src/pen-context.cpp

   1 /** \file
   2  * Pen event context implementation.
   3  */
   4
   5 /*
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2000 Lauris Kaplinski
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  * Copyright (C) 2002 Lauris Kaplinski
  13  * Copyright (C) 2004 Monash University
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #include <gdk/gdkkeysyms.h>
  19
  20 #include "pen-context.h"
  21 #include "sp-namedview.h"
  22 #include "sp-metrics.h"
  23 #include "desktop.h"
  24 #include "desktop-handles.h"
  25 #include "selection.h"
  26 #include "selection-chemistry.h"
  27 #include "draw-anchor.h"
  28 #include "message-stack.h"
  29 #include "message-context.h"
  30 #include "prefs-utils.h"
  31 #include "sp-path.h"
  32
  33 #include "pixmaps/cursor-pen.xpm"
  34 #include "display/canvas-bpath.h"
  35 #include "display/sp-ctrlline.h"
  36 #include "display/sodipodi-ctrl.h"
  37 #include <glibmm/i18n.h>
  38 #include "libnr/n-art-bpath.h"
  39 #include "helper/units.h"
  40 #include "macros.h"
  41 #include "context-fns.h"
  42
  43
  44 static void sp_pen_context_class_init(SPPenContextClass *klass);
  45 static void sp_pen_context_init(SPPenContext *pc);
  46 static void sp_pen_context_dispose(GObject *object);
  47
  48 static void sp_pen_context_setup(SPEventContext *ec);
  49 static void sp_pen_context_finish(SPEventContext *ec);
  50 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  51 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  52 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  53
  54 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  55 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  56 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  57 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  58
  59 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  60
  61 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  62 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  63 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  64 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  65 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  66 static void spdc_reset_colors(SPPenContext *pc);
  67
  68 static void pen_disable_events(SPPenContext *const pc);
  69 static void pen_enable_events(SPPenContext *const pc);
  70
  71 static NR::Point pen_drag_origin_w(0, 0);
  72 static bool pen_within_tolerance = false;
  73
  74 static SPDrawContextClass *pen_parent_class;
  75
  76 /**
  77  * Register SPPenContext with Gdk and return its type.
  78  */
  79 GType
  80 sp_pen_context_get_type(void)
  81 {
  82     static GType type = 0;
  83     if (!type) {
  84         GTypeInfo info = {
  85             sizeof(SPPenContextClass),
  86             NULL, NULL,
  87             (GClassInitFunc) sp_pen_context_class_init,
  88             NULL, NULL,
  89             sizeof(SPPenContext),
  90             4,
  91             (GInstanceInitFunc) sp_pen_context_init,
  92             NULL,   /* value_table */
  93         };
  94         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  95     }
  96     return type;
  97 }
  98
  99 /**
 100  * Initialize the SPPenContext vtable.
 101  */
 102 static void
 103 sp_pen_context_class_init(SPPenContextClass *klass)
 104 {
 105     GObjectClass *object_class;
 106     SPEventContextClass *event_context_class;
 107
 108     object_class = (GObjectClass *) klass;
 109     event_context_class = (SPEventContextClass *) klass;
 110
 111     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 112
 113     object_class->dispose = sp_pen_context_dispose;
 114
 115     event_context_class->setup = sp_pen_context_setup;
 116     event_context_class->finish = sp_pen_context_finish;
 117     event_context_class->set = sp_pen_context_set;
 118     event_context_class->root_handler = sp_pen_context_root_handler;
 119     event_context_class->item_handler = sp_pen_context_item_handler;
 120 }
 121
 122 /**
 123  * Callback to initialize SPPenContext object.
 124  */
 125 static void
 126 sp_pen_context_init(SPPenContext *pc)
 127 {
 128
 129     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 130
 131     event_context->cursor_shape = cursor_pen_xpm;
 132     event_context->hot_x = 4;
 133     event_context->hot_y = 4;
 134
 135     pc->npoints = 0;
 136     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 137     pc->state = SP_PEN_CONTEXT_POINT;
 138
 139     pc->c0 = NULL;
 140     pc->c1 = NULL;
 141     pc->cl0 = NULL;
 142     pc->cl1 = NULL;
 143
 144     pc->events_disabled = 0;
 145 }
 146
 147 /**
 148  * Callback to destroy the SPPenContext object's members and itself.
 149  */
 150 static void
 151 sp_pen_context_dispose(GObject *object)
 152 {
 153     SPPenContext *pc;
 154
 155     pc = SP_PEN_CONTEXT(object);
 156
 157     if (pc->c0) {
 158         gtk_object_destroy(GTK_OBJECT(pc->c0));
 159         pc->c0 = NULL;
 160     }
 161     if (pc->c1) {
 162         gtk_object_destroy(GTK_OBJECT(pc->c1));
 163         pc->c1 = NULL;
 164     }
 165     if (pc->cl0) {
 166         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 167         pc->cl0 = NULL;
 168     }
 169     if (pc->cl1) {
 170         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 171         pc->cl1 = NULL;
 172     }
 173
 174     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 175 }
 176
 177 /**
 178  * Callback to initialize SPPenContext object.
 179  */
 180 static void
 181 sp_pen_context_setup(SPEventContext *ec)
 182 {
 183     SPPenContext *pc;
 184
 185     pc = SP_PEN_CONTEXT(ec);
 186
 187     if (((SPEventContextClass *) pen_parent_class)->setup) {
 188         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 189     }
 190
 191     /* Pen indicators */
 192     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 193                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 194     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 195                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 196     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 197     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 198     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 199     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 200
 201     sp_canvas_item_hide(pc->c0);
 202     sp_canvas_item_hide(pc->c1);
 203     sp_canvas_item_hide(pc->cl0);
 204     sp_canvas_item_hide(pc->cl1);
 205
 206     sp_event_context_read(ec, "mode");
 207
 208     pc->anchor_statusbar = false;
 209
 210     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 211         ec->enableSelectionCue();
 212     }
 213 }
 214
 215 static void
 216 pen_cancel (SPPenContext *const pc)
 217 {
 218     pc->state = SP_PEN_CONTEXT_STOP;
 219     spdc_reset_colors(pc);
 220     sp_canvas_item_hide(pc->c0);
 221     sp_canvas_item_hide(pc->c1);
 222     sp_canvas_item_hide(pc->cl0);
 223     sp_canvas_item_hide(pc->cl1);
 224     pc->_message_context->clear();
 225     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 226
 227     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 228 }
 229
 230 /**
 231  * Finalization callback.
 232  */
 233 static void
 234 sp_pen_context_finish(SPEventContext *ec)
 235 {
 236     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 237
 238     if (pc->npoints != 0) {
 239         pen_cancel (pc);
 240     }
 241
 242     if (((SPEventContextClass *) pen_parent_class)->finish) {
 243         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 244     }
 245 }
 246
 247 /**
 248  * Callback that sets key to value in pen context.
 249  */
 250 static void
 251 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 252 {
 253     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 254
 255     if (!strcmp(key, "mode")) {
 256         if ( val && !strcmp(val, "drag") ) {
 257             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 258         } else {
 259             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 260         }
 261     }
 262 }
 263
 264 /**
 265  * Snaps new node relative to the previous node.
 266  */
 267 static void
 268 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 269 {
 270     if (pc->npoints > 0) {
 271         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 272     }
 273
 274     spdc_endpoint_snap_free(pc, p, state);
 275 }
 276
 277 /**
 278  * Snaps new node's handle relative to the new node.
 279  */
 280 static void
 281 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 282 {
 283     g_return_if_fail(( pc->npoints == 2 ||
 284                        pc->npoints == 5   ));
 285
 286     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 287     spdc_endpoint_snap_free(pc, p, state);
 288 }
 289
 290 static gint
 291 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 292 {
 293     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 294
 295     gint ret = FALSE;
 296
 297     switch (event->type) {
 298         case GDK_BUTTON_PRESS:
 299             ret = pen_handle_button_press(pc, event->button);
 300             break;
 301         default:
 302             break;
 303     }
 304
 305     if (!ret) {
 306         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 307             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 308     }
 309
 310     return ret;
 311 }
 312
 313 /**
 314  * Callback to handle all pen events.
 315  */
 316 static gint
 317 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 318 {
 319     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 320
 321     gint ret = FALSE;
 322
 323     switch (event->type) {
 324         case GDK_BUTTON_PRESS:
 325             ret = pen_handle_button_press(pc, event->button);
 326             break;
 327
 328         case GDK_MOTION_NOTIFY:
 329             ret = pen_handle_motion_notify(pc, event->motion);
 330             break;
 331
 332         case GDK_BUTTON_RELEASE:
 333             ret = pen_handle_button_release(pc, event->button);
 334             break;
 335
 336         case GDK_2BUTTON_PRESS:
 337             ret = pen_handle_2button_press(pc, event->button);
 338             break;
 339
 340         case GDK_KEY_PRESS:
 341             ret = pen_handle_key_press(pc, event);
 342             break;
 343
 344         default:
 345             break;
 346     }
 347
 348     if (!ret) {
 349         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 350             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 351         if (parent_root_handler) {
 352             ret = parent_root_handler(ec, event);
 353         }
 354     }
 355
 356     return ret;
 357 }
 358
 359 /**
 360  * Handle mouse button press event.
 361  */
 362 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 363 {
 364     if (pc->events_disabled) {
 365         // skip event processing if events are disabled
 366         return FALSE;
 367     }
 368
 369     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 370     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 371     NR::Point const event_w(bevent.x, bevent.y);
 372     NR::Point const event_dt(desktop->w2d(event_w));
 373     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 374
 375     gint ret = FALSE;
 376     if (bevent.button == 1 && !event_context->space_panning) {
 377
 378         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 379             return TRUE;
 380         }
 381
 382         pen_drag_origin_w = event_w;
 383         pen_within_tolerance = true;
 384
 385         /* Test whether we hit any anchor. */
 386         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 387
 388         switch (pc->mode) {
 389             case SP_PEN_CONTEXT_MODE_CLICK:
 390                 /* In click mode we add point on release */
 391                 switch (pc->state) {
 392                     case SP_PEN_CONTEXT_POINT:
 393                     case SP_PEN_CONTEXT_CONTROL:
 394                     case SP_PEN_CONTEXT_CLOSE:
 395                         break;
 396                     case SP_PEN_CONTEXT_STOP:
 397                         /* This is allowed, if we just cancelled curve */
 398                         pc->state = SP_PEN_CONTEXT_POINT;
 399                         break;
 400                     default:
 401                         break;
 402                 }
 403                 break;
 404             case SP_PEN_CONTEXT_MODE_DRAG:
 405                 switch (pc->state) {
 406                     case SP_PEN_CONTEXT_STOP:
 407                         /* This is allowed, if we just cancelled curve */
 408                     case SP_PEN_CONTEXT_POINT:
 409                         if (pc->npoints == 0) {
 410
 411                             if (bevent.state & GDK_CONTROL_MASK) {
 412                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 413                                 ret = TRUE;
 414                                 break;
 415                             }
 416
 417                             /* Set start anchor */
 418                             pc->sa = anchor;
 419                             NR::Point p;
 420                             if (anchor) {
 421
 422                                 /* Adjust point to anchor if needed */
 423                                 p = anchor->dp;
 424                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 425
 426                             } else {
 427
 428                                 // This is the first click of a new curve; deselect item so that
 429                                 // this curve is not combined with it (unless it is drawn from its
 430                                 // anchor, which is handled by the sibling branch above)
 431                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 432                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 433
 434                                     selection->clear();
 435                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 436
 437                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 438
 439                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 440                                 }
 441
 442                                 /* Create green anchor */
 443                                 p = event_dt;
 444                                 spdc_endpoint_snap(pc, p, bevent.state);
 445                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 446                             }
 447                             spdc_pen_set_initial_point(pc, p);
 448                         } else {
 449
 450                             /* Set end anchor */
 451                             pc->ea = anchor;
 452                             NR::Point p;
 453                             if (anchor) {
 454
 455                                 p = anchor->dp;
 456                                 // we hit an anchor, will finish the curve (either with or without closing)
 457                                 // in release handler
 458                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 459
 460                                 if (pc->green_anchor && pc->green_anchor->active) {
 461                                     // we clicked on the current curve start, so close it even if
 462                                     // we drag a handle away from it
 463                                     dc->green_closed = TRUE;
 464                                 }
 465                                 ret = TRUE;
 466                                 break;
 467
 468                             } else {
 469
 470                                 p = event_dt;
 471                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 472                                 spdc_pen_set_subsequent_point(pc, p, true);
 473                             }
 474
 475                         }
 476                         pc->state = SP_PEN_CONTEXT_CONTROL;
 477                         ret = TRUE;
 478                         break;
 479                     case SP_PEN_CONTEXT_CONTROL:
 480                         g_warning("Button down in CONTROL state");
 481                         break;
 482                     case SP_PEN_CONTEXT_CLOSE:
 483                         g_warning("Button down in CLOSE state");
 484                         break;
 485                     default:
 486                         break;
 487                 }
 488                 break;
 489             default:
 490                 break;
 491         }
 492     } else if (bevent.button == 3) {
 493         if (pc->npoints != 0) {
 494
 495             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 496             if (pc->green_closed) {
 497                 // finishing at the start anchor, close curve
 498                 spdc_pen_finish(pc, TRUE);
 499             } else {
 500                 // finishing at some other anchor, finish curve but not close
 501                 spdc_pen_finish(pc, FALSE);
 502             }
 503
 504             ret = TRUE;
 505         }
 506     }
 507
 508     return ret;
 509 }
 510
 511 /**
 512  * Handle motion_notify event.
 513  */
 514 static gint
 515 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 516 {
 517     gint ret = FALSE;
 518
 519     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 520
 521     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 522         // allow scrolling
 523         return FALSE;
 524     }
 525
 526     if (pc->events_disabled) {
 527         // skip motion events if pen events are disabled
 528         return FALSE;
 529     }
 530
 531     NR::Point const event_w(mevent.x,
 532                             mevent.y);
 533     if (pen_within_tolerance) {
 534         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 535                                                                "value", 0, 0, 100);
 536         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 537             return FALSE;   // Do not drag if we're within tolerance from origin.
 538         }
 539     }
 540     // Once the user has moved farther than tolerance from the original location
 541     // (indicating they intend to move the object, not click), then always process the
 542     // motion notify coordinates as given (no snapping back to origin)
 543     pen_within_tolerance = false;
 544
 545     SPDesktop *const dt = pc->desktop;
 546     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 547         /* Grab mouse, so release will not pass unnoticed */
 548         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 549         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 550                                         GDK_BUTTON_RELEASE_MASK |
 551                                         GDK_POINTER_MOTION_MASK  ),
 552                             NULL, mevent.time);
 553     }
 554
 555     /* Find desktop coordinates */
 556     NR::Point p = dt->w2d(event_w);
 557
 558     /* Test, whether we hit any anchor */
 559     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 560
 561     switch (pc->mode) {
 562         case SP_PEN_CONTEXT_MODE_CLICK:
 563             switch (pc->state) {
 564                 case SP_PEN_CONTEXT_POINT:
 565                     if ( pc->npoints != 0 ) {
 566                         /* Only set point, if we are already appending */
 567                         spdc_endpoint_snap(pc, p, mevent.state);
 568                         spdc_pen_set_subsequent_point(pc, p, true);
 569                         ret = TRUE;
 570                     }
 571                     break;
 572                 case SP_PEN_CONTEXT_CONTROL:
 573                 case SP_PEN_CONTEXT_CLOSE:
 574                     /* Placing controls is last operation in CLOSE state */
 575                     spdc_endpoint_snap(pc, p, mevent.state);
 576                     spdc_pen_set_ctrl(pc, p, mevent.state);
 577                     ret = TRUE;
 578                     break;
 579                 case SP_PEN_CONTEXT_STOP:
 580                     /* This is perfectly valid */
 581                     break;
 582                 default:
 583                     break;
 584             }
 585             break;
 586         case SP_PEN_CONTEXT_MODE_DRAG:
 587             switch (pc->state) {
 588                 case SP_PEN_CONTEXT_POINT:
 589                     if ( pc->npoints > 0 ) {
 590                         /* Only set point, if we are already appending */
 591
 592                         if (!anchor) {   /* Snap node only if not hitting anchor */
 593                             spdc_endpoint_snap(pc, p, mevent.state);
 594                         }
 595
 596                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 597
 598                         if (anchor && !pc->anchor_statusbar) {
 599                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 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                         ret = TRUE;
 607                     } else {
 608                         if (anchor && !pc->anchor_statusbar) {
 609                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 610                             pc->anchor_statusbar = true;
 611                         } else if (!anchor && pc->anchor_statusbar) {
 612                             pc->_message_context->clear();
 613                             pc->anchor_statusbar = false;
 614                         }
 615                     }
 616                     break;
 617                 case SP_PEN_CONTEXT_CONTROL:
 618                 case SP_PEN_CONTEXT_CLOSE:
 619                     /* Placing controls is last operation in CLOSE state */
 620
 621                     // snap the handle
 622                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 623
 624                     spdc_pen_set_ctrl(pc, p, mevent.state);
 625                     gobble_motion_events(GDK_BUTTON1_MASK);
 626                     ret = TRUE;
 627                     break;
 628                 case SP_PEN_CONTEXT_STOP:
 629                     /* This is perfectly valid */
 630                     break;
 631                 default:
 632                     break;
 633             }
 634             break;
 635         default:
 636             break;
 637     }
 638     return ret;
 639 }
 640
 641 /**
 642  * Handle mouse button release event.
 643  */
 644 static gint
 645 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 646 {
 647     if (pc->events_disabled) {
 648         // skip event processing if events are disabled
 649         return FALSE;
 650     }
 651
 652     gint ret = FALSE;
 653     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 654     if ( revent.button == 1  && !event_context->space_panning) {
 655
 656         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 657
 658         NR::Point const event_w(revent.x,
 659                                 revent.y);
 660         /* Find desktop coordinates */
 661         NR::Point p = pc->desktop->w2d(event_w);
 662
 663         /* Test whether we hit any anchor. */
 664         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 665
 666         switch (pc->mode) {
 667             case SP_PEN_CONTEXT_MODE_CLICK:
 668                 switch (pc->state) {
 669                     case SP_PEN_CONTEXT_POINT:
 670                         if ( pc->npoints == 0 ) {
 671                             /* Start new thread only with button release */
 672                             if (anchor) {
 673                                 p = anchor->dp;
 674                             }
 675                             pc->sa = anchor;
 676                             spdc_pen_set_initial_point(pc, p);
 677                         } else {
 678                             /* Set end anchor here */
 679                             pc->ea = anchor;
 680                             if (anchor) {
 681                                 p = anchor->dp;
 682                             }
 683                         }
 684                         pc->state = SP_PEN_CONTEXT_CONTROL;
 685                         ret = TRUE;
 686                         break;
 687                     case SP_PEN_CONTEXT_CONTROL:
 688                         /* End current segment */
 689                         spdc_endpoint_snap(pc, p, revent.state);
 690                         spdc_pen_finish_segment(pc, p, revent.state);
 691                         pc->state = SP_PEN_CONTEXT_POINT;
 692                         ret = TRUE;
 693                         break;
 694                     case SP_PEN_CONTEXT_CLOSE:
 695                         /* End current segment */
 696                         if (!anchor) {   /* Snap node only if not hitting anchor */
 697                             spdc_endpoint_snap(pc, p, revent.state);
 698                         }
 699                         spdc_pen_finish_segment(pc, p, revent.state);
 700                         spdc_pen_finish(pc, TRUE);
 701                         pc->state = SP_PEN_CONTEXT_POINT;
 702                         ret = TRUE;
 703                         break;
 704                     case SP_PEN_CONTEXT_STOP:
 705                         /* This is allowed, if we just cancelled curve */
 706                         pc->state = SP_PEN_CONTEXT_POINT;
 707                         ret = TRUE;
 708                         break;
 709                     default:
 710                         break;
 711                 }
 712                 break;
 713             case SP_PEN_CONTEXT_MODE_DRAG:
 714                 switch (pc->state) {
 715                     case SP_PEN_CONTEXT_POINT:
 716                     case SP_PEN_CONTEXT_CONTROL:
 717                         spdc_endpoint_snap(pc, p, revent.state);
 718                         spdc_pen_finish_segment(pc, p, revent.state);
 719                         break;
 720                     case SP_PEN_CONTEXT_CLOSE:
 721                         spdc_endpoint_snap(pc, p, revent.state);
 722                         spdc_pen_finish_segment(pc, p, revent.state);
 723                         if (pc->green_closed) {
 724                             // finishing at the start anchor, close curve
 725                             spdc_pen_finish(pc, TRUE);
 726                         } else {
 727                             // finishing at some other anchor, finish curve but not close
 728                             spdc_pen_finish(pc, FALSE);
 729                         }
 730                         break;
 731                     case SP_PEN_CONTEXT_STOP:
 732                         /* This is allowed, if we just cancelled curve */
 733                         break;
 734                     default:
 735                         break;
 736                 }
 737                 pc->state = SP_PEN_CONTEXT_POINT;
 738                 ret = TRUE;
 739                 break;
 740             default:
 741                 break;
 742         }
 743
 744         if (pc->grab) {
 745             /* Release grab now */
 746             sp_canvas_item_ungrab(pc->grab, revent.time);
 747             pc->grab = NULL;
 748         }
 749
 750         ret = TRUE;
 751
 752         dc->green_closed = FALSE;
 753     }
 754
 755     return ret;
 756 }
 757
 758 static gint
 759 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 760 {
 761     gint ret = FALSE;
 762     if (pc->npoints != 0 && bevent.button != 2) {
 763         spdc_pen_finish(pc, FALSE);
 764         ret = TRUE;
 765     }
 766     return ret;
 767 }
 768
 769 void
 770 pen_redraw_all (SPPenContext *const pc)
 771 {
 772     // green
 773     if (pc->green_bpaths) {
 774         // remove old piecewise green canvasitems
 775         while (pc->green_bpaths) {
 776             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 777             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 778         }
 779         // one canvas bpath for all of green_curve
 780         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 781         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 782         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 783
 784         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 785     }
 786
 787     if (pc->green_anchor)
 788         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 789
 790     sp_curve_reset(pc->red_curve);
 791     sp_curve_moveto(pc->red_curve, pc->p[0]);
 792     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 793     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 794
 795     // handles
 796     if (pc->p[0] != pc->p[1]) {
 797         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 798         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 799         sp_canvas_item_show (pc->c1);
 800         sp_canvas_item_show (pc->cl1);
 801     } else {
 802         sp_canvas_item_hide (pc->c1);
 803         sp_canvas_item_hide (pc->cl1);
 804     }
 805
 806     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 807     if (bpath) {
 808         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 809             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 810             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 811             sp_canvas_item_show (pc->c0);
 812             sp_canvas_item_show (pc->cl0);
 813         } else {
 814             sp_canvas_item_hide (pc->c0);
 815             sp_canvas_item_hide (pc->cl0);
 816         }
 817     }
 818 }
 819
 820 void
 821 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 822 {
 823     if (pc->npoints != 5)
 824         return;
 825
 826     // green
 827     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 828     if (bpath) {
 829         if (bpath->code == NR_CURVETO) {
 830             bpath->x2 += x;
 831             bpath->y2 += y;
 832         }
 833         bpath->x3 += x;
 834         bpath->y3 += y;
 835     } else {
 836         // start anchor too
 837         if (pc->green_anchor) {
 838             pc->green_anchor->dp += NR::Point(x, y);
 839         }
 840     }
 841
 842     // red
 843     pc->p[0] += NR::Point(x, y);
 844     pc->p[1] += NR::Point(x, y);
 845     pen_redraw_all(pc);
 846 }
 847
 848 void
 849 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 850 {
 851     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 852 }
 853
 854 void
 855 pen_lastpoint_tocurve (SPPenContext *const pc)
 856 {
 857     if (pc->npoints != 5)
 858         return;
 859
 860     // red
 861     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 862     if (bpath && bpath->code == NR_CURVETO) {
 863         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 864     } else {
 865         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 866     }
 867
 868     pen_redraw_all(pc);
 869 }
 870
 871 void
 872 pen_lastpoint_toline (SPPenContext *const pc)
 873 {
 874     if (pc->npoints != 5)
 875         return;
 876
 877     pc->p[1] = pc->p[0];
 878
 879     pen_redraw_all(pc);
 880 }
 881
 882
 883 static gint
 884 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 885 {
 886     gint ret = FALSE;
 887     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 888
 889     switch (get_group0_keyval (&event->key)) {
 890
 891         case GDK_Left: // move last point left
 892         case GDK_KP_Left:
 893         case GDK_KP_4:
 894             if (!MOD__CTRL) { // not ctrl
 895                 if (MOD__ALT) { // alt
 896                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 897                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 898                 }
 899                 else { // no alt
 900                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 901                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 902                 }
 903                 ret = TRUE;
 904             }
 905             break;
 906         case GDK_Up: // move last point up
 907         case GDK_KP_Up:
 908         case GDK_KP_8:
 909             if (!MOD__CTRL) { // not ctrl
 910                 if (MOD__ALT) { // alt
 911                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 912                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 913                 }
 914                 else { // no alt
 915                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 916                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 917                 }
 918                 ret = TRUE;
 919             }
 920             break;
 921         case GDK_Right: // move last point right
 922         case GDK_KP_Right:
 923         case GDK_KP_6:
 924             if (!MOD__CTRL) { // not ctrl
 925                 if (MOD__ALT) { // alt
 926                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 927                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 928                 }
 929                 else { // no alt
 930                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 931                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 932                 }
 933                 ret = TRUE;
 934             }
 935             break;
 936         case GDK_Down: // move last point down
 937         case GDK_KP_Down:
 938         case GDK_KP_2:
 939             if (!MOD__CTRL) { // not ctrl
 940                 if (MOD__ALT) { // alt
 941                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 942                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 943                 }
 944                 else { // no alt
 945                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 946                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 947                 }
 948                 ret = TRUE;
 949             }
 950             break;
 951
 952         case GDK_U:
 953         case GDK_u:
 954             if (MOD__SHIFT_ONLY) {
 955                 pen_lastpoint_tocurve(pc);
 956                 ret = TRUE;
 957             }
 958             break;
 959         case GDK_L:
 960         case GDK_l:
 961             if (MOD__SHIFT_ONLY) {
 962                 pen_lastpoint_toline(pc);
 963                 ret = TRUE;
 964             }
 965             break;
 966
 967         case GDK_Return:
 968         case GDK_KP_Enter:
 969             if (pc->npoints != 0) {
 970                 spdc_pen_finish(pc, FALSE);
 971                 ret = TRUE;
 972             }
 973             break;
 974         case GDK_Escape:
 975             if (pc->npoints != 0) {
 976                 // if drawing, cancel, otherwise pass it up for deselecting
 977                 pen_cancel (pc);
 978                 ret = TRUE;
 979             }
 980             break;
 981         case GDK_z:
 982         case GDK_Z:
 983             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 984                 // if drawing, cancel, otherwise pass it up for undo
 985                 pen_cancel (pc);
 986                 ret = TRUE;
 987             }
 988             break;
 989         case GDK_g:
 990         case GDK_G:
 991             if (MOD__SHIFT_ONLY) {
 992                 sp_selection_to_guides();
 993                 ret = true;
 994             }
 995             break;
 996         case GDK_BackSpace:
 997         case GDK_Delete:
 998         case GDK_KP_Delete:
 999             if (sp_curve_is_empty(pc->green_curve)) {
1000                 pen_cancel (pc);
1001                 ret = TRUE;
1002             } else {
1003                 /* Reset red curve */
1004                 sp_curve_reset(pc->red_curve);
1005                 /* Destroy topmost green bpath */
1006                 if (pc->green_bpaths) {
1007                     if (pc->green_bpaths->data)
1008                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1009                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1010                 }
1011                 /* Get last segment */
1012                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1013                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1014                 if ( e < 2 ) {
1015                     g_warning("Green curve length is %d", e);
1016                     break;
1017                 }
1018                 pc->p[0] = p[e - 2].c(3);
1019                 if (p[e - 1].code == NR_CURVETO) {
1020                     pc->p[1] = p[e - 1].c(1);
1021                 } else {
1022                     pc->p[1] = pc->p[0];
1023                 }
1024                 NR::Point const pt(( pc->npoints < 4
1025                                      ? p[e - 1].c(3)
1026                                      : pc->p[3] ));
1027                 pc->npoints = 2;
1028                 sp_curve_backspace(pc->green_curve);
1029                 sp_canvas_item_hide(pc->c0);
1030                 sp_canvas_item_hide(pc->c1);
1031                 sp_canvas_item_hide(pc->cl0);
1032                 sp_canvas_item_hide(pc->cl1);
1033                 pc->state = SP_PEN_CONTEXT_POINT;
1034                 spdc_pen_set_subsequent_point(pc, pt, true);
1035                 ret = TRUE;
1036             }
1037             break;
1038         default:
1039             break;
1040     }
1041     return ret;
1042 }
1043
1044 static void
1045 spdc_reset_colors(SPPenContext *pc)
1046 {
1047     /* Red */
1048     sp_curve_reset(pc->red_curve);
1049     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1050     /* Blue */
1051     sp_curve_reset(pc->blue_curve);
1052     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1053     /* Green */
1054     while (pc->green_bpaths) {
1055         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1056         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1057     }
1058     sp_curve_reset(pc->green_curve);
1059     if (pc->green_anchor) {
1060         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1061     }
1062     pc->sa = NULL;
1063     pc->ea = NULL;
1064     pc->npoints = 0;
1065     pc->red_curve_is_valid = false;
1066 }
1067
1068
1069 static void
1070 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1071 {
1072     g_assert( pc->npoints == 0 );
1073
1074     pc->p[0] = p;
1075     pc->p[1] = p;
1076     pc->npoints = 2;
1077     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1078
1079     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1080 }
1081
1082 static void
1083 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1084 {
1085     g_assert( pc->npoints != 0 );
1086     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1087
1088     pc->p[2] = p;
1089     pc->p[3] = p;
1090     pc->p[4] = p;
1091     pc->npoints = 5;
1092     sp_curve_reset(pc->red_curve);
1093     sp_curve_moveto(pc->red_curve, pc->p[0]);
1094     bool is_curve;
1095     if ( (pc->onlycurves)
1096          || ( pc->p[1] != pc->p[0] ) )
1097     {
1098         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1099         is_curve = true;
1100     } else {
1101         sp_curve_lineto(pc->red_curve, p);
1102         is_curve = false;
1103     }
1104
1105     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1106
1107     if (statusbar) {
1108         // status text
1109         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1110         NR::Point rel = p - pc->p[0];
1111         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1112         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1113         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1114             angle = angle_to_compass (angle);
1115         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path"), is_curve? "Curve segment" : "Line segment", angle, dist->str);
1116         g_string_free(dist, FALSE);
1117     }
1118 }
1119
1120 static void
1121 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1122 {
1123     sp_canvas_item_show(pc->c1);
1124     sp_canvas_item_show(pc->cl1);
1125
1126     if ( pc->npoints == 2 ) {
1127         pc->p[1] = p;
1128         sp_canvas_item_hide(pc->c0);
1129         sp_canvas_item_hide(pc->cl0);
1130         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1131         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1132
1133         // status text
1134         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1135         NR::Point rel = p - pc->p[0];
1136         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1137         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1138         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1139             angle = angle_to_compass (angle);
1140         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1141         g_string_free(dist, FALSE);
1142
1143     } else if ( pc->npoints == 5 ) {
1144         pc->p[4] = p;
1145         sp_canvas_item_show(pc->c0);
1146         sp_canvas_item_show(pc->cl0);
1147         bool is_symm = false;
1148         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1149              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1150             NR::Point delta = p - pc->p[3];
1151             pc->p[2] = pc->p[3] - delta;
1152             is_symm = true;
1153             sp_curve_reset(pc->red_curve);
1154             sp_curve_moveto(pc->red_curve, pc->p[0]);
1155             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1156             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1157         }
1158         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1159         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1160         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1161         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1162
1163         // status text
1164         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1165         NR::Point rel = p - pc->p[3];
1166         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1167         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1168         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1169             angle = angle_to_compass (angle);
1170         pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only"), is_symm? "Curve handle, symmetric" : "Curve handle", angle, dist->str);
1171         g_string_free(dist, FALSE);
1172
1173     } else {
1174         g_warning("Something bad happened - npoints is %d", pc->npoints);
1175     }
1176 }
1177
1178 static void
1179 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1180 {
1181     if (!sp_curve_empty(pc->red_curve)) {
1182         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1183         SPCurve *curve = sp_curve_copy(pc->red_curve);
1184         /// \todo fixme:
1185         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1186         sp_curve_unref(curve);
1187         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1188
1189         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1190
1191         pc->p[0] = pc->p[3];
1192         pc->p[1] = pc->p[4];
1193         pc->npoints = 2;
1194
1195         sp_curve_reset(pc->red_curve);
1196     }
1197 }
1198
1199 static void
1200 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1201 {
1202     pen_disable_events(pc);
1203
1204     SPDesktop *const desktop = pc->desktop;
1205     pc->_message_context->clear();
1206     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1207
1208     sp_curve_reset(pc->red_curve);
1209     spdc_concat_colors_and_flush(pc, closed);
1210     pc->sa = NULL;
1211     pc->ea = NULL;
1212
1213     pc->npoints = 0;
1214     pc->state = SP_PEN_CONTEXT_POINT;
1215
1216     sp_canvas_item_hide(pc->c0);
1217     sp_canvas_item_hide(pc->c1);
1218     sp_canvas_item_hide(pc->cl0);
1219     sp_canvas_item_hide(pc->cl1);
1220
1221     if (pc->green_anchor) {
1222         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1223     }
1224
1225
1226     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1227
1228     pen_enable_events(pc);
1229 }
1230
1231 static void
1232 pen_disable_events(SPPenContext *const pc) {
1233   pc->events_disabled++;
1234 }
1235
1236 static void
1237 pen_enable_events(SPPenContext *const pc) {
1238   g_return_if_fail(pc->events_disabled != 0);
1239
1240   pc->events_disabled--;
1241 }
1242
1243 /*
1244   Local Variables:
1245   mode:c++
1246   c-file-style:"stroustrup"
1247   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1248   indent-tabs-mode:nil
1249   fill-column:99
1250   End:
1251 */
1252 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :