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  *
  11  * The original dynadraw code:
  12  *   Paul Haeberli <paul@sgi.com>
  13  *
  14  * Copyright (C) 1998 The Free Software Foundation
  15  * Copyright (C) 1999-2005 authors
  16  * Copyright (C) 2001-2002 Ximian, Inc.
  17  *
  18  * Released under GNU GPL, read the file 'COPYING' for more information
  19  */
  20
  21 #define noDYNA_DRAW_VERBOSE
  22
  23 #include "config.h"
  24
  25 #include <gtk/gtk.h>
  26 #include <gdk/gdkkeysyms.h>
  27
  28 #include "svg/svg.h"
  29 #include "display/canvas-bpath.h"
  30 #include "display/bezier-utils.h"
  31
  32 #include <glib/gmem.h>
  33 #include "macros.h"
  34 #include "document.h"
  35 #include "selection.h"
  36 #include "desktop.h"
  37 #include "desktop-events.h"
  38 #include "desktop-handles.h"
  39 #include "desktop-affine.h"
  40 #include "desktop-style.h"
  41 #include "message-context.h"
  42 #include "pixmaps/cursor-calligraphy.xpm"
  43 #include "pixmaps/cursor-calligraphy.pixbuf"
  44 #include "dyna-draw-context.h"
  45 #include "libnr/n-art-bpath.h"
  46 #include "libnr/nr-path.h"
  47 #include "xml/repr.h"
  48 #include "context-fns.h"
  49 #include "sp-item.h"
  50 #include "inkscape.h"
  51 #include "color.h"
  52
  53 #define DDC_RED_RGBA 0xff0000ff
  54
  55 #define SAMPLE_TIMEOUT 10
  56 #define TOLERANCE_LINE 1.0
  57 #define TOLERANCE_CALLIGRAPHIC 3.0
  58 #define DYNA_EPSILON 1.0e-6
  59
  60 #define DYNA_MIN_WIDTH 1.0e-6
  61
  62 #define DRAG_MIN 0.0
  63 #define DRAG_DEFAULT 1.0
  64 #define DRAG_MAX 1.0
  65
  66 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
  67 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
  68 static void sp_dyna_draw_context_dispose(GObject *object);
  69
  70 static void sp_dyna_draw_context_setup(SPEventContext *ec);
  71 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
  72 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
  73
  74 static void clear_current(SPDynaDrawContext *dc);
  75 static void set_to_accumulated(SPDynaDrawContext *dc);
  76 static void accumulate_calligraphic(SPDynaDrawContext *dc);
  77
  78 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
  79 static void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release);
  80
  81 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
  82 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
  83 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
  84 static void draw_temporary_box(SPDynaDrawContext *dc);
  85
  86
  87 static SPEventContextClass *parent_class;
  88
  89 GtkType
  90 sp_dyna_draw_context_get_type(void)
  91 {
  92     static GType type = 0;
  93     if (!type) {
  94         GTypeInfo info = {
  95             sizeof(SPDynaDrawContextClass),
  96             NULL, NULL,
  97             (GClassInitFunc) sp_dyna_draw_context_class_init,
  98             NULL, NULL,
  99             sizeof(SPDynaDrawContext),
 100             4,
 101             (GInstanceInitFunc) sp_dyna_draw_context_init,
 102             NULL,   /* value_table */
 103         };
 104         type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
 105     }
 106     return type;
 107 }
 108
 109 static void
 110 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
 111 {
 112     GObjectClass *object_class = (GObjectClass *) klass;
 113     SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
 114
 115     parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
 116
 117     object_class->dispose = sp_dyna_draw_context_dispose;
 118
 119     event_context_class->setup = sp_dyna_draw_context_setup;
 120     event_context_class->set = sp_dyna_draw_context_set;
 121     event_context_class->root_handler = sp_dyna_draw_context_root_handler;
 122 }
 123
 124 static void
 125 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
 126 {
 127     SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
 128
 129     event_context->cursor_shape = cursor_calligraphy_xpm;
 130     event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
 131             -1,
 132             cursor_calligraphy_pixbuf,
 133             FALSE,
 134             NULL);
 135     event_context->hot_x = 4;
 136     event_context->hot_y = 4;
 137
 138     ddc->accumulated = NULL;
 139     ddc->segments = NULL;
 140     ddc->currentcurve = NULL;
 141     ddc->currentshape = NULL;
 142     ddc->npoints = 0;
 143     ddc->cal1 = NULL;
 144     ddc->cal2 = NULL;
 145     ddc->repr = NULL;
 146
 147     /* DynaDraw values */
 148     ddc->cur = NR::Point(0,0);
 149     ddc->last = NR::Point(0,0);
 150     ddc->vel = NR::Point(0,0);
 151     ddc->acc = NR::Point(0,0);
 152     ddc->ang = NR::Point(0,0);
 153     ddc->del = NR::Point(0,0);
 154
 155     /* attributes */
 156     ddc->dragging = FALSE;
 157
 158     ddc->mass = 0.3;
 159     ddc->drag = DRAG_DEFAULT;
 160     ddc->angle = 30.0;
 161     ddc->width = 0.2;
 162
 163     ddc->vel_thin = 0.1;
 164     ddc->flatness = 0.9;
 165
 166     ddc->abs_width = false;
 167     ddc->keep_selected = true;
 168 }
 169
 170 static void
 171 sp_dyna_draw_context_dispose(GObject *object)
 172 {
 173     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
 174
 175     if (ddc->accumulated) {
 176         ddc->accumulated = sp_curve_unref(ddc->accumulated);
 177     }
 178
 179     while (ddc->segments) {
 180         gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
 181         ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
 182     }
 183
 184     if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
 185     if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
 186     if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
 187
 188     if (ddc->currentshape) {
 189         gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
 190         ddc->currentshape = NULL;
 191     }
 192
 193     if (ddc->_message_context) {
 194         delete ddc->_message_context;
 195     }
 196
 197     G_OBJECT_CLASS(parent_class)->dispose(object);
 198 }
 199
 200 static void
 201 sp_dyna_draw_context_setup(SPEventContext *ec)
 202 {
 203     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 204
 205     if (((SPEventContextClass *) parent_class)->setup)
 206         ((SPEventContextClass *) parent_class)->setup(ec);
 207
 208     ddc->accumulated = sp_curve_new_sized(32);
 209     ddc->currentcurve = sp_curve_new_sized(4);
 210
 211     ddc->cal1 = sp_curve_new_sized(32);
 212     ddc->cal2 = sp_curve_new_sized(32);
 213
 214     ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
 215     sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
 216     sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 217     /* fixme: Cannot we cascade it to root more clearly? */
 218     g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
 219
 220     sp_event_context_read(ec, "mass");
 221     sp_event_context_read(ec, "drag");
 222     sp_event_context_read(ec, "angle");
 223     sp_event_context_read(ec, "width");
 224     sp_event_context_read(ec, "thinning");
 225     sp_event_context_read(ec, "tremor");
 226     sp_event_context_read(ec, "flatness");
 227     sp_event_context_read(ec, "usepressure");
 228     sp_event_context_read(ec, "usetilt");
 229     sp_event_context_read(ec, "abs_width");
 230     sp_event_context_read(ec, "keep_selected");
 231
 232     ddc->is_drawing = false;
 233
 234     ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
 235 }
 236
 237 static void
 238 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
 239 {
 240     SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
 241
 242     if (!strcmp(key, "mass")) {
 243         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
 244         ddc->mass = CLAMP(dval, -1000.0, 1000.0);
 245     } else if (!strcmp(key, "drag")) {
 246         double const dval = ( val ? g_ascii_strtod (val, NULL) : DRAG_DEFAULT );
 247         ddc->drag = CLAMP(dval, DRAG_MIN, DRAG_MAX);
 248     } else if (!strcmp(key, "angle")) {
 249         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
 250         ddc->angle = CLAMP (dval, -90, 90);
 251     } else if (!strcmp(key, "width")) {
 252         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 253         ddc->width = CLAMP(dval, -1000.0, 1000.0);
 254     } else if (!strcmp(key, "thinning")) {
 255         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
 256         ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
 257     } else if (!strcmp(key, "tremor")) {
 258         double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
 259         ddc->tremor = CLAMP(dval, 0.0, 1.0);
 260     } else if (!strcmp(key, "flatness")) {
 261         double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
 262         ddc->flatness = CLAMP(dval, 0, 1.0);
 263     } else if (!strcmp(key, "usepressure")) {
 264         ddc->usepressure = (val && strcmp(val, "0"));
 265     } else if (!strcmp(key, "usetilt")) {
 266         ddc->usetilt = (val && strcmp(val, "0"));
 267     } else if (!strcmp(key, "abs_width")) {
 268         ddc->abs_width = (val && strcmp(val, "0"));
 269     } else if (!strcmp(key, "keep_selected")) {
 270         ddc->keep_selected = (val && strcmp(val, "0"));
 271     }
 272
 273     //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
 274 }
 275
 276 static double
 277 flerp(double f0, double f1, double p)
 278 {
 279     return f0 + ( f1 - f0 ) * p;
 280 }
 281
 282 /* Get normalized point */
 283 static NR::Point
 284 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
 285 {
 286     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 287     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 288     return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max,  ( v[NR::Y] - drect.min()[NR::Y] ) / max);
 289 }
 290
 291 /* Get view point */
 292 static NR::Point
 293 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
 294 {
 295     NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
 296     double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
 297     return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
 298 }
 299
 300 static void
 301 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
 302 {
 303     dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
 304     dc->vel = NR::Point(0,0);
 305     dc->acc = NR::Point(0,0);
 306     dc->ang = NR::Point(0,0);
 307     dc->del = NR::Point(0,0);
 308 }
 309
 310 static void
 311 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
 312 {
 313     if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
 314         dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
 315     else
 316         dc->pressure = DDC_DEFAULT_PRESSURE;
 317
 318     if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
 319         dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
 320     else
 321         dc->xtilt = DDC_DEFAULT_TILT;
 322
 323     if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
 324         dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
 325     else
 326         dc->ytilt = DDC_DEFAULT_TILT;
 327 }
 328
 329
 330 static gboolean
 331 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
 332 {
 333     NR::Point n = sp_dyna_draw_get_npoint(dc, p);
 334
 335     /* Calculate mass and drag */
 336     double const mass = flerp(1.0, 160.0, dc->mass);
 337     double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
 338
 339     /* Calculate force and acceleration */
 340     NR::Point force = n - dc->cur;
 341     if ( NR::L2(force) < DYNA_EPSILON ) {
 342         return FALSE;
 343     }
 344
 345     dc->acc = force / mass;
 346
 347     /* Calculate new velocity */
 348     dc->vel += dc->acc;
 349
 350     /* Calculate angle of drawing tool */
 351
 352     double a1;
 353     if (dc->usetilt) {
 354         // 1a. calculate nib angle from input device tilt:
 355         gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
 356
 357         if (length > 0) {
 358             NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
 359             a1 = atan2(ang1);
 360         }
 361         else
 362             a1 = 0.0;
 363     }
 364     else {
 365         // 1b. fixed dc->angle (absolutely flat nib):
 366         double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
 367         NR::Point ang1 = NR::Point(-sin(radians),  cos(radians));
 368         a1 = atan2(ang1);
 369     }
 370
 371     // 2. perpendicular to dc->vel (absolutely non-flat nib):
 372     gdouble const mag_vel = NR::L2(dc->vel);
 373     if ( mag_vel < DYNA_EPSILON ) {
 374         return FALSE;
 375     }
 376     NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
 377
 378     // 3. Average them using flatness parameter:
 379     // calculate angles
 380     double a2 = atan2(ang2);
 381     // flip a2 to force it to be in the same half-circle as a1
 382     bool flipped = false;
 383     if (fabs (a2-a1) > 0.5*M_PI) {
 384         a2 += M_PI;
 385         flipped = true;
 386     }
 387     // normalize a2
 388     if (a2 > M_PI)
 389         a2 -= 2*M_PI;
 390     if (a2 < -M_PI)
 391         a2 += 2*M_PI;
 392     // find the flatness-weighted bisector angle, unflip if a2 was flipped
 393     // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
 394     double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
 395     // convert to point
 396     dc->ang = NR::Point (cos (new_ang), sin (new_ang));
 397
 398     /* Apply drag */
 399     dc->vel *= 1.0 - drag;
 400
 401     /* Update position */
 402     dc->last = dc->cur;
 403     dc->cur += dc->vel;
 404
 405     return TRUE;
 406 }
 407
 408 static void
 409 sp_dyna_draw_brush(SPDynaDrawContext *dc)
 410 {
 411     g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
 412
 413     // How much velocity thins strokestyle
 414     double vel_thin = flerp (0, 160, dc->vel_thin);
 415
 416     // Influence of pressure on thickness
 417     double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
 418
 419     double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
 420
 421     double tremble_left = 0, tremble_right = 0;
 422     if (dc->tremor > 0) {
 423         // obtain two normally distributed random variables, using polar Box-Muller transform
 424         double x1, x2, w, y1, y2;
 425         do {
 426             x1 = 2.0 * g_random_double_range(0,1) - 1.0;
 427             x2 = 2.0 * g_random_double_range(0,1) - 1.0;
 428             w = x1 * x1 + x2 * x2;
 429         } while ( w >= 1.0 );
 430         w = sqrt( (-2.0 * log( w ) ) / w );
 431         y1 = x1 * w;
 432         y2 = x2 * w;
 433
 434         // deflect both left and right edges randomly and independently, so that:
 435         // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
 436         // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
 437         // (3) deflection somewhat depends on speed, to prevent fast strokes looking
 438         // comparatively smooth and slow ones excessively jittery
 439         tremble_left  = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 440         tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
 441     }
 442
 443     if ( width < 0.02 * dc->width ) {
 444         width = 0.02 * dc->width;
 445     }
 446
 447     double dezoomify_factor = 0.05 * 1000;
 448     if (!dc->abs_width) {
 449         dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
 450     }
 451
 452     NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
 453     NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
 454
 455     NR::Point abs_middle = sp_dyna_draw_get_vpoint(dc, dc->cur);
 456
 457     dc->point1[dc->npoints] = abs_middle + del_left;
 458     dc->point2[dc->npoints] = abs_middle - del_right;
 459
 460     dc->del = 0.5*(del_left + del_right);
 461
 462     dc->npoints++;
 463 }
 464
 465 void
 466 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
 467 {
 468     desktop->setToolboxAdjustmentValue (id, value);
 469 }
 470
 471 gint
 472 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
 473                                   GdkEvent *event)
 474 {
 475     SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
 476     SPDesktop *desktop = event_context->desktop;
 477
 478     gint ret = FALSE;
 479
 480     switch (event->type) {
 481     case GDK_BUTTON_PRESS:
 482         if ( event->button.button == 1 ) {
 483
 484             SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
 485
 486             if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
 487                 return TRUE;
 488             }
 489
 490             NR::Point const button_w(event->button.x,
 491                                      event->button.y);
 492             NR::Point const button_dt(desktop->w2d(button_w));
 493             sp_dyna_draw_reset(dc, button_dt);
 494             sp_dyna_draw_extinput(dc, event);
 495             sp_dyna_draw_apply(dc, button_dt);
 496             sp_curve_reset(dc->accumulated);
 497             if (dc->repr) {
 498                 dc->repr = NULL;
 499             }
 500
 501             /* initialize first point */
 502             dc->npoints = 0;
 503
 504             sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
 505                                 ( GDK_KEY_PRESS_MASK |
 506                                   GDK_BUTTON_RELEASE_MASK |
 507                                   GDK_POINTER_MOTION_MASK |
 508                                   GDK_BUTTON_PRESS_MASK ),
 509                                 NULL,
 510                                 event->button.time);
 511
 512             ret = TRUE;
 513
 514             dc->is_drawing = true;
 515         }
 516         break;
 517     case GDK_MOTION_NOTIFY:
 518         if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
 519             dc->dragging = TRUE;
 520
 521             NR::Point const motion_w(event->motion.x,
 522                                      event->motion.y);
 523             NR::Point const motion_dt(desktop->w2d(motion_w));
 524
 525             sp_dyna_draw_extinput(dc, event);
 526             if (!sp_dyna_draw_apply(dc, motion_dt)) {
 527                 ret = TRUE;
 528                 break;
 529             }
 530
 531             if ( dc->cur != dc->last ) {
 532                 sp_dyna_draw_brush(dc);
 533                 g_assert( dc->npoints > 0 );
 534                 fit_and_split(dc, FALSE);
 535             }
 536             ret = TRUE;
 537         }
 538         break;
 539
 540     case GDK_BUTTON_RELEASE:
 541         sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
 542         dc->is_drawing = false;
 543         if ( dc->dragging && event->button.button == 1 ) {
 544             dc->dragging = FALSE;
 545
 546             /* Remove all temporary line segments */
 547             while (dc->segments) {
 548                 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
 549                 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
 550             }
 551             /* Create object */
 552             fit_and_split(dc, TRUE);
 553             accumulate_calligraphic(dc);
 554             set_to_accumulated(dc); /* temporal implementation */
 555             /* reset accumulated curve */
 556             sp_curve_reset(dc->accumulated);
 557             clear_current(dc);
 558             if (dc->repr) {
 559                 dc->repr = NULL;
 560             }
 561             ret = TRUE;
 562         }
 563         break;
 564     case GDK_KEY_PRESS:
 565         switch (get_group0_keyval (&event->key)) {
 566         case GDK_Up:
 567         case GDK_KP_Up:
 568             if (!MOD__CTRL_ONLY) {
 569                 dc->angle += 5.0;
 570                 if (dc->angle > 90.0)
 571                     dc->angle = 90.0;
 572                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
 573                 ret = TRUE;
 574             }
 575             break;
 576         case GDK_Down:
 577         case GDK_KP_Down:
 578             if (!MOD__CTRL_ONLY) {
 579                 dc->angle -= 5.0;
 580                 if (dc->angle < -90.0)
 581                     dc->angle = -90.0;
 582                 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
 583                 ret = TRUE;
 584             }
 585             break;
 586         case GDK_Right:
 587         case GDK_KP_Right:
 588             if (!MOD__CTRL_ONLY) {
 589                 dc->width += 0.01;
 590                 if (dc->width > 1.0)
 591                     dc->width = 1.0;
 592                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
 593                 ret = TRUE;
 594             }
 595             break;
 596         case GDK_Left:
 597         case GDK_KP_Left:
 598             if (!MOD__CTRL_ONLY) {
 599                 dc->width -= 0.01;
 600                 if (dc->width < 0.01)
 601                     dc->width = 0.01;
 602                 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
 603                 ret = TRUE;
 604             }
 605             break;
 606         case GDK_x:
 607         case GDK_X:
 608             if (MOD__ALT_ONLY) {
 609                 desktop->setToolboxFocusTo ("altx-calligraphy");
 610                 ret = TRUE;
 611             }
 612             break;
 613         case GDK_Escape:
 614             sp_desktop_selection(desktop)->clear();
 615             break;
 616
 617         default:
 618             break;
 619         }
 620     default:
 621         break;
 622     }
 623
 624     if (!ret) {
 625         if (((SPEventContextClass *) parent_class)->root_handler) {
 626             ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
 627         }
 628     }
 629
 630     return ret;
 631 }
 632
 633
 634 static void
 635 clear_current(SPDynaDrawContext *dc)
 636 {
 637     /* reset bpath */
 638     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
 639     /* reset curve */
 640     sp_curve_reset(dc->currentcurve);
 641     sp_curve_reset(dc->cal1);
 642     sp_curve_reset(dc->cal2);
 643     /* reset points */
 644     dc->npoints = 0;
 645 }
 646
 647 static void
 648 set_to_accumulated(SPDynaDrawContext *dc)
 649 {
 650     SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
 651
 652     if (!sp_curve_empty(dc->accumulated)) {
 653         NArtBpath *abp;
 654         gchar *str;
 655
 656         if (!dc->repr) {
 657             /* Create object */
 658             Inkscape::XML::Node *repr = sp_repr_new("svg:path");
 659
 660             /* Set style */
 661             sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
 662
 663             dc->repr = repr;
 664
 665             SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
 666             Inkscape::GC::release(dc->repr);
 667             item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
 668             item->updateRepr();
 669             if (dc->keep_selected) {
 670                 sp_desktop_selection(desktop)->set(dc->repr);
 671             } else {
 672                 sp_desktop_selection(desktop)->clear();
 673             }
 674         }
 675         abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
 676         str = sp_svg_write_path(abp);
 677         g_assert( str != NULL );
 678         g_free(abp);
 679         dc->repr->setAttribute("d", str);
 680         g_free(str);
 681     } else {
 682         if (dc->repr) {
 683             sp_repr_unparent(dc->repr);
 684         }
 685         dc->repr = NULL;
 686     }
 687
 688     sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
 689                      /* TODO: annotate */ "dyna-draw-context.cpp:689");
 690 }
 691
 692 static void
 693 accumulate_calligraphic(SPDynaDrawContext *dc)
 694 {
 695     if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
 696         sp_curve_reset(dc->accumulated); /*  Is this required ?? */
 697         SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
 698         sp_curve_append(dc->accumulated, dc->cal1, FALSE);
 699         sp_curve_append(dc->accumulated, rev_cal2, TRUE);
 700         sp_curve_closepath(dc->accumulated);
 701
 702         sp_curve_unref(rev_cal2);
 703
 704         sp_curve_reset(dc->cal1);
 705         sp_curve_reset(dc->cal2);
 706     }
 707 }
 708
 709 static void
 710 fit_and_split(SPDynaDrawContext *dc,
 711               gboolean release)
 712 {
 713     fit_and_split_calligraphics(dc, release);
 714 }
 715
 716 static double square(double const x)
 717 {
 718     return x * x;
 719 }
 720
 721 static void
 722 fit_and_split_calligraphics(SPDynaDrawContext *dc, gboolean release)
 723 {
 724     double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
 725
 726 #ifdef DYNA_DRAW_VERBOSE
 727     g_print("[F&S:R=%c]", release?'T':'F');
 728 #endif
 729
 730     if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
 731         return; // just clicked
 732
 733     if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
 734 #define BEZIER_SIZE       4
 735 #define BEZIER_MAX_BEZIERS  8
 736 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
 737
 738 #ifdef DYNA_DRAW_VERBOSE
 739         g_print("[F&S:#] dc->npoints:%d, release:%s\n",
 740                 dc->npoints, release ? "TRUE" : "FALSE");
 741 #endif
 742
 743         /* Current calligraphic */
 744         if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
 745             /* dc->npoints > 0 */
 746             /* g_print("calligraphics(1|2) reset\n"); */
 747             sp_curve_reset(dc->cal1);
 748             sp_curve_reset(dc->cal2);
 749
 750             sp_curve_moveto(dc->cal1, dc->point1[0]);
 751             sp_curve_moveto(dc->cal2, dc->point2[0]);
 752         }
 753
 754         NR::Point b1[BEZIER_MAX_LENGTH];
 755         gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
 756                                                tolerance_sq, BEZIER_MAX_BEZIERS);
 757         g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
 758
 759         NR::Point b2[BEZIER_MAX_LENGTH];
 760         gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
 761                                                tolerance_sq, BEZIER_MAX_BEZIERS);
 762         g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
 763
 764         if ( nb1 != -1 && nb2 != -1 ) {
 765             /* Fit and draw and reset state */
 766 #ifdef DYNA_DRAW_VERBOSE
 767             g_print("nb1:%d nb2:%d\n", nb1, nb2);
 768 #endif
 769             /* CanvasShape */
 770             if (! release) {
 771                 sp_curve_reset(dc->currentcurve);
 772                 sp_curve_moveto(dc->currentcurve, b1[0]);
 773                 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
 774                     sp_curve_curveto(dc->currentcurve, bp1[1],
 775                                      bp1[2], bp1[3]);
 776                 }
 777                 sp_curve_lineto(dc->currentcurve,
 778                                 b2[BEZIER_SIZE*(nb2-1) + 3]);
 779                 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
 780                     sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
 781                 }
 782                 sp_curve_closepath(dc->currentcurve);
 783                 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
 784             }
 785
 786             /* Current calligraphic */
 787             for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
 788                 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
 789             }
 790             for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
 791                 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
 792             }
 793         } else {
 794             /* fixme: ??? */
 795 #ifdef DYNA_DRAW_VERBOSE
 796             g_print("[fit_and_split_calligraphics] failed to fit-cubic.\n");
 797 #endif
 798             draw_temporary_box(dc);
 799
 800             for (gint i = 1; i < dc->npoints; i++) {
 801                 sp_curve_lineto(dc->cal1, dc->point1[i]);
 802             }
 803             for (gint i = 1; i < dc->npoints; i++) {
 804                 sp_curve_lineto(dc->cal2, dc->point2[i]);
 805             }
 806         }
 807
 808         /* Fit and draw and copy last point */
 809 #ifdef DYNA_DRAW_VERBOSE
 810         g_print("[%d]Yup\n", dc->npoints);
 811 #endif
 812         if (!release) {
 813             g_assert(!sp_curve_empty(dc->currentcurve));
 814
 815             SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
 816                                                    SP_TYPE_CANVAS_BPATH,
 817                                                    NULL);
 818             SPCurve *curve = sp_curve_copy(dc->currentcurve);
 819             sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
 820             sp_curve_unref(curve);
 821
 822             guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
 823             //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
 824             double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
 825             double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
 826             //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
 827             sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
 828             //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
 829             //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);
 830             sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
 831             /* fixme: Cannot we cascade it to root more clearly? */
 832             g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
 833
 834             dc->segments = g_slist_prepend(dc->segments, cbp);
 835         }
 836
 837         dc->point1[0] = dc->point1[dc->npoints - 1];
 838         dc->point2[0] = dc->point2[dc->npoints - 1];
 839         dc->npoints = 1;
 840     } else {
 841         draw_temporary_box(dc);
 842     }
 843 }
 844
 845 static void
 846 draw_temporary_box(SPDynaDrawContext *dc)
 847 {
 848     sp_curve_reset(dc->currentcurve);
 849     sp_curve_moveto(dc->currentcurve, dc->point1[0]);
 850     for (gint i = 1; i < dc->npoints; i++) {
 851         sp_curve_lineto(dc->currentcurve, dc->point1[i]);
 852     }
 853     for (gint i = dc->npoints-1; i >= 0; i--) {
 854         sp_curve_lineto(dc->currentcurve, dc->point2[i]);
 855     }
 856     sp_curve_closepath(dc->currentcurve);
 857     sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
 858 }
 859
 860 /*
 861   Local Variables:
 862   mode:c++
 863   c-file-style:"stroustrup"
 864   c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
 865   indent-tabs-mode:nil
 866   fill-column:99
 867   End:
 868 */
 869 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :