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