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 #include "live_effects/effect.h"
  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     pc->polylines_only = false;
 150 }
 151
 152 /**
 153  * Callback to destroy the SPPenContext object's members and itself.
 154  */
 155 static void
 156 sp_pen_context_dispose(GObject *object)
 157 {
 158     SPPenContext *pc;
 159
 160     pc = SP_PEN_CONTEXT(object);
 161
 162     if (pc->c0) {
 163         gtk_object_destroy(GTK_OBJECT(pc->c0));
 164         pc->c0 = NULL;
 165     }
 166     if (pc->c1) {
 167         gtk_object_destroy(GTK_OBJECT(pc->c1));
 168         pc->c1 = NULL;
 169     }
 170     if (pc->cl0) {
 171         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 172         pc->cl0 = NULL;
 173     }
 174     if (pc->cl1) {
 175         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 176         pc->cl1 = NULL;
 177     }
 178
 179     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 180
 181     pc->polylines_only = false;
 182     if (pc->expecting_clicks_for_LPE > 0) {
 183         // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
 184         sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
 185     }
 186 }
 187
 188 /**
 189  * Callback to initialize SPPenContext object.
 190  */
 191 static void
 192 sp_pen_context_setup(SPEventContext *ec)
 193 {
 194     SPPenContext *pc;
 195
 196     pc = SP_PEN_CONTEXT(ec);
 197
 198     if (((SPEventContextClass *) pen_parent_class)->setup) {
 199         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 200     }
 201
 202     /* Pen indicators */
 203     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 204                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 205     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 206                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 207     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 208     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 209     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 210     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 211
 212     sp_canvas_item_hide(pc->c0);
 213     sp_canvas_item_hide(pc->c1);
 214     sp_canvas_item_hide(pc->cl0);
 215     sp_canvas_item_hide(pc->cl1);
 216
 217     sp_event_context_read(ec, "mode");
 218
 219     pc->anchor_statusbar = false;
 220
 221     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 222         ec->enableSelectionCue();
 223     }
 224 }
 225
 226 static void
 227 pen_cancel (SPPenContext *const pc)
 228 {
 229     pc->state = SP_PEN_CONTEXT_STOP;
 230     spdc_reset_colors(pc);
 231     sp_canvas_item_hide(pc->c0);
 232     sp_canvas_item_hide(pc->c1);
 233     sp_canvas_item_hide(pc->cl0);
 234     sp_canvas_item_hide(pc->cl1);
 235     pc->_message_context->clear();
 236     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 237
 238     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 239 }
 240
 241 /**
 242  * Finalization callback.
 243  */
 244 static void
 245 sp_pen_context_finish(SPEventContext *ec)
 246 {
 247     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 248
 249     if (pc->npoints != 0) {
 250         pen_cancel (pc);
 251     }
 252
 253     if (((SPEventContextClass *) pen_parent_class)->finish) {
 254         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 255     }
 256 }
 257
 258 /**
 259  * Callback that sets key to value in pen context.
 260  */
 261 static void
 262 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 263 {
 264     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 265
 266     if (!strcmp(key, "mode")) {
 267         if ( val && !strcmp(val, "drag") ) {
 268             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 269         } else {
 270             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 271         }
 272     }
 273 }
 274
 275 /**
 276  * Snaps new node relative to the previous node.
 277  */
 278 static void
 279 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 280 {
 281     if (pc->npoints > 0) {
 282         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 283     }
 284
 285     spdc_endpoint_snap_free(pc, p, state);
 286 }
 287
 288 /**
 289  * Snaps new node's handle relative to the new node.
 290  */
 291 static void
 292 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 293 {
 294     g_return_if_fail(( pc->npoints == 2 ||
 295                        pc->npoints == 5   ));
 296
 297     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 298     spdc_endpoint_snap_free(pc, p, state);
 299 }
 300
 301 static gint
 302 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 303 {
 304     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 305
 306     gint ret = FALSE;
 307
 308     switch (event->type) {
 309         case GDK_BUTTON_PRESS:
 310             ret = pen_handle_button_press(pc, event->button);
 311             break;
 312         default:
 313             break;
 314     }
 315
 316     if (!ret) {
 317         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 318             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 319     }
 320
 321     return ret;
 322 }
 323
 324 /**
 325  * Callback to handle all pen events.
 326  */
 327 static gint
 328 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 329 {
 330     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 331
 332     gint ret = FALSE;
 333
 334     switch (event->type) {
 335         case GDK_BUTTON_PRESS:
 336             ret = pen_handle_button_press(pc, event->button);
 337             break;
 338
 339         case GDK_MOTION_NOTIFY:
 340             ret = pen_handle_motion_notify(pc, event->motion);
 341             break;
 342
 343         case GDK_BUTTON_RELEASE:
 344             ret = pen_handle_button_release(pc, event->button);
 345             break;
 346
 347         case GDK_2BUTTON_PRESS:
 348             ret = pen_handle_2button_press(pc, event->button);
 349             break;
 350
 351         case GDK_KEY_PRESS:
 352             ret = pen_handle_key_press(pc, event);
 353             break;
 354
 355         default:
 356             break;
 357     }
 358
 359     if (!ret) {
 360         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 361             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 362         if (parent_root_handler) {
 363             ret = parent_root_handler(ec, event);
 364         }
 365     }
 366
 367     return ret;
 368 }
 369
 370 /**
 371  * Handle mouse button press event.
 372  */
 373 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 374 {
 375     if (pc->events_disabled) {
 376         // skip event processing if events are disabled
 377         return FALSE;
 378     }
 379
 380     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 381     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 382     NR::Point const event_w(bevent.x, bevent.y);
 383     NR::Point const event_dt(desktop->w2d(event_w));
 384     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 385
 386     gint ret = FALSE;
 387     if (bevent.button == 1 && !event_context->space_panning
 388         && pc->expecting_clicks_for_LPE != 1) { // when the last click for a waiting LPE occurs we want to finish the path
 389
 390
 391         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 392             return TRUE;
 393         }
 394
 395         pen_drag_origin_w = event_w;
 396         pen_within_tolerance = true;
 397
 398         /* Test whether we hit any anchor. */
 399         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 400
 401         switch (pc->mode) {
 402             case SP_PEN_CONTEXT_MODE_CLICK:
 403                 /* In click mode we add point on release */
 404                 switch (pc->state) {
 405                     case SP_PEN_CONTEXT_POINT:
 406                     case SP_PEN_CONTEXT_CONTROL:
 407                     case SP_PEN_CONTEXT_CLOSE:
 408                         break;
 409                     case SP_PEN_CONTEXT_STOP:
 410                         /* This is allowed, if we just cancelled curve */
 411                         pc->state = SP_PEN_CONTEXT_POINT;
 412                         break;
 413                     default:
 414                         break;
 415                 }
 416                 break;
 417             case SP_PEN_CONTEXT_MODE_DRAG:
 418                 switch (pc->state) {
 419                     case SP_PEN_CONTEXT_STOP:
 420                         /* This is allowed, if we just cancelled curve */
 421                     case SP_PEN_CONTEXT_POINT:
 422                         if (pc->npoints == 0) {
 423
 424                             if (bevent.state & GDK_CONTROL_MASK) {
 425                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 426                                 ret = TRUE;
 427                                 break;
 428                             }
 429
 430                             /* Set start anchor */
 431                             pc->sa = anchor;
 432                             NR::Point p;
 433                             if (anchor) {
 434
 435                                 /* Adjust point to anchor if needed */
 436                                 p = anchor->dp;
 437                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 438
 439                             } else {
 440
 441                                 // This is the first click of a new curve; deselect item so that
 442                                 // this curve is not combined with it (unless it is drawn from its
 443                                 // anchor, which is handled by the sibling branch above)
 444                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 445                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 446
 447                                     selection->clear();
 448                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 449
 450                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 451
 452                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 453                                 }
 454
 455                                 /* Create green anchor */
 456                                 p = event_dt;
 457                                 spdc_endpoint_snap(pc, p, bevent.state);
 458                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 459                             }
 460                             spdc_pen_set_initial_point(pc, p);
 461                         } else {
 462
 463                             /* Set end anchor */
 464                             pc->ea = anchor;
 465                             NR::Point p;
 466                             if (anchor) {
 467
 468                                 p = anchor->dp;
 469                                 // we hit an anchor, will finish the curve (either with or without closing)
 470                                 // in release handler
 471                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 472
 473                                 if (pc->green_anchor && pc->green_anchor->active) {
 474                                     // we clicked on the current curve start, so close it even if
 475                                     // we drag a handle away from it
 476                                     dc->green_closed = TRUE;
 477                                 }
 478                                 ret = TRUE;
 479                                 break;
 480
 481                             } else {
 482
 483                                 p = event_dt;
 484                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 485                                 spdc_pen_set_subsequent_point(pc, p, true);
 486                                 if (pc->polylines_only) {
 487                                     spdc_pen_finish_segment(pc, p, bevent.state);
 488                                 }
 489                             }
 490
 491                         }
 492                         pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
 493                         ret = TRUE;
 494                         break;
 495                     case SP_PEN_CONTEXT_CONTROL:
 496                         g_warning("Button down in CONTROL state");
 497                         break;
 498                     case SP_PEN_CONTEXT_CLOSE:
 499                         g_warning("Button down in CLOSE state");
 500                         break;
 501                     default:
 502                         break;
 503                 }
 504                 break;
 505             default:
 506                 break;
 507         }
 508     } else if (bevent.button == 3 || pc->expecting_clicks_for_LPE == 1) { // when the last click for a waiting LPE occurs we want to finish the path
 509         if (pc->npoints != 0) {
 510
 511             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 512             if (pc->green_closed) {
 513                 // finishing at the start anchor, close curve
 514                 spdc_pen_finish(pc, TRUE);
 515             } else {
 516                 // finishing at some other anchor, finish curve but not close
 517                 spdc_pen_finish(pc, FALSE);
 518             }
 519
 520             ret = TRUE;
 521         }
 522     }
 523
 524     return ret;
 525 }
 526
 527 /**
 528  * Handle motion_notify event.
 529  */
 530 static gint
 531 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 532 {
 533     gint ret = FALSE;
 534
 535     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 536
 537     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 538         // allow scrolling
 539         return FALSE;
 540     }
 541
 542     if (pc->events_disabled) {
 543         // skip motion events if pen events are disabled
 544         return FALSE;
 545     }
 546
 547     NR::Point const event_w(mevent.x,
 548                             mevent.y);
 549     if (pen_within_tolerance) {
 550         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 551                                                                "value", 0, 0, 100);
 552         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 553             return FALSE;   // Do not drag if we're within tolerance from origin.
 554         }
 555     }
 556     // Once the user has moved farther than tolerance from the original location
 557     // (indicating they intend to move the object, not click), then always process the
 558     // motion notify coordinates as given (no snapping back to origin)
 559     pen_within_tolerance = false;
 560
 561     SPDesktop *const dt = pc->desktop;
 562     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 563         /* Grab mouse, so release will not pass unnoticed */
 564         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 565         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 566                                         GDK_BUTTON_RELEASE_MASK |
 567                                         GDK_POINTER_MOTION_MASK  ),
 568                             NULL, mevent.time);
 569     }
 570
 571     /* Find desktop coordinates */
 572     NR::Point p = dt->w2d(event_w);
 573
 574     /* Test, whether we hit any anchor */
 575     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 576
 577     switch (pc->mode) {
 578         case SP_PEN_CONTEXT_MODE_CLICK:
 579             switch (pc->state) {
 580                 case SP_PEN_CONTEXT_POINT:
 581                     if ( pc->npoints != 0 ) {
 582                         /* Only set point, if we are already appending */
 583                         spdc_endpoint_snap(pc, p, mevent.state);
 584                         spdc_pen_set_subsequent_point(pc, p, true);
 585                         ret = TRUE;
 586                     }
 587                     break;
 588                 case SP_PEN_CONTEXT_CONTROL:
 589                 case SP_PEN_CONTEXT_CLOSE:
 590                     /* Placing controls is last operation in CLOSE state */
 591                     spdc_endpoint_snap(pc, p, mevent.state);
 592                     spdc_pen_set_ctrl(pc, p, mevent.state);
 593                     ret = TRUE;
 594                     break;
 595                 case SP_PEN_CONTEXT_STOP:
 596                     /* This is perfectly valid */
 597                     break;
 598                 default:
 599                     break;
 600             }
 601             break;
 602         case SP_PEN_CONTEXT_MODE_DRAG:
 603             switch (pc->state) {
 604                 case SP_PEN_CONTEXT_POINT:
 605                     if ( pc->npoints > 0 ) {
 606                         /* Only set point, if we are already appending */
 607
 608                         if (!anchor) {   /* Snap node only if not hitting anchor */
 609                             spdc_endpoint_snap(pc, p, mevent.state);
 610                         }
 611
 612                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 613
 614                         if (anchor && !pc->anchor_statusbar) {
 615                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 616                             pc->anchor_statusbar = true;
 617                         } else if (!anchor && pc->anchor_statusbar) {
 618                             pc->_message_context->clear();
 619                             pc->anchor_statusbar = false;
 620                         }
 621
 622                         ret = TRUE;
 623                     } else {
 624                         if (anchor && !pc->anchor_statusbar) {
 625                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 626                             pc->anchor_statusbar = true;
 627                         } else if (!anchor && pc->anchor_statusbar) {
 628                             pc->_message_context->clear();
 629                             pc->anchor_statusbar = false;
 630                         }
 631                     }
 632                     break;
 633                 case SP_PEN_CONTEXT_CONTROL:
 634                 case SP_PEN_CONTEXT_CLOSE:
 635                     /* Placing controls is last operation in CLOSE state */
 636
 637                     // snap the handle
 638                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 639
 640                     if (!pc->polylines_only) {
 641                         spdc_pen_set_ctrl(pc, p, mevent.state);
 642                     } else {
 643                         spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
 644                     }
 645                     gobble_motion_events(GDK_BUTTON1_MASK);
 646                     ret = TRUE;
 647                     break;
 648                 case SP_PEN_CONTEXT_STOP:
 649                     /* This is perfectly valid */
 650                     break;
 651                 default:
 652                     break;
 653             }
 654             break;
 655         default:
 656             break;
 657     }
 658     return ret;
 659 }
 660
 661 /**
 662  * Handle mouse button release event.
 663  */
 664 static gint
 665 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 666 {
 667     if (pc->events_disabled) {
 668         // skip event processing if events are disabled
 669         return FALSE;
 670     }
 671
 672     gint ret = FALSE;
 673     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 674     if ( revent.button == 1  && !event_context->space_panning) {
 675
 676         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 677
 678         NR::Point const event_w(revent.x,
 679                                 revent.y);
 680         /* Find desktop coordinates */
 681         NR::Point p = pc->desktop->w2d(event_w);
 682
 683         /* Test whether we hit any anchor. */
 684         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 685
 686         switch (pc->mode) {
 687             case SP_PEN_CONTEXT_MODE_CLICK:
 688                 switch (pc->state) {
 689                     case SP_PEN_CONTEXT_POINT:
 690                         if ( pc->npoints == 0 ) {
 691                             /* Start new thread only with button release */
 692                             if (anchor) {
 693                                 p = anchor->dp;
 694                             }
 695                             pc->sa = anchor;
 696                             spdc_pen_set_initial_point(pc, p);
 697                         } else {
 698                             /* Set end anchor here */
 699                             pc->ea = anchor;
 700                             if (anchor) {
 701                                 p = anchor->dp;
 702                             }
 703                         }
 704                         pc->state = SP_PEN_CONTEXT_CONTROL;
 705                         ret = TRUE;
 706                         break;
 707                     case SP_PEN_CONTEXT_CONTROL:
 708                         /* End current segment */
 709                         spdc_endpoint_snap(pc, p, revent.state);
 710                         spdc_pen_finish_segment(pc, p, revent.state);
 711                         pc->state = SP_PEN_CONTEXT_POINT;
 712                         ret = TRUE;
 713                         break;
 714                     case SP_PEN_CONTEXT_CLOSE:
 715                         /* End current segment */
 716                         if (!anchor) {   /* Snap node only if not hitting anchor */
 717                             spdc_endpoint_snap(pc, p, revent.state);
 718                         }
 719                         spdc_pen_finish_segment(pc, p, revent.state);
 720                         spdc_pen_finish(pc, TRUE);
 721                         pc->state = SP_PEN_CONTEXT_POINT;
 722                         ret = TRUE;
 723                         break;
 724                     case SP_PEN_CONTEXT_STOP:
 725                         /* This is allowed, if we just cancelled curve */
 726                         pc->state = SP_PEN_CONTEXT_POINT;
 727                         ret = TRUE;
 728                         break;
 729                     default:
 730                         break;
 731                 }
 732                 break;
 733             case SP_PEN_CONTEXT_MODE_DRAG:
 734                 switch (pc->state) {
 735                     case SP_PEN_CONTEXT_POINT:
 736                     case SP_PEN_CONTEXT_CONTROL:
 737                         if (!pc->polylines_only) {
 738                             spdc_endpoint_snap(pc, p, revent.state);
 739                             spdc_pen_finish_segment(pc, p, revent.state);
 740                         }
 741                         break;
 742                     case SP_PEN_CONTEXT_CLOSE:
 743                         spdc_endpoint_snap(pc, p, revent.state);
 744                         spdc_pen_finish_segment(pc, p, revent.state);
 745                         if (pc->green_closed) {
 746                             // finishing at the start anchor, close curve
 747                             spdc_pen_finish(pc, TRUE);
 748                         } else {
 749                             // finishing at some other anchor, finish curve but not close
 750                             spdc_pen_finish(pc, FALSE);
 751                         }
 752                         break;
 753                     case SP_PEN_CONTEXT_STOP:
 754                         /* This is allowed, if we just cancelled curve */
 755                         break;
 756                     default:
 757                         break;
 758                 }
 759                 pc->state = SP_PEN_CONTEXT_POINT;
 760                 ret = TRUE;
 761                 break;
 762             default:
 763                 break;
 764         }
 765
 766         if (pc->grab) {
 767             /* Release grab now */
 768             sp_canvas_item_ungrab(pc->grab, revent.time);
 769             pc->grab = NULL;
 770         }
 771
 772         ret = TRUE;
 773
 774         dc->green_closed = FALSE;
 775     }
 776
 777     // TODO: can we be sure that the path was created correctly?
 778     // TODO: should we offer an option to collect the clicks in a list?
 779     if (pc->expecting_clicks_for_LPE > 0) {
 780         --pc->expecting_clicks_for_LPE;
 781
 782         if (pc->expecting_clicks_for_LPE == 0) {
 783             pc->polylines_only = false;
 784
 785             SPEventContext *ec = SP_EVENT_CONTEXT(pc);
 786             Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
 787
 788             if (pc->waiting_LPE) {
 789                 // we have an already created LPE waiting for a path
 790                 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
 791                 selection->add(SP_OBJECT(pc->waiting_item));
 792             } else {
 793                 // the case that we need to create a new LPE and apply it to the just-drawn path is
 794                 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
 795             }
 796         }
 797     }
 798
 799     return ret;
 800 }
 801
 802 static gint
 803 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 804 {
 805     gint ret = FALSE;
 806     if (pc->npoints != 0 && bevent.button != 2) {
 807         spdc_pen_finish(pc, FALSE);
 808         ret = TRUE;
 809     }
 810     return ret;
 811 }
 812
 813 void
 814 pen_redraw_all (SPPenContext *const pc)
 815 {
 816     // green
 817     if (pc->green_bpaths) {
 818         // remove old piecewise green canvasitems
 819         while (pc->green_bpaths) {
 820             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 821             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 822         }
 823         // one canvas bpath for all of green_curve
 824         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 825         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 826         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 827
 828         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 829     }
 830
 831     if (pc->green_anchor)
 832         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 833
 834     pc->red_curve->reset();
 835     pc->red_curve->moveto(pc->p[0]);
 836     pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
 837     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 838
 839     // handles
 840     if (pc->p[0] != pc->p[1]) {
 841         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 842         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 843         sp_canvas_item_show (pc->c1);
 844         sp_canvas_item_show (pc->cl1);
 845     } else {
 846         sp_canvas_item_hide (pc->c1);
 847         sp_canvas_item_hide (pc->cl1);
 848     }
 849
 850     NArtBpath const * bpath = pc->green_curve->last_bpath();
 851     if (bpath) {
 852         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 853             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 854             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 855             sp_canvas_item_show (pc->c0);
 856             sp_canvas_item_show (pc->cl0);
 857         } else {
 858             sp_canvas_item_hide (pc->c0);
 859             sp_canvas_item_hide (pc->cl0);
 860         }
 861     }
 862 }
 863
 864 void
 865 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 866 {
 867     if (pc->npoints != 5)
 868         return;
 869
 870     // green
 871     NArtBpath const * bpath = pc->green_curve->last_bpath();
 872     if (bpath) {
 873         pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
 874     } else {
 875         // start anchor too
 876         if (pc->green_anchor) {
 877             pc->green_anchor->dp += NR::Point(x, y);
 878         }
 879     }
 880
 881     // red
 882     pc->p[0] += NR::Point(x, y);
 883     pc->p[1] += NR::Point(x, y);
 884     pen_redraw_all(pc);
 885 }
 886
 887 void
 888 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 889 {
 890     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 891 }
 892
 893 void
 894 pen_lastpoint_tocurve (SPPenContext *const pc)
 895 {
 896     if (pc->npoints != 5)
 897         return;
 898
 899     // red
 900     NArtBpath const * bpath = pc->green_curve->last_bpath();
 901     if (bpath && bpath->code == NR_CURVETO) {
 902         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 903     } else {
 904         pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
 905     }
 906
 907     pen_redraw_all(pc);
 908 }
 909
 910 void
 911 pen_lastpoint_toline (SPPenContext *const pc)
 912 {
 913     if (pc->npoints != 5)
 914         return;
 915
 916     pc->p[1] = pc->p[0];
 917
 918     pen_redraw_all(pc);
 919 }
 920
 921
 922 static gint
 923 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 924 {
 925     gint ret = FALSE;
 926     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 927
 928     switch (get_group0_keyval (&event->key)) {
 929
 930         case GDK_Left: // move last point left
 931         case GDK_KP_Left:
 932         case GDK_KP_4:
 933             if (!MOD__CTRL) { // not ctrl
 934                 if (MOD__ALT) { // alt
 935                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 936                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 937                 }
 938                 else { // no alt
 939                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 940                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 941                 }
 942                 ret = TRUE;
 943             }
 944             break;
 945         case GDK_Up: // move last point up
 946         case GDK_KP_Up:
 947         case GDK_KP_8:
 948             if (!MOD__CTRL) { // not ctrl
 949                 if (MOD__ALT) { // alt
 950                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 951                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 952                 }
 953                 else { // no alt
 954                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 955                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 956                 }
 957                 ret = TRUE;
 958             }
 959             break;
 960         case GDK_Right: // move last point right
 961         case GDK_KP_Right:
 962         case GDK_KP_6:
 963             if (!MOD__CTRL) { // not ctrl
 964                 if (MOD__ALT) { // alt
 965                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 966                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 967                 }
 968                 else { // no alt
 969                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 970                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 971                 }
 972                 ret = TRUE;
 973             }
 974             break;
 975         case GDK_Down: // move last point down
 976         case GDK_KP_Down:
 977         case GDK_KP_2:
 978             if (!MOD__CTRL) { // not ctrl
 979                 if (MOD__ALT) { // alt
 980                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 981                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 982                 }
 983                 else { // no alt
 984                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 985                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 986                 }
 987                 ret = TRUE;
 988             }
 989             break;
 990
 991         case GDK_U:
 992         case GDK_u:
 993             if (MOD__SHIFT_ONLY) {
 994                 pen_lastpoint_tocurve(pc);
 995                 ret = TRUE;
 996             }
 997             break;
 998         case GDK_L:
 999         case GDK_l:
1000             if (MOD__SHIFT_ONLY) {
1001                 pen_lastpoint_toline(pc);
1002                 ret = TRUE;
1003             }
1004             break;
1005
1006         case GDK_Return:
1007         case GDK_KP_Enter:
1008             if (pc->npoints != 0) {
1009                 spdc_pen_finish(pc, FALSE);
1010                 ret = TRUE;
1011             }
1012             break;
1013         case GDK_Escape:
1014             if (pc->npoints != 0) {
1015                 // if drawing, cancel, otherwise pass it up for deselecting
1016                 pen_cancel (pc);
1017                 ret = TRUE;
1018             }
1019             break;
1020         case GDK_z:
1021         case GDK_Z:
1022             if (MOD__CTRL_ONLY && pc->npoints != 0) {
1023                 // if drawing, cancel, otherwise pass it up for undo
1024                 pen_cancel (pc);
1025                 ret = TRUE;
1026             }
1027             break;
1028         case GDK_g:
1029         case GDK_G:
1030             if (MOD__SHIFT_ONLY) {
1031                 sp_selection_to_guides();
1032                 ret = true;
1033             }
1034             break;
1035         case GDK_BackSpace:
1036         case GDK_Delete:
1037         case GDK_KP_Delete:
1038             if (pc->green_curve->is_empty()) {
1039                 if (!pc->red_curve->is_empty()) {
1040                     pen_cancel (pc);
1041                     ret = TRUE;
1042                 } else {
1043                     // do nothing; this event should be handled upstream
1044                 }
1045             } else {
1046                 /* Reset red curve */
1047                 pc->red_curve->reset();
1048                 /* Destroy topmost green bpath */
1049                 if (pc->green_bpaths) {
1050                     if (pc->green_bpaths->data)
1051                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1052                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1053                 }
1054                 /* Get last segment */
1055                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1056                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1057                 if ( e < 2 ) {
1058                     g_warning("Green curve length is %d", e);
1059                     break;
1060                 }
1061                 pc->p[0] = p[e - 2].c(3);
1062                 if (p[e - 1].code == NR_CURVETO) {
1063                     pc->p[1] = p[e - 1].c(1);
1064                 } else {
1065                     pc->p[1] = pc->p[0];
1066                 }
1067                 NR::Point const pt(( pc->npoints < 4
1068                                      ? p[e - 1].c(3)
1069                                      : pc->p[3] ));
1070                 pc->npoints = 2;
1071                 pc->green_curve->backspace();
1072                 sp_canvas_item_hide(pc->c0);
1073                 sp_canvas_item_hide(pc->c1);
1074                 sp_canvas_item_hide(pc->cl0);
1075                 sp_canvas_item_hide(pc->cl1);
1076                 pc->state = SP_PEN_CONTEXT_POINT;
1077                 spdc_pen_set_subsequent_point(pc, pt, true);
1078                 ret = TRUE;
1079             }
1080             break;
1081         default:
1082             break;
1083     }
1084     return ret;
1085 }
1086
1087 static void
1088 spdc_reset_colors(SPPenContext *pc)
1089 {
1090     /* Red */
1091     pc->red_curve->reset();
1092     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1093     /* Blue */
1094     pc->blue_curve->reset();
1095     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1096     /* Green */
1097     while (pc->green_bpaths) {
1098         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1099         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1100     }
1101     pc->green_curve->reset();
1102     if (pc->green_anchor) {
1103         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1104     }
1105     pc->sa = NULL;
1106     pc->ea = NULL;
1107     pc->npoints = 0;
1108     pc->red_curve_is_valid = false;
1109 }
1110
1111
1112 static void
1113 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1114 {
1115     g_assert( pc->npoints == 0 );
1116
1117     pc->p[0] = p;
1118     pc->p[1] = p;
1119     pc->npoints = 2;
1120     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1121
1122     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1123 }
1124
1125 /**
1126  * Show the status message for the current line/curve segment.
1127  * This type of message always shows angle/distance as the last
1128  * two parameters ("angle %3.2f&#176;, distance %s").
1129  */
1130 static void
1131 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1132 {
1133     g_assert(pc != NULL);
1134     g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1135     g_assert(message != NULL);
1136
1137     SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1138     NR::Point rel = p - pc->p[pc_point_to_compare];
1139     GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1140     double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1141     if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1142         angle = angle_to_compass (angle);
1143
1144     pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1145     g_string_free(dist, FALSE);
1146 }
1147
1148 static void
1149 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1150 {
1151     g_assert( pc->npoints != 0 );
1152     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1153
1154     pc->p[2] = p;
1155     pc->p[3] = p;
1156     pc->p[4] = p;
1157     pc->npoints = 5;
1158     pc->red_curve->reset();
1159     pc->red_curve->moveto(pc->p[0]);
1160     bool is_curve;
1161     if (pc->p[1] != pc->p[0])
1162     {
1163         pc->red_curve->curveto(pc->p[1], p, p);
1164         is_curve = true;
1165     } else {
1166         pc->red_curve->lineto(p);
1167         is_curve = false;
1168     }
1169
1170     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1171
1172     if (statusbar) {
1173         gchar *message = is_curve ?
1174             _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1175             _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1176         spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1177     }
1178 }
1179
1180 static void
1181 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1182 {
1183     sp_canvas_item_show(pc->c1);
1184     sp_canvas_item_show(pc->cl1);
1185
1186     if ( pc->npoints == 2 ) {
1187         pc->p[1] = p;
1188         sp_canvas_item_hide(pc->c0);
1189         sp_canvas_item_hide(pc->cl0);
1190         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1191         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1192
1193         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"));
1194     } else if ( pc->npoints == 5 ) {
1195         pc->p[4] = p;
1196         sp_canvas_item_show(pc->c0);
1197         sp_canvas_item_show(pc->cl0);
1198         bool is_symm = false;
1199         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1200              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1201             NR::Point delta = p - pc->p[3];
1202             pc->p[2] = pc->p[3] - delta;
1203             is_symm = true;
1204             pc->red_curve->reset();
1205             pc->red_curve->moveto(pc->p[0]);
1206             pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1207             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1208         }
1209         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1210         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1211         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1212         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1213
1214         gchar *message = is_symm ?
1215             _("<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") :
1216             _("<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");
1217         spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1218     } else {
1219         g_warning("Something bad happened - npoints is %d", pc->npoints);
1220     }
1221 }
1222
1223 static void
1224 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1225 {
1226     if (!pc->red_curve->is_empty()) {
1227         pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1228         SPCurve *curve = pc->red_curve->copy();
1229         /// \todo fixme:
1230         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1231         curve->unref();
1232         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1233
1234         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1235
1236         pc->p[0] = pc->p[3];
1237         pc->p[1] = pc->p[4];
1238         pc->npoints = 2;
1239
1240         pc->red_curve->reset();
1241     }
1242 }
1243
1244 static void
1245 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1246 {
1247     if (pc->expecting_clicks_for_LPE > 1) {
1248         // don't let the path be finished before we have collected the required number of mouse clicks
1249         return;
1250     }
1251
1252     pen_disable_events(pc);
1253
1254     SPDesktop *const desktop = pc->desktop;
1255     pc->_message_context->clear();
1256     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1257
1258     pc->red_curve->reset();
1259     spdc_concat_colors_and_flush(pc, closed);
1260     pc->sa = NULL;
1261     pc->ea = NULL;
1262
1263     pc->npoints = 0;
1264     pc->state = SP_PEN_CONTEXT_POINT;
1265
1266     sp_canvas_item_hide(pc->c0);
1267     sp_canvas_item_hide(pc->c1);
1268     sp_canvas_item_hide(pc->cl0);
1269     sp_canvas_item_hide(pc->cl1);
1270
1271     if (pc->green_anchor) {
1272         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1273     }
1274
1275
1276     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1277
1278     pen_enable_events(pc);
1279 }
1280
1281 static void
1282 pen_disable_events(SPPenContext *const pc) {
1283   pc->events_disabled++;
1284 }
1285
1286 static void
1287 pen_enable_events(SPPenContext *const pc) {
1288   g_return_if_fail(pc->events_disabled != 0);
1289
1290   pc->events_disabled--;
1291 }
1292
1293 /*
1294   Local Variables:
1295   mode:c++
1296   c-file-style:"stroustrup"
1297   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1298   indent-tabs-mode:nil
1299   fill-column:99
1300   End:
1301 */
1302 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :