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 "pixmaps/cursor-pen.pixbuf"
  34 #include "display/canvas-bpath.h"
  35 #include "display/sp-ctrlline.h"
  36 #include "display/sodipodi-ctrl.h"
  37 #include <glibmm/i18n.h>
  38 #include "libnr/n-art-bpath.h"
  39 #include "helper/units.h"
  40 #include "macros.h"
  41 #include "context-fns.h"
  42
  43
  44 static void sp_pen_context_class_init(SPPenContextClass *klass);
  45 static void sp_pen_context_init(SPPenContext *pc);
  46 static void sp_pen_context_dispose(GObject *object);
  47
  48 static void sp_pen_context_setup(SPEventContext *ec);
  49 static void sp_pen_context_finish(SPEventContext *ec);
  50 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  51 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
  52
  53 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
  54 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
  55 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
  56 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
  57
  58 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
  59
  60 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
  61 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
  62 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
  63 static gint pen_handle_2button_press(SPPenContext *const pc);
  64 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
  65 static void spdc_reset_colors(SPPenContext *pc);
  66
  67
  68 static NR::Point pen_drag_origin_w(0, 0);
  69 static bool pen_within_tolerance = false;
  70
  71 static SPDrawContextClass *pen_parent_class;
  72
  73 /**
  74  * Register SPPenContext with Gdk and return its type.
  75  */
  76 GType
  77 sp_pen_context_get_type(void)
  78 {
  79     static GType type = 0;
  80     if (!type) {
  81         GTypeInfo info = {
  82             sizeof(SPPenContextClass),
  83             NULL, NULL,
  84             (GClassInitFunc) sp_pen_context_class_init,
  85             NULL, NULL,
  86             sizeof(SPPenContext),
  87             4,
  88             (GInstanceInitFunc) sp_pen_context_init,
  89             NULL,   /* value_table */
  90         };
  91         type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
  92     }
  93     return type;
  94 }
  95
  96 /**
  97  * Initialize the SPPenContext vtable.
  98  */
  99 static void
 100 sp_pen_context_class_init(SPPenContextClass *klass)
 101 {
 102     GObjectClass *object_class;
 103     SPEventContextClass *event_context_class;
 104
 105     object_class = (GObjectClass *) klass;
 106     event_context_class = (SPEventContextClass *) klass;
 107
 108     pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
 109
 110     object_class->dispose = sp_pen_context_dispose;
 111
 112     event_context_class->setup = sp_pen_context_setup;
 113     event_context_class->finish = sp_pen_context_finish;
 114     event_context_class->set = sp_pen_context_set;
 115     event_context_class->root_handler = sp_pen_context_root_handler;
 116 }
 117
 118 /**
 119  * Callback to initialize SPPenContext object.
 120  */
 121 static void
 122 sp_pen_context_init(SPPenContext *pc)
 123 {
 124
 125     SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
 126
 127     event_context->cursor_shape = cursor_pen_xpm;
 128     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 129             -1,
 130             cursor_pen_pixbuf,
 131             FALSE,
 132             NULL);
 133     event_context->hot_x = 4;
 134     event_context->hot_y = 4;
 135
 136     pc->npoints = 0;
 137     pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 138     pc->state = SP_PEN_CONTEXT_POINT;
 139
 140     pc->c0 = NULL;
 141     pc->c1 = NULL;
 142     pc->cl0 = NULL;
 143     pc->cl1 = NULL;
 144 }
 145
 146 /**
 147  * Callback to destroy the SPPenContext object's members and itself.
 148  */
 149 static void
 150 sp_pen_context_dispose(GObject *object)
 151 {
 152     SPPenContext *pc;
 153
 154     pc = SP_PEN_CONTEXT(object);
 155
 156     if (pc->c0) {
 157         gtk_object_destroy(GTK_OBJECT(pc->c0));
 158         pc->c0 = NULL;
 159     }
 160     if (pc->c1) {
 161         gtk_object_destroy(GTK_OBJECT(pc->c1));
 162         pc->c1 = NULL;
 163     }
 164     if (pc->cl0) {
 165         gtk_object_destroy(GTK_OBJECT(pc->cl0));
 166         pc->cl0 = NULL;
 167     }
 168     if (pc->cl1) {
 169         gtk_object_destroy(GTK_OBJECT(pc->cl1));
 170         pc->cl1 = NULL;
 171     }
 172
 173     G_OBJECT_CLASS(pen_parent_class)->dispose(object);
 174 }
 175
 176 /**
 177  * Callback to initialize SPPenContext object.
 178  */
 179 static void
 180 sp_pen_context_setup(SPEventContext *ec)
 181 {
 182     SPPenContext *pc;
 183
 184     pc = SP_PEN_CONTEXT(ec);
 185
 186     if (((SPEventContextClass *) pen_parent_class)->setup) {
 187         ((SPEventContextClass *) pen_parent_class)->setup(ec);
 188     }
 189
 190     /* Pen indicators */
 191     pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 192                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 193     pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
 194                                 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
 195     pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 196     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
 197     pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
 198     sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
 199
 200     sp_canvas_item_hide(pc->c0);
 201     sp_canvas_item_hide(pc->c1);
 202     sp_canvas_item_hide(pc->cl0);
 203     sp_canvas_item_hide(pc->cl1);
 204
 205     sp_event_context_read(ec, "mode");
 206
 207     pc->anchor_statusbar = false;
 208
 209     if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
 210         ec->enableSelectionCue();
 211     }
 212 }
 213
 214 static void
 215 pen_cancel (SPPenContext *const pc)
 216 {
 217     pc->state = SP_PEN_CONTEXT_STOP;
 218     spdc_reset_colors(pc);
 219     sp_canvas_item_hide(pc->c0);
 220     sp_canvas_item_hide(pc->c1);
 221     sp_canvas_item_hide(pc->cl0);
 222     sp_canvas_item_hide(pc->cl1);
 223     pc->_message_context->clear();
 224     pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
 225 }
 226
 227 /**
 228  * Finalization callback.
 229  */
 230 static void
 231 sp_pen_context_finish(SPEventContext *ec)
 232 {
 233     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 234
 235     if (pc->npoints != 0) {
 236         pen_cancel (pc);
 237     }
 238
 239     if (((SPEventContextClass *) pen_parent_class)->finish) {
 240         ((SPEventContextClass *) pen_parent_class)->finish(ec);
 241     }
 242 }
 243
 244 /**
 245  * Callback that sets key to value in pen context.
 246  */
 247 static void
 248 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 249 {
 250     SPPenContext *pc = SP_PEN_CONTEXT(ec);
 251
 252     if (!strcmp(key, "mode")) {
 253         if ( val && !strcmp(val, "drag") ) {
 254             pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
 255         } else {
 256             pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
 257         }
 258     }
 259 }
 260
 261 /**
 262  * Snaps new node relative to the previous node.
 263  */
 264 static void
 265 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
 266 {
 267     if (pc->npoints > 0) {
 268         spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
 269     }
 270
 271     spdc_endpoint_snap_free(pc, p, state);
 272 }
 273
 274 /**
 275  * Snaps new node's handle relative to the new node.
 276  */
 277 static void
 278 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
 279 {
 280     g_return_if_fail(( pc->npoints == 2 ||
 281                        pc->npoints == 5   ));
 282
 283     spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
 284     spdc_endpoint_snap_free(pc, p, state);
 285 }
 286
 287 /**
 288  * Callback to handle all pen events.
 289  */
 290 static gint
 291 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
 292 {
 293     SPPenContext *const pc = SP_PEN_CONTEXT(ec);
 294
 295     gint ret = FALSE;
 296
 297     switch (event->type) {
 298         case GDK_BUTTON_PRESS:
 299             ret = pen_handle_button_press(pc, event->button);
 300             break;
 301
 302         case GDK_MOTION_NOTIFY:
 303             ret = pen_handle_motion_notify(pc, event->motion);
 304             break;
 305
 306         case GDK_BUTTON_RELEASE:
 307             ret = pen_handle_button_release(pc, event->button);
 308             break;
 309
 310         case GDK_2BUTTON_PRESS:
 311             ret = pen_handle_2button_press(pc);
 312             break;
 313
 314         case GDK_KEY_PRESS:
 315             ret = pen_handle_key_press(pc, event);
 316             break;
 317
 318         default:
 319             break;
 320     }
 321
 322     if (!ret) {
 323         gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
 324             = ((SPEventContextClass *) pen_parent_class)->root_handler;
 325         if (parent_root_handler) {
 326             ret = parent_root_handler(ec, event);
 327         }
 328     }
 329
 330     return ret;
 331 }
 332
 333 /**
 334  * Handle mouse button press event.
 335  */
 336 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
 337 {
 338     gint ret = FALSE;
 339     if (bevent.button == 1) {
 340
 341         SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
 342         SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 343
 344         if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 345             return TRUE;
 346         }
 347
 348         NR::Point const event_w(bevent.x, bevent.y);
 349         pen_drag_origin_w = event_w;
 350         pen_within_tolerance = true;
 351
 352         /* Test whether we hit any anchor. */
 353         SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
 354
 355         NR::Point const event_dt(desktop->w2d(event_w));
 356         switch (pc->mode) {
 357             case SP_PEN_CONTEXT_MODE_CLICK:
 358                 /* In click mode we add point on release */
 359                 switch (pc->state) {
 360                     case SP_PEN_CONTEXT_POINT:
 361                     case SP_PEN_CONTEXT_CONTROL:
 362                     case SP_PEN_CONTEXT_CLOSE:
 363                         break;
 364                     case SP_PEN_CONTEXT_STOP:
 365                         /* This is allowed, if we just cancelled curve */
 366                         pc->state = SP_PEN_CONTEXT_POINT;
 367                         break;
 368                     default:
 369                         break;
 370                 }
 371                 break;
 372             case SP_PEN_CONTEXT_MODE_DRAG:
 373                 switch (pc->state) {
 374                     case SP_PEN_CONTEXT_STOP:
 375                         /* This is allowed, if we just cancelled curve */
 376                     case SP_PEN_CONTEXT_POINT:
 377                         if (pc->npoints == 0) {
 378
 379                             /* Set start anchor */
 380                             pc->sa = anchor;
 381                             NR::Point p;
 382                             if (anchor) {
 383
 384                                 /* Adjust point to anchor if needed */
 385                                 p = anchor->dp;
 386                                 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
 387
 388                             } else {
 389
 390                                 // This is the first click of a new curve; deselect item so that
 391                                 // this curve is not combined with it (unless it is drawn from its
 392                                 // anchor, which is handled by the sibling branch above)
 393                                 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
 394                                 if (!(bevent.state & GDK_SHIFT_MASK)) {
 395
 396                                     selection->clear();
 397                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
 398
 399                                 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
 400
 401                                     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
 402                                 }
 403
 404                                 /* Create green anchor */
 405                                 p = event_dt;
 406                                 spdc_endpoint_snap(pc, p, bevent.state);
 407                                 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
 408                             }
 409                             spdc_pen_set_initial_point(pc, p);
 410                         } else {
 411
 412                             /* Set end anchor */
 413                             pc->ea = anchor;
 414                             NR::Point p;
 415                             if (anchor) {
 416
 417                                 p = anchor->dp;
 418                                 // we hit an anchor, will finish the curve (either with or without closing)
 419                                 // in release handler
 420                                 pc->state = SP_PEN_CONTEXT_CLOSE;
 421
 422                                 if (pc->green_anchor && pc->green_anchor->active) {
 423                                     // we clicked on the current curve start, so close it even if
 424                                     // we drag a handle away from it
 425                                     dc->green_closed = TRUE;
 426                                 }
 427                                 ret = TRUE;
 428                                 break;
 429
 430                             } else {
 431
 432                                 p = event_dt;
 433                                 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
 434                                 spdc_pen_set_subsequent_point(pc, p, true);
 435                             }
 436
 437                         }
 438                         pc->state = SP_PEN_CONTEXT_CONTROL;
 439                         ret = TRUE;
 440                         break;
 441                     case SP_PEN_CONTEXT_CONTROL:
 442                         g_warning("Button down in CONTROL state");
 443                         break;
 444                     case SP_PEN_CONTEXT_CLOSE:
 445                         g_warning("Button down in CLOSE state");
 446                         break;
 447                     default:
 448                         break;
 449                 }
 450                 break;
 451             default:
 452                 break;
 453         }
 454     } else if (bevent.button == 3) {
 455         if (pc->npoints != 0) {
 456             spdc_pen_finish(pc, FALSE);
 457             ret = TRUE;
 458         }
 459     }
 460
 461     return ret;
 462 }
 463
 464 /**
 465  * Handle motion_notify event.
 466  */
 467 static gint
 468 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
 469 {
 470     gint ret = FALSE;
 471
 472     if (mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
 473         // allow middle-button scrolling
 474         return FALSE;
 475     }
 476
 477     NR::Point const event_w(mevent.x,
 478                             mevent.y);
 479     if (pen_within_tolerance) {
 480         gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
 481                                                                "value", 0, 0, 100);
 482         if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
 483             return FALSE;   // Do not drag if we're within tolerance from origin.
 484         }
 485     }
 486     // Once the user has moved farther than tolerance from the original location
 487     // (indicating they intend to move the object, not click), then always process the
 488     // motion notify coordinates as given (no snapping back to origin)
 489     pen_within_tolerance = false;
 490
 491     SPDesktop *const dt = pc->desktop;
 492     if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
 493         /* Grab mouse, so release will not pass unnoticed */
 494         pc->grab = SP_CANVAS_ITEM(dt->acetate);
 495         sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK   |
 496                                         GDK_BUTTON_RELEASE_MASK |
 497                                         GDK_POINTER_MOTION_MASK  ),
 498                             NULL, mevent.time);
 499     }
 500
 501     /* Find desktop coordinates */
 502     NR::Point p = dt->w2d(event_w);
 503
 504     /* Test, whether we hit any anchor */
 505     SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 506
 507     switch (pc->mode) {
 508         case SP_PEN_CONTEXT_MODE_CLICK:
 509             switch (pc->state) {
 510                 case SP_PEN_CONTEXT_POINT:
 511                     if ( pc->npoints != 0 ) {
 512                         /* Only set point, if we are already appending */
 513                         spdc_endpoint_snap(pc, p, mevent.state);
 514                         spdc_pen_set_subsequent_point(pc, p, true);
 515                         ret = TRUE;
 516                     }
 517                     break;
 518                 case SP_PEN_CONTEXT_CONTROL:
 519                 case SP_PEN_CONTEXT_CLOSE:
 520                     /* Placing controls is last operation in CLOSE state */
 521                     spdc_endpoint_snap(pc, p, mevent.state);
 522                     spdc_pen_set_ctrl(pc, p, mevent.state);
 523                     ret = TRUE;
 524                     break;
 525                 case SP_PEN_CONTEXT_STOP:
 526                     /* This is perfectly valid */
 527                     break;
 528                 default:
 529                     break;
 530             }
 531             break;
 532         case SP_PEN_CONTEXT_MODE_DRAG:
 533             switch (pc->state) {
 534                 case SP_PEN_CONTEXT_POINT:
 535                     if ( pc->npoints > 0 ) {
 536                         /* Only set point, if we are already appending */
 537
 538                         if (!anchor) {   /* Snap node only if not hitting anchor */
 539                             spdc_endpoint_snap(pc, p, mevent.state);
 540                         }
 541
 542                         spdc_pen_set_subsequent_point(pc, p, !anchor);
 543
 544                         if (anchor && !pc->anchor_statusbar) {
 545                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
 546                             pc->anchor_statusbar = true;
 547                         } else if (!anchor && pc->anchor_statusbar) {
 548                             pc->_message_context->clear();
 549                             pc->anchor_statusbar = false;
 550                         }
 551
 552                         ret = TRUE;
 553                     } else {
 554                         if (anchor && !pc->anchor_statusbar) {
 555                             pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
 556                             pc->anchor_statusbar = true;
 557                         } else if (!anchor && pc->anchor_statusbar) {
 558                             pc->_message_context->clear();
 559                             pc->anchor_statusbar = false;
 560                         }
 561                     }
 562                     break;
 563                 case SP_PEN_CONTEXT_CONTROL:
 564                 case SP_PEN_CONTEXT_CLOSE:
 565                     /* Placing controls is last operation in CLOSE state */
 566
 567                     // snap the handle
 568                     spdc_endpoint_snap_handle(pc, p, mevent.state);
 569
 570                     spdc_pen_set_ctrl(pc, p, mevent.state);
 571                     ret = TRUE;
 572                     break;
 573                 case SP_PEN_CONTEXT_STOP:
 574                     /* This is perfectly valid */
 575                     break;
 576                 default:
 577                     break;
 578             }
 579             break;
 580         default:
 581             break;
 582     }
 583     return ret;
 584 }
 585
 586 /**
 587  * Handle mouse button release event.
 588  */
 589 static gint
 590 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
 591 {
 592     gint ret = FALSE;
 593     if ( revent.button == 1 ) {
 594
 595         SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
 596
 597         NR::Point const event_w(revent.x,
 598                                 revent.y);
 599         /* Find desktop coordinates */
 600         NR::Point p = pc->desktop->w2d(event_w);
 601
 602         /* Test whether we hit any anchor. */
 603         SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
 604
 605         switch (pc->mode) {
 606             case SP_PEN_CONTEXT_MODE_CLICK:
 607                 switch (pc->state) {
 608                     case SP_PEN_CONTEXT_POINT:
 609                         if ( pc->npoints == 0 ) {
 610                             /* Start new thread only with button release */
 611                             if (anchor) {
 612                                 p = anchor->dp;
 613                             }
 614                             pc->sa = anchor;
 615                             spdc_pen_set_initial_point(pc, p);
 616                         } else {
 617                             /* Set end anchor here */
 618                             pc->ea = anchor;
 619                             if (anchor) {
 620                                 p = anchor->dp;
 621                             }
 622                         }
 623                         pc->state = SP_PEN_CONTEXT_CONTROL;
 624                         ret = TRUE;
 625                         break;
 626                     case SP_PEN_CONTEXT_CONTROL:
 627                         /* End current segment */
 628                         spdc_endpoint_snap(pc, p, revent.state);
 629                         spdc_pen_finish_segment(pc, p, revent.state);
 630                         pc->state = SP_PEN_CONTEXT_POINT;
 631                         ret = TRUE;
 632                         break;
 633                     case SP_PEN_CONTEXT_CLOSE:
 634                         /* End current segment */
 635                         if (!anchor) {   /* Snap node only if not hitting anchor */
 636                             spdc_endpoint_snap(pc, p, revent.state);
 637                         }
 638                         spdc_pen_finish_segment(pc, p, revent.state);
 639                         spdc_pen_finish(pc, TRUE);
 640                         pc->state = SP_PEN_CONTEXT_POINT;
 641                         ret = TRUE;
 642                         break;
 643                     case SP_PEN_CONTEXT_STOP:
 644                         /* This is allowed, if we just cancelled curve */
 645                         pc->state = SP_PEN_CONTEXT_POINT;
 646                         ret = TRUE;
 647                         break;
 648                     default:
 649                         break;
 650                 }
 651                 break;
 652             case SP_PEN_CONTEXT_MODE_DRAG:
 653                 switch (pc->state) {
 654                     case SP_PEN_CONTEXT_POINT:
 655                     case SP_PEN_CONTEXT_CONTROL:
 656                         spdc_endpoint_snap(pc, p, revent.state);
 657                         spdc_pen_finish_segment(pc, p, revent.state);
 658                         break;
 659                     case SP_PEN_CONTEXT_CLOSE:
 660                         spdc_endpoint_snap(pc, p, revent.state);
 661                         spdc_pen_finish_segment(pc, p, revent.state);
 662                         if (pc->green_closed) {
 663                             // finishing at the start anchor, close curve
 664                             spdc_pen_finish(pc, TRUE);
 665                         } else {
 666                             // finishing at some other anchor, finish curve but not close
 667                             spdc_pen_finish(pc, FALSE);
 668                         }
 669                         break;
 670                     case SP_PEN_CONTEXT_STOP:
 671                         /* This is allowed, if we just cancelled curve */
 672                         break;
 673                     default:
 674                         break;
 675                 }
 676                 pc->state = SP_PEN_CONTEXT_POINT;
 677                 ret = TRUE;
 678                 break;
 679             default:
 680                 break;
 681         }
 682
 683         if (pc->grab) {
 684             /* Release grab now */
 685             sp_canvas_item_ungrab(pc->grab, revent.time);
 686             pc->grab = NULL;
 687         }
 688
 689         ret = TRUE;
 690
 691         dc->green_closed = FALSE;
 692     }
 693
 694     return ret;
 695 }
 696
 697 static gint
 698 pen_handle_2button_press(SPPenContext *const pc)
 699 {
 700     gint ret = FALSE;
 701     if (pc->npoints != 0) {
 702         spdc_pen_finish(pc, FALSE);
 703         ret = TRUE;
 704     }
 705     return ret;
 706 }
 707
 708 void
 709 pen_redraw_all (SPPenContext *const pc)
 710 {
 711     // green
 712     if (pc->green_bpaths) {
 713         // remove old piecewise green canvasitems
 714         while (pc->green_bpaths) {
 715             gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 716             pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 717         }
 718         // one canvas bpath for all of green_curve
 719         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
 720         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 721         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
 722
 723         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
 724     }
 725
 726     if (pc->green_anchor)
 727         SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
 728
 729     sp_curve_reset(pc->red_curve);
 730     sp_curve_moveto(pc->red_curve, pc->p[0]);
 731     sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
 732     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
 733
 734     // handles
 735     if (pc->p[0] != pc->p[1]) {
 736         SP_CTRL(pc->c1)->moveto(pc->p[1]);
 737         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
 738         sp_canvas_item_show (pc->c1);
 739         sp_canvas_item_show (pc->cl1);
 740     } else {
 741         sp_canvas_item_hide (pc->c1);
 742         sp_canvas_item_hide (pc->cl1);
 743     }
 744
 745     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 746     if (bpath) {
 747         if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
 748             SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
 749             sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
 750             sp_canvas_item_show (pc->c0);
 751             sp_canvas_item_show (pc->cl0);
 752         } else {
 753             sp_canvas_item_hide (pc->c0);
 754             sp_canvas_item_hide (pc->cl0);
 755         }
 756     }
 757 }
 758
 759 void
 760 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
 761 {
 762     if (pc->npoints != 5)
 763         return;
 764
 765     // green
 766     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 767     if (bpath) {
 768         if (bpath->code == NR_CURVETO) {
 769             bpath->x2 += x;
 770             bpath->y2 += y;
 771         }
 772         bpath->x3 += x;
 773         bpath->y3 += y;
 774     } else {
 775         // start anchor too
 776         if (pc->green_anchor) {
 777             pc->green_anchor->dp += NR::Point(x, y);
 778         }
 779     }
 780
 781     // red
 782     pc->p[0] += NR::Point(x, y);
 783     pc->p[1] += NR::Point(x, y);
 784     pen_redraw_all(pc);
 785 }
 786
 787 void
 788 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
 789 {
 790     pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
 791 }
 792
 793 void
 794 pen_lastpoint_tocurve (SPPenContext *const pc)
 795 {
 796     if (pc->npoints != 5)
 797         return;
 798
 799     // red
 800     NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
 801     if (bpath && bpath->code == NR_CURVETO) {
 802         pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
 803     } else {
 804         pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
 805     }
 806
 807     pen_redraw_all(pc);
 808 }
 809
 810 void
 811 pen_lastpoint_toline (SPPenContext *const pc)
 812 {
 813     if (pc->npoints != 5)
 814         return;
 815
 816     pc->p[1] = pc->p[0];
 817
 818     pen_redraw_all(pc);
 819 }
 820
 821
 822 static gint
 823 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
 824 {
 825     gint ret = FALSE;
 826     gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
 827
 828     switch (get_group0_keyval (&event->key)) {
 829
 830         case GDK_Left: // move last point left
 831         case GDK_KP_Left:
 832         case GDK_KP_4:
 833             if (!MOD__CTRL) { // not ctrl
 834                 if (MOD__ALT) { // alt
 835                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
 836                     else pen_lastpoint_move_screen(pc, -1, 0); // no shift
 837                 }
 838                 else { // no alt
 839                     if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
 840                     else pen_lastpoint_move(pc, -nudge, 0); // no shift
 841                 }
 842                 ret = TRUE;
 843             }
 844             break;
 845         case GDK_Up: // move last point up
 846         case GDK_KP_Up:
 847         case GDK_KP_8:
 848             if (!MOD__CTRL) { // not ctrl
 849                 if (MOD__ALT) { // alt
 850                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
 851                     else pen_lastpoint_move_screen(pc, 0, 1); // no shift
 852                 }
 853                 else { // no alt
 854                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
 855                     else pen_lastpoint_move(pc, 0, nudge); // no shift
 856                 }
 857                 ret = TRUE;
 858             }
 859             break;
 860         case GDK_Right: // move last point right
 861         case GDK_KP_Right:
 862         case GDK_KP_6:
 863             if (!MOD__CTRL) { // not ctrl
 864                 if (MOD__ALT) { // alt
 865                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
 866                     else pen_lastpoint_move_screen(pc, 1, 0); // no shift
 867                 }
 868                 else { // no alt
 869                     if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
 870                     else pen_lastpoint_move(pc, nudge, 0); // no shift
 871                 }
 872                 ret = TRUE;
 873             }
 874             break;
 875         case GDK_Down: // move last point down
 876         case GDK_KP_Down:
 877         case GDK_KP_2:
 878             if (!MOD__CTRL) { // not ctrl
 879                 if (MOD__ALT) { // alt
 880                     if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
 881                     else pen_lastpoint_move_screen(pc, 0, -1); // no shift
 882                 }
 883                 else { // no alt
 884                     if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
 885                     else pen_lastpoint_move(pc, 0, -nudge); // no shift
 886                 }
 887                 ret = TRUE;
 888             }
 889             break;
 890
 891         case GDK_U:
 892         case GDK_u:
 893             if (MOD__SHIFT_ONLY) {
 894                 pen_lastpoint_tocurve(pc);
 895                 ret = TRUE;
 896             }
 897             break;
 898         case GDK_L:
 899         case GDK_l:
 900             if (MOD__SHIFT_ONLY) {
 901                 pen_lastpoint_toline(pc);
 902                 ret = TRUE;
 903             }
 904             break;
 905
 906         case GDK_Return:
 907         case GDK_KP_Enter:
 908             if (pc->npoints != 0) {
 909                 spdc_pen_finish(pc, FALSE);
 910                 ret = TRUE;
 911             }
 912             break;
 913         case GDK_Escape:
 914             if (pc->npoints != 0) {
 915                 // if drawing, cancel, otherwise pass it up for deselecting
 916                 pen_cancel (pc);
 917                 ret = TRUE;
 918             }
 919             break;
 920         case GDK_z:
 921         case GDK_Z:
 922             if (MOD__CTRL_ONLY && pc->npoints != 0) {
 923                 // if drawing, cancel, otherwise pass it up for undo
 924                 pen_cancel (pc);
 925                 ret = TRUE;
 926             }
 927             break;
 928         case GDK_BackSpace:
 929         case GDK_Delete:
 930         case GDK_KP_Delete:
 931             if (sp_curve_is_empty(pc->green_curve)) {
 932                 pen_cancel (pc);
 933                 ret = TRUE;
 934             } else {
 935                 /* Reset red curve */
 936                 sp_curve_reset(pc->red_curve);
 937                 /* Destroy topmost green bpath */
 938                 if (pc->green_bpaths) {
 939                     if (pc->green_bpaths->data)
 940                         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 941                     pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 942                 }
 943                 /* Get last segment */
 944                 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
 945                 gint const e = SP_CURVE_LENGTH(pc->green_curve);
 946                 if ( e < 2 ) {
 947                     g_warning("Green curve length is %d", e);
 948                     break;
 949                 }
 950                 pc->p[0] = p[e - 2].c(3);
 951                 if (p[e - 1].code == NR_CURVETO) {
 952                     pc->p[1] = p[e - 1].c(1);
 953                 } else {
 954                     pc->p[1] = pc->p[0];
 955                 }
 956                 NR::Point const pt(( pc->npoints < 4
 957                                      ? p[e - 1].c(3)
 958                                      : pc->p[3] ));
 959                 pc->npoints = 2;
 960                 sp_curve_backspace(pc->green_curve);
 961                 sp_canvas_item_hide(pc->c0);
 962                 sp_canvas_item_hide(pc->c1);
 963                 sp_canvas_item_hide(pc->cl0);
 964                 sp_canvas_item_hide(pc->cl1);
 965                 pc->state = SP_PEN_CONTEXT_POINT;
 966                 spdc_pen_set_subsequent_point(pc, pt, true);
 967                 ret = TRUE;
 968             }
 969             break;
 970         default:
 971             break;
 972     }
 973     return ret;
 974 }
 975
 976 static void
 977 spdc_reset_colors(SPPenContext *pc)
 978 {
 979     /* Red */
 980     sp_curve_reset(pc->red_curve);
 981     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
 982     /* Blue */
 983     sp_curve_reset(pc->blue_curve);
 984     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
 985     /* Green */
 986     while (pc->green_bpaths) {
 987         gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
 988         pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
 989     }
 990     sp_curve_reset(pc->green_curve);
 991     if (pc->green_anchor) {
 992         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
 993     }
 994     pc->sa = NULL;
 995     pc->ea = NULL;
 996     pc->npoints = 0;
 997     pc->red_curve_is_valid = false;
 998 }
 999
1000
1001 static void
1002 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1003 {
1004     g_assert( pc->npoints == 0 );
1005
1006     pc->p[0] = p;
1007     pc->p[1] = p;
1008     pc->npoints = 2;
1009     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1010 }
1011
1012 static void
1013 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1014 {
1015     g_assert( pc->npoints != 0 );
1016     /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1017
1018     pc->p[2] = p;
1019     pc->p[3] = p;
1020     pc->p[4] = p;
1021     pc->npoints = 5;
1022     sp_curve_reset(pc->red_curve);
1023     sp_curve_moveto(pc->red_curve, pc->p[0]);
1024     bool is_curve;
1025     if ( (pc->onlycurves)
1026          || ( pc->p[1] != pc->p[0] ) )
1027     {
1028         sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1029         is_curve = true;
1030     } else {
1031         sp_curve_lineto(pc->red_curve, p);
1032         is_curve = false;
1033     }
1034     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1035
1036     if (statusbar) {
1037         // status text
1038         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1039         NR::Point rel = p - pc->p[0];
1040         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1041         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1042         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1043             angle = angle_to_compass (angle);
1044         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);
1045         g_string_free(dist, FALSE);
1046     }
1047 }
1048
1049 static void
1050 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1051 {
1052     sp_canvas_item_show(pc->c1);
1053     sp_canvas_item_show(pc->cl1);
1054
1055     if ( pc->npoints == 2 ) {
1056         pc->p[1] = p;
1057         sp_canvas_item_hide(pc->c0);
1058         sp_canvas_item_hide(pc->cl0);
1059         SP_CTRL(pc->c1)->moveto(pc->p[1]);
1060         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1061
1062         // status text
1063         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1064         NR::Point rel = p - pc->p[0];
1065         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1066         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1067         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1068             angle = angle_to_compass (angle);
1069         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);
1070         g_string_free(dist, FALSE);
1071
1072     } else if ( pc->npoints == 5 ) {
1073         pc->p[4] = p;
1074         sp_canvas_item_show(pc->c0);
1075         sp_canvas_item_show(pc->cl0);
1076         bool is_symm = false;
1077         if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1078              ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) &&  !( state & GDK_SHIFT_MASK  ) ) ) {
1079             NR::Point delta = p - pc->p[3];
1080             pc->p[2] = pc->p[3] - delta;
1081             is_symm = true;
1082             sp_curve_reset(pc->red_curve);
1083             sp_curve_moveto(pc->red_curve, pc->p[0]);
1084             sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1085             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1086         }
1087         SP_CTRL(pc->c0)->moveto(pc->p[2]);
1088         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1089         SP_CTRL(pc->c1)->moveto(pc->p[4]);
1090         sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1091
1092         // status text
1093         SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1094         NR::Point rel = p - pc->p[3];
1095         GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1096         double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1097         if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1098             angle = angle_to_compass (angle);
1099         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);
1100         g_string_free(dist, FALSE);
1101
1102     } else {
1103         g_warning("Something bad happened - npoints is %d", pc->npoints);
1104     }
1105 }
1106
1107 static void
1108 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1109 {
1110     if (!sp_curve_empty(pc->red_curve)) {
1111         sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1112         SPCurve *curve = sp_curve_copy(pc->red_curve);
1113         /// \todo fixme:
1114         SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1115         sp_curve_unref(curve);
1116         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1117
1118         pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1119
1120         pc->p[0] = pc->p[3];
1121         pc->p[1] = pc->p[4];
1122         pc->npoints = 2;
1123
1124         sp_curve_reset(pc->red_curve);
1125     }
1126 }
1127
1128 static void
1129 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1130 {
1131     SPDesktop *const desktop = pc->desktop;
1132     pc->_message_context->clear();
1133     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1134
1135     sp_curve_reset(pc->red_curve);
1136     spdc_concat_colors_and_flush(pc, closed);
1137     pc->sa = NULL;
1138     pc->ea = NULL;
1139
1140     pc->npoints = 0;
1141     pc->state = SP_PEN_CONTEXT_POINT;
1142
1143     sp_canvas_item_hide(pc->c0);
1144     sp_canvas_item_hide(pc->c1);
1145     sp_canvas_item_hide(pc->cl0);
1146     sp_canvas_item_hide(pc->cl1);
1147
1148     if (pc->green_anchor) {
1149         pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1150     }
1151 }
1152
1153
1154 /*
1155   Local Variables:
1156   mode:c++
1157   c-file-style:"stroustrup"
1158   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1159   indent-tabs-mode:nil
1160   fill-column:99
1161   End:
1162 */
1163 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :