src/dyna-draw-context.cpp

   1 #define __SP_DYNA_DRAW_CONTEXT_C__
   2
   3 /*
   4  * Handwriting-like drawing mode
   5  *
   6  * Authors:
   7  *   Mitsuru Oka <oka326@parkcity.ne.jp>
   8  *   Lauris Kaplinski <lauris@kaplinski.com>
   9  *   bulia byak <buliabyak@users.sf.net>
  10  *   MenTaLguY <mental@rydia.net>
  11  *
  12  * The original dynadraw code:
  13  *   Paul Haeberli <paul@sgi.com>
  14  *
  15  * Copyright (C) 1998 The Free Software Foundation
  16  * Copyright (C) 1999-2005 authors
  17  * Copyright (C) 2001-2002 Ximian, Inc.
  18  * Copyright (C) 2005-2007 bulia byak
  19  * Copyright (C) 2006 MenTaLguY
  20  *
  21  * Released under GNU GPL, read the file 'COPYING' for more information
  22  */
  23
  24 #define noDYNA_DRAW_VERBOSE
  25
  26 #include "config.h"
  27
  28 #include <gtk/gtk.h>
  29 #include <gdk/gdkkeysyms.h>
  30 #include <glibmm/i18n.h>
  31
  32 #include <numeric>
  33
  34 #include "svg/svg.h"
  35 #include "display/canvas-bpath.h"
  36 #include "display/bezier-utils.h"
  37
  38 #include <glib/gmem.h>
  39 #include "macros.h"
  40 #include "document.h"
  41 #include "selection.h"
  42 #include "desktop.h"
  43 #include "desktop-events.h"
  44 #include "desktop-handles.h"
  45 #include "desktop-affine.h"
  46 #include "desktop-style.h"
  47 #include "message-context.h"
  48 #include "pixmaps/cursor-calligraphy.xpm"
  49 #include "pixmaps/cursor-thin.xpm"
  50 #include "pixmaps/cursor-thicken.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 "dyna-draw-context.h"
  71
  72 #define DDC_RED_RGBA 0xff0000ff
  73
  74 #define TOLERANCE_CALLIGRAPHIC 0.1
  75
  76 #define DYNA_EPSILON 0.5e-6
  77 #define DYNA_EPSILON_START 0.5e-2
  78 #define DYNA_VEL_START 1e-5
  79
  80 #define DYNA_MIN_WIDTH 1.0e-6
  81
  82 #define DRAG_MIN 0.0
  83 #define DRAG_DEFAULT 1.0
  84 #define DRAG_MAX 1.0
  85
  86 // FIXME: move it to some shared file to be reused by both calligraphy and dropper
  87 #define C1 0.552
  88 static NArtBpath const hatch_area_circle[] = {
  89     { NR_MOVETO, 0, 0, 0, 0, -1, 0 },
  90     { NR_CURVETO, -1, C1, -C1, 1, 0, 1 },
  91     { NR_CURVETO, C1, 1, 1, C1, 1, 0 },
  92     { NR_CURVETO, 1, -C1, C1, -1, 0, -1 },
  93     { NR_CURVETO, -C1, -1, -1, -C1, -1, 0 },
  94     { NR_END, 0, 0, 0, 0, 0, 0 }
  95 };
  96 #undef C1
  97
  98
  99 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
 100 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
 101 static void sp_dyna_draw_context_dispose(GObject *object);
 102
 103 static void sp_dyna_draw_context_setup(SPEventContext *ec);
 104 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
 105 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
 106
 107 static void clear_current(SPDynaDrawContext *dc);
 108 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize);
 109 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
 110 static void accumulate_calligraphic(SPDynaDrawContext *dc);
 111
 112 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
 113
 114 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
 115 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
 116 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
 117 static void draw_temporary_box(SPDynaDrawContext *dc);
 118
 119
 120 static SPEventContextClass *parent_class;
 121
 122 GtkType
 123 sp_dyna_draw_context_get_type(void)
 124 {
 125     static GType type = 0;
 126     if (!type) {
 127         GTypeInfo info = {
 128             sizeof(SPDynaDrawContextClass),
 129             NULL, NULL,
 130             (GClassInitFunc) sp_dyna_draw_context_class_init,
 131             NULL, NULL,
 132             sizeof(SPDynaDrawContext),
 133             4,
 134             (GInstanceInitFunc) sp_dyna_draw_context_init,
 135             NULL,   /* value_table */
 136         };
 137         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
 138     }
 139     return type;
 140 }
 141
 142 static void
 143 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
 144 {
 145     GObjectClass *object_class = (GObjectClass *) klass;
 146     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 147
 148     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 149
 150     object_class->dispose = sp_dyna_draw_context_dispose;
 151
 152     event_context_class->setup = sp_dyna_draw_context_setup;
 153     event_context_class->set = sp_dyna_draw_context_set;
 154     event_context_class->root_handler = sp_dyna_draw_context_root_handler;
 155 }
 156
 157 static void
 158 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
 159 {
 160     SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
 161
 162     event_context->cursor_shape = cursor_calligraphy_xpm;
 163     event_context->hot_x = 4;
 164     event_context->hot_y = 4;
 165
 166     ddc->accumulated = NULL;
 167     ddc->segments = NULL;
 168     ddc->currentcurve = NULL;
 169     ddc->currentshape = NULL;
 170     ddc->npoints = 0;
 171     ddc->cal1 = NULL;
 172     ddc->cal2 = NULL;
 173     ddc->repr = NULL;
 174
 175     /* DynaDraw values */
 176     ddc->cur = NR::Point(0,0);
 177     ddc->last = NR::Point(0,0);
 178     ddc->vel = NR::Point(0,0);
 179     ddc->vel_max = 0;
 180     ddc->acc = NR::Point(0,0);
 181     ddc->ang = NR::Point(0,0);
 182     ddc->del = NR::Point(0,0);
 183
 184     /* attributes */
 185     ddc->dragging = FALSE;
 186
 187     ddc->mass = 0.3;
 188     ddc->drag = DRAG_DEFAULT;
 189     ddc->angle = 30.0;
 190     ddc->width = 0.2;
 191     ddc->pressure = DDC_DEFAULT_PRESSURE;
 192
 193     ddc->vel_thin = 0.1;
 194     ddc->flatness = 0.9;
 195     ddc->cap_rounding = 0.0;
 196
 197     ddc->abs_width = false;
 198     ddc->keep_selected = true;
 199
 200     ddc->hatch_spacing = 0;
 201     ddc->hatch_spacing_step = 0;
 202     new (&ddc->hatch_pointer_past) std::list<double>();
 203     new (&ddc->hatch_nearest_past) std::list<double>();
 204     ddc->hatch_last_nearest = NR::Point(0,0);
 205     ddc->hatch_last_pointer = NR::Point(0,0);
 206     ddc->hatch_vector_accumulated = NR::Point(0,0);
 207     ddc->hatch_escaped = false;
 208     ddc->hatch_area = NULL;
 209     ddc->hatch_item = NULL;
 210     ddc->hatch_livarot_path = NULL;
 211
 212     ddc->trace_bg = false;
 213
 214     ddc->is_dilating = false;
 215 }
 216
 217 static void
 218 sp_dyna_draw_context_dispose(GObject *object)
 219 {
 220     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
 221
 222     if (ddc->hatch_area) {
 223         gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
 224         ddc->hatch_area = NULL;
 225     }
 226
 227     if (ddc->dilate_area) {
 228         gtk_object_destroy(GTK_OBJECT(ddc->dilate_area));
 229         ddc->dilate_area = NULL;
 230     }
 231
 232     if (ddc->accumulated) {
 233         ddc->accumulated = sp_curve_unref(ddc->accumulated);
 234     }
 235
 236     while (ddc->segments) {
 237         gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
 238         ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
 239     }
 240
 241     if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
 242     if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
 243     if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
 244
 245     if (ddc->currentshape) {
 246         gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
 247         ddc->currentshape = NULL;
 248     }
 249
 250     if (ddc->_message_context) {
 251         delete ddc->_message_context;
 252     }
 253
 254     G_OBJECT_CLASS(parent_class)->dispose(object);
 255
 256     ddc->hatch_pointer_past.~list();
 257     ddc->hatch_nearest_past.~list();
 258 }
 259
 260 static void
 261 sp_dyna_draw_context_setup(SPEventContext *ec)
 262 {
 263     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 264
 265     if (((SPEventContextClass *) parent_class)->setup)
 266         ((SPEventContextClass *) parent_class)->setup(ec);
 267
 268     ddc->accumulated = sp_curve_new_sized(32);
 269     ddc->currentcurve = sp_curve_new_sized(4);
 270
 271     ddc->cal1 = sp_curve_new_sized(32);
 272     ddc->cal2 = sp_curve_new_sized(32);
 273
 274     ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
 275     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
 276     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 277     /* fixme: Cannot we cascade it to root more clearly? */
 278     g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
 279
 280     {
 281         SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
 282         ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 283         sp_curve_unref(c);
 284         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
 285         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 286         sp_canvas_item_hide(ddc->hatch_area);
 287     }
 288
 289     {
 290         SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
 291         ddc->dilate_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 292         sp_curve_unref(c);
 293         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->dilate_area), 0x00000000,(SPWindRule)0);
 294         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->dilate_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 295         sp_canvas_item_hide(ddc->dilate_area);
 296     }
 297
 298     sp_event_context_read(ec, "mass");
 299     sp_event_context_read(ec, "wiggle");
 300     sp_event_context_read(ec, "angle");
 301     sp_event_context_read(ec, "width");
 302     sp_event_context_read(ec, "thinning");
 303     sp_event_context_read(ec, "tremor");
 304     sp_event_context_read(ec, "flatness");
 305     sp_event_context_read(ec, "tracebackground");
 306     sp_event_context_read(ec, "usepressure");
 307     sp_event_context_read(ec, "usetilt");
 308     sp_event_context_read(ec, "abs_width");
 309     sp_event_context_read(ec, "keep_selected");
 310     sp_event_context_read(ec, "cap_rounding");
 311
 312     ddc->is_drawing = false;
 313
 314     ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 315 }
 316
 317 static void
 318 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 319 {
 320     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 321
 322     if (!strcmp(key, "mass")) {
 323         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
 324         ddc->mass = CLAMP(dval, -1000.0, 1000.0);
 325     } else if (!strcmp(key, "wiggle")) {
 326         double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
 327         ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
 328     } else if (!strcmp(key, "angle")) {
 329         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
 330         ddc->angle = CLAMP (dval, -90, 90);
 331     } else if (!strcmp(key, "width")) {
 332         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 333         ddc->width = CLAMP(dval, -1000.0, 1000.0);
 334     } else if (!strcmp(key, "thinning")) {
 335         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 336         ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
 337     } else if (!strcmp(key, "tremor")) {
 338         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 339         ddc->tremor = CLAMP(dval, 0.0, 1.0);
 340     } else if (!strcmp(key, "flatness")) {
 341         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 342         ddc->flatness = CLAMP(dval, 0, 1.0);
 343     } else if (!strcmp(key, "tracebackground")) {
 344         ddc->trace_bg = (val && strcmp(val, "0"));
 345     } else if (!strcmp(key, "usepressure")) {
 346         ddc->usepressure = (val && strcmp(val, "0"));
 347     } else if (!strcmp(key, "usetilt")) {
 348         ddc->usetilt = (val && strcmp(val, "0"));
 349     } else if (!strcmp(key, "abs_width")) {
 350         ddc->abs_width = (val && strcmp(val, "0"));
 351     } else if (!strcmp(key, "keep_selected")) {
 352         ddc->keep_selected = (val && strcmp(val, "0"));
 353     } else if (!strcmp(key, "cap_rounding")) {
 354         ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 355     }
 356
 357     //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
 358 }
 359
 360 static double
 361 flerp(double f0, double f1, double p)
 362 {
 363     return f0 + ( f1 - f0 ) * p;
 364 }
 365
 366 /* Get normalized point */
 367 static NR::Point
 368 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
 369 {
 370     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 371     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 372     return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max,  ( v[NR::Y] - drect.min()[NR::Y] ) / max);
 373 }
 374
 375 /* Get view point */
 376 static NR::Point
 377 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
 378 {
 379     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 380     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 381     return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
 382 }
 383
 384 static void
 385 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
 386 {
 387     dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
 388     dc->vel = NR::Point(0,0);
 389     dc->vel_max = 0;
 390     dc->acc = NR::Point(0,0);
 391     dc->ang = NR::Point(0,0);
 392     dc->del = NR::Point(0,0);
 393 }
 394
 395 static void
 396 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
 397 {
 398     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
 399         dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
 400     else
 401         dc->pressure = DDC_DEFAULT_PRESSURE;
 402
 403     if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
 404         dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
 405     else
 406         dc->xtilt = DDC_DEFAULT_TILT;
 407
 408     if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
 409         dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
 410     else
 411         dc->ytilt = DDC_DEFAULT_TILT;
 412 }
 413
 414
 415 static gboolean
 416 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
 417 {
 418     NR::Point n = sp_dyna_draw_get_npoint(dc, p);
 419
 420     /* Calculate mass and drag */
 421     double const mass = flerp(1.0, 160.0, dc->mass);
 422     double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
 423
 424     /* Calculate force and acceleration */
 425     NR::Point force = n - dc->cur;
 426
 427     // If force is below the absolute threshold DYNA_EPSILON,
 428     // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
 429     // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
 430     // discard this move.
 431     // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
 432     // especially bothersome at the start of the stroke where we don't yet have the inertia to
 433     // smooth them out.
 434     if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
 435         return FALSE;
 436     }
 437
 438     dc->acc = force / mass;
 439
 440     /* Calculate new velocity */
 441     dc->vel += dc->acc;
 442
 443     if (NR::L2(dc->vel) > dc->vel_max)
 444         dc->vel_max = NR::L2(dc->vel);
 445
 446     /* Calculate angle of drawing tool */
 447
 448     double a1;
 449     if (dc->usetilt) {
 450         // 1a. calculate nib angle from input device tilt:
 451         gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
 452
 453         if (length > 0) {
 454             NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
 455             a1 = atan2(ang1);
 456         }
 457         else
 458             a1 = 0.0;
 459     }
 460     else {
 461         // 1b. fixed dc->angle (absolutely flat nib):
 462         double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
 463         NR::Point ang1 = NR::Point(-sin(radians),  cos(radians));
 464         a1 = atan2(ang1);
 465     }
 466
 467     // 2. perpendicular to dc->vel (absolutely non-flat nib):
 468     gdouble const mag_vel = NR::L2(dc->vel);
 469     if ( mag_vel < DYNA_EPSILON ) {
 470         return FALSE;
 471     }
 472     NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
 473
 474     // 3. Average them using flatness parameter:
 475     // calculate angles
 476     double a2 = atan2(ang2);
 477     // flip a2 to force it to be in the same half-circle as a1
 478     bool flipped = false;
 479     if (fabs (a2-a1) > 0.5*M_PI) {
 480         a2 += M_PI;
 481         flipped = true;
 482     }
 483     // normalize a2
 484     if (a2 > M_PI)
 485         a2 -= 2*M_PI;
 486     if (a2 < -M_PI)
 487         a2 += 2*M_PI;
 488     // find the flatness-weighted bisector angle, unflip if a2 was flipped
 489     // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
 490     double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
 491
 492     // Try to detect a sudden flip when the new angle differs too much from the previous for the
 493     // current velocity; in that case discard this move
 494     double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
 495     if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
 496         return FALSE;
 497     }
 498
 499     // convert to point
 500     dc->ang = NR::Point (cos (new_ang), sin (new_ang));
 501
 502 //    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);
 503
 504     /* Apply drag */
 505     dc->vel *= 1.0 - drag;
 506
 507     /* Update position */
 508     dc->last = dc->cur;
 509     dc->cur += dc->vel;
 510
 511     return TRUE;
 512 }
 513
 514 static void
 515 sp_dyna_draw_brush(SPDynaDrawContext *dc)
 516 {
 517     g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
 518
 519     // How much velocity thins strokestyle
 520     double vel_thin = flerp (0, 160, dc->vel_thin);
 521
 522     // Influence of pressure on thickness
 523     double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
 524
 525     // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
 526     // drag)
 527     NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
 528     NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
 529
 530     double trace_thick = 1;
 531     if (dc->trace_bg) {
 532         // pick single pixel
 533         NRPixBlock pb;
 534         int x = (int) floor(brush_w[NR::X]);
 535         int y = (int) floor(brush_w[NR::Y]);
 536         nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
 537         sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
 538         const unsigned char *s = NR_PIXBLOCK_PX(&pb);
 539         double R = s[0] / 255.0;
 540         double G = s[1] / 255.0;
 541         double B = s[2] / 255.0;
 542         double A = s[3] / 255.0;
 543         double max = MAX (MAX (R, G), B);
 544         double min = MIN (MIN (R, G), B);
 545         double L = A * (max + min)/2 + (1 - A); // blend with white bg
 546         trace_thick = 1 - L;
 547         //g_print ("L %g thick %g\n", L, trace_thick);
 548     }
 549
 550     double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
 551
 552     double tremble_left = 0, tremble_right = 0;
 553     if (dc->tremor > 0) {
 554         // obtain two normally distributed random variables, using polar Box-Muller transform
 555         double x1, x2, w, y1, y2;
 556         do {
 557             x1 = 2.0 * g_random_double_range(0,1) - 1.0;
 558             x2 = 2.0 * g_random_double_range(0,1) - 1.0;
 559             w = x1 * x1 + x2 * x2;
 560         } while ( w >= 1.0 );
 561         w = sqrt( (-2.0 * log( w ) ) / w );
 562         y1 = x1 * w;
 563         y2 = x2 * w;
 564
 565         // deflect both left and right edges randomly and independently, so that:
 566         // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
 567         // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
 568         // (3) deflection somewhat depends on speed, to prevent fast strokes looking
 569         // comparatively smooth and slow ones excessively jittery
 570         tremble_left  = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 571         tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 572     }
 573
 574     if ( width < 0.02 * dc->width ) {
 575         width = 0.02 * dc->width;
 576     }
 577
 578     double dezoomify_factor = 0.05 * 1000;
 579     if (!dc->abs_width) {
 580         dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 581     }
 582
 583     NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
 584     NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
 585
 586     dc->point1[dc->npoints] = brush + del_left;
 587     dc->point2[dc->npoints] = brush - del_right;
 588
 589     dc->del = 0.5*(del_left + del_right);
 590
 591     dc->npoints++;
 592 }
 593
 594 double
 595 get_dilate_radius (SPDynaDrawContext *dc)
 596 {
 597     // 10 times the pen width:
 598     return 500 * dc->width/SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 599 }
 600
 601 double
 602 get_dilate_force (SPDynaDrawContext *dc)
 603 {
 604     double force = 4 * dc->pressure/SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 605     if (force > 3) {
 606         force += 8 * (force - 3);
 607     }
 608     return force;
 609 }
 610
 611 bool
 612 sp_ddc_dilate_recursive (SPItem *item, NR::Point p, bool expand, double radius, double offset)
 613 {
 614     bool did = false;
 615
 616     if (SP_IS_GROUP(item)) {
 617         for (SPObject *child = sp_object_first_child(SP_OBJECT(item)) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
 618             if (SP_IS_ITEM(child)) {
 619                 did = did || sp_ddc_dilate_recursive (SP_ITEM(child), p, expand, radius, offset);
 620             }
 621         }
 622
 623     } else if (SP_IS_PATH(item)) {
 624
 625         SPCurve *curve = NULL;
 626         curve = sp_shape_get_curve(SP_SHAPE(item));
 627         if (curve == NULL)
 628             return false;
 629
 630         // skip those paths whose bboxes are entirely out of reach with our radius
 631         NR::Maybe<NR::Rect> bbox = item->getBounds(sp_item_i2doc_affine(item));
 632         if (bbox) {
 633             bbox->growBy(radius);
 634             if (!bbox->contains(p)) {
 635                 return false;
 636             }
 637         }
 638
 639         Path *orig = Path_for_item(item, false);
 640         if (orig == NULL) {
 641             sp_curve_unref(curve);
 642             return false;
 643         }
 644         Path *res = new Path;
 645         res->SetBackData(false);
 646
 647         Shape *theShape = new Shape;
 648         Shape *theRes = new Shape;
 649
 650         orig->ConvertWithBackData(0.05);
 651         orig->Fill(theShape, 0);
 652
 653         SPCSSAttr *css = sp_repr_css_attr(SP_OBJECT_REPR(item), "style");
 654         gchar const *val = sp_repr_css_property(css, "fill-rule", NULL);
 655         if (val && strcmp(val, "nonzero") == 0)
 656         {
 657             theRes->ConvertToShape(theShape, fill_nonZero);
 658         }
 659         else if (val && strcmp(val, "evenodd") == 0)
 660         {
 661             theRes->ConvertToShape(theShape, fill_oddEven);
 662         }
 663         else
 664         {
 665             theRes->ConvertToShape(theShape, fill_nonZero);
 666         }
 667
 668         bool did_this = false;
 669         NR::Matrix i2doc(sp_item_i2doc_affine(item));
 670         if (theShape->MakeOffset(theRes,
 671                                  expand? offset : -offset,
 672                                  join_straight, butt_straight,
 673                                  true, p[NR::X], p[NR::Y], radius, &i2doc) == 0) // 0 means the shape was actually changed
 674             did_this = true;
 675
 676         // the rest only makes sense if we actually changed the path
 677         if (did_this) {
 678             theRes->ConvertToShape(theShape, fill_positive);
 679
 680             res->Reset();
 681             theRes->ConvertToForme(res);
 682
 683             if (offset >= 0.5)
 684             {
 685                 res->ConvertEvenLines(0.5);
 686                 res->Simplify(0.5);
 687             }
 688             else
 689             {
 690                 res->ConvertEvenLines(0.5*offset);
 691                 res->Simplify(0.5 * offset);
 692             }
 693
 694             sp_curve_unref(curve);
 695             if (res->descr_cmd.size() > 1) {
 696                 gchar *str = res->svg_dump_path();
 697                 SP_OBJECT_REPR(item)->setAttribute("d", str);
 698                 g_free(str);
 699             } else {
 700                 // TODO: if there's 0 or 1 node left, delete this path altogether
 701             }
 702         }
 703
 704         delete theShape;
 705         delete theRes;
 706         delete orig;
 707         delete res;
 708
 709         if (did_this)
 710             did = true;
 711     }
 712
 713     return did;
 714 }
 715
 716
 717 bool
 718 sp_ddc_dilate (SPDynaDrawContext *dc, NR::Point p, bool expand)
 719 {
 720     Inkscape::Selection *selection = sp_desktop_selection(SP_EVENT_CONTEXT(dc)->desktop);
 721
 722     if (selection->isEmpty()) {
 723         return false;
 724     }
 725
 726     bool did = false;
 727     double radius = get_dilate_radius(dc);
 728     double offset = get_dilate_force(dc);
 729     if (radius == 0 || offset == 0) {
 730         return false;
 731     }
 732
 733     for (GSList *items = g_slist_copy((GSList *) selection->itemList());
 734          items != NULL;
 735          items = items->next) {
 736
 737         SPItem *item = (SPItem *) items->data;
 738
 739         did = did || sp_ddc_dilate_recursive (item, p, expand, radius, offset);
 740
 741     }
 742
 743     return did;
 744 }
 745
 746 void
 747 sp_ddc_update_cursors (SPDynaDrawContext *dc)
 748 {
 749     if (dc->is_dilating) {
 750         double radius = get_dilate_radius(dc);
 751         NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(SP_EVENT_CONTEXT(dc)->desktop->point()));
 752         sp_canvas_item_affine_absolute(dc->dilate_area, sm);
 753         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 754         sp_canvas_item_show(dc->dilate_area);
 755     }
 756 }
 757
 758 void
 759 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
 760 {
 761     desktop->setToolboxAdjustmentValue (id, value);
 762 }
 763
 764 static void
 765 calligraphic_cancel(SPDynaDrawContext *dc)
 766 {
 767     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 768     dc->dragging = FALSE;
 769     dc->is_drawing = false;
 770     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
 771             /* Remove all temporary line segments */
 772             while (dc->segments) {
 773                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 774                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 775             }
 776             /* reset accumulated curve */
 777             sp_curve_reset(dc->accumulated);
 778             clear_current(dc);
 779             if (dc->repr) {
 780                 dc->repr = NULL;
 781             }
 782 }
 783
 784
 785 gint
 786 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
 787                                   GdkEvent *event)
 788 {
 789     SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
 790     SPDesktop *desktop = event_context->desktop;
 791
 792     gint ret = FALSE;
 793
 794     switch (event->type) {
 795         case GDK_BUTTON_PRESS:
 796             if ( event->button.button == 1 ) {
 797
 798                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 799
 800                 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 801                     return TRUE;
 802                 }
 803
 804                 NR::Point const button_w(event->button.x,
 805                                          event->button.y);
 806                 NR::Point const button_dt(desktop->w2d(button_w));
 807                 sp_dyna_draw_reset(dc, button_dt);
 808                 sp_dyna_draw_extinput(dc, event);
 809                 sp_dyna_draw_apply(dc, button_dt);
 810                 sp_curve_reset(dc->accumulated);
 811                 if (dc->repr) {
 812                     dc->repr = NULL;
 813                 }
 814
 815                 /* initialize first point */
 816                 dc->npoints = 0;
 817
 818                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 819                                     ( GDK_KEY_PRESS_MASK |
 820                                       GDK_BUTTON_RELEASE_MASK |
 821                                       GDK_POINTER_MOTION_MASK |
 822                                       GDK_BUTTON_PRESS_MASK ),
 823                                     NULL,
 824                                     event->button.time);
 825
 826                 ret = TRUE;
 827
 828                 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
 829                 dc->is_drawing = true;
 830             }
 831             break;
 832         case GDK_MOTION_NOTIFY:
 833         {
 834             NR::Point const motion_w(event->motion.x,
 835                                      event->motion.y);
 836             NR::Point motion_dt(desktop->w2d(motion_w));
 837             sp_dyna_draw_extinput(dc, event);
 838
 839             // draw the dilating cursor
 840             if (event->motion.state & GDK_MOD1_MASK) {
 841                 double radius = get_dilate_radius(dc);
 842                 NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(desktop->w2d(motion_w)));
 843                 sp_canvas_item_affine_absolute(dc->dilate_area, sm);
 844                 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 845                 sp_canvas_item_show(dc->dilate_area);
 846
 847                 guint num = 0;
 848                 if (!desktop->selection->isEmpty()) {
 849                     num = g_slist_length((GSList *) desktop->selection->itemList());
 850                 }
 851                 if (num == 0) {
 852                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select paths</b> to thin or thicken"));
 853                 } else {
 854                     dc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 855                                            event->motion.state & GDK_SHIFT_MASK?
 856                                            _("<b>Thickening %d</b> selected objects; without <b>Shift</b> to thin") :
 857                                            _("<b>Thinning %d</b> selected objects; with <b>Shift</b> to thicken"), num);
 858                 }
 859
 860             } else {
 861                 dc->_message_context->clear();
 862                 sp_canvas_item_hide(dc->dilate_area);
 863             }
 864
 865             // dilating:
 866             if (dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) && event->motion.state & GDK_MOD1_MASK) {
 867                 sp_ddc_dilate (dc, desktop->dt2doc(motion_dt), event->motion.state & GDK_SHIFT_MASK? true : false);
 868                 dc->is_dilating = true;
 869                 // it's slow, so prevent clogging up with events
 870                 gobble_motion_events(GDK_BUTTON1_MASK);
 871                 return TRUE;
 872             }
 873
 874
 875             // for hatching:
 876             double hatch_dist = 0;
 877             NR::Point hatch_unit_vector(0,0);
 878             NR::Point nearest(0,0);
 879             NR::Point pointer(0,0);
 880             NR::Matrix motion_to_curve(NR::identity());
 881
 882             if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
 883
 884                 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
 885                 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
 886                     // One item selected, and it's a path;
 887                     // let's try to track it as a guide
 888
 889                     if (selected != dc->hatch_item) {
 890                         dc->hatch_item = selected;
 891                         if (dc->hatch_livarot_path)
 892                             delete dc->hatch_livarot_path;
 893                         dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
 894                         dc->hatch_livarot_path->ConvertWithBackData(0.01);
 895                     }
 896
 897                     // calculate pointer point in the guide item's coords
 898                     motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected);
 899                     pointer = motion_dt * motion_to_curve;
 900
 901                     // calculate the nearest point on the guide path
 902                     NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
 903                     nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
 904
 905
 906                     // distance from pointer to nearest
 907                     hatch_dist = NR::L2(pointer - nearest);
 908                     // unit-length vector
 909                     hatch_unit_vector = (pointer - nearest)/hatch_dist;
 910
 911                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
 912                 } else {
 913                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
 914                 }
 915             }
 916
 917             if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
 918                 dc->dragging = TRUE;
 919
 920                 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
 921
 922 #define SPEED_ELEMENTS 12
 923 #define SPEED_MIN 0.12
 924 #define SPEED_NORMAL 0.65
 925
 926                     // speed is the movement of the nearest point along the guide path, divided by
 927                     // the movement of the pointer at the same period; it is averaged for the last
 928                     // SPEED_ELEMENTS motion events.  Normally, as you track the guide path, speed
 929                     // is about 1, i.e. the nearest point on the path is moved by about the same
 930                     // distance as the pointer. If the speed starts to decrease, we are losing
 931                     // contact with the guide; if it drops below SPEED_MIN, we are on our own and
 932                     // not attracted to guide anymore. Most often this happens when you have
 933                     // tracked to the end of a guide calligraphic stroke and keep moving
 934                     // further. We try to handle this situation gracefully: not stick with the
 935                     // guide forever but let go of it smoothly and without sharp jerks (non-zero
 936                     // mass recommended; with zero mass, jerks are still quite noticeable).
 937
 938                     double speed = 1;
 939                     if (NR::L2(dc->hatch_last_nearest) != 0) {
 940                         // the distance nearest moved since the last motion event
 941                         double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest);
 942                         // the distance pointer moved since the last motion event
 943                         double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer);
 944                         // store them in stacks limited to SPEED_ELEMENTS
 945                         dc->hatch_nearest_past.push_front(nearest_moved);
 946                         if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
 947                             dc->hatch_nearest_past.pop_back();
 948                         dc->hatch_pointer_past.push_front(pointer_moved);
 949                         if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
 950                             dc->hatch_pointer_past.pop_back();
 951
 952                         // If the stacks are full,
 953                         if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
 954                             // calculate the sums of all stored movements
 955                             double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
 956                             double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
 957                             // and divide to get the speed
 958                             speed = nearest_sum/pointer_sum;
 959                             //g_print ("nearest sum %g  pointer_sum %g  speed %g\n", nearest_sum, pointer_sum, speed);
 960                         }
 961                     }
 962
 963                     if (   dc->hatch_escaped  // already escaped, do not reattach
 964                         || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
 965                         || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
 966                         ) {
 967                         // We are NOT attracted to the guide!
 968
 969                         //g_print ("\nlast_nearest %g %g   nearest %g %g  pointer %g %g  pos %d %g\n", dc->last_nearest[NR::X], dc->last_nearest[NR::Y], nearest[NR::X], nearest[NR::Y], pointer[NR::X], pointer[NR::Y], position->piece, position->t);
 970
 971                         // Remember hatch_escaped so we don't get
 972                         // attracted again until the end of this stroke
 973                         dc->hatch_escaped = true;
 974
 975                     } else {
 976
 977                         // Calculate angle cosine of this vector-to-guide and all past vectors
 978                         // summed, to detect if we accidentally flipped to the other side of the
 979                         // guide
 980                         double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
 981                         dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated);
 982
 983                         if (dc->hatch_spacing != 0) { // spacing was already set
 984                             double target;
 985                             if (speed > SPEED_NORMAL) {
 986                                 // all ok, strictly obey the spacing
 987                                 target = dc->hatch_spacing;
 988                             } else {
 989                                 // looks like we're starting to lose speed,
 990                                 // so _gradually_ let go attraction to prevent jerks
 991                                 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
 992                             }
 993                             if (!isNaN(dot) && dot < -0.5) {// flip
 994                                 target = -target;
 995                             }
 996
 997                             // This is the track pointer that we will use instead of the real one
 998                             NR::Point new_pointer = nearest + target * hatch_unit_vector;
 999
1000                             // some limited feedback: allow persistent pulling to slightly change
1001                             // the spacing
1002                             dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
1003
1004                             // return it to the desktop coords
1005                             motion_dt = new_pointer * motion_to_curve.inverse();
1006
1007                         } else {
1008                             // this is the first motion event, set the dist
1009                             dc->hatch_spacing = hatch_dist;
1010                         }
1011
1012                         // remember last points
1013                         dc->hatch_last_pointer = pointer;
1014                         dc->hatch_last_nearest = nearest;
1015                         dc->hatch_vector_accumulated += (pointer - nearest);
1016                     }
1017
1018                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
1019
1020                 } else {
1021                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
1022                 }
1023
1024                 if (!sp_dyna_draw_apply(dc, motion_dt)) {
1025                     ret = TRUE;
1026                     break;
1027                 }
1028
1029                 if ( dc->cur != dc->last ) {
1030                     sp_dyna_draw_brush(dc);
1031                     g_assert( dc->npoints > 0 );
1032                     fit_and_split(dc, FALSE);
1033                 }
1034                 ret = TRUE;
1035             }
1036
1037             // Draw the hatching circle if necessary
1038             if (event->motion.state & GDK_CONTROL_MASK) {
1039                 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
1040                     // Haven't set spacing yet: gray, center free, update radius live
1041                     NR::Point c = desktop->w2d(motion_w);
1042                     NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * NR::translate(c));
1043                     sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1044                     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1045                     sp_canvas_item_show(dc->hatch_area);
1046                 } else if (dc->dragging && !dc->hatch_escaped) {
1047                     // Tracking: green, center snapped, fixed radius
1048                     NR::Point c = motion_dt;
1049                     NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1050                     sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1051                     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1052                     sp_canvas_item_show(dc->hatch_area);
1053                 } else if (dc->dragging && dc->hatch_escaped) {
1054                     // Tracking escaped: red, center free, fixed radius
1055                     NR::Point c = desktop->w2d(motion_w);
1056                     NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1057
1058                     sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1059                     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1060                     sp_canvas_item_show(dc->hatch_area);
1061                 } else {
1062                     // Not drawing but spacing set: gray, center snapped, fixed radius
1063                     NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
1064                     if (!isNaN(c[NR::X]) && !isNaN(c[NR::Y])) {
1065                         NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1066                         sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1067                         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1068                         sp_canvas_item_show(dc->hatch_area);
1069                     }
1070                 }
1071             } else {
1072                 sp_canvas_item_hide(dc->hatch_area);
1073             }
1074         }
1075         break;
1076
1077
1078     case GDK_BUTTON_RELEASE:
1079         sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
1080         sp_canvas_end_forced_full_redraws(desktop->canvas);
1081         dc->is_drawing = false;
1082
1083         if ( dc->is_dilating && event->button.button == 1 ) {
1084             dc->is_dilating = false;
1085             sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(dc)->desktop),
1086                          SP_VERB_CONTEXT_CALLIGRAPHIC,
1087                          (event->button.state & GDK_SHIFT_MASK ? _("Thicken paths") : _("Thin paths")));
1088             ret = TRUE;
1089         } else if ( dc->dragging && event->button.button == 1 ) {
1090             dc->dragging = FALSE;
1091
1092             NR::Point const motion_w(event->button.x, event->button.y);
1093             NR::Point const motion_dt(desktop->w2d(motion_w));
1094             sp_dyna_draw_apply(dc, motion_dt);
1095
1096             /* Remove all temporary line segments */
1097             while (dc->segments) {
1098                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
1099                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
1100             }
1101
1102             /* Create object */
1103             fit_and_split(dc, TRUE);
1104             accumulate_calligraphic(dc);
1105             set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
1106
1107             /* reset accumulated curve */
1108             sp_curve_reset(dc->accumulated);
1109
1110             clear_current(dc);
1111             if (dc->repr) {
1112                 dc->repr = NULL;
1113             }
1114
1115             if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
1116             if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
1117             dc->hatch_last_nearest = NR::Point(0,0);
1118             dc->hatch_last_pointer = NR::Point(0,0);
1119             dc->hatch_vector_accumulated = NR::Point(0,0);
1120             dc->hatch_escaped = false;
1121             dc->hatch_item = NULL;
1122             dc->hatch_livarot_path = NULL;
1123
1124             if (dc->hatch_spacing != 0 && !dc->keep_selected) {
1125                 // we do not select the newly drawn path, so increase spacing by step
1126                 if (dc->hatch_spacing_step == 0) {
1127                     dc->hatch_spacing_step = dc->hatch_spacing;
1128                 }
1129                 dc->hatch_spacing += dc->hatch_spacing_step;
1130             }
1131
1132             dc->_message_context->clear();
1133             ret = TRUE;
1134         }
1135         break;
1136
1137     case GDK_KEY_PRESS:
1138         switch (get_group0_keyval (&event->key)) {
1139         case GDK_Up:
1140         case GDK_KP_Up:
1141             if (!MOD__CTRL_ONLY) {
1142                 dc->angle += 5.0;
1143                 if (dc->angle > 90.0)
1144                     dc->angle = 90.0;
1145                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
1146                 ret = TRUE;
1147             }
1148             break;
1149         case GDK_Down:
1150         case GDK_KP_Down:
1151             if (!MOD__CTRL_ONLY) {
1152                 dc->angle -= 5.0;
1153                 if (dc->angle < -90.0)
1154                     dc->angle = -90.0;
1155                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
1156                 ret = TRUE;
1157             }
1158             break;
1159         case GDK_Right:
1160         case GDK_KP_Right:
1161             if (!MOD__CTRL_ONLY) {
1162                 dc->width += 0.01;
1163                 if (dc->width > 1.0)
1164                     dc->width = 1.0;
1165                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
1166                 sp_ddc_update_cursors(dc);
1167                 ret = TRUE;
1168             }
1169             break;
1170         case GDK_Left:
1171         case GDK_KP_Left:
1172             if (!MOD__CTRL_ONLY) {
1173                 dc->width -= 0.01;
1174                 if (dc->width < 0.01)
1175                     dc->width = 0.01;
1176                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1177                 sp_ddc_update_cursors(dc);
1178                 ret = TRUE;
1179             }
1180             break;
1181         case GDK_Home:
1182         case GDK_KP_Home:
1183             dc->width = 0.01;
1184             sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1185             sp_ddc_update_cursors(dc);
1186             ret = TRUE;
1187             break;
1188         case GDK_End:
1189         case GDK_KP_End:
1190             dc->width = 1.0;
1191             sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1192             sp_ddc_update_cursors(dc);
1193             ret = TRUE;
1194             break;
1195         case GDK_x:
1196         case GDK_X:
1197             if (MOD__ALT_ONLY) {
1198                 desktop->setToolboxFocusTo ("altx-calligraphy");
1199                 ret = TRUE;
1200             }
1201             break;
1202         case GDK_Escape:
1203             if (dc->is_drawing) {
1204                 // if drawing, cancel, otherwise pass it up for deselecting
1205                 calligraphic_cancel (dc);
1206                 ret = TRUE;
1207             }
1208             break;
1209         case GDK_z:
1210         case GDK_Z:
1211             if (MOD__CTRL_ONLY && dc->is_drawing) {
1212                 // if drawing, cancel, otherwise pass it up for undo
1213                 calligraphic_cancel (dc);
1214                 ret = TRUE;
1215             }
1216             break;
1217         case GDK_Meta_L:
1218         case GDK_Meta_R:
1219             event_context->cursor_shape = cursor_thicken_xpm;
1220             sp_event_context_update_cursor(event_context);
1221             break;
1222         case GDK_Alt_L:
1223         case GDK_Alt_R:
1224             if (MOD__SHIFT) {
1225                 event_context->cursor_shape = cursor_thicken_xpm;
1226                 sp_event_context_update_cursor(event_context);
1227             } else {
1228                 event_context->cursor_shape = cursor_thin_xpm;
1229                 sp_event_context_update_cursor(event_context);
1230             }
1231             break;
1232         case GDK_Shift_L:
1233         case GDK_Shift_R:
1234             if (MOD__ALT) {
1235                 event_context->cursor_shape = cursor_thicken_xpm;
1236                 sp_event_context_update_cursor(event_context);
1237             }
1238             break;
1239         default:
1240             break;
1241         }
1242         break;
1243
1244     case GDK_KEY_RELEASE:
1245         switch (get_group0_keyval(&event->key)) {
1246             case GDK_Control_L:
1247             case GDK_Control_R:
1248                 dc->_message_context->clear();
1249                 dc->hatch_spacing = 0;
1250                 dc->hatch_spacing_step = 0;
1251                 break;
1252             case GDK_Alt_L:
1253             case GDK_Alt_R:
1254                 event_context->cursor_shape = cursor_calligraphy_xpm;
1255                 sp_event_context_update_cursor(event_context);
1256                 break;
1257             case GDK_Shift_L:
1258             case GDK_Shift_R:
1259                 if (MOD__ALT) {
1260                     event_context->cursor_shape = cursor_thin_xpm;
1261                     sp_event_context_update_cursor(event_context);
1262                 }
1263                 break;
1264             case GDK_Meta_L:
1265             case GDK_Meta_R:
1266                 event_context->cursor_shape = cursor_calligraphy_xpm;
1267                 sp_event_context_update_cursor(event_context);
1268             break;
1269             default:
1270                 break;
1271         }
1272
1273     default:
1274         break;
1275     }
1276
1277     if (!ret) {
1278         if (((SPEventContextClass *) parent_class)->root_handler) {
1279             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1280         }
1281     }
1282
1283     return ret;
1284 }
1285
1286
1287 static void
1288 clear_current(SPDynaDrawContext *dc)
1289 {
1290     /* reset bpath */
1291     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
1292     /* reset curve */
1293     sp_curve_reset(dc->currentcurve);
1294     sp_curve_reset(dc->cal1);
1295     sp_curve_reset(dc->cal2);
1296     /* reset points */
1297     dc->npoints = 0;
1298 }
1299
1300 static void
1301 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
1302 {
1303     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1304
1305     if (!sp_curve_empty(dc->accumulated)) {
1306         NArtBpath *abp;
1307         gchar *str;
1308
1309         if (!dc->repr) {
1310             /* Create object */
1311             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
1312             Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1313
1314             /* Set style */
1315             sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
1316
1317             dc->repr = repr;
1318
1319             SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
1320             Inkscape::GC::release(dc->repr);
1321             item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
1322             item->updateRepr();
1323         }
1324         abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
1325         str = sp_svg_write_path(abp);
1326         g_assert( str != NULL );
1327         g_free(abp);
1328         dc->repr->setAttribute("d", str);
1329         g_free(str);
1330
1331         if (unionize) {
1332             sp_desktop_selection(desktop)->add(dc->repr);
1333             sp_selected_path_union_skip_undo();
1334         } else {
1335             if (dc->keep_selected) {
1336                 sp_desktop_selection(desktop)->set(dc->repr);
1337             }
1338         }
1339
1340     } else {
1341         if (dc->repr) {
1342             sp_repr_unparent(dc->repr);
1343         }
1344         dc->repr = NULL;
1345     }
1346
1347     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1348                      _("Draw calligraphic stroke"));
1349 }
1350
1351 static void
1352 add_cap(SPCurve *curve,
1353         NR::Point const &pre, NR::Point const &from,
1354         NR::Point const &to, NR::Point const &post,
1355         double rounding)
1356 {
1357     NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1358     double mag = NR::L2(vel);
1359
1360     NR::Point v_in = from - pre;
1361     double mag_in = NR::L2(v_in);
1362     if ( mag_in > DYNA_EPSILON ) {
1363         v_in = mag * v_in / mag_in;
1364     } else {
1365         v_in = NR::Point(0, 0);
1366     }
1367
1368     NR::Point v_out = to - post;
1369     double mag_out = NR::L2(v_out);
1370     if ( mag_out > DYNA_EPSILON ) {
1371         v_out = mag * v_out / mag_out;
1372     } else {
1373         v_out = NR::Point(0, 0);
1374     }
1375
1376     if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
1377         sp_curve_curveto(curve, from + v_in, to + v_out, to);
1378     }
1379 }
1380
1381 static void
1382 accumulate_calligraphic(SPDynaDrawContext *dc)
1383 {
1384     if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
1385         sp_curve_reset(dc->accumulated); /*  Is this required ?? */
1386         SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
1387
1388         g_assert(dc->cal1->end > 1);
1389         g_assert(rev_cal2->end > 1);
1390         g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
1391         g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
1392         g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
1393         g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
1394         g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
1395         g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
1396
1397         sp_curve_append(dc->accumulated, dc->cal1, FALSE);
1398
1399         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);
1400
1401         sp_curve_append(dc->accumulated, rev_cal2, TRUE);
1402
1403         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);
1404
1405         sp_curve_closepath(dc->accumulated);
1406
1407         sp_curve_unref(rev_cal2);
1408
1409         sp_curve_reset(dc->cal1);
1410         sp_curve_reset(dc->cal2);
1411     }
1412 }
1413
1414 static double square(double const x)
1415 {
1416     return x * x;
1417 }
1418
1419 static void
1420 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1421 {
1422     double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
1423
1424 #ifdef DYNA_DRAW_VERBOSE
1425     g_print("[F&S:R=%c]", release?'T':'F');
1426 #endif
1427
1428     if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1429         return; // just clicked
1430
1431     if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1432 #define BEZIER_SIZE       4
1433 #define BEZIER_MAX_BEZIERS  8
1434 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1435
1436 #ifdef DYNA_DRAW_VERBOSE
1437         g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1438                 dc->npoints, release ? "TRUE" : "FALSE");
1439 #endif
1440
1441         /* Current calligraphic */
1442         if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
1443             /* dc->npoints > 0 */
1444             /* g_print("calligraphics(1|2) reset\n"); */
1445             sp_curve_reset(dc->cal1);
1446             sp_curve_reset(dc->cal2);
1447
1448             sp_curve_moveto(dc->cal1, dc->point1[0]);
1449             sp_curve_moveto(dc->cal2, dc->point2[0]);
1450         }
1451
1452         NR::Point b1[BEZIER_MAX_LENGTH];
1453         gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1454                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1455         g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1456
1457         NR::Point b2[BEZIER_MAX_LENGTH];
1458         gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1459                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1460         g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1461
1462         if ( nb1 != -1 && nb2 != -1 ) {
1463             /* Fit and draw and reset state */
1464 #ifdef DYNA_DRAW_VERBOSE
1465             g_print("nb1:%d nb2:%d\n", nb1, nb2);
1466 #endif
1467             /* CanvasShape */
1468             if (! release) {
1469                 sp_curve_reset(dc->currentcurve);
1470                 sp_curve_moveto(dc->currentcurve, b1[0]);
1471                 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1472                     sp_curve_curveto(dc->currentcurve, bp1[1],
1473                                      bp1[2], bp1[3]);
1474                 }
1475                 sp_curve_lineto(dc->currentcurve,
1476                                 b2[BEZIER_SIZE*(nb2-1) + 3]);
1477                 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1478                     sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1479                 }
1480                 // FIXME: dc->segments is always NULL at this point??
1481                 if (!dc->segments) { // first segment
1482                     add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1483                 }
1484                 sp_curve_closepath(dc->currentcurve);
1485                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1486             }
1487
1488             /* Current calligraphic */
1489             for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1490                 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1491             }
1492             for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1493                 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1494             }
1495         } else {
1496             /* fixme: ??? */
1497 #ifdef DYNA_DRAW_VERBOSE
1498             g_print("[fit_and_split] failed to fit-cubic.\n");
1499 #endif
1500             draw_temporary_box(dc);
1501
1502             for (gint i = 1; i < dc->npoints; i++) {
1503                 sp_curve_lineto(dc->cal1, dc->point1[i]);
1504             }
1505             for (gint i = 1; i < dc->npoints; i++) {
1506                 sp_curve_lineto(dc->cal2, dc->point2[i]);
1507             }
1508         }
1509
1510         /* Fit and draw and copy last point */
1511 #ifdef DYNA_DRAW_VERBOSE
1512         g_print("[%d]Yup\n", dc->npoints);
1513 #endif
1514         if (!release) {
1515             g_assert(!sp_curve_empty(dc->currentcurve));
1516
1517             SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1518                                                    SP_TYPE_CANVAS_BPATH,
1519                                                    NULL);
1520             SPCurve *curve = sp_curve_copy(dc->currentcurve);
1521             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1522             sp_curve_unref(curve);
1523
1524             guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1525             //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1526             double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
1527             double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1528             //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1529             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1530             //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1531             //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);
1532             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1533             /* fixme: Cannot we cascade it to root more clearly? */
1534             g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1535
1536             dc->segments = g_slist_prepend(dc->segments, cbp);
1537         }
1538
1539         dc->point1[0] = dc->point1[dc->npoints - 1];
1540         dc->point2[0] = dc->point2[dc->npoints - 1];
1541         dc->npoints = 1;
1542     } else {
1543         draw_temporary_box(dc);
1544     }
1545 }
1546
1547 static void
1548 draw_temporary_box(SPDynaDrawContext *dc)
1549 {
1550     sp_curve_reset(dc->currentcurve);
1551
1552     sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1553     for (gint i = dc->npoints-2; i >= 0; i--) {
1554         sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1555     }
1556     for (gint i = 0; i < dc->npoints; i++) {
1557         sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1558     }
1559     if (dc->npoints >= 2) {
1560         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);
1561     }
1562
1563     sp_curve_closepath(dc->currentcurve);
1564     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1565 }
1566
1567 /*
1568   Local Variables:
1569   mode:c++
1570   c-file-style:"stroustrup"
1571   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1572   indent-tabs-mode:nil
1573   fill-column:99
1574   End:
1575 */
1576 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :