; i < 2; i++) {
1151 if (fabs(pt[i] - _box.min()[i]) < snap_dist) {
1152 pt[i] = _box.min()[i];
1153 }
1154 if (fabs(pt[i] - _box.midpoint()[i]) < snap_dist) {
1155 pt[i] = _box.midpoint()[i];
1156 }
1157 if (fabs(pt[i] - _box.max()[i]) < snap_dist) {
1158 pt[i] = _box.max()[i];
1159 }
1160 }
1161 }
1163 // status text
1164 GString *xs = SP_PX_TO_METRIC_STRING(pt[X], _desktop->namedview->getDefaultMetric());
1165 GString *ys = SP_PX_TO_METRIC_STRING(pt[Y], _desktop->namedview->getDefaultMetric());
1166 _message_context.setF(Inkscape::NORMAL_MESSAGE, _("Move <b>center</b> to %s, %s"), xs->str, ys->str);
1167 g_string_free(xs, FALSE);
1168 g_string_free(ys, FALSE);
1170 return TRUE;
1171 }
1173 /*
1174 * handlers for handle movement
1175 *
1176 */
1178 void sp_sel_trans_stretch(Inkscape::SelTrans *seltrans, SPSelTransHandle const &handle, NR::Point &pt, guint state)
1179 {
1180 seltrans->stretch(handle, pt, state);
1181 }
1183 void sp_sel_trans_scale(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, NR::Point &pt, guint state)
1184 {
1185 seltrans->scale(pt, state);
1186 }
1188 void sp_sel_trans_skew(Inkscape::SelTrans *seltrans, SPSelTransHandle const &handle, NR::Point &pt, guint state)
1189 {
1190 seltrans->skew(handle, pt, state);
1191 }
1193 void sp_sel_trans_rotate(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, NR::Point &pt, guint state)
1194 {
1195 seltrans->rotate(pt, state);
1196 }
1198 void Inkscape::SelTrans::stretch(SPSelTransHandle const &handle, NR::Point &pt, guint state)
1199 {
1200 using NR::X;
1201 using NR::Y;
1203 NR::Dim2 dim;
1204 switch (handle.cursor) {
1205 case GDK_LEFT_SIDE:
1206 case GDK_RIGHT_SIDE:
1207 dim = X;
1208 break;
1209 case GDK_TOP_SIDE:
1210 case GDK_BOTTOM_SIDE:
1211 dim = Y;
1212 break;
1213 default:
1214 g_assert_not_reached();
1215 abort();
1216 break;
1217 }
1219 NR::Point const scale_origin(_origin);
1220 double const offset = _point[dim] - scale_origin[dim];
1221 if (!( fabs(offset) >= 1e-15 )) {
1222 return;
1223 }
1224 NR::scale s(1, 1);
1225 s[dim] = ( pt[dim] - scale_origin[dim] ) / offset;
1226 if (isNaN(s[dim])) {
1227 g_warning("s[dim]=%g, pt[dim]=%g, scale_origin[dim]=%g, point[dim]=%g\n",
1228 s[dim], pt[dim], scale_origin[dim], _point[dim]);
1229 }
1230 if (!( fabs(s[dim]) >= 1e-15 )) {
1231 s[dim] = 1e-15;
1232 }
1233 if (state & GDK_CONTROL_MASK) {
1234 /* Preserve aspect ratio, but never flip in the dimension not being edited. */
1235 s[!dim] = fabs(s[dim]);
1236 }
1238 NR::Point new_bbox_min = _box.min() * (NR::translate(-scale_origin) * NR::Matrix(s) * NR::translate(scale_origin));
1239 NR::Point new_bbox_max = _box.max() * (NR::translate(-scale_origin) * NR::Matrix(s) * NR::translate(scale_origin));
1241 int transform_stroke = prefs_get_int_attribute ("options.transform", "stroke", 1);
1242 NR::Matrix scaler = get_scale_transform_with_stroke (_box, _strokewidth, transform_stroke,
1243 new_bbox_min[NR::X], new_bbox_min[NR::Y], new_bbox_max[NR::X], new_bbox_max[NR::Y]);
1245 transform(scaler, NR::Point(0, 0)); // we have already accounted for origin, so pass 0,0
1246 }
1248 void Inkscape::SelTrans::scale(NR::Point &pt, guint state)
1249 {
1250 NR::Point const offset = _point - _origin;
1252 NR::scale s (1, 1);
1253 for (int i = NR::X; i <= NR::Y; i++) {
1254 if (fabs(offset[i]) > 1e-9)
1255 s[i] = (pt[i] - _origin[i]) / offset[i];
1256 if (fabs(s[i]) < 1e-9)
1257 s[i] = 1e-9;
1258 }
1259 NR::Point new_bbox_min = _box.min() * (NR::translate(-_origin) * NR::Matrix(s) * NR::translate(_origin));
1260 NR::Point new_bbox_max = _box.max() * (NR::translate(-_origin) * NR::Matrix(s) * NR::translate(_origin));
1262 int transform_stroke = prefs_get_int_attribute ("options.transform", "stroke", 1);
1263 NR::Matrix scaler = get_scale_transform_with_stroke (_box, _strokewidth, transform_stroke,
1264 new_bbox_min[NR::X], new_bbox_min[NR::Y], new_bbox_max[NR::X], new_bbox_max[NR::Y]);
1266 transform(scaler, NR::Point(0, 0)); // we have already accounted for origin, so pass 0,0
1267 }
1269 void Inkscape::SelTrans::skew(SPSelTransHandle const &handle, NR::Point &pt, guint state)
1270 {
1271 NR::Point const offset = _point - _origin;
1273 unsigned dim;
1274 switch (handle.cursor) {
1275 case GDK_SB_H_DOUBLE_ARROW:
1276 dim = NR::Y;
1277 break;
1278 case GDK_SB_V_DOUBLE_ARROW:
1279 dim = NR::X;
1280 break;
1281 default:
1282 g_assert_not_reached();
1283 abort();
1284 break;
1285 }
1286 if (fabs(offset[dim]) < 1e-15) {
1287 return;
1288 }
1289 NR::Matrix skew = NR::identity();
1290 skew[2*dim + dim] = (pt[dim] - _origin[dim]) / offset[dim];
1291 skew[2*dim + (1-dim)] = (pt[1-dim] - _point[1-dim]) / offset[dim];
1292 skew[2*(1-dim) + (dim)] = 0;
1293 skew[2*(1-dim) + (1-dim)] = 1;
1295 for (int i = 0; i < 2; i++) {
1296 if (fabs(skew[3*i]) < 1e-15) {
1297 skew[3*i] = 1e-15;
1298 }
1299 }
1300 transform(skew, _origin);
1301 }
1303 void Inkscape::SelTrans::rotate(NR::Point &pt, guint state)
1304 {
1305 NR::Point const offset = _point - _origin;
1307 NR::Coord const h1 = NR::L2(offset);
1308 if (h1 < 1e-15) {
1309 return;
1310 }
1311 NR::Point const q1 = offset / h1;
1312 NR::Coord const h2 = NR::L2( pt - _origin );
1313 if (h2 < 1e-15) {
1314 return;
1315 }
1316 NR::Point const q2 = (pt - _origin) / h2;
1317 NR::rotate const r1(q1);
1318 NR::rotate const r2(q2);
1320 NR::Matrix rotate( r2 / r1 );
1321 transform(rotate, _origin);
1322 }
1324 void sp_sel_trans_center(Inkscape::SelTrans *seltrans, SPSelTransHandle const &, NR::Point &pt, guint state)
1325 {
1326 seltrans->setCenter(pt);
1327 }
1330 void Inkscape::SelTrans::moveTo(NR::Point const &xy, guint state)
1331 {
1332 SnapManager const &m = _desktop->namedview->snap_manager;
1334 /* The amount that we've moved by during this drag */
1335 NR::Point dxy = xy - _point;
1337 /* Get a STL list of the selected items.
1338 ** FIXME: this should probably be done by Inkscape::Selection.
1339 */
1340 std::list<SPItem const*> it;
1341 for (GSList const *i = _selection->itemList(); i != NULL; i = i->next) {
1342 it.push_back(reinterpret_cast<SPItem*>(i->data));
1343 }
1345 bool const alt = (state & GDK_MOD1_MASK);
1346 bool const control = (state & GDK_CONTROL_MASK);
1347 bool const shift = (state & GDK_SHIFT_MASK);
1349 if (alt) {
1351 /* Alt pressed means keep offset: snap the moved distance to the grid.
1352 ** FIXME: this will snap to more than just the grid, nowadays.
1353 */
1355 dxy = m.freeSnap(Snapper::SNAP_POINT, dxy, NULL).getPoint();
1357 } else if (!shift) {
1359 /* We're snapping to things, possibly with a constraint to horizontal or
1360 ** vertical movement. Obtain a list of possible translations and then
1361 ** pick the smallest.
1362 */
1364 /* This will be our list of possible translations */
1365 std::list<std::pair<NR::Point, bool> > s;
1367 if (control) {
1369 /* Snap to things, and also constrain to horizontal or vertical movement */
1371 for (unsigned int dim = 0; dim < 2; dim++) {
1372 s.push_back(m.constrainedSnapTranslation(Inkscape::Snapper::BBOX_POINT,
1373 _bbox_points,
1374 it,
1375 Inkscape::Snapper::ConstraintLine(component_vectors[dim]),
1376 dxy));
1378 s.push_back(m.constrainedSnapTranslation(Inkscape::Snapper::SNAP_POINT,
1379 _snap_points,
1380 it,
1381 Inkscape::Snapper::ConstraintLine(component_vectors[dim]),
1382 dxy));
1383 }
1385 } else {
1387 /* Snap to things with no constraint */
1389 s.push_back(m.freeSnapTranslation(Inkscape::Snapper::BBOX_POINT,
1390 _bbox_points, it, dxy));
1391 s.push_back(m.freeSnapTranslation(Inkscape::Snapper::SNAP_POINT,
1392 _snap_points, it, dxy));
1393 }
1395 /* Pick one */
1396 NR::Coord best = NR_HUGE;
1397 for (std::list<std::pair<NR::Point, bool> >::const_iterator i = s.begin(); i != s.end(); i++) {
1398 if (i->second) {
1399 NR::Coord const m = NR::L2(i->first);
1400 if (m < best) {
1401 best = m;
1402 dxy = i->first;
1403 }
1404 }
1405 }
1406 }
1408 if (control) {
1409 /* Ensure that the horizontal and vertical constraint has been applied */
1410 if (fabs(dxy[NR::X]) > fabs(dxy[NR::Y])) {
1411 dxy[NR::Y] = 0;
1412 } else {
1413 dxy[NR::X] = 0;
1414 }
1415 }
1417 NR::Matrix const move((NR::translate(dxy)));
1418 NR::Point const norm(0, 0);
1419 transform(move, norm);
1421 // status text
1422 GString *xs = SP_PX_TO_METRIC_STRING(dxy[NR::X], _desktop->namedview->getDefaultMetric());
1423 GString *ys = SP_PX_TO_METRIC_STRING(dxy[NR::Y], _desktop->namedview->getDefaultMetric());
1424 _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);
1425 g_string_free(xs, TRUE);
1426 g_string_free(ys, TRUE);
1427 }
1430 /*
1431 Local Variables:
1432 mode:c++
1433 c-file-style:"stroustrup"
1434 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1435 indent-tabs-mode:nil
1436 fill-column:99
1437 End:
1438 */
1439 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :