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 #include <cstring>
  20 #include <string>
  21
  22 #include "pen-context.h"
  23 #include "sp-namedview.h"
  24 #include "sp-metrics.h"
  25 #include "desktop.h"
  26 #include "desktop-handles.h"
  27 #include "selection.h"
  28 #include "selection-chemistry.h"
  29 #include "draw-anchor.h"
  30 #include "message-stack.h"
  31 #include "message-context.h"
  32 #include "prefs-utils.h"
  33 #include "sp-path.h"
  34 #include "display/curve.h"
  35 #include "pixmaps/cursor-pen.xpm"
  36 #include "display/canvas-bpath.h"
  37 #include "display/sp-ctrlline.h"
  38 #include "display/sodipodi-ctrl.h"
  39 #include <glibmm/i18n.h>
  40 #include "libnr/n-art-bpath.h"
  41 #include "libnr/nr-point-ops.h"
  42 #include "helper/units.h"
  43 #include "macros.h"
  44 #include "context-fns.h"
  45
  46
  47 static void sp_pen_context_class_init(SPPenContextClass *klass);
  48 static void sp_pen_context_init(SPPenContext *pc);
  49 static void sp_pen_context_dispose(GObject *object);
  50
  51 static void sp_pen_context_setup(SPEventContext *ec);
  52 static void sp_pen_context_finish(SPEventContext *ec);
  53 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  54 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  55 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  56
  57 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  58 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  59 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  60 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  61
  62 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  63
  64 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  65 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  66 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  67 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  68 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  69 static void spdc_reset_colors(SPPenContext *pc);
  70
  71 static void pen_disable_events(SPPenContext *const pc);
  72 static void pen_enable_events(SPPenContext *const pc);
  73
  74 static NR::Point pen_drag_origin_w(0, 0);
  75 static bool pen_within_tolerance = false;
  76
  77 static SPDrawContextClass *pen_parent_class;
  78
  79 /**
  80  * Register SPPenContext with Gdk and return its type.
  81  */
  82 GType
  83 sp_pen_context_get_type(void)
  84 {
  85     static GType type = 0;
  86     if (!type) {
  87         GTypeInfo info = {
  88             sizeof(SPPenContextClass),
  89             NULL, NULL,
  90             (GClassInitFunc) sp_pen_context_class_init,
  91             NULL, NULL,
  92             sizeof(SPPenContext),
  93             4,
  94             (GInstanceInitFunc) sp_pen_context_init,
  95             NULL,   /* value_table */
  96         };
  97         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  98     }
  99     return type;
 100 }
 101
 102 /**
 103  * Initialize the SPPenContext vtable.
 104  */
 105 static void
 106 sp_pen_context_class_init(SPPenContextClass *klass)
 107 {
 108     GObjectClass *object_class;
 109     SPEventContextClass *event_context_class;
 110
 111     object_class = (GObjectClass *) klass;
 112     event_context_class = (SPEventContextClass *) klass;
 113
 114     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 115
 116     object_class->dispose = sp_pen_context_dispose;
 117
 118     event_context_class->setup = sp_pen_context_setup;
 119     event_context_class->finish = sp_pen_context_finish;
 120     event_context_class->set = sp_pen_context_set;
 121     event_context_class->root_handler = sp_pen_context_root_handler;
 122     event_context_class->item_handler = sp_pen_context_item_handler;
 123 }
 124
 125 /**
 126  * Callback to initialize SPPenContext object.
 127  */
 128 static void
 129 sp_pen_context_init(SPPenContext *pc)
 130 {
 131
 132     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 133
 134     event_context->cursor_shape = cursor_pen_xpm;
 135     event_context->hot_x = 4;
 136     event_context->hot_y = 4;
 137
 138     pc->npoints = 0;
 139     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 140     pc->state = SP_PEN_CONTEXT_POINT;
 141
 142     pc->c0 = NULL;
 143     pc->c1 = NULL;
 144     pc->cl0 = NULL;
 145     pc->cl1 = NULL;
 146
 147     pc->events_disabled = 0;
 148 }
 149
 150 /**
 151  * Callback to destroy the SPPenContext object's members and itself.
 152  */
 153 static void
 154 sp_pen_context_dispose(GObject *object)
 155 {
 156     SPPenContext *pc;
 157
 158     pc = SP_PEN_CONTEXT(object);
 159
 160     if (pc->c0) {
 161         gtk_object_destroy(GTK_OBJECT(pc->c0));
 162         pc->c0 = NULL;
 163     }
 164     if (pc->c1) {
 165         gtk_object_destroy(GTK_OBJECT(pc->c1));
 166         pc->c1 = NULL;
 167     }
 168     if (pc->cl0) {
 169         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 170         pc->cl0 = NULL;
 171     }
 172     if (pc->cl1) {
 173         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 174         pc->cl1 = NULL;
 175     }
 176
 177     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 178 }
 179
 180 /**
 181  * Callback to initialize SPPenContext object.
 182  */
 183 static void
 184 sp_pen_context_setup(SPEventContext *ec)
 185 {
 186     SPPenContext *pc;
 187
 188     pc = SP_PEN_CONTEXT(ec);
 189
 190     if (((SPEventContextClass *) pen_parent_class)->setup) {
 191         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 192     }
 193
 194     /* Pen indicators */
 195     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 196                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 197     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 198                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 199     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 200     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 201     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 202     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 203
 204     sp_canvas_item_hide(pc->c0);
 205     sp_canvas_item_hide(pc->c1);
 206     sp_canvas_item_hide(pc->cl0);
 207     sp_canvas_item_hide(pc->cl1);
 208
 209     sp_event_context_read(ec, "mode");
 210
 211     pc->anchor_statusbar = false;
 212
 213     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 214         ec->enableSelectionCue();
 215     }
 216 }
 217
 218 static void
 219 pen_cancel (SPPenContext *const pc)
 220 {
 221     pc->state = SP_PEN_CONTEXT_STOP;
 222     spdc_reset_colors(pc);
 223     sp_canvas_item_hide(pc->c0);
 224     sp_canvas_item_hide(pc->c1);
 225     sp_canvas_item_hide(pc->cl0);
 226     sp_canvas_item_hide(pc->cl1);
 227     pc->_message_context->clear();
 228     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 229
 230     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 231 }
 232
 233 /**
 234  * Finalization callback.
 235  */
 236 static void
 237 sp_pen_context_finish(SPEventContext *ec)
 238 {
 239     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 240
 241     if (pc->npoints != 0) {
 242         pen_cancel (pc);
 243     }
 244
 245     if (((SPEventContextClass *) pen_parent_class)->finish) {
 246         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 247     }
 248 }
 249
 250 /**
 251  * Callback that sets key to value in pen context.
 252  */
 253 static void
 254 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 255 {
 256     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 257
 258     if (!strcmp(key, "mode")) {
 259         if ( val && !strcmp(val, "drag") ) {
 260             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 261         } else {
 262             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 263         }
 264     }
 265 }
 266
 267 /**
 268  * Snaps new node relative to the previous node.
 269  */
 270 static void
 271 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 272 {
 273     if (pc->npoints > 0) {
 274         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 275     }
 276
 277     spdc_endpoint_snap_free(pc, p, state);
 278 }
 279
 280 /**
 281  * Snaps new node's handle relative to the new node.
 282  */
 283 static void
 284 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 285 {
 286     g_return_if_fail(( pc->npoints == 2 ||
 287                        pc->npoints == 5   ));
 288
 289     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 290     spdc_endpoint_snap_free(pc, p, state);
 291 }
 292
 293 static gint
 294 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 295 {
 296     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 297
 298     gint ret = FALSE;
 299
 300     switch (event->type) {
 301         case GDK_BUTTON_PRESS:
 302             ret = pen_handle_button_press(pc, event->button);
 303             break;
 304         default:
 305             break;
 306     }
 307
 308     if (!ret) {
 309         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 310             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 311     }
 312
 313     return ret;
 314 }
 315
 316 /**
 317  * Callback to handle all pen events.
 318  */
 319 static gint
 320 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 321 {
 322     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 323
 324     gint ret = FALSE;
 325
 326     switch (event->type) {
 327         case GDK_BUTTON_PRESS:
 328             ret = pen_handle_button_press(pc, event->button);
 329             break;
 330
 331         case GDK_MOTION_NOTIFY:
 332             ret = pen_handle_motion_notify(pc, event->motion);
 333             break;
 334
 335         case GDK_BUTTON_RELEASE:
 336             ret = pen_handle_button_release(pc, event->button);
 337             break;
 338
 339         case GDK_2BUTTON_PRESS:
 340             ret = pen_handle_2button_press(pc, event->button);
 341             break;
 342
 343         case GDK_KEY_PRESS:
 344             ret = pen_handle_key_press(pc, event);
 345             break;
 346
 347         default:
 348             break;
 349     }
 350
 351     if (!ret) {
 352         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 353             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 354         if (parent_root_handler) {
 355             ret = parent_root_handler(ec, event);
 356         }
 357     }
 358
 359     return ret;
 360 }
 361
 362 /**
 363  * Handle mouse button press event.
 364  */
 365 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 366 {
 367     if (pc->events_disabled) {
 368         // skip event processing if events are disabled
 369         return FALSE;
 370     }
 371
 372     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 373     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 374     NR::Point const event_w(bevent.x, bevent.y);
 375     NR::Point const event_dt(desktop->w2d(event_w));
 376     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 377
 378     gint ret = FALSE;
 379     if (bevent.button == 1 && !event_context->space_panning) {
 380
 381         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 382             return TRUE;
 383         }
 384
 385         pen_drag_origin_w = event_w;
 386         pen_within_tolerance = true;
 387
 388         /* Test whether we hit any anchor. */
 389         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 390
 391         switch (pc->mode) {
 392             case SP_PEN_CONTEXT_MODE_CLICK:
 393                 /* In click mode we add point on release */
 394                 switch (pc->state) {
 395                     case SP_PEN_CONTEXT_POINT:
 396                     case SP_PEN_CONTEXT_CONTROL:
 397                     case SP_PEN_CONTEXT_CLOSE:
 398                         break;
 399                     case SP_PEN_CONTEXT_STOP:
 400                         /* This is allowed, if we just cancelled curve */
 401                         pc->state = SP_PEN_CONTEXT_POINT;
 402                         break;
 403                     default:
 404                         break;
 405                 }
 406                 break;
 407             case SP_PEN_CONTEXT_MODE_DRAG:
 408                 switch (pc->state) {
 409                     case SP_PEN_CONTEXT_STOP:
 410                         /* This is allowed, if we just cancelled curve */
 411                     case SP_PEN_CONTEXT_POINT:
 412                         if (pc->npoints == 0) {
 413
 414                             if (bevent.state & GDK_CONTROL_MASK) {
 415                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 416                                 ret = TRUE;
 417                                 break;
 418                             }
 419
 420                             /* Set start anchor */
 421                             pc->sa = anchor;
 422                             NR::Point p;
 423                             if (anchor) {
 424
 425                                 /* Adjust point to anchor if needed */
 426                                 p = anchor->dp;
 427                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 428
 429                             } else {
 430
 431                                 // This is the first click of a new curve; deselect item so that
 432                                 // this curve is not combined with it (unless it is drawn from its
 433                                 // anchor, which is handled by the sibling branch above)
 434                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 435                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 436
 437                                     selection->clear();
 438                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 439
 440                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 441
 442                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 443                                 }
 444
 445                                 /* Create green anchor */
 446                                 p = event_dt;
 447                                 spdc_endpoint_snap(pc, p, bevent.state);
 448                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 449                             }
 450                             spdc_pen_set_initial_point(pc, p);
 451                         } else {
 452
 453                             /* Set end anchor */
 454                             pc->ea = anchor;
 455                             NR::Point p;
 456                             if (anchor) {
 457
 458                                 p = anchor->dp;
 459                                 // we hit an anchor, will finish the curve (either with or without closing)
 460                                 // in release handler
 461                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 462
 463                                 if (pc->green_anchor && pc->green_anchor->active) {
 464                                     // we clicked on the current curve start, so close it even if
 465                                     // we drag a handle away from it
 466                                     dc->green_closed = TRUE;
 467                                 }
 468                                 ret = TRUE;
 469                                 break;
 470
 471                             } else {
 472
 473                                 p = event_dt;
 474                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 475                                 spdc_pen_set_subsequent_point(pc, p, true);
 476                             }
 477
 478                         }
 479                         pc->state = SP_PEN_CONTEXT_CONTROL;
 480                         ret = TRUE;
 481                         break;
 482                     case SP_PEN_CONTEXT_CONTROL:
 483                         g_warning("Button down in CONTROL state");
 484                         break;
 485                     case SP_PEN_CONTEXT_CLOSE:
 486                         g_warning("Button down in CLOSE state");
 487                         break;
 488                     default:
 489                         break;
 490                 }
 491                 break;
 492             default:
 493                 break;
 494         }
 495     } else if (bevent.button == 3) {
 496         if (pc->npoints != 0) {
 497
 498             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 499             if (pc->green_closed) {
 500                 // finishing at the start anchor, close curve
 501                 spdc_pen_finish(pc, TRUE);
 502             } else {
 503                 // finishing at some other anchor, finish curve but not close
 504                 spdc_pen_finish(pc, FALSE);
 505             }
 506
 507             ret = TRUE;
 508         }
 509     }
 510
 511     return ret;
 512 }
 513
 514 /**
 515  * Handle motion_notify event.
 516  */
 517 static gint
 518 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 519 {
 520     gint ret = FALSE;
 521
 522     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 523
 524     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 525         // allow scrolling
 526         return FALSE;
 527     }
 528
 529     if (pc->events_disabled) {
 530         // skip motion events if pen events are disabled
 531         return FALSE;
 532     }
 533
 534     NR::Point const event_w(mevent.x,
 535                             mevent.y);
 536     if (pen_within_tolerance) {
 537         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 538                                                                "value", 0, 0, 100);
 539         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 540             return FALSE;   // Do not drag if we're within tolerance from origin.
 541         }
 542     }
 543     // Once the user has moved farther than tolerance from the original location
 544     // (indicating they intend to move the object, not click), then always process the
 545     // motion notify coordinates as given (no snapping back to origin)
 546     pen_within_tolerance = false;
 547
 548     SPDesktop *const dt = pc->desktop;
 549     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 550         /* Grab mouse, so release will not pass unnoticed */
 551         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 552         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 553                                         GDK_BUTTON_RELEASE_MASK |
 554                                         GDK_POINTER_MOTION_MASK  ),
 555                             NULL, mevent.time);
 556     }
 557
 558     /* Find desktop coordinates */
 559     NR::Point p = dt->w2d(event_w);
 560
 561     /* Test, whether we hit any anchor */
 562     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 563
 564     switch (pc->mode) {
 565         case SP_PEN_CONTEXT_MODE_CLICK:
 566             switch (pc->state) {
 567                 case SP_PEN_CONTEXT_POINT:
 568                     if ( pc->npoints != 0 ) {
 569                         /* Only set point, if we are already appending */
 570                         spdc_endpoint_snap(pc, p, mevent.state);
 571                         spdc_pen_set_subsequent_point(pc, p, true);
 572                         ret = TRUE;
 573                     }
 574                     break;
 575                 case SP_PEN_CONTEXT_CONTROL:
 576                 case SP_PEN_CONTEXT_CLOSE:
 577                     /* Placing controls is last operation in CLOSE state */
 578                     spdc_endpoint_snap(pc, p, mevent.state);
 579                     spdc_pen_set_ctrl(pc, p, mevent.state);
 580                     ret = TRUE;
 581                     break;
 582                 case SP_PEN_CONTEXT_STOP:
 583                     /* This is perfectly valid */
 584                     break;
 585                 default:
 586                     break;
 587             }
 588             break;
 589         case SP_PEN_CONTEXT_MODE_DRAG:
 590             switch (pc->state) {
 591                 case SP_PEN_CONTEXT_POINT:
 592                     if ( pc->npoints > 0 ) {
 593                         /* Only set point, if we are already appending */
 594
 595                         if (!anchor) {   /* Snap node only if not hitting anchor */
 596                             spdc_endpoint_snap(pc, p, mevent.state);
 597                         }
 598
 599                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 600
 601                         if (anchor && !pc->anchor_statusbar) {
 602                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 603                             pc->anchor_statusbar = true;
 604                         } else if (!anchor && pc->anchor_statusbar) {
 605                             pc->_message_context->clear();
 606                             pc->anchor_statusbar = false;
 607                         }
 608
 609                         ret = TRUE;
 610                     } else {
 611                         if (anchor && !pc->anchor_statusbar) {
 612                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 613                             pc->anchor_statusbar = true;
 614                         } else if (!anchor && pc->anchor_statusbar) {
 615                             pc->_message_context->clear();
 616                             pc->anchor_statusbar = false;
 617                         }
 618                     }
 619                     break;
 620                 case SP_PEN_CONTEXT_CONTROL:
 621                 case SP_PEN_CONTEXT_CLOSE:
 622                     /* Placing controls is last operation in CLOSE state */
 623
 624                     // snap the handle
 625                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 626
 627                     spdc_pen_set_ctrl(pc, p, mevent.state);
 628                     gobble_motion_events(GDK_BUTTON1_MASK);
 629                     ret = TRUE;
 630                     break;
 631                 case SP_PEN_CONTEXT_STOP:
 632                     /* This is perfectly valid */
 633                     break;
 634                 default:
 635                     break;
 636             }
 637             break;
 638         default:
 639             break;
 640     }
 641     return ret;
 642 }
 643
 644 /**
 645  * Handle mouse button release event.
 646  */
 647 static gint
 648 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 649 {
 650     if (pc->events_disabled) {
 651         // skip event processing if events are disabled
 652         return FALSE;
 653     }
 654
 655     gint ret = FALSE;
 656     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 657     if ( revent.button == 1  && !event_context->space_panning) {
 658
 659         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 660
 661         NR::Point const event_w(revent.x,
 662                                 revent.y);
 663         /* Find desktop coordinates */
 664         NR::Point p = pc->desktop->w2d(event_w);
 665
 666         /* Test whether we hit any anchor. */
 667         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 668
 669         switch (pc->mode) {
 670             case SP_PEN_CONTEXT_MODE_CLICK:
 671                 switch (pc->state) {
 672                     case SP_PEN_CONTEXT_POINT:
 673                         if ( pc->npoints == 0 ) {
 674                             /* Start new thread only with button release */
 675                             if (anchor) {
 676                                 p = anchor->dp;
 677                             }
 678                             pc->sa = anchor;
 679                             spdc_pen_set_initial_point(pc, p);
 680                         } else {
 681                             /* Set end anchor here */
 682                             pc->ea = anchor;
 683                             if (anchor) {
 684                                 p = anchor->dp;
 685                             }
 686                         }
 687                         pc->state = SP_PEN_CONTEXT_CONTROL;
 688                         ret = TRUE;
 689                         break;
 690                     case SP_PEN_CONTEXT_CONTROL:
 691                         /* End current segment */
 692                         spdc_endpoint_snap(pc, p, revent.state);
 693                         spdc_pen_finish_segment(pc, p, revent.state);
 694                         pc->state = SP_PEN_CONTEXT_POINT;
 695                         ret = TRUE;
 696                         break;
 697                     case SP_PEN_CONTEXT_CLOSE:
 698                         /* End current segment */
 699                         if (!anchor) {   /* Snap node only if not hitting anchor */
 700                             spdc_endpoint_snap(pc, p, revent.state);
 701                         }
 702                         spdc_pen_finish_segment(pc, p, revent.state);
 703                         spdc_pen_finish(pc, TRUE);
 704                         pc->state = SP_PEN_CONTEXT_POINT;
 705                         ret = TRUE;
 706                         break;
 707                     case SP_PEN_CONTEXT_STOP:
 708                         /* This is allowed, if we just cancelled curve */
 709                         pc->state = SP_PEN_CONTEXT_POINT;
 710                         ret = TRUE;
 711                         break;
 712                     default:
 713                         break;
 714                 }
 715                 break;
 716             case SP_PEN_CONTEXT_MODE_DRAG:
 717                 switch (pc->state) {
 718                     case SP_PEN_CONTEXT_POINT:
 719                     case SP_PEN_CONTEXT_CONTROL:
 720                         spdc_endpoint_snap(pc, p, revent.state);
 721                         spdc_pen_finish_segment(pc, p, revent.state);
 722                         break;
 723                     case SP_PEN_CONTEXT_CLOSE:
 724                         spdc_endpoint_snap(pc, p, revent.state);
 725                         spdc_pen_finish_segment(pc, p, revent.state);
 726                         if (pc->green_closed) {
 727                             // finishing at the start anchor, close curve
 728                             spdc_pen_finish(pc, TRUE);
 729                         } else {
 730                             // finishing at some other anchor, finish curve but not close
 731                             spdc_pen_finish(pc, FALSE);
 732                         }
 733                         break;
 734                     case SP_PEN_CONTEXT_STOP:
 735                         /* This is allowed, if we just cancelled curve */
 736                         break;
 737                     default:
 738                         break;
 739                 }
 740                 pc->state = SP_PEN_CONTEXT_POINT;
 741                 ret = TRUE;
 742                 break;
 743             default:
 744                 break;
 745         }
 746
 747         if (pc->grab) {
 748             /* Release grab now */
 749             sp_canvas_item_ungrab(pc->grab, revent.time);
 750             pc->grab = NULL;
 751         }
 752
 753         ret = TRUE;
 754
 755         dc->green_closed = FALSE;
 756     }
 757
 758     return ret;
 759 }
 760
 761 static gint
 762 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 763 {
 764     gint ret = FALSE;
 765     if (pc->npoints != 0 && bevent.button != 2) {
 766         spdc_pen_finish(pc, FALSE);
 767         ret = TRUE;
 768     }
 769     return ret;
 770 }
 771
 772 void
 773 pen_redraw_all (SPPenContext *const pc)
 774 {
 775     // green
 776     if (pc->green_bpaths) {
 777         // remove old piecewise green canvasitems
 778         while (pc->green_bpaths) {
 779             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 780             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 781         }
 782         // one canvas bpath for all of green_curve
 783         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 784         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 785         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 786
 787         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 788     }
 789
 790     if (pc->green_anchor)
 791         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 792
 793     pc->red_curve->reset();
 794     pc->red_curve->moveto(pc->p[0]);
 795     pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
 796     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 797
 798     // handles
 799     if (pc->p[0] != pc->p[1]) {
 800         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 801         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 802         sp_canvas_item_show (pc->c1);
 803         sp_canvas_item_show (pc->cl1);
 804     } else {
 805         sp_canvas_item_hide (pc->c1);
 806         sp_canvas_item_hide (pc->cl1);
 807     }
 808
 809     NArtBpath *const bpath = pc->green_curve->last_bpath();
 810     if (bpath) {
 811         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 812             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 813             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 814             sp_canvas_item_show (pc->c0);
 815             sp_canvas_item_show (pc->cl0);
 816         } else {
 817             sp_canvas_item_hide (pc->c0);
 818             sp_canvas_item_hide (pc->cl0);
 819         }
 820     }
 821 }
 822
 823 void
 824 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 825 {
 826     if (pc->npoints != 5)
 827         return;
 828
 829     // green
 830     NArtBpath *const bpath = pc->green_curve->last_bpath();
 831     if (bpath) {
 832         if (bpath->code == NR_CURVETO) {
 833             bpath->x2 += x;
 834             bpath->y2 += y;
 835         }
 836         bpath->x3 += x;
 837         bpath->y3 += y;
 838     } else {
 839         // start anchor too
 840         if (pc->green_anchor) {
 841             pc->green_anchor->dp += NR::Point(x, y);
 842         }
 843     }
 844
 845     // red
 846     pc->p[0] += NR::Point(x, y);
 847     pc->p[1] += NR::Point(x, y);
 848     pen_redraw_all(pc);
 849 }
 850
 851 void
 852 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 853 {
 854     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 855 }
 856
 857 void
 858 pen_lastpoint_tocurve (SPPenContext *const pc)
 859 {
 860     if (pc->npoints != 5)
 861         return;
 862
 863     // red
 864     NArtBpath *const bpath = pc->green_curve->last_bpath();
 865     if (bpath && bpath->code == NR_CURVETO) {
 866         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 867     } else {
 868         pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
 869     }
 870
 871     pen_redraw_all(pc);
 872 }
 873
 874 void
 875 pen_lastpoint_toline (SPPenContext *const pc)
 876 {
 877     if (pc->npoints != 5)
 878         return;
 879
 880     pc->p[1] = pc->p[0];
 881
 882     pen_redraw_all(pc);
 883 }
 884
 885
 886 static gint
 887 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 888 {
 889     gint ret = FALSE;
 890     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 891
 892     switch (get_group0_keyval (&event->key)) {
 893
 894         case GDK_Left: // move last point left
 895         case GDK_KP_Left:
 896         case GDK_KP_4:
 897             if (!MOD__CTRL) { // not ctrl
 898                 if (MOD__ALT) { // alt
 899                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 900                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 901                 }
 902                 else { // no alt
 903                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 904                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 905                 }
 906                 ret = TRUE;
 907             }
 908             break;
 909         case GDK_Up: // move last point up
 910         case GDK_KP_Up:
 911         case GDK_KP_8:
 912             if (!MOD__CTRL) { // not ctrl
 913                 if (MOD__ALT) { // alt
 914                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 915                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 916                 }
 917                 else { // no alt
 918                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 919                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 920                 }
 921                 ret = TRUE;
 922             }
 923             break;
 924         case GDK_Right: // move last point right
 925         case GDK_KP_Right:
 926         case GDK_KP_6:
 927             if (!MOD__CTRL) { // not ctrl
 928                 if (MOD__ALT) { // alt
 929                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 930                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 931                 }
 932                 else { // no alt
 933                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 934                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 935                 }
 936                 ret = TRUE;
 937             }
 938             break;
 939         case GDK_Down: // move last point down
 940         case GDK_KP_Down:
 941         case GDK_KP_2:
 942             if (!MOD__CTRL) { // not ctrl
 943                 if (MOD__ALT) { // alt
 944                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 945                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 946                 }
 947                 else { // no alt
 948                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 949                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 950                 }
 951                 ret = TRUE;
 952             }
 953             break;
 954
 955         case GDK_U:
 956         case GDK_u:
 957             if (MOD__SHIFT_ONLY) {
 958                 pen_lastpoint_tocurve(pc);
 959                 ret = TRUE;
 960             }
 961             break;
 962         case GDK_L:
 963         case GDK_l:
 964             if (MOD__SHIFT_ONLY) {
 965                 pen_lastpoint_toline(pc);
 966                 ret = TRUE;
 967             }
 968             break;
 969
 970         case GDK_Return:
 971         case GDK_KP_Enter:
 972             if (pc->npoints != 0) {
 973                 spdc_pen_finish(pc, FALSE);
 974                 ret = TRUE;
 975             }
 976             break;
 977         case GDK_Escape:
 978             if (pc->npoints != 0) {
 979                 // if drawing, cancel, otherwise pass it up for deselecting
 980                 pen_cancel (pc);
 981                 ret = TRUE;
 982             }
 983             break;
 984         case GDK_z:
 985         case GDK_Z:
 986             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 987                 // if drawing, cancel, otherwise pass it up for undo
 988                 pen_cancel (pc);
 989                 ret = TRUE;
 990             }
 991             break;
 992         case GDK_g:
 993         case GDK_G:
 994             if (MOD__SHIFT_ONLY) {
 995                 sp_selection_to_guides();
 996                 ret = true;
 997             }
 998             break;
 999         case GDK_BackSpace:
1000         case GDK_Delete:
1001         case GDK_KP_Delete:
1002             if (pc->green_curve->is_empty()) {
1003                 if (!pc->red_curve->is_empty()) {
1004                     pen_cancel (pc);
1005                     ret = TRUE;
1006                 } else {
1007                     // do nothing; this event should be handled upstream
1008                 }
1009             } else {
1010                 /* Reset red curve */
1011                 pc->red_curve->reset();
1012                 /* Destroy topmost green bpath */
1013                 if (pc->green_bpaths) {
1014                     if (pc->green_bpaths->data)
1015                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1016                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1017                 }
1018                 /* Get last segment */
1019                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1020                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1021                 if ( e < 2 ) {
1022                     g_warning("Green curve length is %d", e);
1023                     break;
1024                 }
1025                 pc->p[0] = p[e - 2].c(3);
1026                 if (p[e - 1].code == NR_CURVETO) {
1027                     pc->p[1] = p[e - 1].c(1);
1028                 } else {
1029                     pc->p[1] = pc->p[0];
1030                 }
1031                 NR::Point const pt(( pc->npoints < 4
1032                                      ? p[e - 1].c(3)
1033                                      : pc->p[3] ));
1034                 pc->npoints = 2;
1035                 pc->green_curve->backspace();
1036                 sp_canvas_item_hide(pc->c0);
1037                 sp_canvas_item_hide(pc->c1);
1038                 sp_canvas_item_hide(pc->cl0);
1039                 sp_canvas_item_hide(pc->cl1);
1040                 pc->state = SP_PEN_CONTEXT_POINT;
1041                 spdc_pen_set_subsequent_point(pc, pt, true);
1042                 ret = TRUE;
1043             }
1044             break;
1045         default:
1046             break;
1047     }
1048     return ret;
1049 }
1050
1051 static void
1052 spdc_reset_colors(SPPenContext *pc)
1053 {
1054     /* Red */
1055     pc->red_curve->reset();
1056     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1057     /* Blue */
1058     pc->blue_curve->reset();
1059     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1060     /* Green */
1061     while (pc->green_bpaths) {
1062         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1063         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1064     }
1065     pc->green_curve->reset();
1066     if (pc->green_anchor) {
1067         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1068     }
1069     pc->sa = NULL;
1070     pc->ea = NULL;
1071     pc->npoints = 0;
1072     pc->red_curve_is_valid = false;
1073 }
1074
1075
1076 static void
1077 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1078 {
1079     g_assert( pc->npoints == 0 );
1080
1081     pc->p[0] = p;
1082     pc->p[1] = p;
1083     pc->npoints = 2;
1084     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1085
1086     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1087 }
1088
1089 /**
1090  * Show the status message for the current line/curve segment.
1091  * This type of message always shows angle/distance as the last
1092  * two parameters ("angle %3.2f&#176;, distance %s").
1093  */
1094 static void
1095 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1096 {
1097     g_assert(pc != NULL);
1098     g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1099     g_assert(message != NULL);
1100
1101     SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1102     NR::Point rel = p - pc->p[pc_point_to_compare];
1103     GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1104     double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1105     if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1106         angle = angle_to_compass (angle);
1107
1108     pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1109     g_string_free(dist, FALSE);
1110 }
1111
1112 static void
1113 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1114 {
1115     g_assert( pc->npoints != 0 );
1116     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1117
1118     pc->p[2] = p;
1119     pc->p[3] = p;
1120     pc->p[4] = p;
1121     pc->npoints = 5;
1122     pc->red_curve->reset();
1123     pc->red_curve->moveto(pc->p[0]);
1124     bool is_curve;
1125     if ( (pc->onlycurves)
1126          || ( pc->p[1] != pc->p[0] ) )
1127     {
1128         pc->red_curve->curveto(pc->p[1], p, p);
1129         is_curve = true;
1130     } else {
1131         pc->red_curve->lineto(p);
1132         is_curve = false;
1133     }
1134
1135     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1136
1137     if (statusbar) {
1138         gchar *message = is_curve ?
1139             _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1140             _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1141         spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1142         g_free(message);
1143     }
1144 }
1145
1146 static void
1147 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1148 {
1149     sp_canvas_item_show(pc->c1);
1150     sp_canvas_item_show(pc->cl1);
1151
1152     if ( pc->npoints == 2 ) {
1153         pc->p[1] = p;
1154         sp_canvas_item_hide(pc->c0);
1155         sp_canvas_item_hide(pc->cl0);
1156         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1157         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1158
1159         spdc_pen_set_angle_distance_status_message(pc, p, 0, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"));
1160     } else if ( pc->npoints == 5 ) {
1161         pc->p[4] = p;
1162         sp_canvas_item_show(pc->c0);
1163         sp_canvas_item_show(pc->cl0);
1164         bool is_symm = false;
1165         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1166              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1167             NR::Point delta = p - pc->p[3];
1168             pc->p[2] = pc->p[3] - delta;
1169             is_symm = true;
1170             pc->red_curve->reset();
1171             pc->red_curve->moveto(pc->p[0]);
1172             pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1173             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1174         }
1175         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1176         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1177         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1178         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1179
1180         gchar *message = is_symm ?
1181             _("<b>Curve handle, symmetric</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only") :
1182             _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only");
1183         spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1184         g_free(message);
1185     } else {
1186         g_warning("Something bad happened - npoints is %d", pc->npoints);
1187     }
1188 }
1189
1190 static void
1191 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1192 {
1193     if (!pc->red_curve->is_empty()) {
1194         pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1195         SPCurve *curve = pc->red_curve->copy();
1196         /// \todo fixme:
1197         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1198         curve->unref();
1199         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1200
1201         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1202
1203         pc->p[0] = pc->p[3];
1204         pc->p[1] = pc->p[4];
1205         pc->npoints = 2;
1206
1207         pc->red_curve->reset();
1208     }
1209 }
1210
1211 static void
1212 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1213 {
1214     pen_disable_events(pc);
1215
1216     SPDesktop *const desktop = pc->desktop;
1217     pc->_message_context->clear();
1218     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1219
1220     pc->red_curve->reset();
1221     spdc_concat_colors_and_flush(pc, closed);
1222     pc->sa = NULL;
1223     pc->ea = NULL;
1224
1225     pc->npoints = 0;
1226     pc->state = SP_PEN_CONTEXT_POINT;
1227
1228     sp_canvas_item_hide(pc->c0);
1229     sp_canvas_item_hide(pc->c1);
1230     sp_canvas_item_hide(pc->cl0);
1231     sp_canvas_item_hide(pc->cl1);
1232
1233     if (pc->green_anchor) {
1234         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1235     }
1236
1237
1238     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1239
1240     pen_enable_events(pc);
1241 }
1242
1243 static void
1244 pen_disable_events(SPPenContext *const pc) {
1245   pc->events_disabled++;
1246 }
1247
1248 static void
1249 pen_enable_events(SPPenContext *const pc) {
1250   g_return_if_fail(pc->events_disabled != 0);
1251
1252   pc->events_disabled--;
1253 }
1254
1255 /*
1256   Local Variables:
1257   mode:c++
1258   c-file-style:"stroustrup"
1259   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1260   indent-tabs-mode:nil
1261   fill-column:99
1262   End:
1263 */
1264 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :