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(Inkscape::LivePathEffect::FREEHAND_SHAPE, 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->getBool(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             sp_repr_css_set_property (css, "fill", cstroke);
 377             sp_repr_css_set_property (css, "stroke", "none");
 378             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 379             sp_repr_css_attr_unref(css);
 380             return;
 381         }
 382
 383         if (dc->waiting_LPE_type != INVALID_LPE) {
 384             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 385             dc->waiting_LPE_type = INVALID_LPE;
 386
 387             if (SP_IS_LPETOOL_CONTEXT(dc)) {
 388                 // since a geometric LPE was applied, we switch back to "inactive" mode
 389                 lpetool_context_switch_mode(SP_LPETOOL_CONTEXT(dc), Inkscape::LivePathEffect::INVALID_LPE);
 390             }
 391         }
 392         if (SP_IS_PEN_CONTEXT(dc)) {
 393             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 394         }
 395     }
 396 }
 397
 398 /*
 399  * Selection handlers
 400  */
 401
 402 static void
 403 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 404 {
 405     if (dc->attach) {
 406         spdc_attach_selection(dc, sel);
 407     }
 408 }
 409
 410 /* fixme: We have to ensure this is not delayed (Lauris) */
 411
 412 static void
 413 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 414 {
 415     if (dc->attach) {
 416         spdc_attach_selection(dc, sel);
 417     }
 418 }
 419
 420 static void
 421 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 422 {
 423     /* We reset white and forget white/start/end anchors */
 424     spdc_reset_white(dc);
 425     dc->sa = NULL;
 426     dc->ea = NULL;
 427
 428     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 429
 430     if ( item && SP_IS_PATH(item) ) {
 431         /* Create new white data */
 432         /* Item */
 433         dc->white_item = item;
 434         /* Curve list */
 435         /* We keep it in desktop coordinates to eliminate calculation errors */
 436         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 437         norm->transform(sp_item_i2d_affine(dc->white_item));
 438         g_return_if_fail( norm != NULL );
 439         dc->white_curves = g_slist_reverse(norm->split());
 440         norm->unref();
 441         /* Anchor list */
 442         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 443             SPCurve *c;
 444             c = (SPCurve*)l->data;
 445             g_return_if_fail( c->get_segment_count() > 0 );
 446             if ( !c->is_closed() ) {
 447                 SPDrawAnchor *a;
 448                 a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
 449                 if (a)
 450                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 451                 a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
 452                 if (a)
 453                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 454             }
 455         }
 456         /* fixme: recalculate active anchor? */
 457     }
 458 }
 459
 460
 461 /**
 462  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 463  *
 464  *  \param dc draw context
 465  *  \param p cursor point (to be changed by snapping)
 466  *  \param o origin point
 467  *  \param state  keyboard state to check if ctrl was pressed
 468 */
 469
 470 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, Geom::Point &p, Geom::Point const &o,
 471                                  guint state)
 472 {
 473     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 474     unsigned const snaps = abs(prefs->getInt("/options/rotationsnapsperpi/value", 12));
 475     /* 0 means no snapping. */
 476
 477     /* mirrored by fabs, so this corresponds to 15 degrees */
 478     Geom::Point best; /* best solution */
 479     double bn = NR_HUGE; /* best normal */
 480     double bdot = 0;
 481     Geom::Point v = Geom::Point(0, 1);
 482     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 483     double const r10 = -r01, r11 = r00;
 484
 485     Geom::Point delta = p - o;
 486
 487     for (unsigned i = 0; i < snaps; i++) {
 488         double const ndot = fabs(dot(v,Geom::rot90(delta)));
 489         Geom::Point t(r00*v[Geom::X] + r01*v[Geom::Y],
 490                     r10*v[Geom::X] + r11*v[Geom::Y]);
 491         if (ndot < bn) {
 492             /* I think it is better numerically to use the normal, rather than the dot product
 493              * to assess solutions, but I haven't proven it. */
 494             bn = ndot;
 495             best = v;
 496             bdot = dot(v, delta);
 497         }
 498         v = t;
 499     }
 500
 501     if (fabs(bdot) > 0) {
 502         p = o + bdot * best;
 503
 504         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 505                                          //After all, the user explicitely asked for angular snapping by
 506                                          //pressing CTRL
 507             /* Snap it along best vector */
 508             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 509             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 510             Geom::Point pt2g = to_2geom(p);
 511             m.constrainedSnapReturnByRef( Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::Snapper::ConstraintLine(best));
 512             p = from_2geom(pt2g);
 513         }
 514     }
 515 }
 516
 517
 518 void spdc_endpoint_snap_free(SPEventContext const * const ec, Geom::Point& p, guint const /*state*/)
 519 {
 520     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 521     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 522     Geom::Point pt2g = to_2geom(p);
 523     m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g);
 524     p = from_2geom(pt2g);
 525 }
 526
 527 static SPCurve *
 528 reverse_then_unref(SPCurve *orig)
 529 {
 530     SPCurve *ret = orig->create_reverse();
 531     orig->unref();
 532     return ret;
 533 }
 534
 535 /**
 536  * Concats red, blue and green.
 537  * If any anchors are defined, process these, optionally removing curves from white list
 538  * Invoke _flush_white to write result back to object.
 539  */
 540 void
 541 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 542 {
 543     /* Concat RBG */
 544     SPCurve *c = dc->green_curve;
 545
 546     /* Green */
 547     dc->green_curve = new SPCurve();
 548     while (dc->green_bpaths) {
 549         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 550         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 551     }
 552     /* Blue */
 553     c->append_continuous(dc->blue_curve, 0.0625);
 554     dc->blue_curve->reset();
 555     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 556     /* Red */
 557     if (dc->red_curve_is_valid) {
 558         c->append_continuous(dc->red_curve, 0.0625);
 559     }
 560     dc->red_curve->reset();
 561     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 562
 563     if (c->is_empty()) {
 564         c->unref();
 565         return;
 566     }
 567
 568     /* Step A - test, whether we ended on green anchor */
 569     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 570         // We hit green anchor, closing Green-Blue-Red
 571         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 572         c->closepath_current();
 573         /* Closed path, just flush */
 574         spdc_flush_white(dc, c);
 575         c->unref();
 576         return;
 577     }
 578
 579     /* Step B - both start and end anchored to same curve */
 580     if ( dc->sa && dc->ea
 581          && ( dc->sa->curve == dc->ea->curve )
 582          && ( ( dc->sa != dc->ea )
 583               || dc->sa->curve->is_closed() ) )
 584     {
 585         // We hit bot start and end of single curve, closing paths
 586         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 587         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 588             c = reverse_then_unref(c);
 589         }
 590         dc->sa->curve->append_continuous(c, 0.0625);
 591         c->unref();
 592         dc->sa->curve->closepath_current();
 593         spdc_flush_white(dc, NULL);
 594         return;
 595     }
 596
 597     /* Step C - test start */
 598     if (dc->sa) {
 599         SPCurve *s = dc->sa->curve;
 600         dc->white_curves = g_slist_remove(dc->white_curves, s);
 601         if (dc->sa->start) {
 602             s = reverse_then_unref(s);
 603         }
 604         s->append_continuous(c, 0.0625);
 605         c->unref();
 606         c = s;
 607     } else /* Step D - test end */ if (dc->ea) {
 608         SPCurve *e = dc->ea->curve;
 609         dc->white_curves = g_slist_remove(dc->white_curves, e);
 610         if (!dc->ea->start) {
 611             e = reverse_then_unref(e);
 612         }
 613         c->append_continuous(e, 0.0625);
 614         e->unref();
 615     }
 616
 617
 618     spdc_flush_white(dc, c);
 619
 620     c->unref();
 621 }
 622
 623 /*
 624  * Flushes white curve(s) and additional curve into object
 625  *
 626  * No cleaning of colored curves - this has to be done by caller
 627  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 628  *
 629  */
 630
 631 static void
 632 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 633 {
 634     SPCurve *c;
 635
 636     if (dc->white_curves) {
 637         g_assert(dc->white_item);
 638         c = SPCurve::concat(dc->white_curves);
 639         g_slist_free(dc->white_curves);
 640         dc->white_curves = NULL;
 641         if (gc) {
 642             c->append(gc, FALSE);
 643         }
 644     } else if (gc) {
 645         c = gc;
 646         c->ref();
 647     } else {
 648         return;
 649     }
 650
 651     /* Now we have to go back to item coordinates at last */
 652     c->transform( dc->white_item
 653                             ? sp_item_dt2i_affine(dc->white_item)
 654                             : to_2geom(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) );
 655
 656     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 657     SPDocument *doc = sp_desktop_document(desktop);
 658     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 659
 660     if ( c && !c->is_empty() ) {
 661         /* We actually have something to write */
 662
 663         bool has_lpe = false;
 664         Inkscape::XML::Node *repr;
 665         if (dc->white_item) {
 666             repr = SP_OBJECT_REPR(dc->white_item);
 667             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 668         } else {
 669             repr = xml_doc->createElement("svg:path");
 670             /* Set style */
 671             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc).data(), false);
 672         }
 673
 674         gchar *str = sp_svg_write_path( c->get_pathvector() );
 675         g_assert( str != NULL );
 676         if (has_lpe)
 677             repr->setAttribute("inkscape:original-d", str);
 678         else
 679             repr->setAttribute("d", str);
 680         g_free(str);
 681
 682         if (!dc->white_item) {
 683             /* Attach repr */
 684             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 685
 686             // we finished the path; now apply any waiting LPEs or freehand shapes
 687             spdc_check_for_and_apply_waiting_LPE(dc, item);
 688
 689             dc->selection->set(repr);
 690             Inkscape::GC::release(repr);
 691             item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 692             item->updateRepr();
 693         }
 694
 695         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 696                          _("Draw path"));
 697
 698         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 699         // flushed before the selection_modified signal is fired by the previous change, which
 700         // results in the tool losing all of the selected path's curve except that last subpath. To
 701         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 702         // in sync immediately.
 703         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 704     }
 705
 706     c->unref();
 707
 708     /* Flush pending updates */
 709     sp_document_ensure_up_to_date(doc);
 710 }
 711
 712 /**
 713  * Returns FIRST active anchor (the activated one).
 714  */
 715 SPDrawAnchor *
 716 spdc_test_inside(SPDrawContext *dc, Geom::Point p)
 717 {
 718     SPDrawAnchor *active = NULL;
 719
 720     /* Test green anchor */
 721     if (dc->green_anchor) {
 722         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 723     }
 724
 725     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 726         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 727         if ( !active && na ) {
 728             active = na;
 729         }
 730     }
 731
 732     return active;
 733 }
 734
 735 static void
 736 spdc_reset_white(SPDrawContext *dc)
 737 {
 738     if (dc->white_item) {
 739         /* We do not hold refcount */
 740         dc->white_item = NULL;
 741     }
 742     while (dc->white_curves) {
 743         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 744         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 745     }
 746     while (dc->white_anchors) {
 747         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 748         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 749     }
 750 }
 751
 752 static void
 753 spdc_free_colors(SPDrawContext *dc)
 754 {
 755     /* Red */
 756     if (dc->red_bpath) {
 757         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 758         dc->red_bpath = NULL;
 759     }
 760     if (dc->red_curve) {
 761         dc->red_curve = dc->red_curve->unref();
 762     }
 763     /* Blue */
 764     if (dc->blue_bpath) {
 765         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 766         dc->blue_bpath = NULL;
 767     }
 768     if (dc->blue_curve) {
 769         dc->blue_curve = dc->blue_curve->unref();
 770     }
 771     /* Green */
 772     while (dc->green_bpaths) {
 773         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 774         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 775     }
 776     if (dc->green_curve) {
 777         dc->green_curve = dc->green_curve->unref();
 778     }
 779     if (dc->green_anchor) {
 780         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 781     }
 782     /* White */
 783     if (dc->white_item) {
 784         /* We do not hold refcount */
 785         dc->white_item = NULL;
 786     }
 787     while (dc->white_curves) {
 788         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 789         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 790     }
 791     while (dc->white_anchors) {
 792         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 793         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 794     }
 795 }
 796
 797 /* Create a single dot represented by a circle */
 798 void spdc_create_single_dot(SPEventContext *ec, Geom::Point const &pt, char const *tool, guint event_state) {
 799     g_return_if_fail(!strcmp(tool, "/tools/freehand/pen") || !strcmp(tool, "/tools/freehand/pencil"));
 800     Glib::ustring tool_path = tool;
 801
 802     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 803     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 804     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 805     repr->setAttribute("sodipodi:type", "arc");
 806     SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 807     Inkscape::GC::release(repr);
 808
 809     /* apply the tool's current style */
 810     sp_desktop_apply_style_tool(desktop, repr, tool, false);
 811
 812     /* find out stroke width (TODO: is there an easier way??) */
 813     double stroke_width = 3.0;
 814     gchar const *style_str = NULL;
 815     style_str = repr->attribute("style");
 816     if (style_str) {
 817         SPStyle *style = sp_style_new(SP_ACTIVE_DOCUMENT);
 818         sp_style_merge_from_style_string(style, style_str);
 819         stroke_width = style->stroke_width.computed;
 820         style->stroke_width.computed = 0;
 821         sp_style_unref(style);
 822     }
 823     /* unset stroke and set fill color to former stroke color */
 824     gchar * str;
 825     str = g_strdup_printf("fill:#%06x;stroke:none;", sp_desktop_get_color_tool(desktop, tool, false) >> 8);
 826     repr->setAttribute("style", str);
 827     g_free(str);
 828
 829     /* put the circle where the mouse click occurred and set the diameter to the
 830        current stroke width, multiplied by the amount specified in the preferences */
 831     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 832
 833     Geom::Matrix const i2d (sp_item_i2d_affine (item));
 834     Geom::Point pp = pt * i2d;
 835     double rad = 0.5 * prefs->getDouble(tool_path + "/dot-size", 3.0);
 836     if (event_state & GDK_MOD1_MASK) {
 837         /* TODO: We vary the dot size between 0.5*rad and 1.5*rad, where rad is the dot size
 838            as specified in prefs. Very simple, but it might be sufficient in practice. If not,
 839            we need to devise something more sophisticated. */
 840         double s = g_random_double_range(-0.5, 0.5);
 841         rad *= (1 + s);
 842     }
 843     if (event_state & GDK_SHIFT_MASK) {
 844         // double the point size
 845         rad *= 2;
 846     }
 847
 848     sp_repr_set_svg_double (repr, "sodipodi:cx", pp[Geom::X]);
 849     sp_repr_set_svg_double (repr, "sodipodi:cy", pp[Geom::Y]);
 850     sp_repr_set_svg_double (repr, "sodipodi:rx", rad * stroke_width);
 851     sp_repr_set_svg_double (repr, "sodipodi:ry", rad * stroke_width);
 852     item->updateRepr();
 853
 854     sp_desktop_selection(desktop)->set(item);
 855
 856     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating single dot"));
 857     sp_document_done(sp_desktop_document(desktop), SP_VERB_NONE, _("Create single dot"));
 858 }
 859
 860 /*
 861   Local Variables:
 862   mode:c++
 863   c-file-style:"stroustrup"
 864   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 865   indent-tabs-mode:nil
 866   fill-column:99
 867   End:
 868 */
 869 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :