src/shape-editor.cpp

   1 #define __SHAPE_EDITOR_CPP__
   2
   3 /*
   4  * Inkscape::ShapeEditor
   5  *
   6  * Authors:
   7  *   bulia byak <buliabyak@users.sf.net>
   8  *
   9  */
  10
  11 #ifdef HAVE_CONFIG_H
  12 #include "config.h"
  13 #endif
  14
  15 #include <string.h>
  16 #include <glibmm/i18n.h>
  17
  18 #include "sp-object.h"
  19 #include "sp-item.h"
  20 #include "live_effects/lpeobject.h"
  21 #include "selection.h"
  22 #include "desktop.h"
  23 #include "document.h"
  24 #include "desktop-handles.h"
  25 #include "knotholder.h"
  26 #include "live_effects/parameter/point.h"
  27 #include "nodepath.h"
  28 #include "xml/node-event-vector.h"
  29 #include "preferences.h"
  30 #include "object-edit.h"
  31 #include "style.h"
  32 #include "display/curve.h"
  33 #include <2geom/pathvector.h>
  34
  35 #include "shape-editor.h"
  36
  37
  38 ShapeEditorsCollective::ShapeEditorsCollective(SPDesktop */*dt*/) {
  39 }
  40
  41 ShapeEditorsCollective::~ShapeEditorsCollective() {
  42 }
  43
  44
  45 void ShapeEditorsCollective::update_statusbar() {
  46
  47 //!!! move from nodepath: sp_nodepath_update_statusbar but summing for all nodepaths
  48
  49 }
  50
  51 ShapeEditor::ShapeEditor(SPDesktop *dt) {
  52     this->desktop = dt;
  53     this->grab_node = -1;
  54     this->nodepath = NULL;
  55     this->knotholder = NULL;
  56     this->hit = false;
  57     this->knotholder_listener_attached_for = NULL;
  58     this->nodepath_listener_attached_for = NULL;
  59 }
  60
  61 ShapeEditor::~ShapeEditor() {
  62     unset_item(SH_KNOTHOLDER);
  63     unset_item(SH_NODEPATH);
  64 }
  65
  66 void ShapeEditor::unset_item(SubType type, bool keep_knotholder) {
  67     Inkscape::XML::Node *old_repr = NULL;
  68
  69     switch (type) {
  70         case SH_NODEPATH:
  71             if (this->nodepath) {
  72                 old_repr = this->nodepath->repr;
  73                 if (old_repr && old_repr == nodepath_listener_attached_for) {
  74                     sp_repr_remove_listener_by_data(old_repr, this);
  75                     Inkscape::GC::release(old_repr);
  76                     nodepath_listener_attached_for = NULL;
  77                 }
  78
  79                 this->grab_node = -1;
  80                 delete this->nodepath;
  81                 this->nodepath = NULL;
  82             }
  83             break;
  84         case SH_KNOTHOLDER:
  85             if (this->knotholder) {
  86                 old_repr = this->knotholder->repr;
  87                 if (old_repr && old_repr == knotholder_listener_attached_for) {
  88                     sp_repr_remove_listener_by_data(old_repr, this);
  89                     Inkscape::GC::release(old_repr);
  90                     knotholder_listener_attached_for = NULL;
  91                 }
  92
  93                 if (!keep_knotholder) {
  94                     delete this->knotholder;
  95                     this->knotholder = NULL;
  96                 }
  97             }
  98             break;
  99     }
 100 }
 101
 102 bool ShapeEditor::has_nodepath () {
 103     return (this->nodepath != NULL);
 104 }
 105
 106 bool ShapeEditor::has_knotholder () {
 107     return (this->knotholder != NULL);
 108 }
 109
 110 void ShapeEditor::update_knotholder () {
 111     if (this->knotholder)
 112         this->knotholder->update_knots();
 113 }
 114
 115 bool ShapeEditor::has_local_change (SubType type) {
 116     switch (type) {
 117         case SH_NODEPATH:
 118             return (this->nodepath && this->nodepath->local_change);
 119         case SH_KNOTHOLDER:
 120             return (this->knotholder && this->knotholder->local_change != 0);
 121         default:
 122             g_assert_not_reached();
 123     }
 124 }
 125
 126 void ShapeEditor::decrement_local_change (SubType type) {
 127     switch (type) {
 128         case SH_NODEPATH:
 129             if (this->nodepath && this->nodepath->local_change > 0) {
 130                 this->nodepath->local_change--;
 131             }
 132             break;
 133         case SH_KNOTHOLDER:
 134             if (this->knotholder) {
 135                 this->knotholder->local_change = FALSE;
 136             }
 137             break;
 138         default:
 139             g_assert_not_reached();
 140     }
 141 }
 142
 143 const SPItem *ShapeEditor::get_item (SubType type) {
 144     const SPItem *item = NULL;
 145     switch (type) {
 146         case SH_NODEPATH:
 147             if (this->has_nodepath()) {
 148                 item = this->nodepath->item;
 149             }
 150             break;
 151         case SH_KNOTHOLDER:
 152             if (this->has_knotholder()) {
 153                 item = this->knotholder->getItem();
 154             }
 155             break;
 156     }
 157     return item;
 158 }
 159
 160 GList *ShapeEditor::save_nodepath_selection () {
 161     if (this->nodepath)
 162         return ::save_nodepath_selection (this->nodepath);
 163     return NULL;
 164 }
 165
 166 void ShapeEditor::restore_nodepath_selection (GList *saved) {
 167     if (this->nodepath && saved)
 168         ::restore_nodepath_selection (this->nodepath, saved);
 169 }
 170
 171 bool ShapeEditor::nodepath_edits_repr_key(gchar const *name) {
 172     if (nodepath && name) {
 173         return ( !strcmp(name, nodepath->repr_key) || !strcmp(name, nodepath->repr_nodetypes_key) );
 174     }
 175
 176     return false;
 177 }
 178
 179
 180 void ShapeEditor::shapeeditor_event_attr_changed(gchar const *name)
 181 {
 182     gboolean changed_np = FALSE;
 183     gboolean changed_kh = FALSE;
 184
 185     if (has_nodepath() && nodepath_edits_repr_key(name))
 186     {
 187         changed_np = !has_local_change(SH_NODEPATH);
 188         decrement_local_change(SH_NODEPATH);
 189     }
 190
 191     if (changed_np) {
 192         GList *saved = NULL;
 193         if (has_nodepath()) {
 194             saved = save_nodepath_selection();
 195         }
 196
 197         reset_item(SH_NODEPATH);
 198
 199         if (has_nodepath() && saved) {
 200             restore_nodepath_selection(saved);
 201             g_list_free (saved);
 202         }
 203     }
 204
 205     if (has_knotholder())
 206     {
 207         changed_kh = !has_local_change(SH_KNOTHOLDER);
 208         decrement_local_change(SH_KNOTHOLDER);
 209         if (changed_kh) {
 210             // this can happen if an LPEItem's knotholder handle was dragged, in which case we want
 211             // to keep the knotholder; in all other cases (e.g., if the LPE itself changes) we delete it
 212             reset_item(SH_KNOTHOLDER, !strcmp(name, "d"));
 213         }
 214     }
 215
 216     update_statusbar(); //TODO: get_container()->update_statusbar();
 217 }
 218
 219
 220 static void shapeeditor_event_attr_changed(Inkscape::XML::Node */*repr*/, gchar const *name,
 221                                            gchar const */*old_value*/, gchar const */*new_value*/,
 222                                            bool /*is_interactive*/, gpointer data)
 223 {
 224     g_assert(data);
 225     ShapeEditor *sh = ((ShapeEditor *) data);
 226
 227     sh->shapeeditor_event_attr_changed(name);
 228 }
 229
 230 static Inkscape::XML::NodeEventVector shapeeditor_repr_events = {
 231     NULL, /* child_added */
 232     NULL, /* child_removed */
 233     shapeeditor_event_attr_changed,
 234     NULL, /* content_changed */
 235     NULL  /* order_changed */
 236 };
 237
 238
 239 void ShapeEditor::set_item(SPItem *item, SubType type, bool keep_knotholder) {
 240     // this happens (and should only happen) when for an LPEItem having both knotholder and
 241     // nodepath the knotholder is adapted; in this case we don't want to delete the knotholder
 242     // since this freezes the handles
 243     unset_item(type, keep_knotholder);
 244
 245     this->grab_node = -1;
 246
 247     if (item) {
 248         Inkscape::XML::Node *repr;
 249         switch(type) {
 250             case SH_NODEPATH:
 251                 if (SP_IS_LPE_ITEM(item)) {
 252                     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 253                     this->nodepath = sp_nodepath_new(desktop, item, (prefs->getBool("/tools/nodes/show_handles", true)));
 254                 }
 255                 if (this->nodepath) {
 256                     this->nodepath->shape_editor = this;
 257
 258                     // setting new listener
 259                     repr = SP_OBJECT_REPR(item);
 260                     if (repr != nodepath_listener_attached_for) {
 261                         Inkscape::GC::anchor(repr);
 262                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 263                         nodepath_listener_attached_for = repr;
 264                     }
 265                 }
 266                 break;
 267
 268             case SH_KNOTHOLDER:
 269                 if (!this->knotholder) {
 270                     // only recreate knotholder if none is present
 271                     this->knotholder = sp_item_knot_holder(item, desktop);
 272                 }
 273                 if (this->knotholder) {
 274                     this->knotholder->update_knots();
 275                     // setting new listener
 276                     repr = this->knotholder->repr;
 277                     if (repr != knotholder_listener_attached_for) {
 278                         Inkscape::GC::anchor(repr);
 279                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 280                         knotholder_listener_attached_for = repr;
 281                     }
 282                 }
 283                 break;
 284         }
 285     }
 286 }
 287
 288 /** Please note that this function only works for path parameters.
 289 *  All other parameters probably will crash Inkscape!
 290 */
 291 void ShapeEditor::set_item_lpe_path_parameter(SPItem *item, LivePathEffectObject *lpeobject, const char * key)
 292 {
 293     unset_item(SH_NODEPATH);
 294
 295     this->grab_node = -1;
 296
 297     if (lpeobject) {
 298         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 299         this->nodepath = sp_nodepath_new( desktop, lpeobject,
 300                                           (prefs->getInt("/tools/nodes/show_handles", true)),
 301                                           key, item);
 302         if (this->nodepath) {
 303             this->nodepath->shape_editor = this;
 304
 305             // setting new listener
 306             Inkscape::XML::Node *repr = SP_OBJECT_REPR(lpeobject);
 307             if (repr && repr != nodepath_listener_attached_for) {
 308                 Inkscape::GC::anchor(repr);
 309                 sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 310                 nodepath_listener_attached_for = repr;
 311             }
 312         }
 313     }
 314 }
 315
 316
 317 /** FIXME: This thing is only called when the item needs to be updated in response to repr change.
 318    Why not make a reload function in NodePath and in KnotHolder? */
 319 void ShapeEditor::reset_item (SubType type, bool keep_knotholder)
 320 {
 321     switch (type) {
 322         case SH_NODEPATH:
 323             if ( (nodepath) && (IS_LIVEPATHEFFECT(nodepath->object)) ) {
 324                 char * key = g_strdup(nodepath->repr_key);
 325                 set_item_lpe_path_parameter(nodepath->item, LIVEPATHEFFECT(nodepath->object), key); // the above checks for nodepath, so it is indeed a path that we are editing
 326                 g_free(key);
 327             } else {
 328                 SPObject *obj = sp_desktop_document(desktop)->getObjectByRepr(nodepath_listener_attached_for); /// note that it is not certain that this is an SPItem; it could be a LivePathEffectObject.
 329                 set_item(SP_ITEM(obj), SH_NODEPATH);
 330             }
 331             break;
 332         case SH_KNOTHOLDER:
 333             if ( knotholder ) {
 334                 SPObject *obj = sp_desktop_document(desktop)->getObjectByRepr(knotholder_listener_attached_for); /// note that it is not certain that this is an SPItem; it could be a LivePathEffectObject.
 335                 set_item(SP_ITEM(obj), SH_KNOTHOLDER, keep_knotholder);
 336             }
 337             break;
 338     }
 339 }
 340
 341 void ShapeEditor::nodepath_destroyed () {
 342     this->nodepath = NULL;
 343 }
 344
 345 void ShapeEditor::update_statusbar () {
 346     if (this->nodepath)
 347         sp_nodepath_update_statusbar(this->nodepath);
 348 }
 349
 350 bool ShapeEditor::is_over_stroke (Geom::Point event_p, bool remember) {
 351     if (!this->nodepath)
 352         return false; // no stroke in knotholder
 353
 354     const SPItem *item = get_item(SH_NODEPATH);
 355
 356     if (!item || !SP_IS_ITEM(item))
 357         return false;
 358
 359     //Translate click point into proper coord system
 360     this->curvepoint_doc = desktop->w2d(event_p);
 361     this->curvepoint_doc *= sp_item_dt2i_affine(item);
 362
 363     SPCurve *curve = this->nodepath->curve;   // not sure if np->curve is always up to date...
 364     Geom::PathVector const &pathv = curve->get_pathvector();
 365     boost::optional<Geom::PathVectorPosition> pvpos = Geom::nearestPoint(pathv, this->curvepoint_doc);
 366     if (!pvpos) {
 367         g_print("Warning! Possible error?\n");
 368         return false;
 369     }
 370
 371     Geom::Point nearest = pathv[pvpos->path_nr].pointAt(pvpos->t);
 372     Geom::Point delta = nearest - this->curvepoint_doc;
 373
 374     delta = desktop->d2w(delta);
 375
 376     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 377     double stroke_tolerance =
 378         (( !SP_OBJECT_STYLE(item)->stroke.isNone() ?
 379            desktop->current_zoom() *
 380            SP_OBJECT_STYLE (item)->stroke_width.computed * 0.5 *
 381            to_2geom(sp_item_i2d_affine(item)).descrim()
 382          : 0.0)
 383          + prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100)) / to_2geom(sp_item_i2d_affine(item)).descrim();
 384     bool close = (Geom::L2 (delta) < stroke_tolerance);
 385
 386     if (remember && close) {
 387         // calculate index for nodepath's representation.
 388         double int_part;
 389         double t = std::modf(pvpos->t, &int_part);
 390         unsigned int segment_index = (unsigned int)int_part + 1;
 391         for (unsigned int i = 0; i < pvpos->path_nr; ++i) {
 392             segment_index += pathv[i].size() + 1;
 393             if (pathv[i].closed())
 394                 segment_index += 1;
 395         }
 396
 397         this->curvepoint_event[Geom::X] = (gint) event_p [Geom::X];
 398         this->curvepoint_event[Geom::Y] = (gint) event_p [Geom::Y];
 399         this->hit = true;
 400         this->grab_t = t;
 401         this->grab_node = segment_index;
 402     }
 403
 404     return close;
 405 }
 406
 407 void ShapeEditor::add_node_near_point() {
 408     if (this->nodepath) {
 409         sp_nodepath_add_node_near_point(this->nodepath, this->curvepoint_doc);
 410     } else if (this->knotholder) {
 411         // we do not add nodes in knotholder... yet
 412     }
 413 }
 414
 415 void ShapeEditor::select_segment_near_point(bool toggle) {
 416     if (this->nodepath) {
 417         sp_nodepath_select_segment_near_point(this->nodepath, this->curvepoint_doc, toggle);
 418     }
 419     if (this->knotholder) {
 420         // we do not select segments in knotholder... yet?
 421     }
 422 }
 423
 424 void ShapeEditor::cancel_hit() {
 425     this->hit = false;
 426 }
 427
 428 bool ShapeEditor::hits_curve() {
 429     return (this->hit);
 430 }
 431
 432
 433 void ShapeEditor::curve_drag(gdouble eventx, gdouble eventy) {
 434     if (this->nodepath && !this->nodepath->straight_path) {
 435
 436         if (this->grab_node == -1) // don't know which segment to drag
 437             return;
 438
 439         // We round off the extra precision in the motion coordinates provided
 440         // by some input devices (like tablets). As we'll store the coordinates
 441         // as integers in curvepoint_event we need to do this rounding before
 442         // comparing them with the last coordinates from curvepoint_event.
 443         // See bug #1593499 for details.
 444
 445         gint x = (gint) Inkscape::round(eventx);
 446         gint y = (gint) Inkscape::round(eventy);
 447
 448
 449         // The coordinates hasn't changed since the last motion event, abort
 450         if (this->curvepoint_event[Geom::X] == x &&
 451             this->curvepoint_event[Geom::Y] == y)
 452             return;
 453
 454         Geom::Point const delta_w(eventx - this->curvepoint_event[Geom::X],
 455                                   eventy - this->curvepoint_event[Geom::Y]);
 456         Geom::Point const delta_dt(this->desktop->w2d(delta_w));
 457
 458         sp_nodepath_curve_drag (this->nodepath, this->grab_node, this->grab_t, delta_dt);
 459         this->curvepoint_event[Geom::X] = x;
 460         this->curvepoint_event[Geom::Y] = y;
 461
 462     }
 463     if (this->knotholder) {
 464         // we do not drag curve in knotholder
 465     }
 466
 467 }
 468
 469 void ShapeEditor::finish_drag() {
 470     if (this->nodepath && this->hit) {
 471         sp_nodepath_update_repr (this->nodepath, _("Drag curve"));
 472     }
 473 }
 474
 475 void ShapeEditor::select_rect(Geom::Rect const &rect, bool add) {
 476     if (this->nodepath) {
 477         sp_nodepath_select_rect(this->nodepath, rect, add);
 478     }
 479 }
 480
 481 bool ShapeEditor::has_selection() {
 482     if (this->nodepath)
 483         return this->nodepath->selected;
 484     return false; //  so far, knotholder cannot have selection
 485 }
 486
 487 void ShapeEditor::deselect() {
 488     if (this->nodepath)
 489         sp_nodepath_deselect(this->nodepath);
 490 }
 491
 492 void ShapeEditor::add_node () {
 493     sp_node_selected_add_node(this->nodepath);
 494 }
 495
 496 void ShapeEditor::delete_nodes () {
 497     sp_node_selected_delete(this->nodepath);
 498 }
 499
 500 void ShapeEditor::delete_nodes_preserving_shape () {
 501     if (this->nodepath && this->nodepath->selected) {
 502         sp_node_delete_preserve(g_list_copy(this->nodepath->selected));
 503     }
 504 }
 505
 506 void ShapeEditor::delete_segment () {
 507     sp_node_selected_delete_segment(this->nodepath);
 508 }
 509
 510 void ShapeEditor::set_node_type(int type) {
 511     sp_node_selected_set_type(this->nodepath, (Inkscape::NodePath::NodeType) type);
 512 }
 513
 514 void ShapeEditor::break_at_nodes() {
 515     sp_node_selected_break(this->nodepath);
 516 }
 517
 518 void ShapeEditor::join_nodes() {
 519     sp_node_selected_join(this->nodepath);
 520 }
 521
 522 void ShapeEditor::join_segments() {
 523     sp_node_selected_join_segment(this->nodepath);
 524 }
 525
 526 void ShapeEditor::duplicate_nodes() {
 527     sp_node_selected_duplicate(this->nodepath);
 528 }
 529
 530 void ShapeEditor::set_type_of_segments(NRPathcode code) {
 531     sp_node_selected_set_line_type(this->nodepath, code);
 532 }
 533
 534 void ShapeEditor::move_nodes_screen(SPDesktop *desktop, gdouble dx, gdouble dy) {
 535     sp_node_selected_move_screen(desktop, this->nodepath, dx, dy);
 536 }
 537 void ShapeEditor::move_nodes(gdouble dx, gdouble dy) {
 538     sp_node_selected_move(this->nodepath, dx, dy);
 539 }
 540
 541 void ShapeEditor::rotate_nodes(gdouble angle, int which, bool screen) {
 542     if (this->nodepath)
 543         sp_nodepath_selected_nodes_rotate (this->nodepath, angle, which, screen);
 544 }
 545
 546 void ShapeEditor::scale_nodes(gdouble const grow, int const which) {
 547     sp_nodepath_selected_nodes_scale(this->nodepath, grow, which);
 548 }
 549 void ShapeEditor::scale_nodes_screen(gdouble const grow, int const which) {
 550     sp_nodepath_selected_nodes_scale_screen(this->nodepath, grow, which);
 551 }
 552
 553 void ShapeEditor::select_all (bool invert) {
 554     if (this->nodepath)
 555         sp_nodepath_select_all (this->nodepath, invert);
 556 }
 557 void ShapeEditor::select_all_from_subpath (bool invert) {
 558     if (this->nodepath)
 559         sp_nodepath_select_all_from_subpath (this->nodepath, invert);
 560 }
 561 void ShapeEditor::select_next () {
 562     if (this->nodepath) {
 563         sp_nodepath_select_next (this->nodepath);
 564         if (this->nodepath->numSelected() >= 1) {
 565             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 566         }
 567     }
 568 }
 569 void ShapeEditor::select_prev () {
 570     if (this->nodepath) {
 571         sp_nodepath_select_prev (this->nodepath);
 572         if (this->nodepath->numSelected() >= 1) {
 573             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 574         }
 575     }
 576 }
 577
 578 void ShapeEditor::show_handles (bool show) {
 579     if (this->nodepath && !this->nodepath->straight_path)
 580         sp_nodepath_show_handles (this->nodepath, show);
 581 }
 582
 583 void ShapeEditor::show_helperpath (bool show) {
 584     if (this->nodepath)
 585         sp_nodepath_show_helperpath (this->nodepath, show);
 586 }
 587
 588 void ShapeEditor::flip (Geom::Dim2 axis, boost::optional<Geom::Point> center) {
 589     if (this->nodepath)
 590         sp_nodepath_flip (this->nodepath, axis, center);
 591 }
 592
 593 void ShapeEditor::distribute (Geom::Dim2 axis) {
 594     if (this->nodepath)
 595         sp_nodepath_selected_distribute (this->nodepath, axis);
 596 }
 597 void ShapeEditor::align (Geom::Dim2 axis) {
 598     if (this->nodepath)
 599         sp_nodepath_selected_align (this->nodepath, axis);
 600 }
 601
 602
 603 /*
 604   Local Variables:
 605   mode:c++
 606   c-file-style:"stroustrup"
 607   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 608   indent-tabs-mode:nil
 609   fill-column:99
 610   End:
 611 */
 612 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :