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
 373     gint ret = FALSE;
 374     if (bevent.button == 1) {
 375
 376         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 377             return TRUE;
 378         }
 379
 380         pen_drag_origin_w = event_w;
 381         pen_within_tolerance = true;
 382
 383         /* Test whether we hit any anchor. */
 384         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 385
 386         switch (pc->mode) {
 387             case SP_PEN_CONTEXT_MODE_CLICK:
 388                 /* In click mode we add point on release */
 389                 switch (pc->state) {
 390                     case SP_PEN_CONTEXT_POINT:
 391                     case SP_PEN_CONTEXT_CONTROL:
 392                     case SP_PEN_CONTEXT_CLOSE:
 393                         break;
 394                     case SP_PEN_CONTEXT_STOP:
 395                         /* This is allowed, if we just cancelled curve */
 396                         pc->state = SP_PEN_CONTEXT_POINT;
 397                         break;
 398                     default:
 399                         break;
 400                 }
 401                 break;
 402             case SP_PEN_CONTEXT_MODE_DRAG:
 403                 switch (pc->state) {
 404                     case SP_PEN_CONTEXT_STOP:
 405                         /* This is allowed, if we just cancelled curve */
 406                     case SP_PEN_CONTEXT_POINT:
 407                         if (pc->npoints == 0) {
 408
 409                             /* Set start anchor */
 410                             pc->sa = anchor;
 411                             NR::Point p;
 412                             if (anchor) {
 413
 414                                 /* Adjust point to anchor if needed */
 415                                 p = anchor->dp;
 416                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 417
 418                             } else {
 419
 420                                 // This is the first click of a new curve; deselect item so that
 421                                 // this curve is not combined with it (unless it is drawn from its
 422                                 // anchor, which is handled by the sibling branch above)
 423                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 424                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 425
 426                                     selection->clear();
 427                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 428
 429                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 430
 431                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 432                                 }
 433
 434                                 /* Create green anchor */
 435                                 p = event_dt;
 436                                 spdc_endpoint_snap(pc, p, bevent.state);
 437                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 438                             }
 439                             spdc_pen_set_initial_point(pc, p);
 440                         } else {
 441
 442                             /* Set end anchor */
 443                             pc->ea = anchor;
 444                             NR::Point p;
 445                             if (anchor) {
 446
 447                                 p = anchor->dp;
 448                                 // we hit an anchor, will finish the curve (either with or without closing)
 449                                 // in release handler
 450                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 451
 452                                 if (pc->green_anchor && pc->green_anchor->active) {
 453                                     // we clicked on the current curve start, so close it even if
 454                                     // we drag a handle away from it
 455                                     dc->green_closed = TRUE;
 456                                 }
 457                                 ret = TRUE;
 458                                 break;
 459
 460                             } else {
 461
 462                                 p = event_dt;
 463                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 464                                 spdc_pen_set_subsequent_point(pc, p, true);
 465                             }
 466
 467                         }
 468                         pc->state = SP_PEN_CONTEXT_CONTROL;
 469                         ret = TRUE;
 470                         break;
 471                     case SP_PEN_CONTEXT_CONTROL:
 472                         g_warning("Button down in CONTROL state");
 473                         break;
 474                     case SP_PEN_CONTEXT_CLOSE:
 475                         g_warning("Button down in CLOSE state");
 476                         break;
 477                     default:
 478                         break;
 479                 }
 480                 break;
 481             default:
 482                 break;
 483         }
 484     } else if (bevent.button == 3) {
 485         if (pc->npoints != 0) {
 486
 487             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 488             if (pc->green_closed) {
 489                 // finishing at the start anchor, close curve
 490                 spdc_pen_finish(pc, TRUE);
 491             } else {
 492                 // finishing at some other anchor, finish curve but not close
 493                 spdc_pen_finish(pc, FALSE);
 494             }
 495
 496             ret = TRUE;
 497         }
 498     }
 499
 500     return ret;
 501 }
 502
 503 /**
 504  * Handle motion_notify event.
 505  */
 506 static gint
 507 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 508 {
 509     gint ret = FALSE;
 510
 511     if (mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 512         // allow middle-button scrolling
 513         return FALSE;
 514     }
 515
 516     if (pc->events_disabled) {
 517         // skip motion events if pen events are disabled
 518         return FALSE;
 519     }
 520
 521     NR::Point const event_w(mevent.x,
 522                             mevent.y);
 523     if (pen_within_tolerance) {
 524         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 525                                                                "value", 0, 0, 100);
 526         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 527             return FALSE;   // Do not drag if we're within tolerance from origin.
 528         }
 529     }
 530     // Once the user has moved farther than tolerance from the original location
 531     // (indicating they intend to move the object, not click), then always process the
 532     // motion notify coordinates as given (no snapping back to origin)
 533     pen_within_tolerance = false;
 534
 535     SPDesktop *const dt = pc->desktop;
 536     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 537         /* Grab mouse, so release will not pass unnoticed */
 538         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 539         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 540                                         GDK_BUTTON_RELEASE_MASK |
 541                                         GDK_POINTER_MOTION_MASK  ),
 542                             NULL, mevent.time);
 543     }
 544
 545     /* Find desktop coordinates */
 546     NR::Point p = dt->w2d(event_w);
 547
 548     /* Test, whether we hit any anchor */
 549     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 550
 551     switch (pc->mode) {
 552         case SP_PEN_CONTEXT_MODE_CLICK:
 553             switch (pc->state) {
 554                 case SP_PEN_CONTEXT_POINT:
 555                     if ( pc->npoints != 0 ) {
 556                         /* Only set point, if we are already appending */
 557                         spdc_endpoint_snap(pc, p, mevent.state);
 558                         spdc_pen_set_subsequent_point(pc, p, true);
 559                         ret = TRUE;
 560                     }
 561                     break;
 562                 case SP_PEN_CONTEXT_CONTROL:
 563                 case SP_PEN_CONTEXT_CLOSE:
 564                     /* Placing controls is last operation in CLOSE state */
 565                     spdc_endpoint_snap(pc, p, mevent.state);
 566                     spdc_pen_set_ctrl(pc, p, mevent.state);
 567                     ret = TRUE;
 568                     break;
 569                 case SP_PEN_CONTEXT_STOP:
 570                     /* This is perfectly valid */
 571                     break;
 572                 default:
 573                     break;
 574             }
 575             break;
 576         case SP_PEN_CONTEXT_MODE_DRAG:
 577             switch (pc->state) {
 578                 case SP_PEN_CONTEXT_POINT:
 579                     if ( pc->npoints > 0 ) {
 580                         /* Only set point, if we are already appending */
 581
 582                         if (!anchor) {   /* Snap node only if not hitting anchor */
 583                             spdc_endpoint_snap(pc, p, mevent.state);
 584                         }
 585
 586                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 587
 588                         if (anchor && !pc->anchor_statusbar) {
 589                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 590                             pc->anchor_statusbar = true;
 591                         } else if (!anchor && pc->anchor_statusbar) {
 592                             pc->_message_context->clear();
 593                             pc->anchor_statusbar = false;
 594                         }
 595
 596                         ret = TRUE;
 597                     } else {
 598                         if (anchor && !pc->anchor_statusbar) {
 599                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 600                             pc->anchor_statusbar = true;
 601                         } else if (!anchor && pc->anchor_statusbar) {
 602                             pc->_message_context->clear();
 603                             pc->anchor_statusbar = false;
 604                         }
 605                     }
 606                     break;
 607                 case SP_PEN_CONTEXT_CONTROL:
 608                 case SP_PEN_CONTEXT_CLOSE:
 609                     /* Placing controls is last operation in CLOSE state */
 610
 611                     // snap the handle
 612                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 613
 614                     spdc_pen_set_ctrl(pc, p, mevent.state);
 615                     ret = TRUE;
 616                     break;
 617                 case SP_PEN_CONTEXT_STOP:
 618                     /* This is perfectly valid */
 619                     break;
 620                 default:
 621                     break;
 622             }
 623             break;
 624         default:
 625             break;
 626     }
 627     return ret;
 628 }
 629
 630 /**
 631  * Handle mouse button release event.
 632  */
 633 static gint
 634 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 635 {
 636     if (pc->events_disabled) {
 637         // skip event processing if events are disabled
 638         return FALSE;
 639     }
 640
 641     gint ret = FALSE;
 642     if ( revent.button == 1 ) {
 643
 644         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 645
 646         NR::Point const event_w(revent.x,
 647                                 revent.y);
 648         /* Find desktop coordinates */
 649         NR::Point p = pc->desktop->w2d(event_w);
 650
 651         /* Test whether we hit any anchor. */
 652         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 653
 654         switch (pc->mode) {
 655             case SP_PEN_CONTEXT_MODE_CLICK:
 656                 switch (pc->state) {
 657                     case SP_PEN_CONTEXT_POINT:
 658                         if ( pc->npoints == 0 ) {
 659                             /* Start new thread only with button release */
 660                             if (anchor) {
 661                                 p = anchor->dp;
 662                             }
 663                             pc->sa = anchor;
 664                             spdc_pen_set_initial_point(pc, p);
 665                         } else {
 666                             /* Set end anchor here */
 667                             pc->ea = anchor;
 668                             if (anchor) {
 669                                 p = anchor->dp;
 670                             }
 671                         }
 672                         pc->state = SP_PEN_CONTEXT_CONTROL;
 673                         ret = TRUE;
 674                         break;
 675                     case SP_PEN_CONTEXT_CONTROL:
 676                         /* End current segment */
 677                         spdc_endpoint_snap(pc, p, revent.state);
 678                         spdc_pen_finish_segment(pc, p, revent.state);
 679                         pc->state = SP_PEN_CONTEXT_POINT;
 680                         ret = TRUE;
 681                         break;
 682                     case SP_PEN_CONTEXT_CLOSE:
 683                         /* End current segment */
 684                         if (!anchor) {   /* Snap node only if not hitting anchor */
 685                             spdc_endpoint_snap(pc, p, revent.state);
 686                         }
 687                         spdc_pen_finish_segment(pc, p, revent.state);
 688                         spdc_pen_finish(pc, TRUE);
 689                         pc->state = SP_PEN_CONTEXT_POINT;
 690                         ret = TRUE;
 691                         break;
 692                     case SP_PEN_CONTEXT_STOP:
 693                         /* This is allowed, if we just cancelled curve */
 694                         pc->state = SP_PEN_CONTEXT_POINT;
 695                         ret = TRUE;
 696                         break;
 697                     default:
 698                         break;
 699                 }
 700                 break;
 701             case SP_PEN_CONTEXT_MODE_DRAG:
 702                 switch (pc->state) {
 703                     case SP_PEN_CONTEXT_POINT:
 704                     case SP_PEN_CONTEXT_CONTROL:
 705                         spdc_endpoint_snap(pc, p, revent.state);
 706                         spdc_pen_finish_segment(pc, p, revent.state);
 707                         break;
 708                     case SP_PEN_CONTEXT_CLOSE:
 709                         spdc_endpoint_snap(pc, p, revent.state);
 710                         spdc_pen_finish_segment(pc, p, revent.state);
 711                         if (pc->green_closed) {
 712                             // finishing at the start anchor, close curve
 713                             spdc_pen_finish(pc, TRUE);
 714                         } else {
 715                             // finishing at some other anchor, finish curve but not close
 716                             spdc_pen_finish(pc, FALSE);
 717                         }
 718                         break;
 719                     case SP_PEN_CONTEXT_STOP:
 720                         /* This is allowed, if we just cancelled curve */
 721                         break;
 722                     default:
 723                         break;
 724                 }
 725                 pc->state = SP_PEN_CONTEXT_POINT;
 726                 ret = TRUE;
 727                 break;
 728             default:
 729                 break;
 730         }
 731
 732         if (pc->grab) {
 733             /* Release grab now */
 734             sp_canvas_item_ungrab(pc->grab, revent.time);
 735             pc->grab = NULL;
 736         }
 737
 738         ret = TRUE;
 739
 740         dc->green_closed = FALSE;
 741     }
 742
 743     return ret;
 744 }
 745
 746 static gint
 747 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 748 {
 749     gint ret = FALSE;
 750     if (pc->npoints != 0 && bevent.button != 2) {
 751         spdc_pen_finish(pc, FALSE);
 752         ret = TRUE;
 753     }
 754     return ret;
 755 }
 756
 757 void
 758 pen_redraw_all (SPPenContext *const pc)
 759 {
 760     // green
 761     if (pc->green_bpaths) {
 762         // remove old piecewise green canvasitems
 763         while (pc->green_bpaths) {
 764             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 765             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 766         }
 767         // one canvas bpath for all of green_curve
 768         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 769         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 770         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 771
 772         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 773     }
 774
 775     if (pc->green_anchor)
 776         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 777
 778     sp_curve_reset(pc->red_curve);
 779     sp_curve_moveto(pc->red_curve, pc->p[0]);
 780     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 781     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 782
 783     // handles
 784     if (pc->p[0] != pc->p[1]) {
 785         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 786         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 787         sp_canvas_item_show (pc->c1);
 788         sp_canvas_item_show (pc->cl1);
 789     } else {
 790         sp_canvas_item_hide (pc->c1);
 791         sp_canvas_item_hide (pc->cl1);
 792     }
 793
 794     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 795     if (bpath) {
 796         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 797             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 798             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 799             sp_canvas_item_show (pc->c0);
 800             sp_canvas_item_show (pc->cl0);
 801         } else {
 802             sp_canvas_item_hide (pc->c0);
 803             sp_canvas_item_hide (pc->cl0);
 804         }
 805     }
 806 }
 807
 808 void
 809 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 810 {
 811     if (pc->npoints != 5)
 812         return;
 813
 814     // green
 815     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 816     if (bpath) {
 817         if (bpath->code == NR_CURVETO) {
 818             bpath->x2 += x;
 819             bpath->y2 += y;
 820         }
 821         bpath->x3 += x;
 822         bpath->y3 += y;
 823     } else {
 824         // start anchor too
 825         if (pc->green_anchor) {
 826             pc->green_anchor->dp += NR::Point(x, y);
 827         }
 828     }
 829
 830     // red
 831     pc->p[0] += NR::Point(x, y);
 832     pc->p[1] += NR::Point(x, y);
 833     pen_redraw_all(pc);
 834 }
 835
 836 void
 837 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 838 {
 839     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 840 }
 841
 842 void
 843 pen_lastpoint_tocurve (SPPenContext *const pc)
 844 {
 845     if (pc->npoints != 5)
 846         return;
 847
 848     // red
 849     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 850     if (bpath && bpath->code == NR_CURVETO) {
 851         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 852     } else {
 853         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 854     }
 855
 856     pen_redraw_all(pc);
 857 }
 858
 859 void
 860 pen_lastpoint_toline (SPPenContext *const pc)
 861 {
 862     if (pc->npoints != 5)
 863         return;
 864
 865     pc->p[1] = pc->p[0];
 866
 867     pen_redraw_all(pc);
 868 }
 869
 870
 871 static gint
 872 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 873 {
 874     gint ret = FALSE;
 875     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 876
 877     switch (get_group0_keyval (&event->key)) {
 878
 879         case GDK_Left: // move last point left
 880         case GDK_KP_Left:
 881         case GDK_KP_4:
 882             if (!MOD__CTRL) { // not ctrl
 883                 if (MOD__ALT) { // alt
 884                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 885                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 886                 }
 887                 else { // no alt
 888                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 889                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 890                 }
 891                 ret = TRUE;
 892             }
 893             break;
 894         case GDK_Up: // move last point up
 895         case GDK_KP_Up:
 896         case GDK_KP_8:
 897             if (!MOD__CTRL) { // not ctrl
 898                 if (MOD__ALT) { // alt
 899                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 900                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 901                 }
 902                 else { // no alt
 903                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 904                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 905                 }
 906                 ret = TRUE;
 907             }
 908             break;
 909         case GDK_Right: // move last point right
 910         case GDK_KP_Right:
 911         case GDK_KP_6:
 912             if (!MOD__CTRL) { // not ctrl
 913                 if (MOD__ALT) { // alt
 914                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 915                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 916                 }
 917                 else { // no alt
 918                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 919                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 920                 }
 921                 ret = TRUE;
 922             }
 923             break;
 924         case GDK_Down: // move last point down
 925         case GDK_KP_Down:
 926         case GDK_KP_2:
 927             if (!MOD__CTRL) { // not ctrl
 928                 if (MOD__ALT) { // alt
 929                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 930                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 931                 }
 932                 else { // no alt
 933                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 934                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 935                 }
 936                 ret = TRUE;
 937             }
 938             break;
 939
 940         case GDK_U:
 941         case GDK_u:
 942             if (MOD__SHIFT_ONLY) {
 943                 pen_lastpoint_tocurve(pc);
 944                 ret = TRUE;
 945             }
 946             break;
 947         case GDK_L:
 948         case GDK_l:
 949             if (MOD__SHIFT_ONLY) {
 950                 pen_lastpoint_toline(pc);
 951                 ret = TRUE;
 952             }
 953             break;
 954
 955         case GDK_Return:
 956         case GDK_KP_Enter:
 957             if (pc->npoints != 0) {
 958                 spdc_pen_finish(pc, FALSE);
 959                 ret = TRUE;
 960             }
 961             break;
 962         case GDK_Escape:
 963             if (pc->npoints != 0) {
 964                 // if drawing, cancel, otherwise pass it up for deselecting
 965                 pen_cancel (pc);
 966                 ret = TRUE;
 967             }
 968             break;
 969         case GDK_z:
 970         case GDK_Z:
 971             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 972                 // if drawing, cancel, otherwise pass it up for undo
 973                 pen_cancel (pc);
 974                 ret = TRUE;
 975             }
 976             break;
 977         case GDK_BackSpace:
 978         case GDK_Delete:
 979         case GDK_KP_Delete:
 980             if (sp_curve_is_empty(pc->green_curve)) {
 981                 pen_cancel (pc);
 982                 ret = TRUE;
 983             } else {
 984                 /* Reset red curve */
 985                 sp_curve_reset(pc->red_curve);
 986                 /* Destroy topmost green bpath */
 987                 if (pc->green_bpaths) {
 988                     if (pc->green_bpaths->data)
 989                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 990                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 991                 }
 992                 /* Get last segment */
 993                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
 994                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
 995                 if ( e < 2 ) {
 996                     g_warning("Green curve length is %d", e);
 997                     break;
 998                 }
 999                 pc->p[0] = p[e - 2].c(3);
1000                 if (p[e - 1].code == NR_CURVETO) {
1001                     pc->p[1] = p[e - 1].c(1);
1002                 } else {
1003                     pc->p[1] = pc->p[0];
1004                 }
1005                 NR::Point const pt(( pc->npoints < 4
1006                                      ? p[e - 1].c(3)
1007                                      : pc->p[3] ));
1008                 pc->npoints = 2;
1009                 sp_curve_backspace(pc->green_curve);
1010                 sp_canvas_item_hide(pc->c0);
1011                 sp_canvas_item_hide(pc->c1);
1012                 sp_canvas_item_hide(pc->cl0);
1013                 sp_canvas_item_hide(pc->cl1);
1014                 pc->state = SP_PEN_CONTEXT_POINT;
1015                 spdc_pen_set_subsequent_point(pc, pt, true);
1016                 ret = TRUE;
1017             }
1018             break;
1019         default:
1020             break;
1021     }
1022     return ret;
1023 }
1024
1025 static void
1026 spdc_reset_colors(SPPenContext *pc)
1027 {
1028     /* Red */
1029     sp_curve_reset(pc->red_curve);
1030     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1031     /* Blue */
1032     sp_curve_reset(pc->blue_curve);
1033     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1034     /* Green */
1035     while (pc->green_bpaths) {
1036         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1037         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1038     }
1039     sp_curve_reset(pc->green_curve);
1040     if (pc->green_anchor) {
1041         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1042     }
1043     pc->sa = NULL;
1044     pc->ea = NULL;
1045     pc->npoints = 0;
1046     pc->red_curve_is_valid = false;
1047 }
1048
1049
1050 static void
1051 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1052 {
1053     g_assert( pc->npoints == 0 );
1054
1055     pc->p[0] = p;
1056     pc->p[1] = p;
1057     pc->npoints = 2;
1058     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1059
1060     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1061 }
1062
1063 static void
1064 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1065 {
1066     g_assert( pc->npoints != 0 );
1067     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1068
1069     pc->p[2] = p;
1070     pc->p[3] = p;
1071     pc->p[4] = p;
1072     pc->npoints = 5;
1073     sp_curve_reset(pc->red_curve);
1074     sp_curve_moveto(pc->red_curve, pc->p[0]);
1075     bool is_curve;
1076     if ( (pc->onlycurves)
1077          || ( pc->p[1] != pc->p[0] ) )
1078     {
1079         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1080         is_curve = true;
1081     } else {
1082         sp_curve_lineto(pc->red_curve, p);
1083         is_curve = false;
1084     }
1085
1086     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1087
1088     if (statusbar) {
1089         // status text
1090         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1091         NR::Point rel = p - pc->p[0];
1092         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1093         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1094         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1095             angle = angle_to_compass (angle);
1096         pc->_message_context->setF(Inkscape::NORMAL_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);
1097         g_string_free(dist, FALSE);
1098     }
1099 }
1100
1101 static void
1102 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1103 {
1104     sp_canvas_item_show(pc->c1);
1105     sp_canvas_item_show(pc->cl1);
1106
1107     if ( pc->npoints == 2 ) {
1108         pc->p[1] = p;
1109         sp_canvas_item_hide(pc->c0);
1110         sp_canvas_item_hide(pc->cl0);
1111         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1112         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1113
1114         // status text
1115         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1116         NR::Point rel = p - pc->p[0];
1117         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1118         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1119         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1120             angle = angle_to_compass (angle);
1121         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1122         g_string_free(dist, FALSE);
1123
1124     } else if ( pc->npoints == 5 ) {
1125         pc->p[4] = p;
1126         sp_canvas_item_show(pc->c0);
1127         sp_canvas_item_show(pc->cl0);
1128         bool is_symm = false;
1129         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1130              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1131             NR::Point delta = p - pc->p[3];
1132             pc->p[2] = pc->p[3] - delta;
1133             is_symm = true;
1134             sp_curve_reset(pc->red_curve);
1135             sp_curve_moveto(pc->red_curve, pc->p[0]);
1136             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1137             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1138         }
1139         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1140         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1141         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1142         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1143
1144         // status text
1145         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1146         NR::Point rel = p - pc->p[3];
1147         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1148         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1149         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1150             angle = angle_to_compass (angle);
1151         pc->_message_context->setF(Inkscape::NORMAL_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);
1152         g_string_free(dist, FALSE);
1153
1154     } else {
1155         g_warning("Something bad happened - npoints is %d", pc->npoints);
1156     }
1157 }
1158
1159 static void
1160 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1161 {
1162     if (!sp_curve_empty(pc->red_curve)) {
1163         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1164         SPCurve *curve = sp_curve_copy(pc->red_curve);
1165         /// \todo fixme:
1166         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1167         sp_curve_unref(curve);
1168         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1169
1170         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1171
1172         pc->p[0] = pc->p[3];
1173         pc->p[1] = pc->p[4];
1174         pc->npoints = 2;
1175
1176         sp_curve_reset(pc->red_curve);
1177     }
1178 }
1179
1180 static void
1181 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1182 {
1183     pen_disable_events(pc);
1184
1185     SPDesktop *const desktop = pc->desktop;
1186     pc->_message_context->clear();
1187     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1188
1189     sp_curve_reset(pc->red_curve);
1190     spdc_concat_colors_and_flush(pc, closed);
1191     pc->sa = NULL;
1192     pc->ea = NULL;
1193
1194     pc->npoints = 0;
1195     pc->state = SP_PEN_CONTEXT_POINT;
1196
1197     sp_canvas_item_hide(pc->c0);
1198     sp_canvas_item_hide(pc->c1);
1199     sp_canvas_item_hide(pc->cl0);
1200     sp_canvas_item_hide(pc->cl1);
1201
1202     if (pc->green_anchor) {
1203         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1204     }
1205
1206
1207     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1208
1209     pen_enable_events(pc);
1210 }
1211
1212 static void
1213 pen_disable_events(SPPenContext *const pc) {
1214   pc->events_disabled++;
1215 }
1216
1217 static void
1218 pen_enable_events(SPPenContext *const pc) {
1219   g_return_if_fail(pc->events_disabled != 0);
1220
1221   pc->events_disabled--;
1222 }
1223
1224 /*
1225   Local Variables:
1226   mode:c++
1227   c-file-style:"stroustrup"
1228   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1229   indent-tabs-mode:nil
1230   fill-column:99
1231   End:
1232 */
1233 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :