src/draw-context.cpp

   1 #define __SP_DRAW_CONTEXT_C__
   2
   3 /*
   4  * Generic drawing context
   5  *
   6  * Author:
   7  *   Lauris Kaplinski <lauris@kaplinski.com>
   8  *
   9  * Copyright (C) 2000 Lauris Kaplinski
  10  * Copyright (C) 2000-2001 Ximian, Inc.
  11  * Copyright (C) 2002 Lauris Kaplinski
  12  *
  13  * Released under GNU GPL, read the file 'COPYING' for more information
  14  */
  15
  16 #define DRAW_VERBOSE
  17
  18 #ifdef HAVE_CONFIG_H
  19 # include "config.h"
  20 #endif
  21 #include <gdk/gdkkeysyms.h>
  22
  23 #include "display/canvas-bpath.h"
  24 #include "xml/repr.h"
  25 #include "svg/svg.h"
  26 #include <glibmm/i18n.h>
  27 #include "display/curve.h"
  28 #include "desktop.h"
  29 #include "desktop-affine.h"
  30 #include "desktop-handles.h"
  31 #include "desktop-style.h"
  32 #include "document.h"
  33 #include "draw-anchor.h"
  34 #include "macros.h"
  35 #include "message-stack.h"
  36 #include "pen-context.h"
  37 #include "prefs-utils.h"
  38 #include "selection.h"
  39 #include "selection-chemistry.h"
  40 #include "snap.h"
  41 #include "sp-path.h"
  42 #include "sp-namedview.h"
  43 #include "live_effects/lpe-patternalongpath.h"
  44 #include "style.h"
  45
  46 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  47 static void sp_draw_context_init(SPDrawContext *dc);
  48 static void sp_draw_context_dispose(GObject *object);
  49
  50 static void sp_draw_context_setup(SPEventContext *ec);
  51 static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value);
  52 static void sp_draw_context_finish(SPEventContext *ec);
  53
  54 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  55
  56 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  57 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  58
  59 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  60
  61 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  62
  63 static void spdc_reset_white(SPDrawContext *dc);
  64 static void spdc_free_colors(SPDrawContext *dc);
  65
  66
  67 static SPEventContextClass *draw_parent_class;
  68
  69
  70 GType
  71 sp_draw_context_get_type(void)
  72 {
  73     static GType type = 0;
  74     if (!type) {
  75         GTypeInfo info = {
  76             sizeof(SPDrawContextClass),
  77             NULL, NULL,
  78             (GClassInitFunc) sp_draw_context_class_init,
  79             NULL, NULL,
  80             sizeof(SPDrawContext),
  81             4,
  82             (GInstanceInitFunc) sp_draw_context_init,
  83             NULL,   /* value_table */
  84         };
  85         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  86     }
  87     return type;
  88 }
  89
  90 static void
  91 sp_draw_context_class_init(SPDrawContextClass *klass)
  92 {
  93     GObjectClass *object_class;
  94     SPEventContextClass *ec_class;
  95
  96     object_class = (GObjectClass *)klass;
  97     ec_class = (SPEventContextClass *) klass;
  98
  99     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 100
 101     object_class->dispose = sp_draw_context_dispose;
 102
 103     ec_class->setup = sp_draw_context_setup;
 104     ec_class->set = sp_draw_context_set;
 105     ec_class->finish = sp_draw_context_finish;
 106     ec_class->root_handler = sp_draw_context_root_handler;
 107 }
 108
 109 static void
 110 sp_draw_context_init(SPDrawContext *dc)
 111 {
 112     dc->attach = FALSE;
 113
 114     dc->red_color = 0xff00007f;
 115     dc->blue_color = 0x0000ff7f;
 116     dc->green_color = 0x00ff007f;
 117     dc->red_curve_is_valid = false;
 118
 119     dc->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*/, const gchar */*key*/, const gchar */*value*/)
 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 char 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(Inkscape::LivePathEffect::FREEHAND_SHAPE, 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
 295     if (item && SP_IS_LPE_ITEM(item)) {
 296         if (prefs_get_int_attribute(tool_name(dc), "freehand-mode", 0) == 1) {
 297             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 298         }
 299
 300         int shape = prefs_get_int_attribute(tool_name(dc), "shape", 0);
 301         bool shape_applied = false;
 302         SPCSSAttr *css_item = sp_css_attr_from_object (SP_OBJECT(item), SP_STYLE_FLAG_ALWAYS);
 303         const char *cstroke = sp_repr_css_property(css_item, "stroke", "none");
 304
 305 #define SHAPE_LENGTH 100
 306 #define SHAPE_HEIGHT 10
 307
 308         switch (shape) {
 309             case 0:
 310                 // don't apply any shape
 311                 break;
 312             case 1:
 313             {
 314                 // "triangle in"
 315                 // TODO: this is only for illustration (we create a "decrescendo"-shaped path
 316                 //       manually; eventually we should read the path from a separate file)
 317                 SPCurve *c = new SPCurve();
 318                 c->moveto(0,0);
 319                 c->lineto(0, SHAPE_HEIGHT);
 320                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT/2);
 321                 c->closepath();
 322                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 323                 c->unref();
 324
 325                 shape_applied = true;
 326                 break;
 327             }
 328             case 2:
 329             {
 330                 // "triangle out"
 331                 SPCurve *c = new SPCurve();
 332                 c->moveto(0, SHAPE_HEIGHT/2);
 333                 c->lineto(SHAPE_LENGTH, SHAPE_HEIGHT);
 334                 c->lineto(SHAPE_LENGTH, 0);
 335                 c->closepath();
 336                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 337                 c->unref();
 338
 339                 shape_applied = true;
 340                 break;
 341             }
 342             case 3:
 343             {
 344                 // "ellipse"
 345                 SPCurve *c = new SPCurve();
 346                 const double C1 = 0.552;
 347                 c->moveto(0, SHAPE_HEIGHT/2);
 348                 c->curveto(0, (1 - C1) * SHAPE_HEIGHT/2, (1 - C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH/2, 0);
 349                 c->curveto((1 + C1) * SHAPE_LENGTH/2, 0, SHAPE_LENGTH, (1 - C1) * SHAPE_HEIGHT/2, SHAPE_LENGTH, SHAPE_HEIGHT/2);
 350                 c->curveto(SHAPE_LENGTH, (1 + C1) * SHAPE_HEIGHT/2, (1 + C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, SHAPE_LENGTH/2, SHAPE_HEIGHT);
 351                 c->curveto((1 - C1) * SHAPE_LENGTH/2, SHAPE_HEIGHT, 0, (1 + C1) * SHAPE_HEIGHT/2, 0, SHAPE_HEIGHT/2);
 352                 c->closepath();
 353                 spdc_paste_curve_as_freehand_shape(c, dc, item);
 354                 c->unref();
 355                 shape_applied = true;
 356                 break;
 357             }
 358             case 4:
 359             {
 360                 // take shape from clipboard; TODO: catch the case where clipboard is empty
 361                 Effect::createAndApply(FREEHAND_SHAPE, dc->desktop->doc(), item);
 362                 Effect* lpe = sp_lpe_item_get_current_lpe(SP_LPE_ITEM(item));
 363                 static_cast<LPEPatternAlongPath*>(lpe)->pattern.on_paste_button_click();
 364
 365                 shape_applied = true;
 366                 break;
 367             }
 368             default:
 369                 break;
 370         }
 371         if (shape_applied) {
 372             // apply original stroke color as fill and unset stroke; then return
 373             SPCSSAttr *css = sp_repr_css_attr_new();
 374             sp_repr_css_set_property (css, "fill", cstroke);
 375             sp_repr_css_set_property (css, "stroke", "none");
 376             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 377             sp_repr_css_attr_unref(css);
 378             return;
 379         }
 380
 381         if (dc->waiting_LPE_type != INVALID_LPE) {
 382             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 383             dc->waiting_LPE_type = INVALID_LPE;
 384         }
 385         if (SP_IS_PEN_CONTEXT(dc)) {
 386             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 387         }
 388     }
 389 }
 390
 391 /*
 392  * Selection handlers
 393  */
 394
 395 static void
 396 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 397 {
 398     if (dc->attach) {
 399         spdc_attach_selection(dc, sel);
 400     }
 401 }
 402
 403 /* fixme: We have to ensure this is not delayed (Lauris) */
 404
 405 static void
 406 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 407 {
 408     if (dc->attach) {
 409         spdc_attach_selection(dc, sel);
 410     }
 411 }
 412
 413 static void
 414 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 415 {
 416     /* We reset white and forget white/start/end anchors */
 417     spdc_reset_white(dc);
 418     dc->sa = NULL;
 419     dc->ea = NULL;
 420
 421     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 422
 423     if ( item && SP_IS_PATH(item) ) {
 424         /* Create new white data */
 425         /* Item */
 426         dc->white_item = item;
 427         /* Curve list */
 428         /* We keep it in desktop coordinates to eliminate calculation errors */
 429         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 430         norm->transform(sp_item_i2d_affine(dc->white_item));
 431         g_return_if_fail( norm != NULL );
 432         dc->white_curves = g_slist_reverse(norm->split());
 433         norm->unref();
 434         /* Anchor list */
 435         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 436             SPCurve *c;
 437             c = (SPCurve*)l->data;
 438             g_return_if_fail( c->get_segment_count() > 0 );
 439             if ( !c->is_closed() ) {
 440                 SPDrawAnchor *a;
 441                 a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
 442                 if (a)
 443                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 444                 a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
 445                 if (a)
 446                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 447             }
 448         }
 449         /* fixme: recalculate active anchor? */
 450     }
 451 }
 452
 453
 454 /**
 455  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 456  *
 457  *  \param dc draw context
 458  *  \param p cursor point (to be changed by snapping)
 459  *  \param o origin point
 460  *  \param state  keyboard state to check if ctrl was pressed
 461 */
 462
 463 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, NR::Point &p, NR::Point const &o,
 464                                  guint state)
 465 {
 466     unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 467     /* 0 means no snapping. */
 468
 469     /* mirrored by fabs, so this corresponds to 15 degrees */
 470     NR::Point best; /* best solution */
 471     double bn = NR_HUGE; /* best normal */
 472     double bdot = 0;
 473     NR::Point v = NR::Point(0, 1);
 474     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 475     double const r10 = -r01, r11 = r00;
 476
 477     NR::Point delta = p - o;
 478
 479     for (unsigned i = 0; i < snaps; i++) {
 480         double const ndot = fabs(dot(v,NR::rot90(delta)));
 481         NR::Point t(r00*v[NR::X] + r01*v[NR::Y],
 482                     r10*v[NR::X] + r11*v[NR::Y]);
 483         if (ndot < bn) {
 484             /* I think it is better numerically to use the normal, rather than the dot product
 485              * to assess solutions, but I haven't proven it. */
 486             bn = ndot;
 487             best = v;
 488             bdot = dot(v, delta);
 489         }
 490         v = t;
 491     }
 492
 493     if (fabs(bdot) > 0) {
 494         p = o + bdot * best;
 495
 496         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 497                                          //After all, the user explicitely asked for angular snapping by
 498                                          //pressing CTRL
 499             /* Snap it along best vector */
 500             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 501             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 502             Geom::Point pt2g = to_2geom(p);
 503             m.constrainedSnapReturnByRef( Inkscape::Snapper::SNAPPOINT_NODE, pt2g, Inkscape::Snapper::ConstraintLine(best));
 504             p = from_2geom(pt2g);
 505         }
 506     }
 507 }
 508
 509
 510 void spdc_endpoint_snap_free(SPEventContext const * const ec, NR::Point& p, guint const /*state*/)
 511 {
 512     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 513     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec), NULL);
 514     Geom::Point pt2g = to_2geom(p);
 515     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, pt2g);
 516     p = from_2geom(pt2g);
 517 }
 518
 519 static SPCurve *
 520 reverse_then_unref(SPCurve *orig)
 521 {
 522     SPCurve *ret = orig->create_reverse();
 523     orig->unref();
 524     return ret;
 525 }
 526
 527 /**
 528  * Concats red, blue and green.
 529  * If any anchors are defined, process these, optionally removing curves from white list
 530  * Invoke _flush_white to write result back to object.
 531  */
 532 void
 533 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 534 {
 535     /* Concat RBG */
 536     SPCurve *c = dc->green_curve;
 537
 538     /* Green */
 539     dc->green_curve = new SPCurve();
 540     while (dc->green_bpaths) {
 541         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 542         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 543     }
 544     /* Blue */
 545     c->append_continuous(dc->blue_curve, 0.0625);
 546     dc->blue_curve->reset();
 547     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 548     /* Red */
 549     if (dc->red_curve_is_valid) {
 550         c->append_continuous(dc->red_curve, 0.0625);
 551     }
 552     dc->red_curve->reset();
 553     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 554
 555     if (c->is_empty()) {
 556         c->unref();
 557         return;
 558     }
 559
 560     /* Step A - test, whether we ended on green anchor */
 561     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 562         // We hit green anchor, closing Green-Blue-Red
 563         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 564         c->closepath_current();
 565         /* Closed path, just flush */
 566         spdc_flush_white(dc, c);
 567         c->unref();
 568         return;
 569     }
 570
 571     /* Step B - both start and end anchored to same curve */
 572     if ( dc->sa && dc->ea
 573          && ( dc->sa->curve == dc->ea->curve )
 574          && ( ( dc->sa != dc->ea )
 575               || dc->sa->curve->is_closed() ) )
 576     {
 577         // We hit bot start and end of single curve, closing paths
 578         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 579         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 580             c = reverse_then_unref(c);
 581         }
 582         dc->sa->curve->append_continuous(c, 0.0625);
 583         c->unref();
 584         dc->sa->curve->closepath_current();
 585         spdc_flush_white(dc, NULL);
 586         return;
 587     }
 588
 589     /* Step C - test start */
 590     if (dc->sa) {
 591         SPCurve *s = dc->sa->curve;
 592         dc->white_curves = g_slist_remove(dc->white_curves, s);
 593         if (dc->sa->start) {
 594             s = reverse_then_unref(s);
 595         }
 596         s->append_continuous(c, 0.0625);
 597         c->unref();
 598         c = s;
 599     } else /* Step D - test end */ if (dc->ea) {
 600         SPCurve *e = dc->ea->curve;
 601         dc->white_curves = g_slist_remove(dc->white_curves, e);
 602         if (!dc->ea->start) {
 603             e = reverse_then_unref(e);
 604         }
 605         c->append_continuous(e, 0.0625);
 606         e->unref();
 607     }
 608
 609
 610     spdc_flush_white(dc, c);
 611
 612     c->unref();
 613 }
 614
 615 /*
 616  * Flushes white curve(s) and additional curve into object
 617  *
 618  * No cleaning of colored curves - this has to be done by caller
 619  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 620  *
 621  */
 622
 623 static void
 624 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 625 {
 626     SPCurve *c;
 627
 628     if (dc->white_curves) {
 629         g_assert(dc->white_item);
 630         c = SPCurve::concat(dc->white_curves);
 631         g_slist_free(dc->white_curves);
 632         dc->white_curves = NULL;
 633         if (gc) {
 634             c->append(gc, FALSE);
 635         }
 636     } else if (gc) {
 637         c = gc;
 638         c->ref();
 639     } else {
 640         return;
 641     }
 642
 643     /* Now we have to go back to item coordinates at last */
 644     c->transform( dc->white_item
 645                             ? sp_item_dt2i_affine(dc->white_item)
 646                             : to_2geom(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) );
 647
 648     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 649     SPDocument *doc = sp_desktop_document(desktop);
 650     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 651
 652     if ( c && !c->is_empty() ) {
 653         /* We actually have something to write */
 654
 655         bool has_lpe = false;
 656         Inkscape::XML::Node *repr;
 657         if (dc->white_item) {
 658             repr = SP_OBJECT_REPR(dc->white_item);
 659             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 660         } else {
 661             repr = xml_doc->createElement("svg:path");
 662             /* Set style */
 663             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false);
 664         }
 665
 666         gchar *str = sp_svg_write_path( c->get_pathvector() );
 667         g_assert( str != NULL );
 668         if (has_lpe)
 669             repr->setAttribute("inkscape:original-d", str);
 670         else
 671             repr->setAttribute("d", str);
 672         g_free(str);
 673
 674         if (!dc->white_item) {
 675             /* Attach repr */
 676             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 677             dc->selection->set(repr);
 678             Inkscape::GC::release(repr);
 679             item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 680             item->updateRepr();
 681         }
 682
 683
 684         // we finished the path; now apply any waiting LPEs or freehand shapes
 685         spdc_check_for_and_apply_waiting_LPE(dc, dc->selection->singleItem());
 686
 687         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 688                          _("Draw path"));
 689
 690         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 691         // flushed before the selection_modified signal is fired by the previous change, which
 692         // results in the tool losing all of the selected path's curve except that last subpath. To
 693         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 694         // in sync immediately.
 695         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 696     }
 697
 698     c->unref();
 699
 700     /* Flush pending updates */
 701     sp_document_ensure_up_to_date(doc);
 702 }
 703
 704 /**
 705  * Returns FIRST active anchor (the activated one).
 706  */
 707 SPDrawAnchor *
 708 spdc_test_inside(SPDrawContext *dc, NR::Point p)
 709 {
 710     SPDrawAnchor *active = NULL;
 711
 712     /* Test green anchor */
 713     if (dc->green_anchor) {
 714         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 715     }
 716
 717     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 718         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 719         if ( !active && na ) {
 720             active = na;
 721         }
 722     }
 723
 724     return active;
 725 }
 726
 727 static void
 728 spdc_reset_white(SPDrawContext *dc)
 729 {
 730     if (dc->white_item) {
 731         /* We do not hold refcount */
 732         dc->white_item = NULL;
 733     }
 734     while (dc->white_curves) {
 735         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 736         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 737     }
 738     while (dc->white_anchors) {
 739         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 740         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 741     }
 742 }
 743
 744 static void
 745 spdc_free_colors(SPDrawContext *dc)
 746 {
 747     /* Red */
 748     if (dc->red_bpath) {
 749         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 750         dc->red_bpath = NULL;
 751     }
 752     if (dc->red_curve) {
 753         dc->red_curve = dc->red_curve->unref();
 754     }
 755     /* Blue */
 756     if (dc->blue_bpath) {
 757         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 758         dc->blue_bpath = NULL;
 759     }
 760     if (dc->blue_curve) {
 761         dc->blue_curve = dc->blue_curve->unref();
 762     }
 763     /* Green */
 764     while (dc->green_bpaths) {
 765         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 766         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 767     }
 768     if (dc->green_curve) {
 769         dc->green_curve = dc->green_curve->unref();
 770     }
 771     if (dc->green_anchor) {
 772         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 773     }
 774     /* White */
 775     if (dc->white_item) {
 776         /* We do not hold refcount */
 777         dc->white_item = NULL;
 778     }
 779     while (dc->white_curves) {
 780         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 781         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 782     }
 783     while (dc->white_anchors) {
 784         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 785         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 786     }
 787 }
 788
 789
 790 /*
 791   Local Variables:
 792   mode:c++
 793   c-file-style:"stroustrup"
 794   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 795   indent-tabs-mode:nil
 796   fill-column:99
 797   End:
 798 */
 799 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :