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/point.h"
  26 #include "nodepath.h"
  27 #include "xml/node-event-vector.h"
  28 #include "preferences.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     this->listener_attached_for = NULL;
  57 }
  58
  59 ShapeEditor::~ShapeEditor() {
  60     unset_item(SH_KNOTHOLDER);
  61     unset_item(SH_NODEPATH);
  62 }
  63
  64 void ShapeEditor::unset_item(SubType type, bool keep_knotholder) {
  65     Inkscape::XML::Node *old_repr = NULL;
  66
  67     switch (type) {
  68         case SH_NODEPATH:
  69             if (this->nodepath) {
  70                 old_repr = this->nodepath->repr;
  71                 if (old_repr && old_repr == listener_attached_for) {
  72                     sp_repr_remove_listener_by_data(old_repr, this);
  73                     Inkscape::GC::release(old_repr);
  74                     listener_attached_for = NULL;
  75                 }
  76
  77                 this->grab_node = -1;
  78                 delete this->nodepath;
  79                 this->nodepath = NULL;
  80             }
  81             break;
  82         case SH_KNOTHOLDER:
  83             if (this->knotholder) {
  84                 old_repr = this->knotholder->repr;
  85                 if (old_repr && old_repr == listener_attached_for) {
  86                     sp_repr_remove_listener_by_data(old_repr, this);
  87                     Inkscape::GC::release(old_repr);
  88                     listener_attached_for = NULL;
  89                 }
  90
  91                 if (!keep_knotholder) {
  92                     delete this->knotholder;
  93                     this->knotholder = NULL;
  94                 }
  95             }
  96             break;
  97     }
  98 }
  99
 100 bool ShapeEditor::has_nodepath () {
 101     return (this->nodepath != NULL);
 102 }
 103
 104 bool ShapeEditor::has_knotholder () {
 105     return (this->knotholder != NULL);
 106 }
 107
 108 void ShapeEditor::update_knotholder () {
 109     if (this->knotholder)
 110         this->knotholder->update_knots();
 111 }
 112
 113 bool ShapeEditor::has_local_change (SubType type) {
 114     switch (type) {
 115         case SH_NODEPATH:
 116             return (this->nodepath && this->nodepath->local_change);
 117         case SH_KNOTHOLDER:
 118             return (this->knotholder && this->knotholder->local_change != 0);
 119         default:
 120             g_assert_not_reached();
 121     }
 122 }
 123
 124 void ShapeEditor::decrement_local_change (SubType type) {
 125     switch (type) {
 126         case SH_NODEPATH:
 127             if (this->nodepath && this->nodepath->local_change > 0) {
 128                 this->nodepath->local_change--;
 129             }
 130             break;
 131         case SH_KNOTHOLDER:
 132             if (this->knotholder) {
 133                 this->knotholder->local_change = FALSE;
 134             }
 135             break;
 136         default:
 137             g_assert_not_reached();
 138     }
 139 }
 140
 141 const SPItem *ShapeEditor::get_item (SubType type) {
 142     const SPItem *item = NULL;
 143     switch (type) {
 144         case SH_NODEPATH:
 145             if (this->has_nodepath()) {
 146                 item = this->nodepath->item;
 147             }
 148             break;
 149         case SH_KNOTHOLDER:
 150             if (this->has_knotholder()) {
 151                 item = this->knotholder->getItem();
 152             }
 153             break;
 154     }
 155     return item;
 156 }
 157
 158 GList *ShapeEditor::save_nodepath_selection () {
 159     if (this->nodepath)
 160         return ::save_nodepath_selection (this->nodepath);
 161     return NULL;
 162 }
 163
 164 void ShapeEditor::restore_nodepath_selection (GList *saved) {
 165     if (this->nodepath && saved)
 166         ::restore_nodepath_selection (this->nodepath, saved);
 167 }
 168
 169 bool ShapeEditor::nodepath_edits_repr_key(gchar const *name) {
 170     if (nodepath && name) {
 171         return ( !strcmp(name, nodepath->repr_key) || !strcmp(name, nodepath->repr_nodetypes_key) );
 172     }
 173
 174     return false;
 175 }
 176
 177 static void shapeeditor_event_attr_changed(Inkscape::XML::Node */*repr*/, gchar const *name,
 178                                            gchar const */*old_value*/, gchar const */*new_value*/,
 179                                            bool /*is_interactive*/, gpointer data)
 180 {
 181     gboolean changed_np = FALSE;
 182     gboolean changed_kh = FALSE;
 183
 184     g_assert(data);
 185     ShapeEditor *sh = ((ShapeEditor *) data);
 186
 187     if (sh->has_nodepath() && sh->nodepath_edits_repr_key(name))
 188     {
 189         changed_np = !sh->has_local_change(SH_NODEPATH);
 190         sh->decrement_local_change(SH_NODEPATH);
 191
 192     }
 193
 194     if (changed_np) {
 195         GList *saved = NULL;
 196         if (sh->has_nodepath()) {
 197             saved = sh->save_nodepath_selection();
 198         }
 199
 200         sh->reset_item(SH_NODEPATH);
 201
 202         if (sh->has_nodepath() && saved) {
 203             sh->restore_nodepath_selection(saved);
 204             g_list_free (saved);
 205         }
 206     }
 207
 208
 209     if (sh->has_knotholder())
 210     {
 211         changed_kh = !sh->has_local_change(SH_KNOTHOLDER);
 212         sh->decrement_local_change(SH_KNOTHOLDER);
 213         if (changed_kh) {
 214             // this can happen if an LPEItem's knotholder handle was dragged, in which case we want
 215             // to keep the knotholder; in all other cases (e.g., if the LPE itself changes) we delete it
 216             sh->reset_item(SH_KNOTHOLDER, !strcmp(name, "d"));
 217         }
 218     }
 219
 220     sh->update_statusbar(); //TODO: sh->get_container()->update_statusbar();
 221 }
 222
 223 static Inkscape::XML::NodeEventVector shapeeditor_repr_events = {
 224     NULL, /* child_added */
 225     NULL, /* child_removed */
 226     shapeeditor_event_attr_changed,
 227     NULL, /* content_changed */
 228     NULL  /* order_changed */
 229 };
 230
 231
 232 void ShapeEditor::set_item(SPItem *item, SubType type, bool keep_knotholder) {
 233     // this happens (and should only happen) when for an LPEItem having both knotholder and nodepath the knotholder
 234     // is adapted; in this case we don't want to delete the knotholder since this freezes the handles
 235     unset_item(type, keep_knotholder);
 236
 237     this->grab_node = -1;
 238
 239     if (item) {
 240         Inkscape::XML::Node *repr;
 241         switch(type) {
 242             case SH_NODEPATH:
 243                 if (SP_IS_LPE_ITEM(item)) {
 244                     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 245                     this->nodepath = sp_nodepath_new(desktop, item, (prefs->getBool("/tools/nodes/show_handles", true)));
 246                 }
 247                 if (this->nodepath) {
 248                     this->nodepath->shape_editor = this;
 249
 250                     // setting new listener
 251                     repr = SP_OBJECT_REPR(item);
 252                     if (repr != listener_attached_for) {
 253                         Inkscape::GC::anchor(repr);
 254                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 255                         listener_attached_for = repr;
 256                     }
 257                 }
 258                 break;
 259
 260             case SH_KNOTHOLDER:
 261                 if (!this->knotholder) {
 262                     // only recreate knotholder if none is present
 263                     this->knotholder = sp_item_knot_holder(item, desktop);
 264                 }
 265                 if (this->knotholder) {
 266                     this->knotholder->update_knots();
 267                     // setting new listener
 268                     repr = this->knotholder->repr;
 269                     if (repr != listener_attached_for) {
 270                         Inkscape::GC::anchor(repr);
 271                         sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 272                         listener_attached_for = repr;
 273                     }
 274                 }
 275                 break;
 276         }
 277     }
 278 }
 279
 280 /** Please note that this function only works for path parameters.
 281 *  All other parameters probably will crash Inkscape!
 282 */
 283 void ShapeEditor::set_item_lpe_path_parameter(SPItem *item, SPObject *lpeobject, const char * key)
 284 {
 285     unset_item(SH_NODEPATH);
 286
 287     this->grab_node = -1;
 288
 289     if (lpeobject) {
 290         Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 291         this->nodepath = sp_nodepath_new( desktop, lpeobject,
 292                                           (prefs->getInt("/tools/nodes/show_handles", true)),
 293                                           key, item);
 294         if (this->nodepath) {
 295             this->nodepath->shape_editor = this;
 296
 297             // setting new listener
 298             Inkscape::XML::Node *repr = SP_OBJECT_REPR(lpeobject);
 299             if (repr && repr != listener_attached_for) {
 300                 Inkscape::GC::anchor(repr);
 301                 sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 302                 listener_attached_for = repr;
 303             }
 304         }
 305     }
 306 }
 307
 308 /**
 309 *  pass a new knotholder to ShapeEditor to manage (and delete)
 310 */
 311 void
 312 ShapeEditor::set_knotholder(KnotHolder * knot_holder)
 313 {
 314     unset_item(SH_KNOTHOLDER);
 315
 316     this->grab_node = -1;
 317
 318     if (knot_holder) {
 319         this->knotholder = knot_holder;
 320     }
 321 }
 322
 323
 324 /** FIXME: think about this. Is this thing only called when the item needs to be updated?
 325    Why not make a reload function in NodePath and in KnotHolder? */
 326 void ShapeEditor::reset_item (SubType type, bool keep_knotholder)
 327 {
 328     switch (type) {
 329         case SH_NODEPATH:
 330             if ( (this->nodepath) && (IS_LIVEPATHEFFECT(this->nodepath->object)) ) {
 331                 SPItem * item = this->nodepath->item;
 332                 SPObject *obj = this->nodepath->object;
 333                 char * key = g_strdup(this->nodepath->repr_key);
 334                 set_item_lpe_path_parameter(item, obj, key); // the above checks for nodepath, so it is indeed a path that we are editing
 335                 g_free(key);
 336             } else {
 337                 SPItem * item = (SPItem *) get_item(SH_NODEPATH);
 338                 set_item(item, SH_NODEPATH);
 339             }
 340             break;
 341         case SH_KNOTHOLDER:
 342             if (this->knotholder) {
 343                 SPItem * item = (SPItem *) get_item(SH_KNOTHOLDER);
 344                 set_item(item, SH_KNOTHOLDER, keep_knotholder);
 345             }
 346             break;
 347     }
 348 }
 349
 350 void ShapeEditor::nodepath_destroyed () {
 351     this->nodepath = NULL;
 352 }
 353
 354 void ShapeEditor::update_statusbar () {
 355     if (this->nodepath)
 356         sp_nodepath_update_statusbar(this->nodepath);
 357 }
 358
 359 bool ShapeEditor::is_over_stroke (Geom::Point event_p, bool remember) {
 360     if (!this->nodepath)
 361         return false; // no stroke in knotholder
 362
 363     const SPItem *item = get_item(SH_NODEPATH);
 364
 365     //Translate click point into proper coord system
 366     this->curvepoint_doc = desktop->w2d(event_p);
 367     this->curvepoint_doc *= sp_item_dt2i_affine(item);
 368
 369     SPCurve *curve = this->nodepath->curve;   // not sure if np->curve is always up to date...
 370     Geom::PathVector const &pathv = curve->get_pathvector();
 371     boost::optional<Geom::PathVectorPosition> pvpos = Geom::nearestPoint(pathv, this->curvepoint_doc);
 372     if (!pvpos) {
 373         g_print("Warning! Possible error?\n");
 374         return false;
 375     }
 376
 377     Geom::Point nearest = pathv[pvpos->path_nr].pointAt(pvpos->t);
 378     Geom::Point delta = nearest - this->curvepoint_doc;
 379
 380     delta = desktop->d2w(delta);
 381
 382     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 383     double stroke_tolerance =
 384         (( !SP_OBJECT_STYLE(item)->stroke.isNone() ?
 385            desktop->current_zoom() *
 386            SP_OBJECT_STYLE (item)->stroke_width.computed * 0.5 *
 387            to_2geom(sp_item_i2d_affine(item)).descrim()
 388          : 0.0)
 389          + prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100)) / to_2geom(sp_item_i2d_affine(item)).descrim();
 390     bool close = (Geom::L2 (delta) < stroke_tolerance);
 391
 392     if (remember && close) {
 393         // calculate index for nodepath's representation.
 394         double int_part;
 395         double t = std::modf(pvpos->t, &int_part);
 396         unsigned int segment_index = (unsigned int)int_part + 1;
 397         for (unsigned int i = 0; i < pvpos->path_nr; ++i) {
 398             segment_index += pathv[i].size() + 1;
 399             if (pathv[i].closed())
 400                 segment_index += 1;
 401         }
 402
 403         this->curvepoint_event[Geom::X] = (gint) event_p [Geom::X];
 404         this->curvepoint_event[Geom::Y] = (gint) event_p [Geom::Y];
 405         this->hit = true;
 406         this->grab_t = t;
 407         this->grab_node = segment_index;
 408     }
 409
 410     return close;
 411 }
 412
 413 void ShapeEditor::add_node_near_point() {
 414     if (this->nodepath) {
 415         sp_nodepath_add_node_near_point(this->nodepath, this->curvepoint_doc);
 416     } else if (this->knotholder) {
 417         // we do not add nodes in knotholder... yet
 418     }
 419 }
 420
 421 void ShapeEditor::select_segment_near_point(bool toggle) {
 422     if (this->nodepath) {
 423         sp_nodepath_select_segment_near_point(this->nodepath, this->curvepoint_doc, toggle);
 424     }
 425     if (this->knotholder) {
 426         // we do not select segments in knotholder... yet?
 427     }
 428 }
 429
 430 void ShapeEditor::cancel_hit() {
 431     this->hit = false;
 432 }
 433
 434 bool ShapeEditor::hits_curve() {
 435     return (this->hit);
 436 }
 437
 438
 439 void ShapeEditor::curve_drag(gdouble eventx, gdouble eventy) {
 440     if (this->nodepath && !this->nodepath->straight_path) {
 441
 442         if (this->grab_node == -1) // don't know which segment to drag
 443             return;
 444
 445         // We round off the extra precision in the motion coordinates provided
 446         // by some input devices (like tablets). As we'll store the coordinates
 447         // as integers in curvepoint_event we need to do this rounding before
 448         // comparing them with the last coordinates from curvepoint_event.
 449         // See bug #1593499 for details.
 450
 451         gint x = (gint) Inkscape::round(eventx);
 452         gint y = (gint) Inkscape::round(eventy);
 453
 454
 455         // The coordinates hasn't changed since the last motion event, abort
 456         if (this->curvepoint_event[Geom::X] == x &&
 457             this->curvepoint_event[Geom::Y] == y)
 458             return;
 459
 460         Geom::Point const delta_w(eventx - this->curvepoint_event[Geom::X],
 461                                   eventy - this->curvepoint_event[Geom::Y]);
 462         Geom::Point const delta_dt(this->desktop->w2d(delta_w));
 463
 464         sp_nodepath_curve_drag (this->nodepath, this->grab_node, this->grab_t, delta_dt);
 465         this->curvepoint_event[Geom::X] = x;
 466         this->curvepoint_event[Geom::Y] = y;
 467
 468     }
 469     if (this->knotholder) {
 470         // we do not drag curve in knotholder
 471     }
 472
 473 }
 474
 475 void ShapeEditor::finish_drag() {
 476     if (this->nodepath && this->hit) {
 477         sp_nodepath_update_repr (this->nodepath, _("Drag curve"));
 478     }
 479 }
 480
 481 void ShapeEditor::select_rect(Geom::Rect const &rect, bool add) {
 482     if (this->nodepath) {
 483         sp_nodepath_select_rect(this->nodepath, rect, add);
 484     }
 485 }
 486
 487 bool ShapeEditor::has_selection() {
 488     if (this->nodepath)
 489         return this->nodepath->selected;
 490     return false; //  so far, knotholder cannot have selection
 491 }
 492
 493 void ShapeEditor::deselect() {
 494     if (this->nodepath)
 495         sp_nodepath_deselect(this->nodepath);
 496 }
 497
 498 void ShapeEditor::add_node () {
 499     sp_node_selected_add_node(this->nodepath);
 500 }
 501
 502 void ShapeEditor::delete_nodes () {
 503     sp_node_selected_delete(this->nodepath);
 504 }
 505
 506 void ShapeEditor::delete_nodes_preserving_shape () {
 507     if (this->nodepath && this->nodepath->selected) {
 508         sp_node_delete_preserve(g_list_copy(this->nodepath->selected));
 509     }
 510 }
 511
 512 void ShapeEditor::delete_segment () {
 513     sp_node_selected_delete_segment(this->nodepath);
 514 }
 515
 516 void ShapeEditor::set_node_type(int type) {
 517     sp_node_selected_set_type(this->nodepath, (Inkscape::NodePath::NodeType) type);
 518 }
 519
 520 void ShapeEditor::break_at_nodes() {
 521     sp_node_selected_break(this->nodepath);
 522 }
 523
 524 void ShapeEditor::join_nodes() {
 525     sp_node_selected_join(this->nodepath);
 526 }
 527
 528 void ShapeEditor::join_segments() {
 529     sp_node_selected_join_segment(this->nodepath);
 530 }
 531
 532 void ShapeEditor::duplicate_nodes() {
 533     sp_node_selected_duplicate(this->nodepath);
 534 }
 535
 536 void ShapeEditor::set_type_of_segments(NRPathcode code) {
 537     sp_node_selected_set_line_type(this->nodepath, code);
 538 }
 539
 540 void ShapeEditor::move_nodes_screen(SPDesktop *desktop, gdouble dx, gdouble dy) {
 541     sp_node_selected_move_screen(desktop, this->nodepath, dx, dy);
 542 }
 543 void ShapeEditor::move_nodes(gdouble dx, gdouble dy) {
 544     sp_node_selected_move(this->nodepath, dx, dy);
 545 }
 546
 547 void ShapeEditor::rotate_nodes(gdouble angle, int which, bool screen) {
 548     if (this->nodepath)
 549         sp_nodepath_selected_nodes_rotate (this->nodepath, angle, which, screen);
 550 }
 551
 552 void ShapeEditor::scale_nodes(gdouble const grow, int const which) {
 553     sp_nodepath_selected_nodes_scale(this->nodepath, grow, which);
 554 }
 555 void ShapeEditor::scale_nodes_screen(gdouble const grow, int const which) {
 556     sp_nodepath_selected_nodes_scale_screen(this->nodepath, grow, which);
 557 }
 558
 559 void ShapeEditor::select_all (bool invert) {
 560     if (this->nodepath)
 561         sp_nodepath_select_all (this->nodepath, invert);
 562 }
 563 void ShapeEditor::select_all_from_subpath (bool invert) {
 564     if (this->nodepath)
 565         sp_nodepath_select_all_from_subpath (this->nodepath, invert);
 566 }
 567 void ShapeEditor::select_next () {
 568     if (this->nodepath) {
 569         sp_nodepath_select_next (this->nodepath);
 570         if (this->nodepath->numSelected() >= 1) {
 571             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 572         }
 573     }
 574 }
 575 void ShapeEditor::select_prev () {
 576     if (this->nodepath) {
 577         sp_nodepath_select_prev (this->nodepath);
 578         if (this->nodepath->numSelected() >= 1) {
 579             this->desktop->scroll_to_point(this->nodepath->singleSelectedCoords(), 1.0);
 580         }
 581     }
 582 }
 583
 584 void ShapeEditor::show_handles (bool show) {
 585     if (this->nodepath && !this->nodepath->straight_path)
 586         sp_nodepath_show_handles (this->nodepath, show);
 587 }
 588
 589 void ShapeEditor::show_helperpath (bool show) {
 590     if (this->nodepath)
 591         sp_nodepath_show_helperpath (this->nodepath, show);
 592 }
 593
 594 void ShapeEditor::flip (Geom::Dim2 axis, boost::optional<Geom::Point> center) {
 595     if (this->nodepath)
 596         sp_nodepath_flip (this->nodepath, axis, center);
 597 }
 598
 599 void ShapeEditor::distribute (Geom::Dim2 axis) {
 600     if (this->nodepath)
 601         sp_nodepath_selected_distribute (this->nodepath, axis);
 602 }
 603 void ShapeEditor::align (Geom::Dim2 axis) {
 604     if (this->nodepath)
 605         sp_nodepath_selected_align (this->nodepath, axis);
 606 }
 607
 608
 609 /*
 610   Local Variables:
 611   mode:c++
 612   c-file-style:"stroustrup"
 613   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 614   indent-tabs-mode:nil
 615   fill-column:99
 616   End:
 617 */
 618 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :