src/pen-context.cpp

   1 /** \file
   2  * Pen event context implementation.
   3  */
   4
   5 /*
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2000 Lauris Kaplinski
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  * Copyright (C) 2002 Lauris Kaplinski
  13  * Copyright (C) 2004 Monash University
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include "pen-context.h"
  21 #include "sp-namedview.h"
  22 #include "sp-metrics.h"
  23 #include "desktop.h"
  24 #include "desktop-handles.h"
  25 #include "selection.h"
  26 #include "draw-anchor.h"
  27 #include "message-stack.h"
  28 #include "message-context.h"
  29 #include "prefs-utils.h"
  30 #include "sp-path.h"
  31
  32 #include "pixmaps/cursor-pen.xpm"
  33 #include "display/canvas-bpath.h"
  34 #include "display/sp-ctrlline.h"
  35 #include "display/sodipodi-ctrl.h"
  36 #include <glibmm/i18n.h>
  37 #include "libnr/n-art-bpath.h"
  38 #include "helper/units.h"
  39 #include "macros.h"
  40 #include "context-fns.h"
  41
  42
  43 static void sp_pen_context_class_init(SPPenContextClass *klass);
  44 static void sp_pen_context_init(SPPenContext *pc);
  45 static void sp_pen_context_dispose(GObject *object);
  46
  47 static void sp_pen_context_setup(SPEventContext *ec);
  48 static void sp_pen_context_finish(SPEventContext *ec);
  49 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  50 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  51 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  52
  53 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  54 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  55 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  56 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  57
  58 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  59
  60 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  61 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  62 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  63 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  64 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  65 static void spdc_reset_colors(SPPenContext *pc);
  66
  67 static void pen_disable_events(SPPenContext *const pc);
  68 static void pen_enable_events(SPPenContext *const pc);
  69
  70 static NR::Point pen_drag_origin_w(0, 0);
  71 static bool pen_within_tolerance = false;
  72
  73 static SPDrawContextClass *pen_parent_class;
  74
  75 /**
  76  * Register SPPenContext with Gdk and return its type.
  77  */
  78 GType
  79 sp_pen_context_get_type(void)
  80 {
  81     static GType type = 0;
  82     if (!type) {
  83         GTypeInfo info = {
  84             sizeof(SPPenContextClass),
  85             NULL, NULL,
  86             (GClassInitFunc) sp_pen_context_class_init,
  87             NULL, NULL,
  88             sizeof(SPPenContext),
  89             4,
  90             (GInstanceInitFunc) sp_pen_context_init,
  91             NULL,   /* value_table */
  92         };
  93         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  94     }
  95     return type;
  96 }
  97
  98 /**
  99  * Initialize the SPPenContext vtable.
 100  */
 101 static void
 102 sp_pen_context_class_init(SPPenContextClass *klass)
 103 {
 104     GObjectClass *object_class;
 105     SPEventContextClass *event_context_class;
 106
 107     object_class = (GObjectClass *) klass;
 108     event_context_class = (SPEventContextClass *) klass;
 109
 110     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 111
 112     object_class->dispose = sp_pen_context_dispose;
 113
 114     event_context_class->setup = sp_pen_context_setup;
 115     event_context_class->finish = sp_pen_context_finish;
 116     event_context_class->set = sp_pen_context_set;
 117     event_context_class->root_handler = sp_pen_context_root_handler;
 118     event_context_class->item_handler = sp_pen_context_item_handler;
 119 }
 120
 121 /**
 122  * Callback to initialize SPPenContext object.
 123  */
 124 static void
 125 sp_pen_context_init(SPPenContext *pc)
 126 {
 127
 128     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 129
 130     event_context->cursor_shape = cursor_pen_xpm;
 131     event_context->hot_x = 4;
 132     event_context->hot_y = 4;
 133
 134     pc->npoints = 0;
 135     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 136     pc->state = SP_PEN_CONTEXT_POINT;
 137
 138     pc->c0 = NULL;
 139     pc->c1 = NULL;
 140     pc->cl0 = NULL;
 141     pc->cl1 = NULL;
 142
 143     pc->events_disabled = 0;
 144 }
 145
 146 /**
 147  * Callback to destroy the SPPenContext object's members and itself.
 148  */
 149 static void
 150 sp_pen_context_dispose(GObject *object)
 151 {
 152     SPPenContext *pc;
 153
 154     pc = SP_PEN_CONTEXT(object);
 155
 156     if (pc->c0) {
 157         gtk_object_destroy(GTK_OBJECT(pc->c0));
 158         pc->c0 = NULL;
 159     }
 160     if (pc->c1) {
 161         gtk_object_destroy(GTK_OBJECT(pc->c1));
 162         pc->c1 = NULL;
 163     }
 164     if (pc->cl0) {
 165         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 166         pc->cl0 = NULL;
 167     }
 168     if (pc->cl1) {
 169         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 170         pc->cl1 = NULL;
 171     }
 172
 173     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 174 }
 175
 176 /**
 177  * Callback to initialize SPPenContext object.
 178  */
 179 static void
 180 sp_pen_context_setup(SPEventContext *ec)
 181 {
 182     SPPenContext *pc;
 183
 184     pc = SP_PEN_CONTEXT(ec);
 185
 186     if (((SPEventContextClass *) pen_parent_class)->setup) {
 187         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 188     }
 189
 190     /* Pen indicators */
 191     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 192                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 193     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 194                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 195     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 196     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 197     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 198     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 199
 200     sp_canvas_item_hide(pc->c0);
 201     sp_canvas_item_hide(pc->c1);
 202     sp_canvas_item_hide(pc->cl0);
 203     sp_canvas_item_hide(pc->cl1);
 204
 205     sp_event_context_read(ec, "mode");
 206
 207     pc->anchor_statusbar = false;
 208
 209     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 210         ec->enableSelectionCue();
 211     }
 212 }
 213
 214 static void
 215 pen_cancel (SPPenContext *const pc)
 216 {
 217     pc->state = SP_PEN_CONTEXT_STOP;
 218     spdc_reset_colors(pc);
 219     sp_canvas_item_hide(pc->c0);
 220     sp_canvas_item_hide(pc->c1);
 221     sp_canvas_item_hide(pc->cl0);
 222     sp_canvas_item_hide(pc->cl1);
 223     pc->_message_context->clear();
 224     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 225
 226     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 227 }
 228
 229 /**
 230  * Finalization callback.
 231  */
 232 static void
 233 sp_pen_context_finish(SPEventContext *ec)
 234 {
 235     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 236
 237     if (pc->npoints != 0) {
 238         pen_cancel (pc);
 239     }
 240
 241     if (((SPEventContextClass *) pen_parent_class)->finish) {
 242         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 243     }
 244 }
 245
 246 /**
 247  * Callback that sets key to value in pen context.
 248  */
 249 static void
 250 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 251 {
 252     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 253
 254     if (!strcmp(key, "mode")) {
 255         if ( val && !strcmp(val, "drag") ) {
 256             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 257         } else {
 258             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 259         }
 260     }
 261 }
 262
 263 /**
 264  * Snaps new node relative to the previous node.
 265  */
 266 static void
 267 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 268 {
 269     if (pc->npoints > 0) {
 270         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 271     }
 272
 273     spdc_endpoint_snap_free(pc, p, state);
 274 }
 275
 276 /**
 277  * Snaps new node's handle relative to the new node.
 278  */
 279 static void
 280 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 281 {
 282     g_return_if_fail(( pc->npoints == 2 ||
 283                        pc->npoints == 5   ));
 284
 285     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 286     spdc_endpoint_snap_free(pc, p, state);
 287 }
 288
 289 static gint
 290 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 291 {
 292     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 293
 294     gint ret = FALSE;
 295
 296     switch (event->type) {
 297         case GDK_BUTTON_PRESS:
 298             ret = pen_handle_button_press(pc, event->button);
 299             break;
 300         default:
 301             break;
 302     }
 303
 304     if (!ret) {
 305         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 306             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 307     }
 308
 309     return ret;
 310 }
 311
 312 /**
 313  * Callback to handle all pen events.
 314  */
 315 static gint
 316 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 317 {
 318     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 319
 320     gint ret = FALSE;
 321
 322     switch (event->type) {
 323         case GDK_BUTTON_PRESS:
 324             ret = pen_handle_button_press(pc, event->button);
 325             break;
 326
 327         case GDK_MOTION_NOTIFY:
 328             ret = pen_handle_motion_notify(pc, event->motion);
 329             break;
 330
 331         case GDK_BUTTON_RELEASE:
 332             ret = pen_handle_button_release(pc, event->button);
 333             break;
 334
 335         case GDK_2BUTTON_PRESS:
 336             ret = pen_handle_2button_press(pc, event->button);
 337             break;
 338
 339         case GDK_KEY_PRESS:
 340             ret = pen_handle_key_press(pc, event);
 341             break;
 342
 343         default:
 344             break;
 345     }
 346
 347     if (!ret) {
 348         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 349             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 350         if (parent_root_handler) {
 351             ret = parent_root_handler(ec, event);
 352         }
 353     }
 354
 355     return ret;
 356 }
 357
 358 /**
 359  * Handle mouse button press event.
 360  */
 361 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 362 {
 363     if (pc->events_disabled) {
 364         // skip event processing if events are disabled
 365         return FALSE;
 366     }
 367
 368     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 369     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 370     NR::Point const event_w(bevent.x, bevent.y);
 371     NR::Point const event_dt(desktop->w2d(event_w));
 372     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 373
 374     gint ret = FALSE;
 375     if (bevent.button == 1 && !event_context->space_panning) {
 376
 377         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 378             return TRUE;
 379         }
 380
 381         pen_drag_origin_w = event_w;
 382         pen_within_tolerance = true;
 383
 384         /* Test whether we hit any anchor. */
 385         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 386
 387         switch (pc->mode) {
 388             case SP_PEN_CONTEXT_MODE_CLICK:
 389                 /* In click mode we add point on release */
 390                 switch (pc->state) {
 391                     case SP_PEN_CONTEXT_POINT:
 392                     case SP_PEN_CONTEXT_CONTROL:
 393                     case SP_PEN_CONTEXT_CLOSE:
 394                         break;
 395                     case SP_PEN_CONTEXT_STOP:
 396                         /* This is allowed, if we just cancelled curve */
 397                         pc->state = SP_PEN_CONTEXT_POINT;
 398                         break;
 399                     default:
 400                         break;
 401                 }
 402                 break;
 403             case SP_PEN_CONTEXT_MODE_DRAG:
 404                 switch (pc->state) {
 405                     case SP_PEN_CONTEXT_STOP:
 406                         /* This is allowed, if we just cancelled curve */
 407                     case SP_PEN_CONTEXT_POINT:
 408                         if (pc->npoints == 0) {
 409
 410                             /* Set start anchor */
 411                             pc->sa = anchor;
 412                             NR::Point p;
 413                             if (anchor) {
 414
 415                                 /* Adjust point to anchor if needed */
 416                                 p = anchor->dp;
 417                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 418
 419                             } else {
 420
 421                                 // This is the first click of a new curve; deselect item so that
 422                                 // this curve is not combined with it (unless it is drawn from its
 423                                 // anchor, which is handled by the sibling branch above)
 424                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 425                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 426
 427                                     selection->clear();
 428                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 429
 430                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 431
 432                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 433                                 }
 434
 435                                 /* Create green anchor */
 436                                 p = event_dt;
 437                                 spdc_endpoint_snap(pc, p, bevent.state);
 438                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 439                             }
 440                             spdc_pen_set_initial_point(pc, p);
 441                         } else {
 442
 443                             /* Set end anchor */
 444                             pc->ea = anchor;
 445                             NR::Point p;
 446                             if (anchor) {
 447
 448                                 p = anchor->dp;
 449                                 // we hit an anchor, will finish the curve (either with or without closing)
 450                                 // in release handler
 451                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 452
 453                                 if (pc->green_anchor && pc->green_anchor->active) {
 454                                     // we clicked on the current curve start, so close it even if
 455                                     // we drag a handle away from it
 456                                     dc->green_closed = TRUE;
 457                                 }
 458                                 ret = TRUE;
 459                                 break;
 460
 461                             } else {
 462
 463                                 p = event_dt;
 464                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 465                                 spdc_pen_set_subsequent_point(pc, p, true);
 466                             }
 467
 468                         }
 469                         pc->state = SP_PEN_CONTEXT_CONTROL;
 470                         ret = TRUE;
 471                         break;
 472                     case SP_PEN_CONTEXT_CONTROL:
 473                         g_warning("Button down in CONTROL state");
 474                         break;
 475                     case SP_PEN_CONTEXT_CLOSE:
 476                         g_warning("Button down in CLOSE state");
 477                         break;
 478                     default:
 479                         break;
 480                 }
 481                 break;
 482             default:
 483                 break;
 484         }
 485     } else if (bevent.button == 3) {
 486         if (pc->npoints != 0) {
 487
 488             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 489             if (pc->green_closed) {
 490                 // finishing at the start anchor, close curve
 491                 spdc_pen_finish(pc, TRUE);
 492             } else {
 493                 // finishing at some other anchor, finish curve but not close
 494                 spdc_pen_finish(pc, FALSE);
 495             }
 496
 497             ret = TRUE;
 498         }
 499     }
 500
 501     return ret;
 502 }
 503
 504 /**
 505  * Handle motion_notify event.
 506  */
 507 static gint
 508 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 509 {
 510     gint ret = FALSE;
 511
 512     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 513
 514     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 515         // allow scrolling
 516         return FALSE;
 517     }
 518
 519     if (pc->events_disabled) {
 520         // skip motion events if pen events are disabled
 521         return FALSE;
 522     }
 523
 524     NR::Point const event_w(mevent.x,
 525                             mevent.y);
 526     if (pen_within_tolerance) {
 527         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 528                                                                "value", 0, 0, 100);
 529         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 530             return FALSE;   // Do not drag if we're within tolerance from origin.
 531         }
 532     }
 533     // Once the user has moved farther than tolerance from the original location
 534     // (indicating they intend to move the object, not click), then always process the
 535     // motion notify coordinates as given (no snapping back to origin)
 536     pen_within_tolerance = false;
 537
 538     SPDesktop *const dt = pc->desktop;
 539     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 540         /* Grab mouse, so release will not pass unnoticed */
 541         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 542         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 543                                         GDK_BUTTON_RELEASE_MASK |
 544                                         GDK_POINTER_MOTION_MASK  ),
 545                             NULL, mevent.time);
 546     }
 547
 548     /* Find desktop coordinates */
 549     NR::Point p = dt->w2d(event_w);
 550
 551     /* Test, whether we hit any anchor */
 552     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 553
 554     switch (pc->mode) {
 555         case SP_PEN_CONTEXT_MODE_CLICK:
 556             switch (pc->state) {
 557                 case SP_PEN_CONTEXT_POINT:
 558                     if ( pc->npoints != 0 ) {
 559                         /* Only set point, if we are already appending */
 560                         spdc_endpoint_snap(pc, p, mevent.state);
 561                         spdc_pen_set_subsequent_point(pc, p, true);
 562                         ret = TRUE;
 563                     }
 564                     break;
 565                 case SP_PEN_CONTEXT_CONTROL:
 566                 case SP_PEN_CONTEXT_CLOSE:
 567                     /* Placing controls is last operation in CLOSE state */
 568                     spdc_endpoint_snap(pc, p, mevent.state);
 569                     spdc_pen_set_ctrl(pc, p, mevent.state);
 570                     ret = TRUE;
 571                     break;
 572                 case SP_PEN_CONTEXT_STOP:
 573                     /* This is perfectly valid */
 574                     break;
 575                 default:
 576                     break;
 577             }
 578             break;
 579         case SP_PEN_CONTEXT_MODE_DRAG:
 580             switch (pc->state) {
 581                 case SP_PEN_CONTEXT_POINT:
 582                     if ( pc->npoints > 0 ) {
 583                         /* Only set point, if we are already appending */
 584
 585                         if (!anchor) {   /* Snap node only if not hitting anchor */
 586                             spdc_endpoint_snap(pc, p, mevent.state);
 587                         }
 588
 589                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 590
 591                         if (anchor && !pc->anchor_statusbar) {
 592                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 593                             pc->anchor_statusbar = true;
 594                         } else if (!anchor && pc->anchor_statusbar) {
 595                             pc->_message_context->clear();
 596                             pc->anchor_statusbar = false;
 597                         }
 598
 599                         ret = TRUE;
 600                     } else {
 601                         if (anchor && !pc->anchor_statusbar) {
 602                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 603                             pc->anchor_statusbar = true;
 604                         } else if (!anchor && pc->anchor_statusbar) {
 605                             pc->_message_context->clear();
 606                             pc->anchor_statusbar = false;
 607                         }
 608                     }
 609                     break;
 610                 case SP_PEN_CONTEXT_CONTROL:
 611                 case SP_PEN_CONTEXT_CLOSE:
 612                     /* Placing controls is last operation in CLOSE state */
 613
 614                     // snap the handle
 615                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 616
 617                     spdc_pen_set_ctrl(pc, p, mevent.state);
 618                     gobble_motion_events(GDK_BUTTON1_MASK);
 619                     ret = TRUE;
 620                     break;
 621                 case SP_PEN_CONTEXT_STOP:
 622                     /* This is perfectly valid */
 623                     break;
 624                 default:
 625                     break;
 626             }
 627             break;
 628         default:
 629             break;
 630     }
 631     return ret;
 632 }
 633
 634 /**
 635  * Handle mouse button release event.
 636  */
 637 static gint
 638 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 639 {
 640     if (pc->events_disabled) {
 641         // skip event processing if events are disabled
 642         return FALSE;
 643     }
 644
 645     gint ret = FALSE;
 646     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 647     if ( revent.button == 1  && !event_context->space_panning) {
 648
 649         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 650
 651         NR::Point const event_w(revent.x,
 652                                 revent.y);
 653         /* Find desktop coordinates */
 654         NR::Point p = pc->desktop->w2d(event_w);
 655
 656         /* Test whether we hit any anchor. */
 657         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 658
 659         switch (pc->mode) {
 660             case SP_PEN_CONTEXT_MODE_CLICK:
 661                 switch (pc->state) {
 662                     case SP_PEN_CONTEXT_POINT:
 663                         if ( pc->npoints == 0 ) {
 664                             /* Start new thread only with button release */
 665                             if (anchor) {
 666                                 p = anchor->dp;
 667                             }
 668                             pc->sa = anchor;
 669                             spdc_pen_set_initial_point(pc, p);
 670                         } else {
 671                             /* Set end anchor here */
 672                             pc->ea = anchor;
 673                             if (anchor) {
 674                                 p = anchor->dp;
 675                             }
 676                         }
 677                         pc->state = SP_PEN_CONTEXT_CONTROL;
 678                         ret = TRUE;
 679                         break;
 680                     case SP_PEN_CONTEXT_CONTROL:
 681                         /* End current segment */
 682                         spdc_endpoint_snap(pc, p, revent.state);
 683                         spdc_pen_finish_segment(pc, p, revent.state);
 684                         pc->state = SP_PEN_CONTEXT_POINT;
 685                         ret = TRUE;
 686                         break;
 687                     case SP_PEN_CONTEXT_CLOSE:
 688                         /* End current segment */
 689                         if (!anchor) {   /* Snap node only if not hitting anchor */
 690                             spdc_endpoint_snap(pc, p, revent.state);
 691                         }
 692                         spdc_pen_finish_segment(pc, p, revent.state);
 693                         spdc_pen_finish(pc, TRUE);
 694                         pc->state = SP_PEN_CONTEXT_POINT;
 695                         ret = TRUE;
 696                         break;
 697                     case SP_PEN_CONTEXT_STOP:
 698                         /* This is allowed, if we just cancelled curve */
 699                         pc->state = SP_PEN_CONTEXT_POINT;
 700                         ret = TRUE;
 701                         break;
 702                     default:
 703                         break;
 704                 }
 705                 break;
 706             case SP_PEN_CONTEXT_MODE_DRAG:
 707                 switch (pc->state) {
 708                     case SP_PEN_CONTEXT_POINT:
 709                     case SP_PEN_CONTEXT_CONTROL:
 710                         spdc_endpoint_snap(pc, p, revent.state);
 711                         spdc_pen_finish_segment(pc, p, revent.state);
 712                         break;
 713                     case SP_PEN_CONTEXT_CLOSE:
 714                         spdc_endpoint_snap(pc, p, revent.state);
 715                         spdc_pen_finish_segment(pc, p, revent.state);
 716                         if (pc->green_closed) {
 717                             // finishing at the start anchor, close curve
 718                             spdc_pen_finish(pc, TRUE);
 719                         } else {
 720                             // finishing at some other anchor, finish curve but not close
 721                             spdc_pen_finish(pc, FALSE);
 722                         }
 723                         break;
 724                     case SP_PEN_CONTEXT_STOP:
 725                         /* This is allowed, if we just cancelled curve */
 726                         break;
 727                     default:
 728                         break;
 729                 }
 730                 pc->state = SP_PEN_CONTEXT_POINT;
 731                 ret = TRUE;
 732                 break;
 733             default:
 734                 break;
 735         }
 736
 737         if (pc->grab) {
 738             /* Release grab now */
 739             sp_canvas_item_ungrab(pc->grab, revent.time);
 740             pc->grab = NULL;
 741         }
 742
 743         ret = TRUE;
 744
 745         dc->green_closed = FALSE;
 746     }
 747
 748     return ret;
 749 }
 750
 751 static gint
 752 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 753 {
 754     gint ret = FALSE;
 755     if (pc->npoints != 0 && bevent.button != 2) {
 756         spdc_pen_finish(pc, FALSE);
 757         ret = TRUE;
 758     }
 759     return ret;
 760 }
 761
 762 void
 763 pen_redraw_all (SPPenContext *const pc)
 764 {
 765     // green
 766     if (pc->green_bpaths) {
 767         // remove old piecewise green canvasitems
 768         while (pc->green_bpaths) {
 769             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 770             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 771         }
 772         // one canvas bpath for all of green_curve
 773         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 774         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 775         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 776
 777         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 778     }
 779
 780     if (pc->green_anchor)
 781         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 782
 783     sp_curve_reset(pc->red_curve);
 784     sp_curve_moveto(pc->red_curve, pc->p[0]);
 785     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 786     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 787
 788     // handles
 789     if (pc->p[0] != pc->p[1]) {
 790         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 791         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 792         sp_canvas_item_show (pc->c1);
 793         sp_canvas_item_show (pc->cl1);
 794     } else {
 795         sp_canvas_item_hide (pc->c1);
 796         sp_canvas_item_hide (pc->cl1);
 797     }
 798
 799     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 800     if (bpath) {
 801         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 802             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 803             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 804             sp_canvas_item_show (pc->c0);
 805             sp_canvas_item_show (pc->cl0);
 806         } else {
 807             sp_canvas_item_hide (pc->c0);
 808             sp_canvas_item_hide (pc->cl0);
 809         }
 810     }
 811 }
 812
 813 void
 814 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 815 {
 816     if (pc->npoints != 5)
 817         return;
 818
 819     // green
 820     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 821     if (bpath) {
 822         if (bpath->code == NR_CURVETO) {
 823             bpath->x2 += x;
 824             bpath->y2 += y;
 825         }
 826         bpath->x3 += x;
 827         bpath->y3 += y;
 828     } else {
 829         // start anchor too
 830         if (pc->green_anchor) {
 831             pc->green_anchor->dp += NR::Point(x, y);
 832         }
 833     }
 834
 835     // red
 836     pc->p[0] += NR::Point(x, y);
 837     pc->p[1] += NR::Point(x, y);
 838     pen_redraw_all(pc);
 839 }
 840
 841 void
 842 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 843 {
 844     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 845 }
 846
 847 void
 848 pen_lastpoint_tocurve (SPPenContext *const pc)
 849 {
 850     if (pc->npoints != 5)
 851         return;
 852
 853     // red
 854     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 855     if (bpath && bpath->code == NR_CURVETO) {
 856         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 857     } else {
 858         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 859     }
 860
 861     pen_redraw_all(pc);
 862 }
 863
 864 void
 865 pen_lastpoint_toline (SPPenContext *const pc)
 866 {
 867     if (pc->npoints != 5)
 868         return;
 869
 870     pc->p[1] = pc->p[0];
 871
 872     pen_redraw_all(pc);
 873 }
 874
 875
 876 static gint
 877 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 878 {
 879     gint ret = FALSE;
 880     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 881
 882     switch (get_group0_keyval (&event->key)) {
 883
 884         case GDK_Left: // move last point left
 885         case GDK_KP_Left:
 886         case GDK_KP_4:
 887             if (!MOD__CTRL) { // not ctrl
 888                 if (MOD__ALT) { // alt
 889                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 890                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 891                 }
 892                 else { // no alt
 893                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 894                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 895                 }
 896                 ret = TRUE;
 897             }
 898             break;
 899         case GDK_Up: // move last point up
 900         case GDK_KP_Up:
 901         case GDK_KP_8:
 902             if (!MOD__CTRL) { // not ctrl
 903                 if (MOD__ALT) { // alt
 904                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 905                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 906                 }
 907                 else { // no alt
 908                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 909                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 910                 }
 911                 ret = TRUE;
 912             }
 913             break;
 914         case GDK_Right: // move last point right
 915         case GDK_KP_Right:
 916         case GDK_KP_6:
 917             if (!MOD__CTRL) { // not ctrl
 918                 if (MOD__ALT) { // alt
 919                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 920                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 921                 }
 922                 else { // no alt
 923                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 924                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 925                 }
 926                 ret = TRUE;
 927             }
 928             break;
 929         case GDK_Down: // move last point down
 930         case GDK_KP_Down:
 931         case GDK_KP_2:
 932             if (!MOD__CTRL) { // not ctrl
 933                 if (MOD__ALT) { // alt
 934                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 935                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 936                 }
 937                 else { // no alt
 938                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 939                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 940                 }
 941                 ret = TRUE;
 942             }
 943             break;
 944
 945         case GDK_U:
 946         case GDK_u:
 947             if (MOD__SHIFT_ONLY) {
 948                 pen_lastpoint_tocurve(pc);
 949                 ret = TRUE;
 950             }
 951             break;
 952         case GDK_L:
 953         case GDK_l:
 954             if (MOD__SHIFT_ONLY) {
 955                 pen_lastpoint_toline(pc);
 956                 ret = TRUE;
 957             }
 958             break;
 959
 960         case GDK_Return:
 961         case GDK_KP_Enter:
 962             if (pc->npoints != 0) {
 963                 spdc_pen_finish(pc, FALSE);
 964                 ret = TRUE;
 965             }
 966             break;
 967         case GDK_Escape:
 968             if (pc->npoints != 0) {
 969                 // if drawing, cancel, otherwise pass it up for deselecting
 970                 pen_cancel (pc);
 971                 ret = TRUE;
 972             }
 973             break;
 974         case GDK_z:
 975         case GDK_Z:
 976             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 977                 // if drawing, cancel, otherwise pass it up for undo
 978                 pen_cancel (pc);
 979                 ret = TRUE;
 980             }
 981             break;
 982         case GDK_BackSpace:
 983         case GDK_Delete:
 984         case GDK_KP_Delete:
 985             if (sp_curve_is_empty(pc->green_curve)) {
 986                 pen_cancel (pc);
 987                 ret = TRUE;
 988             } else {
 989                 /* Reset red curve */
 990                 sp_curve_reset(pc->red_curve);
 991                 /* Destroy topmost green bpath */
 992                 if (pc->green_bpaths) {
 993                     if (pc->green_bpaths->data)
 994                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 995                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 996                 }
 997                 /* Get last segment */
 998                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
 999                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1000                 if ( e < 2 ) {
1001                     g_warning("Green curve length is %d", e);
1002                     break;
1003                 }
1004                 pc->p[0] = p[e - 2].c(3);
1005                 if (p[e - 1].code == NR_CURVETO) {
1006                     pc->p[1] = p[e - 1].c(1);
1007                 } else {
1008                     pc->p[1] = pc->p[0];
1009                 }
1010                 NR::Point const pt(( pc->npoints < 4
1011                                      ? p[e - 1].c(3)
1012                                      : pc->p[3] ));
1013                 pc->npoints = 2;
1014                 sp_curve_backspace(pc->green_curve);
1015                 sp_canvas_item_hide(pc->c0);
1016                 sp_canvas_item_hide(pc->c1);
1017                 sp_canvas_item_hide(pc->cl0);
1018                 sp_canvas_item_hide(pc->cl1);
1019                 pc->state = SP_PEN_CONTEXT_POINT;
1020                 spdc_pen_set_subsequent_point(pc, pt, true);
1021                 ret = TRUE;
1022             }
1023             break;
1024         default:
1025             break;
1026     }
1027     return ret;
1028 }
1029
1030 static void
1031 spdc_reset_colors(SPPenContext *pc)
1032 {
1033     /* Red */
1034     sp_curve_reset(pc->red_curve);
1035     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1036     /* Blue */
1037     sp_curve_reset(pc->blue_curve);
1038     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1039     /* Green */
1040     while (pc->green_bpaths) {
1041         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1042         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1043     }
1044     sp_curve_reset(pc->green_curve);
1045     if (pc->green_anchor) {
1046         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1047     }
1048     pc->sa = NULL;
1049     pc->ea = NULL;
1050     pc->npoints = 0;
1051     pc->red_curve_is_valid = false;
1052 }
1053
1054
1055 static void
1056 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1057 {
1058     g_assert( pc->npoints == 0 );
1059
1060     pc->p[0] = p;
1061     pc->p[1] = p;
1062     pc->npoints = 2;
1063     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1064
1065     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1066 }
1067
1068 static void
1069 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1070 {
1071     g_assert( pc->npoints != 0 );
1072     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1073
1074     pc->p[2] = p;
1075     pc->p[3] = p;
1076     pc->p[4] = p;
1077     pc->npoints = 5;
1078     sp_curve_reset(pc->red_curve);
1079     sp_curve_moveto(pc->red_curve, pc->p[0]);
1080     bool is_curve;
1081     if ( (pc->onlycurves)
1082          || ( pc->p[1] != pc->p[0] ) )
1083     {
1084         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1085         is_curve = true;
1086     } else {
1087         sp_curve_lineto(pc->red_curve, p);
1088         is_curve = false;
1089     }
1090
1091     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1092
1093     if (statusbar) {
1094         // status text
1095         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1096         NR::Point rel = p - pc->p[0];
1097         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1098         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1099         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1100             angle = angle_to_compass (angle);
1101         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path"), is_curve? "Curve segment" : "Line segment", angle, dist->str);
1102         g_string_free(dist, FALSE);
1103     }
1104 }
1105
1106 static void
1107 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1108 {
1109     sp_canvas_item_show(pc->c1);
1110     sp_canvas_item_show(pc->cl1);
1111
1112     if ( pc->npoints == 2 ) {
1113         pc->p[1] = p;
1114         sp_canvas_item_hide(pc->c0);
1115         sp_canvas_item_hide(pc->cl0);
1116         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1117         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1118
1119         // status text
1120         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1121         NR::Point rel = p - pc->p[0];
1122         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1123         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1124         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1125             angle = angle_to_compass (angle);
1126         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1127         g_string_free(dist, FALSE);
1128
1129     } else if ( pc->npoints == 5 ) {
1130         pc->p[4] = p;
1131         sp_canvas_item_show(pc->c0);
1132         sp_canvas_item_show(pc->cl0);
1133         bool is_symm = false;
1134         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1135              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1136             NR::Point delta = p - pc->p[3];
1137             pc->p[2] = pc->p[3] - delta;
1138             is_symm = true;
1139             sp_curve_reset(pc->red_curve);
1140             sp_curve_moveto(pc->red_curve, pc->p[0]);
1141             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1142             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1143         }
1144         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1145         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1146         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1147         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1148
1149         // status text
1150         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1151         NR::Point rel = p - pc->p[3];
1152         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1153         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1154         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1155             angle = angle_to_compass (angle);
1156         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only"), is_symm? "Curve handle, symmetric" : "Curve handle", angle, dist->str);
1157         g_string_free(dist, FALSE);
1158
1159     } else {
1160         g_warning("Something bad happened - npoints is %d", pc->npoints);
1161     }
1162 }
1163
1164 static void
1165 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1166 {
1167     if (!sp_curve_empty(pc->red_curve)) {
1168         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1169         SPCurve *curve = sp_curve_copy(pc->red_curve);
1170         /// \todo fixme:
1171         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1172         sp_curve_unref(curve);
1173         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1174
1175         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1176
1177         pc->p[0] = pc->p[3];
1178         pc->p[1] = pc->p[4];
1179         pc->npoints = 2;
1180
1181         sp_curve_reset(pc->red_curve);
1182     }
1183 }
1184
1185 static void
1186 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1187 {
1188     pen_disable_events(pc);
1189
1190     SPDesktop *const desktop = pc->desktop;
1191     pc->_message_context->clear();
1192     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1193
1194     sp_curve_reset(pc->red_curve);
1195     spdc_concat_colors_and_flush(pc, closed);
1196     pc->sa = NULL;
1197     pc->ea = NULL;
1198
1199     pc->npoints = 0;
1200     pc->state = SP_PEN_CONTEXT_POINT;
1201
1202     sp_canvas_item_hide(pc->c0);
1203     sp_canvas_item_hide(pc->c1);
1204     sp_canvas_item_hide(pc->cl0);
1205     sp_canvas_item_hide(pc->cl1);
1206
1207     if (pc->green_anchor) {
1208         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1209     }
1210
1211
1212     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1213
1214     pen_enable_events(pc);
1215 }
1216
1217 static void
1218 pen_disable_events(SPPenContext *const pc) {
1219   pc->events_disabled++;
1220 }
1221
1222 static void
1223 pen_enable_events(SPPenContext *const pc) {
1224   g_return_if_fail(pc->events_disabled != 0);
1225
1226   pc->events_disabled--;
1227 }
1228
1229 /*
1230   Local Variables:
1231   mode:c++
1232   c-file-style:"stroustrup"
1233   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1234   indent-tabs-mode:nil
1235   fill-column:99
1236   End:
1237 */
1238 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :