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