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 "splivarot.h"
  31 #include "style.h"
  32
  33 #include "shape-editor.h"
  34
  35
  36 ShapeEditorsCollective::ShapeEditorsCollective(SPDesktop */*dt*/) {
  37 }
  38
  39 ShapeEditorsCollective::~ShapeEditorsCollective() {
  40 }
  41
  42
  43 void ShapeEditorsCollective::update_statusbar() {
  44
  45 //!!! move from nodepath: sp_nodepath_update_statusbar but summing for all nodepaths
  46
  47 }
  48
  49 ShapeEditor::ShapeEditor(SPDesktop *dt) {
  50     this->desktop = dt;
  51     this->grab_node = -1;
  52     this->nodepath = NULL;
  53     this->knotholder = NULL;
  54     this->hit = false;
  55 }
  56
  57 ShapeEditor::~ShapeEditor() {
  58     unset_item(SH_KNOTHOLDER);
  59     unset_item(SH_NODEPATH);
  60 }
  61
  62 void ShapeEditor::unset_item(SubType type, bool keep_knotholder) {
  63     Inkscape::XML::Node *old_repr = NULL;
  64
  65     switch (type) {
  66         case SH_NODEPATH:
  67             if (this->nodepath) {
  68                 old_repr = this->nodepath->repr;
  69                 sp_repr_remove_listener_by_data(old_repr, this);
  70                 Inkscape::GC::release(old_repr);
  71
  72                 this->grab_node = -1;
  73                 sp_nodepath_destroy(this->nodepath);
  74                 this->nodepath = NULL;
  75             }
  76             break;
  77         case SH_KNOTHOLDER:
  78             if (this->knotholder) {
  79                 old_repr = this->knotholder->repr;
  80                 sp_repr_remove_listener_by_data(old_repr, this);
  81                 Inkscape::GC::release(old_repr);
  82
  83                 if (!keep_knotholder) {
  84                     delete this->knotholder;
  85                     this->knotholder = NULL;
  86                 }
  87             }
  88             break;
  89     }
  90 }
  91
  92 bool ShapeEditor::has_nodepath () {
  93     return (this->nodepath != NULL);
  94 }
  95
  96 bool ShapeEditor::has_knotholder () {
  97     return (this->knotholder != NULL);
  98 }
  99
 100 void ShapeEditor::update_knotholder () {
 101     if (this->knotholder)
 102         this->knotholder->update_knots();
 103 }
 104
 105 bool ShapeEditor::has_local_change (SubType type) {
 106     switch (type) {
 107         case SH_NODEPATH:
 108             return (this->nodepath && this->nodepath->local_change);
 109         case SH_KNOTHOLDER:
 110             return (this->knotholder && this->knotholder->local_change != 0);
 111         default:
 112             g_assert_not_reached();
 113     }
 114 }
 115
 116 void ShapeEditor::decrement_local_change (SubType type) {
 117     switch (type) {
 118         case SH_NODEPATH:
 119             if (this->nodepath && this->nodepath->local_change > 0) {
 120                 this->nodepath->local_change--;
 121             }
 122             break;
 123         case SH_KNOTHOLDER:
 124             if (this->knotholder) {
 125                 this->knotholder->local_change = FALSE;
 126             }
 127             break;
 128         default:
 129             g_assert_not_reached();
 130     }
 131 }
 132
 133 const SPItem *ShapeEditor::get_item (SubType type) {
 134     const SPItem *item = NULL;
 135     switch (type) {
 136         case SH_NODEPATH:
 137             if (this->has_nodepath()) {
 138                 item = this->nodepath->item;
 139             }
 140             break;
 141         case SH_KNOTHOLDER:
 142             if (this->has_knotholder()) {
 143                 item = this->knotholder->getItem();
 144             }
 145             break;
 146     }
 147     return item;
 148 }
 149
 150 GList *ShapeEditor::save_nodepath_selection () {
 151     if (this->nodepath)
 152         return ::save_nodepath_selection (this->nodepath);
 153     return NULL;
 154 }
 155
 156 void ShapeEditor::restore_nodepath_selection (GList *saved) {
 157     if (this->nodepath && saved)
 158         ::restore_nodepath_selection (this->nodepath, saved);
 159 }
 160
 161 bool ShapeEditor::nodepath_edits_repr_key(gchar const *name) {
 162     if (nodepath && name) {
 163         return ( !strcmp(name, nodepath->repr_key) || !strcmp(name, nodepath->repr_nodetypes_key) );
 164     }
 165
 166     return false;
 167 }
 168
 169 static void shapeeditor_event_attr_changed(Inkscape::XML::Node */*repr*/, gchar const *name,
 170                                            gchar const */*old_value*/, gchar const */*new_value*/,
 171                                            bool /*is_interactive*/, gpointer data)
 172 {
 173     gboolean changed_np = FALSE;
 174     gboolean changed_kh = FALSE;
 175
 176     g_assert(data);
 177     ShapeEditor *sh = ((ShapeEditor *) data);
 178
 179     if (sh->has_nodepath() && sh->nodepath_edits_repr_key(name))
 180     {
 181         changed_np = !sh->has_local_change(SH_NODEPATH);
 182         sh->decrement_local_change(SH_NODEPATH);
 183
 184     }
 185
 186     if (changed_np) {
 187         GList *saved = NULL;
 188         if (sh->has_nodepath()) {
 189             saved = sh->save_nodepath_selection();
 190         }
 191
 192         sh->reset_item(SH_NODEPATH);
 193
 194         if (sh->has_nodepath() && saved) {
 195             sh->restore_nodepath_selection(saved);
 196             g_list_free (saved);
 197         }
 198     }
 199
 200
 201     if (sh->has_knotholder())
 202     {
 203         changed_kh = !sh->has_local_change(SH_KNOTHOLDER);
 204         sh->decrement_local_change(SH_KNOTHOLDER);
 205         if (changed_kh) {
 206             // this can happen if an LPEItem's knotholder handle was dragged, in which case we want
 207             // to keep the knotholder; in all other cases (e.g., if the LPE itself changes) we delete it
 208             sh->reset_item(SH_KNOTHOLDER, !strcmp(name, "d"));
 209         }
 210     }
 211
 212     sh->update_statusbar(); //TODO: sh->get_container()->update_statusbar();
 213 }
 214
 215 static Inkscape::XML::NodeEventVector shapeeditor_repr_events = {
 216     NULL, /* child_added */
 217     NULL, /* child_removed */
 218     shapeeditor_event_attr_changed,
 219     NULL, /* content_changed */
 220     NULL  /* order_changed */
 221 };
 222
 223
 224 void ShapeEditor::set_item(SPItem *item, SubType type, bool keep_knotholder) {
 225     // this happens (and should only happen) when for an LPEItem having both knotholder and nodepath the knotholder
 226     // is adapted; in this case we don't want to delete the knotholder since this freezes the handles
 227     unset_item(type, keep_knotholder);
 228
 229     this->grab_node = -1;
 230
 231     if (item) {
 232         Inkscape::XML::Node *repr;
 233         switch(type) {
 234             case SH_NODEPATH:
 235                 if (SP_IS_LPE_ITEM(item)) {
 236                     //SPLPEItem *lpeitem = SP_LPE_ITEM(item);
 237                     //Inkscape::LivePathEffect::Effect *lpe = sp_lpe_item_get_current_lpe(lpeitem);
 238                     //if (!(lpe && lpe->isVisible() && lpe->providesKnotholder())) {
 239                         // only create nodepath if the item either doesn't have an LPE
 240                         // or the LPE is invisible or it doesn't provide a knotholder itself
 241                         this->nodepath = sp_nodepath_new(desktop, item,
 242                                                          (prefs_get_int_attribute("tools.nodes", "show_handles", 1) != 0));
 243                     //} else if (lpe && lpe->isVisible()) {
 244                     //    sp_lpe_item_add_temporary_canvasitems(lpeitem, desktop);
 245                     //}
 246                 }
 247                 if (this->nodepath) {
 248                     this->nodepath->shape_editor = this;
 249
 250                     // setting new listener
 251                     repr = SP_OBJECT_REPR(item);
 252                     Inkscape::GC::anchor(repr);
 253                     sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 254                 }
 255                 break;
 256
 257             case SH_KNOTHOLDER:
 258                 if (!this->knotholder) {
 259                     // only recreate knotholder if none is present
 260                     this->knotholder = sp_item_knot_holder(item, desktop);
 261                 }
 262                 if (this->knotholder) {
 263                     this->knotholder->update_knots();
 264                     // setting new listener
 265                     repr = this->knotholder->repr;
 266                     Inkscape::GC::anchor(repr);
 267                     sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 268                 }
 269                 break;
 270         }
 271     }
 272 }
 273
 274 /** Please note that this function only works for path parameters.
 275 *  All other parameters probably will crash Inkscape!
 276 */
 277 void ShapeEditor::set_item_lpe_path_parameter(SPItem *item, SPObject *lpeobject, const char * key)
 278 {
 279     unset_item(SH_NODEPATH);
 280
 281     this->grab_node = -1;
 282
 283     if (lpeobject) {
 284         this->nodepath = sp_nodepath_new( desktop, lpeobject,
 285                                           (prefs_get_int_attribute("tools.nodes", "show_handles", 1) != 0),
 286                                           key, item);
 287         if (this->nodepath) {
 288             this->nodepath->shape_editor = this;
 289
 290             // setting new listener
 291             Inkscape::XML::Node *repr = SP_OBJECT_REPR(lpeobject);
 292             if (repr) {
 293                 Inkscape::GC::anchor(repr);
 294                 sp_repr_add_listener(repr, &shapeeditor_repr_events, this);
 295             }
 296         }
 297     }
 298 }
 299
 300 /**
 301 *  pass a new knotholder to ShapeEditor to manage (and delete)
 302 */
 303 void
 304 ShapeEditor::set_knotholder(KnotHolder * knot_holder)
 305 {
 306     unset_item(SH_KNOTHOLDER);
 307
 308     this->grab_node = -1;
 309
 310     if (knot_holder) {
 311         this->knotholder = knot_holder;
 312     }
 313 }
 314
 315
 316 /** FIXME: think about this. Is this thing only called when the item needs to be updated?
 317    Why not make a reload function in NodePath and in KnotHolder? */
 318 void ShapeEditor::reset_item (SubType type, bool keep_knotholder)
 319 {
 320     switch (type) {
 321         case SH_NODEPATH:
 322             if ( (this->nodepath) && (IS_LIVEPATHEFFECT(this->nodepath->object)) ) {
 323                 SPItem * item = this->nodepath->item;
 324                 SPObject *obj = this->nodepath->object;
 325                 char * key = g_strdup(this->nodepath->repr_key);
 326                 set_item_lpe_path_parameter(item, obj, key); // the above checks for nodepath, so it is indeed a path that we are editing
 327                 g_free(key);
 328             } else {
 329                 SPItem * item = (SPItem *) get_item(SH_NODEPATH);
 330                 set_item(item, SH_NODEPATH);
 331             }
 332             break;
 333         case SH_KNOTHOLDER:
 334             if (this->knotholder) {
 335                 SPItem * item = (SPItem *) get_item(SH_KNOTHOLDER);
 336                 set_item(item, SH_KNOTHOLDER, keep_knotholder);
 337             }
 338             break;
 339     }
 340 }
 341
 342 void ShapeEditor::nodepath_destroyed () {
 343     this->nodepath = NULL;
 344 }
 345
 346 void ShapeEditor::update_statusbar () {
 347     if (this->nodepath)
 348         sp_nodepath_update_statusbar(this->nodepath);
 349 }
 350
 351 bool ShapeEditor::is_over_stroke (NR::Point event_p, bool remember) {
 352
 353     if (!this->nodepath)
 354         return false; // no stroke in knotholder
 355
 356     const SPItem *item = get_item(SH_NODEPATH);
 357
 358     //Translate click point into proper coord system
 359     this->curvepoint_doc = desktop->w2d(event_p);
 360     this->curvepoint_doc *= from_2geom(sp_item_dt2i_affine(item));
 361
 362     sp_nodepath_ensure_livarot_path(this->nodepath);
 363
 364     NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(this->nodepath->livarot_path, this->curvepoint_doc);
 365     if (!position) {
 366         return false;
 367     }
 368
 369     NR::Point nearest = get_point_on_Path(this->nodepath->livarot_path, position->piece, position->t);
 370     NR::Point delta = nearest - this->curvepoint_doc;
 371
 372     delta = desktop->d2w(delta);
 373
 374     double stroke_tolerance =
 375         (( !SP_OBJECT_STYLE(item)->stroke.isNone() ?
 376            desktop->current_zoom() *
 377            SP_OBJECT_STYLE (item)->stroke_width.computed * 0.5 *
 378            NR::expansion(from_2geom(sp_item_i2d_affine(item)))
 379          : 0.0)
 380          + prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100)) /NR::expansion(from_2geom(sp_item_i2d_affine(item)));
 381     bool close = (NR::L2 (delta) < stroke_tolerance);
 382
 383     if (remember && close) {
 384         this->curvepoint_event[NR::X] = (gint) event_p [NR::X];
 385         this->curvepoint_event[NR::Y] = (gint) event_p [NR::Y];
 386         this->hit = true;
 387         this->grab_t = position->t;
 388         this->grab_node = position->piece;
 389     }
 390
 391     return close;
 392 }
 393
 394 void ShapeEditor::add_node_near_point() {
 395     if (this->nodepath) {
 396         sp_nodepath_add_node_near_point(this->nodepath, this->curvepoint_doc);
 397     } else if (this->knotholder) {
 398         // we do not add nodes in knotholder... yet
 399     }
 400 }
 401
 402 void ShapeEditor::select_segment_near_point(bool toggle) {
 403     if (this->nodepath) {
 404         sp_nodepath_select_segment_near_point(this->nodepath, this->curvepoint_doc, toggle);
 405     }
 406     if (this->knotholder) {
 407         // we do not select segments in knotholder... yet?
 408     }
 409 }
 410
 411 void ShapeEditor::cancel_hit() {
 412     this->hit = false;
 413 }
 414
 415 bool ShapeEditor::hits_curve() {
 416     return (this->hit);
 417 }
 418
 419
 420 void ShapeEditor::curve_drag(gdouble eventx, gdouble eventy) {
 421     if (this->nodepath && !this->nodepath->straight_path) {
 422
 423         if (this->grab_node == -1) // don't know which segment to drag
 424             return;
 425
 426         // We round off the extra precision in the motion coordinates provided
 427         // by some input devices (like tablets). As we'll store the coordinates
 428         // as integers in curvepoint_event we need to do this rounding before
 429         // comparing them with the last coordinates from curvepoint_event.
 430         // See bug #1593499 for details.
 431
 432         gint x = (gint) Inkscape::round(eventx);
 433         gint y = (gint) Inkscape::round(eventy);
 434
 435
 436         // The coordinates hasn't changed since the last motion event, abort
 437         if (this->curvepoint_event[NR::X] == x &&
 438             this->curvepoint_event[NR::Y] == y)
 439             return;
 440
 441         NR::Point const delta_w(eventx - this->curvepoint_event[NR::X],
 442                                 eventy - this->curvepoint_event[NR::Y]);
 443         NR::Point const delta_dt(this->desktop->w2d(delta_w));
 444
 445         sp_nodepath_curve_drag (this->grab_node, this->grab_t, delta_dt); //!!! FIXME: which nodepath?!!! also uses current!!!
 446         this->curvepoint_event[NR::X] = x;
 447         this->curvepoint_event[NR::Y] = y;
 448
 449     }
 450     if (this->knotholder) {
 451         // we do not drag curve in knotholder
 452     }
 453
 454 }
 455
 456 void ShapeEditor::finish_drag() {
 457     if (this->nodepath && this->hit) {
 458         sp_nodepath_update_repr (this->nodepath, _("Drag curve"));
 459     }
 460 }
 461
 462 void ShapeEditor::select_rect(NR::Rect const &rect, bool add) {
 463     if (this->nodepath) {
 464         sp_nodepath_select_rect(this->nodepath, rect, add);
 465     }
 466 }
 467
 468 bool ShapeEditor::has_selection() {
 469     if (this->nodepath)
 470         return this->nodepath->selected;
 471     return false; //  so far, knotholder cannot have selection
 472 }
 473
 474 void ShapeEditor::deselect() {
 475     if (this->nodepath)
 476         sp_nodepath_deselect(this->nodepath);
 477 }
 478
 479 void ShapeEditor::add_node () {
 480     sp_node_selected_add_node(this->nodepath);
 481 }
 482
 483 void ShapeEditor::delete_nodes () {
 484     sp_node_selected_delete(this->nodepath);
 485 }
 486
 487 void ShapeEditor::delete_nodes_preserving_shape () {
 488     if (this->nodepath && this->nodepath->selected) {
 489         sp_node_delete_preserve(g_list_copy(this->nodepath->selected));
 490     }
 491 }
 492
 493 void ShapeEditor::delete_segment () {
 494     sp_node_selected_delete_segment(this->nodepath);
 495 }
 496
 497 void ShapeEditor::set_node_type(int type) {
 498     sp_node_selected_set_type(this->nodepath, (Inkscape::NodePath::NodeType) type);
 499 }
 500
 501 void ShapeEditor::break_at_nodes() {
 502     sp_node_selected_break(this->nodepath);
 503 }
 504
 505 void ShapeEditor::join_nodes() {
 506     sp_node_selected_join(this->nodepath);
 507 }
 508
 509 void ShapeEditor::join_segments() {
 510     sp_node_selected_join_segment(this->nodepath);
 511 }
 512
 513 void ShapeEditor::duplicate_nodes() {
 514     sp_node_selected_duplicate(this->nodepath);
 515 }
 516
 517 void ShapeEditor::set_type_of_segments(NRPathcode code) {
 518     sp_node_selected_set_line_type(this->nodepath, code);
 519 }
 520
 521 void ShapeEditor::move_nodes_screen(gdouble dx, gdouble dy) {
 522     sp_node_selected_move_screen(this->nodepath, dx, dy);
 523 }
 524 void ShapeEditor::move_nodes(gdouble dx, gdouble dy) {
 525     sp_node_selected_move(this->nodepath, dx, dy);
 526 }
 527
 528 void ShapeEditor::rotate_nodes(gdouble angle, int which, bool screen) {
 529     if (this->nodepath)
 530         sp_nodepath_selected_nodes_rotate (this->nodepath, angle, which, screen);
 531 }
 532
 533 void ShapeEditor::scale_nodes(gdouble const grow, int const which) {
 534     sp_nodepath_selected_nodes_scale(this->nodepath, grow, which);
 535 }
 536 void ShapeEditor::scale_nodes_screen(gdouble const grow, int const which) {
 537     sp_nodepath_selected_nodes_scale_screen(this->nodepath, grow, which);
 538 }
 539
 540 void ShapeEditor::select_all (bool invert) {
 541     if (this->nodepath)
 542         sp_nodepath_select_all (this->nodepath, invert);
 543 }
 544 void ShapeEditor::select_all_from_subpath (bool invert) {
 545     if (this->nodepath)
 546         sp_nodepath_select_all_from_subpath (this->nodepath, invert);
 547 }
 548 void ShapeEditor::select_next () {
 549     if (this->nodepath) {
 550         sp_nodepath_select_next (this->nodepath);
 551         if (this->nodepath->numSelected() >= 1) {
 552             this->desktop->scroll_to_point(&(this->nodepath->singleSelectedCoords()), 1.0);
 553         }
 554     }
 555 }
 556 void ShapeEditor::select_prev () {
 557     if (this->nodepath) {
 558         sp_nodepath_select_prev (this->nodepath);
 559         if (this->nodepath->numSelected() >= 1) {
 560             this->desktop->scroll_to_point(&(this->nodepath->singleSelectedCoords()), 1.0);
 561         }
 562     }
 563 }
 564
 565 void ShapeEditor::show_handles (bool show) {
 566     if (this->nodepath && !this->nodepath->straight_path)
 567         sp_nodepath_show_handles (this->nodepath, show);
 568 }
 569
 570 void ShapeEditor::show_helperpath (bool show) {
 571     if (this->nodepath)
 572         sp_nodepath_show_helperpath (this->nodepath, show);
 573 }
 574
 575 void ShapeEditor::flip (NR::Dim2 axis, NR::Maybe<NR::Point> center) {
 576     if (this->nodepath)
 577         sp_nodepath_flip (this->nodepath, axis, center);
 578 }
 579
 580 void ShapeEditor::distribute (NR::Dim2 axis) {
 581     if (this->nodepath)
 582         sp_nodepath_selected_distribute (this->nodepath, axis);
 583 }
 584 void ShapeEditor::align (NR::Dim2 axis) {
 585     if (this->nodepath)
 586         sp_nodepath_selected_align (this->nodepath, axis);
 587 }
 588
 589
 590 /*
 591   Local Variables:
 592   mode:c++
 593   c-file-style:"stroustrup"
 594   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 595   indent-tabs-mode:nil
 596   fill-column:99
 597   End:
 598 */
 599 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :