src/pen-context.cpp

   1 /** \file
   2  * Pen event context implementation.
   3  */
   4
   5 /*
   6  * Authors:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *   bulia byak <buliabyak@users.sf.net>
   9  *
  10  * Copyright (C) 2000 Lauris Kaplinski
  11  * Copyright (C) 2000-2001 Ximian, Inc.
  12  * Copyright (C) 2002 Lauris Kaplinski
  13  * Copyright (C) 2004 Monash University
  14  *
  15  * Released under GNU GPL, read the file 'COPYING' for more information
  16  */
  17
  18 #include <gdk/gdkkeysyms.h>
  19 #include <cstring>
  20 #include <string>
  21
  22 #include "pen-context.h"
  23 #include "sp-namedview.h"
  24 #include "sp-metrics.h"
  25 #include "desktop.h"
  26 #include "desktop-handles.h"
  27 #include "selection.h"
  28 #include "selection-chemistry.h"
  29 #include "draw-anchor.h"
  30 #include "message-stack.h"
  31 #include "message-context.h"
  32 #include "prefs-utils.h"
  33 #include "sp-path.h"
  34 #include "display/curve.h"
  35 #include "pixmaps/cursor-pen.xpm"
  36 #include "display/canvas-bpath.h"
  37 #include "display/sp-ctrlline.h"
  38 #include "display/sodipodi-ctrl.h"
  39 #include <glibmm/i18n.h>
  40 #include "libnr/n-art-bpath.h"
  41 #include "libnr/nr-point-ops.h"
  42 #include "helper/units.h"
  43 #include "macros.h"
  44 #include "context-fns.h"
  45
  46 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     pc->polylines_only = false;
 149     pc->waiting_LPE = NULL;
 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     pc->waiting_LPE = NULL;
 183     if (pc->expecting_clicks_for_LPE > 0) {
 184         // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
 185         sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
 186     }
 187 }
 188
 189 /**
 190  * Callback to initialize SPPenContext object.
 191  */
 192 static void
 193 sp_pen_context_setup(SPEventContext *ec)
 194 {
 195     SPPenContext *pc;
 196
 197     pc = SP_PEN_CONTEXT(ec);
 198
 199     if (((SPEventContextClass *) pen_parent_class)->setup) {
 200         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 201     }
 202
 203     /* Pen indicators */
 204     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 205                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 206     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 207                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 208     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 209     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 210     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 211     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 212
 213     sp_canvas_item_hide(pc->c0);
 214     sp_canvas_item_hide(pc->c1);
 215     sp_canvas_item_hide(pc->cl0);
 216     sp_canvas_item_hide(pc->cl1);
 217
 218     sp_event_context_read(ec, "mode");
 219
 220     pc->anchor_statusbar = false;
 221
 222     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 223         ec->enableSelectionCue();
 224     }
 225 }
 226
 227 static void
 228 pen_cancel (SPPenContext *const pc)
 229 {
 230     pc->state = SP_PEN_CONTEXT_STOP;
 231     spdc_reset_colors(pc);
 232     sp_canvas_item_hide(pc->c0);
 233     sp_canvas_item_hide(pc->c1);
 234     sp_canvas_item_hide(pc->cl0);
 235     sp_canvas_item_hide(pc->cl1);
 236     pc->_message_context->clear();
 237     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 238
 239     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 240 }
 241
 242 /**
 243  * Finalization callback.
 244  */
 245 static void
 246 sp_pen_context_finish(SPEventContext *ec)
 247 {
 248     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 249
 250     if (pc->npoints != 0) {
 251         pen_cancel (pc);
 252     }
 253
 254     if (((SPEventContextClass *) pen_parent_class)->finish) {
 255         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 256     }
 257 }
 258
 259 /**
 260  * Callback that sets key to value in pen context.
 261  */
 262 static void
 263 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 264 {
 265     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 266
 267     if (!strcmp(key, "mode")) {
 268         if ( val && !strcmp(val, "drag") ) {
 269             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 270         } else {
 271             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 272         }
 273     }
 274 }
 275
 276 /**
 277  * Snaps new node relative to the previous node.
 278  */
 279 static void
 280 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 281 {
 282     if (pc->npoints > 0) {
 283         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 284     }
 285
 286     spdc_endpoint_snap_free(pc, p, state);
 287 }
 288
 289 /**
 290  * Snaps new node's handle relative to the new node.
 291  */
 292 static void
 293 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 294 {
 295     g_return_if_fail(( pc->npoints == 2 ||
 296                        pc->npoints == 5   ));
 297
 298     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 299     spdc_endpoint_snap_free(pc, p, state);
 300 }
 301
 302 static gint
 303 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 304 {
 305     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 306
 307     gint ret = FALSE;
 308
 309     switch (event->type) {
 310         case GDK_BUTTON_PRESS:
 311             ret = pen_handle_button_press(pc, event->button);
 312             break;
 313         case GDK_BUTTON_RELEASE:
 314             ret = pen_handle_button_release(pc, event->button);
 315             break;
 316         default:
 317             break;
 318     }
 319
 320     if (!ret) {
 321         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 322             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 323     }
 324
 325     return ret;
 326 }
 327
 328 /**
 329  * Callback to handle all pen events.
 330  */
 331 static gint
 332 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 333 {
 334     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 335
 336     gint ret = FALSE;
 337
 338     switch (event->type) {
 339         case GDK_BUTTON_PRESS:
 340             ret = pen_handle_button_press(pc, event->button);
 341             break;
 342
 343         case GDK_MOTION_NOTIFY:
 344             ret = pen_handle_motion_notify(pc, event->motion);
 345             break;
 346
 347         case GDK_BUTTON_RELEASE:
 348             ret = pen_handle_button_release(pc, event->button);
 349             break;
 350
 351         case GDK_2BUTTON_PRESS:
 352             ret = pen_handle_2button_press(pc, event->button);
 353             break;
 354
 355         case GDK_KEY_PRESS:
 356             ret = pen_handle_key_press(pc, event);
 357             break;
 358
 359         default:
 360             break;
 361     }
 362
 363     if (!ret) {
 364         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 365             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 366         if (parent_root_handler) {
 367             ret = parent_root_handler(ec, event);
 368         }
 369     }
 370
 371     return ret;
 372 }
 373
 374 /**
 375  * Handle mouse button press event.
 376  */
 377 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 378 {
 379     if (pc->events_disabled) {
 380         // skip event processing if events are disabled
 381         return FALSE;
 382     }
 383
 384     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 385     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 386     NR::Point const event_w(bevent.x, bevent.y);
 387     NR::Point const event_dt(desktop->w2d(event_w));
 388     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 389
 390     gint ret = FALSE;
 391     if (bevent.button == 1 && !event_context->space_panning
 392         // when the last click for a waiting LPE occurs we want to finish the path
 393         && pc->expecting_clicks_for_LPE != 1) {
 394
 395         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 396             return TRUE;
 397         }
 398
 399         if (!pc->grab ) {
 400             /* Grab mouse, so release will not pass unnoticed */
 401             pc->grab = SP_CANVAS_ITEM(desktop->acetate);
 402             sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 403                                             GDK_BUTTON_RELEASE_MASK |
 404                                             GDK_POINTER_MOTION_MASK  ),
 405                                 NULL, bevent.time);
 406         }
 407
 408         pen_drag_origin_w = event_w;
 409         pen_within_tolerance = true;
 410
 411         /* Test whether we hit any anchor. */
 412         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 413
 414         switch (pc->mode) {
 415             case SP_PEN_CONTEXT_MODE_CLICK:
 416                 /* In click mode we add point on release */
 417                 switch (pc->state) {
 418                     case SP_PEN_CONTEXT_POINT:
 419                     case SP_PEN_CONTEXT_CONTROL:
 420                     case SP_PEN_CONTEXT_CLOSE:
 421                         break;
 422                     case SP_PEN_CONTEXT_STOP:
 423                         /* This is allowed, if we just cancelled curve */
 424                         pc->state = SP_PEN_CONTEXT_POINT;
 425                         break;
 426                     default:
 427                         break;
 428                 }
 429                 break;
 430             case SP_PEN_CONTEXT_MODE_DRAG:
 431                 switch (pc->state) {
 432                     case SP_PEN_CONTEXT_STOP:
 433                         /* This is allowed, if we just cancelled curve */
 434                     case SP_PEN_CONTEXT_POINT:
 435                         if (pc->npoints == 0) {
 436
 437                             if (bevent.state & GDK_CONTROL_MASK) {
 438                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 439                                 ret = TRUE;
 440                                 break;
 441                             }
 442
 443                             // TODO: Perhaps it would be nicer to rearrange the following case
 444                             // distinction so that the case of a waiting LPE is treated separately
 445
 446                             /* Set start anchor */
 447                             pc->sa = anchor;
 448                             NR::Point p;
 449                             if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
 450                                 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
 451                                    a fresh path to be created so don't continue an existing one */
 452                                 p = anchor->dp;
 453                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 454                             } else {
 455                                 // This is the first click of a new curve; deselect item so that
 456                                 // this curve is not combined with it (unless it is drawn from its
 457                                 // anchor, which is handled by the sibling branch above)
 458                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 459                                 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
 460                                     /* if we have a waiting LPE, we need a fresh path to be created
 461                                        so don't append to an existing one */
 462                                     selection->clear();
 463                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 464                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 465                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 466                                 }
 467
 468                                 /* Create green anchor */
 469                                 p = event_dt;
 470                                 spdc_endpoint_snap(pc, p, bevent.state);
 471                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 472                             }
 473                             spdc_pen_set_initial_point(pc, p);
 474                         } else {
 475
 476                             /* Set end anchor */
 477                             pc->ea = anchor;
 478                             NR::Point p;
 479                             if (anchor) {
 480                                 p = anchor->dp;
 481                                 // we hit an anchor, will finish the curve (either with or without closing)
 482                                 // in release handler
 483                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 484
 485                                 if (pc->green_anchor && pc->green_anchor->active) {
 486                                     // we clicked on the current curve start, so close it even if
 487                                     // we drag a handle away from it
 488                                     dc->green_closed = TRUE;
 489                                 }
 490                                 ret = TRUE;
 491                                 break;
 492
 493                             } else {
 494                                 p = event_dt;
 495                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 496                                 spdc_pen_set_subsequent_point(pc, p, true);
 497                                 if (pc->polylines_only) {
 498                                     spdc_pen_finish_segment(pc, p, bevent.state);
 499                                 }
 500                             }
 501                         }
 502
 503                         pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
 504                         ret = TRUE;
 505                         break;
 506                     case SP_PEN_CONTEXT_CONTROL:
 507                         g_warning("Button down in CONTROL state");
 508                         break;
 509                     case SP_PEN_CONTEXT_CLOSE:
 510                         g_warning("Button down in CLOSE state");
 511                         break;
 512                     default:
 513                         break;
 514                 }
 515                 break;
 516             default:
 517                 break;
 518         }
 519     } 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
 520         if (pc->npoints != 0) {
 521
 522             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 523             if (pc->green_closed) {
 524                 // finishing at the start anchor, close curve
 525                 spdc_pen_finish(pc, TRUE);
 526             } else {
 527                 // finishing at some other anchor, finish curve but not close
 528                 spdc_pen_finish(pc, FALSE);
 529             }
 530
 531             ret = TRUE;
 532         }
 533     }
 534
 535     if (pc->expecting_clicks_for_LPE) {
 536         --pc->expecting_clicks_for_LPE;
 537     }
 538
 539     return ret;
 540 }
 541
 542 /**
 543  * Handle motion_notify event.
 544  */
 545 static gint
 546 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 547 {
 548     gint ret = FALSE;
 549
 550     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 551     SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
 552
 553     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 554         // allow scrolling
 555         return FALSE;
 556     }
 557
 558     if (pc->events_disabled) {
 559         // skip motion events if pen events are disabled
 560         return FALSE;
 561     }
 562
 563     NR::Point const event_w(mevent.x,
 564                             mevent.y);
 565     if (pen_within_tolerance) {
 566         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 567                                                                "value", 0, 0, 100);
 568         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 569             return FALSE;   // Do not drag if we're within tolerance from origin.
 570         }
 571     }
 572     // Once the user has moved farther than tolerance from the original location
 573     // (indicating they intend to move the object, not click), then always process the
 574     // motion notify coordinates as given (no snapping back to origin)
 575     pen_within_tolerance = false;
 576
 577     /* Find desktop coordinates */
 578     NR::Point p = dt->w2d(event_w);
 579
 580     /* Test, whether we hit any anchor */
 581     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 582
 583     switch (pc->mode) {
 584         case SP_PEN_CONTEXT_MODE_CLICK:
 585             switch (pc->state) {
 586                 case SP_PEN_CONTEXT_POINT:
 587                     if ( pc->npoints != 0 ) {
 588                         /* Only set point, if we are already appending */
 589                         spdc_endpoint_snap(pc, p, mevent.state);
 590                         spdc_pen_set_subsequent_point(pc, p, true);
 591                         ret = TRUE;
 592                     }
 593                     break;
 594                 case SP_PEN_CONTEXT_CONTROL:
 595                 case SP_PEN_CONTEXT_CLOSE:
 596                     /* Placing controls is last operation in CLOSE state */
 597                     spdc_endpoint_snap(pc, p, mevent.state);
 598                     spdc_pen_set_ctrl(pc, p, mevent.state);
 599                     ret = TRUE;
 600                     break;
 601                 case SP_PEN_CONTEXT_STOP:
 602                     /* This is perfectly valid */
 603                     break;
 604                 default:
 605                     break;
 606             }
 607             break;
 608         case SP_PEN_CONTEXT_MODE_DRAG:
 609             switch (pc->state) {
 610                 case SP_PEN_CONTEXT_POINT:
 611                     if ( pc->npoints > 0 ) {
 612                         /* Only set point, if we are already appending */
 613
 614                         if (!anchor) {   /* Snap node only if not hitting anchor */
 615                             spdc_endpoint_snap(pc, p, mevent.state);
 616                         }
 617
 618                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 619
 620                         if (anchor && !pc->anchor_statusbar) {
 621                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 622                             pc->anchor_statusbar = true;
 623                         } else if (!anchor && pc->anchor_statusbar) {
 624                             pc->_message_context->clear();
 625                             pc->anchor_statusbar = false;
 626                         }
 627
 628                         ret = TRUE;
 629                     } else {
 630                         if (anchor && !pc->anchor_statusbar) {
 631                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 632                             pc->anchor_statusbar = true;
 633                         } else if (!anchor && pc->anchor_statusbar) {
 634                             pc->_message_context->clear();
 635                             pc->anchor_statusbar = false;
 636                         }
 637                     }
 638                     break;
 639                 case SP_PEN_CONTEXT_CONTROL:
 640                 case SP_PEN_CONTEXT_CLOSE:
 641                     /* Placing controls is last operation in CLOSE state */
 642
 643                     // snap the handle
 644                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 645
 646                     if (!pc->polylines_only) {
 647                         spdc_pen_set_ctrl(pc, p, mevent.state);
 648                     } else {
 649                         spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
 650                     }
 651                     gobble_motion_events(GDK_BUTTON1_MASK);
 652                     ret = TRUE;
 653                     break;
 654                 case SP_PEN_CONTEXT_STOP:
 655                     /* This is perfectly valid */
 656                     break;
 657                 default:
 658                     break;
 659             }
 660             break;
 661         default:
 662             break;
 663     }
 664     return ret;
 665 }
 666
 667 /**
 668  * Handle mouse button release event.
 669  */
 670 static gint
 671 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 672 {
 673     if (pc->events_disabled) {
 674         // skip event processing if events are disabled
 675         return FALSE;
 676     }
 677
 678     gint ret = FALSE;
 679     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 680     if ( revent.button == 1  && !event_context->space_panning) {
 681
 682         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 683
 684         NR::Point const event_w(revent.x,
 685                                 revent.y);
 686         /* Find desktop coordinates */
 687         NR::Point p = pc->desktop->w2d(event_w);
 688
 689         /* Test whether we hit any anchor. */
 690         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 691
 692         switch (pc->mode) {
 693             case SP_PEN_CONTEXT_MODE_CLICK:
 694                 switch (pc->state) {
 695                     case SP_PEN_CONTEXT_POINT:
 696                         if ( pc->npoints == 0 ) {
 697                             /* Start new thread only with button release */
 698                             if (anchor) {
 699                                 p = anchor->dp;
 700                             }
 701                             pc->sa = anchor;
 702                             spdc_pen_set_initial_point(pc, p);
 703                         } else {
 704                             /* Set end anchor here */
 705                             pc->ea = anchor;
 706                             if (anchor) {
 707                                 p = anchor->dp;
 708                             }
 709                         }
 710                         pc->state = SP_PEN_CONTEXT_CONTROL;
 711                         ret = TRUE;
 712                         break;
 713                     case SP_PEN_CONTEXT_CONTROL:
 714                         /* End current segment */
 715                         spdc_endpoint_snap(pc, p, revent.state);
 716                         spdc_pen_finish_segment(pc, p, revent.state);
 717                         pc->state = SP_PEN_CONTEXT_POINT;
 718                         ret = TRUE;
 719                         break;
 720                     case SP_PEN_CONTEXT_CLOSE:
 721                         /* End current segment */
 722                         if (!anchor) {   /* Snap node only if not hitting anchor */
 723                             spdc_endpoint_snap(pc, p, revent.state);
 724                         }
 725                         spdc_pen_finish_segment(pc, p, revent.state);
 726                         spdc_pen_finish(pc, TRUE);
 727                         pc->state = SP_PEN_CONTEXT_POINT;
 728                         ret = TRUE;
 729                         break;
 730                     case SP_PEN_CONTEXT_STOP:
 731                         /* This is allowed, if we just cancelled curve */
 732                         pc->state = SP_PEN_CONTEXT_POINT;
 733                         ret = TRUE;
 734                         break;
 735                     default:
 736                         break;
 737                 }
 738                 break;
 739             case SP_PEN_CONTEXT_MODE_DRAG:
 740                 switch (pc->state) {
 741                     case SP_PEN_CONTEXT_POINT:
 742                     case SP_PEN_CONTEXT_CONTROL:
 743                         if (!pc->polylines_only) {
 744                             spdc_endpoint_snap(pc, p, revent.state);
 745                             spdc_pen_finish_segment(pc, p, revent.state);
 746                         }
 747                         break;
 748                     case SP_PEN_CONTEXT_CLOSE:
 749                         spdc_endpoint_snap(pc, p, revent.state);
 750                         spdc_pen_finish_segment(pc, p, revent.state);
 751                         if (pc->green_closed) {
 752                             // finishing at the start anchor, close curve
 753                             spdc_pen_finish(pc, TRUE);
 754                         } else {
 755                             // finishing at some other anchor, finish curve but not close
 756                             spdc_pen_finish(pc, FALSE);
 757                         }
 758                         break;
 759                     case SP_PEN_CONTEXT_STOP:
 760                         /* This is allowed, if we just cancelled curve */
 761                         break;
 762                     default:
 763                         break;
 764                 }
 765                 pc->state = SP_PEN_CONTEXT_POINT;
 766                 ret = TRUE;
 767                 break;
 768             default:
 769                 break;
 770         }
 771
 772         if (pc->grab) {
 773             /* Release grab now */
 774             sp_canvas_item_ungrab(pc->grab, revent.time);
 775             pc->grab = NULL;
 776         }
 777
 778         ret = TRUE;
 779
 780         dc->green_closed = FALSE;
 781     }
 782
 783     // TODO: can we be sure that the path was created correctly?
 784     // TODO: should we offer an option to collect the clicks in a list?
 785     if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
 786         pc->polylines_only = false;
 787
 788         SPEventContext *ec = SP_EVENT_CONTEXT(pc);
 789         Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
 790
 791         if (pc->waiting_LPE) {
 792             // we have an already created LPE waiting for a path
 793             pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
 794             selection->add(SP_OBJECT(pc->waiting_item));
 795             pc->waiting_LPE = NULL;
 796             pc->polylines_only = false;
 797         } else {
 798             // the case that we need to create a new LPE and apply it to the just-drawn path is
 799             // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
 800         }
 801     }
 802
 803     return ret;
 804 }
 805
 806 static gint
 807 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 808 {
 809     gint ret = FALSE;
 810     if (pc->npoints != 0 && bevent.button != 2) {
 811         spdc_pen_finish(pc, FALSE);
 812         ret = TRUE;
 813     }
 814     return ret;
 815 }
 816
 817 void
 818 pen_redraw_all (SPPenContext *const pc)
 819 {
 820     // green
 821     if (pc->green_bpaths) {
 822         // remove old piecewise green canvasitems
 823         while (pc->green_bpaths) {
 824             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 825             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 826         }
 827         // one canvas bpath for all of green_curve
 828         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 829         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 830         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 831
 832         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 833     }
 834
 835     if (pc->green_anchor)
 836         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 837
 838     pc->red_curve->reset();
 839     pc->red_curve->moveto(pc->p[0]);
 840     pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
 841     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 842
 843     // handles
 844     if (pc->p[0] != pc->p[1]) {
 845         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 846         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 847         sp_canvas_item_show (pc->c1);
 848         sp_canvas_item_show (pc->cl1);
 849     } else {
 850         sp_canvas_item_hide (pc->c1);
 851         sp_canvas_item_hide (pc->cl1);
 852     }
 853
 854     Geom::Curve const * last_seg = pc->green_curve->last_segment();
 855     if (last_seg) {
 856         Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
 857         if ( cubic &&
 858              (*cubic)[2] != to_2geom(pc->p[0]) )
 859         {
 860             NR::Point p2 = from_2geom((*cubic)[2]);
 861             SP_CTRL(pc->c0)->moveto(p2);
 862             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
 863             sp_canvas_item_show (pc->c0);
 864             sp_canvas_item_show (pc->cl0);
 865         } else {
 866             sp_canvas_item_hide (pc->c0);
 867             sp_canvas_item_hide (pc->cl0);
 868         }
 869     }
 870 }
 871
 872 void
 873 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 874 {
 875     if (pc->npoints != 5)
 876         return;
 877
 878     // green
 879     if (!pc->green_curve->is_empty()) {
 880         pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
 881     } else {
 882         // start anchor too
 883         if (pc->green_anchor) {
 884             pc->green_anchor->dp += NR::Point(x, y);
 885         }
 886     }
 887
 888     // red
 889     pc->p[0] += NR::Point(x, y);
 890     pc->p[1] += NR::Point(x, y);
 891     pen_redraw_all(pc);
 892 }
 893
 894 void
 895 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 896 {
 897     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 898 }
 899
 900 void
 901 pen_lastpoint_tocurve (SPPenContext *const pc)
 902 {
 903     if (pc->npoints != 5)
 904         return;
 905
 906     Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
 907     if ( cubic ) {
 908         pc->p[1] = pc->p[0] + from_2geom( (*cubic)[3] - (*cubic)[2] );
 909     } else {
 910         pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
 911     }
 912
 913     pen_redraw_all(pc);
 914 }
 915
 916 void
 917 pen_lastpoint_toline (SPPenContext *const pc)
 918 {
 919     if (pc->npoints != 5)
 920         return;
 921
 922     pc->p[1] = pc->p[0];
 923
 924     pen_redraw_all(pc);
 925 }
 926
 927
 928 static gint
 929 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 930 {
 931     gint ret = FALSE;
 932     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 933
 934     switch (get_group0_keyval (&event->key)) {
 935
 936         case GDK_Left: // move last point left
 937         case GDK_KP_Left:
 938         case GDK_KP_4:
 939             if (!MOD__CTRL) { // not ctrl
 940                 if (MOD__ALT) { // alt
 941                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 942                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 943                 }
 944                 else { // no alt
 945                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 946                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 947                 }
 948                 ret = TRUE;
 949             }
 950             break;
 951         case GDK_Up: // move last point up
 952         case GDK_KP_Up:
 953         case GDK_KP_8:
 954             if (!MOD__CTRL) { // not ctrl
 955                 if (MOD__ALT) { // alt
 956                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 957                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 958                 }
 959                 else { // no alt
 960                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 961                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 962                 }
 963                 ret = TRUE;
 964             }
 965             break;
 966         case GDK_Right: // move last point right
 967         case GDK_KP_Right:
 968         case GDK_KP_6:
 969             if (!MOD__CTRL) { // not ctrl
 970                 if (MOD__ALT) { // alt
 971                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 972                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 973                 }
 974                 else { // no alt
 975                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 976                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 977                 }
 978                 ret = TRUE;
 979             }
 980             break;
 981         case GDK_Down: // move last point down
 982         case GDK_KP_Down:
 983         case GDK_KP_2:
 984             if (!MOD__CTRL) { // not ctrl
 985                 if (MOD__ALT) { // alt
 986                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 987                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 988                 }
 989                 else { // no alt
 990                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 991                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 992                 }
 993                 ret = TRUE;
 994             }
 995             break;
 996
 997         case GDK_P:
 998         case GDK_p:
 999             if (MOD__SHIFT_ONLY) {
1000                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1001                 ret = TRUE;
1002             }
1003             break;
1004
1005         case GDK_C:
1006         case GDK_c:
1007             if (MOD__SHIFT_ONLY) {
1008                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1009                 ret = TRUE;
1010             }
1011             break;
1012
1013         case GDK_B:
1014         case GDK_b:
1015             if (MOD__SHIFT_ONLY) {
1016                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1017                 ret = TRUE;
1018             }
1019             break;
1020
1021         case GDK_A:
1022         case GDK_a:
1023             if (MOD__SHIFT_ONLY) {
1024                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1025                 ret = TRUE;
1026             }
1027             break;
1028
1029         case GDK_U:
1030         case GDK_u:
1031             if (MOD__SHIFT_ONLY) {
1032                 pen_lastpoint_tocurve(pc);
1033                 ret = TRUE;
1034             }
1035             break;
1036         case GDK_L:
1037         case GDK_l:
1038             if (MOD__SHIFT_ONLY) {
1039                 pen_lastpoint_toline(pc);
1040                 ret = TRUE;
1041             }
1042             break;
1043
1044         case GDK_Return:
1045         case GDK_KP_Enter:
1046             if (pc->npoints != 0) {
1047                 spdc_pen_finish(pc, FALSE);
1048                 ret = TRUE;
1049             }
1050             break;
1051         case GDK_Escape:
1052             if (pc->npoints != 0) {
1053                 // if drawing, cancel, otherwise pass it up for deselecting
1054                 pen_cancel (pc);
1055                 ret = TRUE;
1056             }
1057             break;
1058         case GDK_z:
1059         case GDK_Z:
1060             if (MOD__CTRL_ONLY && pc->npoints != 0) {
1061                 // if drawing, cancel, otherwise pass it up for undo
1062                 pen_cancel (pc);
1063                 ret = TRUE;
1064             }
1065             break;
1066         case GDK_g:
1067         case GDK_G:
1068             if (MOD__SHIFT_ONLY) {
1069                 sp_selection_to_guides();
1070                 ret = true;
1071             }
1072             break;
1073         case GDK_BackSpace:
1074         case GDK_Delete:
1075         case GDK_KP_Delete:
1076             if (pc->green_curve->is_empty()) {
1077                 if (!pc->red_curve->is_empty()) {
1078                     pen_cancel (pc);
1079                     ret = TRUE;
1080                 } else {
1081                     // do nothing; this event should be handled upstream
1082                 }
1083             } else {
1084                 /* Reset red curve */
1085                 pc->red_curve->reset();
1086                 /* Destroy topmost green bpath */
1087                 if (pc->green_bpaths) {
1088                     if (pc->green_bpaths->data)
1089                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1090                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1091                 }
1092                 /* Get last segment */
1093                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1094                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1095                 if ( e < 2 ) {
1096                     g_warning("Green curve length is %d", e);
1097                     break;
1098                 }
1099                 pc->p[0] = p[e - 2].c(3);
1100                 if (p[e - 1].code == NR_CURVETO) {
1101                     pc->p[1] = p[e - 1].c(1);
1102                 } else {
1103                     pc->p[1] = pc->p[0];
1104                 }
1105                 NR::Point const pt(( pc->npoints < 4
1106                                      ? p[e - 1].c(3)
1107                                      : pc->p[3] ));
1108                 pc->npoints = 2;
1109                 pc->green_curve->backspace();
1110                 sp_canvas_item_hide(pc->c0);
1111                 sp_canvas_item_hide(pc->c1);
1112                 sp_canvas_item_hide(pc->cl0);
1113                 sp_canvas_item_hide(pc->cl1);
1114                 pc->state = SP_PEN_CONTEXT_POINT;
1115                 spdc_pen_set_subsequent_point(pc, pt, true);
1116                 ret = TRUE;
1117             }
1118             break;
1119         default:
1120             break;
1121     }
1122     return ret;
1123 }
1124
1125 static void
1126 spdc_reset_colors(SPPenContext *pc)
1127 {
1128     /* Red */
1129     pc->red_curve->reset();
1130     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1131     /* Blue */
1132     pc->blue_curve->reset();
1133     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1134     /* Green */
1135     while (pc->green_bpaths) {
1136         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1137         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1138     }
1139     pc->green_curve->reset();
1140     if (pc->green_anchor) {
1141         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1142     }
1143     pc->sa = NULL;
1144     pc->ea = NULL;
1145     pc->npoints = 0;
1146     pc->red_curve_is_valid = false;
1147 }
1148
1149
1150 static void
1151 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1152 {
1153     g_assert( pc->npoints == 0 );
1154
1155     pc->p[0] = p;
1156     pc->p[1] = p;
1157     pc->npoints = 2;
1158     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1159
1160     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1161 }
1162
1163 /**
1164  * Show the status message for the current line/curve segment.
1165  * This type of message always shows angle/distance as the last
1166  * two parameters ("angle %3.2f&#176;, distance %s").
1167  */
1168 static void
1169 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1170 {
1171     g_assert(pc != NULL);
1172     g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1173     g_assert(message != NULL);
1174
1175     SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1176     NR::Point rel = p - pc->p[pc_point_to_compare];
1177     GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1178     double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1179     if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1180         angle = angle_to_compass (angle);
1181
1182     pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1183     g_string_free(dist, FALSE);
1184 }
1185
1186 static void
1187 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1188 {
1189     g_assert( pc->npoints != 0 );
1190     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1191
1192     pc->p[2] = p;
1193     pc->p[3] = p;
1194     pc->p[4] = p;
1195     pc->npoints = 5;
1196     pc->red_curve->reset();
1197     pc->red_curve->moveto(pc->p[0]);
1198     bool is_curve;
1199     if (pc->p[1] != pc->p[0])
1200     {
1201         pc->red_curve->curveto(pc->p[1], p, p);
1202         is_curve = true;
1203     } else {
1204         pc->red_curve->lineto(p);
1205         is_curve = false;
1206     }
1207
1208     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1209
1210     if (statusbar) {
1211         gchar *message = is_curve ?
1212             _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1213             _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1214         spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1215     }
1216 }
1217
1218 static void
1219 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1220 {
1221     sp_canvas_item_show(pc->c1);
1222     sp_canvas_item_show(pc->cl1);
1223
1224     if ( pc->npoints == 2 ) {
1225         pc->p[1] = p;
1226         sp_canvas_item_hide(pc->c0);
1227         sp_canvas_item_hide(pc->cl0);
1228         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1229         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1230
1231         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"));
1232     } else if ( pc->npoints == 5 ) {
1233         pc->p[4] = p;
1234         sp_canvas_item_show(pc->c0);
1235         sp_canvas_item_show(pc->cl0);
1236         bool is_symm = false;
1237         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1238              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1239             NR::Point delta = p - pc->p[3];
1240             pc->p[2] = pc->p[3] - delta;
1241             is_symm = true;
1242             pc->red_curve->reset();
1243             pc->red_curve->moveto(pc->p[0]);
1244             pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1245             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1246         }
1247         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1248         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1249         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1250         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1251
1252         gchar *message = is_symm ?
1253             _("<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") :
1254             _("<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");
1255         spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1256     } else {
1257         g_warning("Something bad happened - npoints is %d", pc->npoints);
1258     }
1259 }
1260
1261 static void
1262 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1263 {
1264     if (!pc->red_curve->is_empty()) {
1265         pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1266         SPCurve *curve = pc->red_curve->copy();
1267         /// \todo fixme:
1268         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1269         curve->unref();
1270         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1271
1272         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1273
1274         pc->p[0] = pc->p[3];
1275         pc->p[1] = pc->p[4];
1276         pc->npoints = 2;
1277
1278         pc->red_curve->reset();
1279     }
1280 }
1281
1282 static void
1283 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1284 {
1285     if (pc->expecting_clicks_for_LPE > 1) {
1286         // don't let the path be finished before we have collected the required number of mouse clicks
1287         return;
1288     }
1289
1290     pen_disable_events(pc);
1291
1292     SPDesktop *const desktop = pc->desktop;
1293     pc->_message_context->clear();
1294     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1295
1296     pc->red_curve->reset();
1297     spdc_concat_colors_and_flush(pc, closed);
1298     pc->sa = NULL;
1299     pc->ea = NULL;
1300
1301     pc->npoints = 0;
1302     pc->state = SP_PEN_CONTEXT_POINT;
1303
1304     sp_canvas_item_hide(pc->c0);
1305     sp_canvas_item_hide(pc->c1);
1306     sp_canvas_item_hide(pc->cl0);
1307     sp_canvas_item_hide(pc->cl1);
1308
1309     if (pc->green_anchor) {
1310         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1311     }
1312
1313
1314     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1315
1316     pen_enable_events(pc);
1317 }
1318
1319 static void
1320 pen_disable_events(SPPenContext *const pc) {
1321   pc->events_disabled++;
1322 }
1323
1324 static void
1325 pen_enable_events(SPPenContext *const pc) {
1326   g_return_if_fail(pc->events_disabled != 0);
1327
1328   pc->events_disabled--;
1329 }
1330
1331 void
1332 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1333                                          unsigned int num_clicks, bool use_polylines)
1334 {
1335     g_print ("Now waiting for %s to be applied\n",
1336              Inkscape::LivePathEffect::LPETypeConverter.get_label(effect_type).c_str());
1337     pc->expecting_clicks_for_LPE = num_clicks;
1338     pc->polylines_only = use_polylines;
1339     pc->waiting_LPE_type = effect_type;
1340 }
1341
1342 /*
1343   Local Variables:
1344   mode:c++
1345   c-file-style:"stroustrup"
1346   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1347   indent-tabs-mode:nil
1348   fill-column:99
1349   End:
1350 */
1351 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :