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 "selection-chemistry.h"
  27 #include "draw-anchor.h"
  28 #include "message-stack.h"
  29 #include "message-context.h"
  30 #include "prefs-utils.h"
  31 #include "sp-path.h"
  32
  33 #include "pixmaps/cursor-pen.xpm"
  34 #include "display/canvas-bpath.h"
  35 #include "display/sp-ctrlline.h"
  36 #include "display/sodipodi-ctrl.h"
  37 #include <glibmm/i18n.h>
  38 #include "libnr/n-art-bpath.h"
  39 #include "helper/units.h"
  40 #include "macros.h"
  41 #include "context-fns.h"
  42
  43
  44 static void sp_pen_context_class_init(SPPenContextClass *klass);
  45 static void sp_pen_context_init(SPPenContext *pc);
  46 static void sp_pen_context_dispose(GObject *object);
  47
  48 static void sp_pen_context_setup(SPEventContext *ec);
  49 static void sp_pen_context_finish(SPEventContext *ec);
  50 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  51 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  52 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  53
  54 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  55 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  56 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  57 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  58
  59 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  60
  61 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  62 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  63 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  64 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  65 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  66 static void spdc_reset_colors(SPPenContext *pc);
  67
  68 static void pen_disable_events(SPPenContext *const pc);
  69 static void pen_enable_events(SPPenContext *const pc);
  70
  71 static NR::Point pen_drag_origin_w(0, 0);
  72 static bool pen_within_tolerance = false;
  73
  74 static SPDrawContextClass *pen_parent_class;
  75
  76 /**
  77  * Register SPPenContext with Gdk and return its type.
  78  */
  79 GType
  80 sp_pen_context_get_type(void)
  81 {
  82     static GType type = 0;
  83     if (!type) {
  84         GTypeInfo info = {
  85             sizeof(SPPenContextClass),
  86             NULL, NULL,
  87             (GClassInitFunc) sp_pen_context_class_init,
  88             NULL, NULL,
  89             sizeof(SPPenContext),
  90             4,
  91             (GInstanceInitFunc) sp_pen_context_init,
  92             NULL,   /* value_table */
  93         };
  94         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  95     }
  96     return type;
  97 }
  98
  99 /**
 100  * Initialize the SPPenContext vtable.
 101  */
 102 static void
 103 sp_pen_context_class_init(SPPenContextClass *klass)
 104 {
 105     GObjectClass *object_class;
 106     SPEventContextClass *event_context_class;
 107
 108     object_class = (GObjectClass *) klass;
 109     event_context_class = (SPEventContextClass *) klass;
 110
 111     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 112
 113     object_class->dispose = sp_pen_context_dispose;
 114
 115     event_context_class->setup = sp_pen_context_setup;
 116     event_context_class->finish = sp_pen_context_finish;
 117     event_context_class->set = sp_pen_context_set;
 118     event_context_class->root_handler = sp_pen_context_root_handler;
 119     event_context_class->item_handler = sp_pen_context_item_handler;
 120 }
 121
 122 /**
 123  * Callback to initialize SPPenContext object.
 124  */
 125 static void
 126 sp_pen_context_init(SPPenContext *pc)
 127 {
 128
 129     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 130
 131     event_context->cursor_shape = cursor_pen_xpm;
 132     event_context->hot_x = 4;
 133     event_context->hot_y = 4;
 134
 135     pc->npoints = 0;
 136     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 137     pc->state = SP_PEN_CONTEXT_POINT;
 138
 139     pc->c0 = NULL;
 140     pc->c1 = NULL;
 141     pc->cl0 = NULL;
 142     pc->cl1 = NULL;
 143
 144     pc->events_disabled = 0;
 145 }
 146
 147 /**
 148  * Callback to destroy the SPPenContext object's members and itself.
 149  */
 150 static void
 151 sp_pen_context_dispose(GObject *object)
 152 {
 153     SPPenContext *pc;
 154
 155     pc = SP_PEN_CONTEXT(object);
 156
 157     if (pc->c0) {
 158         gtk_object_destroy(GTK_OBJECT(pc->c0));
 159         pc->c0 = NULL;
 160     }
 161     if (pc->c1) {
 162         gtk_object_destroy(GTK_OBJECT(pc->c1));
 163         pc->c1 = NULL;
 164     }
 165     if (pc->cl0) {
 166         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 167         pc->cl0 = NULL;
 168     }
 169     if (pc->cl1) {
 170         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 171         pc->cl1 = NULL;
 172     }
 173
 174     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 175 }
 176
 177 /**
 178  * Callback to initialize SPPenContext object.
 179  */
 180 static void
 181 sp_pen_context_setup(SPEventContext *ec)
 182 {
 183     SPPenContext *pc;
 184
 185     pc = SP_PEN_CONTEXT(ec);
 186
 187     if (((SPEventContextClass *) pen_parent_class)->setup) {
 188         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 189     }
 190
 191     /* Pen indicators */
 192     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 193                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 194     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 195                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 196     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 197     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 198     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 199     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 200
 201     sp_canvas_item_hide(pc->c0);
 202     sp_canvas_item_hide(pc->c1);
 203     sp_canvas_item_hide(pc->cl0);
 204     sp_canvas_item_hide(pc->cl1);
 205
 206     sp_event_context_read(ec, "mode");
 207
 208     pc->anchor_statusbar = false;
 209
 210     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 211         ec->enableSelectionCue();
 212     }
 213 }
 214
 215 static void
 216 pen_cancel (SPPenContext *const pc)
 217 {
 218     pc->state = SP_PEN_CONTEXT_STOP;
 219     spdc_reset_colors(pc);
 220     sp_canvas_item_hide(pc->c0);
 221     sp_canvas_item_hide(pc->c1);
 222     sp_canvas_item_hide(pc->cl0);
 223     sp_canvas_item_hide(pc->cl1);
 224     pc->_message_context->clear();
 225     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 226
 227     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 228 }
 229
 230 /**
 231  * Finalization callback.
 232  */
 233 static void
 234 sp_pen_context_finish(SPEventContext *ec)
 235 {
 236     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 237
 238     if (pc->npoints != 0) {
 239         pen_cancel (pc);
 240     }
 241
 242     if (((SPEventContextClass *) pen_parent_class)->finish) {
 243         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 244     }
 245 }
 246
 247 /**
 248  * Callback that sets key to value in pen context.
 249  */
 250 static void
 251 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 252 {
 253     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 254
 255     if (!strcmp(key, "mode")) {
 256         if ( val && !strcmp(val, "drag") ) {
 257             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 258         } else {
 259             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 260         }
 261     }
 262 }
 263
 264 /**
 265  * Snaps new node relative to the previous node.
 266  */
 267 static void
 268 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 269 {
 270     if (pc->npoints > 0) {
 271         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 272     }
 273
 274     spdc_endpoint_snap_free(pc, p, state);
 275 }
 276
 277 /**
 278  * Snaps new node's handle relative to the new node.
 279  */
 280 static void
 281 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 282 {
 283     g_return_if_fail(( pc->npoints == 2 ||
 284                        pc->npoints == 5   ));
 285
 286     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 287     spdc_endpoint_snap_free(pc, p, state);
 288 }
 289
 290 static gint
 291 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 292 {
 293     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 294
 295     gint ret = FALSE;
 296
 297     switch (event->type) {
 298         case GDK_BUTTON_PRESS:
 299             ret = pen_handle_button_press(pc, event->button);
 300             break;
 301         default:
 302             break;
 303     }
 304
 305     if (!ret) {
 306         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 307             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 308     }
 309
 310     return ret;
 311 }
 312
 313 /**
 314  * Callback to handle all pen events.
 315  */
 316 static gint
 317 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 318 {
 319     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 320
 321     gint ret = FALSE;
 322
 323     switch (event->type) {
 324         case GDK_BUTTON_PRESS:
 325             ret = pen_handle_button_press(pc, event->button);
 326             break;
 327
 328         case GDK_MOTION_NOTIFY:
 329             ret = pen_handle_motion_notify(pc, event->motion);
 330             break;
 331
 332         case GDK_BUTTON_RELEASE:
 333             ret = pen_handle_button_release(pc, event->button);
 334             break;
 335
 336         case GDK_2BUTTON_PRESS:
 337             ret = pen_handle_2button_press(pc, event->button);
 338             break;
 339
 340         case GDK_KEY_PRESS:
 341             ret = pen_handle_key_press(pc, event);
 342             break;
 343
 344         default:
 345             break;
 346     }
 347
 348     if (!ret) {
 349         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 350             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 351         if (parent_root_handler) {
 352             ret = parent_root_handler(ec, event);
 353         }
 354     }
 355
 356     return ret;
 357 }
 358
 359 /**
 360  * Handle mouse button press event.
 361  */
 362 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 363 {
 364     if (pc->events_disabled) {
 365         // skip event processing if events are disabled
 366         return FALSE;
 367     }
 368
 369     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 370     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 371     NR::Point const event_w(bevent.x, bevent.y);
 372     NR::Point const event_dt(desktop->w2d(event_w));
 373     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 374
 375     gint ret = FALSE;
 376     if (bevent.button == 1 && !event_context->space_panning) {
 377
 378         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 379             return TRUE;
 380         }
 381
 382         pen_drag_origin_w = event_w;
 383         pen_within_tolerance = true;
 384
 385         /* Test whether we hit any anchor. */
 386         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 387
 388         switch (pc->mode) {
 389             case SP_PEN_CONTEXT_MODE_CLICK:
 390                 /* In click mode we add point on release */
 391                 switch (pc->state) {
 392                     case SP_PEN_CONTEXT_POINT:
 393                     case SP_PEN_CONTEXT_CONTROL:
 394                     case SP_PEN_CONTEXT_CLOSE:
 395                         break;
 396                     case SP_PEN_CONTEXT_STOP:
 397                         /* This is allowed, if we just cancelled curve */
 398                         pc->state = SP_PEN_CONTEXT_POINT;
 399                         break;
 400                     default:
 401                         break;
 402                 }
 403                 break;
 404             case SP_PEN_CONTEXT_MODE_DRAG:
 405                 switch (pc->state) {
 406                     case SP_PEN_CONTEXT_STOP:
 407                         /* This is allowed, if we just cancelled curve */
 408                     case SP_PEN_CONTEXT_POINT:
 409                         if (pc->npoints == 0) {
 410
 411                             /* Set start anchor */
 412                             pc->sa = anchor;
 413                             NR::Point p;
 414                             if (anchor) {
 415
 416                                 /* Adjust point to anchor if needed */
 417                                 p = anchor->dp;
 418                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 419
 420                             } else {
 421
 422                                 // This is the first click of a new curve; deselect item so that
 423                                 // this curve is not combined with it (unless it is drawn from its
 424                                 // anchor, which is handled by the sibling branch above)
 425                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 426                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 427
 428                                     selection->clear();
 429                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 430
 431                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 432
 433                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 434                                 }
 435
 436                                 /* Create green anchor */
 437                                 p = event_dt;
 438                                 spdc_endpoint_snap(pc, p, bevent.state);
 439                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 440                             }
 441                             spdc_pen_set_initial_point(pc, p);
 442                         } else {
 443
 444                             /* Set end anchor */
 445                             pc->ea = anchor;
 446                             NR::Point p;
 447                             if (anchor) {
 448
 449                                 p = anchor->dp;
 450                                 // we hit an anchor, will finish the curve (either with or without closing)
 451                                 // in release handler
 452                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 453
 454                                 if (pc->green_anchor && pc->green_anchor->active) {
 455                                     // we clicked on the current curve start, so close it even if
 456                                     // we drag a handle away from it
 457                                     dc->green_closed = TRUE;
 458                                 }
 459                                 ret = TRUE;
 460                                 break;
 461
 462                             } else {
 463
 464                                 p = event_dt;
 465                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 466                                 spdc_pen_set_subsequent_point(pc, p, true);
 467                             }
 468
 469                         }
 470                         pc->state = SP_PEN_CONTEXT_CONTROL;
 471                         ret = TRUE;
 472                         break;
 473                     case SP_PEN_CONTEXT_CONTROL:
 474                         g_warning("Button down in CONTROL state");
 475                         break;
 476                     case SP_PEN_CONTEXT_CLOSE:
 477                         g_warning("Button down in CLOSE state");
 478                         break;
 479                     default:
 480                         break;
 481                 }
 482                 break;
 483             default:
 484                 break;
 485         }
 486     } else if (bevent.button == 3) {
 487         if (pc->npoints != 0) {
 488
 489             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 490             if (pc->green_closed) {
 491                 // finishing at the start anchor, close curve
 492                 spdc_pen_finish(pc, TRUE);
 493             } else {
 494                 // finishing at some other anchor, finish curve but not close
 495                 spdc_pen_finish(pc, FALSE);
 496             }
 497
 498             ret = TRUE;
 499         }
 500     }
 501
 502     return ret;
 503 }
 504
 505 /**
 506  * Handle motion_notify event.
 507  */
 508 static gint
 509 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 510 {
 511     gint ret = FALSE;
 512
 513     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 514
 515     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 516         // allow scrolling
 517         return FALSE;
 518     }
 519
 520     if (pc->events_disabled) {
 521         // skip motion events if pen events are disabled
 522         return FALSE;
 523     }
 524
 525     NR::Point const event_w(mevent.x,
 526                             mevent.y);
 527     if (pen_within_tolerance) {
 528         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 529                                                                "value", 0, 0, 100);
 530         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 531             return FALSE;   // Do not drag if we're within tolerance from origin.
 532         }
 533     }
 534     // Once the user has moved farther than tolerance from the original location
 535     // (indicating they intend to move the object, not click), then always process the
 536     // motion notify coordinates as given (no snapping back to origin)
 537     pen_within_tolerance = false;
 538
 539     SPDesktop *const dt = pc->desktop;
 540     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 541         /* Grab mouse, so release will not pass unnoticed */
 542         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 543         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 544                                         GDK_BUTTON_RELEASE_MASK |
 545                                         GDK_POINTER_MOTION_MASK  ),
 546                             NULL, mevent.time);
 547     }
 548
 549     /* Find desktop coordinates */
 550     NR::Point p = dt->w2d(event_w);
 551
 552     /* Test, whether we hit any anchor */
 553     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 554
 555     switch (pc->mode) {
 556         case SP_PEN_CONTEXT_MODE_CLICK:
 557             switch (pc->state) {
 558                 case SP_PEN_CONTEXT_POINT:
 559                     if ( pc->npoints != 0 ) {
 560                         /* Only set point, if we are already appending */
 561                         spdc_endpoint_snap(pc, p, mevent.state);
 562                         spdc_pen_set_subsequent_point(pc, p, true);
 563                         ret = TRUE;
 564                     }
 565                     break;
 566                 case SP_PEN_CONTEXT_CONTROL:
 567                 case SP_PEN_CONTEXT_CLOSE:
 568                     /* Placing controls is last operation in CLOSE state */
 569                     spdc_endpoint_snap(pc, p, mevent.state);
 570                     spdc_pen_set_ctrl(pc, p, mevent.state);
 571                     ret = TRUE;
 572                     break;
 573                 case SP_PEN_CONTEXT_STOP:
 574                     /* This is perfectly valid */
 575                     break;
 576                 default:
 577                     break;
 578             }
 579             break;
 580         case SP_PEN_CONTEXT_MODE_DRAG:
 581             switch (pc->state) {
 582                 case SP_PEN_CONTEXT_POINT:
 583                     if ( pc->npoints > 0 ) {
 584                         /* Only set point, if we are already appending */
 585
 586                         if (!anchor) {   /* Snap node only if not hitting anchor */
 587                             spdc_endpoint_snap(pc, p, mevent.state);
 588                         }
 589
 590                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 591
 592                         if (anchor && !pc->anchor_statusbar) {
 593                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 594                             pc->anchor_statusbar = true;
 595                         } else if (!anchor && pc->anchor_statusbar) {
 596                             pc->_message_context->clear();
 597                             pc->anchor_statusbar = false;
 598                         }
 599
 600                         ret = TRUE;
 601                     } else {
 602                         if (anchor && !pc->anchor_statusbar) {
 603                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 604                             pc->anchor_statusbar = true;
 605                         } else if (!anchor && pc->anchor_statusbar) {
 606                             pc->_message_context->clear();
 607                             pc->anchor_statusbar = false;
 608                         }
 609                     }
 610                     break;
 611                 case SP_PEN_CONTEXT_CONTROL:
 612                 case SP_PEN_CONTEXT_CLOSE:
 613                     /* Placing controls is last operation in CLOSE state */
 614
 615                     // snap the handle
 616                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 617
 618                     spdc_pen_set_ctrl(pc, p, mevent.state);
 619                     gobble_motion_events(GDK_BUTTON1_MASK);
 620                     ret = TRUE;
 621                     break;
 622                 case SP_PEN_CONTEXT_STOP:
 623                     /* This is perfectly valid */
 624                     break;
 625                 default:
 626                     break;
 627             }
 628             break;
 629         default:
 630             break;
 631     }
 632     return ret;
 633 }
 634
 635 /**
 636  * Handle mouse button release event.
 637  */
 638 static gint
 639 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 640 {
 641     if (pc->events_disabled) {
 642         // skip event processing if events are disabled
 643         return FALSE;
 644     }
 645
 646     gint ret = FALSE;
 647     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 648     if ( revent.button == 1  && !event_context->space_panning) {
 649
 650         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 651
 652         NR::Point const event_w(revent.x,
 653                                 revent.y);
 654         /* Find desktop coordinates */
 655         NR::Point p = pc->desktop->w2d(event_w);
 656
 657         /* Test whether we hit any anchor. */
 658         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 659
 660         switch (pc->mode) {
 661             case SP_PEN_CONTEXT_MODE_CLICK:
 662                 switch (pc->state) {
 663                     case SP_PEN_CONTEXT_POINT:
 664                         if ( pc->npoints == 0 ) {
 665                             /* Start new thread only with button release */
 666                             if (anchor) {
 667                                 p = anchor->dp;
 668                             }
 669                             pc->sa = anchor;
 670                             spdc_pen_set_initial_point(pc, p);
 671                         } else {
 672                             /* Set end anchor here */
 673                             pc->ea = anchor;
 674                             if (anchor) {
 675                                 p = anchor->dp;
 676                             }
 677                         }
 678                         pc->state = SP_PEN_CONTEXT_CONTROL;
 679                         ret = TRUE;
 680                         break;
 681                     case SP_PEN_CONTEXT_CONTROL:
 682                         /* End current segment */
 683                         spdc_endpoint_snap(pc, p, revent.state);
 684                         spdc_pen_finish_segment(pc, p, revent.state);
 685                         pc->state = SP_PEN_CONTEXT_POINT;
 686                         ret = TRUE;
 687                         break;
 688                     case SP_PEN_CONTEXT_CLOSE:
 689                         /* End current segment */
 690                         if (!anchor) {   /* Snap node only if not hitting anchor */
 691                             spdc_endpoint_snap(pc, p, revent.state);
 692                         }
 693                         spdc_pen_finish_segment(pc, p, revent.state);
 694                         spdc_pen_finish(pc, TRUE);
 695                         pc->state = SP_PEN_CONTEXT_POINT;
 696                         ret = TRUE;
 697                         break;
 698                     case SP_PEN_CONTEXT_STOP:
 699                         /* This is allowed, if we just cancelled curve */
 700                         pc->state = SP_PEN_CONTEXT_POINT;
 701                         ret = TRUE;
 702                         break;
 703                     default:
 704                         break;
 705                 }
 706                 break;
 707             case SP_PEN_CONTEXT_MODE_DRAG:
 708                 switch (pc->state) {
 709                     case SP_PEN_CONTEXT_POINT:
 710                     case SP_PEN_CONTEXT_CONTROL:
 711                         spdc_endpoint_snap(pc, p, revent.state);
 712                         spdc_pen_finish_segment(pc, p, revent.state);
 713                         break;
 714                     case SP_PEN_CONTEXT_CLOSE:
 715                         spdc_endpoint_snap(pc, p, revent.state);
 716                         spdc_pen_finish_segment(pc, p, revent.state);
 717                         if (pc->green_closed) {
 718                             // finishing at the start anchor, close curve
 719                             spdc_pen_finish(pc, TRUE);
 720                         } else {
 721                             // finishing at some other anchor, finish curve but not close
 722                             spdc_pen_finish(pc, FALSE);
 723                         }
 724                         break;
 725                     case SP_PEN_CONTEXT_STOP:
 726                         /* This is allowed, if we just cancelled curve */
 727                         break;
 728                     default:
 729                         break;
 730                 }
 731                 pc->state = SP_PEN_CONTEXT_POINT;
 732                 ret = TRUE;
 733                 break;
 734             default:
 735                 break;
 736         }
 737
 738         if (pc->grab) {
 739             /* Release grab now */
 740             sp_canvas_item_ungrab(pc->grab, revent.time);
 741             pc->grab = NULL;
 742         }
 743
 744         ret = TRUE;
 745
 746         dc->green_closed = FALSE;
 747     }
 748
 749     return ret;
 750 }
 751
 752 static gint
 753 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 754 {
 755     gint ret = FALSE;
 756     if (pc->npoints != 0 && bevent.button != 2) {
 757         spdc_pen_finish(pc, FALSE);
 758         ret = TRUE;
 759     }
 760     return ret;
 761 }
 762
 763 void
 764 pen_redraw_all (SPPenContext *const pc)
 765 {
 766     // green
 767     if (pc->green_bpaths) {
 768         // remove old piecewise green canvasitems
 769         while (pc->green_bpaths) {
 770             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 771             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 772         }
 773         // one canvas bpath for all of green_curve
 774         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 775         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 776         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 777
 778         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 779     }
 780
 781     if (pc->green_anchor)
 782         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 783
 784     sp_curve_reset(pc->red_curve);
 785     sp_curve_moveto(pc->red_curve, pc->p[0]);
 786     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 787     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 788
 789     // handles
 790     if (pc->p[0] != pc->p[1]) {
 791         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 792         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 793         sp_canvas_item_show (pc->c1);
 794         sp_canvas_item_show (pc->cl1);
 795     } else {
 796         sp_canvas_item_hide (pc->c1);
 797         sp_canvas_item_hide (pc->cl1);
 798     }
 799
 800     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 801     if (bpath) {
 802         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 803             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 804             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 805             sp_canvas_item_show (pc->c0);
 806             sp_canvas_item_show (pc->cl0);
 807         } else {
 808             sp_canvas_item_hide (pc->c0);
 809             sp_canvas_item_hide (pc->cl0);
 810         }
 811     }
 812 }
 813
 814 void
 815 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 816 {
 817     if (pc->npoints != 5)
 818         return;
 819
 820     // green
 821     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 822     if (bpath) {
 823         if (bpath->code == NR_CURVETO) {
 824             bpath->x2 += x;
 825             bpath->y2 += y;
 826         }
 827         bpath->x3 += x;
 828         bpath->y3 += y;
 829     } else {
 830         // start anchor too
 831         if (pc->green_anchor) {
 832             pc->green_anchor->dp += NR::Point(x, y);
 833         }
 834     }
 835
 836     // red
 837     pc->p[0] += NR::Point(x, y);
 838     pc->p[1] += NR::Point(x, y);
 839     pen_redraw_all(pc);
 840 }
 841
 842 void
 843 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 844 {
 845     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 846 }
 847
 848 void
 849 pen_lastpoint_tocurve (SPPenContext *const pc)
 850 {
 851     if (pc->npoints != 5)
 852         return;
 853
 854     // red
 855     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 856     if (bpath && bpath->code == NR_CURVETO) {
 857         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 858     } else {
 859         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 860     }
 861
 862     pen_redraw_all(pc);
 863 }
 864
 865 void
 866 pen_lastpoint_toline (SPPenContext *const pc)
 867 {
 868     if (pc->npoints != 5)
 869         return;
 870
 871     pc->p[1] = pc->p[0];
 872
 873     pen_redraw_all(pc);
 874 }
 875
 876
 877 static gint
 878 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 879 {
 880     gint ret = FALSE;
 881     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 882
 883     switch (get_group0_keyval (&event->key)) {
 884
 885         case GDK_Left: // move last point left
 886         case GDK_KP_Left:
 887         case GDK_KP_4:
 888             if (!MOD__CTRL) { // not ctrl
 889                 if (MOD__ALT) { // alt
 890                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 891                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 892                 }
 893                 else { // no alt
 894                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 895                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 896                 }
 897                 ret = TRUE;
 898             }
 899             break;
 900         case GDK_Up: // move last point up
 901         case GDK_KP_Up:
 902         case GDK_KP_8:
 903             if (!MOD__CTRL) { // not ctrl
 904                 if (MOD__ALT) { // alt
 905                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 906                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 907                 }
 908                 else { // no alt
 909                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 910                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 911                 }
 912                 ret = TRUE;
 913             }
 914             break;
 915         case GDK_Right: // move last point right
 916         case GDK_KP_Right:
 917         case GDK_KP_6:
 918             if (!MOD__CTRL) { // not ctrl
 919                 if (MOD__ALT) { // alt
 920                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 921                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 922                 }
 923                 else { // no alt
 924                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 925                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 926                 }
 927                 ret = TRUE;
 928             }
 929             break;
 930         case GDK_Down: // move last point down
 931         case GDK_KP_Down:
 932         case GDK_KP_2:
 933             if (!MOD__CTRL) { // not ctrl
 934                 if (MOD__ALT) { // alt
 935                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 936                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 937                 }
 938                 else { // no alt
 939                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 940                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 941                 }
 942                 ret = TRUE;
 943             }
 944             break;
 945
 946         case GDK_U:
 947         case GDK_u:
 948             if (MOD__SHIFT_ONLY) {
 949                 pen_lastpoint_tocurve(pc);
 950                 ret = TRUE;
 951             }
 952             break;
 953         case GDK_L:
 954         case GDK_l:
 955             if (MOD__SHIFT_ONLY) {
 956                 pen_lastpoint_toline(pc);
 957                 ret = TRUE;
 958             }
 959             break;
 960
 961         case GDK_Return:
 962         case GDK_KP_Enter:
 963             if (pc->npoints != 0) {
 964                 spdc_pen_finish(pc, FALSE);
 965                 ret = TRUE;
 966             }
 967             break;
 968         case GDK_Escape:
 969             if (pc->npoints != 0) {
 970                 // if drawing, cancel, otherwise pass it up for deselecting
 971                 pen_cancel (pc);
 972                 ret = TRUE;
 973             }
 974             break;
 975         case GDK_z:
 976         case GDK_Z:
 977             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 978                 // if drawing, cancel, otherwise pass it up for undo
 979                 pen_cancel (pc);
 980                 ret = TRUE;
 981             }
 982             break;
 983         case GDK_g:
 984         case GDK_G:
 985             if (MOD__SHIFT_ONLY) {
 986                 sp_selection_to_guides();
 987                 ret = true;
 988             }
 989             break;
 990         case GDK_BackSpace:
 991         case GDK_Delete:
 992         case GDK_KP_Delete:
 993             if (sp_curve_is_empty(pc->green_curve)) {
 994                 pen_cancel (pc);
 995                 ret = TRUE;
 996             } else {
 997                 /* Reset red curve */
 998                 sp_curve_reset(pc->red_curve);
 999                 /* Destroy topmost green bpath */
1000                 if (pc->green_bpaths) {
1001                     if (pc->green_bpaths->data)
1002                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1003                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1004                 }
1005                 /* Get last segment */
1006                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1007                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1008                 if ( e < 2 ) {
1009                     g_warning("Green curve length is %d", e);
1010                     break;
1011                 }
1012                 pc->p[0] = p[e - 2].c(3);
1013                 if (p[e - 1].code == NR_CURVETO) {
1014                     pc->p[1] = p[e - 1].c(1);
1015                 } else {
1016                     pc->p[1] = pc->p[0];
1017                 }
1018                 NR::Point const pt(( pc->npoints < 4
1019                                      ? p[e - 1].c(3)
1020                                      : pc->p[3] ));
1021                 pc->npoints = 2;
1022                 sp_curve_backspace(pc->green_curve);
1023                 sp_canvas_item_hide(pc->c0);
1024                 sp_canvas_item_hide(pc->c1);
1025                 sp_canvas_item_hide(pc->cl0);
1026                 sp_canvas_item_hide(pc->cl1);
1027                 pc->state = SP_PEN_CONTEXT_POINT;
1028                 spdc_pen_set_subsequent_point(pc, pt, true);
1029                 ret = TRUE;
1030             }
1031             break;
1032         default:
1033             break;
1034     }
1035     return ret;
1036 }
1037
1038 static void
1039 spdc_reset_colors(SPPenContext *pc)
1040 {
1041     /* Red */
1042     sp_curve_reset(pc->red_curve);
1043     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1044     /* Blue */
1045     sp_curve_reset(pc->blue_curve);
1046     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1047     /* Green */
1048     while (pc->green_bpaths) {
1049         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1050         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1051     }
1052     sp_curve_reset(pc->green_curve);
1053     if (pc->green_anchor) {
1054         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1055     }
1056     pc->sa = NULL;
1057     pc->ea = NULL;
1058     pc->npoints = 0;
1059     pc->red_curve_is_valid = false;
1060 }
1061
1062
1063 static void
1064 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1065 {
1066     g_assert( pc->npoints == 0 );
1067
1068     pc->p[0] = p;
1069     pc->p[1] = p;
1070     pc->npoints = 2;
1071     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1072
1073     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1074 }
1075
1076 static void
1077 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1078 {
1079     g_assert( pc->npoints != 0 );
1080     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1081
1082     pc->p[2] = p;
1083     pc->p[3] = p;
1084     pc->p[4] = p;
1085     pc->npoints = 5;
1086     sp_curve_reset(pc->red_curve);
1087     sp_curve_moveto(pc->red_curve, pc->p[0]);
1088     bool is_curve;
1089     if ( (pc->onlycurves)
1090          || ( pc->p[1] != pc->p[0] ) )
1091     {
1092         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1093         is_curve = true;
1094     } else {
1095         sp_curve_lineto(pc->red_curve, p);
1096         is_curve = false;
1097     }
1098
1099     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1100
1101     if (statusbar) {
1102         // status text
1103         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1104         NR::Point rel = p - pc->p[0];
1105         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1106         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1107         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1108             angle = angle_to_compass (angle);
1109         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);
1110         g_string_free(dist, FALSE);
1111     }
1112 }
1113
1114 static void
1115 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1116 {
1117     sp_canvas_item_show(pc->c1);
1118     sp_canvas_item_show(pc->cl1);
1119
1120     if ( pc->npoints == 2 ) {
1121         pc->p[1] = p;
1122         sp_canvas_item_hide(pc->c0);
1123         sp_canvas_item_hide(pc->cl0);
1124         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1125         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1126
1127         // status text
1128         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1129         NR::Point rel = p - pc->p[0];
1130         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1131         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1132         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1133             angle = angle_to_compass (angle);
1134         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);
1135         g_string_free(dist, FALSE);
1136
1137     } else if ( pc->npoints == 5 ) {
1138         pc->p[4] = p;
1139         sp_canvas_item_show(pc->c0);
1140         sp_canvas_item_show(pc->cl0);
1141         bool is_symm = false;
1142         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1143              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1144             NR::Point delta = p - pc->p[3];
1145             pc->p[2] = pc->p[3] - delta;
1146             is_symm = true;
1147             sp_curve_reset(pc->red_curve);
1148             sp_curve_moveto(pc->red_curve, pc->p[0]);
1149             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1150             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1151         }
1152         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1153         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1154         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1155         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1156
1157         // status text
1158         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1159         NR::Point rel = p - pc->p[3];
1160         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1161         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1162         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1163             angle = angle_to_compass (angle);
1164         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);
1165         g_string_free(dist, FALSE);
1166
1167     } else {
1168         g_warning("Something bad happened - npoints is %d", pc->npoints);
1169     }
1170 }
1171
1172 static void
1173 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1174 {
1175     if (!sp_curve_empty(pc->red_curve)) {
1176         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1177         SPCurve *curve = sp_curve_copy(pc->red_curve);
1178         /// \todo fixme:
1179         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1180         sp_curve_unref(curve);
1181         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1182
1183         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1184
1185         pc->p[0] = pc->p[3];
1186         pc->p[1] = pc->p[4];
1187         pc->npoints = 2;
1188
1189         sp_curve_reset(pc->red_curve);
1190     }
1191 }
1192
1193 static void
1194 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1195 {
1196     pen_disable_events(pc);
1197
1198     SPDesktop *const desktop = pc->desktop;
1199     pc->_message_context->clear();
1200     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1201
1202     sp_curve_reset(pc->red_curve);
1203     spdc_concat_colors_and_flush(pc, closed);
1204     pc->sa = NULL;
1205     pc->ea = NULL;
1206
1207     pc->npoints = 0;
1208     pc->state = SP_PEN_CONTEXT_POINT;
1209
1210     sp_canvas_item_hide(pc->c0);
1211     sp_canvas_item_hide(pc->c1);
1212     sp_canvas_item_hide(pc->cl0);
1213     sp_canvas_item_hide(pc->cl1);
1214
1215     if (pc->green_anchor) {
1216         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1217     }
1218
1219
1220     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1221
1222     pen_enable_events(pc);
1223 }
1224
1225 static void
1226 pen_disable_events(SPPenContext *const pc) {
1227   pc->events_disabled++;
1228 }
1229
1230 static void
1231 pen_enable_events(SPPenContext *const pc) {
1232   g_return_if_fail(pc->events_disabled != 0);
1233
1234   pc->events_disabled--;
1235 }
1236
1237 /*
1238   Local Variables:
1239   mode:c++
1240   c-file-style:"stroustrup"
1241   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1242   indent-tabs-mode:nil
1243   fill-column:99
1244   End:
1245 */
1246 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :