src/draw-context.cpp

   1 #define __SP_DRAW_CONTEXT_C__
   2
   3 /*
   4  * Generic drawing context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *
   9  * Copyright (C) 2000 Lauris Kaplinski
  10  * Copyright (C) 2000-2001 Ximian, Inc.
  11  * Copyright (C) 2002 Lauris Kaplinski
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #define DRAW_VERBOSE
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include "config.h"
  20 #endif
  21 #include <gdk/gdkkeysyms.h>
  22
  23 #include "display/canvas-bpath.h"
  24 #include "xml/repr.h"
  25 #include "svg/svg.h"
  26 #include <glibmm/i18n.h>
  27 #include "libnr/n-art-bpath.h"
  28 #include "display/curve.h"
  29 #include "desktop.h"
  30 #include "desktop-affine.h"
  31 #include "desktop-handles.h"
  32 #include "desktop-style.h"
  33 #include "document.h"
  34 #include "draw-anchor.h"
  35 #include "macros.h"
  36 #include "message-stack.h"
  37 #include "pen-context.h"
  38 #include "prefs-utils.h"
  39 #include "selection.h"
  40 #include "selection-chemistry.h"
  41 #include "snap.h"
  42 #include "sp-path.h"
  43 #include "sp-namedview.h"
  44
  45 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  46 static void sp_draw_context_init(SPDrawContext *dc);
  47 static void sp_draw_context_dispose(GObject *object);
  48
  49 static void sp_draw_context_setup(SPEventContext *ec);
  50 static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value);
  51 static void sp_draw_context_finish(SPEventContext *ec);
  52
  53 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  54
  55 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  56 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  57
  58 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  59
  60 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  61
  62 static void spdc_reset_white(SPDrawContext *dc);
  63 static void spdc_free_colors(SPDrawContext *dc);
  64
  65
  66 static SPEventContextClass *draw_parent_class;
  67
  68
  69 GType
  70 sp_draw_context_get_type(void)
  71 {
  72     static GType type = 0;
  73     if (!type) {
  74         GTypeInfo info = {
  75             sizeof(SPDrawContextClass),
  76             NULL, NULL,
  77             (GClassInitFunc) sp_draw_context_class_init,
  78             NULL, NULL,
  79             sizeof(SPDrawContext),
  80             4,
  81             (GInstanceInitFunc) sp_draw_context_init,
  82             NULL,   /* value_table */
  83         };
  84         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  85     }
  86     return type;
  87 }
  88
  89 static void
  90 sp_draw_context_class_init(SPDrawContextClass *klass)
  91 {
  92     GObjectClass *object_class;
  93     SPEventContextClass *ec_class;
  94
  95     object_class = (GObjectClass *)klass;
  96     ec_class = (SPEventContextClass *) klass;
  97
  98     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
  99
 100     object_class->dispose = sp_draw_context_dispose;
 101
 102     ec_class->setup = sp_draw_context_setup;
 103     ec_class->set = sp_draw_context_set;
 104     ec_class->finish = sp_draw_context_finish;
 105     ec_class->root_handler = sp_draw_context_root_handler;
 106 }
 107
 108 static void
 109 sp_draw_context_init(SPDrawContext *dc)
 110 {
 111     dc->attach = FALSE;
 112
 113     dc->red_color = 0xff00007f;
 114     dc->blue_color = 0x0000ff7f;
 115     dc->green_color = 0x00ff007f;
 116     dc->red_curve_is_valid = false;
 117
 118     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 119
 120     new (&dc->sel_changed_connection) sigc::connection();
 121     new (&dc->sel_modified_connection) sigc::connection();
 122 }
 123
 124 static void
 125 sp_draw_context_dispose(GObject *object)
 126 {
 127     SPDrawContext *dc = SP_DRAW_CONTEXT(object);
 128
 129     dc->sel_changed_connection.~connection();
 130     dc->sel_modified_connection.~connection();
 131
 132     if (dc->grab) {
 133         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 134         dc->grab = NULL;
 135     }
 136
 137     if (dc->selection) {
 138         dc->selection = NULL;
 139     }
 140
 141     spdc_free_colors(dc);
 142
 143     G_OBJECT_CLASS(draw_parent_class)->dispose(object);
 144 }
 145
 146 static void
 147 sp_draw_context_setup(SPEventContext *ec)
 148 {
 149     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 150     SPDesktop *dt = ec->desktop;
 151
 152     if (((SPEventContextClass *) draw_parent_class)->setup) {
 153         ((SPEventContextClass *) draw_parent_class)->setup(ec);
 154     }
 155
 156     dc->selection = sp_desktop_selection(dt);
 157
 158     /* Connect signals to track selection changes */
 159     dc->sel_changed_connection = dc->selection->connectChanged(
 160         sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc)
 161     );
 162     dc->sel_modified_connection = dc->selection->connectModified(
 163         sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc)
 164     );
 165
 166     /* Create red bpath */
 167     dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 168     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 169     /* Create red curve */
 170     dc->red_curve = new SPCurve(4);
 171
 172     /* Create blue bpath */
 173     dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 174     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 175     /* Create blue curve */
 176     dc->blue_curve = new SPCurve(8);
 177
 178     /* Create green curve */
 179     dc->green_curve = new SPCurve(64);
 180     /* No green anchor by default */
 181     dc->green_anchor = NULL;
 182     dc->green_closed = FALSE;
 183
 184     dc->attach = TRUE;
 185     spdc_attach_selection(dc, dc->selection);
 186 }
 187
 188 static void
 189 sp_draw_context_finish(SPEventContext *ec)
 190 {
 191     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 192
 193     dc->sel_changed_connection.disconnect();
 194     dc->sel_modified_connection.disconnect();
 195
 196     if (dc->grab) {
 197         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 198     }
 199
 200     if (dc->selection) {
 201         dc->selection = NULL;
 202     }
 203
 204     spdc_free_colors(dc);
 205 }
 206
 207 static void
 208 sp_draw_context_set(SPEventContext */*ec*/, const gchar */*key*/, const gchar */*value*/)
 209 {
 210 }
 211
 212 gint
 213 sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event)
 214 {
 215     gint ret = FALSE;
 216
 217     switch (event->type) {
 218         case GDK_KEY_PRESS:
 219             switch (get_group0_keyval (&event->key)) {
 220                 case GDK_Up:
 221                 case GDK_Down:
 222                 case GDK_KP_Up:
 223                 case GDK_KP_Down:
 224                     // prevent the zoom field from activation
 225                     if (!MOD__CTRL_ONLY) {
 226                         ret = TRUE;
 227                     }
 228                     break;
 229                 default:
 230             break;
 231         }
 232         break;
 233     default:
 234         break;
 235     }
 236
 237     if (!ret) {
 238         if (((SPEventContextClass *) draw_parent_class)->root_handler) {
 239             ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event);
 240         }
 241     }
 242
 243     return ret;
 244 }
 245
 246 /*
 247  * If we have an item and a waiting LPE, apply the effect to the item
 248  * (spiro spline mode is treated separately)
 249  */
 250 void
 251 spdc_check_for_and_apply_waiting_LPE(SPDrawContext *dc, SPItem *item)
 252 {
 253     using namespace Inkscape::LivePathEffect;
 254
 255     if (item) {
 256         if (prefs_get_int_attribute("tools.freehand", "spiro-spline-mode", 0)) {
 257             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 258             return;
 259         }
 260         if (dc->waiting_LPE_type != INVALID_LPE) {
 261             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 262         }
 263     }
 264 }
 265
 266 /*
 267  * Selection handlers
 268  */
 269
 270 static void
 271 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 272 {
 273     // note: in draw context, selection_changed() is only called when a new item was created;
 274     // otherwise the following function call would yield wrong results
 275     spdc_check_for_and_apply_waiting_LPE(dc, sel->singleItem());
 276
 277     if (dc->attach) {
 278         spdc_attach_selection(dc, sel);
 279     }
 280 }
 281
 282 /* fixme: We have to ensure this is not delayed (Lauris) */
 283
 284 static void
 285 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 286 {
 287     if (dc->attach) {
 288         spdc_attach_selection(dc, sel);
 289     }
 290 }
 291
 292 static void
 293 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 294 {
 295     /* We reset white and forget white/start/end anchors */
 296     spdc_reset_white(dc);
 297     dc->sa = NULL;
 298     dc->ea = NULL;
 299
 300     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 301
 302     if ( item && SP_IS_PATH(item) ) {
 303         /* Create new white data */
 304         /* Item */
 305         dc->white_item = item;
 306         /* Curve list */
 307         /* We keep it in desktop coordinates to eliminate calculation errors */
 308         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 309         norm->transform(sp_item_i2d_affine(dc->white_item));
 310         g_return_if_fail( norm != NULL );
 311         dc->white_curves = g_slist_reverse(norm->split());
 312         norm->unref();
 313         /* Anchor list */
 314         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 315             SPCurve *c;
 316             c = (SPCurve*)l->data;
 317             g_return_if_fail( c->get_length() > 1 );
 318             if ( !c->is_closed() ) {
 319                 SPDrawAnchor *a;
 320                 a = sp_draw_anchor_new(dc, c, TRUE, c->first_point());
 321                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 322                 a = sp_draw_anchor_new(dc, c, FALSE, c->last_point());
 323                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 324             }
 325         }
 326         /* fixme: recalculate active anchor? */
 327     }
 328 }
 329
 330
 331 /**
 332  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 333  *
 334  *  \param dc draw context
 335  *  \param p cursor point (to be changed by snapping)
 336  *  \param o origin point
 337  *  \param state  keyboard state to check if ctrl was pressed
 338 */
 339
 340 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const o,
 341                                  guint state)
 342 {
 343     /* Control must be down for this snap to work */
 344     if ((state & GDK_CONTROL_MASK) == 0) {
 345         return;
 346     }
 347
 348     unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 349     /* 0 means no snapping. */
 350
 351     /* mirrored by fabs, so this corresponds to 15 degrees */
 352     NR::Point best; /* best solution */
 353     double bn = NR_HUGE; /* best normal */
 354     double bdot = 0;
 355     NR::Point v = NR::Point(0, 1);
 356     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 357     double const r10 = -r01, r11 = r00;
 358
 359     NR::Point delta = p - o;
 360
 361     for (unsigned i = 0; i < snaps; i++) {
 362         double const ndot = fabs(dot(v,NR::rot90(delta)));
 363         NR::Point t(r00*v[NR::X] + r01*v[NR::Y],
 364                     r10*v[NR::X] + r11*v[NR::Y]);
 365         if (ndot < bn) {
 366             /* I think it is better numerically to use the normal, rather than the dot product
 367              * to assess solutions, but I haven't proven it. */
 368             bn = ndot;
 369             best = v;
 370             bdot = dot(v, delta);
 371         }
 372         v = t;
 373     }
 374
 375     if (fabs(bdot) > 0) {
 376         p = o + bdot * best;
 377
 378         /* Snap it along best vector */
 379         SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 380         m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 381         m.constrainedSnapReturnByRef( Inkscape::Snapper::SNAPPOINT_NODE, p, Inkscape::Snapper::ConstraintLine(best));
 382     }
 383 }
 384
 385
 386 void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const state)
 387 {
 388     /* Shift disables this snap */
 389     if (state & GDK_SHIFT_MASK) {
 390         return;
 391     }
 392
 393     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 394     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 395     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, p);
 396 }
 397
 398 static SPCurve *
 399 reverse_then_unref(SPCurve *orig)
 400 {
 401     SPCurve *ret = orig->create_reverse();
 402     orig->unref();
 403     return ret;
 404 }
 405
 406 /**
 407  * Concats red, blue and green.
 408  * If any anchors are defined, process these, optionally removing curves from white list
 409  * Invoke _flush_white to write result back to object.
 410  */
 411 void
 412 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 413 {
 414     /* Concat RBG */
 415     SPCurve *c = dc->green_curve;
 416
 417     /* Green */
 418     dc->green_curve = new SPCurve(64);
 419     while (dc->green_bpaths) {
 420         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 421         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 422     }
 423     /* Blue */
 424     c->append_continuous(dc->blue_curve, 0.0625);
 425     dc->blue_curve->reset();
 426     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 427     /* Red */
 428     if (dc->red_curve_is_valid) {
 429         c->append_continuous(dc->red_curve, 0.0625);
 430     }
 431     dc->red_curve->reset();
 432     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 433
 434     if (c->is_empty()) {
 435         c->unref();
 436         return;
 437     }
 438
 439     /* Step A - test, whether we ended on green anchor */
 440     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 441         // We hit green anchor, closing Green-Blue-Red
 442         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 443         c->closepath_current();
 444         /* Closed path, just flush */
 445         spdc_flush_white(dc, c);
 446         c->unref();
 447         return;
 448     }
 449
 450     /* Step B - both start and end anchored to same curve */
 451     if ( dc->sa && dc->ea
 452          && ( dc->sa->curve == dc->ea->curve )
 453          && ( ( dc->sa != dc->ea )
 454               || dc->sa->curve->is_closed() ) )
 455     {
 456         // We hit bot start and end of single curve, closing paths
 457         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 458         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 459             c = reverse_then_unref(c);
 460         }
 461         dc->sa->curve->append_continuous(c, 0.0625);
 462         c->unref();
 463         dc->sa->curve->closepath_current();
 464         spdc_flush_white(dc, NULL);
 465         return;
 466     }
 467
 468     /* Step C - test start */
 469     if (dc->sa) {
 470         SPCurve *s = dc->sa->curve;
 471         dc->white_curves = g_slist_remove(dc->white_curves, s);
 472         if (dc->sa->start) {
 473             s = reverse_then_unref(s);
 474         }
 475         s->append_continuous(c, 0.0625);
 476         c->unref();
 477         c = s;
 478     } else /* Step D - test end */ if (dc->ea) {
 479         SPCurve *e = dc->ea->curve;
 480         dc->white_curves = g_slist_remove(dc->white_curves, e);
 481         if (!dc->ea->start) {
 482             e = reverse_then_unref(e);
 483         }
 484         c->append_continuous(e, 0.0625);
 485         e->unref();
 486     }
 487
 488
 489     spdc_flush_white(dc, c);
 490
 491     c->unref();
 492 }
 493
 494 static char const *
 495 tool_name(SPDrawContext *dc)
 496 {
 497     return ( SP_IS_PEN_CONTEXT(dc)
 498              ? "tools.freehand.pen"
 499              : "tools.freehand.pencil" );
 500 }
 501
 502 /*
 503  * Flushes white curve(s) and additional curve into object
 504  *
 505  * No cleaning of colored curves - this has to be done by caller
 506  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 507  *
 508  */
 509
 510 static void
 511 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 512 {
 513     SPCurve *c;
 514
 515     if (dc->white_curves) {
 516         g_assert(dc->white_item);
 517         c = SPCurve::concat(dc->white_curves);
 518         g_slist_free(dc->white_curves);
 519         dc->white_curves = NULL;
 520         if (gc) {
 521             c->append(gc, FALSE);
 522         }
 523     } else if (gc) {
 524         c = gc;
 525         c->ref();
 526     } else {
 527         return;
 528     }
 529
 530     /* Now we have to go back to item coordinates at last */
 531     c->transform(( dc->white_item
 532                             ? sp_item_dt2i_affine(dc->white_item)
 533                             : sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc)) ));
 534
 535     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 536     SPDocument *doc = sp_desktop_document(desktop);
 537     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 538
 539     if ( c && !c->is_empty() ) {
 540         /* We actually have something to write */
 541
 542         bool has_lpe = false;
 543         Inkscape::XML::Node *repr;
 544         if (dc->white_item) {
 545             repr = SP_OBJECT_REPR(dc->white_item);
 546             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 547         } else {
 548             repr = xml_doc->createElement("svg:path");
 549             /* Set style */
 550             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false);
 551         }
 552
 553         gchar *str = sp_svg_write_path( c->get_pathvector() );
 554         g_assert( str != NULL );
 555         if (has_lpe)
 556             repr->setAttribute("inkscape:original-d", str);
 557         else
 558             repr->setAttribute("d", str);
 559         g_free(str);
 560
 561         if (!dc->white_item) {
 562             /* Attach repr */
 563             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 564             dc->selection->set(repr);
 565             Inkscape::GC::release(repr);
 566             item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 567             item->updateRepr();
 568         }
 569
 570         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 571                          _("Draw path"));
 572
 573         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 574         // flushed before the selection_modified signal is fired by the previous change, which
 575         // results in the tool losing all of the selected path's curve except that last subpath. To
 576         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 577         // in sync immediately.
 578         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 579     }
 580
 581     c->unref();
 582
 583     /* Flush pending updates */
 584     sp_document_ensure_up_to_date(doc);
 585 }
 586
 587 /**
 588  * Returns FIRST active anchor (the activated one).
 589  */
 590 SPDrawAnchor *
 591 spdc_test_inside(SPDrawContext *dc, NR::Point p)
 592 {
 593     SPDrawAnchor *active = NULL;
 594
 595     /* Test green anchor */
 596     if (dc->green_anchor) {
 597         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 598     }
 599
 600     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 601         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 602         if ( !active && na ) {
 603             active = na;
 604         }
 605     }
 606
 607     return active;
 608 }
 609
 610 static void
 611 spdc_reset_white(SPDrawContext *dc)
 612 {
 613     if (dc->white_item) {
 614         /* We do not hold refcount */
 615         dc->white_item = NULL;
 616     }
 617     while (dc->white_curves) {
 618         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 619         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 620     }
 621     while (dc->white_anchors) {
 622         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 623         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 624     }
 625 }
 626
 627 static void
 628 spdc_free_colors(SPDrawContext *dc)
 629 {
 630     /* Red */
 631     if (dc->red_bpath) {
 632         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 633         dc->red_bpath = NULL;
 634     }
 635     if (dc->red_curve) {
 636         dc->red_curve = dc->red_curve->unref();
 637     }
 638     /* Blue */
 639     if (dc->blue_bpath) {
 640         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 641         dc->blue_bpath = NULL;
 642     }
 643     if (dc->blue_curve) {
 644         dc->blue_curve = dc->blue_curve->unref();
 645     }
 646     /* Green */
 647     while (dc->green_bpaths) {
 648         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 649         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 650     }
 651     if (dc->green_curve) {
 652         dc->green_curve = dc->green_curve->unref();
 653     }
 654     if (dc->green_anchor) {
 655         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 656     }
 657     /* White */
 658     if (dc->white_item) {
 659         /* We do not hold refcount */
 660         dc->white_item = NULL;
 661     }
 662     while (dc->white_curves) {
 663         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 664         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 665     }
 666     while (dc->white_anchors) {
 667         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 668         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 669     }
 670 }
 671
 672
 673 /*
 674   Local Variables:
 675   mode:c++
 676   c-file-style:"stroustrup"
 677   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 678   indent-tabs-mode:nil
 679   fill-column:99
 680   End:
 681 */
 682 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :