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     ddc->has_dilated = false;
 216 }
 217
 218 static void
 219 sp_dyna_draw_context_dispose(GObject *object)
 220 {
 221     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
 222
 223     if (ddc->hatch_area) {
 224         gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
 225         ddc->hatch_area = NULL;
 226     }
 227
 228     if (ddc->dilate_area) {
 229         gtk_object_destroy(GTK_OBJECT(ddc->dilate_area));
 230         ddc->dilate_area = NULL;
 231     }
 232
 233     if (ddc->accumulated) {
 234         ddc->accumulated = sp_curve_unref(ddc->accumulated);
 235     }
 236
 237     while (ddc->segments) {
 238         gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
 239         ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
 240     }
 241
 242     if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
 243     if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
 244     if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
 245
 246     if (ddc->currentshape) {
 247         gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
 248         ddc->currentshape = NULL;
 249     }
 250
 251     if (ddc->_message_context) {
 252         delete ddc->_message_context;
 253     }
 254
 255     G_OBJECT_CLASS(parent_class)->dispose(object);
 256
 257     ddc->hatch_pointer_past.~list();
 258     ddc->hatch_nearest_past.~list();
 259 }
 260
 261 static void
 262 sp_dyna_draw_context_setup(SPEventContext *ec)
 263 {
 264     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 265
 266     if (((SPEventContextClass *) parent_class)->setup)
 267         ((SPEventContextClass *) parent_class)->setup(ec);
 268
 269     ddc->accumulated = sp_curve_new_sized(32);
 270     ddc->currentcurve = sp_curve_new_sized(4);
 271
 272     ddc->cal1 = sp_curve_new_sized(32);
 273     ddc->cal2 = sp_curve_new_sized(32);
 274
 275     ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
 276     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
 277     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 278     /* fixme: Cannot we cascade it to root more clearly? */
 279     g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
 280
 281     {
 282         SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
 283         ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 284         sp_curve_unref(c);
 285         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
 286         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 287         sp_canvas_item_hide(ddc->hatch_area);
 288     }
 289
 290     {
 291         SPCurve *c = sp_curve_new_from_foreign_bpath(hatch_area_circle);
 292         ddc->dilate_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
 293         sp_curve_unref(c);
 294         sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->dilate_area), 0x00000000,(SPWindRule)0);
 295         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->dilate_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 296         sp_canvas_item_hide(ddc->dilate_area);
 297     }
 298
 299     sp_event_context_read(ec, "mass");
 300     sp_event_context_read(ec, "wiggle");
 301     sp_event_context_read(ec, "angle");
 302     sp_event_context_read(ec, "width");
 303     sp_event_context_read(ec, "thinning");
 304     sp_event_context_read(ec, "tremor");
 305     sp_event_context_read(ec, "flatness");
 306     sp_event_context_read(ec, "tracebackground");
 307     sp_event_context_read(ec, "usepressure");
 308     sp_event_context_read(ec, "usetilt");
 309     sp_event_context_read(ec, "abs_width");
 310     sp_event_context_read(ec, "keep_selected");
 311     sp_event_context_read(ec, "cap_rounding");
 312
 313     ddc->is_drawing = false;
 314
 315     ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 316 }
 317
 318 static void
 319 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 320 {
 321     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 322
 323     if (!strcmp(key, "mass")) {
 324         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
 325         ddc->mass = CLAMP(dval, -1000.0, 1000.0);
 326     } else if (!strcmp(key, "wiggle")) {
 327         double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
 328         ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
 329     } else if (!strcmp(key, "angle")) {
 330         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
 331         ddc->angle = CLAMP (dval, -90, 90);
 332     } else if (!strcmp(key, "width")) {
 333         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 334         ddc->width = CLAMP(dval, -1000.0, 1000.0);
 335     } else if (!strcmp(key, "thinning")) {
 336         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 337         ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
 338     } else if (!strcmp(key, "tremor")) {
 339         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 340         ddc->tremor = CLAMP(dval, 0.0, 1.0);
 341     } else if (!strcmp(key, "flatness")) {
 342         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 343         ddc->flatness = CLAMP(dval, 0, 1.0);
 344     } else if (!strcmp(key, "tracebackground")) {
 345         ddc->trace_bg = (val && strcmp(val, "0"));
 346     } else if (!strcmp(key, "usepressure")) {
 347         ddc->usepressure = (val && strcmp(val, "0"));
 348     } else if (!strcmp(key, "usetilt")) {
 349         ddc->usetilt = (val && strcmp(val, "0"));
 350     } else if (!strcmp(key, "abs_width")) {
 351         ddc->abs_width = (val && strcmp(val, "0"));
 352     } else if (!strcmp(key, "keep_selected")) {
 353         ddc->keep_selected = (val && strcmp(val, "0"));
 354     } else if (!strcmp(key, "cap_rounding")) {
 355         ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 356     }
 357
 358     //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
 359 }
 360
 361 static double
 362 flerp(double f0, double f1, double p)
 363 {
 364     return f0 + ( f1 - f0 ) * p;
 365 }
 366
 367 /* Get normalized point */
 368 static NR::Point
 369 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
 370 {
 371     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 372     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 373     return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max,  ( v[NR::Y] - drect.min()[NR::Y] ) / max);
 374 }
 375
 376 /* Get view point */
 377 static NR::Point
 378 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
 379 {
 380     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 381     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 382     return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
 383 }
 384
 385 static void
 386 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
 387 {
 388     dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
 389     dc->vel = NR::Point(0,0);
 390     dc->vel_max = 0;
 391     dc->acc = NR::Point(0,0);
 392     dc->ang = NR::Point(0,0);
 393     dc->del = NR::Point(0,0);
 394 }
 395
 396 static void
 397 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
 398 {
 399     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
 400         dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
 401     else
 402         dc->pressure = DDC_DEFAULT_PRESSURE;
 403
 404     if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
 405         dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
 406     else
 407         dc->xtilt = DDC_DEFAULT_TILT;
 408
 409     if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
 410         dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
 411     else
 412         dc->ytilt = DDC_DEFAULT_TILT;
 413 }
 414
 415
 416 static gboolean
 417 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
 418 {
 419     NR::Point n = sp_dyna_draw_get_npoint(dc, p);
 420
 421     /* Calculate mass and drag */
 422     double const mass = flerp(1.0, 160.0, dc->mass);
 423     double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
 424
 425     /* Calculate force and acceleration */
 426     NR::Point force = n - dc->cur;
 427
 428     // If force is below the absolute threshold DYNA_EPSILON,
 429     // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
 430     // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
 431     // discard this move.
 432     // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
 433     // especially bothersome at the start of the stroke where we don't yet have the inertia to
 434     // smooth them out.
 435     if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
 436         return FALSE;
 437     }
 438
 439     dc->acc = force / mass;
 440
 441     /* Calculate new velocity */
 442     dc->vel += dc->acc;
 443
 444     if (NR::L2(dc->vel) > dc->vel_max)
 445         dc->vel_max = NR::L2(dc->vel);
 446
 447     /* Calculate angle of drawing tool */
 448
 449     double a1;
 450     if (dc->usetilt) {
 451         // 1a. calculate nib angle from input device tilt:
 452         gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
 453
 454         if (length > 0) {
 455             NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
 456             a1 = atan2(ang1);
 457         }
 458         else
 459             a1 = 0.0;
 460     }
 461     else {
 462         // 1b. fixed dc->angle (absolutely flat nib):
 463         double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
 464         NR::Point ang1 = NR::Point(-sin(radians),  cos(radians));
 465         a1 = atan2(ang1);
 466     }
 467
 468     // 2. perpendicular to dc->vel (absolutely non-flat nib):
 469     gdouble const mag_vel = NR::L2(dc->vel);
 470     if ( mag_vel < DYNA_EPSILON ) {
 471         return FALSE;
 472     }
 473     NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
 474
 475     // 3. Average them using flatness parameter:
 476     // calculate angles
 477     double a2 = atan2(ang2);
 478     // flip a2 to force it to be in the same half-circle as a1
 479     bool flipped = false;
 480     if (fabs (a2-a1) > 0.5*M_PI) {
 481         a2 += M_PI;
 482         flipped = true;
 483     }
 484     // normalize a2
 485     if (a2 > M_PI)
 486         a2 -= 2*M_PI;
 487     if (a2 < -M_PI)
 488         a2 += 2*M_PI;
 489     // find the flatness-weighted bisector angle, unflip if a2 was flipped
 490     // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
 491     double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
 492
 493     // Try to detect a sudden flip when the new angle differs too much from the previous for the
 494     // current velocity; in that case discard this move
 495     double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
 496     if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
 497         return FALSE;
 498     }
 499
 500     // convert to point
 501     dc->ang = NR::Point (cos (new_ang), sin (new_ang));
 502
 503 //    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);
 504
 505     /* Apply drag */
 506     dc->vel *= 1.0 - drag;
 507
 508     /* Update position */
 509     dc->last = dc->cur;
 510     dc->cur += dc->vel;
 511
 512     return TRUE;
 513 }
 514
 515 static void
 516 sp_dyna_draw_brush(SPDynaDrawContext *dc)
 517 {
 518     g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
 519
 520     // How much velocity thins strokestyle
 521     double vel_thin = flerp (0, 160, dc->vel_thin);
 522
 523     // Influence of pressure on thickness
 524     double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
 525
 526     // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
 527     // drag)
 528     NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
 529     NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
 530
 531     double trace_thick = 1;
 532     if (dc->trace_bg) {
 533         // pick single pixel
 534         NRPixBlock pb;
 535         int x = (int) floor(brush_w[NR::X]);
 536         int y = (int) floor(brush_w[NR::Y]);
 537         nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
 538         sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
 539         const unsigned char *s = NR_PIXBLOCK_PX(&pb);
 540         double R = s[0] / 255.0;
 541         double G = s[1] / 255.0;
 542         double B = s[2] / 255.0;
 543         double A = s[3] / 255.0;
 544         double max = MAX (MAX (R, G), B);
 545         double min = MIN (MIN (R, G), B);
 546         double L = A * (max + min)/2 + (1 - A); // blend with white bg
 547         trace_thick = 1 - L;
 548         //g_print ("L %g thick %g\n", L, trace_thick);
 549     }
 550
 551     double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
 552
 553     double tremble_left = 0, tremble_right = 0;
 554     if (dc->tremor > 0) {
 555         // obtain two normally distributed random variables, using polar Box-Muller transform
 556         double x1, x2, w, y1, y2;
 557         do {
 558             x1 = 2.0 * g_random_double_range(0,1) - 1.0;
 559             x2 = 2.0 * g_random_double_range(0,1) - 1.0;
 560             w = x1 * x1 + x2 * x2;
 561         } while ( w >= 1.0 );
 562         w = sqrt( (-2.0 * log( w ) ) / w );
 563         y1 = x1 * w;
 564         y2 = x2 * w;
 565
 566         // deflect both left and right edges randomly and independently, so that:
 567         // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
 568         // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
 569         // (3) deflection somewhat depends on speed, to prevent fast strokes looking
 570         // comparatively smooth and slow ones excessively jittery
 571         tremble_left  = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 572         tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 573     }
 574
 575     if ( width < 0.02 * dc->width ) {
 576         width = 0.02 * dc->width;
 577     }
 578
 579     double dezoomify_factor = 0.05 * 1000;
 580     if (!dc->abs_width) {
 581         dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 582     }
 583
 584     NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
 585     NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
 586
 587     dc->point1[dc->npoints] = brush + del_left;
 588     dc->point2[dc->npoints] = brush - del_right;
 589
 590     dc->del = 0.5*(del_left + del_right);
 591
 592     dc->npoints++;
 593 }
 594
 595 double
 596 get_dilate_radius (SPDynaDrawContext *dc)
 597 {
 598     // 10 times the pen width:
 599     return 500 * dc->width/SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 600 }
 601
 602 double
 603 get_dilate_force (SPDynaDrawContext *dc)
 604 {
 605     double force = 4 * dc->pressure/SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 606     if (force > 3) {
 607         force += 8 * (force - 3);
 608     }
 609     return force;
 610 }
 611
 612 bool
 613 sp_ddc_dilate_recursive (SPItem *item, NR::Point p, bool expand, double radius, double offset)
 614 {
 615     bool did = false;
 616
 617     if (SP_IS_GROUP(item)) {
 618         for (SPObject *child = sp_object_first_child(SP_OBJECT(item)) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
 619             if (SP_IS_ITEM(child)) {
 620                 if (sp_ddc_dilate_recursive (SP_ITEM(child), p, expand, radius, offset))
 621                     did = true;
 622             }
 623         }
 624
 625     } else if (SP_IS_PATH(item)) {
 626
 627         SPCurve *curve = NULL;
 628         curve = sp_shape_get_curve(SP_SHAPE(item));
 629         if (curve == NULL)
 630             return false;
 631
 632         // skip those paths whose bboxes are entirely out of reach with our radius
 633         NR::Maybe<NR::Rect> bbox = item->getBounds(sp_item_i2doc_affine(item));
 634         if (bbox) {
 635             bbox->growBy(radius);
 636             if (!bbox->contains(p)) {
 637                 return false;
 638             }
 639         }
 640
 641         Path *orig = Path_for_item(item, false);
 642         if (orig == NULL) {
 643             sp_curve_unref(curve);
 644             return false;
 645         }
 646         Path *res = new Path;
 647         res->SetBackData(false);
 648
 649         Shape *theShape = new Shape;
 650         Shape *theRes = new Shape;
 651
 652         orig->ConvertWithBackData(0.05);
 653         orig->Fill(theShape, 0);
 654
 655         SPCSSAttr *css = sp_repr_css_attr(SP_OBJECT_REPR(item), "style");
 656         gchar const *val = sp_repr_css_property(css, "fill-rule", NULL);
 657         if (val && strcmp(val, "nonzero") == 0)
 658         {
 659             theRes->ConvertToShape(theShape, fill_nonZero);
 660         }
 661         else if (val && strcmp(val, "evenodd") == 0)
 662         {
 663             theRes->ConvertToShape(theShape, fill_oddEven);
 664         }
 665         else
 666         {
 667             theRes->ConvertToShape(theShape, fill_nonZero);
 668         }
 669
 670         bool did_this = false;
 671         NR::Matrix i2doc(sp_item_i2doc_affine(item));
 672         if (theShape->MakeOffset(theRes,
 673                                  expand? offset : -offset,
 674                                  join_straight, butt_straight,
 675                                  true, p[NR::X], p[NR::Y], radius, &i2doc) == 0) // 0 means the shape was actually changed
 676             did_this = true;
 677
 678         // the rest only makes sense if we actually changed the path
 679         if (did_this) {
 680             theRes->ConvertToShape(theShape, fill_positive);
 681
 682             res->Reset();
 683             theRes->ConvertToForme(res);
 684
 685             if (offset >= 0.5)
 686             {
 687                 res->ConvertEvenLines(0.5);
 688                 res->Simplify(0.5);
 689             }
 690             else
 691             {
 692                 res->ConvertEvenLines(0.5*offset);
 693                 res->Simplify(0.5 * offset);
 694             }
 695
 696             sp_curve_unref(curve);
 697             if (res->descr_cmd.size() > 1) {
 698                 gchar *str = res->svg_dump_path();
 699                 SP_OBJECT_REPR(item)->setAttribute("d", str);
 700                 g_free(str);
 701             } else {
 702                 // TODO: if there's 0 or 1 node left, delete this path altogether
 703             }
 704         }
 705
 706         delete theShape;
 707         delete theRes;
 708         delete orig;
 709         delete res;
 710
 711         if (did_this)
 712             did = true;
 713     }
 714
 715     return did;
 716 }
 717
 718
 719 bool
 720 sp_ddc_dilate (SPDynaDrawContext *dc, NR::Point p, bool expand)
 721 {
 722     Inkscape::Selection *selection = sp_desktop_selection(SP_EVENT_CONTEXT(dc)->desktop);
 723
 724     if (selection->isEmpty()) {
 725         return false;
 726     }
 727
 728     bool did = false;
 729     double radius = get_dilate_radius(dc);
 730     double offset = get_dilate_force(dc);
 731     if (radius == 0 || offset == 0) {
 732         return false;
 733     }
 734
 735     for (GSList *items = g_slist_copy((GSList *) selection->itemList());
 736          items != NULL;
 737          items = items->next) {
 738
 739         SPItem *item = (SPItem *) items->data;
 740
 741         if (sp_ddc_dilate_recursive (item, p, expand, radius, offset))
 742             did = true;
 743
 744     }
 745
 746     return did;
 747 }
 748
 749 void
 750 sp_ddc_update_cursors (SPDynaDrawContext *dc)
 751 {
 752     if (dc->is_dilating) {
 753         double radius = get_dilate_radius(dc);
 754         NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(SP_EVENT_CONTEXT(dc)->desktop->point()));
 755         sp_canvas_item_affine_absolute(dc->dilate_area, sm);
 756         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 757         sp_canvas_item_show(dc->dilate_area);
 758     }
 759 }
 760
 761 void
 762 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
 763 {
 764     desktop->setToolboxAdjustmentValue (id, value);
 765 }
 766
 767 static void
 768 calligraphic_cancel(SPDynaDrawContext *dc)
 769 {
 770     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 771     dc->dragging = FALSE;
 772     dc->is_drawing = false;
 773     sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
 774             /* Remove all temporary line segments */
 775             while (dc->segments) {
 776                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 777                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 778             }
 779             /* reset accumulated curve */
 780             sp_curve_reset(dc->accumulated);
 781             clear_current(dc);
 782             if (dc->repr) {
 783                 dc->repr = NULL;
 784             }
 785 }
 786
 787
 788 gint
 789 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
 790                                   GdkEvent *event)
 791 {
 792     SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
 793     SPDesktop *desktop = event_context->desktop;
 794
 795     gint ret = FALSE;
 796
 797     switch (event->type) {
 798         case GDK_BUTTON_PRESS:
 799             if ( event->button.button == 1 ) {
 800
 801                 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 802
 803                 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 804                     return TRUE;
 805                 }
 806
 807                 NR::Point const button_w(event->button.x,
 808                                          event->button.y);
 809                 NR::Point const button_dt(desktop->w2d(button_w));
 810                 sp_dyna_draw_reset(dc, button_dt);
 811                 sp_dyna_draw_extinput(dc, event);
 812                 sp_dyna_draw_apply(dc, button_dt);
 813                 sp_curve_reset(dc->accumulated);
 814                 if (dc->repr) {
 815                     dc->repr = NULL;
 816                 }
 817
 818                 /* initialize first point */
 819                 dc->npoints = 0;
 820
 821                 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 822                                     ( GDK_KEY_PRESS_MASK |
 823                                       GDK_BUTTON_RELEASE_MASK |
 824                                       GDK_POINTER_MOTION_MASK |
 825                                       GDK_BUTTON_PRESS_MASK ),
 826                                     NULL,
 827                                     event->button.time);
 828
 829                 ret = TRUE;
 830
 831                 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
 832                 dc->is_drawing = true;
 833                 if (event->button.state & GDK_MOD1_MASK) {
 834                     dc->is_dilating = true;
 835                     dc->has_dilated = false;
 836                 }
 837             }
 838             break;
 839         case GDK_MOTION_NOTIFY:
 840         {
 841             NR::Point const motion_w(event->motion.x,
 842                                      event->motion.y);
 843             NR::Point motion_dt(desktop->w2d(motion_w));
 844             sp_dyna_draw_extinput(dc, event);
 845
 846             // draw the dilating cursor
 847             if (event->motion.state & GDK_MOD1_MASK) {
 848                 double radius = get_dilate_radius(dc);
 849                 NR::Matrix const sm (NR::scale(radius, radius) * NR::translate(desktop->w2d(motion_w)));
 850                 sp_canvas_item_affine_absolute(dc->dilate_area, sm);
 851                 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xff9900ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 852                 sp_canvas_item_show(dc->dilate_area);
 853
 854                 guint num = 0;
 855                 if (!desktop->selection->isEmpty()) {
 856                     num = g_slist_length((GSList *) desktop->selection->itemList());
 857                 }
 858                 if (num == 0) {
 859                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select paths</b> to thin or thicken"));
 860                 } else {
 861                     dc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
 862                                            event->motion.state & GDK_SHIFT_MASK?
 863                                            _("<b>Thickening %d</b> selected objects; without <b>Shift</b> to thin") :
 864                                            _("<b>Thinning %d</b> selected objects; with <b>Shift</b> to thicken"), num);
 865                 }
 866
 867             } else {
 868                 dc->_message_context->clear();
 869                 sp_canvas_item_hide(dc->dilate_area);
 870             }
 871
 872             // dilating:
 873             if (dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) && event->motion.state & GDK_MOD1_MASK) {
 874                 sp_ddc_dilate (dc, desktop->dt2doc(motion_dt), event->motion.state & GDK_SHIFT_MASK? true : false);
 875                 dc->has_dilated = true;
 876                 // it's slow, so prevent clogging up with events
 877                 gobble_motion_events(GDK_BUTTON1_MASK);
 878                 return TRUE;
 879             }
 880
 881
 882             // for hatching:
 883             double hatch_dist = 0;
 884             NR::Point hatch_unit_vector(0,0);
 885             NR::Point nearest(0,0);
 886             NR::Point pointer(0,0);
 887             NR::Matrix motion_to_curve(NR::identity());
 888
 889             if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
 890
 891                 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
 892                 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
 893                     // One item selected, and it's a path;
 894                     // let's try to track it as a guide
 895
 896                     if (selected != dc->hatch_item) {
 897                         dc->hatch_item = selected;
 898                         if (dc->hatch_livarot_path)
 899                             delete dc->hatch_livarot_path;
 900                         dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
 901                         dc->hatch_livarot_path->ConvertWithBackData(0.01);
 902                     }
 903
 904                     // calculate pointer point in the guide item's coords
 905                     motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected);
 906                     pointer = motion_dt * motion_to_curve;
 907
 908                     // calculate the nearest point on the guide path
 909                     NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
 910                     nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
 911
 912
 913                     // distance from pointer to nearest
 914                     hatch_dist = NR::L2(pointer - nearest);
 915                     // unit-length vector
 916                     hatch_unit_vector = (pointer - nearest)/hatch_dist;
 917
 918                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
 919                 } else {
 920                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
 921                 }
 922             }
 923
 924             if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
 925                 dc->dragging = TRUE;
 926
 927                 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
 928
 929 #define SPEED_ELEMENTS 12
 930 #define SPEED_MIN 0.12
 931 #define SPEED_NORMAL 0.65
 932
 933                     // speed is the movement of the nearest point along the guide path, divided by
 934                     // the movement of the pointer at the same period; it is averaged for the last
 935                     // SPEED_ELEMENTS motion events.  Normally, as you track the guide path, speed
 936                     // is about 1, i.e. the nearest point on the path is moved by about the same
 937                     // distance as the pointer. If the speed starts to decrease, we are losing
 938                     // contact with the guide; if it drops below SPEED_MIN, we are on our own and
 939                     // not attracted to guide anymore. Most often this happens when you have
 940                     // tracked to the end of a guide calligraphic stroke and keep moving
 941                     // further. We try to handle this situation gracefully: not stick with the
 942                     // guide forever but let go of it smoothly and without sharp jerks (non-zero
 943                     // mass recommended; with zero mass, jerks are still quite noticeable).
 944
 945                     double speed = 1;
 946                     if (NR::L2(dc->hatch_last_nearest) != 0) {
 947                         // the distance nearest moved since the last motion event
 948                         double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest);
 949                         // the distance pointer moved since the last motion event
 950                         double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer);
 951                         // store them in stacks limited to SPEED_ELEMENTS
 952                         dc->hatch_nearest_past.push_front(nearest_moved);
 953                         if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
 954                             dc->hatch_nearest_past.pop_back();
 955                         dc->hatch_pointer_past.push_front(pointer_moved);
 956                         if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
 957                             dc->hatch_pointer_past.pop_back();
 958
 959                         // If the stacks are full,
 960                         if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
 961                             // calculate the sums of all stored movements
 962                             double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
 963                             double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
 964                             // and divide to get the speed
 965                             speed = nearest_sum/pointer_sum;
 966                             //g_print ("nearest sum %g  pointer_sum %g  speed %g\n", nearest_sum, pointer_sum, speed);
 967                         }
 968                     }
 969
 970                     if (   dc->hatch_escaped  // already escaped, do not reattach
 971                         || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
 972                         || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
 973                         ) {
 974                         // We are NOT attracted to the guide!
 975
 976                         //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);
 977
 978                         // Remember hatch_escaped so we don't get
 979                         // attracted again until the end of this stroke
 980                         dc->hatch_escaped = true;
 981
 982                     } else {
 983
 984                         // Calculate angle cosine of this vector-to-guide and all past vectors
 985                         // summed, to detect if we accidentally flipped to the other side of the
 986                         // guide
 987                         double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
 988                         dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated);
 989
 990                         if (dc->hatch_spacing != 0) { // spacing was already set
 991                             double target;
 992                             if (speed > SPEED_NORMAL) {
 993                                 // all ok, strictly obey the spacing
 994                                 target = dc->hatch_spacing;
 995                             } else {
 996                                 // looks like we're starting to lose speed,
 997                                 // so _gradually_ let go attraction to prevent jerks
 998                                 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
 999                             }
1000                             if (!isNaN(dot) && dot < -0.5) {// flip
1001                                 target = -target;
1002                             }
1003
1004                             // This is the track pointer that we will use instead of the real one
1005                             NR::Point new_pointer = nearest + target * hatch_unit_vector;
1006
1007                             // some limited feedback: allow persistent pulling to slightly change
1008                             // the spacing
1009                             dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
1010
1011                             // return it to the desktop coords
1012                             motion_dt = new_pointer * motion_to_curve.inverse();
1013
1014                         } else {
1015                             // this is the first motion event, set the dist
1016                             dc->hatch_spacing = hatch_dist;
1017                         }
1018
1019                         // remember last points
1020                         dc->hatch_last_pointer = pointer;
1021                         dc->hatch_last_nearest = nearest;
1022                         dc->hatch_vector_accumulated += (pointer - nearest);
1023                     }
1024
1025                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
1026
1027                 } else {
1028                     dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
1029                 }
1030
1031                 if (!sp_dyna_draw_apply(dc, motion_dt)) {
1032                     ret = TRUE;
1033                     break;
1034                 }
1035
1036                 if ( dc->cur != dc->last ) {
1037                     sp_dyna_draw_brush(dc);
1038                     g_assert( dc->npoints > 0 );
1039                     fit_and_split(dc, FALSE);
1040                 }
1041                 ret = TRUE;
1042             }
1043
1044             // Draw the hatching circle if necessary
1045             if (event->motion.state & GDK_CONTROL_MASK) {
1046                 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
1047                     // Haven't set spacing yet: gray, center free, update radius live
1048                     NR::Point c = desktop->w2d(motion_w);
1049                     NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * 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), 0x7f7f7fff, 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: green, center snapped, fixed radius
1055                     NR::Point c = motion_dt;
1056                     NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1057                     sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1058                     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1059                     sp_canvas_item_show(dc->hatch_area);
1060                 } else if (dc->dragging && dc->hatch_escaped) {
1061                     // Tracking escaped: red, center free, fixed radius
1062                     NR::Point c = desktop->w2d(motion_w);
1063                     NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1064
1065                     sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1066                     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1067                     sp_canvas_item_show(dc->hatch_area);
1068                 } else {
1069                     // Not drawing but spacing set: gray, center snapped, fixed radius
1070                     NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
1071                     if (!isNaN(c[NR::X]) && !isNaN(c[NR::Y])) {
1072                         NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
1073                         sp_canvas_item_affine_absolute(dc->hatch_area, sm);
1074                         sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1075                         sp_canvas_item_show(dc->hatch_area);
1076                     }
1077                 }
1078             } else {
1079                 sp_canvas_item_hide(dc->hatch_area);
1080             }
1081         }
1082         break;
1083
1084
1085     case GDK_BUTTON_RELEASE:
1086     {
1087         NR::Point const motion_w(event->button.x, event->button.y);
1088         NR::Point const motion_dt(desktop->w2d(motion_w));
1089
1090         sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
1091         sp_canvas_end_forced_full_redraws(desktop->canvas);
1092         dc->is_drawing = false;
1093
1094         if ( dc->is_dilating && event->button.button == 1 ) {
1095             if (!dc->has_dilated) {
1096                 // if we did not rub, do a light tap
1097                 dc->pressure = 0.03;
1098                 sp_ddc_dilate (dc, desktop->dt2doc(motion_dt), event->button.state & GDK_SHIFT_MASK? true : false);
1099             }
1100             dc->is_dilating = false;
1101             dc->has_dilated = false;
1102             sp_document_done(sp_desktop_document(SP_EVENT_CONTEXT(dc)->desktop),
1103                          SP_VERB_CONTEXT_CALLIGRAPHIC,
1104                          (event->button.state & GDK_SHIFT_MASK ? _("Thicken paths") : _("Thin paths")));
1105             ret = TRUE;
1106
1107         } else if ( dc->dragging && event->button.button == 1 ) {
1108             dc->dragging = FALSE;
1109
1110             sp_dyna_draw_apply(dc, motion_dt);
1111
1112             /* Remove all temporary line segments */
1113             while (dc->segments) {
1114                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
1115                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
1116             }
1117
1118             /* Create object */
1119             fit_and_split(dc, TRUE);
1120             accumulate_calligraphic(dc);
1121             set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
1122
1123             /* reset accumulated curve */
1124             sp_curve_reset(dc->accumulated);
1125
1126             clear_current(dc);
1127             if (dc->repr) {
1128                 dc->repr = NULL;
1129             }
1130
1131             if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
1132             if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
1133             dc->hatch_last_nearest = NR::Point(0,0);
1134             dc->hatch_last_pointer = NR::Point(0,0);
1135             dc->hatch_vector_accumulated = NR::Point(0,0);
1136             dc->hatch_escaped = false;
1137             dc->hatch_item = NULL;
1138             dc->hatch_livarot_path = NULL;
1139
1140             if (dc->hatch_spacing != 0 && !dc->keep_selected) {
1141                 // we do not select the newly drawn path, so increase spacing by step
1142                 if (dc->hatch_spacing_step == 0) {
1143                     dc->hatch_spacing_step = dc->hatch_spacing;
1144                 }
1145                 dc->hatch_spacing += dc->hatch_spacing_step;
1146             }
1147
1148             dc->_message_context->clear();
1149             ret = TRUE;
1150         }
1151         break;
1152     }
1153
1154     case GDK_KEY_PRESS:
1155         switch (get_group0_keyval (&event->key)) {
1156         case GDK_Up:
1157         case GDK_KP_Up:
1158             if (!MOD__CTRL_ONLY) {
1159                 dc->angle += 5.0;
1160                 if (dc->angle > 90.0)
1161                     dc->angle = 90.0;
1162                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
1163                 ret = TRUE;
1164             }
1165             break;
1166         case GDK_Down:
1167         case GDK_KP_Down:
1168             if (!MOD__CTRL_ONLY) {
1169                 dc->angle -= 5.0;
1170                 if (dc->angle < -90.0)
1171                     dc->angle = -90.0;
1172                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
1173                 ret = TRUE;
1174             }
1175             break;
1176         case GDK_Right:
1177         case GDK_KP_Right:
1178             if (!MOD__CTRL_ONLY) {
1179                 dc->width += 0.01;
1180                 if (dc->width > 1.0)
1181                     dc->width = 1.0;
1182                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
1183                 sp_ddc_update_cursors(dc);
1184                 ret = TRUE;
1185             }
1186             break;
1187         case GDK_Left:
1188         case GDK_KP_Left:
1189             if (!MOD__CTRL_ONLY) {
1190                 dc->width -= 0.01;
1191                 if (dc->width < 0.01)
1192                     dc->width = 0.01;
1193                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1194                 sp_ddc_update_cursors(dc);
1195                 ret = TRUE;
1196             }
1197             break;
1198         case GDK_Home:
1199         case GDK_KP_Home:
1200             dc->width = 0.01;
1201             sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1202             sp_ddc_update_cursors(dc);
1203             ret = TRUE;
1204             break;
1205         case GDK_End:
1206         case GDK_KP_End:
1207             dc->width = 1.0;
1208             sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
1209             sp_ddc_update_cursors(dc);
1210             ret = TRUE;
1211             break;
1212         case GDK_x:
1213         case GDK_X:
1214             if (MOD__ALT_ONLY) {
1215                 desktop->setToolboxFocusTo ("altx-calligraphy");
1216                 ret = TRUE;
1217             }
1218             break;
1219         case GDK_Escape:
1220             if (dc->is_drawing) {
1221                 // if drawing, cancel, otherwise pass it up for deselecting
1222                 calligraphic_cancel (dc);
1223                 ret = TRUE;
1224             }
1225             break;
1226         case GDK_z:
1227         case GDK_Z:
1228             if (MOD__CTRL_ONLY && dc->is_drawing) {
1229                 // if drawing, cancel, otherwise pass it up for undo
1230                 calligraphic_cancel (dc);
1231                 ret = TRUE;
1232             }
1233             break;
1234         case GDK_Meta_L:
1235         case GDK_Meta_R:
1236             event_context->cursor_shape = cursor_thicken_xpm;
1237             sp_event_context_update_cursor(event_context);
1238             break;
1239         case GDK_Alt_L:
1240         case GDK_Alt_R:
1241             if (MOD__SHIFT) {
1242                 event_context->cursor_shape = cursor_thicken_xpm;
1243                 sp_event_context_update_cursor(event_context);
1244             } else {
1245                 event_context->cursor_shape = cursor_thin_xpm;
1246                 sp_event_context_update_cursor(event_context);
1247             }
1248             break;
1249         case GDK_Shift_L:
1250         case GDK_Shift_R:
1251             if (MOD__ALT) {
1252                 event_context->cursor_shape = cursor_thicken_xpm;
1253                 sp_event_context_update_cursor(event_context);
1254             }
1255             break;
1256         default:
1257             break;
1258         }
1259         break;
1260
1261     case GDK_KEY_RELEASE:
1262         switch (get_group0_keyval(&event->key)) {
1263             case GDK_Control_L:
1264             case GDK_Control_R:
1265                 dc->_message_context->clear();
1266                 dc->hatch_spacing = 0;
1267                 dc->hatch_spacing_step = 0;
1268                 break;
1269             case GDK_Alt_L:
1270             case GDK_Alt_R:
1271                 event_context->cursor_shape = cursor_calligraphy_xpm;
1272                 sp_event_context_update_cursor(event_context);
1273                 break;
1274             case GDK_Shift_L:
1275             case GDK_Shift_R:
1276                 if (MOD__ALT) {
1277                     event_context->cursor_shape = cursor_thin_xpm;
1278                     sp_event_context_update_cursor(event_context);
1279                 }
1280                 break;
1281             case GDK_Meta_L:
1282             case GDK_Meta_R:
1283                 event_context->cursor_shape = cursor_calligraphy_xpm;
1284                 sp_event_context_update_cursor(event_context);
1285             break;
1286             default:
1287                 break;
1288         }
1289
1290     default:
1291         break;
1292     }
1293
1294     if (!ret) {
1295         if (((SPEventContextClass *) parent_class)->root_handler) {
1296             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
1297         }
1298     }
1299
1300     return ret;
1301 }
1302
1303
1304 static void
1305 clear_current(SPDynaDrawContext *dc)
1306 {
1307     /* reset bpath */
1308     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
1309     /* reset curve */
1310     sp_curve_reset(dc->currentcurve);
1311     sp_curve_reset(dc->cal1);
1312     sp_curve_reset(dc->cal2);
1313     /* reset points */
1314     dc->npoints = 0;
1315 }
1316
1317 static void
1318 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
1319 {
1320     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1321
1322     if (!sp_curve_empty(dc->accumulated)) {
1323         NArtBpath *abp;
1324         gchar *str;
1325
1326         if (!dc->repr) {
1327             /* Create object */
1328             Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
1329             Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1330
1331             /* Set style */
1332             sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
1333
1334             dc->repr = repr;
1335
1336             SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
1337             Inkscape::GC::release(dc->repr);
1338             item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
1339             item->updateRepr();
1340         }
1341         abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
1342         str = sp_svg_write_path(abp);
1343         g_assert( str != NULL );
1344         g_free(abp);
1345         dc->repr->setAttribute("d", str);
1346         g_free(str);
1347
1348         if (unionize) {
1349             sp_desktop_selection(desktop)->add(dc->repr);
1350             sp_selected_path_union_skip_undo();
1351         } else {
1352             if (dc->keep_selected) {
1353                 sp_desktop_selection(desktop)->set(dc->repr);
1354             }
1355         }
1356
1357     } else {
1358         if (dc->repr) {
1359             sp_repr_unparent(dc->repr);
1360         }
1361         dc->repr = NULL;
1362     }
1363
1364     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1365                      _("Draw calligraphic stroke"));
1366 }
1367
1368 static void
1369 add_cap(SPCurve *curve,
1370         NR::Point const &pre, NR::Point const &from,
1371         NR::Point const &to, NR::Point const &post,
1372         double rounding)
1373 {
1374     NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1375     double mag = NR::L2(vel);
1376
1377     NR::Point v_in = from - pre;
1378     double mag_in = NR::L2(v_in);
1379     if ( mag_in > DYNA_EPSILON ) {
1380         v_in = mag * v_in / mag_in;
1381     } else {
1382         v_in = NR::Point(0, 0);
1383     }
1384
1385     NR::Point v_out = to - post;
1386     double mag_out = NR::L2(v_out);
1387     if ( mag_out > DYNA_EPSILON ) {
1388         v_out = mag * v_out / mag_out;
1389     } else {
1390         v_out = NR::Point(0, 0);
1391     }
1392
1393     if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
1394         sp_curve_curveto(curve, from + v_in, to + v_out, to);
1395     }
1396 }
1397
1398 static void
1399 accumulate_calligraphic(SPDynaDrawContext *dc)
1400 {
1401     if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
1402         sp_curve_reset(dc->accumulated); /*  Is this required ?? */
1403         SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
1404
1405         g_assert(dc->cal1->end > 1);
1406         g_assert(rev_cal2->end > 1);
1407         g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
1408         g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
1409         g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
1410         g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
1411         g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
1412         g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
1413
1414         sp_curve_append(dc->accumulated, dc->cal1, FALSE);
1415
1416         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);
1417
1418         sp_curve_append(dc->accumulated, rev_cal2, TRUE);
1419
1420         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);
1421
1422         sp_curve_closepath(dc->accumulated);
1423
1424         sp_curve_unref(rev_cal2);
1425
1426         sp_curve_reset(dc->cal1);
1427         sp_curve_reset(dc->cal2);
1428     }
1429 }
1430
1431 static double square(double const x)
1432 {
1433     return x * x;
1434 }
1435
1436 static void
1437 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1438 {
1439     double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
1440
1441 #ifdef DYNA_DRAW_VERBOSE
1442     g_print("[F&S:R=%c]", release?'T':'F');
1443 #endif
1444
1445     if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1446         return; // just clicked
1447
1448     if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1449 #define BEZIER_SIZE       4
1450 #define BEZIER_MAX_BEZIERS  8
1451 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1452
1453 #ifdef DYNA_DRAW_VERBOSE
1454         g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1455                 dc->npoints, release ? "TRUE" : "FALSE");
1456 #endif
1457
1458         /* Current calligraphic */
1459         if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
1460             /* dc->npoints > 0 */
1461             /* g_print("calligraphics(1|2) reset\n"); */
1462             sp_curve_reset(dc->cal1);
1463             sp_curve_reset(dc->cal2);
1464
1465             sp_curve_moveto(dc->cal1, dc->point1[0]);
1466             sp_curve_moveto(dc->cal2, dc->point2[0]);
1467         }
1468
1469         NR::Point b1[BEZIER_MAX_LENGTH];
1470         gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1471                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1472         g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1473
1474         NR::Point b2[BEZIER_MAX_LENGTH];
1475         gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1476                                                tolerance_sq, BEZIER_MAX_BEZIERS);
1477         g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1478
1479         if ( nb1 != -1 && nb2 != -1 ) {
1480             /* Fit and draw and reset state */
1481 #ifdef DYNA_DRAW_VERBOSE
1482             g_print("nb1:%d nb2:%d\n", nb1, nb2);
1483 #endif
1484             /* CanvasShape */
1485             if (! release) {
1486                 sp_curve_reset(dc->currentcurve);
1487                 sp_curve_moveto(dc->currentcurve, b1[0]);
1488                 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1489                     sp_curve_curveto(dc->currentcurve, bp1[1],
1490                                      bp1[2], bp1[3]);
1491                 }
1492                 sp_curve_lineto(dc->currentcurve,
1493                                 b2[BEZIER_SIZE*(nb2-1) + 3]);
1494                 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1495                     sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1496                 }
1497                 // FIXME: dc->segments is always NULL at this point??
1498                 if (!dc->segments) { // first segment
1499                     add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1500                 }
1501                 sp_curve_closepath(dc->currentcurve);
1502                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1503             }
1504
1505             /* Current calligraphic */
1506             for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1507                 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1508             }
1509             for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1510                 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1511             }
1512         } else {
1513             /* fixme: ??? */
1514 #ifdef DYNA_DRAW_VERBOSE
1515             g_print("[fit_and_split] failed to fit-cubic.\n");
1516 #endif
1517             draw_temporary_box(dc);
1518
1519             for (gint i = 1; i < dc->npoints; i++) {
1520                 sp_curve_lineto(dc->cal1, dc->point1[i]);
1521             }
1522             for (gint i = 1; i < dc->npoints; i++) {
1523                 sp_curve_lineto(dc->cal2, dc->point2[i]);
1524             }
1525         }
1526
1527         /* Fit and draw and copy last point */
1528 #ifdef DYNA_DRAW_VERBOSE
1529         g_print("[%d]Yup\n", dc->npoints);
1530 #endif
1531         if (!release) {
1532             g_assert(!sp_curve_empty(dc->currentcurve));
1533
1534             SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1535                                                    SP_TYPE_CANVAS_BPATH,
1536                                                    NULL);
1537             SPCurve *curve = sp_curve_copy(dc->currentcurve);
1538             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1539             sp_curve_unref(curve);
1540
1541             guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1542             //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1543             double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
1544             double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1545             //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1546             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1547             //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1548             //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);
1549             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1550             /* fixme: Cannot we cascade it to root more clearly? */
1551             g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1552
1553             dc->segments = g_slist_prepend(dc->segments, cbp);
1554         }
1555
1556         dc->point1[0] = dc->point1[dc->npoints - 1];
1557         dc->point2[0] = dc->point2[dc->npoints - 1];
1558         dc->npoints = 1;
1559     } else {
1560         draw_temporary_box(dc);
1561     }
1562 }
1563
1564 static void
1565 draw_temporary_box(SPDynaDrawContext *dc)
1566 {
1567     sp_curve_reset(dc->currentcurve);
1568
1569     sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1570     for (gint i = dc->npoints-2; i >= 0; i--) {
1571         sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1572     }
1573     for (gint i = 0; i < dc->npoints; i++) {
1574         sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1575     }
1576     if (dc->npoints >= 2) {
1577         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);
1578     }
1579
1580     sp_curve_closepath(dc->currentcurve);
1581     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1582 }
1583
1584 /*
1585   Local Variables:
1586   mode:c++
1587   c-file-style:"stroustrup"
1588   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1589   indent-tabs-mode:nil
1590   fill-column:99
1591   End:
1592 */
1593 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :