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 "lpe-tool-context.h"
  38 #include "preferences.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, Inkscape::Preferences::Entry *val);
  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->red_bpath = NULL;
 121     dc->red_curve = NULL;
 122
 123     dc->blue_bpath = NULL;
 124     dc->blue_curve = NULL;
 125
 126     dc->green_bpaths = NULL;
 127     dc->green_curve = NULL;
 128     dc->green_anchor = NULL;
 129     dc->green_closed = false;
 130
 131     dc->white_item = NULL;
 132     dc->white_curves = NULL;
 133     dc->white_anchors = NULL;
 134
 135     dc->sa = NULL;
 136     dc->ea = NULL;
 137
 138     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 139
 140     new (&dc->sel_changed_connection) sigc::connection();
 141     new (&dc->sel_modified_connection) sigc::connection();
 142 }
 143
 144 static void
 145 sp_draw_context_dispose(GObject *object)
 146 {
 147     SPDrawContext *dc = SP_DRAW_CONTEXT(object);
 148
 149     dc->sel_changed_connection.~connection();
 150     dc->sel_modified_connection.~connection();
 151
 152     if (dc->grab) {
 153         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 154         dc->grab = NULL;
 155     }
 156
 157     if (dc->selection) {
 158         dc->selection = NULL;
 159     }
 160
 161     spdc_free_colors(dc);
 162
 163     G_OBJECT_CLASS(draw_parent_class)->dispose(object);
 164 }
 165
 166 static void
 167 sp_draw_context_setup(SPEventContext *ec)
 168 {
 169     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 170     SPDesktop *dt = ec->desktop;
 171
 172     if (((SPEventContextClass *) draw_parent_class)->setup) {
 173         ((SPEventContextClass *) draw_parent_class)->setup(ec);
 174     }
 175
 176     dc->selection = sp_desktop_selection(dt);
 177
 178     /* Connect signals to track selection changes */
 179     dc->sel_changed_connection = dc->selection->connectChanged(
 180         sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc)
 181     );
 182     dc->sel_modified_connection = dc->selection->connectModified(
 183         sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc)
 184     );
 185
 186     /* Create red bpath */
 187     dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 188     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 189     /* Create red curve */
 190     dc->red_curve = new SPCurve();
 191
 192     /* Create blue bpath */
 193     dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 194     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 195     /* Create blue curve */
 196     dc->blue_curve = new SPCurve();
 197
 198     /* Create green curve */
 199     dc->green_curve = new SPCurve();
 200     /* No green anchor by default */
 201     dc->green_anchor = NULL;
 202     dc->green_closed = FALSE;
 203
 204     dc->attach = TRUE;
 205     spdc_attach_selection(dc, dc->selection);
 206 }
 207
 208 static void
 209 sp_draw_context_finish(SPEventContext *ec)
 210 {
 211     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 212
 213     dc->sel_changed_connection.disconnect();
 214     dc->sel_modified_connection.disconnect();
 215
 216     if (dc->grab) {
 217         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 218     }
 219
 220     if (dc->selection) {
 221         dc->selection = NULL;
 222     }
 223
 224     spdc_free_colors(dc);
 225 }
 226
 227 static void
 228 sp_draw_context_set(SPEventContext */*ec*/, Inkscape::Preferences::Entry */*val*/)
 229 {
 230 }
 231
 232 gint
 233 sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event)
 234 {
 235     gint ret = FALSE;
 236
 237     switch (event->type) {
 238         case GDK_KEY_PRESS:
 239             switch (get_group0_keyval (&event->key)) {
 240                 case GDK_Up:
 241                 case GDK_Down:
 242                 case GDK_KP_Up:
 243                 case GDK_KP_Down:
 244                     // prevent the zoom field from activation
 245                     if (!MOD__CTRL_ONLY) {
 246                         ret = TRUE;
 247                     }
 248                     break;
 249                 default:
 250             break;
 251         }
 252         break;
 253     default:
 254         break;
 255     }
 256
 257     if (!ret) {
 258         if (((SPEventContextClass *) draw_parent_class)->root_handler) {
 259             ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event);
 260         }
 261     }
 262
 263     return ret;
 264 }
 265
 266 static Glib::ustring const
 267 tool_name(SPDrawContext *dc)
 268 {
 269     return ( SP_IS_PEN_CONTEXT(dc)
 270              ? "/tools/freehand/pen"
 271              : "/tools/freehand/pencil" );
 272 }
 273
 274 static void
 275 spdc_paste_curve_as_freehand_shape(const SPCurve *c, SPDrawContext *dc, SPItem *item)
 276 {
 277     using namespace Inkscape::LivePathEffect;
 278
 279     // TODO: Don't paste path if nothing is on the clipboard
 280
 281     Effect::createAndApply(PATTERN_ALONG_PATH, dc->desktop->doc(), item);
 282     Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 283     gchar *svgd = sp_svg_write_path(c->get_pathvector());
 284     static_cast<LPEPatternAlongPath*>(lpe)->pattern.paste_param_path(svgd);
 285 }
 286
 287 /*
 288  * If we have an item and a waiting LPE, apply the effect to the item
 289  * (spiro spline mode is treated separately)
 290  */
 291 void
 292 spdc_check_for_and_apply_waiting_LPE(SPDrawContext *dc, SPItem *item)
 293 {
 294     using namespace Inkscape::LivePathEffect;
 295     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 296
 297     if (item && SP_IS_LPE_ITEM(item)) {
 298         if (prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 1) {
 299             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 300         }
 301
 302         int shape = prefs->getInt(tool_name(dc) + "/shape", 0);
 303         bool shape_applied = false;
 304         SPCSSAttr *css_item = sp_css_attr_from_object (SP_OBJECT(item), SP_STYLE_FLAG_ALWAYS);
 305         const char *cstroke = sp_repr_css_property(css_item, "stroke", "none");
 306
 307 #define SHAPE_LENGTH 100
 308 #define SHAPE_HEIGHT 10
 309
 310         switch (shape) {
 311             case 0:
 312                 // don't apply any shape
 313                 break;
 314             case 1:
 315             {
 316                 // "triangle in"
 317                 // TODO: this is only for illustration (we create a "decrescendo"-shaped path
 318                 //       manually; eventually we should read the path from a separate file)
 319                 SPCurve *c = new SPCurve();
 320                 c->moveto(0,0);
 321                 c->lineto(0, SHAPE_HEIGHT);
 322                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT/2);
 323                 c->closepath();
 324                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 325                 c->unref();
 326
 327                 shape_applied = true;
 328                 break;
 329             }
 330             case 2:
 331             {
 332                 // "triangle out"
 333                 SPCurve *c = new SPCurve();
 334                 c->moveto(0, SHAPE_HEIGHT/2);
 335                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT);
 336                 c->lineto(SHAPE_LENGTH, 0);
 337                 c->closepath();
 338                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 339                 c->unref();
 340
 341                 shape_applied = true;
 342                 break;
 343             }
 344             case 3:
 345             {
 346                 // "ellipse"
 347                 SPCurve *c = new SPCurve();
 348                 const double C1 = 0.552;
 349                 c->moveto(0, SHAPE_HEIGHT/2);
 350                 c->curveto(0, (1 - C1) * SHAPE_HEIGHT/2, (1 - C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH/2, 0);
 351                 c->curveto((1 + C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH, (1 - C1) * SHAPE_HEIGHT/2, SHAPE_LENGTH, SHAPE_HEIGHT/2);
 352                 c->curveto(SHAPE_LENGTH, (1 + C1) * SHAPE_HEIGHT/2, (1 + C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, SHAPE_LENGTH/2, SHAPE_HEIGHT);
 353                 c->curveto((1 - C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, 0, (1 + C1) * SHAPE_HEIGHT/2, 0, SHAPE_HEIGHT/2);
 354                 c->closepath();
 355                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 356                 c->unref();
 357                 shape_applied = true;
 358                 break;
 359             }
 360             case 4:
 361             {
 362                 // take shape from clipboard; TODO: catch the case where clipboard is empty
 363                 Effect::createAndApply(FREEHAND_SHAPE, dc->desktop->doc(), item);
 364                 Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 365                 static_cast<LPEPatternAlongPath*>(lpe)->pattern.on_paste_button_click();
 366
 367                 shape_applied = true;
 368                 break;
 369             }
 370             default:
 371                 break;
 372         }
 373         if (shape_applied) {
 374             // apply original stroke color as fill and unset stroke; then return
 375             SPCSSAttr *css = sp_repr_css_attr_new();
 376
 377             if (!strcmp(cstroke, "none")){
 378                 sp_repr_css_set_property (css, "fill", "black");
 379             } else {
 380                 sp_repr_css_set_property (css, "fill", cstroke);
 381             }
 382             sp_repr_css_set_property (css, "stroke", "none");
 383             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 384             sp_repr_css_attr_unref(css);
 385             return;
 386         }
 387
 388         if (dc->waiting_LPE_type != INVALID_LPE) {
 389             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 390             dc->waiting_LPE_type = INVALID_LPE;
 391
 392             if (SP_IS_LPETOOL_CONTEXT(dc)) {
 393                 // since a geometric LPE was applied, we switch back to "inactive" mode
 394                 lpetool_context_switch_mode(SP_LPETOOL_CONTEXT(dc), INVALID_LPE);
 395             }
 396         }
 397         if (SP_IS_PEN_CONTEXT(dc)) {
 398             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 399         }
 400     }
 401 }
 402
 403 /*
 404  * Selection handlers
 405  */
 406
 407 static void
 408 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 409 {
 410     if (dc->attach) {
 411         spdc_attach_selection(dc, sel);
 412     }
 413 }
 414
 415 /* fixme: We have to ensure this is not delayed (Lauris) */
 416
 417 static void
 418 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 419 {
 420     if (dc->attach) {
 421         spdc_attach_selection(dc, sel);
 422     }
 423 }
 424
 425 static void
 426 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 427 {
 428     /* We reset white and forget white/start/end anchors */
 429     spdc_reset_white(dc);
 430     dc->sa = NULL;
 431     dc->ea = NULL;
 432
 433     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 434
 435     if ( item && SP_IS_PATH(item) ) {
 436         /* Create new white data */
 437         /* Item */
 438         dc->white_item = item;
 439         /* Curve list */
 440         /* We keep it in desktop coordinates to eliminate calculation errors */
 441         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 442         norm->transform(sp_item_i2d_affine(dc->white_item));
 443         g_return_if_fail( norm != NULL );
 444         dc->white_curves = g_slist_reverse(norm->split());
 445         norm->unref();
 446         /* Anchor list */
 447         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 448             SPCurve *c;
 449             c = (SPCurve*)l->data;
 450             g_return_if_fail( c->get_segment_count() > 0 );
 451             if ( !c->is_closed() ) {
 452                 SPDrawAnchor *a;
 453                 a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
 454                 if (a)
 455                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 456                 a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
 457                 if (a)
 458                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 459             }
 460         }
 461         /* fixme: recalculate active anchor? */
 462     }
 463 }
 464
 465
 466 /**
 467  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 468  *
 469  *  \param dc draw context
 470  *  \param p cursor point (to be changed by snapping)
 471  *  \param o origin point
 472  *  \param state  keyboard state to check if ctrl was pressed
 473 */
 474
 475 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, Geom::Point &p, Geom::Point const &o,
 476                                  guint state)
 477 {
 478     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 479     unsigned const snaps = abs(prefs->getInt("/options/rotationsnapsperpi/value", 12));
 480     /* 0 means no snapping. */
 481
 482     /* mirrored by fabs, so this corresponds to 15 degrees */
 483     Geom::Point best; /* best solution */
 484     double bn = NR_HUGE; /* best normal */
 485     double bdot = 0;
 486     Geom::Point v = Geom::Point(0, 1);
 487     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 488     double const r10 = -r01, r11 = r00;
 489
 490     Geom::Point delta = p - o;
 491
 492     for (unsigned i = 0; i < snaps; i++) {
 493         double const ndot = fabs(dot(v,Geom::rot90(delta)));
 494         Geom::Point t(r00*v[Geom::X] + r01*v[Geom::Y],
 495                     r10*v[Geom::X] + r11*v[Geom::Y]);
 496         if (ndot < bn) {
 497             /* I think it is better numerically to use the normal, rather than the dot product
 498              * to assess solutions, but I haven't proven it. */
 499             bn = ndot;
 500             best = v;
 501             bdot = dot(v, delta);
 502         }
 503         v = t;
 504     }
 505
 506     if (fabs(bdot) > 0) {
 507         p = o + bdot * best;
 508
 509         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 510                                          //After all, the user explicitely asked for angular snapping by
 511                                          //pressing CTRL
 512             /* Snap it along best vector */
 513             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 514             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 515             Geom::Point pt2g = to_2geom(p);
 516             m.constrainedSnapReturnByRef( Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::Snapper::ConstraintLine(best));
 517             p = from_2geom(pt2g);
 518         }
 519     }
 520 }
 521
 522
 523 void spdc_endpoint_snap_free(SPEventContext const * const ec, Geom::Point& p, guint const /*state*/)
 524 {
 525     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 526     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 527     Geom::Point pt2g = to_2geom(p);
 528     m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g);
 529     p = from_2geom(pt2g);
 530 }
 531
 532 static SPCurve *
 533 reverse_then_unref(SPCurve *orig)
 534 {
 535     SPCurve *ret = orig->create_reverse();
 536     orig->unref();
 537     return ret;
 538 }
 539
 540 /**
 541  * Concats red, blue and green.
 542  * If any anchors are defined, process these, optionally removing curves from white list
 543  * Invoke _flush_white to write result back to object.
 544  */
 545 void
 546 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 547 {
 548     /* Concat RBG */
 549     SPCurve *c = dc->green_curve;
 550
 551     /* Green */
 552     dc->green_curve = new SPCurve();
 553     while (dc->green_bpaths) {
 554         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 555         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 556     }
 557     /* Blue */
 558     c->append_continuous(dc->blue_curve, 0.0625);
 559     dc->blue_curve->reset();
 560     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 561     /* Red */
 562     if (dc->red_curve_is_valid) {
 563         c->append_continuous(dc->red_curve, 0.0625);
 564     }
 565     dc->red_curve->reset();
 566     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 567
 568     if (c->is_empty()) {
 569         c->unref();
 570         return;
 571     }
 572
 573     /* Step A - test, whether we ended on green anchor */
 574     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 575         // We hit green anchor, closing Green-Blue-Red
 576         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 577         c->closepath_current();
 578         /* Closed path, just flush */
 579         spdc_flush_white(dc, c);
 580         c->unref();
 581         return;
 582     }
 583
 584     /* Step B - both start and end anchored to same curve */
 585     if ( dc->sa && dc->ea
 586          && ( dc->sa->curve == dc->ea->curve )
 587          && ( ( dc->sa != dc->ea )
 588               || dc->sa->curve->is_closed() ) )
 589     {
 590         // We hit bot start and end of single curve, closing paths
 591         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 592         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 593             c = reverse_then_unref(c);
 594         }
 595         dc->sa->curve->append_continuous(c, 0.0625);
 596         c->unref();
 597         dc->sa->curve->closepath_current();
 598         spdc_flush_white(dc, NULL);
 599         return;
 600     }
 601
 602     /* Step C - test start */
 603     if (dc->sa) {
 604         SPCurve *s = dc->sa->curve;
 605         dc->white_curves = g_slist_remove(dc->white_curves, s);
 606         if (dc->sa->start) {
 607             s = reverse_then_unref(s);
 608         }
 609         s->append_continuous(c, 0.0625);
 610         c->unref();
 611         c = s;
 612     } else /* Step D - test end */ if (dc->ea) {
 613         SPCurve *e = dc->ea->curve;
 614         dc->white_curves = g_slist_remove(dc->white_curves, e);
 615         if (!dc->ea->start) {
 616             e = reverse_then_unref(e);
 617         }
 618         c->append_continuous(e, 0.0625);
 619         e->unref();
 620     }
 621
 622
 623     spdc_flush_white(dc, c);
 624
 625     c->unref();
 626 }
 627
 628 /*
 629  * Flushes white curve(s) and additional curve into object
 630  *
 631  * No cleaning of colored curves - this has to be done by caller
 632  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 633  *
 634  */
 635
 636 static void
 637 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 638 {
 639     SPCurve *c;
 640
 641     if (dc->white_curves) {
 642         g_assert(dc->white_item);
 643         c = SPCurve::concat(dc->white_curves);
 644         g_slist_free(dc->white_curves);
 645         dc->white_curves = NULL;
 646         if (gc) {
 647             c->append(gc, FALSE);
 648         }
 649     } else if (gc) {
 650         c = gc;
 651         c->ref();
 652     } else {
 653         return;
 654     }
 655
 656     /* Now we have to go back to item coordinates at last */
 657     c->transform( dc->white_item
 658                             ? sp_item_dt2i_affine(dc->white_item)
 659                             : to_2geom(sp_desktop_dt2doc_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) );
 660
 661     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 662     SPDocument *doc = sp_desktop_document(desktop);
 663     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 664
 665     if ( c && !c->is_empty() ) {
 666         /* We actually have something to write */
 667
 668         bool has_lpe = false;
 669         Inkscape::XML::Node *repr;
 670         if (dc->white_item) {
 671             repr = SP_OBJECT_REPR(dc->white_item);
 672             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 673         } else {
 674             repr = xml_doc->createElement("svg:path");
 675             /* Set style */
 676             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc).data(), false);
 677         }
 678
 679         gchar *str = sp_svg_write_path( c->get_pathvector() );
 680         g_assert( str != NULL );
 681         if (has_lpe)
 682             repr->setAttribute("inkscape:original-d", str);
 683         else
 684             repr->setAttribute("d", str);
 685         g_free(str);
 686
 687         if (!dc->white_item) {
 688             /* Attach repr */
 689             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 690
 691             // we finished the path; now apply any waiting LPEs or freehand shapes
 692             spdc_check_for_and_apply_waiting_LPE(dc, item);
 693
 694             dc->selection->set(repr);
 695             Inkscape::GC::release(repr);
 696             item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
 697             item->updateRepr();
 698         }
 699
 700         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 701                          _("Draw path"));
 702
 703         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 704         // flushed before the selection_modified signal is fired by the previous change, which
 705         // results in the tool losing all of the selected path's curve except that last subpath. To
 706         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 707         // in sync immediately.
 708         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 709     }
 710
 711     c->unref();
 712
 713     /* Flush pending updates */
 714     sp_document_ensure_up_to_date(doc);
 715 }
 716
 717 /**
 718  * Returns FIRST active anchor (the activated one).
 719  */
 720 SPDrawAnchor *
 721 spdc_test_inside(SPDrawContext *dc, Geom::Point p)
 722 {
 723     SPDrawAnchor *active = NULL;
 724
 725     /* Test green anchor */
 726     if (dc->green_anchor) {
 727         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 728     }
 729
 730     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 731         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 732         if ( !active && na ) {
 733             active = na;
 734         }
 735     }
 736
 737     return active;
 738 }
 739
 740 static void
 741 spdc_reset_white(SPDrawContext *dc)
 742 {
 743     if (dc->white_item) {
 744         /* We do not hold refcount */
 745         dc->white_item = NULL;
 746     }
 747     while (dc->white_curves) {
 748         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 749         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 750     }
 751     while (dc->white_anchors) {
 752         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 753         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 754     }
 755 }
 756
 757 static void
 758 spdc_free_colors(SPDrawContext *dc)
 759 {
 760     /* Red */
 761     if (dc->red_bpath) {
 762         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 763         dc->red_bpath = NULL;
 764     }
 765     if (dc->red_curve) {
 766         dc->red_curve = dc->red_curve->unref();
 767     }
 768     /* Blue */
 769     if (dc->blue_bpath) {
 770         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 771         dc->blue_bpath = NULL;
 772     }
 773     if (dc->blue_curve) {
 774         dc->blue_curve = dc->blue_curve->unref();
 775     }
 776     /* Green */
 777     while (dc->green_bpaths) {
 778         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 779         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 780     }
 781     if (dc->green_curve) {
 782         dc->green_curve = dc->green_curve->unref();
 783     }
 784     if (dc->green_anchor) {
 785         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 786     }
 787     /* White */
 788     if (dc->white_item) {
 789         /* We do not hold refcount */
 790         dc->white_item = NULL;
 791     }
 792     while (dc->white_curves) {
 793         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 794         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 795     }
 796     while (dc->white_anchors) {
 797         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 798         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 799     }
 800 }
 801
 802 /* Create a single dot represented by a circle */
 803 void spdc_create_single_dot(SPEventContext *ec, Geom::Point const &pt, char const *tool, guint event_state) {
 804     g_return_if_fail(!strcmp(tool, "/tools/freehand/pen") || !strcmp(tool, "/tools/freehand/pencil"));
 805     Glib::ustring tool_path = tool;
 806
 807     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 808     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 809     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 810     repr->setAttribute("sodipodi:type", "arc");
 811     SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 812     Inkscape::GC::release(repr);
 813
 814     /* apply the tool's current style */
 815     sp_desktop_apply_style_tool(desktop, repr, tool, false);
 816
 817     /* find out stroke width (TODO: is there an easier way??) */
 818     double stroke_width = 3.0;
 819     gchar const *style_str = NULL;
 820     style_str = repr->attribute("style");
 821     if (style_str) {
 822         SPStyle *style = sp_style_new(SP_ACTIVE_DOCUMENT);
 823         sp_style_merge_from_style_string(style, style_str);
 824         stroke_width = style->stroke_width.computed;
 825         style->stroke_width.computed = 0;
 826         sp_style_unref(style);
 827     }
 828     /* unset stroke and set fill color to former stroke color */
 829     gchar * str;
 830     str = g_strdup_printf("fill:#%06x;stroke:none;", sp_desktop_get_color_tool(desktop, tool, false) >> 8);
 831     repr->setAttribute("style", str);
 832     g_free(str);
 833
 834     /* put the circle where the mouse click occurred and set the diameter to the
 835        current stroke width, multiplied by the amount specified in the preferences */
 836     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 837
 838     Geom::Matrix const i2d (sp_item_i2d_affine (item));
 839     Geom::Point pp = pt * i2d;
 840     double rad = 0.5 * prefs->getDouble(tool_path + "/dot-size", 3.0);
 841     if (event_state & GDK_MOD1_MASK) {
 842         /* TODO: We vary the dot size between 0.5*rad and 1.5*rad, where rad is the dot size
 843            as specified in prefs. Very simple, but it might be sufficient in practice. If not,
 844            we need to devise something more sophisticated. */
 845         double s = g_random_double_range(-0.5, 0.5);
 846         rad *= (1 + s);
 847     }
 848     if (event_state & GDK_SHIFT_MASK) {
 849         // double the point size
 850         rad *= 2;
 851     }
 852
 853     sp_repr_set_svg_double (repr, "sodipodi:cx", pp[Geom::X]);
 854     sp_repr_set_svg_double (repr, "sodipodi:cy", pp[Geom::Y]);
 855     sp_repr_set_svg_double (repr, "sodipodi:rx", rad * stroke_width);
 856     sp_repr_set_svg_double (repr, "sodipodi:ry", rad * stroke_width);
 857     item->updateRepr();
 858
 859     sp_desktop_selection(desktop)->set(item);
 860
 861     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating single dot"));
 862     sp_document_done(sp_desktop_document(desktop), SP_VERB_NONE, _("Create single dot"));
 863 }
 864
 865 /*
 866   Local Variables:
 867   mode:c++
 868   c-file-style:"stroustrup"
 869   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 870   indent-tabs-mode:nil
 871   fill-column:99
 872   End:
 873 */
 874 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :