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