src/path-chemistry.cpp

   1 #define __SP_PATH_CHEMISTRY_C__
   2
   3 /*
   4  * Here are handlers for modifying selections, specific to paths
   5  *
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *   Jasper van de Gronde <th.v.d.gronde@hccnet.nl>
  10  *
  11  * Copyright (C) 1999-2008 Authors
  12  * Copyright (C) 2001-2002 Ximian, Inc.
  13  *
  14  * Released under GNU GPL, read the file 'COPYING' for more information
  15  */
  16
  17 #ifdef HAVE_CONFIG_H
  18 # include <config.h>
  19 #endif
  20 #include <cstring>
  21 #include <string>
  22 #include "xml/repr.h"
  23 #include "svg/svg.h"
  24 #include "display/curve.h"
  25 #include <glib/gmem.h>
  26 #include <glibmm/i18n.h>
  27 #include "sp-path.h"
  28 #include "sp-text.h"
  29 #include "sp-flowtext.h"
  30 #include "libnr/nr-path.h"
  31 #include "text-editing.h"
  32 #include "style.h"
  33 #include "desktop.h"
  34 #include "document.h"
  35 #include "message-stack.h"
  36 #include "selection.h"
  37 #include "desktop-handles.h"
  38 #include "box3d.h"
  39 #include <2geom/pathvector.h>
  40 #include "path-chemistry.h"
  41
  42 /* Helper functions for sp_selected_path_to_curves */
  43 static void sp_selected_path_to_curves0(SPDesktop *desktop, bool do_document_done, guint32 text_grouping_policy);
  44 static bool sp_item_list_to_curves(const GSList *items, GSList **selected, GSList **to_select);
  45
  46 enum {
  47     /* Not used yet. This is the placeholder of Lauris's idea. */
  48     SP_TOCURVE_INTERACTIVE       = 1 << 0,
  49     SP_TOCURVE_GROUPING_BY_WORD  = 1 << 1,
  50     SP_TOCURVE_GROUPING_BY_LINE  = 1 << 2,
  51     SP_TOCURVE_GROUPING_BY_WHOLE = 1 << 3
  52 };
  53
  54 void
  55 sp_selected_path_combine(SPDesktop *desktop)
  56 {
  57     Inkscape::Selection *selection = sp_desktop_selection(desktop);
  58     SPDocument *doc = sp_desktop_document(desktop);
  59
  60     if (g_slist_length((GSList *) selection->itemList()) < 2) {
  61         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>at least two objects</b> to combine."));
  62         return;
  63     }
  64
  65     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Combining paths..."));
  66     // set "busy" cursor
  67     desktop->setWaitingCursor();
  68
  69     GSList *items = g_slist_copy((GSList *) selection->itemList());
  70     GSList *to_paths = NULL;
  71     for (GSList *i = items; i != NULL; i = i->next) {
  72         SPItem *item = (SPItem *) i->data;
  73         if (!SP_IS_PATH(item))
  74             to_paths = g_slist_prepend(to_paths, item);
  75     }
  76     GSList *converted = NULL;
  77     bool did = sp_item_list_to_curves(to_paths, &items, &converted);
  78     g_slist_free(to_paths);
  79     for (GSList *i = converted; i != NULL; i = i->next)
  80         items = g_slist_prepend(items, doc->getObjectByRepr((Inkscape::XML::Node*)(i->data)));
  81
  82     items = g_slist_sort(items, (GCompareFunc) sp_item_repr_compare_position);
  83     items = g_slist_reverse(items);
  84
  85     // remember the position, id, transform and style of the topmost path, they will be assigned to the combined one
  86     gint position = 0;
  87     char const *id = NULL;
  88     char const *transform = NULL;
  89     gchar *style = NULL;
  90     gchar *path_effect = NULL;
  91
  92     SPCurve* curve = 0;
  93     SPItem *first = NULL;
  94     Inkscape::XML::Node *parent = NULL;
  95
  96     for (GSList *i = items; i != NULL; i = i->next) {  // going from top to bottom
  97
  98         SPItem *item = (SPItem *) i->data;
  99         if (!SP_IS_PATH(item))
 100             continue;
 101         did = true;
 102
 103         SPCurve *c = sp_path_get_curve_for_edit(SP_PATH(item));
 104         if (first == NULL) {  // this is the topmost path
 105             first = item;
 106             parent = SP_OBJECT_REPR(first)->parent();
 107             position = SP_OBJECT_REPR(first)->position();
 108             id = SP_OBJECT_REPR(first)->attribute("id");
 109             transform = SP_OBJECT_REPR(first)->attribute("transform");
 110             // FIXME: merge styles of combined objects instead of using the first one's style
 111             style = g_strdup(SP_OBJECT_REPR(first)->attribute("style"));
 112             path_effect = g_strdup(SP_OBJECT_REPR(first)->attribute("inkscape:path-effect"));
 113             //c->transform(item->transform);
 114             curve = c;
 115         } else {
 116             c->transform(item->getRelativeTransform(SP_OBJECT(first)));
 117             curve->append(c, false);
 118             c->unref();
 119         }
 120
 121         // unless this is the topmost object,
 122         if (item != first) {
 123             // reduce position only if the same parent
 124             if (SP_OBJECT_REPR(item)->parent() == parent)
 125                 position--;
 126             // delete the object for real, so that its clones can take appropriate action
 127             SP_OBJECT(item)->deleteObject();
 128         }
 129     }
 130
 131     g_slist_free(items);
 132
 133     if (did) {
 134         selection->clear();
 135
 136         // delete the topmost one so that its clones don't get alerted; this object will be
 137         // restored shortly, with the same id
 138         SP_OBJECT(first)->deleteObject(false);
 139
 140         Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 141         Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 142
 143         // restore id, transform, path effect, and style
 144         repr->setAttribute("id", id);
 145         if (transform) repr->setAttribute("transform", transform);
 146         repr->setAttribute("style", style);
 147         g_free(style);
 148
 149         // set path data corresponding to new curve
 150         gchar *dstring = sp_svg_write_path(curve->get_pathvector());
 151         curve->unref();
 152         repr->setAttribute("d", dstring);
 153         if (path_effect)
 154             repr->setAttribute("inkscape:original-d", dstring);
 155         g_free(dstring);
 156
 157         repr->setAttribute("inkscape:path-effect", path_effect);
 158         g_free(path_effect);
 159
 160         // add the new group to the parent of the topmost
 161         parent->appendChild(repr);
 162
 163         // move to the position of the topmost, reduced by the number of deleted items
 164         repr->setPosition(position > 0 ? position : 0);
 165
 166         sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_COMBINE,
 167                          _("Combine"));
 168
 169         selection->set(repr);
 170
 171         Inkscape::GC::release(repr);
 172
 173     } else {
 174         sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No path(s)</b> to combine in the selection."));
 175     }
 176
 177     desktop->clearWaitingCursor();
 178 }
 179
 180 void
 181 sp_selected_path_break_apart(SPDesktop *desktop)
 182 {
 183     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 184
 185     if (selection->isEmpty()) {
 186         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to break apart."));
 187         return;
 188     }
 189
 190     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Breaking apart paths..."));
 191     // set "busy" cursor
 192     desktop->setWaitingCursor();
 193
 194     bool did = false;
 195
 196     for (GSList *items = g_slist_copy((GSList *) selection->itemList());
 197          items != NULL;
 198          items = items->next) {
 199
 200         SPItem *item = (SPItem *) items->data;
 201
 202         if (!SP_IS_PATH(item))
 203             continue;
 204
 205         SPPath *path = SP_PATH(item);
 206
 207         SPCurve *curve = sp_path_get_curve_for_edit(SP_PATH(path));
 208         if (curve == NULL)
 209             continue;
 210
 211         did = true;
 212
 213         Inkscape::XML::Node *parent = SP_OBJECT_REPR(item)->parent();
 214         gint pos = SP_OBJECT_REPR(item)->position();
 215         char const *id = SP_OBJECT_REPR(item)->attribute("id");
 216
 217         gchar *style = g_strdup(SP_OBJECT(item)->repr->attribute("style"));
 218         gchar *path_effect = g_strdup(SP_OBJECT(item)->repr->attribute("inkscape:path-effect"));
 219
 220         Geom::PathVector apv = curve->get_pathvector() * SP_ITEM(path)->transform;
 221
 222         curve->unref();
 223
 224         // it's going to resurrect as one of the pieces, so we delete without advertisement
 225         SP_OBJECT(item)->deleteObject(false);
 226
 227         curve = new SPCurve(apv);
 228         g_assert(curve != NULL);
 229
 230         GSList *list = curve->split();
 231
 232         curve->unref();
 233
 234         GSList *reprs = NULL;
 235         for (GSList *l = list; l != NULL; l = l->next) {
 236             curve = (SPCurve *) l->data;
 237
 238             Inkscape::XML::Node *repr = parent->document()->createElement("svg:path");
 239             repr->setAttribute("style", style);
 240
 241             gchar *str = sp_svg_write_path(curve->get_pathvector());
 242             repr->setAttribute("d", str);
 243             if (path_effect)
 244                 repr->setAttribute("inkscape:original-d", str);
 245             g_free(str);
 246
 247             repr->setAttribute("inkscape:path-effect", path_effect);
 248
 249             // add the new repr to the parent
 250             parent->appendChild(repr);
 251
 252             // move to the saved position
 253             repr->setPosition(pos > 0 ? pos : 0);
 254
 255             // if it's the first one, restore id
 256             if (l == list)
 257                 repr->setAttribute("id", id);
 258
 259             reprs = g_slist_prepend (reprs, repr);
 260
 261             Inkscape::GC::release(repr);
 262         }
 263
 264         selection->setReprList(reprs);
 265
 266         g_slist_free(reprs);
 267         g_slist_free(list);
 268         g_free(style);
 269
 270     }
 271
 272     desktop->clearWaitingCursor();
 273
 274     if (did) {
 275         sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_BREAK_APART,
 276                          _("Break apart"));
 277     } else {
 278         sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No path(s)</b> to break apart in the selection."));
 279     }
 280 }
 281
 282 /* This function is an entry point from GUI */
 283 void
 284 sp_selected_path_to_curves(SPDesktop *desktop, bool interactive)
 285 {
 286     sp_selected_path_to_curves0(desktop, interactive, interactive ? SP_TOCURVE_INTERACTIVE : 0);
 287 }
 288
 289 static void
 290 sp_selected_path_to_curves0(SPDesktop *desktop, bool interactive, guint32 /*text_grouping_policy*/)
 291 {
 292     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 293
 294     if (selection->isEmpty()) {
 295         if (interactive)
 296             sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to convert to path."));
 297         return;
 298     }
 299
 300     bool did = false;
 301     if (interactive) {
 302         desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Converting objects to paths..."));
 303         // set "busy" cursor
 304         desktop->setWaitingCursor();
 305     }
 306
 307     GSList *selected = g_slist_copy((GSList *) selection->itemList());
 308     GSList *to_select = NULL;
 309     selection->clear();
 310     GSList *items = g_slist_copy(selected);
 311
 312     did = sp_item_list_to_curves(items, &selected, &to_select);
 313
 314     g_slist_free (items);
 315     selection->setReprList(to_select);
 316     selection->addList(selected);
 317     g_slist_free (to_select);
 318     g_slist_free (selected);
 319
 320     if (interactive) {
 321         desktop->clearWaitingCursor();
 322         if (did) {
 323             sp_document_done(sp_desktop_document(desktop), SP_VERB_OBJECT_TO_CURVE,
 324                              _("Object to path"));
 325         } else {
 326             sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No objects</b> to convert to path in the selection."));
 327             return;
 328         }
 329     }
 330 }
 331
 332 static bool
 333 sp_item_list_to_curves(const GSList *items, GSList **selected, GSList **to_select)
 334 {
 335     bool did = false;
 336
 337     for (;
 338          items != NULL;
 339          items = items->next) {
 340
 341         SPItem *item = SP_ITEM(items->data);
 342
 343         if (SP_IS_PATH(item) && !SP_PATH(item)->original_curve) {
 344             continue; // already a path, and no path effect
 345         }
 346
 347         if (SP_IS_BOX3D(item)) {
 348             // convert 3D box to ordinary group of paths; replace the old element in 'selected' with the new group
 349             Inkscape::XML::Node *repr = SP_OBJECT_REPR(box3d_convert_to_group(SP_BOX3D(item)));
 350
 351             if (repr) {
 352                 *to_select = g_slist_prepend (*to_select, repr);
 353                 did = true;
 354                 *selected = g_slist_remove (*selected, item);
 355             }
 356
 357             continue;
 358         }
 359
 360         if (SP_IS_GROUP(item)) {
 361             sp_lpe_item_remove_all_path_effects(SP_LPE_ITEM(item), true);
 362             GSList *item_list = sp_item_group_item_list(SP_GROUP(item));
 363
 364             GSList *item_to_select = NULL;
 365             GSList *item_selected = NULL;
 366
 367             if (sp_item_list_to_curves(item_list, &item_selected, &item_to_select))
 368                 did = true;
 369
 370             g_slist_free(item_list);
 371             g_slist_free(item_to_select);
 372             g_slist_free(item_selected);
 373
 374             continue;
 375         }
 376
 377         Inkscape::XML::Node *repr = sp_selected_item_to_curved_repr(item, 0);
 378         if (!repr)
 379             continue;
 380
 381         did = true;
 382         *selected = g_slist_remove (*selected, item);
 383
 384         // remember the position of the item
 385         gint pos = SP_OBJECT_REPR(item)->position();
 386         // remember parent
 387         Inkscape::XML::Node *parent = SP_OBJECT_REPR(item)->parent();
 388         // remember id
 389         char const *id = SP_OBJECT_REPR(item)->attribute("id");
 390
 391         // It's going to resurrect, so we delete without notifying listeners.
 392         SP_OBJECT(item)->deleteObject(false);
 393
 394         // restore id
 395         repr->setAttribute("id", id);
 396         // add the new repr to the parent
 397         parent->appendChild(repr);
 398         // move to the saved position
 399         repr->setPosition(pos > 0 ? pos : 0);
 400
 401         /* Buglet: We don't re-add the (new version of the) object to the selection of any other
 402          * desktops where it was previously selected. */
 403         *to_select = g_slist_prepend (*to_select, repr);
 404         Inkscape::GC::release(repr);
 405     }
 406
 407     return did;
 408 }
 409
 410 Inkscape::XML::Node *
 411 sp_selected_item_to_curved_repr(SPItem *item, guint32 /*text_grouping_policy*/)
 412 {
 413     if (!item)
 414         return NULL;
 415
 416     SPCurve *curve = NULL;
 417     if (SP_IS_SHAPE(item)) {
 418         curve = sp_shape_get_curve(SP_SHAPE(item));
 419     } else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
 420         curve = te_get_layout(item)->convertToCurves();
 421     }
 422
 423     if (!curve)
 424         return NULL;
 425
 426     // Prevent empty paths from being added to the document
 427     // otherwise we end up with zomby markup in the SVG file
 428     if(curve->is_empty())
 429     {
 430         curve->unref();
 431         return NULL;
 432     }
 433
 434     Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(item)->document();
 435     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 436     /* Transformation */
 437     repr->setAttribute("transform", SP_OBJECT_REPR(item)->attribute("transform"));
 438     /* Style */
 439     gchar *style_str = sp_style_write_difference(SP_OBJECT_STYLE(item),
 440                                                  SP_OBJECT_STYLE(SP_OBJECT_PARENT(item)));
 441     repr->setAttribute("style", style_str);
 442     g_free(style_str);
 443
 444     /* Mask */
 445     gchar *mask_str = (gchar *) SP_OBJECT_REPR(item)->attribute("mask");
 446     if ( mask_str )
 447         repr->setAttribute("mask", mask_str);
 448
 449     /* Clip path */
 450     gchar *clip_path_str = (gchar *) SP_OBJECT_REPR(item)->attribute("clip-path");
 451     if ( clip_path_str )
 452         repr->setAttribute("clip-path", clip_path_str);
 453
 454     /* Rotation center */
 455     repr->setAttribute("inkscape:transform-center-x", SP_OBJECT_REPR(item)->attribute("inkscape:transform-center-x"), false);
 456     repr->setAttribute("inkscape:transform-center-y", SP_OBJECT_REPR(item)->attribute("inkscape:transform-center-y"), false);
 457
 458     /* Definition */
 459     gchar *def_str = sp_svg_write_path(curve->get_pathvector());
 460     repr->setAttribute("d", def_str);
 461     g_free(def_str);
 462     curve->unref();
 463     return repr;
 464 }
 465
 466
 467 // FIXME: THIS DOES NOT REVERSE THE NODETYPES ORDER!
 468 void
 469 sp_selected_path_reverse(SPDesktop *desktop)
 470 {
 471     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 472     GSList *items = (GSList *) selection->itemList();
 473
 474     if (!items) {
 475         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to reverse."));
 476         return;
 477     }
 478
 479
 480     // set "busy" cursor
 481     desktop->setWaitingCursor();
 482
 483     bool did = false;
 484     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Reversing paths..."));
 485
 486     for (GSList *i = items; i != NULL; i = i->next) {
 487
 488         if (!SP_IS_PATH(i->data))
 489             continue;
 490
 491         did = true;
 492         SPPath *path = SP_PATH(i->data);
 493
 494         SPCurve *rcurve = sp_path_get_curve_reference(path)->create_reverse();
 495
 496         gchar *str = sp_svg_write_path(rcurve->get_pathvector());
 497         if ( sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(path)) ) {
 498             SP_OBJECT_REPR(path)->setAttribute("inkscape:original-d", str);
 499         } else {
 500             SP_OBJECT_REPR(path)->setAttribute("d", str);
 501         }
 502         g_free(str);
 503
 504         rcurve->unref();
 505     }
 506
 507     desktop->clearWaitingCursor();
 508
 509     if (did) {
 510         sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_REVERSE,
 511                          _("Reverse path"));
 512     } else {
 513         sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No paths</b> to reverse in the selection."));
 514     }
 515 }
 516
 517 /*
 518   Local Variables:
 519   mode:c++
 520   c-file-style:"stroustrup"
 521   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 522   indent-tabs-mode:nil
 523   fill-column:99
 524   End:
 525 */
 526 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :