src/eraser-context.cpp

   1 /*
   2  * Eraser drawing mode
   3  *
   4  * Authors:
   5  *   Mitsuru Oka <oka326@parkcity.ne.jp>
   6  *   Lauris Kaplinski <lauris@kaplinski.com>
   7  *   bulia byak <buliabyak@users.sf.net>
   8  *   MenTaLguY <mental@rydia.net>
   9  *   Jon A. Cruz <jon@joncruz.org>
  10  *
  11  * The original dynadraw code:
  12  *   Paul Haeberli <paul@sgi.com>
  13  *
  14  * Copyright (C) 1998 The Free Software Foundation
  15  * Copyright (C) 1999-2005 authors
  16  * Copyright (C) 2001-2002 Ximian, Inc.
  17  * Copyright (C) 2005-2007 bulia byak
  18  * Copyright (C) 2006 MenTaLguY
  19  * Copyright (C) 2008 Jon A. Cruz
  20  *
  21  * Released under GNU GPL, read the file 'COPYING' for more information
  22  */
  23
  24 #define noERASER_VERBOSE
  25
  26 #include "config.h"
  27
  28 #include <gtk/gtk.h>
  29 #include <gdk/gdkkeysyms.h>
  30 #include <glibmm/i18n.h>
  31 #include <string>
  32 #include <cstring>
  33 #include <numeric>
  34
  35 #include "svg/svg.h"
  36 #include "display/canvas-bpath.h"
  37 #include "display/bezier-utils.h"
  38
  39 #include <glib/gmem.h>
  40 #include "macros.h"
  41 #include "document.h"
  42 #include "selection.h"
  43 #include "desktop.h"
  44 #include "desktop-events.h"
  45 #include "desktop-handles.h"
  46 #include "desktop-affine.h"
  47 #include "desktop-style.h"
  48 #include "message-context.h"
  49 #include "prefs-utils.h"
  50 #include "pixmaps/cursor-eraser.xpm"
  51 #include "libnr/n-art-bpath.h"
  52 #include "libnr/nr-path.h"
  53 #include "libnr/nr-matrix-ops.h"
  54 #include "libnr/nr-scale-translate-ops.h"
  55 #include "xml/repr.h"
  56 #include "context-fns.h"
  57 #include "sp-item.h"
  58 #include "inkscape.h"
  59 #include "color.h"
  60 #include "rubberband.h"
  61 #include "splivarot.h"
  62 #include "sp-item-group.h"
  63 #include "sp-shape.h"
  64 #include "sp-path.h"
  65 #include "sp-text.h"
  66 #include "display/canvas-bpath.h"
  67 #include "display/canvas-arena.h"
  68 #include "livarot/Shape.h"
  69 #include "isnan.h"
  70
  71 #include "eraser-context.h"
  72
  73 #define ERC_RED_RGBA 0xff0000ff
  74
  75 #define TOLERANCE_ERASER 0.1
  76
  77 #define ERASER_EPSILON 0.5e-6
  78 #define ERASER_EPSILON_START 0.5e-2
  79 #define ERASER_VEL_START 1e-5
  80
  81 #define DRAG_MIN 0.0
  82 #define DRAG_DEFAULT 1.0
  83 #define DRAG_MAX 1.0
  84
  85
  86 static void sp_eraser_context_class_init(SPEraserContextClass *klass);
  87 static void sp_eraser_context_init(SPEraserContext *erc);
  88 static void sp_eraser_context_dispose(GObject *object);
  89
  90 static void sp_eraser_context_setup(SPEventContext *ec);
  91 static void sp_eraser_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  92 static gint sp_eraser_context_root_handler(SPEventContext *ec, GdkEvent *event);
  93
  94 static void clear_current(SPEraserContext *dc);
  95 static void set_to_accumulated(SPEraserContext *dc);
  96 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
  97 static void accumulate_eraser(SPEraserContext *dc);
  98
  99 static void fit_and_split(SPEraserContext *erc, gboolean release);
 100
 101 static void sp_eraser_reset(SPEraserContext *erc, NR::Point p);
 102 static NR::Point sp_eraser_get_npoint(SPEraserContext const *erc, NR::Point v);
 103 static NR::Point sp_eraser_get_vpoint(SPEraserContext const *erc, NR::Point n);
 104 static void draw_temporary_box(SPEraserContext *dc);
 105
 106
 107 static SPEventContextClass *parent_class;
 108
 109 GtkType
 110 sp_eraser_context_get_type(void)
 111 {
 112     static GType type = 0;
 113     if (!type) {
 114         GTypeInfo info = {
 115             sizeof(SPEraserContextClass),
 116             NULL, NULL,
 117             (GClassInitFunc) sp_eraser_context_class_init,
 118             NULL, NULL,
 119             sizeof(SPEraserContext),
 120             4,
 121             (GInstanceInitFunc) sp_eraser_context_init,
 122             NULL,   /* value_table */
 123         };
 124         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPEraserContext", &info, (GTypeFlags)0);
 125     }
 126     return type;
 127 }
 128
 129 static void
 130 sp_eraser_context_class_init(SPEraserContextClass *klass)
 131 {
 132     GObjectClass *object_class = (GObjectClass *) klass;
 133     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 134
 135     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 136
 137     object_class->dispose = sp_eraser_context_dispose;
 138
 139     event_context_class->setup = sp_eraser_context_setup;
 140     event_context_class->set = sp_eraser_context_set;
 141     event_context_class->root_handler = sp_eraser_context_root_handler;
 142 }
 143
 144 static void
 145 sp_eraser_context_init(SPEraserContext *erc)
 146 {
 147     SPEventContext *event_context = SP_EVENT_CONTEXT(erc);
 148
 149     event_context->cursor_shape = cursor_eraser_xpm;
 150     event_context->hot_x = 4;
 151     event_context->hot_y = 4;
 152
 153     erc->accumulated = NULL;
 154     erc->segments = NULL;
 155     erc->currentcurve = NULL;
 156     erc->currentshape = NULL;
 157     erc->npoints = 0;
 158     erc->cal1 = NULL;
 159     erc->cal2 = NULL;
 160     erc->repr = NULL;
 161
 162     /* Eraser values */
 163     erc->cur = NR::Point(0,0);
 164     erc->last = NR::Point(0,0);
 165     erc->vel = NR::Point(0,0);
 166     erc->vel_max = 0;
 167     erc->acc = NR::Point(0,0);
 168     erc->ang = NR::Point(0,0);
 169     erc->del = NR::Point(0,0);
 170
 171     /* attributes */
 172     erc->dragging = FALSE;
 173
 174     erc->mass = 0.3;
 175     erc->drag = DRAG_DEFAULT;
 176     erc->angle = 30.0;
 177     erc->width = 0.2;
 178     erc->pressure = ERC_DEFAULT_PRESSURE;
 179
 180     erc->vel_thin = 0.1;
 181     erc->flatness = 0.9;
 182     erc->cap_rounding = 0.0;
 183
 184     erc->abs_width = false;
 185 }
 186
 187 static void
 188 sp_eraser_context_dispose(GObject *object)
 189 {
 190     SPEraserContext *erc = SP_ERASER_CONTEXT(object);
 191
 192     if (erc->accumulated) {
 193         erc->accumulated = sp_curve_unref(erc->accumulated);
 194     }
 195
 196     while (erc->segments) {
 197         gtk_object_destroy(GTK_OBJECT(erc->segments->data));
 198         erc->segments = g_slist_remove(erc->segments, erc->segments->data);
 199     }
 200
 201     if (erc->currentcurve) erc->currentcurve = sp_curve_unref(erc->currentcurve);
 202     if (erc->cal1) erc->cal1 = sp_curve_unref(erc->cal1);
 203     if (erc->cal2) erc->cal2 = sp_curve_unref(erc->cal2);
 204
 205     if (erc->currentshape) {
 206         gtk_object_destroy(GTK_OBJECT(erc->currentshape));
 207         erc->currentshape = 0;
 208     }
 209
 210     if (erc->_message_context) {
 211         delete erc->_message_context;
 212         erc->_message_context = 0;
 213     }
 214
 215     G_OBJECT_CLASS(parent_class)->dispose(object);
 216 }
 217
 218 static void
 219 sp_eraser_context_setup(SPEventContext *ec)
 220 {
 221     SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
 222
 223     if (((SPEventContextClass *) parent_class)->setup)
 224         ((SPEventContextClass *) parent_class)->setup(ec);
 225
 226     erc->accumulated = sp_curve_new_sized(32);
 227     erc->currentcurve = sp_curve_new_sized(4);
 228
 229     erc->cal1 = sp_curve_new_sized(32);
 230     erc->cal2 = sp_curve_new_sized(32);
 231
 232     erc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
 233     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(erc->currentshape), ERC_RED_RGBA, SP_WIND_RULE_EVENODD);
 234     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(erc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 235     /* fixme: Cannot we cascade it to root more clearly? */
 236     g_signal_connect(G_OBJECT(erc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
 237
 238 /*
 239 static ProfileFloatElement f_profile[PROFILE_FLOAT_SIZE] = {
 240     {"mass",0.02, 0.0, 1.0},
 241     {"wiggle",0.0, 0.0, 1.0},
 242     {"angle",30.0, -90.0, 90.0},
 243     {"thinning",0.1, -1.0, 1.0},
 244     {"tremor",0.0, 0.0, 1.0},
 245     {"flatness",0.9, 0.0, 1.0},
 246     {"cap_rounding",0.0, 0.0, 5.0}
 247 };
 248 */
 249
 250     sp_event_context_read(ec, "mass");
 251     sp_event_context_read(ec, "wiggle");
 252     sp_event_context_read(ec, "angle");
 253     sp_event_context_read(ec, "width");
 254     sp_event_context_read(ec, "thinning");
 255     sp_event_context_read(ec, "tremor");
 256     sp_event_context_read(ec, "flatness");
 257     sp_event_context_read(ec, "tracebackground");
 258     sp_event_context_read(ec, "usepressure");
 259     sp_event_context_read(ec, "usetilt");
 260     sp_event_context_read(ec, "abs_width");
 261     sp_event_context_read(ec, "cap_rounding");
 262
 263     erc->is_drawing = false;
 264
 265     erc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 266
 267     if (prefs_get_int_attribute("tools.eraser", "selcue", 0) != 0) {
 268         ec->enableSelectionCue();
 269     }
 270 // TODO temp force:
 271     ec->enableSelectionCue();
 272
 273 }
 274
 275 static void
 276 sp_eraser_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 277 {
 278     SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
 279
 280     if (!strcmp(key, "mass")) {
 281         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
 282         erc->mass = CLAMP(dval, -1000.0, 1000.0);
 283     } else if (!strcmp(key, "wiggle")) {
 284         double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
 285         erc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
 286     } else if (!strcmp(key, "angle")) {
 287         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
 288         erc->angle = CLAMP (dval, -90, 90);
 289     } else if (!strcmp(key, "width")) {
 290         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 291         erc->width = CLAMP(dval, -1000.0, 1000.0);
 292     } else if (!strcmp(key, "thinning")) {
 293         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 294         erc->vel_thin = CLAMP(dval, -1.0, 1.0);
 295     } else if (!strcmp(key, "tremor")) {
 296         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 297         erc->tremor = CLAMP(dval, 0.0, 1.0);
 298     } else if (!strcmp(key, "flatness")) {
 299         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 300         erc->flatness = CLAMP(dval, 0, 1.0);
 301     } else if (!strcmp(key, "usepressure")) {
 302         erc->usepressure = (val && strcmp(val, "0"));
 303     } else if (!strcmp(key, "usetilt")) {
 304         erc->usetilt = (val && strcmp(val, "0"));
 305     } else if (!strcmp(key, "abs_width")) {
 306         erc->abs_width = (val && strcmp(val, "0"));
 307     } else if (!strcmp(key, "cap_rounding")) {
 308         erc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 309     }
 310
 311     //g_print("ERC: %g %g %g %g\n", erc->mass, erc->drag, erc->angle, erc->width);
 312 }
 313
 314 static double
 315 flerp(double f0, double f1, double p)
 316 {
 317     return f0 + ( f1 - f0 ) * p;
 318 }
 319
 320 /* Get normalized point */
 321 static NR::Point
 322 sp_eraser_get_npoint(SPEraserContext const *dc, NR::Point v)
 323 {
 324     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 325     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 326     return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max,  ( v[NR::Y] - drect.min()[NR::Y] ) / max);
 327 }
 328
 329 /* Get view point */
 330 static NR::Point
 331 sp_eraser_get_vpoint(SPEraserContext const *dc, NR::Point n)
 332 {
 333     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 334     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 335     return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
 336 }
 337
 338 static void
 339 sp_eraser_reset(SPEraserContext *dc, NR::Point p)
 340 {
 341     dc->last = dc->cur = sp_eraser_get_npoint(dc, p);
 342     dc->vel = NR::Point(0,0);
 343     dc->vel_max = 0;
 344     dc->acc = NR::Point(0,0);
 345     dc->ang = NR::Point(0,0);
 346     dc->del = NR::Point(0,0);
 347 }
 348
 349 static void
 350 sp_eraser_extinput(SPEraserContext *dc, GdkEvent *event)
 351 {
 352     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
 353         dc->pressure = CLAMP (dc->pressure, ERC_MIN_PRESSURE, ERC_MAX_PRESSURE);
 354     else
 355         dc->pressure = ERC_DEFAULT_PRESSURE;
 356
 357     if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
 358         dc->xtilt = CLAMP (dc->xtilt, ERC_MIN_TILT, ERC_MAX_TILT);
 359     else
 360         dc->xtilt = ERC_DEFAULT_TILT;
 361
 362     if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
 363         dc->ytilt = CLAMP (dc->ytilt, ERC_MIN_TILT, ERC_MAX_TILT);
 364     else
 365         dc->ytilt = ERC_DEFAULT_TILT;
 366 }
 367
 368
 369 static gboolean
 370 sp_eraser_apply(SPEraserContext *dc, NR::Point p)
 371 {
 372     NR::Point n = sp_eraser_get_npoint(dc, p);
 373
 374     /* Calculate mass and drag */
 375     double const mass = flerp(1.0, 160.0, dc->mass);
 376     double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
 377
 378     /* Calculate force and acceleration */
 379     NR::Point force = n - dc->cur;
 380
 381     // If force is below the absolute threshold ERASER_EPSILON,
 382     // or we haven't yet reached ERASER_VEL_START (i.e. at the beginning of stroke)
 383     // _and_ the force is below the (higher) ERASER_EPSILON_START threshold,
 384     // discard this move.
 385     // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
 386     // especially bothersome at the start of the stroke where we don't yet have the inertia to
 387     // smooth them out.
 388     if ( NR::L2(force) < ERASER_EPSILON || (dc->vel_max < ERASER_VEL_START && NR::L2(force) < ERASER_EPSILON_START)) {
 389         return FALSE;
 390     }
 391
 392     dc->acc = force / mass;
 393
 394     /* Calculate new velocity */
 395     dc->vel += dc->acc;
 396
 397     if (NR::L2(dc->vel) > dc->vel_max)
 398         dc->vel_max = NR::L2(dc->vel);
 399
 400     /* Calculate angle of drawing tool */
 401
 402     double a1;
 403     if (dc->usetilt) {
 404         // 1a. calculate nib angle from input device tilt:
 405         gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
 406
 407         if (length > 0) {
 408             NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
 409             a1 = atan2(ang1);
 410         }
 411         else
 412             a1 = 0.0;
 413     }
 414     else {
 415         // 1b. fixed dc->angle (absolutely flat nib):
 416         double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
 417         NR::Point ang1 = NR::Point(-sin(radians),  cos(radians));
 418         a1 = atan2(ang1);
 419     }
 420
 421     // 2. perpendicular to dc->vel (absolutely non-flat nib):
 422     gdouble const mag_vel = NR::L2(dc->vel);
 423     if ( mag_vel < ERASER_EPSILON ) {
 424         return FALSE;
 425     }
 426     NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
 427
 428     // 3. Average them using flatness parameter:
 429     // calculate angles
 430     double a2 = atan2(ang2);
 431     // flip a2 to force it to be in the same half-circle as a1
 432     bool flipped = false;
 433     if (fabs (a2-a1) > 0.5*M_PI) {
 434         a2 += M_PI;
 435         flipped = true;
 436     }
 437     // normalize a2
 438     if (a2 > M_PI)
 439         a2 -= 2*M_PI;
 440     if (a2 < -M_PI)
 441         a2 += 2*M_PI;
 442     // find the flatness-weighted bisector angle, unflip if a2 was flipped
 443     // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
 444     double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
 445
 446     // Try to detect a sudden flip when the new angle differs too much from the previous for the
 447     // current velocity; in that case discard this move
 448     double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
 449     if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
 450         return FALSE;
 451     }
 452
 453     // convert to point
 454     dc->ang = NR::Point (cos (new_ang), sin (new_ang));
 455
 456 //    g_print ("force %g  acc %g  vel_max %g  vel %g  a1 %g  a2 %g  new_ang %g\n", NR::L2(force), NR::L2(dc->acc), dc->vel_max, NR::L2(dc->vel), a1, a2, new_ang);
 457
 458     /* Apply drag */
 459     dc->vel *= 1.0 - drag;
 460
 461     /* Update position */
 462     dc->last = dc->cur;
 463     dc->cur += dc->vel;
 464
 465     return TRUE;
 466 }
 467
 468 static void
 469 sp_eraser_brush(SPEraserContext *dc)
 470 {
 471     g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
 472
 473     // How much velocity thins strokestyle
 474     double vel_thin = flerp (0, 160, dc->vel_thin);
 475
 476     // Influence of pressure on thickness
 477     double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
 478
 479     // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
 480     // drag)
 481     NR::Point brush = sp_eraser_get_vpoint(dc, dc->cur);
 482     NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
 483
 484     double trace_thick = 1;
 485
 486     double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
 487
 488     double tremble_left = 0, tremble_right = 0;
 489     if (dc->tremor > 0) {
 490         // obtain two normally distributed random variables, using polar Box-Muller transform
 491         double x1, x2, w, y1, y2;
 492         do {
 493             x1 = 2.0 * g_random_double_range(0,1) - 1.0;
 494             x2 = 2.0 * g_random_double_range(0,1) - 1.0;
 495             w = x1 * x1 + x2 * x2;
 496         } while ( w >= 1.0 );
 497         w = sqrt( (-2.0 * log( w ) ) / w );
 498         y1 = x1 * w;
 499         y2 = x2 * w;
 500
 501         // deflect both left and right edges randomly and independently, so that:
 502         // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
 503         // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
 504         // (3) deflection somewhat depends on speed, to prevent fast strokes looking
 505         // comparatively smooth and slow ones excessively jittery
 506         tremble_left  = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 507         tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 508     }
 509
 510     if ( width < 0.02 * dc->width ) {
 511         width = 0.02 * dc->width;
 512     }
 513
 514     double dezoomify_factor = 0.05 * 1000;
 515     if (!dc->abs_width) {
 516         dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 517     }
 518
 519     NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
 520     NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
 521
 522     dc->point1[dc->npoints] = brush + del_left;
 523     dc->point2[dc->npoints] = brush - del_right;
 524
 525     dc->del = 0.5*(del_left + del_right);
 526
 527     dc->npoints++;
 528 }
 529
 530 void
 531 sp_erc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
 532 {
 533     desktop->setToolboxAdjustmentValue (id, value);
 534 }
 535
 536 static void
 537 eraser_cancel(SPEraserContext *dc)
 538 {
 539     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 540     dc->dragging = FALSE;
 541     dc->is_drawing = false;
 542     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
 543             /* Remove all temporary line segments */
 544             while (dc->segments) {
 545                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 546                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 547             }
 548             /* reset accumulated curve */
 549             sp_curve_reset(dc->accumulated);
 550             clear_current(dc);
 551             if (dc->repr) {
 552                 dc->repr = NULL;
 553             }
 554 }
 555
 556
 557 gint
 558 sp_eraser_context_root_handler(SPEventContext *event_context,
 559                                   GdkEvent *event)
 560 {
 561     SPEraserContext *dc = SP_ERASER_CONTEXT(event_context);
 562     SPDesktop *desktop = event_context->desktop;
 563
 564     gint ret = FALSE;
 565
 566     switch (event->type) {
 567         case GDK_BUTTON_PRESS:
 568             if (event->button.button == 1 && !event_context->space_panning) {
 569
 570                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 571
 572                 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 573                     return TRUE;
 574                 }
 575
 576                 NR::Point const button_w(event->button.x,
 577                                          event->button.y);
 578                 NR::Point const button_dt(desktop->w2d(button_w));
 579                 sp_eraser_reset(dc, button_dt);
 580                 sp_eraser_extinput(dc, event);
 581                 sp_eraser_apply(dc, button_dt);
 582                 sp_curve_reset(dc->accumulated);
 583                 if (dc->repr) {
 584                     dc->repr = NULL;
 585                 }
 586
 587                 Inkscape::Rubberband::get()->start(desktop, button_dt);
 588                 Inkscape::Rubberband::get()->setMode(RUBBERBAND_MODE_TOUCHPATH);
 589
 590                 /* initialize first point */
 591                 dc->npoints = 0;
 592
 593                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 594                                     ( GDK_KEY_PRESS_MASK |
 595                                       GDK_BUTTON_RELEASE_MASK |
 596                                       GDK_POINTER_MOTION_MASK |
 597                                       GDK_BUTTON_PRESS_MASK ),
 598                                     NULL,
 599                                     event->button.time);
 600
 601                 ret = TRUE;
 602
 603                 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
 604                 dc->is_drawing = true;
 605             }
 606             break;
 607         case GDK_MOTION_NOTIFY:
 608         {
 609             NR::Point const motion_w(event->motion.x,
 610                                      event->motion.y);
 611             NR::Point motion_dt(desktop->w2d(motion_w));
 612             sp_eraser_extinput(dc, event);
 613
 614             dc->_message_context->clear();
 615
 616             if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
 617                 dc->dragging = TRUE;
 618
 619                 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> an eraser stroke"));
 620
 621                 if (!sp_eraser_apply(dc, motion_dt)) {
 622                     ret = TRUE;
 623                     break;
 624                 }
 625
 626                 if ( dc->cur != dc->last ) {
 627                     sp_eraser_brush(dc);
 628                     g_assert( dc->npoints > 0 );
 629                     fit_and_split(dc, FALSE);
 630                 }
 631                 ret = TRUE;
 632             }
 633             Inkscape::Rubberband::get()->move(motion_dt);
 634         }
 635         break;
 636
 637
 638     case GDK_BUTTON_RELEASE:
 639     {
 640         NR::Point const motion_w(event->button.x, event->button.y);
 641         NR::Point const motion_dt(desktop->w2d(motion_w));
 642
 643         sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 644         sp_canvas_end_forced_full_redraws(desktop->canvas);
 645         dc->is_drawing = false;
 646
 647         if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
 648             dc->dragging = FALSE;
 649
 650             NR::Maybe<NR::Rect> const b = Inkscape::Rubberband::get()->getRectangle();
 651
 652             sp_eraser_apply(dc, motion_dt);
 653
 654             /* Remove all temporary line segments */
 655             while (dc->segments) {
 656                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 657                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 658             }
 659
 660             /* Create object */
 661             fit_and_split(dc, TRUE);
 662             accumulate_eraser(dc);
 663             set_to_accumulated(dc); // performs document_done
 664
 665             /* reset accumulated curve */
 666             sp_curve_reset(dc->accumulated);
 667
 668             clear_current(dc);
 669             if (dc->repr) {
 670                 dc->repr = NULL;
 671             }
 672
 673             Inkscape::Rubberband::get()->stop();
 674             dc->_message_context->clear();
 675             ret = TRUE;
 676         }
 677         break;
 678     }
 679
 680     case GDK_KEY_PRESS:
 681         switch (get_group0_keyval (&event->key)) {
 682         case GDK_Up:
 683         case GDK_KP_Up:
 684             if (!MOD__CTRL_ONLY) {
 685                 dc->angle += 5.0;
 686                 if (dc->angle > 90.0)
 687                     dc->angle = 90.0;
 688                 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
 689                 ret = TRUE;
 690             }
 691             break;
 692         case GDK_Down:
 693         case GDK_KP_Down:
 694             if (!MOD__CTRL_ONLY) {
 695                 dc->angle -= 5.0;
 696                 if (dc->angle < -90.0)
 697                     dc->angle = -90.0;
 698                 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
 699                 ret = TRUE;
 700             }
 701             break;
 702         case GDK_Right:
 703         case GDK_KP_Right:
 704             if (!MOD__CTRL_ONLY) {
 705                 dc->width += 0.01;
 706                 if (dc->width > 1.0)
 707                     dc->width = 1.0;
 708                 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100); // the same spinbutton is for alt+x
 709                 ret = TRUE;
 710             }
 711             break;
 712         case GDK_Left:
 713         case GDK_KP_Left:
 714             if (!MOD__CTRL_ONLY) {
 715                 dc->width -= 0.01;
 716                 if (dc->width < 0.01)
 717                     dc->width = 0.01;
 718                 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 719                 ret = TRUE;
 720             }
 721             break;
 722         case GDK_Home:
 723         case GDK_KP_Home:
 724             dc->width = 0.01;
 725             sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 726             ret = TRUE;
 727             break;
 728         case GDK_End:
 729         case GDK_KP_End:
 730             dc->width = 1.0;
 731             sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 732             ret = TRUE;
 733             break;
 734         case GDK_x:
 735         case GDK_X:
 736             if (MOD__ALT_ONLY) {
 737                 desktop->setToolboxFocusTo ("altx-eraser");
 738                 ret = TRUE;
 739             }
 740             break;
 741         case GDK_Escape:
 742             Inkscape::Rubberband::get()->stop();
 743             if (dc->is_drawing) {
 744                 // if drawing, cancel, otherwise pass it up for deselecting
 745                 eraser_cancel (dc);
 746                 ret = TRUE;
 747             }
 748             break;
 749         case GDK_z:
 750         case GDK_Z:
 751             if (MOD__CTRL_ONLY && dc->is_drawing) {
 752                 // if drawing, cancel, otherwise pass it up for undo
 753                 eraser_cancel (dc);
 754                 ret = TRUE;
 755             }
 756             break;
 757         default:
 758             break;
 759         }
 760         break;
 761
 762     case GDK_KEY_RELEASE:
 763         switch (get_group0_keyval(&event->key)) {
 764             case GDK_Control_L:
 765             case GDK_Control_R:
 766                 dc->_message_context->clear();
 767                 break;
 768             default:
 769                 break;
 770         }
 771
 772     default:
 773         break;
 774     }
 775
 776     if (!ret) {
 777         if (((SPEventContextClass *) parent_class)->root_handler) {
 778             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 779         }
 780     }
 781
 782     return ret;
 783 }
 784
 785
 786 static void
 787 clear_current(SPEraserContext *dc)
 788 {
 789     // reset bpath
 790     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
 791
 792     // reset curve
 793     sp_curve_reset(dc->currentcurve);
 794     sp_curve_reset(dc->cal1);
 795     sp_curve_reset(dc->cal2);
 796
 797     // reset points
 798     dc->npoints = 0;
 799 }
 800
 801 static void
 802 set_to_accumulated(SPEraserContext *dc)
 803 {
 804     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 805     bool workDone = false;
 806
 807     if (!sp_curve_empty(dc->accumulated)) {
 808         NArtBpath *abp;
 809         gchar *str;
 810
 811         if (!dc->repr) {
 812             /* Create object */
 813             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 814             Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 815
 816             /* Set style */
 817             sp_desktop_apply_style_tool (desktop, repr, "tools.eraser", false);
 818
 819             dc->repr = repr;
 820
 821             SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
 822             Inkscape::GC::release(dc->repr);
 823             item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 824             item->updateRepr();
 825         }
 826         abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
 827         str = sp_svg_write_path(abp);
 828         g_assert( str != NULL );
 829         g_free(abp);
 830         dc->repr->setAttribute("d", str);
 831         g_free(str);
 832
 833         if ( dc->repr ) {
 834             bool wasSelection = false;
 835             Inkscape::Selection *selection = sp_desktop_selection(desktop);
 836             gint eraserMode = (prefs_get_int_attribute("tools.eraser", "mode", 0) != 0) ? 1 : 0;
 837             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 838
 839             SPItem* acid = SP_ITEM(desktop->doc()->getObjectByRepr(dc->repr));
 840             NR::Maybe<NR::Rect> eraserBbox = acid->getBounds(NR::identity());
 841             NR::Rect bounds = (*eraserBbox) * desktop->doc2dt();
 842             std::vector<SPItem*> remainingItems;
 843             GSList* toWorkOn = 0;
 844             if (selection->isEmpty()) {
 845                 if ( eraserMode ) {
 846                     toWorkOn = sp_document_partial_items_in_box(sp_desktop_document(desktop), desktop->dkey, bounds);
 847                 } else {
 848                     Inkscape::Rubberband::Rubberband *r = Inkscape::Rubberband::get();
 849                     toWorkOn = sp_document_items_at_points(sp_desktop_document(desktop), desktop->dkey, r->getPoints());
 850                 }
 851                 toWorkOn = g_slist_remove( toWorkOn, acid );
 852             } else {
 853                 toWorkOn = g_slist_copy(const_cast<GSList*>(selection->itemList()));
 854                 wasSelection = true;
 855             }
 856
 857             if ( g_slist_length(toWorkOn) > 0 ) {
 858                 if ( eraserMode ) {
 859                     for (GSList *i = toWorkOn ; i ; i = i->next ) {
 860                         SPItem *item = SP_ITEM(i->data);
 861                         if ( eraserMode ) {
 862                             NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity());
 863                             if (bbox && bbox->intersects(*eraserBbox)) {
 864                                 Inkscape::XML::Node* dup = dc->repr->duplicate(xml_doc);
 865                                 dc->repr->parent()->appendChild(dup);
 866                                 Inkscape::GC::release(dup); // parent takes over
 867
 868                                 selection->set(item);
 869                                 selection->add(dup);
 870                                 sp_selected_path_diff_skip_undo();
 871                                 workDone = true; // TODO set this only if something was cut.
 872                                 if ( !selection->isEmpty() ) {
 873                                     // If the item was not completely erased, track the new remainder.
 874                                     GSList *nowSel = g_slist_copy(const_cast<GSList *>(selection->itemList()));
 875                                     for (GSList const *i2 = nowSel ; i2 ; i2 = i2->next ) {
 876                                         remainingItems.push_back(SP_ITEM(i2->data));
 877                                     }
 878                                     g_slist_free(nowSel);
 879                                 }
 880                             } else {
 881                                 remainingItems.push_back(item);
 882                             }
 883                         }
 884                     }
 885                 } else {
 886                     for (GSList *i = toWorkOn ; i ; i = i->next ) {
 887                         sp_object_ref( SP_ITEM(i->data), 0 );
 888                     }
 889                     for (GSList *i = toWorkOn ; i ; i = i->next ) {
 890                         SPItem *item = SP_ITEM(i->data);
 891                         item->deleteObject(true);
 892                         sp_object_unref(item);
 893                         workDone = true;
 894                     }
 895                 }
 896
 897                 g_slist_free(toWorkOn);
 898
 899                 if ( !eraserMode ) {
 900                     //sp_selection_delete();
 901                     remainingItems.clear();
 902                 }
 903
 904                 selection->clear();
 905                 if ( wasSelection ) {
 906                     if ( !remainingItems.empty() ) {
 907                         selection->add(remainingItems.begin(), remainingItems.end());
 908                     }
 909                 }
 910             }
 911
 912             // Remove the eraser stroke itself:
 913             sp_repr_unparent( dc->repr );
 914             dc->repr = 0;
 915         }
 916     } else {
 917         if (dc->repr) {
 918             sp_repr_unparent(dc->repr);
 919             dc->repr = 0;
 920         }
 921     }
 922
 923
 924     if ( workDone ) {
 925         sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ERASER,
 926                          _("Draw eraser stroke"));
 927     } else {
 928         sp_document_cancel(sp_desktop_document(desktop));
 929     }
 930 }
 931
 932 static void
 933 add_cap(SPCurve *curve,
 934         NR::Point const &pre, NR::Point const &from,
 935         NR::Point const &to, NR::Point const &post,
 936         double rounding)
 937 {
 938     NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
 939     double mag = NR::L2(vel);
 940
 941     NR::Point v_in = from - pre;
 942     double mag_in = NR::L2(v_in);
 943     if ( mag_in > ERASER_EPSILON ) {
 944         v_in = mag * v_in / mag_in;
 945     } else {
 946         v_in = NR::Point(0, 0);
 947     }
 948
 949     NR::Point v_out = to - post;
 950     double mag_out = NR::L2(v_out);
 951     if ( mag_out > ERASER_EPSILON ) {
 952         v_out = mag * v_out / mag_out;
 953     } else {
 954         v_out = NR::Point(0, 0);
 955     }
 956
 957     if ( NR::L2(v_in) > ERASER_EPSILON || NR::L2(v_out) > ERASER_EPSILON ) {
 958         sp_curve_curveto(curve, from + v_in, to + v_out, to);
 959     }
 960 }
 961
 962 static void
 963 accumulate_eraser(SPEraserContext *dc)
 964 {
 965     if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
 966         sp_curve_reset(dc->accumulated); //  Is this required ??
 967         SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
 968
 969         g_assert(dc->cal1->end > 1);
 970         g_assert(rev_cal2->end > 1);
 971         g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
 972         g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
 973         g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
 974         g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
 975         g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
 976         g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
 977
 978         sp_curve_append(dc->accumulated, dc->cal1, FALSE);
 979
 980         add_cap(dc->accumulated, SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(2), SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(3), SP_CURVE_SEGMENT(rev_cal2, 0)->c(3), SP_CURVE_SEGMENT(rev_cal2, 1)->c(1), dc->cap_rounding);
 981
 982         sp_curve_append(dc->accumulated, rev_cal2, TRUE);
 983
 984         add_cap(dc->accumulated, SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(2), SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(3), SP_CURVE_SEGMENT(dc->cal1, 0)->c(3), SP_CURVE_SEGMENT(dc->cal1, 1)->c(1), dc->cap_rounding);
 985
 986         sp_curve_closepath(dc->accumulated);
 987
 988         sp_curve_unref(rev_cal2);
 989
 990         sp_curve_reset(dc->cal1);
 991         sp_curve_reset(dc->cal2);
 992     }
 993 }
 994
 995 static double square(double const x)
 996 {
 997     return x * x;
 998 }
 999
1000 static void
1001 fit_and_split(SPEraserContext *dc, gboolean release)
1002 {
1003     double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_ERASER );
1004
1005 #ifdef ERASER_VERBOSE
1006     g_print("[F&S:R=%c]", release?'T':'F');
1007 #endif
1008
1009     if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1010         return; // just clicked
1011
1012     if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1013 #define BEZIER_SIZE       4
1014 #define BEZIER_MAX_BEZIERS  8
1015 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1016
1017 #ifdef ERASER_VERBOSE
1018         g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1019                 dc->npoints, release ? "TRUE" : "FALSE");
1020 #endif
1021
1022         /* Current eraser */
1023         if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
1024             /* dc->npoints > 0 */
1025             /* g_print("erasers(1|2) reset\n"); */
1026             sp_curve_reset(dc->cal1);
1027             sp_curve_reset(dc->cal2);
1028
1029             sp_curve_moveto(dc->cal1, dc->point1[0]);
1030             sp_curve_moveto(dc->cal2, dc->point2[0]);
1031         }
1032
1033         NR::Point b1[BEZIER_MAX_LENGTH];
1034         gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1035                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1036         g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1037
1038         NR::Point b2[BEZIER_MAX_LENGTH];
1039         gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1040                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1041         g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1042
1043         if ( nb1 != -1 && nb2 != -1 ) {
1044             /* Fit and draw and reset state */
1045 #ifdef ERASER_VERBOSE
1046             g_print("nb1:%d nb2:%d\n", nb1, nb2);
1047 #endif
1048             /* CanvasShape */
1049             if (! release) {
1050                 sp_curve_reset(dc->currentcurve);
1051                 sp_curve_moveto(dc->currentcurve, b1[0]);
1052                 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1053                     sp_curve_curveto(dc->currentcurve, bp1[1],
1054                                      bp1[2], bp1[3]);
1055                 }
1056                 sp_curve_lineto(dc->currentcurve,
1057                                 b2[BEZIER_SIZE*(nb2-1) + 3]);
1058                 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1059                     sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1060                 }
1061                 // FIXME: dc->segments is always NULL at this point??
1062                 if (!dc->segments) { // first segment
1063                     add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1064                 }
1065                 sp_curve_closepath(dc->currentcurve);
1066                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1067             }
1068
1069             /* Current eraser */
1070             for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1071                 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1072             }
1073             for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1074                 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1075             }
1076         } else {
1077             /* fixme: ??? */
1078 #ifdef ERASER_VERBOSE
1079             g_print("[fit_and_split] failed to fit-cubic.\n");
1080 #endif
1081             draw_temporary_box(dc);
1082
1083             for (gint i = 1; i < dc->npoints; i++) {
1084                 sp_curve_lineto(dc->cal1, dc->point1[i]);
1085             }
1086             for (gint i = 1; i < dc->npoints; i++) {
1087                 sp_curve_lineto(dc->cal2, dc->point2[i]);
1088             }
1089         }
1090
1091         /* Fit and draw and copy last point */
1092 #ifdef ERASER_VERBOSE
1093         g_print("[%d]Yup\n", dc->npoints);
1094 #endif
1095         if (!release) {
1096             gint eraserMode = (prefs_get_int_attribute("tools.eraser", "mode", 0) != 0) ? 1 : 0;
1097             g_assert(!sp_curve_empty(dc->currentcurve));
1098
1099             SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1100                                                    SP_TYPE_CANVAS_BPATH,
1101                                                    NULL);
1102             SPCurve *curve = sp_curve_copy(dc->currentcurve);
1103             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1104             sp_curve_unref(curve);
1105
1106             guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1107             //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1108             double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser");
1109             double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1110             //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1111             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1112             //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1113             //sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), ((strokeColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*strokeOpacity)), 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1114             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1115             /* fixme: Cannot we cascade it to root more clearly? */
1116             g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1117
1118             dc->segments = g_slist_prepend(dc->segments, cbp);
1119
1120             if ( !eraserMode ) {
1121                 sp_canvas_item_hide(cbp);
1122                 sp_canvas_item_hide(dc->currentshape);
1123             }
1124         }
1125
1126         dc->point1[0] = dc->point1[dc->npoints - 1];
1127         dc->point2[0] = dc->point2[dc->npoints - 1];
1128         dc->npoints = 1;
1129     } else {
1130         draw_temporary_box(dc);
1131     }
1132 }
1133
1134 static void
1135 draw_temporary_box(SPEraserContext *dc)
1136 {
1137     sp_curve_reset(dc->currentcurve);
1138
1139     sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1140     for (gint i = dc->npoints-2; i >= 0; i--) {
1141         sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1142     }
1143     for (gint i = 0; i < dc->npoints; i++) {
1144         sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1145     }
1146     if (dc->npoints >= 2) {
1147         add_cap(dc->currentcurve, dc->point2[dc->npoints-2], dc->point2[dc->npoints-1], dc->point1[dc->npoints-1], dc->point1[dc->npoints-2], dc->cap_rounding);
1148     }
1149
1150     sp_curve_closepath(dc->currentcurve);
1151     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1152 }
1153
1154 /*
1155   Local Variables:
1156   mode:c++
1157   c-file-style:"stroustrup"
1158   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1159   indent-tabs-mode:nil
1160   fill-column:99
1161   End:
1162 */
1163 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :