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/nr-point-ops.h"
  41 #include "helper/units.h"
  42 #include "macros.h"
  43 #include "context-fns.h"
  44
  45 static void sp_pen_context_class_init(SPPenContextClass *klass);
  46 static void sp_pen_context_init(SPPenContext *pc);
  47 static void sp_pen_context_dispose(GObject *object);
  48
  49 static void sp_pen_context_setup(SPEventContext *ec);
  50 static void sp_pen_context_finish(SPEventContext *ec);
  51 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  52 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  53 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
  54
  55 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  56 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  57 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  58 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  59
  60 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  61
  62 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  63 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  64 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  65 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  66 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  67 static void spdc_reset_colors(SPPenContext *pc);
  68
  69 static void pen_disable_events(SPPenContext *const pc);
  70 static void pen_enable_events(SPPenContext *const pc);
  71
  72 static NR::Point pen_drag_origin_w(0, 0);
  73 static bool pen_within_tolerance = false;
  74
  75 static SPDrawContextClass *pen_parent_class;
  76
  77 /**
  78  * Register SPPenContext with Gdk and return its type.
  79  */
  80 GType
  81 sp_pen_context_get_type(void)
  82 {
  83     static GType type = 0;
  84     if (!type) {
  85         GTypeInfo info = {
  86             sizeof(SPPenContextClass),
  87             NULL, NULL,
  88             (GClassInitFunc) sp_pen_context_class_init,
  89             NULL, NULL,
  90             sizeof(SPPenContext),
  91             4,
  92             (GInstanceInitFunc) sp_pen_context_init,
  93             NULL,   /* value_table */
  94         };
  95         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  96     }
  97     return type;
  98 }
  99
 100 /**
 101  * Initialize the SPPenContext vtable.
 102  */
 103 static void
 104 sp_pen_context_class_init(SPPenContextClass *klass)
 105 {
 106     GObjectClass *object_class;
 107     SPEventContextClass *event_context_class;
 108
 109     object_class = (GObjectClass *) klass;
 110     event_context_class = (SPEventContextClass *) klass;
 111
 112     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 113
 114     object_class->dispose = sp_pen_context_dispose;
 115
 116     event_context_class->setup = sp_pen_context_setup;
 117     event_context_class->finish = sp_pen_context_finish;
 118     event_context_class->set = sp_pen_context_set;
 119     event_context_class->root_handler = sp_pen_context_root_handler;
 120     event_context_class->item_handler = sp_pen_context_item_handler;
 121 }
 122
 123 /**
 124  * Callback to initialize SPPenContext object.
 125  */
 126 static void
 127 sp_pen_context_init(SPPenContext *pc)
 128 {
 129
 130     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 131
 132     event_context->cursor_shape = cursor_pen_xpm;
 133     event_context->hot_x = 4;
 134     event_context->hot_y = 4;
 135
 136     pc->npoints = 0;
 137     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 138     pc->state = SP_PEN_CONTEXT_POINT;
 139
 140     pc->c0 = NULL;
 141     pc->c1 = NULL;
 142     pc->cl0 = NULL;
 143     pc->cl1 = NULL;
 144
 145     pc->events_disabled = 0;
 146
 147     pc->polylines_only = prefs_get_int_attribute("tools.freehand.pen", "freehand-mode", 0);
 148     pc->waiting_LPE = NULL;
 149 }
 150
 151 /**
 152  * Callback to destroy the SPPenContext object's members and itself.
 153  */
 154 static void
 155 sp_pen_context_dispose(GObject *object)
 156 {
 157     SPPenContext *pc;
 158
 159     pc = SP_PEN_CONTEXT(object);
 160
 161     if (pc->c0) {
 162         gtk_object_destroy(GTK_OBJECT(pc->c0));
 163         pc->c0 = NULL;
 164     }
 165     if (pc->c1) {
 166         gtk_object_destroy(GTK_OBJECT(pc->c1));
 167         pc->c1 = NULL;
 168     }
 169     if (pc->cl0) {
 170         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 171         pc->cl0 = NULL;
 172     }
 173     if (pc->cl1) {
 174         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 175         pc->cl1 = NULL;
 176     }
 177
 178     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 179
 180     if (pc->expecting_clicks_for_LPE > 0) {
 181         // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
 182         sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
 183     }
 184 }
 185
 186 /**
 187  * Callback to initialize SPPenContext object.
 188  */
 189 static void
 190 sp_pen_context_setup(SPEventContext *ec)
 191 {
 192     SPPenContext *pc;
 193
 194     pc = SP_PEN_CONTEXT(ec);
 195
 196     if (((SPEventContextClass *) pen_parent_class)->setup) {
 197         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 198     }
 199
 200     /* Pen indicators */
 201     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 202                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 203     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 204                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 205     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 206     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 207     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 208     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 209
 210     sp_canvas_item_hide(pc->c0);
 211     sp_canvas_item_hide(pc->c1);
 212     sp_canvas_item_hide(pc->cl0);
 213     sp_canvas_item_hide(pc->cl1);
 214
 215     sp_event_context_read(ec, "mode");
 216
 217     pc->anchor_statusbar = false;
 218
 219     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 220         ec->enableSelectionCue();
 221     }
 222 }
 223
 224 static void
 225 pen_cancel (SPPenContext *const pc)
 226 {
 227     pc->state = SP_PEN_CONTEXT_STOP;
 228     spdc_reset_colors(pc);
 229     sp_canvas_item_hide(pc->c0);
 230     sp_canvas_item_hide(pc->c1);
 231     sp_canvas_item_hide(pc->cl0);
 232     sp_canvas_item_hide(pc->cl1);
 233     pc->_message_context->clear();
 234     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 235
 236     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
 237 }
 238
 239 /**
 240  * Finalization callback.
 241  */
 242 static void
 243 sp_pen_context_finish(SPEventContext *ec)
 244 {
 245     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 246
 247     if (pc->npoints != 0) {
 248         pen_cancel (pc);
 249     }
 250
 251     if (((SPEventContextClass *) pen_parent_class)->finish) {
 252         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 253     }
 254 }
 255
 256 /**
 257  * Callback that sets key to value in pen context.
 258  */
 259 static void
 260 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 261 {
 262     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 263
 264     if (!strcmp(key, "mode")) {
 265         if ( val && !strcmp(val, "drag") ) {
 266             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 267         } else {
 268             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 269         }
 270     }
 271 }
 272
 273 /**
 274  * Snaps new node relative to the previous node.
 275  */
 276 static void
 277 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 278 {
 279     if (pc->npoints > 0) {
 280         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 281     }
 282
 283     spdc_endpoint_snap_free(pc, p, state);
 284 }
 285
 286 /**
 287  * Snaps new node's handle relative to the new node.
 288  */
 289 static void
 290 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 291 {
 292     g_return_if_fail(( pc->npoints == 2 ||
 293                        pc->npoints == 5   ));
 294
 295     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 296     spdc_endpoint_snap_free(pc, p, state);
 297 }
 298
 299 static gint
 300 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
 301 {
 302     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 303
 304     gint ret = FALSE;
 305
 306     switch (event->type) {
 307         case GDK_BUTTON_PRESS:
 308             ret = pen_handle_button_press(pc, event->button);
 309             break;
 310         case GDK_BUTTON_RELEASE:
 311             ret = pen_handle_button_release(pc, event->button);
 312             break;
 313         default:
 314             break;
 315     }
 316
 317     if (!ret) {
 318         if (((SPEventContextClass *) pen_parent_class)->item_handler)
 319             ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
 320     }
 321
 322     return ret;
 323 }
 324
 325 /**
 326  * Callback to handle all pen events.
 327  */
 328 static gint
 329 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 330 {
 331     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 332
 333     gint ret = FALSE;
 334
 335     switch (event->type) {
 336         case GDK_BUTTON_PRESS:
 337             ret = pen_handle_button_press(pc, event->button);
 338             break;
 339
 340         case GDK_MOTION_NOTIFY:
 341             ret = pen_handle_motion_notify(pc, event->motion);
 342             break;
 343
 344         case GDK_BUTTON_RELEASE:
 345             ret = pen_handle_button_release(pc, event->button);
 346             break;
 347
 348         case GDK_2BUTTON_PRESS:
 349             ret = pen_handle_2button_press(pc, event->button);
 350             break;
 351
 352         case GDK_KEY_PRESS:
 353             ret = pen_handle_key_press(pc, event);
 354             break;
 355
 356         default:
 357             break;
 358     }
 359
 360     if (!ret) {
 361         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 362             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 363         if (parent_root_handler) {
 364             ret = parent_root_handler(ec, event);
 365         }
 366     }
 367
 368     return ret;
 369 }
 370
 371 /**
 372  * Handle mouse button press event.
 373  */
 374 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 375 {
 376     if (pc->events_disabled) {
 377         // skip event processing if events are disabled
 378         return FALSE;
 379     }
 380
 381     SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 382     SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 383     NR::Point const event_w(bevent.x, bevent.y);
 384     NR::Point const event_dt(desktop->w2d(event_w));
 385     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 386
 387     gint ret = FALSE;
 388     if (bevent.button == 1 && !event_context->space_panning
 389         // when the last click for a waiting LPE occurs we want to finish the path
 390         && pc->expecting_clicks_for_LPE != 1) {
 391
 392         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 393             return TRUE;
 394         }
 395
 396         if (!pc->grab ) {
 397             /* Grab mouse, so release will not pass unnoticed */
 398             pc->grab = SP_CANVAS_ITEM(desktop->acetate);
 399             sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 400                                             GDK_BUTTON_RELEASE_MASK |
 401                                             GDK_POINTER_MOTION_MASK  ),
 402                                 NULL, bevent.time);
 403         }
 404
 405         pen_drag_origin_w = event_w;
 406         pen_within_tolerance = true;
 407
 408         /* Test whether we hit any anchor. */
 409         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 410
 411         switch (pc->mode) {
 412             case SP_PEN_CONTEXT_MODE_CLICK:
 413                 /* In click mode we add point on release */
 414                 switch (pc->state) {
 415                     case SP_PEN_CONTEXT_POINT:
 416                     case SP_PEN_CONTEXT_CONTROL:
 417                     case SP_PEN_CONTEXT_CLOSE:
 418                         break;
 419                     case SP_PEN_CONTEXT_STOP:
 420                         /* This is allowed, if we just cancelled curve */
 421                         pc->state = SP_PEN_CONTEXT_POINT;
 422                         break;
 423                     default:
 424                         break;
 425                 }
 426                 break;
 427             case SP_PEN_CONTEXT_MODE_DRAG:
 428                 switch (pc->state) {
 429                     case SP_PEN_CONTEXT_STOP:
 430                         /* This is allowed, if we just cancelled curve */
 431                     case SP_PEN_CONTEXT_POINT:
 432                         if (pc->npoints == 0) {
 433
 434                             if (bevent.state & GDK_CONTROL_MASK) {
 435                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 436                                 ret = TRUE;
 437                                 break;
 438                             }
 439
 440                             // TODO: Perhaps it would be nicer to rearrange the following case
 441                             // distinction so that the case of a waiting LPE is treated separately
 442
 443                             /* Set start anchor */
 444                             pc->sa = anchor;
 445                             NR::Point p;
 446                             if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
 447                                 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
 448                                    a fresh path to be created so don't continue an existing one */
 449                                 p = anchor->dp;
 450                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 451                             } else {
 452                                 // This is the first click of a new curve; deselect item so that
 453                                 // this curve is not combined with it (unless it is drawn from its
 454                                 // anchor, which is handled by the sibling branch above)
 455                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 456                                 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
 457                                     /* if we have a waiting LPE, we need a fresh path to be created
 458                                        so don't append to an existing one */
 459                                     selection->clear();
 460                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 461                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 462                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 463                                 }
 464
 465                                 /* Create green anchor */
 466                                 p = event_dt;
 467                                 spdc_endpoint_snap(pc, p, bevent.state);
 468                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 469                             }
 470                             spdc_pen_set_initial_point(pc, p);
 471                         } else {
 472
 473                             /* Set end anchor */
 474                             pc->ea = anchor;
 475                             NR::Point p;
 476                             if (anchor) {
 477                                 p = anchor->dp;
 478                                 // we hit an anchor, will finish the curve (either with or without closing)
 479                                 // in release handler
 480                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 481
 482                                 if (pc->green_anchor && pc->green_anchor->active) {
 483                                     // we clicked on the current curve start, so close it even if
 484                                     // we drag a handle away from it
 485                                     dc->green_closed = TRUE;
 486                                 }
 487                                 ret = TRUE;
 488                                 break;
 489
 490                             } else {
 491                                 p = event_dt;
 492                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 493                                 spdc_pen_set_subsequent_point(pc, p, true);
 494                                 if (pc->polylines_only) {
 495                                     spdc_pen_finish_segment(pc, p, bevent.state);
 496                                 }
 497                             }
 498                         }
 499
 500                         pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
 501                         ret = TRUE;
 502                         break;
 503                     case SP_PEN_CONTEXT_CONTROL:
 504                         g_warning("Button down in CONTROL state");
 505                         break;
 506                     case SP_PEN_CONTEXT_CLOSE:
 507                         g_warning("Button down in CLOSE state");
 508                         break;
 509                     default:
 510                         break;
 511                 }
 512                 break;
 513             default:
 514                 break;
 515         }
 516     } 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
 517         if (pc->npoints != 0) {
 518
 519             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 520             if (pc->green_closed) {
 521                 // finishing at the start anchor, close curve
 522                 spdc_pen_finish(pc, TRUE);
 523             } else {
 524                 // finishing at some other anchor, finish curve but not close
 525                 spdc_pen_finish(pc, FALSE);
 526             }
 527
 528             ret = TRUE;
 529         }
 530     }
 531
 532     if (pc->expecting_clicks_for_LPE) {
 533         --pc->expecting_clicks_for_LPE;
 534     }
 535
 536     return ret;
 537 }
 538
 539 /**
 540  * Handle motion_notify event.
 541  */
 542 static gint
 543 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 544 {
 545     gint ret = FALSE;
 546
 547     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 548     SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
 549
 550     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 551         // allow scrolling
 552         return FALSE;
 553     }
 554
 555     if (pc->events_disabled) {
 556         // skip motion events if pen events are disabled
 557         return FALSE;
 558     }
 559
 560     NR::Point const event_w(mevent.x,
 561                             mevent.y);
 562     if (pen_within_tolerance) {
 563         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 564                                                                "value", 0, 0, 100);
 565         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 566             return FALSE;   // Do not drag if we're within tolerance from origin.
 567         }
 568     }
 569     // Once the user has moved farther than tolerance from the original location
 570     // (indicating they intend to move the object, not click), then always process the
 571     // motion notify coordinates as given (no snapping back to origin)
 572     pen_within_tolerance = false;
 573
 574     /* Find desktop coordinates */
 575     NR::Point p = dt->w2d(event_w);
 576
 577     /* Test, whether we hit any anchor */
 578     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 579
 580     switch (pc->mode) {
 581         case SP_PEN_CONTEXT_MODE_CLICK:
 582             switch (pc->state) {
 583                 case SP_PEN_CONTEXT_POINT:
 584                     if ( pc->npoints != 0 ) {
 585                         /* Only set point, if we are already appending */
 586                         spdc_endpoint_snap(pc, p, mevent.state);
 587                         spdc_pen_set_subsequent_point(pc, p, true);
 588                         ret = TRUE;
 589                     }
 590                     break;
 591                 case SP_PEN_CONTEXT_CONTROL:
 592                 case SP_PEN_CONTEXT_CLOSE:
 593                     /* Placing controls is last operation in CLOSE state */
 594                     spdc_endpoint_snap(pc, p, mevent.state);
 595                     spdc_pen_set_ctrl(pc, p, mevent.state);
 596                     ret = TRUE;
 597                     break;
 598                 case SP_PEN_CONTEXT_STOP:
 599                     /* This is perfectly valid */
 600                     break;
 601                 default:
 602                     break;
 603             }
 604             break;
 605         case SP_PEN_CONTEXT_MODE_DRAG:
 606             switch (pc->state) {
 607                 case SP_PEN_CONTEXT_POINT:
 608                     if ( pc->npoints > 0 ) {
 609                         /* Only set point, if we are already appending */
 610
 611                         if (!anchor) {   /* Snap node only if not hitting anchor */
 612                             spdc_endpoint_snap(pc, p, mevent.state);
 613                         }
 614
 615                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 616
 617                         if (anchor && !pc->anchor_statusbar) {
 618                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 619                             pc->anchor_statusbar = true;
 620                         } else if (!anchor && pc->anchor_statusbar) {
 621                             pc->_message_context->clear();
 622                             pc->anchor_statusbar = false;
 623                         }
 624
 625                         ret = TRUE;
 626                     } else {
 627                         if (anchor && !pc->anchor_statusbar) {
 628                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 629                             pc->anchor_statusbar = true;
 630                         } else if (!anchor && pc->anchor_statusbar) {
 631                             pc->_message_context->clear();
 632                             pc->anchor_statusbar = false;
 633                         }
 634                     }
 635                     break;
 636                 case SP_PEN_CONTEXT_CONTROL:
 637                 case SP_PEN_CONTEXT_CLOSE:
 638                     /* Placing controls is last operation in CLOSE state */
 639
 640                     // snap the handle
 641                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 642
 643                     if (!pc->polylines_only) {
 644                         spdc_pen_set_ctrl(pc, p, mevent.state);
 645                     } else {
 646                         spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
 647                     }
 648                     gobble_motion_events(GDK_BUTTON1_MASK);
 649                     ret = TRUE;
 650                     break;
 651                 case SP_PEN_CONTEXT_STOP:
 652                     /* This is perfectly valid */
 653                     break;
 654                 default:
 655                     break;
 656             }
 657             break;
 658         default:
 659             break;
 660     }
 661     return ret;
 662 }
 663
 664 /**
 665  * Handle mouse button release event.
 666  */
 667 static gint
 668 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 669 {
 670     if (pc->events_disabled) {
 671         // skip event processing if events are disabled
 672         return FALSE;
 673     }
 674
 675     gint ret = FALSE;
 676     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 677     if ( revent.button == 1  && !event_context->space_panning) {
 678
 679         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 680
 681         NR::Point const event_w(revent.x,
 682                                 revent.y);
 683         /* Find desktop coordinates */
 684         NR::Point p = pc->desktop->w2d(event_w);
 685
 686         /* Test whether we hit any anchor. */
 687         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 688
 689         switch (pc->mode) {
 690             case SP_PEN_CONTEXT_MODE_CLICK:
 691                 switch (pc->state) {
 692                     case SP_PEN_CONTEXT_POINT:
 693                         if ( pc->npoints == 0 ) {
 694                             /* Start new thread only with button release */
 695                             if (anchor) {
 696                                 p = anchor->dp;
 697                             }
 698                             pc->sa = anchor;
 699                             spdc_pen_set_initial_point(pc, p);
 700                         } else {
 701                             /* Set end anchor here */
 702                             pc->ea = anchor;
 703                             if (anchor) {
 704                                 p = anchor->dp;
 705                             }
 706                         }
 707                         pc->state = SP_PEN_CONTEXT_CONTROL;
 708                         ret = TRUE;
 709                         break;
 710                     case SP_PEN_CONTEXT_CONTROL:
 711                         /* End current segment */
 712                         spdc_endpoint_snap(pc, p, revent.state);
 713                         spdc_pen_finish_segment(pc, p, revent.state);
 714                         pc->state = SP_PEN_CONTEXT_POINT;
 715                         ret = TRUE;
 716                         break;
 717                     case SP_PEN_CONTEXT_CLOSE:
 718                         /* End current segment */
 719                         if (!anchor) {   /* Snap node only if not hitting anchor */
 720                             spdc_endpoint_snap(pc, p, revent.state);
 721                         }
 722                         spdc_pen_finish_segment(pc, p, revent.state);
 723                         spdc_pen_finish(pc, TRUE);
 724                         pc->state = SP_PEN_CONTEXT_POINT;
 725                         ret = TRUE;
 726                         break;
 727                     case SP_PEN_CONTEXT_STOP:
 728                         /* This is allowed, if we just cancelled curve */
 729                         pc->state = SP_PEN_CONTEXT_POINT;
 730                         ret = TRUE;
 731                         break;
 732                     default:
 733                         break;
 734                 }
 735                 break;
 736             case SP_PEN_CONTEXT_MODE_DRAG:
 737                 switch (pc->state) {
 738                     case SP_PEN_CONTEXT_POINT:
 739                     case SP_PEN_CONTEXT_CONTROL:
 740                         if (!pc->polylines_only) {
 741                             spdc_endpoint_snap(pc, p, revent.state);
 742                             spdc_pen_finish_segment(pc, p, revent.state);
 743                         }
 744                         break;
 745                     case SP_PEN_CONTEXT_CLOSE:
 746                         spdc_endpoint_snap(pc, p, revent.state);
 747                         spdc_pen_finish_segment(pc, p, revent.state);
 748                         if (pc->green_closed) {
 749                             // finishing at the start anchor, close curve
 750                             spdc_pen_finish(pc, TRUE);
 751                         } else {
 752                             // finishing at some other anchor, finish curve but not close
 753                             spdc_pen_finish(pc, FALSE);
 754                         }
 755                         break;
 756                     case SP_PEN_CONTEXT_STOP:
 757                         /* This is allowed, if we just cancelled curve */
 758                         break;
 759                     default:
 760                         break;
 761                 }
 762                 pc->state = SP_PEN_CONTEXT_POINT;
 763                 ret = TRUE;
 764                 break;
 765             default:
 766                 break;
 767         }
 768
 769         if (pc->grab) {
 770             /* Release grab now */
 771             sp_canvas_item_ungrab(pc->grab, revent.time);
 772             pc->grab = NULL;
 773         }
 774
 775         ret = TRUE;
 776
 777         dc->green_closed = FALSE;
 778     }
 779
 780     // TODO: can we be sure that the path was created correctly?
 781     // TODO: should we offer an option to collect the clicks in a list?
 782     if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
 783         pc->polylines_only = prefs_get_int_attribute("tools.freehand.pen", "freehand-mode", 0);
 784
 785         SPEventContext *ec = SP_EVENT_CONTEXT(pc);
 786         Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
 787
 788         if (pc->waiting_LPE) {
 789             // we have an already created LPE waiting for a path
 790             pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
 791             selection->add(SP_OBJECT(pc->waiting_item));
 792             pc->waiting_LPE = NULL;
 793             pc->polylines_only = prefs_get_int_attribute("tools.freehand.pen", "freehand-mode", 0);
 794         } else {
 795             // the case that we need to create a new LPE and apply it to the just-drawn path is
 796             // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
 797         }
 798     }
 799
 800     return ret;
 801 }
 802
 803 static gint
 804 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 805 {
 806     gint ret = FALSE;
 807     if (pc->npoints != 0 && bevent.button != 2) {
 808         spdc_pen_finish(pc, FALSE);
 809         ret = TRUE;
 810     }
 811     return ret;
 812 }
 813
 814 void
 815 pen_redraw_all (SPPenContext *const pc)
 816 {
 817     // green
 818     if (pc->green_bpaths) {
 819         // remove old piecewise green canvasitems
 820         while (pc->green_bpaths) {
 821             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 822             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 823         }
 824         // one canvas bpath for all of green_curve
 825         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 826         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 827         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 828
 829         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 830     }
 831
 832     if (pc->green_anchor)
 833         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 834
 835     pc->red_curve->reset();
 836     pc->red_curve->moveto(pc->p[0]);
 837     pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
 838     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 839
 840     // handles
 841     if (pc->p[0] != pc->p[1]) {
 842         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 843         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 844         sp_canvas_item_show (pc->c1);
 845         sp_canvas_item_show (pc->cl1);
 846     } else {
 847         sp_canvas_item_hide (pc->c1);
 848         sp_canvas_item_hide (pc->cl1);
 849     }
 850
 851     Geom::Curve const * last_seg = pc->green_curve->last_segment();
 852     if (last_seg) {
 853         Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
 854         if ( cubic &&
 855              (*cubic)[2] != to_2geom(pc->p[0]) )
 856         {
 857             NR::Point p2 = from_2geom((*cubic)[2]);
 858             SP_CTRL(pc->c0)->moveto(p2);
 859             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
 860             sp_canvas_item_show (pc->c0);
 861             sp_canvas_item_show (pc->cl0);
 862         } else {
 863             sp_canvas_item_hide (pc->c0);
 864             sp_canvas_item_hide (pc->cl0);
 865         }
 866     }
 867 }
 868
 869 void
 870 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 871 {
 872     if (pc->npoints != 5)
 873         return;
 874
 875     // green
 876     if (!pc->green_curve->is_empty()) {
 877         pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
 878     } else {
 879         // start anchor too
 880         if (pc->green_anchor) {
 881             pc->green_anchor->dp += NR::Point(x, y);
 882         }
 883     }
 884
 885     // red
 886     pc->p[0] += NR::Point(x, y);
 887     pc->p[1] += NR::Point(x, y);
 888     pen_redraw_all(pc);
 889 }
 890
 891 void
 892 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 893 {
 894     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 895 }
 896
 897 void
 898 pen_lastpoint_tocurve (SPPenContext *const pc)
 899 {
 900     if (pc->npoints != 5)
 901         return;
 902
 903     Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
 904     if ( cubic ) {
 905         pc->p[1] = pc->p[0] + from_2geom( (*cubic)[3] - (*cubic)[2] );
 906     } else {
 907         pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
 908     }
 909
 910     pen_redraw_all(pc);
 911 }
 912
 913 void
 914 pen_lastpoint_toline (SPPenContext *const pc)
 915 {
 916     if (pc->npoints != 5)
 917         return;
 918
 919     pc->p[1] = pc->p[0];
 920
 921     pen_redraw_all(pc);
 922 }
 923
 924
 925 static gint
 926 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 927 {
 928     gint ret = FALSE;
 929     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 930
 931     switch (get_group0_keyval (&event->key)) {
 932
 933         case GDK_Left: // move last point left
 934         case GDK_KP_Left:
 935         case GDK_KP_4:
 936             if (!MOD__CTRL) { // not ctrl
 937                 if (MOD__ALT) { // alt
 938                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 939                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 940                 }
 941                 else { // no alt
 942                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 943                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 944                 }
 945                 ret = TRUE;
 946             }
 947             break;
 948         case GDK_Up: // move last point up
 949         case GDK_KP_Up:
 950         case GDK_KP_8:
 951             if (!MOD__CTRL) { // not ctrl
 952                 if (MOD__ALT) { // alt
 953                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 954                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 955                 }
 956                 else { // no alt
 957                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 958                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 959                 }
 960                 ret = TRUE;
 961             }
 962             break;
 963         case GDK_Right: // move last point right
 964         case GDK_KP_Right:
 965         case GDK_KP_6:
 966             if (!MOD__CTRL) { // not ctrl
 967                 if (MOD__ALT) { // alt
 968                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 969                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 970                 }
 971                 else { // no alt
 972                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 973                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 974                 }
 975                 ret = TRUE;
 976             }
 977             break;
 978         case GDK_Down: // move last point down
 979         case GDK_KP_Down:
 980         case GDK_KP_2:
 981             if (!MOD__CTRL) { // not ctrl
 982                 if (MOD__ALT) { // alt
 983                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 984                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 985                 }
 986                 else { // no alt
 987                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 988                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 989                 }
 990                 ret = TRUE;
 991             }
 992             break;
 993
 994         case GDK_P:
 995         case GDK_p:
 996             if (MOD__SHIFT_ONLY) {
 997                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
 998                 ret = TRUE;
 999             }
1000             break;
1001
1002         case GDK_C:
1003         case GDK_c:
1004             if (MOD__SHIFT_ONLY) {
1005                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1006                 ret = TRUE;
1007             }
1008             break;
1009
1010         case GDK_B:
1011         case GDK_b:
1012             if (MOD__SHIFT_ONLY) {
1013                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1014                 ret = TRUE;
1015             }
1016             break;
1017
1018         case GDK_A:
1019         case GDK_a:
1020             if (MOD__SHIFT_ONLY) {
1021                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1022                 ret = TRUE;
1023             }
1024             break;
1025
1026         case GDK_U:
1027         case GDK_u:
1028             if (MOD__SHIFT_ONLY) {
1029                 pen_lastpoint_tocurve(pc);
1030                 ret = TRUE;
1031             }
1032             break;
1033         case GDK_L:
1034         case GDK_l:
1035             if (MOD__SHIFT_ONLY) {
1036                 pen_lastpoint_toline(pc);
1037                 ret = TRUE;
1038             }
1039             break;
1040
1041         case GDK_Return:
1042         case GDK_KP_Enter:
1043             if (pc->npoints != 0) {
1044                 spdc_pen_finish(pc, FALSE);
1045                 ret = TRUE;
1046             }
1047             break;
1048         case GDK_Escape:
1049             if (pc->npoints != 0) {
1050                 // if drawing, cancel, otherwise pass it up for deselecting
1051                 pen_cancel (pc);
1052                 ret = TRUE;
1053             }
1054             break;
1055         case GDK_z:
1056         case GDK_Z:
1057             if (MOD__CTRL_ONLY && pc->npoints != 0) {
1058                 // if drawing, cancel, otherwise pass it up for undo
1059                 pen_cancel (pc);
1060                 ret = TRUE;
1061             }
1062             break;
1063         case GDK_g:
1064         case GDK_G:
1065             if (MOD__SHIFT_ONLY) {
1066                 sp_selection_to_guides();
1067                 ret = true;
1068             }
1069             break;
1070         case GDK_BackSpace:
1071         case GDK_Delete:
1072         case GDK_KP_Delete:
1073             if (pc->green_curve->is_empty()) {
1074                 if (!pc->red_curve->is_empty()) {
1075                     pen_cancel (pc);
1076                     ret = TRUE;
1077                 } else {
1078                     // do nothing; this event should be handled upstream
1079                 }
1080             } else {
1081                 /* Reset red curve */
1082                 pc->red_curve->reset();
1083                 /* Destroy topmost green bpath */
1084                 if (pc->green_bpaths) {
1085                     if (pc->green_bpaths->data)
1086                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1087                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1088                 }
1089                 /* Get last segment */
1090                 if ( pc->green_curve->is_empty() ) {
1091                     g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1092                     break;
1093                 }
1094                 // The code below assumes that pc->green_curve has only ONE path !
1095                 Geom::Path const & path = pc->green_curve->get_pathvector().back();
1096                 Geom::Curve const * crv = &path.back_default();
1097                 pc->p[0] = crv->initialPoint();
1098                 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1099                     pc->p[1] = from_2geom( (*cubic)[1] );
1100                 } else {
1101                     pc->p[1] = pc->p[0];
1102                 }
1103                 NR::Point const pt(( pc->npoints < 4
1104                                      ? from_2geom(crv->finalPoint())
1105                                      : pc->p[3] ));
1106                 pc->npoints = 2;
1107                 pc->green_curve->backspace();
1108                 sp_canvas_item_hide(pc->c0);
1109                 sp_canvas_item_hide(pc->c1);
1110                 sp_canvas_item_hide(pc->cl0);
1111                 sp_canvas_item_hide(pc->cl1);
1112                 pc->state = SP_PEN_CONTEXT_POINT;
1113                 spdc_pen_set_subsequent_point(pc, pt, true);
1114                 ret = TRUE;
1115             }
1116             break;
1117         default:
1118             break;
1119     }
1120     return ret;
1121 }
1122
1123 static void
1124 spdc_reset_colors(SPPenContext *pc)
1125 {
1126     /* Red */
1127     pc->red_curve->reset();
1128     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1129     /* Blue */
1130     pc->blue_curve->reset();
1131     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1132     /* Green */
1133     while (pc->green_bpaths) {
1134         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1135         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1136     }
1137     pc->green_curve->reset();
1138     if (pc->green_anchor) {
1139         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1140     }
1141     pc->sa = NULL;
1142     pc->ea = NULL;
1143     pc->npoints = 0;
1144     pc->red_curve_is_valid = false;
1145 }
1146
1147
1148 static void
1149 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1150 {
1151     g_assert( pc->npoints == 0 );
1152
1153     pc->p[0] = p;
1154     pc->p[1] = p;
1155     pc->npoints = 2;
1156     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1157
1158     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1159 }
1160
1161 /**
1162  * Show the status message for the current line/curve segment.
1163  * This type of message always shows angle/distance as the last
1164  * two parameters ("angle %3.2f&#176;, distance %s").
1165  */
1166 static void
1167 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1168 {
1169     g_assert(pc != NULL);
1170     g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1171     g_assert(message != NULL);
1172
1173     SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1174     NR::Point rel = p - pc->p[pc_point_to_compare];
1175     GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1176     double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1177     if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1178         angle = angle_to_compass (angle);
1179
1180     pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1181     g_string_free(dist, FALSE);
1182 }
1183
1184 static void
1185 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1186 {
1187     g_assert( pc->npoints != 0 );
1188     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1189
1190     pc->p[2] = p;
1191     pc->p[3] = p;
1192     pc->p[4] = p;
1193     pc->npoints = 5;
1194     pc->red_curve->reset();
1195     pc->red_curve->moveto(pc->p[0]);
1196     bool is_curve;
1197     if (pc->p[1] != pc->p[0])
1198     {
1199         pc->red_curve->curveto(pc->p[1], p, p);
1200         is_curve = true;
1201     } else {
1202         pc->red_curve->lineto(p);
1203         is_curve = false;
1204     }
1205
1206     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1207
1208     if (statusbar) {
1209         gchar *message = is_curve ?
1210             _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1211             _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1212         spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1213     }
1214 }
1215
1216 static void
1217 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1218 {
1219     sp_canvas_item_show(pc->c1);
1220     sp_canvas_item_show(pc->cl1);
1221
1222     if ( pc->npoints == 2 ) {
1223         pc->p[1] = p;
1224         sp_canvas_item_hide(pc->c0);
1225         sp_canvas_item_hide(pc->cl0);
1226         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1227         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1228
1229         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"));
1230     } else if ( pc->npoints == 5 ) {
1231         pc->p[4] = p;
1232         sp_canvas_item_show(pc->c0);
1233         sp_canvas_item_show(pc->cl0);
1234         bool is_symm = false;
1235         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1236              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1237             NR::Point delta = p - pc->p[3];
1238             pc->p[2] = pc->p[3] - delta;
1239             is_symm = true;
1240             pc->red_curve->reset();
1241             pc->red_curve->moveto(pc->p[0]);
1242             pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1243             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1244         }
1245         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1246         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1247         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1248         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1249
1250         gchar *message = is_symm ?
1251             _("<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") :
1252             _("<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");
1253         spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1254     } else {
1255         g_warning("Something bad happened - npoints is %d", pc->npoints);
1256     }
1257 }
1258
1259 static void
1260 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1261 {
1262     if (!pc->red_curve->is_empty()) {
1263         pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1264         SPCurve *curve = pc->red_curve->copy();
1265         /// \todo fixme:
1266         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1267         curve->unref();
1268         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1269
1270         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1271
1272         pc->p[0] = pc->p[3];
1273         pc->p[1] = pc->p[4];
1274         pc->npoints = 2;
1275
1276         pc->red_curve->reset();
1277     }
1278 }
1279
1280 static void
1281 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1282 {
1283     if (pc->expecting_clicks_for_LPE > 1) {
1284         // don't let the path be finished before we have collected the required number of mouse clicks
1285         return;
1286     }
1287
1288     pen_disable_events(pc);
1289
1290     SPDesktop *const desktop = pc->desktop;
1291     pc->_message_context->clear();
1292     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1293
1294     pc->red_curve->reset();
1295     spdc_concat_colors_and_flush(pc, closed);
1296     pc->sa = NULL;
1297     pc->ea = NULL;
1298
1299     pc->npoints = 0;
1300     pc->state = SP_PEN_CONTEXT_POINT;
1301
1302     sp_canvas_item_hide(pc->c0);
1303     sp_canvas_item_hide(pc->c1);
1304     sp_canvas_item_hide(pc->cl0);
1305     sp_canvas_item_hide(pc->cl1);
1306
1307     if (pc->green_anchor) {
1308         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1309     }
1310
1311
1312     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1313
1314     pen_enable_events(pc);
1315 }
1316
1317 static void
1318 pen_disable_events(SPPenContext *const pc) {
1319   pc->events_disabled++;
1320 }
1321
1322 static void
1323 pen_enable_events(SPPenContext *const pc) {
1324   g_return_if_fail(pc->events_disabled != 0);
1325
1326   pc->events_disabled--;
1327 }
1328
1329 void
1330 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1331                                          unsigned int num_clicks, bool use_polylines)
1332 {
1333     g_print ("Now waiting for %s to be applied\n",
1334              Inkscape::LivePathEffect::LPETypeConverter.get_label(effect_type).c_str());
1335     pc->expecting_clicks_for_LPE = num_clicks;
1336     pc->polylines_only = use_polylines;
1337     pc->waiting_LPE_type = effect_type;
1338 }
1339
1340 /*
1341   Local Variables:
1342   mode:c++
1343   c-file-style:"stroustrup"
1344   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1345   indent-tabs-mode:nil
1346   fill-column:99
1347   End:
1348 */
1349 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :