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