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 "libnr/n-art-bpath.h"
  28 #include "display/curve.h"
  29 #include "desktop.h"
  30 #include "desktop-affine.h"
  31 #include "desktop-handles.h"
  32 #include "desktop-style.h"
  33 #include "document.h"
  34 #include "draw-anchor.h"
  35 #include "macros.h"
  36 #include "message-stack.h"
  37 #include "pen-context.h"
  38 #include "prefs-utils.h"
  39 #include "selection.h"
  40 #include "selection-chemistry.h"
  41 #include "snap.h"
  42 #include "sp-path.h"
  43 #include "sp-namedview.h"
  44 #include "live_effects/lpe-patternalongpath.h"
  45 #include "style.h"
  46
  47 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  48 static void sp_draw_context_init(SPDrawContext *dc);
  49 static void sp_draw_context_dispose(GObject *object);
  50
  51 static void sp_draw_context_setup(SPEventContext *ec);
  52 static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value);
  53 static void sp_draw_context_finish(SPEventContext *ec);
  54
  55 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  56
  57 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  58 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  59
  60 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  61
  62 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  63
  64 static void spdc_reset_white(SPDrawContext *dc);
  65 static void spdc_free_colors(SPDrawContext *dc);
  66
  67
  68 static SPEventContextClass *draw_parent_class;
  69
  70
  71 GType
  72 sp_draw_context_get_type(void)
  73 {
  74     static GType type = 0;
  75     if (!type) {
  76         GTypeInfo info = {
  77             sizeof(SPDrawContextClass),
  78             NULL, NULL,
  79             (GClassInitFunc) sp_draw_context_class_init,
  80             NULL, NULL,
  81             sizeof(SPDrawContext),
  82             4,
  83             (GInstanceInitFunc) sp_draw_context_init,
  84             NULL,   /* value_table */
  85         };
  86         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  87     }
  88     return type;
  89 }
  90
  91 static void
  92 sp_draw_context_class_init(SPDrawContextClass *klass)
  93 {
  94     GObjectClass *object_class;
  95     SPEventContextClass *ec_class;
  96
  97     object_class = (GObjectClass *)klass;
  98     ec_class = (SPEventContextClass *) klass;
  99
 100     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 101
 102     object_class->dispose = sp_draw_context_dispose;
 103
 104     ec_class->setup = sp_draw_context_setup;
 105     ec_class->set = sp_draw_context_set;
 106     ec_class->finish = sp_draw_context_finish;
 107     ec_class->root_handler = sp_draw_context_root_handler;
 108 }
 109
 110 static void
 111 sp_draw_context_init(SPDrawContext *dc)
 112 {
 113     dc->attach = FALSE;
 114
 115     dc->red_color = 0xff00007f;
 116     dc->blue_color = 0x0000ff7f;
 117     dc->green_color = 0x00ff007f;
 118     dc->red_curve_is_valid = false;
 119
 120     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 121
 122     new (&dc->sel_changed_connection) sigc::connection();
 123     new (&dc->sel_modified_connection) sigc::connection();
 124 }
 125
 126 static void
 127 sp_draw_context_dispose(GObject *object)
 128 {
 129     SPDrawContext *dc = SP_DRAW_CONTEXT(object);
 130
 131     dc->sel_changed_connection.~connection();
 132     dc->sel_modified_connection.~connection();
 133
 134     if (dc->grab) {
 135         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 136         dc->grab = NULL;
 137     }
 138
 139     if (dc->selection) {
 140         dc->selection = NULL;
 141     }
 142
 143     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 144
 145     spdc_free_colors(dc);
 146
 147     G_OBJECT_CLASS(draw_parent_class)->dispose(object);
 148 }
 149
 150 static void
 151 sp_draw_context_setup(SPEventContext *ec)
 152 {
 153     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 154     SPDesktop *dt = ec->desktop;
 155
 156     if (((SPEventContextClass *) draw_parent_class)->setup) {
 157         ((SPEventContextClass *) draw_parent_class)->setup(ec);
 158     }
 159
 160     dc->selection = sp_desktop_selection(dt);
 161
 162     /* Connect signals to track selection changes */
 163     dc->sel_changed_connection = dc->selection->connectChanged(
 164         sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc)
 165     );
 166     dc->sel_modified_connection = dc->selection->connectModified(
 167         sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc)
 168     );
 169
 170     /* Create red bpath */
 171     dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 172     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 173     /* Create red curve */
 174     dc->red_curve = new SPCurve();
 175
 176     /* Create blue bpath */
 177     dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 178     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 179     /* Create blue curve */
 180     dc->blue_curve = new SPCurve();
 181
 182     /* Create green curve */
 183     dc->green_curve = new SPCurve();
 184     /* No green anchor by default */
 185     dc->green_anchor = NULL;
 186     dc->green_closed = FALSE;
 187
 188     dc->attach = TRUE;
 189     spdc_attach_selection(dc, dc->selection);
 190 }
 191
 192 static void
 193 sp_draw_context_finish(SPEventContext *ec)
 194 {
 195     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 196
 197     dc->sel_changed_connection.disconnect();
 198     dc->sel_modified_connection.disconnect();
 199
 200     if (dc->grab) {
 201         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 202     }
 203
 204     if (dc->selection) {
 205         dc->selection = NULL;
 206     }
 207
 208     spdc_free_colors(dc);
 209 }
 210
 211 static void
 212 sp_draw_context_set(SPEventContext */*ec*/, const gchar */*key*/, const gchar */*value*/)
 213 {
 214 }
 215
 216 gint
 217 sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event)
 218 {
 219     gint ret = FALSE;
 220
 221     switch (event->type) {
 222         case GDK_KEY_PRESS:
 223             switch (get_group0_keyval (&event->key)) {
 224                 case GDK_Up:
 225                 case GDK_Down:
 226                 case GDK_KP_Up:
 227                 case GDK_KP_Down:
 228                     // prevent the zoom field from activation
 229                     if (!MOD__CTRL_ONLY) {
 230                         ret = TRUE;
 231                     }
 232                     break;
 233                 default:
 234             break;
 235         }
 236         break;
 237     default:
 238         break;
 239     }
 240
 241     if (!ret) {
 242         if (((SPEventContextClass *) draw_parent_class)->root_handler) {
 243             ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event);
 244         }
 245     }
 246
 247     return ret;
 248 }
 249
 250 static char const *
 251 tool_name(SPDrawContext *dc)
 252 {
 253     return ( SP_IS_PEN_CONTEXT(dc)
 254              ? "tools.freehand.pen"
 255              : "tools.freehand.pencil" );
 256 }
 257
 258 static void
 259 spdc_paste_curve_as_freehand_shape(const SPCurve *c, SPDrawContext *dc, SPItem *item)
 260 {
 261     using namespace Inkscape::LivePathEffect;
 262
 263     // TODO: Don't paste path if nothing is on the clipboard
 264
 265     Effect::createAndApply(Inkscape::LivePathEffect::FREEHAND_SHAPE, dc->desktop->doc(), item);
 266     Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 267     gchar *svgd = sp_svg_write_path(c->get_pathvector());
 268     static_cast<LPEPatternAlongPath*>(lpe)->pattern.paste_param_path(svgd);
 269 }
 270
 271 /*
 272  * If we have an item and a waiting LPE, apply the effect to the item
 273  * (spiro spline mode is treated separately)
 274  */
 275 void
 276 spdc_check_for_and_apply_waiting_LPE(SPDrawContext *dc, SPItem *item)
 277 {
 278     using namespace Inkscape::LivePathEffect;
 279
 280     if (item && SP_IS_LPE_ITEM(item)) {
 281         if (prefs_get_int_attribute(tool_name(dc), "freehand-mode", 0) == 1) {
 282             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 283         }
 284
 285         int shape = prefs_get_int_attribute(tool_name(dc), "shape", 0);
 286         bool shape_applied = false;
 287         SPCSSAttr *css_item = sp_css_attr_from_object (SP_OBJECT(item), SP_STYLE_FLAG_ALWAYS);
 288         const char *cstroke = sp_repr_css_property(css_item, "stroke", "none");
 289
 290 #define SHAPE_LENGTH 100
 291 #define SHAPE_HEIGHT 10
 292
 293         switch (shape) {
 294             case 0:
 295                 // don't apply any shape
 296                 break;
 297             case 1:
 298             {
 299                 // "triangle in"
 300                 // TODO: this is only for illustration (we create a "decrescendo"-shaped path
 301                 //       manually; eventually we should read the path from a separate file)
 302                 SPCurve *c = new SPCurve();
 303                 c->moveto(0,0);
 304                 c->lineto(0, SHAPE_HEIGHT);
 305                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT/2);
 306                 c->closepath();
 307                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 308                 c->unref();
 309
 310                 shape_applied = true;
 311                 break;
 312             }
 313             case 2:
 314             {
 315                 // "triangle out"
 316                 SPCurve *c = new SPCurve();
 317                 c->moveto(0, SHAPE_HEIGHT/2);
 318                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT);
 319                 c->lineto(SHAPE_LENGTH, 0);
 320                 c->closepath();
 321                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 322                 c->unref();
 323
 324                 shape_applied = true;
 325                 break;
 326             }
 327             case 3:
 328             {
 329                 // "ellipse"
 330                 SPCurve *c = new SPCurve();
 331                 const double C1 = 0.552;
 332                 c->moveto(0, SHAPE_HEIGHT/2);
 333                 c->curveto(0, (1 - C1) * SHAPE_HEIGHT/2, (1 - C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH/2, 0);
 334                 c->curveto((1 + C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH, (1 - C1) * SHAPE_HEIGHT/2, SHAPE_LENGTH, SHAPE_HEIGHT/2);
 335                 c->curveto(SHAPE_LENGTH, (1 + C1) * SHAPE_HEIGHT/2, (1 + C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, SHAPE_LENGTH/2, SHAPE_HEIGHT);
 336                 c->curveto((1 - C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, 0, (1 + C1) * SHAPE_HEIGHT/2, 0, SHAPE_HEIGHT/2);
 337                 c->closepath();
 338                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 339                 c->unref();
 340                 shape_applied = true;
 341                 break;
 342             }
 343             case 4:
 344             {
 345                 // take shape from clipboard; TODO: catch the case where clipboard is empty
 346                 Effect::createAndApply(FREEHAND_SHAPE, dc->desktop->doc(), item);
 347                 Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 348                 static_cast<LPEPatternAlongPath*>(lpe)->pattern.on_paste_button_click();
 349
 350                 shape_applied = true;
 351                 break;
 352             }
 353             default:
 354                 break;
 355         }
 356         if (shape_applied) {
 357             // apply original stroke color as fill and unset stroke; then return
 358             SPCSSAttr *css = sp_repr_css_attr_new();
 359             sp_repr_css_set_property (css, "fill", cstroke);
 360             sp_repr_css_set_property (css, "stroke", "none");
 361             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 362             sp_repr_css_attr_unref(css);
 363             return;
 364         }
 365
 366         if (dc->waiting_LPE_type != INVALID_LPE) {
 367             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 368             dc->waiting_LPE_type = INVALID_LPE;
 369         }
 370         if (SP_IS_PEN_CONTEXT(dc)) {
 371             SP_PEN_CONTEXT(dc)->polylines_only = (prefs_get_int_attribute("tools.freehand.pen", "freehand-mode", 0) == 2);
 372         }
 373     }
 374 }
 375
 376 /*
 377  * Selection handlers
 378  */
 379
 380 static void
 381 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 382 {
 383     if (dc->attach) {
 384         spdc_attach_selection(dc, sel);
 385     }
 386 }
 387
 388 /* fixme: We have to ensure this is not delayed (Lauris) */
 389
 390 static void
 391 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 392 {
 393     if (dc->attach) {
 394         spdc_attach_selection(dc, sel);
 395     }
 396 }
 397
 398 static void
 399 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 400 {
 401     /* We reset white and forget white/start/end anchors */
 402     spdc_reset_white(dc);
 403     dc->sa = NULL;
 404     dc->ea = NULL;
 405
 406     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 407
 408     if ( item && SP_IS_PATH(item) ) {
 409         /* Create new white data */
 410         /* Item */
 411         dc->white_item = item;
 412         /* Curve list */
 413         /* We keep it in desktop coordinates to eliminate calculation errors */
 414         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 415         norm->transform(sp_item_i2d_affine(dc->white_item));
 416         g_return_if_fail( norm != NULL );
 417         dc->white_curves = g_slist_reverse(norm->split());
 418         norm->unref();
 419         /* Anchor list */
 420         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 421             SPCurve *c;
 422             c = (SPCurve*)l->data;
 423             g_return_if_fail( c->get_segment_count() > 0 );
 424             if ( !c->is_closed() ) {
 425                 SPDrawAnchor *a;
 426                 a = sp_draw_anchor_new(dc, c, TRUE, c->first_point());
 427                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 428                 a = sp_draw_anchor_new(dc, c, FALSE, c->last_point());
 429                 dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 430             }
 431         }
 432         /* fixme: recalculate active anchor? */
 433     }
 434 }
 435
 436
 437 /**
 438  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 439  *
 440  *  \param dc draw context
 441  *  \param p cursor point (to be changed by snapping)
 442  *  \param o origin point
 443  *  \param state  keyboard state to check if ctrl was pressed
 444 */
 445
 446 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const o,
 447                                  guint state)
 448 {
 449     /* Control must be down for this snap to work */
 450     if ((state & GDK_CONTROL_MASK) == 0) {
 451         return;
 452     }
 453
 454     unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 455     /* 0 means no snapping. */
 456
 457     /* mirrored by fabs, so this corresponds to 15 degrees */
 458     NR::Point best; /* best solution */
 459     double bn = NR_HUGE; /* best normal */
 460     double bdot = 0;
 461     NR::Point v = NR::Point(0, 1);
 462     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 463     double const r10 = -r01, r11 = r00;
 464
 465     NR::Point delta = p - o;
 466
 467     for (unsigned i = 0; i < snaps; i++) {
 468         double const ndot = fabs(dot(v,NR::rot90(delta)));
 469         NR::Point t(r00*v[NR::X] + r01*v[NR::Y],
 470                     r10*v[NR::X] + r11*v[NR::Y]);
 471         if (ndot < bn) {
 472             /* I think it is better numerically to use the normal, rather than the dot product
 473              * to assess solutions, but I haven't proven it. */
 474             bn = ndot;
 475             best = v;
 476             bdot = dot(v, delta);
 477         }
 478         v = t;
 479     }
 480
 481     if (fabs(bdot) > 0) {
 482         p = o + bdot * best;
 483
 484         /* Snap it along best vector */
 485         SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 486         m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 487         m.constrainedSnapReturnByRef( Inkscape::Snapper::SNAPPOINT_NODE, p, Inkscape::Snapper::ConstraintLine(best));
 488     }
 489 }
 490
 491
 492 void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const state)
 493 {
 494     /* Shift disables this snap */
 495     if (state & GDK_SHIFT_MASK) {
 496         return;
 497     }
 498
 499     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 500     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 501     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, p);
 502 }
 503
 504 static SPCurve *
 505 reverse_then_unref(SPCurve *orig)
 506 {
 507     SPCurve *ret = orig->create_reverse();
 508     orig->unref();
 509     return ret;
 510 }
 511
 512 /**
 513  * Concats red, blue and green.
 514  * If any anchors are defined, process these, optionally removing curves from white list
 515  * Invoke _flush_white to write result back to object.
 516  */
 517 void
 518 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 519 {
 520     /* Concat RBG */
 521     SPCurve *c = dc->green_curve;
 522
 523     /* Green */
 524     dc->green_curve = new SPCurve();
 525     while (dc->green_bpaths) {
 526         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 527         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 528     }
 529     /* Blue */
 530     c->append_continuous(dc->blue_curve, 0.0625);
 531     dc->blue_curve->reset();
 532     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 533     /* Red */
 534     if (dc->red_curve_is_valid) {
 535         c->append_continuous(dc->red_curve, 0.0625);
 536     }
 537     dc->red_curve->reset();
 538     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 539
 540     if (c->is_empty()) {
 541         c->unref();
 542         return;
 543     }
 544
 545     /* Step A - test, whether we ended on green anchor */
 546     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 547         // We hit green anchor, closing Green-Blue-Red
 548         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 549         c->closepath_current();
 550         /* Closed path, just flush */
 551         spdc_flush_white(dc, c);
 552         c->unref();
 553         return;
 554     }
 555
 556     /* Step B - both start and end anchored to same curve */
 557     if ( dc->sa && dc->ea
 558          && ( dc->sa->curve == dc->ea->curve )
 559          && ( ( dc->sa != dc->ea )
 560               || dc->sa->curve->is_closed() ) )
 561     {
 562         // We hit bot start and end of single curve, closing paths
 563         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 564         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 565             c = reverse_then_unref(c);
 566         }
 567         dc->sa->curve->append_continuous(c, 0.0625);
 568         c->unref();
 569         dc->sa->curve->closepath_current();
 570         spdc_flush_white(dc, NULL);
 571         return;
 572     }
 573
 574     /* Step C - test start */
 575     if (dc->sa) {
 576         SPCurve *s = dc->sa->curve;
 577         dc->white_curves = g_slist_remove(dc->white_curves, s);
 578         if (dc->sa->start) {
 579             s = reverse_then_unref(s);
 580         }
 581         s->append_continuous(c, 0.0625);
 582         c->unref();
 583         c = s;
 584     } else /* Step D - test end */ if (dc->ea) {
 585         SPCurve *e = dc->ea->curve;
 586         dc->white_curves = g_slist_remove(dc->white_curves, e);
 587         if (!dc->ea->start) {
 588             e = reverse_then_unref(e);
 589         }
 590         c->append_continuous(e, 0.0625);
 591         e->unref();
 592     }
 593
 594
 595     spdc_flush_white(dc, c);
 596
 597     c->unref();
 598 }
 599
 600 /*
 601  * Flushes white curve(s) and additional curve into object
 602  *
 603  * No cleaning of colored curves - this has to be done by caller
 604  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 605  *
 606  */
 607
 608 static void
 609 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 610 {
 611     SPCurve *c;
 612
 613     if (dc->white_curves) {
 614         g_assert(dc->white_item);
 615         c = SPCurve::concat(dc->white_curves);
 616         g_slist_free(dc->white_curves);
 617         dc->white_curves = NULL;
 618         if (gc) {
 619             c->append(gc, FALSE);
 620         }
 621     } else if (gc) {
 622         c = gc;
 623         c->ref();
 624     } else {
 625         return;
 626     }
 627
 628     /* Now we have to go back to item coordinates at last */
 629     c->transform(( dc->white_item
 630                             ? sp_item_dt2i_affine(dc->white_item)
 631                             : to_2geom(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) ));
 632
 633     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 634     SPDocument *doc = sp_desktop_document(desktop);
 635     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 636
 637     if ( c && !c->is_empty() ) {
 638         /* We actually have something to write */
 639
 640         bool has_lpe = false;
 641         Inkscape::XML::Node *repr;
 642         if (dc->white_item) {
 643             repr = SP_OBJECT_REPR(dc->white_item);
 644             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 645         } else {
 646             repr = xml_doc->createElement("svg:path");
 647             /* Set style */
 648             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false);
 649         }
 650
 651         gchar *str = sp_svg_write_path( c->get_pathvector() );
 652         g_assert( str != NULL );
 653         if (has_lpe)
 654             repr->setAttribute("inkscape:original-d", str);
 655         else
 656             repr->setAttribute("d", str);
 657         g_free(str);
 658
 659         if (!dc->white_item) {
 660             /* Attach repr */
 661             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 662             dc->selection->set(repr);
 663             Inkscape::GC::release(repr);
 664             item->transform = from_2geom(i2i_affine(desktop->currentRoot(), desktop->currentLayer()));
 665             item->updateRepr();
 666         }
 667
 668
 669         // we finished the path; now apply any waiting LPEs or freehand shapes
 670         // FIXME: placing this here seems to cause issues with undo!
 671         spdc_check_for_and_apply_waiting_LPE(dc, dc->selection->singleItem());
 672
 673         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 674                          _("Draw path"));
 675
 676         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 677         // flushed before the selection_modified signal is fired by the previous change, which
 678         // results in the tool losing all of the selected path's curve except that last subpath. To
 679         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 680         // in sync immediately.
 681         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 682     }
 683
 684     c->unref();
 685
 686     /* Flush pending updates */
 687     sp_document_ensure_up_to_date(doc);
 688 }
 689
 690 /**
 691  * Returns FIRST active anchor (the activated one).
 692  */
 693 SPDrawAnchor *
 694 spdc_test_inside(SPDrawContext *dc, NR::Point p)
 695 {
 696     SPDrawAnchor *active = NULL;
 697
 698     /* Test green anchor */
 699     if (dc->green_anchor) {
 700         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 701     }
 702
 703     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 704         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 705         if ( !active && na ) {
 706             active = na;
 707         }
 708     }
 709
 710     return active;
 711 }
 712
 713 static void
 714 spdc_reset_white(SPDrawContext *dc)
 715 {
 716     if (dc->white_item) {
 717         /* We do not hold refcount */
 718         dc->white_item = NULL;
 719     }
 720     while (dc->white_curves) {
 721         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 722         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 723     }
 724     while (dc->white_anchors) {
 725         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 726         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 727     }
 728 }
 729
 730 static void
 731 spdc_free_colors(SPDrawContext *dc)
 732 {
 733     /* Red */
 734     if (dc->red_bpath) {
 735         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 736         dc->red_bpath = NULL;
 737     }
 738     if (dc->red_curve) {
 739         dc->red_curve = dc->red_curve->unref();
 740     }
 741     /* Blue */
 742     if (dc->blue_bpath) {
 743         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 744         dc->blue_bpath = NULL;
 745     }
 746     if (dc->blue_curve) {
 747         dc->blue_curve = dc->blue_curve->unref();
 748     }
 749     /* Green */
 750     while (dc->green_bpaths) {
 751         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 752         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 753     }
 754     if (dc->green_curve) {
 755         dc->green_curve = dc->green_curve->unref();
 756     }
 757     if (dc->green_anchor) {
 758         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 759     }
 760     /* White */
 761     if (dc->white_item) {
 762         /* We do not hold refcount */
 763         dc->white_item = NULL;
 764     }
 765     while (dc->white_curves) {
 766         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 767         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 768     }
 769     while (dc->white_anchors) {
 770         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 771         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 772     }
 773 }
 774
 775
 776 /*
 777   Local Variables:
 778   mode:c++
 779   c-file-style:"stroustrup"
 780   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 781   indent-tabs-mode:nil
 782   fill-column:99
 783   End:
 784 */
 785 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :