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
  20 #include "pen-context.h"
  21 #include "sp-namedview.h"
  22 #include "sp-metrics.h"
  23 #include "desktop.h"
  24 #include "desktop-handles.h"
  25 #include "selection.h"
  26 #include "draw-anchor.h"
  27 #include "message-stack.h"
  28 #include "message-context.h"
  29 #include "prefs-utils.h"
  30 #include "sp-path.h"
  31
  32 #include "pixmaps/cursor-pen.xpm"
  33 #include "display/canvas-bpath.h"
  34 #include "display/sp-ctrlline.h"
  35 #include "display/sodipodi-ctrl.h"
  36 #include <glibmm/i18n.h>
  37 #include "libnr/n-art-bpath.h"
  38 #include "helper/units.h"
  39 #include "macros.h"
  40 #include "context-fns.h"
  41
  42
  43 static void sp_pen_context_class_init(SPPenContextClass *klass);
  44 static void sp_pen_context_init(SPPenContext *pc);
  45 static void sp_pen_context_dispose(GObject *object);
  46
  47 static void sp_pen_context_setup(SPEventContext *ec);
  48 static void sp_pen_context_finish(SPEventContext *ec);
  49 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  50 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  51
  52 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  53 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  54 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  55 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  56
  57 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  58
  59 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  60 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  61 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  62 static gint pen_handle_2button_press(SPPenContext *const pc);
  63 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  64 static void spdc_reset_colors(SPPenContext *pc);
  65
  66
  67 static NR::Point pen_drag_origin_w(0, 0);
  68 static bool pen_within_tolerance = false;
  69
  70 static SPDrawContextClass *pen_parent_class;
  71
  72 /**
  73  * Register SPPenContext with Gdk and return its type.
  74  */
  75 GType
  76 sp_pen_context_get_type(void)
  77 {
  78     static GType type = 0;
  79     if (!type) {
  80         GTypeInfo info = {
  81             sizeof(SPPenContextClass),
  82             NULL, NULL,
  83             (GClassInitFunc) sp_pen_context_class_init,
  84             NULL, NULL,
  85             sizeof(SPPenContext),
  86             4,
  87             (GInstanceInitFunc) sp_pen_context_init,
  88             NULL,   /* value_table */
  89         };
  90         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  91     }
  92     return type;
  93 }
  94
  95 /**
  96  * Initialize the SPPenContext vtable.
  97  */
  98 static void
  99 sp_pen_context_class_init(SPPenContextClass *klass)
 100 {
 101     GObjectClass *object_class;
 102     SPEventContextClass *event_context_class;
 103
 104     object_class = (GObjectClass *) klass;
 105     event_context_class = (SPEventContextClass *) klass;
 106
 107     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 108
 109     object_class->dispose = sp_pen_context_dispose;
 110
 111     event_context_class->setup = sp_pen_context_setup;
 112     event_context_class->finish = sp_pen_context_finish;
 113     event_context_class->set = sp_pen_context_set;
 114     event_context_class->root_handler = sp_pen_context_root_handler;
 115 }
 116
 117 /**
 118  * Callback to initialize SPPenContext object.
 119  */
 120 static void
 121 sp_pen_context_init(SPPenContext *pc)
 122 {
 123
 124     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 125
 126     event_context->cursor_shape = cursor_pen_xpm;
 127     event_context->hot_x = 4;
 128     event_context->hot_y = 4;
 129
 130     pc->npoints = 0;
 131     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 132     pc->state = SP_PEN_CONTEXT_POINT;
 133
 134     pc->c0 = NULL;
 135     pc->c1 = NULL;
 136     pc->cl0 = NULL;
 137     pc->cl1 = NULL;
 138 }
 139
 140 /**
 141  * Callback to destroy the SPPenContext object's members and itself.
 142  */
 143 static void
 144 sp_pen_context_dispose(GObject *object)
 145 {
 146     SPPenContext *pc;
 147
 148     pc = SP_PEN_CONTEXT(object);
 149
 150     if (pc->c0) {
 151         gtk_object_destroy(GTK_OBJECT(pc->c0));
 152         pc->c0 = NULL;
 153     }
 154     if (pc->c1) {
 155         gtk_object_destroy(GTK_OBJECT(pc->c1));
 156         pc->c1 = NULL;
 157     }
 158     if (pc->cl0) {
 159         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 160         pc->cl0 = NULL;
 161     }
 162     if (pc->cl1) {
 163         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 164         pc->cl1 = NULL;
 165     }
 166
 167     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 168 }
 169
 170 /**
 171  * Callback to initialize SPPenContext object.
 172  */
 173 static void
 174 sp_pen_context_setup(SPEventContext *ec)
 175 {
 176     SPPenContext *pc;
 177
 178     pc = SP_PEN_CONTEXT(ec);
 179
 180     if (((SPEventContextClass *) pen_parent_class)->setup) {
 181         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 182     }
 183
 184     /* Pen indicators */
 185     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 186                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 187     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 188                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 189     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 190     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 191     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 192     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 193
 194     sp_canvas_item_hide(pc->c0);
 195     sp_canvas_item_hide(pc->c1);
 196     sp_canvas_item_hide(pc->cl0);
 197     sp_canvas_item_hide(pc->cl1);
 198
 199     sp_event_context_read(ec, "mode");
 200
 201     pc->anchor_statusbar = false;
 202
 203     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 204         ec->enableSelectionCue();
 205     }
 206 }
 207
 208 /**
 209  * Finalization callback.
 210  */
 211 static void
 212 sp_pen_context_finish(SPEventContext *ec)
 213 {
 214     spdc_pen_finish(SP_PEN_CONTEXT(ec), FALSE);
 215
 216     if (((SPEventContextClass *) pen_parent_class)->finish) {
 217         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 218     }
 219 }
 220
 221 /**
 222  * Callback that sets key to value in pen context.
 223  */
 224 static void
 225 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 226 {
 227     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 228
 229     if (!strcmp(key, "mode")) {
 230         if ( val && !strcmp(val, "drag") ) {
 231             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 232         } else {
 233             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 234         }
 235     }
 236 }
 237
 238 /**
 239  * Snaps new node relative to the previous node.
 240  */
 241 static void
 242 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 243 {
 244     if (pc->npoints > 0) {
 245         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 246     }
 247
 248     spdc_endpoint_snap_free(pc, p, state);
 249 }
 250
 251 /**
 252  * Snaps new node's handle relative to the new node.
 253  */
 254 static void
 255 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 256 {
 257     g_return_if_fail(( pc->npoints == 2 ||
 258                        pc->npoints == 5   ));
 259
 260     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 261     spdc_endpoint_snap_free(pc, p, state);
 262 }
 263
 264 /**
 265  * Callback to handle all pen events.
 266  */
 267 static gint
 268 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 269 {
 270     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 271
 272     gint ret = FALSE;
 273
 274     switch (event->type) {
 275         case GDK_BUTTON_PRESS:
 276             ret = pen_handle_button_press(pc, event->button);
 277             break;
 278
 279         case GDK_MOTION_NOTIFY:
 280             ret = pen_handle_motion_notify(pc, event->motion);
 281             break;
 282
 283         case GDK_BUTTON_RELEASE:
 284             ret = pen_handle_button_release(pc, event->button);
 285             break;
 286
 287         case GDK_2BUTTON_PRESS:
 288             ret = pen_handle_2button_press(pc);
 289             break;
 290
 291         case GDK_KEY_PRESS:
 292             ret = pen_handle_key_press(pc, event);
 293             break;
 294
 295         default:
 296             break;
 297     }
 298
 299     if (!ret) {
 300         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 301             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 302         if (parent_root_handler) {
 303             ret = parent_root_handler(ec, event);
 304         }
 305     }
 306
 307     return ret;
 308 }
 309
 310 /**
 311  * Handle mouse button press event.
 312  */
 313 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 314 {
 315     gint ret = FALSE;
 316     if (bevent.button == 1) {
 317
 318         SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 319         SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 320
 321         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 322             return TRUE;
 323         }
 324
 325         NR::Point const event_w(bevent.x, bevent.y);
 326         pen_drag_origin_w = event_w;
 327         pen_within_tolerance = true;
 328
 329         /* Test whether we hit any anchor. */
 330         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 331
 332         NR::Point const event_dt(desktop->w2d(event_w));
 333         switch (pc->mode) {
 334             case SP_PEN_CONTEXT_MODE_CLICK:
 335                 /* In click mode we add point on release */
 336                 switch (pc->state) {
 337                     case SP_PEN_CONTEXT_POINT:
 338                     case SP_PEN_CONTEXT_CONTROL:
 339                     case SP_PEN_CONTEXT_CLOSE:
 340                         break;
 341                     case SP_PEN_CONTEXT_STOP:
 342                         /* This is allowed, if we just cancelled curve */
 343                         pc->state = SP_PEN_CONTEXT_POINT;
 344                         break;
 345                     default:
 346                         break;
 347                 }
 348                 break;
 349             case SP_PEN_CONTEXT_MODE_DRAG:
 350                 switch (pc->state) {
 351                     case SP_PEN_CONTEXT_STOP:
 352                         /* This is allowed, if we just cancelled curve */
 353                     case SP_PEN_CONTEXT_POINT:
 354                         if (pc->npoints == 0) {
 355
 356                             /* Set start anchor */
 357                             pc->sa = anchor;
 358                             NR::Point p;
 359                             if (anchor) {
 360
 361                                 /* Adjust point to anchor if needed */
 362                                 p = anchor->dp;
 363                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 364
 365                             } else {
 366
 367                                 // This is the first click of a new curve; deselect item so that
 368                                 // this curve is not combined with it (unless it is drawn from its
 369                                 // anchor, which is handled by the sibling branch above)
 370                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 371                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 372
 373                                     selection->clear();
 374                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 375
 376                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 377
 378                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 379                                 }
 380
 381                                 /* Create green anchor */
 382                                 p = event_dt;
 383                                 spdc_endpoint_snap(pc, p, bevent.state);
 384                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 385                             }
 386                             spdc_pen_set_initial_point(pc, p);
 387                         } else {
 388
 389                             /* Set end anchor */
 390                             pc->ea = anchor;
 391                             NR::Point p;
 392                             if (anchor) {
 393
 394                                 p = anchor->dp;
 395                                 // we hit an anchor, will finish the curve (either with or without closing)
 396                                 // in release handler
 397                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 398
 399                                 if (pc->green_anchor && pc->green_anchor->active) {
 400                                     // we clicked on the current curve start, so close it even if
 401                                     // we drag a handle away from it
 402                                     dc->green_closed = TRUE;
 403                                 }
 404                                 ret = TRUE;
 405                                 break;
 406
 407                             } else {
 408
 409                                 p = event_dt;
 410                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 411                                 spdc_pen_set_subsequent_point(pc, p, true);
 412                             }
 413
 414                         }
 415                         pc->state = SP_PEN_CONTEXT_CONTROL;
 416                         ret = TRUE;
 417                         break;
 418                     case SP_PEN_CONTEXT_CONTROL:
 419                         g_warning("Button down in CONTROL state");
 420                         break;
 421                     case SP_PEN_CONTEXT_CLOSE:
 422                         g_warning("Button down in CLOSE state");
 423                         break;
 424                     default:
 425                         break;
 426                 }
 427                 break;
 428             default:
 429                 break;
 430         }
 431     } else if (bevent.button == 3) {
 432         if (pc->npoints != 0) {
 433             spdc_pen_finish(pc, FALSE);
 434             ret = TRUE;
 435         }
 436     }
 437
 438     return ret;
 439 }
 440
 441 /**
 442  * Handle motion_notify event.
 443  */
 444 static gint
 445 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 446 {
 447     gint ret = FALSE;
 448
 449     if (mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 450         // allow middle-button scrolling
 451         return FALSE;
 452     }
 453
 454     NR::Point const event_w(mevent.x,
 455                             mevent.y);
 456     if (pen_within_tolerance) {
 457         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 458                                                                "value", 0, 0, 100);
 459         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 460             return FALSE;   // Do not drag if we're within tolerance from origin.
 461         }
 462     }
 463     // Once the user has moved farther than tolerance from the original location
 464     // (indicating they intend to move the object, not click), then always process the
 465     // motion notify coordinates as given (no snapping back to origin)
 466     pen_within_tolerance = false;
 467
 468     SPDesktop *const dt = pc->desktop;
 469     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 470         /* Grab mouse, so release will not pass unnoticed */
 471         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 472         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 473                                         GDK_BUTTON_RELEASE_MASK |
 474                                         GDK_POINTER_MOTION_MASK  ),
 475                             NULL, mevent.time);
 476     }
 477
 478     /* Find desktop coordinates */
 479     NR::Point p = dt->w2d(event_w);
 480
 481     /* Test, whether we hit any anchor */
 482     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 483
 484     switch (pc->mode) {
 485         case SP_PEN_CONTEXT_MODE_CLICK:
 486             switch (pc->state) {
 487                 case SP_PEN_CONTEXT_POINT:
 488                     if ( pc->npoints != 0 ) {
 489                         /* Only set point, if we are already appending */
 490                         spdc_endpoint_snap(pc, p, mevent.state);
 491                         spdc_pen_set_subsequent_point(pc, p, true);
 492                         ret = TRUE;
 493                     }
 494                     break;
 495                 case SP_PEN_CONTEXT_CONTROL:
 496                 case SP_PEN_CONTEXT_CLOSE:
 497                     /* Placing controls is last operation in CLOSE state */
 498                     spdc_endpoint_snap(pc, p, mevent.state);
 499                     spdc_pen_set_ctrl(pc, p, mevent.state);
 500                     ret = TRUE;
 501                     break;
 502                 case SP_PEN_CONTEXT_STOP:
 503                     /* This is perfectly valid */
 504                     break;
 505                 default:
 506                     break;
 507             }
 508             break;
 509         case SP_PEN_CONTEXT_MODE_DRAG:
 510             switch (pc->state) {
 511                 case SP_PEN_CONTEXT_POINT:
 512                     if ( pc->npoints > 0 ) {
 513                         /* Only set point, if we are already appending */
 514
 515                         if (!anchor) {   /* Snap node only if not hitting anchor */
 516                             spdc_endpoint_snap(pc, p, mevent.state);
 517                         }
 518
 519                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 520
 521                         if (anchor && !pc->anchor_statusbar) {
 522                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 523                             pc->anchor_statusbar = true;
 524                         } else if (!anchor && pc->anchor_statusbar) {
 525                             pc->_message_context->clear();
 526                             pc->anchor_statusbar = false;
 527                         }
 528
 529                         ret = TRUE;
 530                     } else {
 531                         if (anchor && !pc->anchor_statusbar) {
 532                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 533                             pc->anchor_statusbar = true;
 534                         } else if (!anchor && pc->anchor_statusbar) {
 535                             pc->_message_context->clear();
 536                             pc->anchor_statusbar = false;
 537                         }
 538                     }
 539                     break;
 540                 case SP_PEN_CONTEXT_CONTROL:
 541                 case SP_PEN_CONTEXT_CLOSE:
 542                     /* Placing controls is last operation in CLOSE state */
 543
 544                     // snap the handle
 545                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 546
 547                     spdc_pen_set_ctrl(pc, p, mevent.state);
 548                     ret = TRUE;
 549                     break;
 550                 case SP_PEN_CONTEXT_STOP:
 551                     /* This is perfectly valid */
 552                     break;
 553                 default:
 554                     break;
 555             }
 556             break;
 557         default:
 558             break;
 559     }
 560     return ret;
 561 }
 562
 563 /**
 564  * Handle mouse button release event.
 565  */
 566 static gint
 567 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 568 {
 569     gint ret = FALSE;
 570     if ( revent.button == 1 ) {
 571
 572         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 573
 574         NR::Point const event_w(revent.x,
 575                                 revent.y);
 576         /* Find desktop coordinates */
 577         NR::Point p = pc->desktop->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                             /* Start new thread only with button release */
 588                             if (anchor) {
 589                                 p = anchor->dp;
 590                             }
 591                             pc->sa = anchor;
 592                             spdc_pen_set_initial_point(pc, p);
 593                         } else {
 594                             /* Set end anchor here */
 595                             pc->ea = anchor;
 596                             if (anchor) {
 597                                 p = anchor->dp;
 598                             }
 599                         }
 600                         pc->state = SP_PEN_CONTEXT_CONTROL;
 601                         ret = TRUE;
 602                         break;
 603                     case SP_PEN_CONTEXT_CONTROL:
 604                         /* End current segment */
 605                         spdc_endpoint_snap(pc, p, revent.state);
 606                         spdc_pen_finish_segment(pc, p, revent.state);
 607                         pc->state = SP_PEN_CONTEXT_POINT;
 608                         ret = TRUE;
 609                         break;
 610                     case SP_PEN_CONTEXT_CLOSE:
 611                         /* End current segment */
 612                         if (!anchor) {   /* Snap node only if not hitting anchor */
 613                             spdc_endpoint_snap(pc, p, revent.state);
 614                         }
 615                         spdc_pen_finish_segment(pc, p, revent.state);
 616                         spdc_pen_finish(pc, TRUE);
 617                         pc->state = SP_PEN_CONTEXT_POINT;
 618                         ret = TRUE;
 619                         break;
 620                     case SP_PEN_CONTEXT_STOP:
 621                         /* This is allowed, if we just cancelled curve */
 622                         pc->state = SP_PEN_CONTEXT_POINT;
 623                         ret = TRUE;
 624                         break;
 625                     default:
 626                         break;
 627                 }
 628                 break;
 629             case SP_PEN_CONTEXT_MODE_DRAG:
 630                 switch (pc->state) {
 631                     case SP_PEN_CONTEXT_POINT:
 632                     case SP_PEN_CONTEXT_CONTROL:
 633                         spdc_endpoint_snap(pc, p, revent.state);
 634                         spdc_pen_finish_segment(pc, p, revent.state);
 635                         break;
 636                     case SP_PEN_CONTEXT_CLOSE:
 637                         spdc_endpoint_snap(pc, p, revent.state);
 638                         spdc_pen_finish_segment(pc, p, revent.state);
 639                         if (pc->green_closed) {
 640                             // finishing at the start anchor, close curve
 641                             spdc_pen_finish(pc, TRUE);
 642                         } else {
 643                             // finishing at some other anchor, finish curve but not close
 644                             spdc_pen_finish(pc, FALSE);
 645                         }
 646                         break;
 647                     case SP_PEN_CONTEXT_STOP:
 648                         /* This is allowed, if we just cancelled curve */
 649                         break;
 650                     default:
 651                         break;
 652                 }
 653                 pc->state = SP_PEN_CONTEXT_POINT;
 654                 ret = TRUE;
 655                 break;
 656             default:
 657                 break;
 658         }
 659
 660         if (pc->grab) {
 661             /* Release grab now */
 662             sp_canvas_item_ungrab(pc->grab, revent.time);
 663             pc->grab = NULL;
 664         }
 665
 666         ret = TRUE;
 667
 668         dc->green_closed = FALSE;
 669     }
 670
 671     return ret;
 672 }
 673
 674 static gint
 675 pen_handle_2button_press(SPPenContext *const pc)
 676 {
 677     gint ret = FALSE;
 678     if (pc->npoints != 0) {
 679         spdc_pen_finish(pc, FALSE);
 680         ret = TRUE;
 681     }
 682     return ret;
 683 }
 684
 685 void
 686 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 687 {
 688     if (pc->npoints != 5)
 689         return;
 690
 691     // green
 692     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 693     if (bpath) {
 694         if (bpath->code == NR_CURVETO) {
 695             bpath->x2 += x;
 696             bpath->y2 += y;
 697         }
 698         bpath->x3 += x;
 699         bpath->y3 += y;
 700         if (pc->green_bpaths && pc->green_bpaths->data) {
 701             // remove old piecewise green canvasitems
 702             while (pc->green_bpaths) {
 703                 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 704                 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 705             }
 706             // one canvas bpath for all of green_curve
 707             SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 708             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 709             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 710
 711             pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 712         }
 713     } else {
 714         // start anchor too
 715         if (pc->green_anchor) {
 716             pc->green_anchor->dp += NR::Point(x, y);
 717             SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 718         }
 719     }
 720
 721     // red
 722     pc->p[0] += NR::Point(x, y);
 723     pc->p[1] += NR::Point(x, y);
 724     sp_curve_reset(pc->red_curve);
 725     sp_curve_moveto(pc->red_curve, pc->p[0]);
 726     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 727     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 728
 729     // handles
 730     if (pc->p[0] != pc->p[1]) {
 731         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 732         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 733     }
 734     if (bpath && bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 735         SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 736         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 737     }
 738 }
 739
 740 void
 741 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 742 {
 743     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 744 }
 745
 746 static void
 747 pen_cancel (SPPenContext *const pc)
 748 {
 749     pc->state = SP_PEN_CONTEXT_STOP;
 750     spdc_reset_colors(pc);
 751     sp_canvas_item_hide(pc->c0);
 752     sp_canvas_item_hide(pc->c1);
 753     sp_canvas_item_hide(pc->cl0);
 754     sp_canvas_item_hide(pc->cl1);
 755     pc->_message_context->clear();
 756     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 757 }
 758
 759 static gint
 760 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 761 {
 762     gint ret = FALSE;
 763     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 764
 765     switch (get_group0_keyval (&event->key)) {
 766
 767         case GDK_Left: // move last point left
 768         case GDK_KP_Left:
 769         case GDK_KP_4:
 770             if (!MOD__CTRL) { // not ctrl
 771                 if (MOD__ALT) { // alt
 772                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 773                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 774                 }
 775                 else { // no alt
 776                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 777                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 778                 }
 779                 ret = TRUE;
 780             }
 781             break;
 782         case GDK_Up: // move last point up
 783         case GDK_KP_Up:
 784         case GDK_KP_8:
 785             if (!MOD__CTRL) { // not ctrl
 786                 if (MOD__ALT) { // alt
 787                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 788                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 789                 }
 790                 else { // no alt
 791                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 792                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 793                 }
 794                 ret = TRUE;
 795             }
 796             break;
 797         case GDK_Right: // move last point right
 798         case GDK_KP_Right:
 799         case GDK_KP_6:
 800             if (!MOD__CTRL) { // not ctrl
 801                 if (MOD__ALT) { // alt
 802                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 803                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 804                 }
 805                 else { // no alt
 806                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 807                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 808                 }
 809                 ret = TRUE;
 810             }
 811             break;
 812         case GDK_Down: // move last point down
 813         case GDK_KP_Down:
 814         case GDK_KP_2:
 815             if (!MOD__CTRL) { // not ctrl
 816                 if (MOD__ALT) { // alt
 817                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 818                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 819                 }
 820                 else { // no alt
 821                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 822                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 823                 }
 824                 ret = TRUE;
 825             }
 826             break;
 827
 828         case GDK_Return:
 829         case GDK_KP_Enter:
 830             if (pc->npoints != 0) {
 831                 spdc_pen_finish(pc, FALSE);
 832                 ret = TRUE;
 833             }
 834             break;
 835         case GDK_Escape:
 836             if (pc->npoints != 0) {
 837                 // if drawing, cancel, otherwise pass it up for deselecting
 838                 pen_cancel (pc);
 839                 ret = TRUE;
 840             }
 841             break;
 842         case GDK_z:
 843         case GDK_Z:
 844             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 845                 // if drawing, cancel, otherwise pass it up for undo
 846                 pen_cancel (pc);
 847                 ret = TRUE;
 848             }
 849             break;
 850         case GDK_BackSpace:
 851         case GDK_Delete:
 852         case GDK_KP_Delete:
 853             if (sp_curve_is_empty(pc->green_curve)) {
 854                 /* Same as cancel */
 855                 pc->state = SP_PEN_CONTEXT_STOP;
 856                 spdc_reset_colors(pc);
 857                 sp_canvas_item_hide(pc->c0);
 858                 sp_canvas_item_hide(pc->c1);
 859                 sp_canvas_item_hide(pc->cl0);
 860                 sp_canvas_item_hide(pc->cl1);
 861                 ret = TRUE;
 862             } else {
 863                 /* Reset red curve */
 864                 sp_curve_reset(pc->red_curve);
 865                 /* Destroy topmost green bpath */
 866                 if (pc->green_bpaths) {
 867                     if (pc->green_bpaths->data)
 868                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 869                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 870                 }
 871                 /* Get last segment */
 872                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
 873                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
 874                 if ( e < 2 ) {
 875                     g_warning("Green curve length is %d", e);
 876                     break;
 877                 }
 878                 pc->p[0] = p[e - 2].c(3);
 879                 pc->p[1] = p[e - 1].c(1);
 880                 NR::Point const pt(( pc->npoints < 4
 881                                      ? p[e - 1].c(3)
 882                                      : pc->p[3] ));
 883                 pc->npoints = 2;
 884                 sp_curve_backspace(pc->green_curve);
 885                 sp_canvas_item_hide(pc->c0);
 886                 sp_canvas_item_hide(pc->c1);
 887                 sp_canvas_item_hide(pc->cl0);
 888                 sp_canvas_item_hide(pc->cl1);
 889                 pc->state = SP_PEN_CONTEXT_POINT;
 890                 spdc_pen_set_subsequent_point(pc, pt, true);
 891                 ret = TRUE;
 892             }
 893             break;
 894         default:
 895             break;
 896     }
 897     return ret;
 898 }
 899
 900 static void
 901 spdc_reset_colors(SPPenContext *pc)
 902 {
 903     /* Red */
 904     sp_curve_reset(pc->red_curve);
 905     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
 906     /* Blue */
 907     sp_curve_reset(pc->blue_curve);
 908     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
 909     /* Green */
 910     while (pc->green_bpaths) {
 911         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 912         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 913     }
 914     sp_curve_reset(pc->green_curve);
 915     if (pc->green_anchor) {
 916         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
 917     }
 918     pc->sa = NULL;
 919     pc->ea = NULL;
 920     pc->npoints = 0;
 921     pc->red_curve_is_valid = false;
 922 }
 923
 924
 925 static void
 926 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
 927 {
 928     g_assert( pc->npoints == 0 );
 929
 930     pc->p[0] = p;
 931     pc->p[1] = p;
 932     pc->npoints = 2;
 933     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
 934 }
 935
 936 static void
 937 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
 938 {
 939     g_assert( pc->npoints != 0 );
 940     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
 941
 942     pc->p[2] = p;
 943     pc->p[3] = p;
 944     pc->p[4] = p;
 945     pc->npoints = 5;
 946     sp_curve_reset(pc->red_curve);
 947     sp_curve_moveto(pc->red_curve, pc->p[0]);
 948     bool is_curve;
 949     if ( (pc->onlycurves)
 950          || ( pc->p[1] != pc->p[0] ) )
 951     {
 952         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
 953         is_curve = true;
 954     } else {
 955         sp_curve_lineto(pc->red_curve, p);
 956         is_curve = false;
 957     }
 958     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 959
 960     if (statusbar) {
 961         // status text
 962         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
 963         NR::Point rel = p - pc->p[0];
 964         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
 965         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
 966         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
 967             angle = angle_to_compass (angle);
 968         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path"), is_curve? "Curve segment" : "Line segment", angle, dist->str);
 969         g_string_free(dist, FALSE);
 970     }
 971 }
 972
 973 static void
 974 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
 975 {
 976     sp_canvas_item_show(pc->c1);
 977     sp_canvas_item_show(pc->cl1);
 978
 979     if ( pc->npoints == 2 ) {
 980         pc->p[1] = p;
 981         sp_canvas_item_hide(pc->c0);
 982         sp_canvas_item_hide(pc->cl0);
 983         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 984         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 985
 986         // status text
 987         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
 988         NR::Point rel = p - pc->p[0];
 989         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
 990         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
 991         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
 992             angle = angle_to_compass (angle);
 993         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Curve handle</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
 994         g_string_free(dist, FALSE);
 995
 996     } else if ( pc->npoints == 5 ) {
 997         pc->p[4] = p;
 998         sp_canvas_item_show(pc->c0);
 999         sp_canvas_item_show(pc->cl0);
1000         bool is_symm = false;
1001         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1002              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1003             NR::Point delta = p - pc->p[3];
1004             pc->p[2] = pc->p[3] - delta;
1005             is_symm = true;
1006             sp_curve_reset(pc->red_curve);
1007             sp_curve_moveto(pc->red_curve, pc->p[0]);
1008             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1009             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1010         }
1011         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1012         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1013         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1014         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1015
1016         // status text
1017         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1018         NR::Point rel = p - pc->p[3];
1019         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1020         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1021         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1022             angle = angle_to_compass (angle);
1023         pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f&#176;, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only"), is_symm? "Curve handle, symmetric" : "Curve handle", angle, dist->str);
1024         g_string_free(dist, FALSE);
1025
1026     } else {
1027         g_warning("Something bad happened - npoints is %d", pc->npoints);
1028     }
1029 }
1030
1031 static void
1032 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1033 {
1034     if (!sp_curve_empty(pc->red_curve)) {
1035         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1036         SPCurve *curve = sp_curve_copy(pc->red_curve);
1037         /// \todo fixme:
1038         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1039         sp_curve_unref(curve);
1040         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1041
1042         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1043
1044         pc->p[0] = pc->p[3];
1045         pc->p[1] = pc->p[4];
1046         pc->npoints = 2;
1047
1048         sp_curve_reset(pc->red_curve);
1049     }
1050 }
1051
1052 static void
1053 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1054 {
1055     SPDesktop *const desktop = pc->desktop;
1056     pc->_message_context->clear();
1057     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1058
1059     sp_curve_reset(pc->red_curve);
1060     spdc_concat_colors_and_flush(pc, closed);
1061     pc->sa = NULL;
1062     pc->ea = NULL;
1063
1064     pc->npoints = 0;
1065     pc->state = SP_PEN_CONTEXT_POINT;
1066
1067     sp_canvas_item_hide(pc->c0);
1068     sp_canvas_item_hide(pc->c1);
1069     sp_canvas_item_hide(pc->cl0);
1070     sp_canvas_item_hide(pc->cl1);
1071
1072     if (pc->green_anchor) {
1073         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1074     }
1075 }
1076
1077
1078 /*
1079   Local Variables:
1080   mode:c++
1081   c-file-style:"stroustrup"
1082   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1083   indent-tabs-mode:nil
1084   fill-column:99
1085   End:
1086 */
1087 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :