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 "desktop-handles.h"
  24 #include "knotholder.h"
  25 #include "live_effects/parameter/pointparam-knotholder.h"
  26 #include "node-context.h"
  27 #include "xml/node-event-vector.h"
  28 #include "prefs-utils.h"
  29 #include "object-edit.h"
  30 #include "style.h"
  31 #include "display/curve.h"
  32 #include <2geom/pathvector.h>
  33
  34 #include "shape-editor.h"
  35
  36
  37 ShapeEditorsCollective::ShapeEditorsCollective(SPDesktop */*dt*/) {
  38 }
  39
  40 ShapeEditorsCollective::~ShapeEditorsCollective() {
  41 }
  42
  43
  44 void ShapeEditorsCollective::update_statusbar() {
  45
  46 //!!! move from nodepath: sp_nodepath_update_statusbar but summing for all nodepaths
  47
  48 }
  49
  50 ShapeEditor::ShapeEditor(SPDesktop *dt) {
  51     this->desktop = dt;
  52     this->grab_node = -1;
  53     this->nodepath = NULL;
  54     this->knotholder = NULL;
  55     this->hit = false;
  56 }
  57
  58 ShapeEditor::~ShapeEditor() {
  59     unset_item(SH_KNOTHOLDER);
  60     unset_item(SH_NODEPATH);
  61 }
  62
  63 void ShapeEditor::unset_item(SubType type, bool keep_knotholder) {
  64     Inkscape::XML::Node *old_repr = NULL;
  65
  66     switch (type) {
  67         case SH_NODEPATH:
  68             if (this->nodepath) {
  69                 old_repr = this->nodepath->repr;
  70                 sp_repr_remove_listener_by_data(old_repr, this);
  71                 Inkscape::GC::release(old_repr);
  72
  73                 this->grab_node = -1;
  74                 sp_nodepath_destroy(this->nodepath);
  75                 this->nodepath = NULL;
  76             }
  77             break;
  78         case SH_KNOTHOLDER:
  79             if (this->knotholder) {
  80                 old_repr = this->knotholder->repr;
  81                 sp_repr_remove_listener_by_data(old_repr, this);
  82                 Inkscape::GC::release(old_repr);
  83
  84                 if (!keep_knotholder) {
  85                     delete this->knotholder;
  86                     this->knotholder = NULL;
  87                 }
  88             }
  89             break;
  90     }
  91 }
  92
  93 bool ShapeEditor::has_nodepath () {
  94     return (this->nodepath != NULL);
  95 }
  96
  97 bool ShapeEditor::has_knotholder () {
  98     return (this->knotholder != NULL);
  99 }
 100
 101 void ShapeEditor::update_knotholder () {
 102     if (this->knotholder)
 103         this->knotholder->update_knots();
 104 }
 105
 106 bool ShapeEditor::has_local_change (SubType type) {
 107     switch (type) {
 108         case SH_NODEPATH:
 109             return (this->nodepath && this->nodepath->local_change);
 110         case SH_KNOTHOLDER:
 111             return (this->knotholder && this->knotholder->local_change != 0);
 112         default:
 113             g_assert_not_reached();
 114     }
 115 }
 116
 117 void ShapeEditor::decrement_local_change (SubType type) {
 118     switch (type) {
 119         case SH_NODEPATH:
 120             if (this->nodepath && this->nodepath->local_change > 0) {
 121                 this->nodepath->local_change--;
 122             }
 123             break;
 124         case SH_KNOTHOLDER:
 125             if (this->knotholder) {
 126                 this->knotholder->local_change = FALSE;
 127             }
 128             break;
 129         default:
 130             g_assert_not_reached();
 131     }
 132 }
 133
 134 const SPItem *ShapeEditor::get_item (SubType type) {
 135     const SPItem *item = NULL;
 136     switch (type) {
 137         case SH_NODEPATH:
 138             if (this->has_nodepath()) {
 139                 item = this->nodepath->item;
 140             }
 141             break;
 142         case SH_KNOTHOLDER:
 143             if (this->has_knotholder()) {
 144                 item = this->knotholder->getItem();
 145             }
 146             break;
 147     }
 148     return item;
 149 }
 150
 151 GList *ShapeEditor::save_nodepath_selection () {
 152     if (this->nodepath)
 153         return ::save_nodepath_selection (this->nodepath);
 154     return NULL;
 155 }
 156
 157 void ShapeEditor::restore_nodepath_selection (GList *saved) {
 158     if (this->nodepath && saved)
 159         ::restore_nodepath_selection (this->nodepath, saved);
 160 }
 161
 162 bool ShapeEditor::nodepath_edits_repr_key(gchar const *name) {
 163     if (nodepath && name) {
 164         return ( !strcmp(name, nodepath->repr_key) || !strcmp(name, nodepath->repr_nodetypes_key) );
 165     }
 166
 167     return false;
 168 }
 169
 170 static void shapeeditor_event_attr_changed(Inkscape::XML::Node */*repr*/, gchar const *name,
 171                                            gchar const */*old_value*/, gchar const */*new_value*/,
 172                                            bool /*is_interactive*/, gpointer data)
 173 {
 174     gboolean changed_np = FALSE;
 175     gboolean changed_kh = FALSE;
 176
 177     g_assert(data);
 178     ShapeEditor *sh = ((ShapeEditor *) data);
 179
 180     if (sh->has_nodepath() && sh->nodepath_edits_repr_key(name))
 181     {
 182         changed_np = !sh->has_local_change(SH_NODEPATH);
 183         sh->decrement_local_change(SH_NODEPATH);
 184
 185     }
 186
 187     if (changed_np) {
 188         GList *saved = NULL;
 189         if (sh->has_nodepath()) {
 190             saved = sh->save_nodepath_selection();
 191         }
 192
 193         sh->reset_item(SH_NODEPATH);
 194
 195         if (sh->has_nodepath() && saved) {
 196             sh->restore_nodepath_selection(saved);
 197             g_list_free (saved);
 198         }
 199     }
 200
 201
 202     if (sh->has_knotholder())
 203     {
 204         changed_kh = !sh->has_local_change(SH_KNOTHOLDER);
 205         sh->decrement_local_change(SH_KNOTHOLDER);
 206         if (changed_kh) {
 207             // this can happen if an LPEItem's knotholder handle was dragged, in which case we want
 208             // to keep the knotholder; in all other cases (e.g., if the LPE itself changes) we delete it
 209             sh->reset_item(SH_KNOTHOLDER, !strcmp(name, "d"));
 210         }
 211     }
 212
 213     sh->update_statusbar(); //TODO: sh->get_container()->update_statusbar();
 214 }
 215
 216 static Inkscape::XML::NodeEventVector shapeeditor_repr_events = {
 217     NULL, /* child_added */
 218     NULL, /* child_removed */
 219     shapeeditor_event_attr_changed,
 220     NULL, /* content_changed */
 221     NULL  /* order_changed */
 222 };
 223
 224
 225 void ShapeEditor::set_item(SPItem *item, SubType type, bool keep_knotholder) {
 226     // this happens (and should only happen) when for an LPEItem having both knotholder and nodepath the knotholder
 227     // is adapted; in this case we don't want to delete the knotholder since this freezes the handles
 228     unset_item(type, keep_knotholder);
 229
 230     this->grab_node = -1;
 231
 232     if (item) {
 233         Inkscape::XML::Node *repr;
 234         switch(type) {
 235             case SH_NODEPATH:
 236                 if (SP_IS_LPE_ITEM(item)) {
 237                     //SPLPEItem *lpeitem = SP_LPE_ITEM(item);
 238                     //Inkscape::LivePathEffect::Effect *lpe = sp_lpe_item_get_current_lpe(lpeitem);
 239                     //if (!(lpe && lpe->isVisible() && lpe->providesKnotholder())) {
 240                         // only create nodepath if the item either doesn't have an LPE
 241                         // or the LPE is invisible or it doesn't provide a knotholder itself
 242                         this->nodepath = sp_nodepath_new(desktop, item,
 243                                                          (prefs_get_int_attribute("tools.nodes", "show_handles", 1) != 0));
 244                     //} else if (lpe && lpe->isVisible()) {
 245                     //    sp_lpe_item_add_temporary_canvasitems(lpeitem, desktop);
 246                     //}
 247                 }
 248                 if (this->nodepath) {
 249                     this->nodepath->shape_editor = this;
 250
 251                     // setting new listener
 252                     repr = SP_OBJECT_REPR(item);
 253                     Inkscape::GC::anchor(repr);
 254                     sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 255                 }
 256                 break;
 257
 258             case SH_KNOTHOLDER:
 259                 if (!this->knotholder) {
 260                     // only recreate knotholder if none is present
 261                     this->knotholder = sp_item_knot_holder(item, desktop);
 262                 }
 263                 if (this->knotholder) {
 264                     this->knotholder->update_knots();
 265                     // setting new listener
 266                     repr = this->knotholder->repr;
 267                     Inkscape::GC::anchor(repr);
 268                     sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 269                 }
 270                 break;
 271         }
 272     }
 273 }
 274
 275 /** Please note that this function only works for path parameters.
 276 *  All other parameters probably will crash Inkscape!
 277 */
 278 void ShapeEditor::set_item_lpe_path_parameter(SPItem *item, SPObject *lpeobject, const char * key)
 279 {
 280     unset_item(SH_NODEPATH);
 281
 282     this->grab_node = -1;
 283
 284     if (lpeobject) {
 285         this->nodepath = sp_nodepath_new( desktop, lpeobject,
 286                                           (prefs_get_int_attribute("tools.nodes", "show_handles", 1) != 0),
 287                                           key, item);
 288         if (this->nodepath) {
 289             this->nodepath->shape_editor = this;
 290
 291             // setting new listener
 292             Inkscape::XML::Node *repr = SP_OBJECT_REPR(lpeobject);
 293             if (repr) {
 294                 Inkscape::GC::anchor(repr);
 295                 sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 296             }
 297         }
 298     }
 299 }
 300
 301 /**
 302 *  pass a new knotholder to ShapeEditor to manage (and delete)
 303 */
 304 void
 305 ShapeEditor::set_knotholder(KnotHolder * knot_holder)
 306 {
 307     unset_item(SH_KNOTHOLDER);
 308
 309     this->grab_node = -1;
 310
 311     if (knot_holder) {
 312         this->knotholder = knot_holder;
 313     }
 314 }
 315
 316
 317 /** FIXME: think about this. Is this thing only called when the item needs to be updated?
 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 ( (this->nodepath) && (IS_LIVEPATHEFFECT(this->nodepath->object)) ) {
 324                 SPItem * item = this->nodepath->item;
 325                 SPObject *obj = this->nodepath->object;
 326                 char * key = g_strdup(this->nodepath->repr_key);
 327                 set_item_lpe_path_parameter(item, obj, key); // the above checks for nodepath, so it is indeed a path that we are editing
 328                 g_free(key);
 329             } else {
 330                 SPItem * item = (SPItem *) get_item(SH_NODEPATH);
 331                 set_item(item, SH_NODEPATH);
 332             }
 333             break;
 334         case SH_KNOTHOLDER:
 335             if (this->knotholder) {
 336                 SPItem * item = (SPItem *) get_item(SH_KNOTHOLDER);
 337                 set_item(item, SH_KNOTHOLDER, keep_knotholder);
 338             }
 339             break;
 340     }
 341 }
 342
 343 void ShapeEditor::nodepath_destroyed () {
 344     this->nodepath = NULL;
 345 }
 346
 347 void ShapeEditor::update_statusbar () {
 348     if (this->nodepath)
 349         sp_nodepath_update_statusbar(this->nodepath);
 350 }
 351
 352 bool ShapeEditor::is_over_stroke (NR::Point event_p, bool remember) {
 353
 354     if (!this->nodepath)
 355         return false; // no stroke in knotholder
 356
 357     const SPItem *item = get_item(SH_NODEPATH);
 358
 359     //Translate click point into proper coord system
 360     this->curvepoint_doc = desktop->w2d(event_p);
 361     this->curvepoint_doc *= from_2geom(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     Geom::PathVectorPosition pvpos = Geom::nearestPoint(pathv, this->curvepoint_doc);
 366
 367     NR::Point nearest = pathv[pvpos.path_nr].pointAt(pvpos.t);
 368     NR::Point delta = nearest - this->curvepoint_doc;
 369
 370     delta = desktop->d2w(delta);
 371
 372     double stroke_tolerance =
 373         (( !SP_OBJECT_STYLE(item)->stroke.isNone() ?
 374            desktop->current_zoom() *
 375            SP_OBJECT_STYLE (item)->stroke_width.computed * 0.5 *
 376            NR::expansion(from_2geom(sp_item_i2d_affine(item)))
 377          : 0.0)
 378          + prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100)) /NR::expansion(from_2geom(sp_item_i2d_affine(item)));
 379     bool close = (NR::L2 (delta) < stroke_tolerance);
 380
 381     if (remember && close) {
 382         // calculate index for nodepath's representation.
 383         double int_part;
 384         double t = std::modf(pvpos.t, &int_part);
 385         unsigned int segment_index = (unsigned int)int_part + 1;
 386         for (unsigned int i = 0; i < pvpos.path_nr; ++i) {
 387             segment_index += pathv[i].size() + 1;
 388             if (pathv[i].closed())
 389                 segment_index += 1;
 390         }
 391
 392         this->curvepoint_event[NR::X] = (gint) event_p [NR::X];
 393         this->curvepoint_event[NR::Y] = (gint) event_p [NR::Y];
 394         this->hit = true;
 395         this->grab_t = t;
 396         this->grab_node = segment_index;
 397     }
 398
 399     return close;
 400 }
 401
 402 void ShapeEditor::add_node_near_point() {
 403     if (this->nodepath) {
 404         sp_nodepath_add_node_near_point(this->nodepath, this->curvepoint_doc);
 405     } else if (this->knotholder) {
 406         // we do not add nodes in knotholder... yet
 407     }
 408 }
 409
 410 void ShapeEditor::select_segment_near_point(bool toggle) {
 411     if (this->nodepath) {
 412         sp_nodepath_select_segment_near_point(this->nodepath, this->curvepoint_doc, toggle);
 413     }
 414     if (this->knotholder) {
 415         // we do not select segments in knotholder... yet?
 416     }
 417 }
 418
 419 void ShapeEditor::cancel_hit() {
 420     this->hit = false;
 421 }
 422
 423 bool ShapeEditor::hits_curve() {
 424     return (this->hit);
 425 }
 426
 427
 428 void ShapeEditor::curve_drag(gdouble eventx, gdouble eventy) {
 429     if (this->nodepath && !this->nodepath->straight_path) {
 430
 431         if (this->grab_node == -1) // don't know which segment to drag
 432             return;
 433
 434         // We round off the extra precision in the motion coordinates provided
 435         // by some input devices (like tablets). As we'll store the coordinates
 436         // as integers in curvepoint_event we need to do this rounding before
 437         // comparing them with the last coordinates from curvepoint_event.
 438         // See bug #1593499 for details.
 439
 440         gint x = (gint) Inkscape::round(eventx);
 441         gint y = (gint) Inkscape::round(eventy);
 442
 443
 444         // The coordinates hasn't changed since the last motion event, abort
 445         if (this->curvepoint_event[NR::X] == x &&
 446             this->curvepoint_event[NR::Y] == y)
 447             return;
 448
 449         NR::Point const delta_w(eventx - this->curvepoint_event[NR::X],
 450                                 eventy - this->curvepoint_event[NR::Y]);
 451         NR::Point const delta_dt(this->desktop->w2d(delta_w));
 452
 453         sp_nodepath_curve_drag (this->grab_node, this->grab_t, delta_dt); //!!! FIXME: which nodepath?!!! also uses current!!!
 454         this->curvepoint_event[NR::X] = x;
 455         this->curvepoint_event[NR::Y] = y;
 456
 457     }
 458     if (this->knotholder) {
 459         // we do not drag curve in knotholder
 460     }
 461
 462 }
 463
 464 void ShapeEditor::finish_drag() {
 465     if (this->nodepath && this->hit) {
 466         sp_nodepath_update_repr (this->nodepath, _("Drag curve"));
 467     }
 468 }
 469
 470 void ShapeEditor::select_rect(NR::Rect const &rect, bool add) {
 471     if (this->nodepath) {
 472         sp_nodepath_select_rect(this->nodepath, rect, add);
 473     }
 474 }
 475
 476 bool ShapeEditor::has_selection() {
 477     if (this->nodepath)
 478         return this->nodepath->selected;
 479     return false; //  so far, knotholder cannot have selection
 480 }
 481
 482 void ShapeEditor::deselect() {
 483     if (this->nodepath)
 484         sp_nodepath_deselect(this->nodepath);
 485 }
 486
 487 void ShapeEditor::add_node () {
 488     sp_node_selected_add_node(this->nodepath);
 489 }
 490
 491 void ShapeEditor::delete_nodes () {
 492     sp_node_selected_delete(this->nodepath);
 493 }
 494
 495 void ShapeEditor::delete_nodes_preserving_shape () {
 496     if (this->nodepath && this->nodepath->selected) {
 497         sp_node_delete_preserve(g_list_copy(this->nodepath->selected));
 498     }
 499 }
 500
 501 void ShapeEditor::delete_segment () {
 502     sp_node_selected_delete_segment(this->nodepath);
 503 }
 504
 505 void ShapeEditor::set_node_type(int type) {
 506     sp_node_selected_set_type(this->nodepath, (Inkscape::NodePath::NodeType) type);
 507 }
 508
 509 void ShapeEditor::break_at_nodes() {
 510     sp_node_selected_break(this->nodepath);
 511 }
 512
 513 void ShapeEditor::join_nodes() {
 514     sp_node_selected_join(this->nodepath);
 515 }
 516
 517 void ShapeEditor::join_segments() {
 518     sp_node_selected_join_segment(this->nodepath);
 519 }
 520
 521 void ShapeEditor::duplicate_nodes() {
 522     sp_node_selected_duplicate(this->nodepath);
 523 }
 524
 525 void ShapeEditor::set_type_of_segments(NRPathcode code) {
 526     sp_node_selected_set_line_type(this->nodepath, code);
 527 }
 528
 529 void ShapeEditor::move_nodes_screen(gdouble dx, gdouble dy) {
 530     sp_node_selected_move_screen(this->nodepath, dx, dy);
 531 }
 532 void ShapeEditor::move_nodes(gdouble dx, gdouble dy) {
 533     sp_node_selected_move(this->nodepath, dx, dy);
 534 }
 535
 536 void ShapeEditor::rotate_nodes(gdouble angle, int which, bool screen) {
 537     if (this->nodepath)
 538         sp_nodepath_selected_nodes_rotate (this->nodepath, angle, which, screen);
 539 }
 540
 541 void ShapeEditor::scale_nodes(gdouble const grow, int const which) {
 542     sp_nodepath_selected_nodes_scale(this->nodepath, grow, which);
 543 }
 544 void ShapeEditor::scale_nodes_screen(gdouble const grow, int const which) {
 545     sp_nodepath_selected_nodes_scale_screen(this->nodepath, grow, which);
 546 }
 547
 548 void ShapeEditor::select_all (bool invert) {
 549     if (this->nodepath)
 550         sp_nodepath_select_all (this->nodepath, invert);
 551 }
 552 void ShapeEditor::select_all_from_subpath (bool invert) {
 553     if (this->nodepath)
 554         sp_nodepath_select_all_from_subpath (this->nodepath, invert);
 555 }
 556 void ShapeEditor::select_next () {
 557     if (this->nodepath) {
 558         sp_nodepath_select_next (this->nodepath);
 559         if (this->nodepath->numSelected() >= 1) {
 560             this->desktop->scroll_to_point(&(this->nodepath->singleSelectedCoords()), 1.0);
 561         }
 562     }
 563 }
 564 void ShapeEditor::select_prev () {
 565     if (this->nodepath) {
 566         sp_nodepath_select_prev (this->nodepath);
 567         if (this->nodepath->numSelected() >= 1) {
 568             this->desktop->scroll_to_point(&(this->nodepath->singleSelectedCoords()), 1.0);
 569         }
 570     }
 571 }
 572
 573 void ShapeEditor::show_handles (bool show) {
 574     if (this->nodepath && !this->nodepath->straight_path)
 575         sp_nodepath_show_handles (this->nodepath, show);
 576 }
 577
 578 void ShapeEditor::show_helperpath (bool show) {
 579     if (this->nodepath)
 580         sp_nodepath_show_helperpath (this->nodepath, show);
 581 }
 582
 583 void ShapeEditor::flip (NR::Dim2 axis, NR::Maybe<NR::Point> center) {
 584     if (this->nodepath)
 585         sp_nodepath_flip (this->nodepath, axis, center);
 586 }
 587
 588 void ShapeEditor::distribute (NR::Dim2 axis) {
 589     if (this->nodepath)
 590         sp_nodepath_selected_distribute (this->nodepath, axis);
 591 }
 592 void ShapeEditor::align (NR::Dim2 axis) {
 593     if (this->nodepath)
 594         sp_nodepath_selected_align (this->nodepath, axis);
 595 }
 596
 597
 598 /*
 599   Local Variables:
 600   mode:c++
 601   c-file-style:"stroustrup"
 602   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 603   indent-tabs-mode:nil
 604   fill-column:99
 605   End:
 606 */
 607 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :