src/draw-context.cpp

   1 #define __SP_DRAW_CONTEXT_C__
   2
   3 /*
   4  * Generic drawing context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *
   9  * Copyright (C) 2000 Lauris Kaplinski
  10  * Copyright (C) 2000-2001 Ximian, Inc.
  11  * Copyright (C) 2002 Lauris Kaplinski
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #define DRAW_VERBOSE
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include "config.h"
  20 #endif
  21 #include <gdk/gdkkeysyms.h>
  22
  23 #include "display/canvas-bpath.h"
  24 #include "xml/repr.h"
  25 #include "svg/svg.h"
  26 #include <glibmm/i18n.h>
  27 #include "display/curve.h"
  28 #include "desktop.h"
  29 #include "desktop-affine.h"
  30 #include "desktop-handles.h"
  31 #include "desktop-style.h"
  32 #include "document.h"
  33 #include "draw-anchor.h"
  34 #include "macros.h"
  35 #include "message-stack.h"
  36 #include "pen-context.h"
  37 #include "prefs-utils.h"
  38 #include "selection.h"
  39 #include "selection-chemistry.h"
  40 #include "snap.h"
  41 #include "sp-path.h"
  42 #include "sp-namedview.h"
  43 #include "live_effects/lpe-patternalongpath.h"
  44 #include "style.h"
  45
  46 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  47 static void sp_draw_context_init(SPDrawContext *dc);
  48 static void sp_draw_context_dispose(GObject *object);
  49
  50 static void sp_draw_context_setup(SPEventContext *ec);
  51 static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value);
  52 static void sp_draw_context_finish(SPEventContext *ec);
  53
  54 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  55
  56 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  57 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  58
  59 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  60
  61 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  62
  63 static void spdc_reset_white(SPDrawContext *dc);
  64 static void spdc_free_colors(SPDrawContext *dc);
  65
  66
  67 static SPEventContextClass *draw_parent_class;
  68
  69
  70 GType
  71 sp_draw_context_get_type(void)
  72 {
  73     static GType type = 0;
  74     if (!type) {
  75         GTypeInfo info = {
  76             sizeof(SPDrawContextClass),
  77             NULL, NULL,
  78             (GClassInitFunc) sp_draw_context_class_init,
  79             NULL, NULL,
  80             sizeof(SPDrawContext),
  81             4,
  82             (GInstanceInitFunc) sp_draw_context_init,
  83             NULL,   /* value_table */
  84         };
  85         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  86     }
  87     return type;
  88 }
  89
  90 static void
  91 sp_draw_context_class_init(SPDrawContextClass *klass)
  92 {
  93     GObjectClass *object_class;
  94     SPEventContextClass *ec_class;
  95
  96     object_class = (GObjectClass *)klass;
  97     ec_class = (SPEventContextClass *) klass;
  98
  99     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 100
 101     object_class->dispose = sp_draw_context_dispose;
 102
 103     ec_class->setup = sp_draw_context_setup;
 104     ec_class->set = sp_draw_context_set;
 105     ec_class->finish = sp_draw_context_finish;
 106     ec_class->root_handler = sp_draw_context_root_handler;
 107 }
 108
 109 static void
 110 sp_draw_context_init(SPDrawContext *dc)
 111 {
 112     dc->attach = FALSE;
 113
 114     dc->red_color = 0xff00007f;
 115     dc->blue_color = 0x0000ff7f;
 116     dc->green_color = 0x00ff007f;
 117     dc->red_curve_is_valid = false;
 118
 119     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 120
 121     new (&dc->sel_changed_connection) sigc::connection();
 122     new (&dc->sel_modified_connection) sigc::connection();
 123 }
 124
 125 static void
 126 sp_draw_context_dispose(GObject *object)
 127 {
 128     SPDrawContext *dc = SP_DRAW_CONTEXT(object);
 129
 130     dc->sel_changed_connection.~connection();
 131     dc->sel_modified_connection.~connection();
 132
 133     if (dc->grab) {
 134         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 135         dc->grab = NULL;
 136     }
 137
 138     if (dc->selection) {
 139         dc->selection = NULL;
 140     }
 141
 142     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 143
 144     spdc_free_colors(dc);
 145
 146     G_OBJECT_CLASS(draw_parent_class)->dispose(object);
 147 }
 148
 149 static void
 150 sp_draw_context_setup(SPEventContext *ec)
 151 {
 152     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 153     SPDesktop *dt = ec->desktop;
 154
 155     if (((SPEventContextClass *) draw_parent_class)->setup) {
 156         ((SPEventContextClass *) draw_parent_class)->setup(ec);
 157     }
 158
 159     dc->selection = sp_desktop_selection(dt);
 160
 161     /* Connect signals to track selection changes */
 162     dc->sel_changed_connection = dc->selection->connectChanged(
 163         sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc)
 164     );
 165     dc->sel_modified_connection = dc->selection->connectModified(
 166         sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc)
 167     );
 168
 169     /* Create red bpath */
 170     dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 171     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 172     /* Create red curve */
 173     dc->red_curve = new SPCurve();
 174
 175     /* Create blue bpath */
 176     dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 177     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 178     /* Create blue curve */
 179     dc->blue_curve = new SPCurve();
 180
 181     /* Create green curve */
 182     dc->green_curve = new SPCurve();
 183     /* No green anchor by default */
 184     dc->green_anchor = NULL;
 185     dc->green_closed = FALSE;
 186
 187     dc->attach = TRUE;
 188     spdc_attach_selection(dc, dc->selection);
 189 }
 190
 191 static void
 192 sp_draw_context_finish(SPEventContext *ec)
 193 {
 194     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 195
 196     dc->sel_changed_connection.disconnect();
 197     dc->sel_modified_connection.disconnect();
 198
 199     if (dc->grab) {
 200         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 201     }
 202
 203     if (dc->selection) {
 204         dc->selection = NULL;
 205     }
 206
 207     spdc_free_colors(dc);
 208 }
 209
 210 static void
 211 sp_draw_context_set(SPEventContext */*ec*/, const gchar */*key*/, const gchar */*value*/)
 212 {
 213 }
 214
 215 gint
 216 sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event)
 217 {
 218     gint ret = FALSE;
 219
 220     switch (event->type) {
 221         case GDK_KEY_PRESS:
 222             switch (get_group0_keyval (&event->key)) {
 223                 case GDK_Up:
 224                 case GDK_Down:
 225                 case GDK_KP_Up:
 226                 case GDK_KP_Down:
 227                     // prevent the zoom field from activation
 228                     if (!MOD__CTRL_ONLY) {
 229                         ret = TRUE;
 230                     }
 231                     break;
 232                 default:
 233             break;
 234         }
 235         break;
 236     default:
 237         break;
 238     }
 239
 240     if (!ret) {
 241         if (((SPEventContextClass *) draw_parent_class)->root_handler) {
 242             ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event);
 243         }
 244     }
 245
 246     return ret;
 247 }
 248
 249 static char const *
 250 tool_name(SPDrawContext *dc)
 251 {
 252     return ( SP_IS_PEN_CONTEXT(dc)
 253              ? "tools.freehand.pen"
 254              : "tools.freehand.pencil" );
 255 }
 256
 257 static void
 258 spdc_paste_curve_as_freehand_shape(const SPCurve *c, SPDrawContext *dc, SPItem *item)
 259 {
 260     using namespace Inkscape::LivePathEffect;
 261
 262     // TODO: Don't paste path if nothing is on the clipboard
 263
 264     Effect::createAndApply(Inkscape::LivePathEffect::FREEHAND_SHAPE, dc->desktop->doc(), item);
 265     Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 266     gchar *svgd = sp_svg_write_path(c->get_pathvector());
 267     static_cast<LPEPatternAlongPath*>(lpe)->pattern.paste_param_path(svgd);
 268 }
 269
 270 /*
 271  * If we have an item and a waiting LPE, apply the effect to the item
 272  * (spiro spline mode is treated separately)
 273  */
 274 void
 275 spdc_check_for_and_apply_waiting_LPE(SPDrawContext *dc, SPItem *item)
 276 {
 277     using namespace Inkscape::LivePathEffect;
 278
 279     if (item && SP_IS_LPE_ITEM(item)) {
 280         if (prefs_get_int_attribute(tool_name(dc), "freehand-mode", 0) == 1) {
 281             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 282         }
 283
 284         int shape = prefs_get_int_attribute(tool_name(dc), "shape", 0);
 285         bool shape_applied = false;
 286         SPCSSAttr *css_item = sp_css_attr_from_object (SP_OBJECT(item), SP_STYLE_FLAG_ALWAYS);
 287         const char *cstroke = sp_repr_css_property(css_item, "stroke", "none");
 288
 289 #define SHAPE_LENGTH 100
 290 #define SHAPE_HEIGHT 10
 291
 292         switch (shape) {
 293             case 0:
 294                 // don't apply any shape
 295                 break;
 296             case 1:
 297             {
 298                 // "triangle in"
 299                 // TODO: this is only for illustration (we create a "decrescendo"-shaped path
 300                 //       manually; eventually we should read the path from a separate file)
 301                 SPCurve *c = new SPCurve();
 302                 c->moveto(0,0);
 303                 c->lineto(0, SHAPE_HEIGHT);
 304                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT/2);
 305                 c->closepath();
 306                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 307                 c->unref();
 308
 309                 shape_applied = true;
 310                 break;
 311             }
 312             case 2:
 313             {
 314                 // "triangle out"
 315                 SPCurve *c = new SPCurve();
 316                 c->moveto(0, SHAPE_HEIGHT/2);
 317                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT);
 318                 c->lineto(SHAPE_LENGTH, 0);
 319                 c->closepath();
 320                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 321                 c->unref();
 322
 323                 shape_applied = true;
 324                 break;
 325             }
 326             case 3:
 327             {
 328                 // "ellipse"
 329                 SPCurve *c = new SPCurve();
 330                 const double C1 = 0.552;
 331                 c->moveto(0, SHAPE_HEIGHT/2);
 332                 c->curveto(0, (1 - C1) * SHAPE_HEIGHT/2, (1 - C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH/2, 0);
 333                 c->curveto((1 + C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH, (1 - C1) * SHAPE_HEIGHT/2, SHAPE_LENGTH, SHAPE_HEIGHT/2);
 334                 c->curveto(SHAPE_LENGTH, (1 + C1) * SHAPE_HEIGHT/2, (1 + C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, SHAPE_LENGTH/2, SHAPE_HEIGHT);
 335                 c->curveto((1 - C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, 0, (1 + C1) * SHAPE_HEIGHT/2, 0, SHAPE_HEIGHT/2);
 336                 c->closepath();
 337                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 338                 c->unref();
 339                 shape_applied = true;
 340                 break;
 341             }
 342             case 4:
 343             {
 344                 // take shape from clipboard; TODO: catch the case where clipboard is empty
 345                 Effect::createAndApply(FREEHAND_SHAPE, dc->desktop->doc(), item);
 346                 Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 347                 static_cast<LPEPatternAlongPath*>(lpe)->pattern.on_paste_button_click();
 348
 349                 shape_applied = true;
 350                 break;
 351             }
 352             default:
 353                 break;
 354         }
 355         if (shape_applied) {
 356             // apply original stroke color as fill and unset stroke; then return
 357             SPCSSAttr *css = sp_repr_css_attr_new();
 358             sp_repr_css_set_property (css, "fill", cstroke);
 359             sp_repr_css_set_property (css, "stroke", "none");
 360             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 361             sp_repr_css_attr_unref(css);
 362             return;
 363         }
 364
 365         if (dc->waiting_LPE_type != INVALID_LPE) {
 366             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 367             dc->waiting_LPE_type = INVALID_LPE;
 368         }
 369         if (SP_IS_PEN_CONTEXT(dc)) {
 370             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 371         }
 372     }
 373 }
 374
 375 /*
 376  * Selection handlers
 377  */
 378
 379 static void
 380 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 381 {
 382     if (dc->attach) {
 383         spdc_attach_selection(dc, sel);
 384     }
 385 }
 386
 387 /* fixme: We have to ensure this is not delayed (Lauris) */
 388
 389 static void
 390 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 391 {
 392     if (dc->attach) {
 393         spdc_attach_selection(dc, sel);
 394     }
 395 }
 396
 397 static void
 398 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 399 {
 400     /* We reset white and forget white/start/end anchors */
 401     spdc_reset_white(dc);
 402     dc->sa = NULL;
 403     dc->ea = NULL;
 404
 405     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 406
 407     if ( item && SP_IS_PATH(item) ) {
 408         /* Create new white data */
 409         /* Item */
 410         dc->white_item = item;
 411         /* Curve list */
 412         /* We keep it in desktop coordinates to eliminate calculation errors */
 413         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 414         norm->transform(sp_item_i2d_affine(dc->white_item));
 415         g_return_if_fail( norm != NULL );
 416         dc->white_curves = g_slist_reverse(norm->split());
 417         norm->unref();
 418         /* Anchor list */
 419         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 420             SPCurve *c;
 421             c = (SPCurve*)l->data;
 422             g_return_if_fail( c->get_segment_count() > 0 );
 423             if ( !c->is_closed() ) {
 424                 SPDrawAnchor *a;
 425                 a = sp_draw_anchor_new(dc, c, TRUE, c->first_point());
 426                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 427                 a = sp_draw_anchor_new(dc, c, FALSE, c->last_point());
 428                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 429             }
 430         }
 431         /* fixme: recalculate active anchor? */
 432     }
 433 }
 434
 435
 436 /**
 437  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 438  *
 439  *  \param dc draw context
 440  *  \param p cursor point (to be changed by snapping)
 441  *  \param o origin point
 442  *  \param state  keyboard state to check if ctrl was pressed
 443 */
 444
 445 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const &o,
 446                                  guint state)
 447 {
 448     unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 449     /* 0 means no snapping. */
 450
 451     /* mirrored by fabs, so this corresponds to 15 degrees */
 452     NR::Point best; /* best solution */
 453     double bn = NR_HUGE; /* best normal */
 454     double bdot = 0;
 455     NR::Point v = NR::Point(0, 1);
 456     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 457     double const r10 = -r01, r11 = r00;
 458
 459     NR::Point delta = p - o;
 460
 461     for (unsigned i = 0; i < snaps; i++) {
 462         double const ndot = fabs(dot(v,NR::rot90(delta)));
 463         NR::Point t(r00*v[NR::X] + r01*v[NR::Y],
 464                     r10*v[NR::X] + r11*v[NR::Y]);
 465         if (ndot < bn) {
 466             /* I think it is better numerically to use the normal, rather than the dot product
 467              * to assess solutions, but I haven't proven it. */
 468             bn = ndot;
 469             best = v;
 470             bdot = dot(v, delta);
 471         }
 472         v = t;
 473     }
 474
 475     if (fabs(bdot) > 0) {
 476         p = o + bdot * best;
 477
 478         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 479                                          //After all, the user explicitely asked for angular snapping by
 480                                          //pressing CTRL
 481             /* Snap it along best vector */
 482             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 483             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 484             m.constrainedSnapReturnByRef( Inkscape::Snapper::SNAPPOINT_NODE, p, Inkscape::Snapper::ConstraintLine(best));
 485         }
 486     }
 487 }
 488
 489
 490 void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const /*state*/)
 491 {
 492     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 493     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 494     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, p);
 495 }
 496
 497 static SPCurve *
 498 reverse_then_unref(SPCurve *orig)
 499 {
 500     SPCurve *ret = orig->create_reverse();
 501     orig->unref();
 502     return ret;
 503 }
 504
 505 /**
 506  * Concats red, blue and green.
 507  * If any anchors are defined, process these, optionally removing curves from white list
 508  * Invoke _flush_white to write result back to object.
 509  */
 510 void
 511 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 512 {
 513     /* Concat RBG */
 514     SPCurve *c = dc->green_curve;
 515
 516     /* Green */
 517     dc->green_curve = new SPCurve();
 518     while (dc->green_bpaths) {
 519         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 520         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 521     }
 522     /* Blue */
 523     c->append_continuous(dc->blue_curve, 0.0625);
 524     dc->blue_curve->reset();
 525     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 526     /* Red */
 527     if (dc->red_curve_is_valid) {
 528         c->append_continuous(dc->red_curve, 0.0625);
 529     }
 530     dc->red_curve->reset();
 531     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 532
 533     if (c->is_empty()) {
 534         c->unref();
 535         return;
 536     }
 537
 538     /* Step A - test, whether we ended on green anchor */
 539     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 540         // We hit green anchor, closing Green-Blue-Red
 541         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 542         c->closepath_current();
 543         /* Closed path, just flush */
 544         spdc_flush_white(dc, c);
 545         c->unref();
 546         return;
 547     }
 548
 549     /* Step B - both start and end anchored to same curve */
 550     if ( dc->sa && dc->ea
 551          && ( dc->sa->curve == dc->ea->curve )
 552          && ( ( dc->sa != dc->ea )
 553               || dc->sa->curve->is_closed() ) )
 554     {
 555         // We hit bot start and end of single curve, closing paths
 556         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 557         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 558             c = reverse_then_unref(c);
 559         }
 560         dc->sa->curve->append_continuous(c, 0.0625);
 561         c->unref();
 562         dc->sa->curve->closepath_current();
 563         spdc_flush_white(dc, NULL);
 564         return;
 565     }
 566
 567     /* Step C - test start */
 568     if (dc->sa) {
 569         SPCurve *s = dc->sa->curve;
 570         dc->white_curves = g_slist_remove(dc->white_curves, s);
 571         if (dc->sa->start) {
 572             s = reverse_then_unref(s);
 573         }
 574         s->append_continuous(c, 0.0625);
 575         c->unref();
 576         c = s;
 577     } else /* Step D - test end */ if (dc->ea) {
 578         SPCurve *e = dc->ea->curve;
 579         dc->white_curves = g_slist_remove(dc->white_curves, e);
 580         if (!dc->ea->start) {
 581             e = reverse_then_unref(e);
 582         }
 583         c->append_continuous(e, 0.0625);
 584         e->unref();
 585     }
 586
 587
 588     spdc_flush_white(dc, c);
 589
 590     c->unref();
 591 }
 592
 593 /*
 594  * Flushes white curve(s) and additional curve into object
 595  *
 596  * No cleaning of colored curves - this has to be done by caller
 597  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 598  *
 599  */
 600
 601 static void
 602 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 603 {
 604     SPCurve *c;
 605
 606     if (dc->white_curves) {
 607         g_assert(dc->white_item);
 608         c = SPCurve::concat(dc->white_curves);
 609         g_slist_free(dc->white_curves);
 610         dc->white_curves = NULL;
 611         if (gc) {
 612             c->append(gc, FALSE);
 613         }
 614     } else if (gc) {
 615         c = gc;
 616         c->ref();
 617     } else {
 618         return;
 619     }
 620
 621     /* Now we have to go back to item coordinates at last */
 622     c->transform( dc->white_item
 623                             ? sp_item_dt2i_affine(dc->white_item)
 624                             : to_2geom(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) );
 625
 626     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 627     SPDocument *doc = sp_desktop_document(desktop);
 628     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 629
 630     if ( c && !c->is_empty() ) {
 631         /* We actually have something to write */
 632
 633         bool has_lpe = false;
 634         Inkscape::XML::Node *repr;
 635         if (dc->white_item) {
 636             repr = SP_OBJECT_REPR(dc->white_item);
 637             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 638         } else {
 639             repr = xml_doc->createElement("svg:path");
 640             /* Set style */
 641             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false);
 642         }
 643
 644         gchar *str = sp_svg_write_path( c->get_pathvector() );
 645         g_assert( str != NULL );
 646         if (has_lpe)
 647             repr->setAttribute("inkscape:original-d", str);
 648         else
 649             repr->setAttribute("d", str);
 650         g_free(str);
 651
 652         if (!dc->white_item) {
 653             /* Attach repr */
 654             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 655             dc->selection->set(repr);
 656             Inkscape::GC::release(repr);
 657             item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 658             item->updateRepr();
 659         }
 660
 661
 662         // we finished the path; now apply any waiting LPEs or freehand shapes
 663         // FIXME: placing this here seems to cause issues with undo!
 664         spdc_check_for_and_apply_waiting_LPE(dc, dc->selection->singleItem());
 665
 666         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 667                          _("Draw path"));
 668
 669         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 670         // flushed before the selection_modified signal is fired by the previous change, which
 671         // results in the tool losing all of the selected path's curve except that last subpath. To
 672         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 673         // in sync immediately.
 674         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 675     }
 676
 677     c->unref();
 678
 679     /* Flush pending updates */
 680     sp_document_ensure_up_to_date(doc);
 681 }
 682
 683 /**
 684  * Returns FIRST active anchor (the activated one).
 685  */
 686 SPDrawAnchor *
 687 spdc_test_inside(SPDrawContext *dc, NR::Point p)
 688 {
 689     SPDrawAnchor *active = NULL;
 690
 691     /* Test green anchor */
 692     if (dc->green_anchor) {
 693         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 694     }
 695
 696     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 697         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 698         if ( !active && na ) {
 699             active = na;
 700         }
 701     }
 702
 703     return active;
 704 }
 705
 706 static void
 707 spdc_reset_white(SPDrawContext *dc)
 708 {
 709     if (dc->white_item) {
 710         /* We do not hold refcount */
 711         dc->white_item = NULL;
 712     }
 713     while (dc->white_curves) {
 714         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 715         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 716     }
 717     while (dc->white_anchors) {
 718         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 719         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 720     }
 721 }
 722
 723 static void
 724 spdc_free_colors(SPDrawContext *dc)
 725 {
 726     /* Red */
 727     if (dc->red_bpath) {
 728         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 729         dc->red_bpath = NULL;
 730     }
 731     if (dc->red_curve) {
 732         dc->red_curve = dc->red_curve->unref();
 733     }
 734     /* Blue */
 735     if (dc->blue_bpath) {
 736         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 737         dc->blue_bpath = NULL;
 738     }
 739     if (dc->blue_curve) {
 740         dc->blue_curve = dc->blue_curve->unref();
 741     }
 742     /* Green */
 743     while (dc->green_bpaths) {
 744         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 745         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 746     }
 747     if (dc->green_curve) {
 748         dc->green_curve = dc->green_curve->unref();
 749     }
 750     if (dc->green_anchor) {
 751         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 752     }
 753     /* White */
 754     if (dc->white_item) {
 755         /* We do not hold refcount */
 756         dc->white_item = NULL;
 757     }
 758     while (dc->white_curves) {
 759         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 760         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 761     }
 762     while (dc->white_anchors) {
 763         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 764         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 765     }
 766 }
 767
 768
 769 /*
 770   Local Variables:
 771   mode:c++
 772   c-file-style:"stroustrup"
 773   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 774   indent-tabs-mode:nil
 775   fill-column:99
 776   End:
 777 */
 778 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :