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-handles.h"
  30 #include "desktop-style.h"
  31 #include "document.h"
  32 #include "draw-anchor.h"
  33 #include "macros.h"
  34 #include "message-stack.h"
  35 #include "pen-context.h"
  36 #include "lpe-tool-context.h"
  37 #include "preferences.h"
  38 #include "selection.h"
  39 #include "selection-chemistry.h"
  40 #include "snap.h"
  41 #include "sp-path.h"
  42 #include "sp-namedview.h"
  43 #include "live_effects/lpe-patternalongpath.h"
  44 #include "style.h"
  45
  46 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  47 static void sp_draw_context_init(SPDrawContext *dc);
  48 static void sp_draw_context_dispose(GObject *object);
  49
  50 static void sp_draw_context_setup(SPEventContext *ec);
  51 static void sp_draw_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
  52 static void sp_draw_context_finish(SPEventContext *ec);
  53
  54 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  55
  56 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  57 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  58
  59 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  60
  61 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  62
  63 static void spdc_reset_white(SPDrawContext *dc);
  64 static void spdc_free_colors(SPDrawContext *dc);
  65
  66
  67 static SPEventContextClass *draw_parent_class;
  68
  69
  70 GType
  71 sp_draw_context_get_type(void)
  72 {
  73     static GType type = 0;
  74     if (!type) {
  75         GTypeInfo info = {
  76             sizeof(SPDrawContextClass),
  77             NULL, NULL,
  78             (GClassInitFunc) sp_draw_context_class_init,
  79             NULL, NULL,
  80             sizeof(SPDrawContext),
  81             4,
  82             (GInstanceInitFunc) sp_draw_context_init,
  83             NULL,   /* value_table */
  84         };
  85         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  86     }
  87     return type;
  88 }
  89
  90 static void
  91 sp_draw_context_class_init(SPDrawContextClass *klass)
  92 {
  93     GObjectClass *object_class;
  94     SPEventContextClass *ec_class;
  95
  96     object_class = (GObjectClass *)klass;
  97     ec_class = (SPEventContextClass *) klass;
  98
  99     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 100
 101     object_class->dispose = sp_draw_context_dispose;
 102
 103     ec_class->setup = sp_draw_context_setup;
 104     ec_class->set = sp_draw_context_set;
 105     ec_class->finish = sp_draw_context_finish;
 106     ec_class->root_handler = sp_draw_context_root_handler;
 107 }
 108
 109 static void
 110 sp_draw_context_init(SPDrawContext *dc)
 111 {
 112     dc->attach = FALSE;
 113
 114     dc->red_color = 0xff00007f;
 115     dc->blue_color = 0x0000ff7f;
 116     dc->green_color = 0x00ff007f;
 117     dc->red_curve_is_valid = false;
 118
 119     dc->red_bpath = NULL;
 120     dc->red_curve = NULL;
 121
 122     dc->blue_bpath = NULL;
 123     dc->blue_curve = NULL;
 124
 125     dc->green_bpaths = NULL;
 126     dc->green_curve = NULL;
 127     dc->green_anchor = NULL;
 128     dc->green_closed = false;
 129
 130     dc->white_item = NULL;
 131     dc->white_curves = NULL;
 132     dc->white_anchors = NULL;
 133
 134     dc->sa = NULL;
 135     dc->ea = NULL;
 136
 137     dc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
 138
 139     new (&dc->sel_changed_connection) sigc::connection();
 140     new (&dc->sel_modified_connection) sigc::connection();
 141 }
 142
 143 static void
 144 sp_draw_context_dispose(GObject *object)
 145 {
 146     SPDrawContext *dc = SP_DRAW_CONTEXT(object);
 147
 148     dc->sel_changed_connection.~connection();
 149     dc->sel_modified_connection.~connection();
 150
 151     if (dc->grab) {
 152         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 153         dc->grab = NULL;
 154     }
 155
 156     if (dc->selection) {
 157         dc->selection = NULL;
 158     }
 159
 160     spdc_free_colors(dc);
 161
 162     G_OBJECT_CLASS(draw_parent_class)->dispose(object);
 163 }
 164
 165 static void
 166 sp_draw_context_setup(SPEventContext *ec)
 167 {
 168     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 169     SPDesktop *dt = ec->desktop;
 170
 171     if (((SPEventContextClass *) draw_parent_class)->setup) {
 172         ((SPEventContextClass *) draw_parent_class)->setup(ec);
 173     }
 174
 175     dc->selection = sp_desktop_selection(dt);
 176
 177     /* Connect signals to track selection changes */
 178     dc->sel_changed_connection = dc->selection->connectChanged(
 179         sigc::bind(sigc::ptr_fun(&spdc_selection_changed), dc)
 180     );
 181     dc->sel_modified_connection = dc->selection->connectModified(
 182         sigc::bind(sigc::ptr_fun(&spdc_selection_modified), dc)
 183     );
 184
 185     /* Create red bpath */
 186     dc->red_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 187     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->red_bpath), dc->red_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 188     /* Create red curve */
 189     dc->red_curve = new SPCurve();
 190
 191     /* Create blue bpath */
 192     dc->blue_bpath = sp_canvas_bpath_new(sp_desktop_sketch(ec->desktop), NULL);
 193     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->blue_bpath), dc->blue_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 194     /* Create blue curve */
 195     dc->blue_curve = new SPCurve();
 196
 197     /* Create green curve */
 198     dc->green_curve = new SPCurve();
 199     /* No green anchor by default */
 200     dc->green_anchor = NULL;
 201     dc->green_closed = FALSE;
 202
 203     dc->attach = TRUE;
 204     spdc_attach_selection(dc, dc->selection);
 205 }
 206
 207 static void
 208 sp_draw_context_finish(SPEventContext *ec)
 209 {
 210     SPDrawContext *dc = SP_DRAW_CONTEXT(ec);
 211
 212     dc->sel_changed_connection.disconnect();
 213     dc->sel_modified_connection.disconnect();
 214
 215     if (dc->grab) {
 216         sp_canvas_item_ungrab(dc->grab, GDK_CURRENT_TIME);
 217     }
 218
 219     if (dc->selection) {
 220         dc->selection = NULL;
 221     }
 222
 223     spdc_free_colors(dc);
 224 }
 225
 226 static void
 227 sp_draw_context_set(SPEventContext */*ec*/, Inkscape::Preferences::Entry */*val*/)
 228 {
 229 }
 230
 231 gint
 232 sp_draw_context_root_handler(SPEventContext *ec, GdkEvent *event)
 233 {
 234     gint ret = FALSE;
 235
 236     switch (event->type) {
 237         case GDK_KEY_PRESS:
 238             switch (get_group0_keyval (&event->key)) {
 239                 case GDK_Up:
 240                 case GDK_Down:
 241                 case GDK_KP_Up:
 242                 case GDK_KP_Down:
 243                     // prevent the zoom field from activation
 244                     if (!MOD__CTRL_ONLY) {
 245                         ret = TRUE;
 246                     }
 247                     break;
 248                 default:
 249             break;
 250         }
 251         break;
 252     default:
 253         break;
 254     }
 255
 256     if (!ret) {
 257         if (((SPEventContextClass *) draw_parent_class)->root_handler) {
 258             ret = ((SPEventContextClass *) draw_parent_class)->root_handler(ec, event);
 259         }
 260     }
 261
 262     return ret;
 263 }
 264
 265 static Glib::ustring const
 266 tool_name(SPDrawContext *dc)
 267 {
 268     return ( SP_IS_PEN_CONTEXT(dc)
 269              ? "/tools/freehand/pen"
 270              : "/tools/freehand/pencil" );
 271 }
 272
 273 static void
 274 spdc_paste_curve_as_freehand_shape(const SPCurve *c, SPDrawContext *dc, SPItem *item)
 275 {
 276     using namespace Inkscape::LivePathEffect;
 277
 278     // TODO: Don't paste path if nothing is on the clipboard
 279
 280     Effect::createAndApply(PATTERN_ALONG_PATH, dc->desktop->doc(), item);
 281     Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 282     gchar *svgd = sp_svg_write_path(c->get_pathvector());
 283     static_cast<LPEPatternAlongPath*>(lpe)->pattern.paste_param_path(svgd);
 284 }
 285
 286 /*
 287  * If we have an item and a waiting LPE, apply the effect to the item
 288  * (spiro spline mode is treated separately)
 289  */
 290 void
 291 spdc_check_for_and_apply_waiting_LPE(SPDrawContext *dc, SPItem *item)
 292 {
 293     using namespace Inkscape::LivePathEffect;
 294     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 295
 296     if (item && SP_IS_LPE_ITEM(item)) {
 297         if (prefs->getInt(tool_name(dc) + "/freehand-mode", 0) == 1) {
 298             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 299         }
 300
 301         int shape = prefs->getInt(tool_name(dc) + "/shape", 0);
 302         bool shape_applied = false;
 303         SPCSSAttr *css_item = sp_css_attr_from_object (SP_OBJECT(item), SP_STYLE_FLAG_ALWAYS);
 304         const char *cstroke = sp_repr_css_property(css_item, "stroke", "none");
 305
 306 #define SHAPE_LENGTH 10
 307 #define SHAPE_HEIGHT 10
 308
 309         switch (shape) {
 310             case 0:
 311                 // don't apply any shape
 312                 break;
 313             case 1:
 314             {
 315                 // "triangle in"
 316                 // TODO: this is only for illustration (we create a "decrescendo"-shaped path
 317                 //       manually; eventually we should read the path from a separate file)
 318                 SPCurve *c = new SPCurve();
 319                 c->moveto(0,0);
 320                 c->lineto(0, SHAPE_HEIGHT);
 321                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT/2);
 322                 c->closepath();
 323                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 324                 c->unref();
 325
 326                 shape_applied = true;
 327                 break;
 328             }
 329             case 2:
 330             {
 331                 // "triangle out"
 332                 SPCurve *c = new SPCurve();
 333                 c->moveto(0, SHAPE_HEIGHT/2);
 334                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT);
 335                 c->lineto(SHAPE_LENGTH, 0);
 336                 c->closepath();
 337                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 338                 c->unref();
 339
 340                 shape_applied = true;
 341                 break;
 342             }
 343             case 3:
 344             {
 345                 // "ellipse"
 346                 SPCurve *c = new SPCurve();
 347                 const double C1 = 0.552;
 348                 c->moveto(0, SHAPE_HEIGHT/2);
 349                 c->curveto(0, (1 - C1) * SHAPE_HEIGHT/2, (1 - C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH/2, 0);
 350                 c->curveto((1 + C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH, (1 - C1) * SHAPE_HEIGHT/2, SHAPE_LENGTH, SHAPE_HEIGHT/2);
 351                 c->curveto(SHAPE_LENGTH, (1 + C1) * SHAPE_HEIGHT/2, (1 + C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, SHAPE_LENGTH/2, SHAPE_HEIGHT);
 352                 c->curveto((1 - C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, 0, (1 + C1) * SHAPE_HEIGHT/2, 0, SHAPE_HEIGHT/2);
 353                 c->closepath();
 354                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 355                 c->unref();
 356                 shape_applied = true;
 357                 break;
 358             }
 359             case 4:
 360             {
 361                 // take shape from clipboard; TODO: catch the case where clipboard is empty
 362                 Effect::createAndApply(PATTERN_ALONG_PATH, dc->desktop->doc(), item);
 363                 Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 364                 static_cast<LPEPatternAlongPath*>(lpe)->pattern.on_paste_button_click();
 365
 366                 shape_applied = true;
 367                 break;
 368             }
 369             default:
 370                 break;
 371         }
 372         if (shape_applied) {
 373             // apply original stroke color as fill and unset stroke; then return
 374             SPCSSAttr *css = sp_repr_css_attr_new();
 375
 376             if (!strcmp(cstroke, "none")){
 377                 sp_repr_css_set_property (css, "fill", "black");
 378             } else {
 379                 sp_repr_css_set_property (css, "fill", cstroke);
 380             }
 381             sp_repr_css_set_property (css, "stroke", "none");
 382             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 383             sp_repr_css_attr_unref(css);
 384             return;
 385         }
 386
 387         if (dc->waiting_LPE_type != INVALID_LPE) {
 388             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 389             dc->waiting_LPE_type = INVALID_LPE;
 390
 391             if (SP_IS_LPETOOL_CONTEXT(dc)) {
 392                 // since a geometric LPE was applied, we switch back to "inactive" mode
 393                 lpetool_context_switch_mode(SP_LPETOOL_CONTEXT(dc), INVALID_LPE);
 394             }
 395         }
 396         if (SP_IS_PEN_CONTEXT(dc)) {
 397             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 398         }
 399     }
 400 }
 401
 402 /*
 403  * Selection handlers
 404  */
 405
 406 static void
 407 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 408 {
 409     if (dc->attach) {
 410         spdc_attach_selection(dc, sel);
 411     }
 412 }
 413
 414 /* fixme: We have to ensure this is not delayed (Lauris) */
 415
 416 static void
 417 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 418 {
 419     if (dc->attach) {
 420         spdc_attach_selection(dc, sel);
 421     }
 422 }
 423
 424 static void
 425 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 426 {
 427     /* We reset white and forget white/start/end anchors */
 428     spdc_reset_white(dc);
 429     dc->sa = NULL;
 430     dc->ea = NULL;
 431
 432     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 433
 434     if ( item && SP_IS_PATH(item) ) {
 435         /* Create new white data */
 436         /* Item */
 437         dc->white_item = item;
 438         /* Curve list */
 439         /* We keep it in desktop coordinates to eliminate calculation errors */
 440         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 441         norm->transform((dc->white_item)->i2d_affine());
 442         g_return_if_fail( norm != NULL );
 443         dc->white_curves = g_slist_reverse(norm->split());
 444         norm->unref();
 445         /* Anchor list */
 446         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 447             SPCurve *c;
 448             c = (SPCurve*)l->data;
 449             g_return_if_fail( c->get_segment_count() > 0 );
 450             if ( !c->is_closed() ) {
 451                 SPDrawAnchor *a;
 452                 a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
 453                 if (a)
 454                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 455                 a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
 456                 if (a)
 457                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 458             }
 459         }
 460         /* fixme: recalculate active anchor? */
 461     }
 462 }
 463
 464
 465 /**
 466  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 467  *
 468  *  \param dc draw context
 469  *  \param p cursor point (to be changed by snapping)
 470  *  \param o origin point
 471  *  \param state  keyboard state to check if ctrl was pressed
 472 */
 473
 474 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, Geom::Point &p, Geom::Point const &o,
 475                                  guint state)
 476 {
 477     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 478     unsigned const snaps = abs(prefs->getInt("/options/rotationsnapsperpi/value", 12));
 479     /* 0 means no snapping. */
 480
 481     /* mirrored by fabs, so this corresponds to 15 degrees */
 482     Geom::Point best; /* best solution */
 483     double bn = NR_HUGE; /* best normal */
 484     double bdot = 0;
 485     Geom::Point v = Geom::Point(0, 1);
 486     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 487     double const r10 = -r01, r11 = r00;
 488
 489     Geom::Point delta = p - o;
 490
 491     for (unsigned i = 0; i < snaps; i++) {
 492         double const ndot = fabs(dot(v,Geom::rot90(delta)));
 493         Geom::Point t(r00*v[Geom::X] + r01*v[Geom::Y],
 494                     r10*v[Geom::X] + r11*v[Geom::Y]);
 495         if (ndot < bn) {
 496             /* I think it is better numerically to use the normal, rather than the dot product
 497              * to assess solutions, but I haven't proven it. */
 498             bn = ndot;
 499             best = v;
 500             bdot = dot(v, delta);
 501         }
 502         v = t;
 503     }
 504
 505     if (fabs(bdot) > 0) {
 506         p = o + bdot * best;
 507
 508         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 509                                          //After all, the user explicitly asked for angular snapping by
 510                                          //pressing CTRL
 511             /* Snap it along best vector */
 512             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 513             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 514             m.constrainedSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE, Inkscape::Snapper::ConstraintLine(best));
 515         }
 516     }
 517 }
 518
 519
 520 void spdc_endpoint_snap_free(SPEventContext const * const ec, Geom::Point& p, guint const /*state*/)
 521 {
 522     SPDesktop *dt = SP_EVENT_CONTEXT_DESKTOP(ec);
 523     SnapManager &m = dt->namedview->snap_manager;
 524     Inkscape::Selection *selection = sp_desktop_selection (dt);
 525
 526     // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
 527     // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
 528
 529     m.setup(dt, true, selection->singleItem());
 530     m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
 531 }
 532
 533 static SPCurve *
 534 reverse_then_unref(SPCurve *orig)
 535 {
 536     SPCurve *ret = orig->create_reverse();
 537     orig->unref();
 538     return ret;
 539 }
 540
 541 /**
 542  * Concats red, blue and green.
 543  * If any anchors are defined, process these, optionally removing curves from white list
 544  * Invoke _flush_white to write result back to object.
 545  */
 546 void
 547 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 548 {
 549     /* Concat RBG */
 550     SPCurve *c = dc->green_curve;
 551
 552     /* Green */
 553     dc->green_curve = new SPCurve();
 554     while (dc->green_bpaths) {
 555         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 556         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 557     }
 558     /* Blue */
 559     c->append_continuous(dc->blue_curve, 0.0625);
 560     dc->blue_curve->reset();
 561     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 562     /* Red */
 563     if (dc->red_curve_is_valid) {
 564         c->append_continuous(dc->red_curve, 0.0625);
 565     }
 566     dc->red_curve->reset();
 567     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 568
 569     if (c->is_empty()) {
 570         c->unref();
 571         return;
 572     }
 573
 574     /* Step A - test, whether we ended on green anchor */
 575     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 576         // We hit green anchor, closing Green-Blue-Red
 577         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 578         c->closepath_current();
 579         /* Closed path, just flush */
 580         spdc_flush_white(dc, c);
 581         c->unref();
 582         return;
 583     }
 584
 585     /* Step B - both start and end anchored to same curve */
 586     if ( dc->sa && dc->ea
 587          && ( dc->sa->curve == dc->ea->curve )
 588          && ( ( dc->sa != dc->ea )
 589               || dc->sa->curve->is_closed() ) )
 590     {
 591         // We hit bot start and end of single curve, closing paths
 592         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 593         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 594             c = reverse_then_unref(c);
 595         }
 596         dc->sa->curve->append_continuous(c, 0.0625);
 597         c->unref();
 598         dc->sa->curve->closepath_current();
 599         spdc_flush_white(dc, NULL);
 600         return;
 601     }
 602
 603     /* Step C - test start */
 604     if (dc->sa) {
 605         SPCurve *s = dc->sa->curve;
 606         dc->white_curves = g_slist_remove(dc->white_curves, s);
 607         if (dc->sa->start) {
 608             s = reverse_then_unref(s);
 609         }
 610         s->append_continuous(c, 0.0625);
 611         c->unref();
 612         c = s;
 613     } else /* Step D - test end */ if (dc->ea) {
 614         SPCurve *e = dc->ea->curve;
 615         dc->white_curves = g_slist_remove(dc->white_curves, e);
 616         if (!dc->ea->start) {
 617             e = reverse_then_unref(e);
 618         }
 619         c->append_continuous(e, 0.0625);
 620         e->unref();
 621     }
 622
 623
 624     spdc_flush_white(dc, c);
 625
 626     c->unref();
 627 }
 628
 629 /*
 630  * Flushes white curve(s) and additional curve into object
 631  *
 632  * No cleaning of colored curves - this has to be done by caller
 633  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 634  *
 635  */
 636
 637 static void
 638 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 639 {
 640     SPCurve *c;
 641
 642     if (dc->white_curves) {
 643         g_assert(dc->white_item);
 644         c = SPCurve::concat(dc->white_curves);
 645         g_slist_free(dc->white_curves);
 646         dc->white_curves = NULL;
 647         if (gc) {
 648             c->append(gc, FALSE);
 649         }
 650     } else if (gc) {
 651         c = gc;
 652         c->ref();
 653     } else {
 654         return;
 655     }
 656
 657     /* Now we have to go back to item coordinates at last */
 658     c->transform( dc->white_item
 659                             ? (dc->white_item)->dt2i_affine()
 660                             : SP_EVENT_CONTEXT_DESKTOP(dc)->dt2doc() );
 661
 662     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 663     SPDocument *doc = sp_desktop_document(desktop);
 664     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 665
 666     if ( c && !c->is_empty() ) {
 667         /* We actually have something to write */
 668
 669         bool has_lpe = false;
 670         Inkscape::XML::Node *repr;
 671         if (dc->white_item) {
 672             repr = SP_OBJECT_REPR(dc->white_item);
 673             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 674         } else {
 675             repr = xml_doc->createElement("svg:path");
 676             /* Set style */
 677             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc).data(), false);
 678         }
 679
 680         gchar *str = sp_svg_write_path( c->get_pathvector() );
 681         g_assert( str != NULL );
 682         if (has_lpe)
 683             repr->setAttribute("inkscape:original-d", str);
 684         else
 685             repr->setAttribute("d", str);
 686         g_free(str);
 687
 688         if (!dc->white_item) {
 689             /* Attach repr */
 690             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 691
 692             // we finished the path; now apply any waiting LPEs or freehand shapes
 693             spdc_check_for_and_apply_waiting_LPE(dc, item);
 694
 695             dc->selection->set(repr);
 696             Inkscape::GC::release(repr);
 697             item->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
 698             item->updateRepr();
 699         }
 700
 701         SPDocumentUndo::done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 702                          _("Draw path"));
 703
 704         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 705         // flushed before the selection_modified signal is fired by the previous change, which
 706         // results in the tool losing all of the selected path's curve except that last subpath. To
 707         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 708         // in sync immediately.
 709         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 710     }
 711
 712     c->unref();
 713
 714     /* Flush pending updates */
 715     doc->ensure_up_to_date();
 716 }
 717
 718 /**
 719  * Returns FIRST active anchor (the activated one).
 720  */
 721 SPDrawAnchor *
 722 spdc_test_inside(SPDrawContext *dc, Geom::Point p)
 723 {
 724     SPDrawAnchor *active = NULL;
 725
 726     /* Test green anchor */
 727     if (dc->green_anchor) {
 728         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 729     }
 730
 731     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 732         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 733         if ( !active && na ) {
 734             active = na;
 735         }
 736     }
 737
 738     return active;
 739 }
 740
 741 static void
 742 spdc_reset_white(SPDrawContext *dc)
 743 {
 744     if (dc->white_item) {
 745         /* We do not hold refcount */
 746         dc->white_item = NULL;
 747     }
 748     while (dc->white_curves) {
 749         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 750         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 751     }
 752     while (dc->white_anchors) {
 753         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 754         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 755     }
 756 }
 757
 758 static void
 759 spdc_free_colors(SPDrawContext *dc)
 760 {
 761     /* Red */
 762     if (dc->red_bpath) {
 763         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 764         dc->red_bpath = NULL;
 765     }
 766     if (dc->red_curve) {
 767         dc->red_curve = dc->red_curve->unref();
 768     }
 769     /* Blue */
 770     if (dc->blue_bpath) {
 771         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 772         dc->blue_bpath = NULL;
 773     }
 774     if (dc->blue_curve) {
 775         dc->blue_curve = dc->blue_curve->unref();
 776     }
 777     /* Green */
 778     while (dc->green_bpaths) {
 779         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 780         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 781     }
 782     if (dc->green_curve) {
 783         dc->green_curve = dc->green_curve->unref();
 784     }
 785     if (dc->green_anchor) {
 786         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 787     }
 788     /* White */
 789     if (dc->white_item) {
 790         /* We do not hold refcount */
 791         dc->white_item = NULL;
 792     }
 793     while (dc->white_curves) {
 794         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 795         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 796     }
 797     while (dc->white_anchors) {
 798         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 799         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 800     }
 801 }
 802
 803 /* Create a single dot represented by a circle */
 804 void spdc_create_single_dot(SPEventContext *ec, Geom::Point const &pt, char const *tool, guint event_state) {
 805     g_return_if_fail(!strcmp(tool, "/tools/freehand/pen") || !strcmp(tool, "/tools/freehand/pencil"));
 806     Glib::ustring tool_path = tool;
 807
 808     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 809     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 810     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 811     repr->setAttribute("sodipodi:type", "arc");
 812     SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 813     Inkscape::GC::release(repr);
 814
 815     /* apply the tool's current style */
 816     sp_desktop_apply_style_tool(desktop, repr, tool, false);
 817
 818     /* find out stroke width (TODO: is there an easier way??) */
 819     double stroke_width = 3.0;
 820     gchar const *style_str = NULL;
 821     style_str = repr->attribute("style");
 822     if (style_str) {
 823         SPStyle *style = sp_style_new(SP_ACTIVE_DOCUMENT);
 824         sp_style_merge_from_style_string(style, style_str);
 825         stroke_width = style->stroke_width.computed;
 826         style->stroke_width.computed = 0;
 827         sp_style_unref(style);
 828     }
 829     /* unset stroke and set fill color to former stroke color */
 830     gchar * str;
 831     str = g_strdup_printf("fill:#%06x;stroke:none;", sp_desktop_get_color_tool(desktop, tool, false) >> 8);
 832     repr->setAttribute("style", str);
 833     g_free(str);
 834
 835     /* put the circle where the mouse click occurred and set the diameter to the
 836        current stroke width, multiplied by the amount specified in the preferences */
 837     Inkscape::Preferences *prefs = Inkscape::Preferences::get();
 838
 839     Geom::Matrix const i2d (item->i2d_affine ());
 840     Geom::Point pp = pt;
 841     double rad = 0.5 * prefs->getDouble(tool_path + "/dot-size", 3.0);
 842     if (event_state & GDK_MOD1_MASK) {
 843         /* TODO: We vary the dot size between 0.5*rad and 1.5*rad, where rad is the dot size
 844            as specified in prefs. Very simple, but it might be sufficient in practice. If not,
 845            we need to devise something more sophisticated. */
 846         double s = g_random_double_range(-0.5, 0.5);
 847         rad *= (1 + s);
 848     }
 849     if (event_state & GDK_SHIFT_MASK) {
 850         // double the point size
 851         rad *= 2;
 852     }
 853
 854     sp_repr_set_svg_double (repr, "sodipodi:cx", pp[Geom::X]);
 855     sp_repr_set_svg_double (repr, "sodipodi:cy", pp[Geom::Y]);
 856     sp_repr_set_svg_double (repr, "sodipodi:rx", rad * stroke_width);
 857     sp_repr_set_svg_double (repr, "sodipodi:ry", rad * stroke_width);
 858     item->updateRepr();
 859     item->set_item_transform(i2d.inverse());
 860
 861     sp_desktop_selection(desktop)->set(item);
 862
 863     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating single dot"));
 864     SPDocumentUndo::done(sp_desktop_document(desktop), SP_VERB_NONE, _("Create single dot"));
 865 }
 866
 867 /*
 868   Local Variables:
 869   mode:c++
 870   c-file-style:"stroustrup"
 871   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 872   indent-tabs-mode:nil
 873   fill-column:99
 874   End:
 875 */
 876 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :