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 "prefs-utils.h"
  39 #include "selection.h"
  40 #include "selection-chemistry.h"
  41 #include "snap.h"
  42 #include "sp-path.h"
  43 #include "sp-namedview.h"
  44 #include "live_effects/lpe-patternalongpath.h"
  45 #include "style.h"
  46
  47 static void sp_draw_context_class_init(SPDrawContextClass *klass);
  48 static void sp_draw_context_init(SPDrawContext *dc);
  49 static void sp_draw_context_dispose(GObject *object);
  50
  51 static void sp_draw_context_setup(SPEventContext *ec);
  52 static void sp_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *value);
  53 static void sp_draw_context_finish(SPEventContext *ec);
  54
  55 static gint sp_draw_context_root_handler(SPEventContext *event_context, GdkEvent *event);
  56
  57 static void spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc);
  58 static void spdc_selection_modified(Inkscape::Selection *sel, guint flags, SPDrawContext *dc);
  59
  60 static void spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection *sel);
  61
  62 static void spdc_flush_white(SPDrawContext *dc, SPCurve *gc);
  63
  64 static void spdc_reset_white(SPDrawContext *dc);
  65 static void spdc_free_colors(SPDrawContext *dc);
  66
  67
  68 static SPEventContextClass *draw_parent_class;
  69
  70
  71 GType
  72 sp_draw_context_get_type(void)
  73 {
  74     static GType type = 0;
  75     if (!type) {
  76         GTypeInfo info = {
  77             sizeof(SPDrawContextClass),
  78             NULL, NULL,
  79             (GClassInitFunc) sp_draw_context_class_init,
  80             NULL, NULL,
  81             sizeof(SPDrawContext),
  82             4,
  83             (GInstanceInitFunc) sp_draw_context_init,
  84             NULL,   /* value_table */
  85         };
  86         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDrawContext", &info, (GTypeFlags)0);
  87     }
  88     return type;
  89 }
  90
  91 static void
  92 sp_draw_context_class_init(SPDrawContextClass *klass)
  93 {
  94     GObjectClass *object_class;
  95     SPEventContextClass *ec_class;
  96
  97     object_class = (GObjectClass *)klass;
  98     ec_class = (SPEventContextClass *) klass;
  99
 100     draw_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 101
 102     object_class->dispose = sp_draw_context_dispose;
 103
 104     ec_class->setup = sp_draw_context_setup;
 105     ec_class->set = sp_draw_context_set;
 106     ec_class->finish = sp_draw_context_finish;
 107     ec_class->root_handler = sp_draw_context_root_handler;
 108 }
 109
 110 static void
 111 sp_draw_context_init(SPDrawContext *dc)
 112 {
 113     dc->attach = FALSE;
 114
 115     dc->red_color = 0xff00007f;
 116     dc->blue_color = 0x0000ff7f;
 117     dc->green_color = 0x00ff007f;
 118     dc->red_curve_is_valid = false;
 119
 120     dc->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*/, const gchar */*key*/, const gchar */*value*/)
 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 char 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
 296     if (item && SP_IS_LPE_ITEM(item)) {
 297         if (prefs_get_int_attribute(tool_name(dc), "freehand-mode", 0) == 1) {
 298             Effect::createAndApply(SPIRO, dc->desktop->doc(), item);
 299         }
 300
 301         int shape = prefs_get_int_attribute(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 100
 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(FREEHAND_SHAPE, 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             sp_repr_css_set_property (css, "fill", cstroke);
 376             sp_repr_css_set_property (css, "stroke", "none");
 377             sp_desktop_apply_css_recursive(SP_OBJECT(item), css, true);
 378             sp_repr_css_attr_unref(css);
 379             return;
 380         }
 381
 382         if (dc->waiting_LPE_type != INVALID_LPE) {
 383             Effect::createAndApply(dc->waiting_LPE_type, dc->desktop->doc(), item);
 384             dc->waiting_LPE_type = INVALID_LPE;
 385
 386             if (SP_IS_LPETOOL_CONTEXT(dc)) {
 387                 // since a geometric LPE was applied, we switch back to "inactive" mode
 388                 lpetool_context_switch_mode(SP_LPETOOL_CONTEXT(dc), Inkscape::LivePathEffect::INVALID_LPE);
 389             }
 390         }
 391         if (SP_IS_PEN_CONTEXT(dc)) {
 392             sp_pen_context_set_polyline_mode(SP_PEN_CONTEXT(dc));
 393         }
 394     }
 395 }
 396
 397 /*
 398  * Selection handlers
 399  */
 400
 401 static void
 402 spdc_selection_changed(Inkscape::Selection *sel, SPDrawContext *dc)
 403 {
 404     if (dc->attach) {
 405         spdc_attach_selection(dc, sel);
 406     }
 407 }
 408
 409 /* fixme: We have to ensure this is not delayed (Lauris) */
 410
 411 static void
 412 spdc_selection_modified(Inkscape::Selection *sel, guint /*flags*/, SPDrawContext *dc)
 413 {
 414     if (dc->attach) {
 415         spdc_attach_selection(dc, sel);
 416     }
 417 }
 418
 419 static void
 420 spdc_attach_selection(SPDrawContext *dc, Inkscape::Selection */*sel*/)
 421 {
 422     /* We reset white and forget white/start/end anchors */
 423     spdc_reset_white(dc);
 424     dc->sa = NULL;
 425     dc->ea = NULL;
 426
 427     SPItem *item = dc->selection ? dc->selection->singleItem() : NULL;
 428
 429     if ( item && SP_IS_PATH(item) ) {
 430         /* Create new white data */
 431         /* Item */
 432         dc->white_item = item;
 433         /* Curve list */
 434         /* We keep it in desktop coordinates to eliminate calculation errors */
 435         SPCurve *norm = sp_path_get_curve_for_edit (SP_PATH(item));
 436         norm->transform(sp_item_i2d_affine(dc->white_item));
 437         g_return_if_fail( norm != NULL );
 438         dc->white_curves = g_slist_reverse(norm->split());
 439         norm->unref();
 440         /* Anchor list */
 441         for (GSList *l = dc->white_curves; l != NULL; l = l->next) {
 442             SPCurve *c;
 443             c = (SPCurve*)l->data;
 444             g_return_if_fail( c->get_segment_count() > 0 );
 445             if ( !c->is_closed() ) {
 446                 SPDrawAnchor *a;
 447                 a = sp_draw_anchor_new(dc, c, TRUE, *(c->first_point()));
 448                 if (a)
 449                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 450                 a = sp_draw_anchor_new(dc, c, FALSE, *(c->last_point()));
 451                 if (a)
 452                     dc->white_anchors = g_slist_prepend(dc->white_anchors, a);
 453             }
 454         }
 455         /* fixme: recalculate active anchor? */
 456     }
 457 }
 458
 459
 460 /**
 461  *  Snaps node or handle to PI/rotationsnapsperpi degree increments.
 462  *
 463  *  \param dc draw context
 464  *  \param p cursor point (to be changed by snapping)
 465  *  \param o origin point
 466  *  \param state  keyboard state to check if ctrl was pressed
 467 */
 468
 469 void spdc_endpoint_snap_rotation(SPEventContext const *const ec, Geom::Point &p, Geom::Point const &o,
 470                                  guint state)
 471 {
 472     unsigned const snaps = abs(prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12));
 473     /* 0 means no snapping. */
 474
 475     /* mirrored by fabs, so this corresponds to 15 degrees */
 476     Geom::Point best; /* best solution */
 477     double bn = NR_HUGE; /* best normal */
 478     double bdot = 0;
 479     Geom::Point v = Geom::Point(0, 1);
 480     double const r00 = cos(M_PI / snaps), r01 = sin(M_PI / snaps);
 481     double const r10 = -r01, r11 = r00;
 482
 483     Geom::Point delta = p - o;
 484
 485     for (unsigned i = 0; i < snaps; i++) {
 486         double const ndot = fabs(dot(v,Geom::rot90(delta)));
 487         Geom::Point t(r00*v[NR::X] + r01*v[NR::Y],
 488                     r10*v[NR::X] + r11*v[NR::Y]);
 489         if (ndot < bn) {
 490             /* I think it is better numerically to use the normal, rather than the dot product
 491              * to assess solutions, but I haven't proven it. */
 492             bn = ndot;
 493             best = v;
 494             bdot = dot(v, delta);
 495         }
 496         v = t;
 497     }
 498
 499     if (fabs(bdot) > 0) {
 500         p = o + bdot * best;
 501
 502         if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
 503                                          //After all, the user explicitely asked for angular snapping by
 504                                          //pressing CTRL
 505             /* Snap it along best vector */
 506             SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 507             m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 508             Geom::Point pt2g = to_2geom(p);
 509             m.constrainedSnapReturnByRef( Inkscape::Snapper::SNAPPOINT_NODE, pt2g, Inkscape::Snapper::ConstraintLine(best));
 510             p = from_2geom(pt2g);
 511         }
 512     }
 513 }
 514
 515
 516 void spdc_endpoint_snap_free(SPEventContext const * const ec, Geom::Point& p, guint const /*state*/)
 517 {
 518     SnapManager &m = SP_EVENT_CONTEXT_DESKTOP(ec)->namedview->snap_manager;
 519     m.setup(SP_EVENT_CONTEXT_DESKTOP(ec));
 520     Geom::Point pt2g = to_2geom(p);
 521     m.freeSnapReturnByRef(Inkscape::Snapper::SNAPPOINT_NODE, pt2g);
 522     p = from_2geom(pt2g);
 523 }
 524
 525 static SPCurve *
 526 reverse_then_unref(SPCurve *orig)
 527 {
 528     SPCurve *ret = orig->create_reverse();
 529     orig->unref();
 530     return ret;
 531 }
 532
 533 /**
 534  * Concats red, blue and green.
 535  * If any anchors are defined, process these, optionally removing curves from white list
 536  * Invoke _flush_white to write result back to object.
 537  */
 538 void
 539 spdc_concat_colors_and_flush(SPDrawContext *dc, gboolean forceclosed)
 540 {
 541     /* Concat RBG */
 542     SPCurve *c = dc->green_curve;
 543
 544     /* Green */
 545     dc->green_curve = new SPCurve();
 546     while (dc->green_bpaths) {
 547         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 548         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 549     }
 550     /* Blue */
 551     c->append_continuous(dc->blue_curve, 0.0625);
 552     dc->blue_curve->reset();
 553     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->blue_bpath), NULL);
 554     /* Red */
 555     if (dc->red_curve_is_valid) {
 556         c->append_continuous(dc->red_curve, 0.0625);
 557     }
 558     dc->red_curve->reset();
 559     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->red_bpath), NULL);
 560
 561     if (c->is_empty()) {
 562         c->unref();
 563         return;
 564     }
 565
 566     /* Step A - test, whether we ended on green anchor */
 567     if ( forceclosed || ( dc->green_anchor && dc->green_anchor->active ) ) {
 568         // We hit green anchor, closing Green-Blue-Red
 569         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Path is closed."));
 570         c->closepath_current();
 571         /* Closed path, just flush */
 572         spdc_flush_white(dc, c);
 573         c->unref();
 574         return;
 575     }
 576
 577     /* Step B - both start and end anchored to same curve */
 578     if ( dc->sa && dc->ea
 579          && ( dc->sa->curve == dc->ea->curve )
 580          && ( ( dc->sa != dc->ea )
 581               || dc->sa->curve->is_closed() ) )
 582     {
 583         // We hit bot start and end of single curve, closing paths
 584         SP_EVENT_CONTEXT_DESKTOP(dc)->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Closing path."));
 585         if (dc->sa->start && !(dc->sa->curve->is_closed()) ) {
 586             c = reverse_then_unref(c);
 587         }
 588         dc->sa->curve->append_continuous(c, 0.0625);
 589         c->unref();
 590         dc->sa->curve->closepath_current();
 591         spdc_flush_white(dc, NULL);
 592         return;
 593     }
 594
 595     /* Step C - test start */
 596     if (dc->sa) {
 597         SPCurve *s = dc->sa->curve;
 598         dc->white_curves = g_slist_remove(dc->white_curves, s);
 599         if (dc->sa->start) {
 600             s = reverse_then_unref(s);
 601         }
 602         s->append_continuous(c, 0.0625);
 603         c->unref();
 604         c = s;
 605     } else /* Step D - test end */ if (dc->ea) {
 606         SPCurve *e = dc->ea->curve;
 607         dc->white_curves = g_slist_remove(dc->white_curves, e);
 608         if (!dc->ea->start) {
 609             e = reverse_then_unref(e);
 610         }
 611         c->append_continuous(e, 0.0625);
 612         e->unref();
 613     }
 614
 615
 616     spdc_flush_white(dc, c);
 617
 618     c->unref();
 619 }
 620
 621 /*
 622  * Flushes white curve(s) and additional curve into object
 623  *
 624  * No cleaning of colored curves - this has to be done by caller
 625  * No rereading of white data, so if you cannot rely on ::modified, do it in caller
 626  *
 627  */
 628
 629 static void
 630 spdc_flush_white(SPDrawContext *dc, SPCurve *gc)
 631 {
 632     SPCurve *c;
 633
 634     if (dc->white_curves) {
 635         g_assert(dc->white_item);
 636         c = SPCurve::concat(dc->white_curves);
 637         g_slist_free(dc->white_curves);
 638         dc->white_curves = NULL;
 639         if (gc) {
 640             c->append(gc, FALSE);
 641         }
 642     } else if (gc) {
 643         c = gc;
 644         c->ref();
 645     } else {
 646         return;
 647     }
 648
 649     /* Now we have to go back to item coordinates at last */
 650     c->transform( dc->white_item
 651                             ? sp_item_dt2i_affine(dc->white_item)
 652                             : to_2geom(sp_desktop_dt2root_affine(SP_EVENT_CONTEXT_DESKTOP(dc))) );
 653
 654     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 655     SPDocument *doc = sp_desktop_document(desktop);
 656     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(doc);
 657
 658     if ( c && !c->is_empty() ) {
 659         /* We actually have something to write */
 660
 661         bool has_lpe = false;
 662         Inkscape::XML::Node *repr;
 663         if (dc->white_item) {
 664             repr = SP_OBJECT_REPR(dc->white_item);
 665             has_lpe = sp_lpe_item_has_path_effect_recursive(SP_LPE_ITEM(dc->white_item));
 666         } else {
 667             repr = xml_doc->createElement("svg:path");
 668             /* Set style */
 669             sp_desktop_apply_style_tool(desktop, repr, tool_name(dc), false);
 670         }
 671
 672         gchar *str = sp_svg_write_path( c->get_pathvector() );
 673         g_assert( str != NULL );
 674         if (has_lpe)
 675             repr->setAttribute("inkscape:original-d", str);
 676         else
 677             repr->setAttribute("d", str);
 678         g_free(str);
 679
 680         if (!dc->white_item) {
 681             /* Attach repr */
 682             SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 683
 684             // we finished the path; now apply any waiting LPEs or freehand shapes
 685             spdc_check_for_and_apply_waiting_LPE(dc, item);
 686
 687             dc->selection->set(repr);
 688             Inkscape::GC::release(repr);
 689             item->transform = i2i_affine(desktop->currentRoot(), desktop->currentLayer());
 690             item->updateRepr();
 691         }
 692
 693         sp_document_done(doc, SP_IS_PEN_CONTEXT(dc)? SP_VERB_CONTEXT_PEN : SP_VERB_CONTEXT_PENCIL,
 694                          _("Draw path"));
 695
 696         // When quickly drawing several subpaths with Shift, the next subpath may be finished and
 697         // flushed before the selection_modified signal is fired by the previous change, which
 698         // results in the tool losing all of the selected path's curve except that last subpath. To
 699         // fix this, we force the selection_modified callback now, to make sure the tool's curve is
 700         // in sync immediately.
 701         spdc_selection_modified(sp_desktop_selection(desktop), 0, dc);
 702     }
 703
 704     c->unref();
 705
 706     /* Flush pending updates */
 707     sp_document_ensure_up_to_date(doc);
 708 }
 709
 710 /**
 711  * Returns FIRST active anchor (the activated one).
 712  */
 713 SPDrawAnchor *
 714 spdc_test_inside(SPDrawContext *dc, Geom::Point p)
 715 {
 716     SPDrawAnchor *active = NULL;
 717
 718     /* Test green anchor */
 719     if (dc->green_anchor) {
 720         active = sp_draw_anchor_test(dc->green_anchor, p, TRUE);
 721     }
 722
 723     for (GSList *l = dc->white_anchors; l != NULL; l = l->next) {
 724         SPDrawAnchor *na = sp_draw_anchor_test((SPDrawAnchor *) l->data, p, !active);
 725         if ( !active && na ) {
 726             active = na;
 727         }
 728     }
 729
 730     return active;
 731 }
 732
 733 static void
 734 spdc_reset_white(SPDrawContext *dc)
 735 {
 736     if (dc->white_item) {
 737         /* We do not hold refcount */
 738         dc->white_item = NULL;
 739     }
 740     while (dc->white_curves) {
 741         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 742         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 743     }
 744     while (dc->white_anchors) {
 745         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 746         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 747     }
 748 }
 749
 750 static void
 751 spdc_free_colors(SPDrawContext *dc)
 752 {
 753     /* Red */
 754     if (dc->red_bpath) {
 755         gtk_object_destroy(GTK_OBJECT(dc->red_bpath));
 756         dc->red_bpath = NULL;
 757     }
 758     if (dc->red_curve) {
 759         dc->red_curve = dc->red_curve->unref();
 760     }
 761     /* Blue */
 762     if (dc->blue_bpath) {
 763         gtk_object_destroy(GTK_OBJECT(dc->blue_bpath));
 764         dc->blue_bpath = NULL;
 765     }
 766     if (dc->blue_curve) {
 767         dc->blue_curve = dc->blue_curve->unref();
 768     }
 769     /* Green */
 770     while (dc->green_bpaths) {
 771         gtk_object_destroy(GTK_OBJECT(dc->green_bpaths->data));
 772         dc->green_bpaths = g_slist_remove(dc->green_bpaths, dc->green_bpaths->data);
 773     }
 774     if (dc->green_curve) {
 775         dc->green_curve = dc->green_curve->unref();
 776     }
 777     if (dc->green_anchor) {
 778         dc->green_anchor = sp_draw_anchor_destroy(dc->green_anchor);
 779     }
 780     /* White */
 781     if (dc->white_item) {
 782         /* We do not hold refcount */
 783         dc->white_item = NULL;
 784     }
 785     while (dc->white_curves) {
 786         reinterpret_cast<SPCurve *>(dc->white_curves->data)->unref();
 787         dc->white_curves = g_slist_remove(dc->white_curves, dc->white_curves->data);
 788     }
 789     while (dc->white_anchors) {
 790         sp_draw_anchor_destroy((SPDrawAnchor *) dc->white_anchors->data);
 791         dc->white_anchors = g_slist_remove(dc->white_anchors, dc->white_anchors->data);
 792     }
 793 }
 794
 795 /* Create a single dot represented by a circle */
 796 void spdc_create_single_dot(SPEventContext *ec, Geom::Point const &pt, char const *tool, guint event_state) {
 797     g_return_if_fail(!strcmp(tool, "tools.freehand.pen") || !strcmp(tool, "tools.freehand.pencil"));
 798
 799     SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(ec);
 800     Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 801     Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 802     repr->setAttribute("sodipodi:type", "arc");
 803     SPItem *item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
 804     Inkscape::GC::release(repr);
 805
 806     /* apply the tool's current style */
 807     sp_desktop_apply_style_tool(desktop, repr, tool, false);
 808
 809     /* find out stroke width (TODO: is there an easier way??) */
 810     double stroke_width = 3.0;
 811     gchar const *style_str = NULL;
 812     style_str = repr->attribute("style");
 813     if (style_str) {
 814         SPStyle *style = sp_style_new(SP_ACTIVE_DOCUMENT);
 815         sp_style_merge_from_style_string(style, style_str);
 816         stroke_width = style->stroke_width.computed;
 817         style->stroke_width.computed = 0;
 818         sp_style_unref(style);
 819     }
 820     /* unset stroke and set fill color to former stroke color */
 821     gchar * str;
 822     str = g_strdup_printf("fill:#%06x;stroke:none;", sp_desktop_get_color_tool(desktop, tool, false) >> 8);
 823     repr->setAttribute("style", str);
 824     g_free(str);
 825
 826     /* put the circle where the mouse click occurred and set the diameter to the
 827        current stroke width, multiplied by the amount specified in the preferences */
 828     Geom::Matrix const i2d (sp_item_i2d_affine (item));
 829     Geom::Point pp = pt * i2d;
 830     double rad = 0.5 * prefs_get_double_attribute(tool, "dot-size", 3.0);
 831     if (event_state & GDK_MOD1_MASK) {
 832         /* TODO: We vary the dot size between 0.5*rad and 1.5*rad, where rad is the dot size
 833            as specified in prefs. Very simple, but it might be sufficient in practice. If not,
 834            we need to devise something more sophisticated. */
 835         double s = g_random_double_range(-0.5, 0.5);
 836         rad *= (1 + s);
 837     }
 838     if (event_state & GDK_SHIFT_MASK) {
 839         // double the point size
 840         rad *= 2;
 841     }
 842
 843     sp_repr_set_svg_double (repr, "sodipodi:cx", pp[NR::X]);
 844     sp_repr_set_svg_double (repr, "sodipodi:cy", pp[NR::Y]);
 845     sp_repr_set_svg_double (repr, "sodipodi:rx", rad * stroke_width);
 846     sp_repr_set_svg_double (repr, "sodipodi:ry", rad * stroke_width);
 847     item->updateRepr();
 848
 849     sp_desktop_selection(desktop)->set(item);
 850
 851     desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating single dot"));
 852     sp_document_done(sp_desktop_document(desktop), SP_VERB_NONE, _("Create single dot"));
 853 }
 854
 855 /*
 856   Local Variables:
 857   mode:c++
 858   c-file-style:"stroustrup"
 859   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 860   indent-tabs-mode:nil
 861   fill-column:99
 862   End:
 863 */
 864 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :