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 "splivarot.h"
  61 #include "sp-item-group.h"
  62 #include "sp-shape.h"
  63 #include "sp-path.h"
  64 #include "sp-text.h"
  65 #include "display/canvas-bpath.h"
  66 #include "display/canvas-arena.h"
  67 #include "livarot/Shape.h"
  68 #include "isnan.h"
  69
  70 #include "eraser-context.h"
  71
  72 #define ERC_RED_RGBA 0xff0000ff
  73
  74 #define TOLERANCE_ERASER 0.1
  75
  76 #define ERASER_EPSILON 0.5e-6
  77 #define ERASER_EPSILON_START 0.5e-2
  78 #define ERASER_VEL_START 1e-5
  79
  80 #define DRAG_MIN 0.0
  81 #define DRAG_DEFAULT 1.0
  82 #define DRAG_MAX 1.0
  83
  84
  85 static void sp_eraser_context_class_init(SPEraserContextClass *klass);
  86 static void sp_eraser_context_init(SPEraserContext *erc);
  87 static void sp_eraser_context_dispose(GObject *object);
  88
  89 static void sp_eraser_context_setup(SPEventContext *ec);
  90 static void sp_eraser_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  91 static gint sp_eraser_context_root_handler(SPEventContext *ec, GdkEvent *event);
  92
  93 static void clear_current(SPEraserContext *dc);
  94 static void set_to_accumulated(SPEraserContext *dc);
  95 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
  96 static void accumulate_eraser(SPEraserContext *dc);
  97
  98 static void fit_and_split(SPEraserContext *erc, gboolean release);
  99
 100 static void sp_eraser_reset(SPEraserContext *erc, NR::Point p);
 101 static NR::Point sp_eraser_get_npoint(SPEraserContext const *erc, NR::Point v);
 102 static NR::Point sp_eraser_get_vpoint(SPEraserContext const *erc, NR::Point n);
 103 static void draw_temporary_box(SPEraserContext *dc);
 104
 105
 106 static SPEventContextClass *parent_class;
 107
 108 GtkType
 109 sp_eraser_context_get_type(void)
 110 {
 111     static GType type = 0;
 112     if (!type) {
 113         GTypeInfo info = {
 114             sizeof(SPEraserContextClass),
 115             NULL, NULL,
 116             (GClassInitFunc) sp_eraser_context_class_init,
 117             NULL, NULL,
 118             sizeof(SPEraserContext),
 119             4,
 120             (GInstanceInitFunc) sp_eraser_context_init,
 121             NULL,   /* value_table */
 122         };
 123         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPEraserContext", &info, (GTypeFlags)0);
 124     }
 125     return type;
 126 }
 127
 128 static void
 129 sp_eraser_context_class_init(SPEraserContextClass *klass)
 130 {
 131     GObjectClass *object_class = (GObjectClass *) klass;
 132     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 133
 134     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 135
 136     object_class->dispose = sp_eraser_context_dispose;
 137
 138     event_context_class->setup = sp_eraser_context_setup;
 139     event_context_class->set = sp_eraser_context_set;
 140     event_context_class->root_handler = sp_eraser_context_root_handler;
 141 }
 142
 143 static void
 144 sp_eraser_context_init(SPEraserContext *erc)
 145 {
 146     SPEventContext *event_context = SP_EVENT_CONTEXT(erc);
 147
 148     event_context->cursor_shape = cursor_eraser_xpm;
 149     event_context->hot_x = 4;
 150     event_context->hot_y = 4;
 151
 152     erc->accumulated = NULL;
 153     erc->segments = NULL;
 154     erc->currentcurve = NULL;
 155     erc->currentshape = NULL;
 156     erc->npoints = 0;
 157     erc->cal1 = NULL;
 158     erc->cal2 = NULL;
 159     erc->repr = NULL;
 160
 161     /* Eraser values */
 162     erc->cur = NR::Point(0,0);
 163     erc->last = NR::Point(0,0);
 164     erc->vel = NR::Point(0,0);
 165     erc->vel_max = 0;
 166     erc->acc = NR::Point(0,0);
 167     erc->ang = NR::Point(0,0);
 168     erc->del = NR::Point(0,0);
 169
 170     /* attributes */
 171     erc->dragging = FALSE;
 172
 173     erc->mass = 0.3;
 174     erc->drag = DRAG_DEFAULT;
 175     erc->angle = 30.0;
 176     erc->width = 0.2;
 177     erc->pressure = ERC_DEFAULT_PRESSURE;
 178
 179     erc->vel_thin = 0.1;
 180     erc->flatness = 0.9;
 181     erc->cap_rounding = 0.0;
 182
 183     erc->abs_width = false;
 184 }
 185
 186 static void
 187 sp_eraser_context_dispose(GObject *object)
 188 {
 189     SPEraserContext *erc = SP_ERASER_CONTEXT(object);
 190
 191     if (erc->accumulated) {
 192         erc->accumulated = sp_curve_unref(erc->accumulated);
 193     }
 194
 195     while (erc->segments) {
 196         gtk_object_destroy(GTK_OBJECT(erc->segments->data));
 197         erc->segments = g_slist_remove(erc->segments, erc->segments->data);
 198     }
 199
 200     if (erc->currentcurve) erc->currentcurve = sp_curve_unref(erc->currentcurve);
 201     if (erc->cal1) erc->cal1 = sp_curve_unref(erc->cal1);
 202     if (erc->cal2) erc->cal2 = sp_curve_unref(erc->cal2);
 203
 204     if (erc->currentshape) {
 205         gtk_object_destroy(GTK_OBJECT(erc->currentshape));
 206         erc->currentshape = NULL;
 207     }
 208
 209     if (erc->_message_context) {
 210         delete erc->_message_context;
 211     }
 212
 213     G_OBJECT_CLASS(parent_class)->dispose(object);
 214 }
 215
 216 static void
 217 sp_eraser_context_setup(SPEventContext *ec)
 218 {
 219     SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
 220
 221     if (((SPEventContextClass *) parent_class)->setup)
 222         ((SPEventContextClass *) parent_class)->setup(ec);
 223
 224     erc->accumulated = sp_curve_new_sized(32);
 225     erc->currentcurve = sp_curve_new_sized(4);
 226
 227     erc->cal1 = sp_curve_new_sized(32);
 228     erc->cal2 = sp_curve_new_sized(32);
 229
 230     erc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
 231     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(erc->currentshape), ERC_RED_RGBA, SP_WIND_RULE_EVENODD);
 232     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(erc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 233     /* fixme: Cannot we cascade it to root more clearly? */
 234     g_signal_connect(G_OBJECT(erc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
 235
 236 /*
 237 static ProfileFloatElement f_profile[PROFILE_FLOAT_SIZE] = {
 238     {"mass",0.02, 0.0, 1.0},
 239     {"wiggle",0.0, 0.0, 1.0},
 240     {"angle",30.0, -90.0, 90.0},
 241     {"thinning",0.1, -1.0, 1.0},
 242     {"tremor",0.0, 0.0, 1.0},
 243     {"flatness",0.9, 0.0, 1.0},
 244     {"cap_rounding",0.0, 0.0, 5.0}
 245 };
 246 */
 247
 248     sp_event_context_read(ec, "mass");
 249     sp_event_context_read(ec, "wiggle");
 250     sp_event_context_read(ec, "angle");
 251     sp_event_context_read(ec, "width");
 252     sp_event_context_read(ec, "thinning");
 253     sp_event_context_read(ec, "tremor");
 254     sp_event_context_read(ec, "flatness");
 255     sp_event_context_read(ec, "tracebackground");
 256     sp_event_context_read(ec, "usepressure");
 257     sp_event_context_read(ec, "usetilt");
 258     sp_event_context_read(ec, "abs_width");
 259     sp_event_context_read(ec, "cap_rounding");
 260
 261     erc->is_drawing = false;
 262
 263     erc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 264
 265     if (prefs_get_int_attribute("tools.eraser", "selcue", 0) != 0) {
 266         ec->enableSelectionCue();
 267     }
 268 // TODO temp force:
 269     ec->enableSelectionCue();
 270
 271 }
 272
 273 static void
 274 sp_eraser_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 275 {
 276     SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
 277
 278     if (!strcmp(key, "mass")) {
 279         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
 280         erc->mass = CLAMP(dval, -1000.0, 1000.0);
 281     } else if (!strcmp(key, "wiggle")) {
 282         double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
 283         erc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
 284     } else if (!strcmp(key, "angle")) {
 285         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
 286         erc->angle = CLAMP (dval, -90, 90);
 287     } else if (!strcmp(key, "width")) {
 288         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 289         erc->width = CLAMP(dval, -1000.0, 1000.0);
 290     } else if (!strcmp(key, "thinning")) {
 291         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 292         erc->vel_thin = CLAMP(dval, -1.0, 1.0);
 293     } else if (!strcmp(key, "tremor")) {
 294         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 295         erc->tremor = CLAMP(dval, 0.0, 1.0);
 296     } else if (!strcmp(key, "flatness")) {
 297         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 298         erc->flatness = CLAMP(dval, 0, 1.0);
 299     } else if (!strcmp(key, "usepressure")) {
 300         erc->usepressure = (val && strcmp(val, "0"));
 301     } else if (!strcmp(key, "usetilt")) {
 302         erc->usetilt = (val && strcmp(val, "0"));
 303     } else if (!strcmp(key, "abs_width")) {
 304         erc->abs_width = (val && strcmp(val, "0"));
 305     } else if (!strcmp(key, "cap_rounding")) {
 306         erc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 307     }
 308
 309     //g_print("ERC: %g %g %g %g\n", erc->mass, erc->drag, erc->angle, erc->width);
 310 }
 311
 312 static double
 313 flerp(double f0, double f1, double p)
 314 {
 315     return f0 + ( f1 - f0 ) * p;
 316 }
 317
 318 /* Get normalized point */
 319 static NR::Point
 320 sp_eraser_get_npoint(SPEraserContext const *dc, NR::Point v)
 321 {
 322     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 323     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 324     return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max,  ( v[NR::Y] - drect.min()[NR::Y] ) / max);
 325 }
 326
 327 /* Get view point */
 328 static NR::Point
 329 sp_eraser_get_vpoint(SPEraserContext const *dc, NR::Point n)
 330 {
 331     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 332     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 333     return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
 334 }
 335
 336 static void
 337 sp_eraser_reset(SPEraserContext *dc, NR::Point p)
 338 {
 339     dc->last = dc->cur = sp_eraser_get_npoint(dc, p);
 340     dc->vel = NR::Point(0,0);
 341     dc->vel_max = 0;
 342     dc->acc = NR::Point(0,0);
 343     dc->ang = NR::Point(0,0);
 344     dc->del = NR::Point(0,0);
 345 }
 346
 347 static void
 348 sp_eraser_extinput(SPEraserContext *dc, GdkEvent *event)
 349 {
 350     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
 351         dc->pressure = CLAMP (dc->pressure, ERC_MIN_PRESSURE, ERC_MAX_PRESSURE);
 352     else
 353         dc->pressure = ERC_DEFAULT_PRESSURE;
 354
 355     if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
 356         dc->xtilt = CLAMP (dc->xtilt, ERC_MIN_TILT, ERC_MAX_TILT);
 357     else
 358         dc->xtilt = ERC_DEFAULT_TILT;
 359
 360     if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
 361         dc->ytilt = CLAMP (dc->ytilt, ERC_MIN_TILT, ERC_MAX_TILT);
 362     else
 363         dc->ytilt = ERC_DEFAULT_TILT;
 364 }
 365
 366
 367 static gboolean
 368 sp_eraser_apply(SPEraserContext *dc, NR::Point p)
 369 {
 370     NR::Point n = sp_eraser_get_npoint(dc, p);
 371
 372     /* Calculate mass and drag */
 373     double const mass = flerp(1.0, 160.0, dc->mass);
 374     double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
 375
 376     /* Calculate force and acceleration */
 377     NR::Point force = n - dc->cur;
 378
 379     // If force is below the absolute threshold ERASER_EPSILON,
 380     // or we haven't yet reached ERASER_VEL_START (i.e. at the beginning of stroke)
 381     // _and_ the force is below the (higher) ERASER_EPSILON_START threshold,
 382     // discard this move.
 383     // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
 384     // especially bothersome at the start of the stroke where we don't yet have the inertia to
 385     // smooth them out.
 386     if ( NR::L2(force) < ERASER_EPSILON || (dc->vel_max < ERASER_VEL_START && NR::L2(force) < ERASER_EPSILON_START)) {
 387         return FALSE;
 388     }
 389
 390     dc->acc = force / mass;
 391
 392     /* Calculate new velocity */
 393     dc->vel += dc->acc;
 394
 395     if (NR::L2(dc->vel) > dc->vel_max)
 396         dc->vel_max = NR::L2(dc->vel);
 397
 398     /* Calculate angle of drawing tool */
 399
 400     double a1;
 401     if (dc->usetilt) {
 402         // 1a. calculate nib angle from input device tilt:
 403         gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
 404
 405         if (length > 0) {
 406             NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
 407             a1 = atan2(ang1);
 408         }
 409         else
 410             a1 = 0.0;
 411     }
 412     else {
 413         // 1b. fixed dc->angle (absolutely flat nib):
 414         double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
 415         NR::Point ang1 = NR::Point(-sin(radians),  cos(radians));
 416         a1 = atan2(ang1);
 417     }
 418
 419     // 2. perpendicular to dc->vel (absolutely non-flat nib):
 420     gdouble const mag_vel = NR::L2(dc->vel);
 421     if ( mag_vel < ERASER_EPSILON ) {
 422         return FALSE;
 423     }
 424     NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
 425
 426     // 3. Average them using flatness parameter:
 427     // calculate angles
 428     double a2 = atan2(ang2);
 429     // flip a2 to force it to be in the same half-circle as a1
 430     bool flipped = false;
 431     if (fabs (a2-a1) > 0.5*M_PI) {
 432         a2 += M_PI;
 433         flipped = true;
 434     }
 435     // normalize a2
 436     if (a2 > M_PI)
 437         a2 -= 2*M_PI;
 438     if (a2 < -M_PI)
 439         a2 += 2*M_PI;
 440     // find the flatness-weighted bisector angle, unflip if a2 was flipped
 441     // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
 442     double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
 443
 444     // Try to detect a sudden flip when the new angle differs too much from the previous for the
 445     // current velocity; in that case discard this move
 446     double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
 447     if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
 448         return FALSE;
 449     }
 450
 451     // convert to point
 452     dc->ang = NR::Point (cos (new_ang), sin (new_ang));
 453
 454 //    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);
 455
 456     /* Apply drag */
 457     dc->vel *= 1.0 - drag;
 458
 459     /* Update position */
 460     dc->last = dc->cur;
 461     dc->cur += dc->vel;
 462
 463     return TRUE;
 464 }
 465
 466 static void
 467 sp_eraser_brush(SPEraserContext *dc)
 468 {
 469     g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
 470
 471     // How much velocity thins strokestyle
 472     double vel_thin = flerp (0, 160, dc->vel_thin);
 473
 474     // Influence of pressure on thickness
 475     double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
 476
 477     // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
 478     // drag)
 479     NR::Point brush = sp_eraser_get_vpoint(dc, dc->cur);
 480     NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
 481
 482     double trace_thick = 1;
 483
 484     double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
 485
 486     double tremble_left = 0, tremble_right = 0;
 487     if (dc->tremor > 0) {
 488         // obtain two normally distributed random variables, using polar Box-Muller transform
 489         double x1, x2, w, y1, y2;
 490         do {
 491             x1 = 2.0 * g_random_double_range(0,1) - 1.0;
 492             x2 = 2.0 * g_random_double_range(0,1) - 1.0;
 493             w = x1 * x1 + x2 * x2;
 494         } while ( w >= 1.0 );
 495         w = sqrt( (-2.0 * log( w ) ) / w );
 496         y1 = x1 * w;
 497         y2 = x2 * w;
 498
 499         // deflect both left and right edges randomly and independently, so that:
 500         // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
 501         // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
 502         // (3) deflection somewhat depends on speed, to prevent fast strokes looking
 503         // comparatively smooth and slow ones excessively jittery
 504         tremble_left  = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 505         tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 506     }
 507
 508     if ( width < 0.02 * dc->width ) {
 509         width = 0.02 * dc->width;
 510     }
 511
 512     double dezoomify_factor = 0.05 * 1000;
 513     if (!dc->abs_width) {
 514         dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 515     }
 516
 517     NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
 518     NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
 519
 520     dc->point1[dc->npoints] = brush + del_left;
 521     dc->point2[dc->npoints] = brush - del_right;
 522
 523     dc->del = 0.5*(del_left + del_right);
 524
 525     dc->npoints++;
 526 }
 527
 528 void
 529 sp_erc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
 530 {
 531     desktop->setToolboxAdjustmentValue (id, value);
 532 }
 533
 534 static void
 535 eraser_cancel(SPEraserContext *dc)
 536 {
 537     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 538     dc->dragging = FALSE;
 539     dc->is_drawing = false;
 540     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
 541             /* Remove all temporary line segments */
 542             while (dc->segments) {
 543                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 544                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 545             }
 546             /* reset accumulated curve */
 547             sp_curve_reset(dc->accumulated);
 548             clear_current(dc);
 549             if (dc->repr) {
 550                 dc->repr = NULL;
 551             }
 552 }
 553
 554
 555 gint
 556 sp_eraser_context_root_handler(SPEventContext *event_context,
 557                                   GdkEvent *event)
 558 {
 559     SPEraserContext *dc = SP_ERASER_CONTEXT(event_context);
 560     SPDesktop *desktop = event_context->desktop;
 561
 562     gint ret = FALSE;
 563
 564     switch (event->type) {
 565         case GDK_BUTTON_PRESS:
 566             if (event->button.button == 1 && !event_context->space_panning) {
 567
 568                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 569
 570                 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 571                     return TRUE;
 572                 }
 573
 574                 NR::Point const button_w(event->button.x,
 575                                          event->button.y);
 576                 NR::Point const button_dt(desktop->w2d(button_w));
 577                 sp_eraser_reset(dc, button_dt);
 578                 sp_eraser_extinput(dc, event);
 579                 sp_eraser_apply(dc, button_dt);
 580                 sp_curve_reset(dc->accumulated);
 581                 if (dc->repr) {
 582                     dc->repr = NULL;
 583                 }
 584
 585                 /* initialize first point */
 586                 dc->npoints = 0;
 587
 588                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 589                                     ( GDK_KEY_PRESS_MASK |
 590                                       GDK_BUTTON_RELEASE_MASK |
 591                                       GDK_POINTER_MOTION_MASK |
 592                                       GDK_BUTTON_PRESS_MASK ),
 593                                     NULL,
 594                                     event->button.time);
 595
 596                 ret = TRUE;
 597
 598                 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
 599                 dc->is_drawing = true;
 600             }
 601             break;
 602         case GDK_MOTION_NOTIFY:
 603         {
 604             NR::Point const motion_w(event->motion.x,
 605                                      event->motion.y);
 606             NR::Point motion_dt(desktop->w2d(motion_w));
 607             sp_eraser_extinput(dc, event);
 608
 609             dc->_message_context->clear();
 610
 611             if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
 612                 dc->dragging = TRUE;
 613
 614                 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a eraser stroke"));
 615
 616                 if (!sp_eraser_apply(dc, motion_dt)) {
 617                     ret = TRUE;
 618                     break;
 619                 }
 620
 621                 if ( dc->cur != dc->last ) {
 622                     sp_eraser_brush(dc);
 623                     g_assert( dc->npoints > 0 );
 624                     fit_and_split(dc, FALSE);
 625                 }
 626                 ret = TRUE;
 627             }
 628         }
 629         break;
 630
 631
 632     case GDK_BUTTON_RELEASE:
 633     {
 634         NR::Point const motion_w(event->button.x, event->button.y);
 635         NR::Point const motion_dt(desktop->w2d(motion_w));
 636
 637         sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 638         sp_canvas_end_forced_full_redraws(desktop->canvas);
 639         dc->is_drawing = false;
 640
 641         if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
 642             dc->dragging = FALSE;
 643
 644             sp_eraser_apply(dc, motion_dt);
 645
 646             /* Remove all temporary line segments */
 647             while (dc->segments) {
 648                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 649                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 650             }
 651
 652             /* Create object */
 653             fit_and_split(dc, TRUE);
 654             accumulate_eraser(dc);
 655             set_to_accumulated(dc); // performs document_done
 656
 657             /* reset accumulated curve */
 658             sp_curve_reset(dc->accumulated);
 659
 660             clear_current(dc);
 661             if (dc->repr) {
 662                 dc->repr = NULL;
 663             }
 664
 665             dc->_message_context->clear();
 666             ret = TRUE;
 667         }
 668         break;
 669     }
 670
 671     case GDK_KEY_PRESS:
 672         switch (get_group0_keyval (&event->key)) {
 673         case GDK_Up:
 674         case GDK_KP_Up:
 675             if (!MOD__CTRL_ONLY) {
 676                 dc->angle += 5.0;
 677                 if (dc->angle > 90.0)
 678                     dc->angle = 90.0;
 679                 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
 680                 ret = TRUE;
 681             }
 682             break;
 683         case GDK_Down:
 684         case GDK_KP_Down:
 685             if (!MOD__CTRL_ONLY) {
 686                 dc->angle -= 5.0;
 687                 if (dc->angle < -90.0)
 688                     dc->angle = -90.0;
 689                 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
 690                 ret = TRUE;
 691             }
 692             break;
 693         case GDK_Right:
 694         case GDK_KP_Right:
 695             if (!MOD__CTRL_ONLY) {
 696                 dc->width += 0.01;
 697                 if (dc->width > 1.0)
 698                     dc->width = 1.0;
 699                 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100); // the same spinbutton is for alt+x
 700                 ret = TRUE;
 701             }
 702             break;
 703         case GDK_Left:
 704         case GDK_KP_Left:
 705             if (!MOD__CTRL_ONLY) {
 706                 dc->width -= 0.01;
 707                 if (dc->width < 0.01)
 708                     dc->width = 0.01;
 709                 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 710                 ret = TRUE;
 711             }
 712             break;
 713         case GDK_Home:
 714         case GDK_KP_Home:
 715             dc->width = 0.01;
 716             sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 717             ret = TRUE;
 718             break;
 719         case GDK_End:
 720         case GDK_KP_End:
 721             dc->width = 1.0;
 722             sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
 723             ret = TRUE;
 724             break;
 725         case GDK_x:
 726         case GDK_X:
 727             if (MOD__ALT_ONLY) {
 728                 desktop->setToolboxFocusTo ("altx-eraser");
 729                 ret = TRUE;
 730             }
 731             break;
 732         case GDK_Escape:
 733             if (dc->is_drawing) {
 734                 // if drawing, cancel, otherwise pass it up for deselecting
 735                 eraser_cancel (dc);
 736                 ret = TRUE;
 737             }
 738             break;
 739         case GDK_z:
 740         case GDK_Z:
 741             if (MOD__CTRL_ONLY && dc->is_drawing) {
 742                 // if drawing, cancel, otherwise pass it up for undo
 743                 eraser_cancel (dc);
 744                 ret = TRUE;
 745             }
 746             break;
 747         default:
 748             break;
 749         }
 750         break;
 751
 752     case GDK_KEY_RELEASE:
 753         switch (get_group0_keyval(&event->key)) {
 754             case GDK_Control_L:
 755             case GDK_Control_R:
 756                 dc->_message_context->clear();
 757                 break;
 758             default:
 759                 break;
 760         }
 761
 762     default:
 763         break;
 764     }
 765
 766     if (!ret) {
 767         if (((SPEventContextClass *) parent_class)->root_handler) {
 768             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 769         }
 770     }
 771
 772     return ret;
 773 }
 774
 775
 776 static void
 777 clear_current(SPEraserContext *dc)
 778 {
 779     /* reset bpath */
 780     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
 781     /* reset curve */
 782     sp_curve_reset(dc->currentcurve);
 783     sp_curve_reset(dc->cal1);
 784     sp_curve_reset(dc->cal2);
 785     /* reset points */
 786     dc->npoints = 0;
 787 }
 788
 789 static void
 790 set_to_accumulated(SPEraserContext *dc)
 791 {
 792     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 793
 794     if (!sp_curve_empty(dc->accumulated)) {
 795         NArtBpath *abp;
 796         gchar *str;
 797
 798         if (!dc->repr) {
 799             /* Create object */
 800             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 801             Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
 802
 803             /* Set style */
 804             sp_desktop_apply_style_tool (desktop, repr, "tools.eraser", false);
 805
 806             dc->repr = repr;
 807
 808             SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
 809             Inkscape::GC::release(dc->repr);
 810             item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 811             item->updateRepr();
 812         }
 813         abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
 814         str = sp_svg_write_path(abp);
 815         g_assert( str != NULL );
 816         g_free(abp);
 817         dc->repr->setAttribute("d", str);
 818         g_free(str);
 819
 820         if ( dc->repr ) {
 821             Inkscape::Selection *selection = sp_desktop_selection(desktop);
 822             gint eraserMode = (prefs_get_int_attribute("tools.eraser", "mode", 0) != 0) ? 1 : 0;
 823             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
 824             if (!selection->isEmpty()) {
 825                 // Do selection-limited
 826                 if ( eraserMode == 0 ) {
 827                     // Nuke
 828                 } else {
 829                     // Cut-out
 830                     std::vector<SPItem*> putBacks;
 831                     GSList const *selected = g_slist_copy(const_cast<GSList *>(selection->itemList()));
 832                     for (GSList const *i = selected ; i ; i = i->next ) {
 833                         SPItem *item = SP_ITEM(i->data);
 834                         Inkscape::XML::Node* dup = dc->repr->duplicate(xml_doc);
 835                         dc->repr->parent()->appendChild(dup);
 836                         Inkscape::GC::release(dup);
 837
 838                         selection->set(item);
 839                         selection->add(dup);
 840                         sp_selected_path_diff();
 841                         if ( !selection->isEmpty() ) {
 842                             // If the item was not completely erased, add it back to the selection.
 843                             GSList const *selected2 = g_slist_copy(const_cast<GSList *>(selection->itemList()));
 844                             for (GSList const *i2 = selected2 ; i2 ; i2 = i2->next ) {
 845                                 putBacks.push_back(SP_ITEM(i2->data));
 846                             }
 847                         }
 848                     }
 849                     g_slist_free ((GSList *) selected);
 850
 851                     selection->clear();
 852                     selection->add(putBacks.begin(), putBacks.end());
 853                 }
 854             } else {
 855                 // TODO finish
 856             }
 857
 858
 859             // Remove the eraser stroke itself:
 860             sp_repr_unparent( dc->repr );
 861             dc->repr = 0;
 862         }
 863 //         SP_OBJECT(item)->deleteObject(propagate, propagate_descendants);
 864 //         sp_object_unref((SPObject *)item, NULL);
 865     } else {
 866         if (dc->repr) {
 867             sp_repr_unparent(dc->repr);
 868             dc->repr = 0;
 869         }
 870     }
 871
 872     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ERASER,
 873                      _("Draw eraser stroke"));
 874 }
 875
 876 static void
 877 add_cap(SPCurve *curve,
 878         NR::Point const &pre, NR::Point const &from,
 879         NR::Point const &to, NR::Point const &post,
 880         double rounding)
 881 {
 882     NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
 883     double mag = NR::L2(vel);
 884
 885     NR::Point v_in = from - pre;
 886     double mag_in = NR::L2(v_in);
 887     if ( mag_in > ERASER_EPSILON ) {
 888         v_in = mag * v_in / mag_in;
 889     } else {
 890         v_in = NR::Point(0, 0);
 891     }
 892
 893     NR::Point v_out = to - post;
 894     double mag_out = NR::L2(v_out);
 895     if ( mag_out > ERASER_EPSILON ) {
 896         v_out = mag * v_out / mag_out;
 897     } else {
 898         v_out = NR::Point(0, 0);
 899     }
 900
 901     if ( NR::L2(v_in) > ERASER_EPSILON || NR::L2(v_out) > ERASER_EPSILON ) {
 902         sp_curve_curveto(curve, from + v_in, to + v_out, to);
 903     }
 904 }
 905
 906 static void
 907 accumulate_eraser(SPEraserContext *dc)
 908 {
 909     if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
 910         sp_curve_reset(dc->accumulated); /*  Is this required ?? */
 911         SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
 912
 913         g_assert(dc->cal1->end > 1);
 914         g_assert(rev_cal2->end > 1);
 915         g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
 916         g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
 917         g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
 918         g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
 919         g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
 920         g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
 921
 922         sp_curve_append(dc->accumulated, dc->cal1, FALSE);
 923
 924         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);
 925
 926         sp_curve_append(dc->accumulated, rev_cal2, TRUE);
 927
 928         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);
 929
 930         sp_curve_closepath(dc->accumulated);
 931
 932         sp_curve_unref(rev_cal2);
 933
 934         sp_curve_reset(dc->cal1);
 935         sp_curve_reset(dc->cal2);
 936     }
 937 }
 938
 939 static double square(double const x)
 940 {
 941     return x * x;
 942 }
 943
 944 static void
 945 fit_and_split(SPEraserContext *dc, gboolean release)
 946 {
 947     double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_ERASER );
 948
 949 #ifdef ERASER_VERBOSE
 950     g_print("[F&S:R=%c]", release?'T':'F');
 951 #endif
 952
 953     if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
 954         return; // just clicked
 955
 956     if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
 957 #define BEZIER_SIZE       4
 958 #define BEZIER_MAX_BEZIERS  8
 959 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
 960
 961 #ifdef ERASER_VERBOSE
 962         g_print("[F&S:#] dc->npoints:%d, release:%s\n",
 963                 dc->npoints, release ? "TRUE" : "FALSE");
 964 #endif
 965
 966         /* Current eraser */
 967         if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
 968             /* dc->npoints > 0 */
 969             /* g_print("erasers(1|2) reset\n"); */
 970             sp_curve_reset(dc->cal1);
 971             sp_curve_reset(dc->cal2);
 972
 973             sp_curve_moveto(dc->cal1, dc->point1[0]);
 974             sp_curve_moveto(dc->cal2, dc->point2[0]);
 975         }
 976
 977         NR::Point b1[BEZIER_MAX_LENGTH];
 978         gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
 979                                                tolerance_sq, BEZIER_MAX_BEZIERS);
 980         g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
 981
 982         NR::Point b2[BEZIER_MAX_LENGTH];
 983         gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
 984                                                tolerance_sq, BEZIER_MAX_BEZIERS);
 985         g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
 986
 987         if ( nb1 != -1 && nb2 != -1 ) {
 988             /* Fit and draw and reset state */
 989 #ifdef ERASER_VERBOSE
 990             g_print("nb1:%d nb2:%d\n", nb1, nb2);
 991 #endif
 992             /* CanvasShape */
 993             if (! release) {
 994                 sp_curve_reset(dc->currentcurve);
 995                 sp_curve_moveto(dc->currentcurve, b1[0]);
 996                 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
 997                     sp_curve_curveto(dc->currentcurve, bp1[1],
 998                                      bp1[2], bp1[3]);
 999                 }
1000                 sp_curve_lineto(dc->currentcurve,
1001                                 b2[BEZIER_SIZE*(nb2-1) + 3]);
1002                 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1003                     sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1004                 }
1005                 // FIXME: dc->segments is always NULL at this point??
1006                 if (!dc->segments) { // first segment
1007                     add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1008                 }
1009                 sp_curve_closepath(dc->currentcurve);
1010                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1011             }
1012
1013             /* Current eraser */
1014             for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1015                 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1016             }
1017             for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1018                 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1019             }
1020         } else {
1021             /* fixme: ??? */
1022 #ifdef ERASER_VERBOSE
1023             g_print("[fit_and_split] failed to fit-cubic.\n");
1024 #endif
1025             draw_temporary_box(dc);
1026
1027             for (gint i = 1; i < dc->npoints; i++) {
1028                 sp_curve_lineto(dc->cal1, dc->point1[i]);
1029             }
1030             for (gint i = 1; i < dc->npoints; i++) {
1031                 sp_curve_lineto(dc->cal2, dc->point2[i]);
1032             }
1033         }
1034
1035         /* Fit and draw and copy last point */
1036 #ifdef ERASER_VERBOSE
1037         g_print("[%d]Yup\n", dc->npoints);
1038 #endif
1039         if (!release) {
1040             g_assert(!sp_curve_empty(dc->currentcurve));
1041
1042             SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1043                                                    SP_TYPE_CANVAS_BPATH,
1044                                                    NULL);
1045             SPCurve *curve = sp_curve_copy(dc->currentcurve);
1046             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1047             sp_curve_unref(curve);
1048
1049             guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1050             //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1051             double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser");
1052             double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1053             //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1054             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1055             //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1056             //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);
1057             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1058             /* fixme: Cannot we cascade it to root more clearly? */
1059             g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1060
1061             dc->segments = g_slist_prepend(dc->segments, cbp);
1062         }
1063
1064         dc->point1[0] = dc->point1[dc->npoints - 1];
1065         dc->point2[0] = dc->point2[dc->npoints - 1];
1066         dc->npoints = 1;
1067     } else {
1068         draw_temporary_box(dc);
1069     }
1070 }
1071
1072 static void
1073 draw_temporary_box(SPEraserContext *dc)
1074 {
1075     sp_curve_reset(dc->currentcurve);
1076
1077     sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1078     for (gint i = dc->npoints-2; i >= 0; i--) {
1079         sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1080     }
1081     for (gint i = 0; i < dc->npoints; i++) {
1082         sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1083     }
1084     if (dc->npoints >= 2) {
1085         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);
1086     }
1087
1088     sp_curve_closepath(dc->currentcurve);
1089     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1090 }
1091
1092 /*
1093   Local Variables:
1094   mode:c++
1095   c-file-style:"stroustrup"
1096   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1097   indent-tabs-mode:nil
1098   fill-column:99
1099   End:
1100 */
1101 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :