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  *
  10  * Copyright (C) 1999-2004 Authors
  11  * Copyright (C) 2001-2002 Ximian, Inc.
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #ifdef HAVE_CONFIG_H
  17 # include <config.h>
  18 #endif
  19 #include "xml/repr.h"
  20 #include "svg/svg.h"
  21 #include "display/curve.h"
  22 #include <glib/gmem.h>
  23 #include <glibmm/i18n.h>
  24 #include "sp-path.h"
  25 #include "sp-text.h"
  26 #include "sp-flowtext.h"
  27 #include "libnr/nr-path.h"
  28 #include "text-editing.h"
  29 #include "style.h"
  30 #include "inkscape.h"
  31 #include "desktop.h"
  32 #include "document.h"
  33 #include "message-stack.h"
  34 #include "selection.h"
  35 #include "desktop-handles.h"
  36
  37 #include "path-chemistry.h"
  38
  39 /* Helper functions for sp_selected_path_to_curves */
  40 static void sp_selected_path_to_curves0(gboolean do_document_done, guint32 text_grouping_policy);
  41 enum {
  42     /* Not used yet. This is the placeholder of Lauris's idea. */
  43     SP_TOCURVE_INTERACTIVE       = 1 << 0,
  44     SP_TOCURVE_GROUPING_BY_WORD  = 1 << 1,
  45     SP_TOCURVE_GROUPING_BY_LINE  = 1 << 2,
  46     SP_TOCURVE_GROUPING_BY_WHOLE = 1 << 3
  47 };
  48
  49 void
  50 sp_selected_path_combine(void)
  51 {
  52     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
  53
  54     Inkscape::Selection *selection = sp_desktop_selection(desktop);
  55     GSList *items = (GSList *) selection->itemList();
  56
  57     if (g_slist_length(items) < 2) {
  58         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>at least two objects</b> to combine."));
  59         return;
  60     }
  61
  62     for (GSList *i = items; i != NULL; i = i->next) {
  63         SPItem *item = (SPItem *) i->data;
  64         if (!SP_IS_SHAPE(item) && !SP_IS_TEXT(item)) {
  65             sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("At least one of the objects is <b>not a path</b>, cannot combine."));
  66             return;
  67         }
  68     }
  69
  70     Inkscape::XML::Node *parent = SP_OBJECT_REPR((SPItem *) items->data)->parent();
  71     for (GSList *i = items; i != NULL; i = i->next) {
  72         if ( SP_OBJECT_REPR((SPItem *) i->data)->parent() != parent ) {
  73             sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("You cannot combine objects from <b>different groups</b> or <b>layers</b>."));
  74             return;
  75         }
  76     }
  77
  78     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Combining paths..."));
  79     // set "busy" cursor
  80     desktop->setWaitingCursor();
  81
  82     sp_selected_path_to_curves0(FALSE, 0);
  83
  84     items = g_slist_copy((GSList *) selection->itemList());
  85     items = g_slist_sort(items, (GCompareFunc) sp_item_repr_compare_position);
  86     selection->clear();
  87
  88     // remember the position of the topmost object
  89     gint topmost = (SP_OBJECT_REPR((SPItem *) g_slist_last(items)->data))->position();
  90
  91     // remember the id of the bottomost object
  92     char const *id = SP_OBJECT_REPR((SPItem *) items->data)->attribute("id");
  93
  94     // FIXME: merge styles of combined objects instead of using the first one's style
  95     gchar *style = g_strdup(SP_OBJECT_REPR((SPItem *) items->data)->attribute("style"));
  96
  97     GString *dstring = g_string_new("");
  98     for (GSList *i = items; i != NULL; i = i->next) {
  99
 100         SPPath *path = (SPPath *) i->data;
 101         SPCurve *c = sp_shape_get_curve(SP_SHAPE(path));
 102
 103         NArtBpath *abp = nr_artpath_affine(SP_CURVE_BPATH(c), SP_ITEM(path)->transform);
 104         sp_curve_unref(c);
 105         gchar *str = sp_svg_write_path(abp);
 106         g_free(abp);
 107
 108         dstring = g_string_append(dstring, str);
 109         g_free(str);
 110
 111         // if this is the bottommost object,
 112         if (!strcmp(SP_OBJECT_REPR(path)->attribute("id"), id)) {
 113             // delete it so that its clones don't get alerted; this object will be restored shortly, with the same id
 114             SP_OBJECT(path)->deleteObject(false);
 115         } else {
 116             // delete the object for real, so that its clones can take appropriate action
 117             SP_OBJECT(path)->deleteObject();
 118         }
 119
 120         topmost--;
 121     }
 122
 123     g_slist_free(items);
 124
 125     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 126     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 127
 128     // restore id
 129     repr->setAttribute("id", id);
 130
 131     repr->setAttribute("style", style);
 132     g_free(style);
 133
 134     repr->setAttribute("d", dstring->str);
 135     g_string_free(dstring, TRUE);
 136
 137     // add the new group to the group members' common parent
 138     parent->appendChild(repr);
 139
 140     // move to the position of the topmost, reduced by the number of deleted items
 141     repr->setPosition(topmost > 0 ? topmost + 1 : 0);
 142
 143     desktop->clearWaitingCursor();
 144
 145     sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_COMBINE,
 146                          _("Combine"));
 147
 148     selection->set(repr);
 149
 150     Inkscape::GC::release(repr);
 151 }
 152
 153 void
 154 sp_selected_path_break_apart(void)
 155 {
 156     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
 157
 158     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 159
 160     if (selection->isEmpty()) {
 161         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to break apart."));
 162         return;
 163     }
 164
 165     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Breaking apart paths..."));
 166     // set "busy" cursor
 167     desktop->setWaitingCursor();
 168
 169     bool did = false;
 170
 171     for (GSList *items = g_slist_copy((GSList *) selection->itemList());
 172          items != NULL;
 173          items = items->next) {
 174
 175         SPItem *item = (SPItem *) items->data;
 176
 177         if (!SP_IS_PATH(item))
 178             continue;
 179
 180         SPPath *path = SP_PATH(item);
 181
 182         SPCurve *curve = sp_shape_get_curve(SP_SHAPE(path));
 183         if (curve == NULL)
 184             continue;
 185
 186         did = true;
 187
 188         Inkscape::XML::Node *parent = SP_OBJECT_REPR(item)->parent();
 189         gint pos = SP_OBJECT_REPR(item)->position();
 190         char const *id = SP_OBJECT_REPR(item)->attribute("id");
 191
 192         gchar *style = g_strdup(SP_OBJECT(item)->repr->attribute("style"));
 193
 194         NArtBpath *abp = nr_artpath_affine(SP_CURVE_BPATH(curve), (SP_ITEM(path))->transform);
 195
 196         sp_curve_unref(curve);
 197
 198         // it's going to resurrect as one of the pieces, so we delete without advertisement
 199         SP_OBJECT(item)->deleteObject(false);
 200
 201         curve = sp_curve_new_from_bpath(abp);
 202         g_assert(curve != NULL);
 203
 204         GSList *list = sp_curve_split(curve);
 205
 206         sp_curve_unref(curve);
 207
 208         GSList *reprs = NULL;
 209         for (GSList *l = list; l != NULL; l = l->next) {
 210             curve = (SPCurve *) l->data;
 211
 212             Inkscape::XML::Node *repr = parent->document()->createElement("svg:path");
 213             repr->setAttribute("style", style);
 214
 215             gchar *str = sp_svg_write_path(SP_CURVE_BPATH(curve));
 216             repr->setAttribute("d", str);
 217             g_free(str);
 218
 219             // add the new repr to the parent
 220             parent->appendChild(repr);
 221
 222             // move to the saved position
 223             repr->setPosition(pos > 0 ? pos : 0);
 224
 225             // if it's the first one, restore id
 226             if (l == list)
 227                 repr->setAttribute("id", id);
 228
 229             reprs = g_slist_prepend (reprs, repr);
 230
 231             Inkscape::GC::release(repr);
 232         }
 233
 234         selection->setReprList(reprs);
 235
 236         g_slist_free(reprs);
 237         g_slist_free(list);
 238         g_free(style);
 239
 240     }
 241
 242     desktop->clearWaitingCursor();
 243
 244     if (did) {
 245         sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_BREAK_APART,
 246                          _("Break apart"));
 247     } else {
 248         sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No path(s)</b> to break apart in the selection."));
 249         return;
 250     }
 251 }
 252
 253 /* This function is an entry point from GUI */
 254 void
 255 sp_selected_path_to_curves(void)
 256 {
 257     sp_selected_path_to_curves0(TRUE, SP_TOCURVE_INTERACTIVE);
 258 }
 259
 260 static void
 261 sp_selected_path_to_curves0(gboolean interactive, guint32 text_grouping_policy)
 262 {
 263     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
 264
 265     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 266
 267     if (selection->isEmpty()) {
 268         if (interactive)
 269             sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>object(s)</b> to convert to path."));
 270         return;
 271     }
 272
 273     bool did = false;
 274     if (interactive) {
 275         desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Converting objects to paths..."));
 276         // set "busy" cursor
 277         desktop->setWaitingCursor();
 278     }
 279
 280     GSList *selected = g_slist_copy((GSList *) selection->itemList());
 281     GSList *to_select = NULL;
 282     selection->clear();
 283     GSList *items = g_slist_copy(selected);
 284
 285     for (;
 286          items != NULL;
 287          items = items->next) {
 288
 289         SPItem *item = SP_ITEM(items->data);
 290
 291         if (SP_IS_PATH(item) && !SP_PATH(item)->original_curve) {
 292             continue; // already a path, and no path effect
 293         }
 294
 295         Inkscape::XML::Node *repr = sp_selected_item_to_curved_repr(item, 0);
 296         if (!repr)
 297             continue;
 298
 299         did = true;
 300         selected = g_slist_remove (selected, item);
 301
 302         // remember the position of the item
 303         gint pos = SP_OBJECT_REPR(item)->position();
 304         // remember parent
 305         Inkscape::XML::Node *parent = SP_OBJECT_REPR(item)->parent();
 306         // remember id
 307         char const *id = SP_OBJECT_REPR(item)->attribute("id");
 308
 309         // It's going to resurrect, so we delete without notifying listeners.
 310         SP_OBJECT(item)->deleteObject(false);
 311
 312         // restore id
 313         repr->setAttribute("id", id);
 314         // add the new repr to the parent
 315         parent->appendChild(repr);
 316         // move to the saved position
 317         repr->setPosition(pos > 0 ? pos : 0);
 318
 319         /* Buglet: We don't re-add the (new version of the) object to the selection of any other
 320          * desktops where it was previously selected. */
 321         to_select = g_slist_prepend (to_select, repr);
 322         Inkscape::GC::release(repr);
 323     }
 324
 325     g_slist_free (items);
 326     selection->setReprList(to_select);
 327     selection->addList(selected);
 328     g_slist_free (to_select);
 329     g_slist_free (selected);
 330
 331     if (interactive) {
 332         desktop->clearWaitingCursor();
 333         if (did) {
 334             sp_document_done(sp_desktop_document(desktop), SP_VERB_OBJECT_TO_CURVE,
 335                              _("Object to path"));
 336         } else {
 337             sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No objects</b> to convert to path in the selection."));
 338             return;
 339         }
 340     }
 341 }
 342
 343 Inkscape::XML::Node *
 344 sp_selected_item_to_curved_repr(SPItem *item, guint32 text_grouping_policy)
 345 {
 346     if (!item)
 347         return NULL;
 348
 349     SPCurve *curve = NULL;
 350     if (SP_IS_SHAPE(item)) {
 351         curve = sp_shape_get_curve(SP_SHAPE(item));
 352     } else if (SP_IS_TEXT(item) || SP_IS_FLOWTEXT(item)) {
 353         curve = te_get_layout(item)->convertToCurves();
 354     }
 355
 356     if (!curve)
 357         return NULL;
 358
 359     Inkscape::XML::Document *xml_doc = SP_OBJECT_REPR(item)->document();
 360     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 361     /* Transformation */
 362     repr->setAttribute("transform", SP_OBJECT_REPR(item)->attribute("transform"));
 363     /* Style */
 364     gchar *style_str = sp_style_write_difference(SP_OBJECT_STYLE(item),
 365                                                  SP_OBJECT_STYLE(SP_OBJECT_PARENT(item)));
 366     repr->setAttribute("style", style_str);
 367     g_free(style_str);
 368
 369     /* Mask */
 370     gchar *mask_str = (gchar *) SP_OBJECT_REPR(item)->attribute("mask");
 371     if ( mask_str )
 372         repr->setAttribute("mask", mask_str);
 373
 374     /* Clip path */
 375     gchar *clip_path_str = (gchar *) SP_OBJECT_REPR(item)->attribute("clip-path");
 376     if ( clip_path_str )
 377         repr->setAttribute("clip-path", clip_path_str);
 378
 379     /* Rotation center */
 380     sp_repr_set_attr(repr, "inkscape:transform-center-x", SP_OBJECT_REPR(item)->attribute("inkscape:transform-center-x"));
 381     sp_repr_set_attr(repr, "inkscape:transform-center-y", SP_OBJECT_REPR(item)->attribute("inkscape:transform-center-y"));
 382
 383     /* Definition */
 384     gchar *def_str = sp_svg_write_path(SP_CURVE_BPATH(curve));
 385     repr->setAttribute("d", def_str);
 386     g_free(def_str);
 387     sp_curve_unref(curve);
 388     return repr;
 389 }
 390
 391 void
 392 sp_selected_path_reverse()
 393 {
 394     SPDesktop *desktop = SP_ACTIVE_DESKTOP;
 395
 396     Inkscape::Selection *selection = sp_desktop_selection(desktop);
 397     GSList *items = (GSList *) selection->itemList();
 398
 399     if (!items) {
 400         sp_desktop_message_stack(desktop)->flash(Inkscape::WARNING_MESSAGE, _("Select <b>path(s)</b> to reverse."));
 401         return;
 402     }
 403
 404
 405     // set "busy" cursor
 406     desktop->setWaitingCursor();
 407
 408     bool did = false;
 409     desktop->messageStack()->flash(Inkscape::IMMEDIATE_MESSAGE, _("Reversing paths..."));
 410
 411     for (GSList *i = items; i != NULL; i = i->next) {
 412
 413         if (!SP_IS_SHAPE(i->data))
 414             continue;
 415
 416         did = true;
 417         SPShape *shape = SP_SHAPE(i->data);
 418
 419         SPCurve *rcurve = sp_curve_reverse(shape->curve);
 420
 421         gchar *str = sp_svg_write_path(SP_CURVE_BPATH(rcurve));
 422         SP_OBJECT_REPR(shape)->setAttribute("d", str);
 423         g_free(str);
 424
 425         sp_curve_unref(rcurve);
 426     }
 427
 428     desktop->clearWaitingCursor();
 429
 430     if (did) {
 431         sp_document_done(sp_desktop_document(desktop), SP_VERB_SELECTION_REVERSE,
 432                          _("Reverse path"));
 433     } else {
 434         sp_desktop_message_stack(desktop)->flash(Inkscape::ERROR_MESSAGE, _("<b>No paths</b> to reverse in the selection."));
 435     }
 436 }
 437
 438 /*
 439   Local Variables:
 440   mode:c++
 441   c-file-style:"stroustrup"
 442   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 443   indent-tabs-mode:nil
 444   fill-column:99
 445   End:
 446 */
 447 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :