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         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         pen_drag_origin_w = event_w;
 397         pen_within_tolerance = true;
 398
 399         /* Test whether we hit any anchor. */
 400         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 401
 402         switch (pc->mode) {
 403             case SP_PEN_CONTEXT_MODE_CLICK:
 404                 /* In click mode we add point on release */
 405                 switch (pc->state) {
 406                     case SP_PEN_CONTEXT_POINT:
 407                     case SP_PEN_CONTEXT_CONTROL:
 408                     case SP_PEN_CONTEXT_CLOSE:
 409                         break;
 410                     case SP_PEN_CONTEXT_STOP:
 411                         /* This is allowed, if we just cancelled curve */
 412                         pc->state = SP_PEN_CONTEXT_POINT;
 413                         break;
 414                     default:
 415                         break;
 416                 }
 417                 break;
 418             case SP_PEN_CONTEXT_MODE_DRAG:
 419                 switch (pc->state) {
 420                     case SP_PEN_CONTEXT_STOP:
 421                         /* This is allowed, if we just cancelled curve */
 422                     case SP_PEN_CONTEXT_POINT:
 423                         if (pc->npoints == 0) {
 424
 425                             if (bevent.state & GDK_CONTROL_MASK) {
 426                                 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
 427                                 ret = TRUE;
 428                                 break;
 429                             }
 430
 431                             // TODO: Perhaps it would be nicer to rearrange the following case
 432                             // distinction so that the case of a waiting LPE is treated separately
 433
 434                             /* Set start anchor */
 435                             pc->sa = anchor;
 436                             NR::Point p;
 437                             if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
 438                                 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
 439                                    a fresh path to be created so don't continue an existing one */
 440                                 p = anchor->dp;
 441                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 442                             } else {
 443                                 // This is the first click of a new curve; deselect item so that
 444                                 // this curve is not combined with it (unless it is drawn from its
 445                                 // anchor, which is handled by the sibling branch above)
 446                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 447                                 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
 448                                     /* if we have a waiting LPE, we need a fresh path to be created
 449                                        so don't append to an existing one */
 450                                     selection->clear();
 451                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 452                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 453                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 454                                 }
 455
 456                                 /* Create green anchor */
 457                                 p = event_dt;
 458                                 spdc_endpoint_snap(pc, p, bevent.state);
 459                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 460                             }
 461                             spdc_pen_set_initial_point(pc, p);
 462                         } else {
 463
 464                             /* Set end anchor */
 465                             pc->ea = anchor;
 466                             NR::Point p;
 467                             if (anchor) {
 468
 469                                 p = anchor->dp;
 470                                 // we hit an anchor, will finish the curve (either with or without closing)
 471                                 // in release handler
 472                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 473
 474                                 if (pc->green_anchor && pc->green_anchor->active) {
 475                                     // we clicked on the current curve start, so close it even if
 476                                     // we drag a handle away from it
 477                                     dc->green_closed = TRUE;
 478                                 }
 479                                 ret = TRUE;
 480                                 break;
 481
 482                             } else {
 483
 484                                 p = event_dt;
 485                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 486                                 spdc_pen_set_subsequent_point(pc, p, true);
 487                                 if (pc->polylines_only) {
 488                                     spdc_pen_finish_segment(pc, p, bevent.state);
 489                                 }
 490                             }
 491
 492                         }
 493                         pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
 494                         ret = TRUE;
 495                         break;
 496                     case SP_PEN_CONTEXT_CONTROL:
 497                         g_warning("Button down in CONTROL state");
 498                         break;
 499                     case SP_PEN_CONTEXT_CLOSE:
 500                         g_warning("Button down in CLOSE state");
 501                         break;
 502                     default:
 503                         break;
 504                 }
 505                 break;
 506             default:
 507                 break;
 508         }
 509     } 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
 510         if (pc->npoints != 0) {
 511
 512             spdc_pen_finish_segment(pc, event_dt, bevent.state);
 513             if (pc->green_closed) {
 514                 // finishing at the start anchor, close curve
 515                 spdc_pen_finish(pc, TRUE);
 516             } else {
 517                 // finishing at some other anchor, finish curve but not close
 518                 spdc_pen_finish(pc, FALSE);
 519             }
 520
 521             ret = TRUE;
 522         }
 523     }
 524
 525     if (pc->expecting_clicks_for_LPE) {
 526         --pc->expecting_clicks_for_LPE;
 527     }
 528
 529     return ret;
 530 }
 531
 532 /**
 533  * Handle motion_notify event.
 534  */
 535 static gint
 536 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 537 {
 538     gint ret = FALSE;
 539
 540     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 541
 542     if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 543         // allow scrolling
 544         return FALSE;
 545     }
 546
 547     if (pc->events_disabled) {
 548         // skip motion events if pen events are disabled
 549         return FALSE;
 550     }
 551
 552     NR::Point const event_w(mevent.x,
 553                             mevent.y);
 554     if (pen_within_tolerance) {
 555         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 556                                                                "value", 0, 0, 100);
 557         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 558             return FALSE;   // Do not drag if we're within tolerance from origin.
 559         }
 560     }
 561     // Once the user has moved farther than tolerance from the original location
 562     // (indicating they intend to move the object, not click), then always process the
 563     // motion notify coordinates as given (no snapping back to origin)
 564     pen_within_tolerance = false;
 565
 566     SPDesktop *const dt = pc->desktop;
 567     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 568         /* Grab mouse, so release will not pass unnoticed */
 569         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 570         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 571                                         GDK_BUTTON_RELEASE_MASK |
 572                                         GDK_POINTER_MOTION_MASK  ),
 573                             NULL, mevent.time);
 574     }
 575
 576     /* Find desktop coordinates */
 577     NR::Point p = dt->w2d(event_w);
 578
 579     /* Test, whether we hit any anchor */
 580     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 581
 582     switch (pc->mode) {
 583         case SP_PEN_CONTEXT_MODE_CLICK:
 584             switch (pc->state) {
 585                 case SP_PEN_CONTEXT_POINT:
 586                     if ( pc->npoints != 0 ) {
 587                         /* Only set point, if we are already appending */
 588                         spdc_endpoint_snap(pc, p, mevent.state);
 589                         spdc_pen_set_subsequent_point(pc, p, true);
 590                         ret = TRUE;
 591                     }
 592                     break;
 593                 case SP_PEN_CONTEXT_CONTROL:
 594                 case SP_PEN_CONTEXT_CLOSE:
 595                     /* Placing controls is last operation in CLOSE state */
 596                     spdc_endpoint_snap(pc, p, mevent.state);
 597                     spdc_pen_set_ctrl(pc, p, mevent.state);
 598                     ret = TRUE;
 599                     break;
 600                 case SP_PEN_CONTEXT_STOP:
 601                     /* This is perfectly valid */
 602                     break;
 603                 default:
 604                     break;
 605             }
 606             break;
 607         case SP_PEN_CONTEXT_MODE_DRAG:
 608             switch (pc->state) {
 609                 case SP_PEN_CONTEXT_POINT:
 610                     if ( pc->npoints > 0 ) {
 611                         /* Only set point, if we are already appending */
 612
 613                         if (!anchor) {   /* Snap node only if not hitting anchor */
 614                             spdc_endpoint_snap(pc, p, mevent.state);
 615                         }
 616
 617                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 618
 619                         if (anchor && !pc->anchor_statusbar) {
 620                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 621                             pc->anchor_statusbar = true;
 622                         } else if (!anchor && pc->anchor_statusbar) {
 623                             pc->_message_context->clear();
 624                             pc->anchor_statusbar = false;
 625                         }
 626
 627                         ret = TRUE;
 628                     } else {
 629                         if (anchor && !pc->anchor_statusbar) {
 630                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 631                             pc->anchor_statusbar = true;
 632                         } else if (!anchor && pc->anchor_statusbar) {
 633                             pc->_message_context->clear();
 634                             pc->anchor_statusbar = false;
 635                         }
 636                     }
 637                     break;
 638                 case SP_PEN_CONTEXT_CONTROL:
 639                 case SP_PEN_CONTEXT_CLOSE:
 640                     /* Placing controls is last operation in CLOSE state */
 641
 642                     // snap the handle
 643                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 644
 645                     if (!pc->polylines_only) {
 646                         spdc_pen_set_ctrl(pc, p, mevent.state);
 647                     } else {
 648                         spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
 649                     }
 650                     gobble_motion_events(GDK_BUTTON1_MASK);
 651                     ret = TRUE;
 652                     break;
 653                 case SP_PEN_CONTEXT_STOP:
 654                     /* This is perfectly valid */
 655                     break;
 656                 default:
 657                     break;
 658             }
 659             break;
 660         default:
 661             break;
 662     }
 663     return ret;
 664 }
 665
 666 /**
 667  * Handle mouse button release event.
 668  */
 669 static gint
 670 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 671 {
 672     if (pc->events_disabled) {
 673         // skip event processing if events are disabled
 674         return FALSE;
 675     }
 676
 677     gint ret = FALSE;
 678     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 679     if ( revent.button == 1  && !event_context->space_panning) {
 680
 681         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 682
 683         NR::Point const event_w(revent.x,
 684                                 revent.y);
 685         /* Find desktop coordinates */
 686         NR::Point p = pc->desktop->w2d(event_w);
 687
 688         /* Test whether we hit any anchor. */
 689         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 690
 691         switch (pc->mode) {
 692             case SP_PEN_CONTEXT_MODE_CLICK:
 693                 switch (pc->state) {
 694                     case SP_PEN_CONTEXT_POINT:
 695                         if ( pc->npoints == 0 ) {
 696                             /* Start new thread only with button release */
 697                             if (anchor) {
 698                                 p = anchor->dp;
 699                             }
 700                             pc->sa = anchor;
 701                             spdc_pen_set_initial_point(pc, p);
 702                         } else {
 703                             /* Set end anchor here */
 704                             pc->ea = anchor;
 705                             if (anchor) {
 706                                 p = anchor->dp;
 707                             }
 708                         }
 709                         pc->state = SP_PEN_CONTEXT_CONTROL;
 710                         ret = TRUE;
 711                         break;
 712                     case SP_PEN_CONTEXT_CONTROL:
 713                         /* End current segment */
 714                         spdc_endpoint_snap(pc, p, revent.state);
 715                         spdc_pen_finish_segment(pc, p, revent.state);
 716                         pc->state = SP_PEN_CONTEXT_POINT;
 717                         ret = TRUE;
 718                         break;
 719                     case SP_PEN_CONTEXT_CLOSE:
 720                         /* End current segment */
 721                         if (!anchor) {   /* Snap node only if not hitting anchor */
 722                             spdc_endpoint_snap(pc, p, revent.state);
 723                         }
 724                         spdc_pen_finish_segment(pc, p, revent.state);
 725                         spdc_pen_finish(pc, TRUE);
 726                         pc->state = SP_PEN_CONTEXT_POINT;
 727                         ret = TRUE;
 728                         break;
 729                     case SP_PEN_CONTEXT_STOP:
 730                         /* This is allowed, if we just cancelled curve */
 731                         pc->state = SP_PEN_CONTEXT_POINT;
 732                         ret = TRUE;
 733                         break;
 734                     default:
 735                         break;
 736                 }
 737                 break;
 738             case SP_PEN_CONTEXT_MODE_DRAG:
 739                 switch (pc->state) {
 740                     case SP_PEN_CONTEXT_POINT:
 741                     case SP_PEN_CONTEXT_CONTROL:
 742                         if (!pc->polylines_only) {
 743                             spdc_endpoint_snap(pc, p, revent.state);
 744                             spdc_pen_finish_segment(pc, p, revent.state);
 745                         }
 746                         break;
 747                     case SP_PEN_CONTEXT_CLOSE:
 748                         spdc_endpoint_snap(pc, p, revent.state);
 749                         spdc_pen_finish_segment(pc, p, revent.state);
 750                         if (pc->green_closed) {
 751                             // finishing at the start anchor, close curve
 752                             spdc_pen_finish(pc, TRUE);
 753                         } else {
 754                             // finishing at some other anchor, finish curve but not close
 755                             spdc_pen_finish(pc, FALSE);
 756                         }
 757                         break;
 758                     case SP_PEN_CONTEXT_STOP:
 759                         /* This is allowed, if we just cancelled curve */
 760                         break;
 761                     default:
 762                         break;
 763                 }
 764                 pc->state = SP_PEN_CONTEXT_POINT;
 765                 ret = TRUE;
 766                 break;
 767             default:
 768                 break;
 769         }
 770
 771         if (pc->grab) {
 772             /* Release grab now */
 773             sp_canvas_item_ungrab(pc->grab, revent.time);
 774             pc->grab = NULL;
 775         }
 776
 777         ret = TRUE;
 778
 779         dc->green_closed = FALSE;
 780     }
 781
 782     // TODO: can we be sure that the path was created correctly?
 783     // TODO: should we offer an option to collect the clicks in a list?
 784     if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
 785         pc->polylines_only = false;
 786
 787         SPEventContext *ec = SP_EVENT_CONTEXT(pc);
 788         Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
 789
 790         if (pc->waiting_LPE) {
 791             // we have an already created LPE waiting for a path
 792             pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
 793             selection->add(SP_OBJECT(pc->waiting_item));
 794             pc->waiting_LPE = NULL;
 795             pc->polylines_only = false;
 796         } else {
 797             // the case that we need to create a new LPE and apply it to the just-drawn path is
 798             // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
 799         }
 800     }
 801
 802     return ret;
 803 }
 804
 805 static gint
 806 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 807 {
 808     gint ret = FALSE;
 809     if (pc->npoints != 0 && bevent.button != 2) {
 810         spdc_pen_finish(pc, FALSE);
 811         ret = TRUE;
 812     }
 813     return ret;
 814 }
 815
 816 void
 817 pen_redraw_all (SPPenContext *const pc)
 818 {
 819     // green
 820     if (pc->green_bpaths) {
 821         // remove old piecewise green canvasitems
 822         while (pc->green_bpaths) {
 823             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 824             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 825         }
 826         // one canvas bpath for all of green_curve
 827         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 828         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 829         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 830
 831         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 832     }
 833
 834     if (pc->green_anchor)
 835         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 836
 837     pc->red_curve->reset();
 838     pc->red_curve->moveto(pc->p[0]);
 839     pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
 840     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 841
 842     // handles
 843     if (pc->p[0] != pc->p[1]) {
 844         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 845         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 846         sp_canvas_item_show (pc->c1);
 847         sp_canvas_item_show (pc->cl1);
 848     } else {
 849         sp_canvas_item_hide (pc->c1);
 850         sp_canvas_item_hide (pc->cl1);
 851     }
 852
 853     NArtBpath const * bpath = pc->green_curve->last_bpath();
 854     if (bpath) {
 855         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 856             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 857             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 858             sp_canvas_item_show (pc->c0);
 859             sp_canvas_item_show (pc->cl0);
 860         } else {
 861             sp_canvas_item_hide (pc->c0);
 862             sp_canvas_item_hide (pc->cl0);
 863         }
 864     }
 865 }
 866
 867 void
 868 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 869 {
 870     if (pc->npoints != 5)
 871         return;
 872
 873     // green
 874     if (!pc->green_curve->is_empty()) {
 875         pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
 876     } else {
 877         // start anchor too
 878         if (pc->green_anchor) {
 879             pc->green_anchor->dp += NR::Point(x, y);
 880         }
 881     }
 882
 883     // red
 884     pc->p[0] += NR::Point(x, y);
 885     pc->p[1] += NR::Point(x, y);
 886     pen_redraw_all(pc);
 887 }
 888
 889 void
 890 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 891 {
 892     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 893 }
 894
 895 void
 896 pen_lastpoint_tocurve (SPPenContext *const pc)
 897 {
 898     if (pc->npoints != 5)
 899         return;
 900
 901     // red
 902     NArtBpath const * bpath = pc->green_curve->last_bpath();
 903     if (bpath && bpath->code == NR_CURVETO) {
 904         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 905     } else {
 906         pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
 907     }
 908
 909     pen_redraw_all(pc);
 910 }
 911
 912 void
 913 pen_lastpoint_toline (SPPenContext *const pc)
 914 {
 915     if (pc->npoints != 5)
 916         return;
 917
 918     pc->p[1] = pc->p[0];
 919
 920     pen_redraw_all(pc);
 921 }
 922
 923
 924 static gint
 925 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 926 {
 927     gint ret = FALSE;
 928     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 929
 930     switch (get_group0_keyval (&event->key)) {
 931
 932         case GDK_Left: // move last point left
 933         case GDK_KP_Left:
 934         case GDK_KP_4:
 935             if (!MOD__CTRL) { // not ctrl
 936                 if (MOD__ALT) { // alt
 937                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 938                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 939                 }
 940                 else { // no alt
 941                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 942                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 943                 }
 944                 ret = TRUE;
 945             }
 946             break;
 947         case GDK_Up: // move last point up
 948         case GDK_KP_Up:
 949         case GDK_KP_8:
 950             if (!MOD__CTRL) { // not ctrl
 951                 if (MOD__ALT) { // alt
 952                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 953                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 954                 }
 955                 else { // no alt
 956                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 957                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 958                 }
 959                 ret = TRUE;
 960             }
 961             break;
 962         case GDK_Right: // move last point right
 963         case GDK_KP_Right:
 964         case GDK_KP_6:
 965             if (!MOD__CTRL) { // not ctrl
 966                 if (MOD__ALT) { // alt
 967                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 968                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 969                 }
 970                 else { // no alt
 971                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 972                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 973                 }
 974                 ret = TRUE;
 975             }
 976             break;
 977         case GDK_Down: // move last point down
 978         case GDK_KP_Down:
 979         case GDK_KP_2:
 980             if (!MOD__CTRL) { // not ctrl
 981                 if (MOD__ALT) { // alt
 982                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 983                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 984                 }
 985                 else { // no alt
 986                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 987                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 988                 }
 989                 ret = TRUE;
 990             }
 991             break;
 992
 993         case GDK_P:
 994         case GDK_p:
 995             if (MOD__SHIFT_ONLY) {
 996                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
 997                 ret = TRUE;
 998             }
 999             break;
1000
1001         case GDK_C:
1002         case GDK_c:
1003             if (MOD__SHIFT_ONLY) {
1004                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1005                 ret = TRUE;
1006             }
1007             break;
1008
1009         case GDK_B:
1010         case GDK_b:
1011             if (MOD__SHIFT_ONLY) {
1012                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1013                 ret = TRUE;
1014             }
1015             break;
1016
1017         case GDK_A:
1018         case GDK_a:
1019             if (MOD__SHIFT_ONLY) {
1020                 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1021                 ret = TRUE;
1022             }
1023             break;
1024
1025         case GDK_U:
1026         case GDK_u:
1027             if (MOD__SHIFT_ONLY) {
1028                 pen_lastpoint_tocurve(pc);
1029                 ret = TRUE;
1030             }
1031             break;
1032         case GDK_L:
1033         case GDK_l:
1034             if (MOD__SHIFT_ONLY) {
1035                 pen_lastpoint_toline(pc);
1036                 ret = TRUE;
1037             }
1038             break;
1039
1040         case GDK_Return:
1041         case GDK_KP_Enter:
1042             if (pc->npoints != 0) {
1043                 spdc_pen_finish(pc, FALSE);
1044                 ret = TRUE;
1045             }
1046             break;
1047         case GDK_Escape:
1048             if (pc->npoints != 0) {
1049                 // if drawing, cancel, otherwise pass it up for deselecting
1050                 pen_cancel (pc);
1051                 ret = TRUE;
1052             }
1053             break;
1054         case GDK_z:
1055         case GDK_Z:
1056             if (MOD__CTRL_ONLY && pc->npoints != 0) {
1057                 // if drawing, cancel, otherwise pass it up for undo
1058                 pen_cancel (pc);
1059                 ret = TRUE;
1060             }
1061             break;
1062         case GDK_g:
1063         case GDK_G:
1064             if (MOD__SHIFT_ONLY) {
1065                 sp_selection_to_guides();
1066                 ret = true;
1067             }
1068             break;
1069         case GDK_BackSpace:
1070         case GDK_Delete:
1071         case GDK_KP_Delete:
1072             if (pc->green_curve->is_empty()) {
1073                 if (!pc->red_curve->is_empty()) {
1074                     pen_cancel (pc);
1075                     ret = TRUE;
1076                 } else {
1077                     // do nothing; this event should be handled upstream
1078                 }
1079             } else {
1080                 /* Reset red curve */
1081                 pc->red_curve->reset();
1082                 /* Destroy topmost green bpath */
1083                 if (pc->green_bpaths) {
1084                     if (pc->green_bpaths->data)
1085                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1086                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1087                 }
1088                 /* Get last segment */
1089                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1090                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1091                 if ( e < 2 ) {
1092                     g_warning("Green curve length is %d", e);
1093                     break;
1094                 }
1095                 pc->p[0] = p[e - 2].c(3);
1096                 if (p[e - 1].code == NR_CURVETO) {
1097                     pc->p[1] = p[e - 1].c(1);
1098                 } else {
1099                     pc->p[1] = pc->p[0];
1100                 }
1101                 NR::Point const pt(( pc->npoints < 4
1102                                      ? p[e - 1].c(3)
1103                                      : pc->p[3] ));
1104                 pc->npoints = 2;
1105                 pc->green_curve->backspace();
1106                 sp_canvas_item_hide(pc->c0);
1107                 sp_canvas_item_hide(pc->c1);
1108                 sp_canvas_item_hide(pc->cl0);
1109                 sp_canvas_item_hide(pc->cl1);
1110                 pc->state = SP_PEN_CONTEXT_POINT;
1111                 spdc_pen_set_subsequent_point(pc, pt, true);
1112                 ret = TRUE;
1113             }
1114             break;
1115         default:
1116             break;
1117     }
1118     return ret;
1119 }
1120
1121 static void
1122 spdc_reset_colors(SPPenContext *pc)
1123 {
1124     /* Red */
1125     pc->red_curve->reset();
1126     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1127     /* Blue */
1128     pc->blue_curve->reset();
1129     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1130     /* Green */
1131     while (pc->green_bpaths) {
1132         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1133         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1134     }
1135     pc->green_curve->reset();
1136     if (pc->green_anchor) {
1137         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1138     }
1139     pc->sa = NULL;
1140     pc->ea = NULL;
1141     pc->npoints = 0;
1142     pc->red_curve_is_valid = false;
1143 }
1144
1145
1146 static void
1147 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1148 {
1149     g_assert( pc->npoints == 0 );
1150
1151     pc->p[0] = p;
1152     pc->p[1] = p;
1153     pc->npoints = 2;
1154     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1155
1156     sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1157 }
1158
1159 /**
1160  * Show the status message for the current line/curve segment.
1161  * This type of message always shows angle/distance as the last
1162  * two parameters ("angle %3.2f&#176;, distance %s").
1163  */
1164 static void
1165 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1166 {
1167     g_assert(pc != NULL);
1168     g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1169     g_assert(message != NULL);
1170
1171     SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1172     NR::Point rel = p - pc->p[pc_point_to_compare];
1173     GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1174     double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1175     if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1176         angle = angle_to_compass (angle);
1177
1178     pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1179     g_string_free(dist, FALSE);
1180 }
1181
1182 static void
1183 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1184 {
1185     g_assert( pc->npoints != 0 );
1186     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1187
1188     pc->p[2] = p;
1189     pc->p[3] = p;
1190     pc->p[4] = p;
1191     pc->npoints = 5;
1192     pc->red_curve->reset();
1193     pc->red_curve->moveto(pc->p[0]);
1194     bool is_curve;
1195     if (pc->p[1] != pc->p[0])
1196     {
1197         pc->red_curve->curveto(pc->p[1], p, p);
1198         is_curve = true;
1199     } else {
1200         pc->red_curve->lineto(p);
1201         is_curve = false;
1202     }
1203
1204     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1205
1206     if (statusbar) {
1207         gchar *message = is_curve ?
1208             _("<b>Curve segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1209             _("<b>Line segment</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1210         spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1211     }
1212 }
1213
1214 static void
1215 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1216 {
1217     sp_canvas_item_show(pc->c1);
1218     sp_canvas_item_show(pc->cl1);
1219
1220     if ( pc->npoints == 2 ) {
1221         pc->p[1] = p;
1222         sp_canvas_item_hide(pc->c0);
1223         sp_canvas_item_hide(pc->cl0);
1224         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1225         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1226
1227         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"));
1228     } else if ( pc->npoints == 5 ) {
1229         pc->p[4] = p;
1230         sp_canvas_item_show(pc->c0);
1231         sp_canvas_item_show(pc->cl0);
1232         bool is_symm = false;
1233         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1234              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1235             NR::Point delta = p - pc->p[3];
1236             pc->p[2] = pc->p[3] - delta;
1237             is_symm = true;
1238             pc->red_curve->reset();
1239             pc->red_curve->moveto(pc->p[0]);
1240             pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1241             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1242         }
1243         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1244         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1245         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1246         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1247
1248         gchar *message = is_symm ?
1249             _("<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") :
1250             _("<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");
1251         spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1252     } else {
1253         g_warning("Something bad happened - npoints is %d", pc->npoints);
1254     }
1255 }
1256
1257 static void
1258 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1259 {
1260     if (!pc->red_curve->is_empty()) {
1261         pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1262         SPCurve *curve = pc->red_curve->copy();
1263         /// \todo fixme:
1264         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1265         curve->unref();
1266         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1267
1268         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1269
1270         pc->p[0] = pc->p[3];
1271         pc->p[1] = pc->p[4];
1272         pc->npoints = 2;
1273
1274         pc->red_curve->reset();
1275     }
1276 }
1277
1278 static void
1279 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1280 {
1281     if (pc->expecting_clicks_for_LPE > 1) {
1282         // don't let the path be finished before we have collected the required number of mouse clicks
1283         return;
1284     }
1285
1286     pen_disable_events(pc);
1287
1288     SPDesktop *const desktop = pc->desktop;
1289     pc->_message_context->clear();
1290     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1291
1292     pc->red_curve->reset();
1293     spdc_concat_colors_and_flush(pc, closed);
1294     pc->sa = NULL;
1295     pc->ea = NULL;
1296
1297     pc->npoints = 0;
1298     pc->state = SP_PEN_CONTEXT_POINT;
1299
1300     sp_canvas_item_hide(pc->c0);
1301     sp_canvas_item_hide(pc->c1);
1302     sp_canvas_item_hide(pc->cl0);
1303     sp_canvas_item_hide(pc->cl1);
1304
1305     if (pc->green_anchor) {
1306         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1307     }
1308
1309
1310     sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1311
1312     pen_enable_events(pc);
1313 }
1314
1315 static void
1316 pen_disable_events(SPPenContext *const pc) {
1317   pc->events_disabled++;
1318 }
1319
1320 static void
1321 pen_enable_events(SPPenContext *const pc) {
1322   g_return_if_fail(pc->events_disabled != 0);
1323
1324   pc->events_disabled--;
1325 }
1326
1327 void
1328 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1329                                          unsigned int num_clicks, bool use_polylines)
1330 {
1331     g_print ("Now waiting for %s to be applied\n",
1332              Inkscape::LivePathEffect::LPETypeConverter.get_label(effect_type).c_str());
1333     pc->expecting_clicks_for_LPE = num_clicks;
1334     pc->polylines_only = use_polylines;
1335     pc->waiting_LPE_type = effect_type;
1336 }
1337
1338 /*
1339   Local Variables:
1340   mode:c++
1341   c-file-style:"stroustrup"
1342   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1343   indent-tabs-mode:nil
1344   fill-column:99
1345   End:
1346 */
1347 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :