1 #define __SP_DYNA_DRAW_CONTEXT_C__
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 */
24 #define noDYNA_DRAW_VERBOSE
26 #include "config.h"
28 #include <gtk/gtk.h>
29 #include <gdk/gdkkeysyms.h>
30 #include <glibmm/i18n.h>
31 #include <string>
32 #include <cstring>
33 #include <numeric>
35 #include "svg/svg.h"
36 #include "display/canvas-bpath.h"
37 #include "display/bezier-utils.h"
38 #include "display/curve.h"
39 #include <glib/gmem.h>
40 #include "macros.h"
41 #include "document.h"
42 #include "selection.h"
43 #include "desktop.h"
44 #include "desktop-events.h"
45 #include "desktop-handles.h"
46 #include "desktop-affine.h"
47 #include "desktop-style.h"
48 #include "message-context.h"
49 #include "preferences.h"
50 #include "pixmaps/cursor-calligraphy.xpm"
51 #include "libnr/nr-matrix-ops.h"
52 #include "libnr/nr-scale-translate-ops.h"
53 #include "libnr/nr-convert2geom.h"
54 #include "xml/repr.h"
55 #include "context-fns.h"
56 #include "sp-item.h"
57 #include "inkscape.h"
58 #include "color.h"
59 #include "splivarot.h"
60 #include "sp-item-group.h"
61 #include "sp-shape.h"
62 #include "sp-path.h"
63 #include "sp-text.h"
64 #include "display/canvas-bpath.h"
65 #include "display/canvas-arena.h"
66 #include "livarot/Shape.h"
67 #include <2geom/isnan.h>
68 #include <2geom/pathvector.h>
70 #include "dyna-draw-context.h"
72 #define DDC_RED_RGBA 0xff0000ff
74 #define TOLERANCE_CALLIGRAPHIC 0.1
76 #define DYNA_EPSILON 0.5e-6
77 #define DYNA_EPSILON_START 0.5e-2
78 #define DYNA_VEL_START 1e-5
80 #define DYNA_MIN_WIDTH 1.0e-6
82 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
83 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
84 static void sp_dyna_draw_context_dispose(GObject *object);
86 static void sp_dyna_draw_context_setup(SPEventContext *ec);
87 static void sp_dyna_draw_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *value);
88 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
90 static void clear_current(SPDynaDrawContext *dc);
91 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize);
92 static void add_cap(SPCurve *curve, Geom::Point const &from, Geom::Point const &to, double rounding);
93 static bool accumulate_calligraphic(SPDynaDrawContext *dc);
95 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
97 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, Geom::Point p);
98 static Geom::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, Geom::Point v);
99 static Geom::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, Geom::Point n);
100 static void draw_temporary_box(SPDynaDrawContext *dc);
103 static SPEventContextClass *dd_parent_class = 0;
105 GType sp_dyna_draw_context_get_type(void)
106 {
107 static GType type = 0;
108 if (!type) {
109 GTypeInfo info = {
110 sizeof(SPDynaDrawContextClass),
111 0, // base_init
112 0, // base_finalize
113 (GClassInitFunc)sp_dyna_draw_context_class_init,
114 0, // class_finalize
115 0, // class_data
116 sizeof(SPDynaDrawContext),
117 0, // n_preallocs
118 (GInstanceInitFunc)sp_dyna_draw_context_init,
119 0 // value_table
120 };
121 type = g_type_register_static(SP_TYPE_COMMON_CONTEXT, "SPDynaDrawContext", &info, static_cast<GTypeFlags>(0));
122 }
123 return type;
124 }
126 static void
127 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
128 {
129 GObjectClass *object_class = (GObjectClass *) klass;
130 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
132 dd_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
134 object_class->dispose = sp_dyna_draw_context_dispose;
136 event_context_class->setup = sp_dyna_draw_context_setup;
137 event_context_class->set = sp_dyna_draw_context_set;
138 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
139 }
141 static void
142 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
143 {
144 ddc->cursor_shape = cursor_calligraphy_xpm;
145 ddc->hot_x = 4;
146 ddc->hot_y = 4;
148 ddc->vel_thin = 0.1;
149 ddc->flatness = 0.9;
150 ddc->cap_rounding = 0.0;
152 ddc->abs_width = false;
153 ddc->keep_selected = true;
155 ddc->hatch_spacing = 0;
156 ddc->hatch_spacing_step = 0;
157 new (&ddc->hatch_pointer_past) std::list<double>();
158 new (&ddc->hatch_nearest_past) std::list<double>();
159 ddc->hatch_last_nearest = Geom::Point(0,0);
160 ddc->hatch_last_pointer = Geom::Point(0,0);
161 ddc->hatch_vector_accumulated = Geom::Point(0,0);
162 ddc->hatch_escaped = false;
163 ddc->hatch_area = NULL;
164 ddc->hatch_item = NULL;
165 ddc->hatch_livarot_path = NULL;
167 ddc->trace_bg = false;
168 }
170 static void
171 sp_dyna_draw_context_dispose(GObject *object)
172 {
173 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
175 if (ddc->hatch_area) {
176 gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
177 ddc->hatch_area = NULL;
178 }
181 G_OBJECT_CLASS(dd_parent_class)->dispose(object);
183 ddc->hatch_pointer_past.~list();
184 ddc->hatch_nearest_past.~list();
185 }
187 static void
188 sp_dyna_draw_context_setup(SPEventContext *ec)
189 {
190 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
192 if (((SPEventContextClass *) dd_parent_class)->setup)
193 ((SPEventContextClass *) dd_parent_class)->setup(ec);
195 ddc->accumulated = new SPCurve();
196 ddc->currentcurve = new SPCurve();
198 ddc->cal1 = new SPCurve();
199 ddc->cal2 = new SPCurve();
201 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
202 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
203 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
204 /* fixme: Cannot we cascade it to root more clearly? */
205 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
207 {
208 /* TODO: this can be done either with an arcto, and should maybe also be put in a general file (other tools use this as well) */
209 SPCurve *c = new SPCurve();
210 const double C1 = 0.552;
211 c->moveto(-1,0);
212 c->curveto(-1, C1, -C1, 1, 0, 1 );
213 c->curveto(C1, 1, 1, C1, 1, 0 );
214 c->curveto(1, -C1, C1, -1, 0, -1 );
215 c->curveto(-C1, -1, -1, -C1, -1, 0 );
216 c->closepath();
217 ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
218 c->unref();
219 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
220 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
221 sp_canvas_item_hide(ddc->hatch_area);
222 }
224 sp_event_context_read(ec, "mass");
225 sp_event_context_read(ec, "wiggle");
226 sp_event_context_read(ec, "angle");
227 sp_event_context_read(ec, "width");
228 sp_event_context_read(ec, "thinning");
229 sp_event_context_read(ec, "tremor");
230 sp_event_context_read(ec, "flatness");
231 sp_event_context_read(ec, "tracebackground");
232 sp_event_context_read(ec, "usepressure");
233 sp_event_context_read(ec, "usetilt");
234 sp_event_context_read(ec, "abs_width");
235 sp_event_context_read(ec, "keep_selected");
236 sp_event_context_read(ec, "cap_rounding");
238 ddc->is_drawing = false;
239 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
241 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
242 if (prefs->getBool("/tools/calligraphic/selcue")) {
243 ec->enableSelectionCue();
244 }
245 }
247 static void
248 sp_dyna_draw_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
249 {
250 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
251 Glib::ustring path = val->getEntryName();
253 if (path == "tracebackground") {
254 ddc->trace_bg = val->getBool();
255 } else if (path == "keep_selected") {
256 ddc->keep_selected = val->getBool();
257 } else {
258 //pass on up to parent class to handle common attributes.
259 if ( dd_parent_class->set ) {
260 dd_parent_class->set(ec, val);
261 }
262 }
264 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
265 }
267 static double
268 flerp(double f0, double f1, double p)
269 {
270 return f0 + ( f1 - f0 ) * p;
271 }
273 /* Get normalized point */
274 static Geom::Point
275 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, Geom::Point v)
276 {
277 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
278 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
279 return Geom::Point(( v[Geom::X] - drect.min()[Geom::X] ) / max, ( v[Geom::Y] - drect.min()[Geom::Y] ) / max);
280 }
282 /* Get view point */
283 static Geom::Point
284 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, Geom::Point n)
285 {
286 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
287 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
288 return Geom::Point(n[Geom::X] * max + drect.min()[Geom::X], n[Geom::Y] * max + drect.min()[Geom::Y]);
289 }
291 static void
292 sp_dyna_draw_reset(SPDynaDrawContext *dc, Geom::Point p)
293 {
294 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
295 dc->vel = Geom::Point(0,0);
296 dc->vel_max = 0;
297 dc->acc = Geom::Point(0,0);
298 dc->ang = Geom::Point(0,0);
299 dc->del = Geom::Point(0,0);
300 }
302 static void
303 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
304 {
305 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
306 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
307 else
308 dc->pressure = DDC_DEFAULT_PRESSURE;
310 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
311 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
312 else
313 dc->xtilt = DDC_DEFAULT_TILT;
315 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
316 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
317 else
318 dc->ytilt = DDC_DEFAULT_TILT;
319 }
322 static gboolean
323 sp_dyna_draw_apply(SPDynaDrawContext *dc, Geom::Point p)
324 {
325 Geom::Point n = sp_dyna_draw_get_npoint(dc, p);
327 /* Calculate mass and drag */
328 double const mass = flerp(1.0, 160.0, dc->mass);
329 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
331 /* Calculate force and acceleration */
332 Geom::Point force = n - dc->cur;
334 // If force is below the absolute threshold DYNA_EPSILON,
335 // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
336 // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
337 // discard this move.
338 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
339 // especially bothersome at the start of the stroke where we don't yet have the inertia to
340 // smooth them out.
341 if ( Geom::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && Geom::L2(force) < DYNA_EPSILON_START)) {
342 return FALSE;
343 }
345 dc->acc = force / mass;
347 /* Calculate new velocity */
348 dc->vel += dc->acc;
350 if (Geom::L2(dc->vel) > dc->vel_max)
351 dc->vel_max = Geom::L2(dc->vel);
353 /* Calculate angle of drawing tool */
355 double a1;
356 if (dc->usetilt) {
357 // 1a. calculate nib angle from input device tilt:
358 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
360 if (length > 0) {
361 Geom::Point ang1 = Geom::Point(dc->ytilt/length, dc->xtilt/length);
362 a1 = atan2(ang1);
363 }
364 else
365 a1 = 0.0;
366 }
367 else {
368 // 1b. fixed dc->angle (absolutely flat nib):
369 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
370 Geom::Point ang1 = Geom::Point(-sin(radians), cos(radians));
371 a1 = atan2(ang1);
372 }
374 // 2. perpendicular to dc->vel (absolutely non-flat nib):
375 gdouble const mag_vel = Geom::L2(dc->vel);
376 if ( mag_vel < DYNA_EPSILON ) {
377 return FALSE;
378 }
379 Geom::Point ang2 = Geom::rot90(dc->vel) / mag_vel;
381 // 3. Average them using flatness parameter:
382 // calculate angles
383 double a2 = atan2(ang2);
384 // flip a2 to force it to be in the same half-circle as a1
385 bool flipped = false;
386 if (fabs (a2-a1) > 0.5*M_PI) {
387 a2 += M_PI;
388 flipped = true;
389 }
390 // normalize a2
391 if (a2 > M_PI)
392 a2 -= 2*M_PI;
393 if (a2 < -M_PI)
394 a2 += 2*M_PI;
395 // find the flatness-weighted bisector angle, unflip if a2 was flipped
396 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
397 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
399 // Try to detect a sudden flip when the new angle differs too much from the previous for the
400 // current velocity; in that case discard this move
401 double angle_delta = Geom::L2(Geom::Point (cos (new_ang), sin (new_ang)) - dc->ang);
402 if ( angle_delta / Geom::L2(dc->vel) > 4000 ) {
403 return FALSE;
404 }
406 // convert to point
407 dc->ang = Geom::Point (cos (new_ang), sin (new_ang));
409 // 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);
411 /* Apply drag */
412 dc->vel *= 1.0 - drag;
414 /* Update position */
415 dc->last = dc->cur;
416 dc->cur += dc->vel;
418 return TRUE;
419 }
421 static void
422 sp_dyna_draw_brush(SPDynaDrawContext *dc)
423 {
424 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
426 // How much velocity thins strokestyle
427 double vel_thin = flerp (0, 160, dc->vel_thin);
429 // Influence of pressure on thickness
430 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
432 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
433 // drag)
434 Geom::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
435 Geom::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
437 double trace_thick = 1;
438 if (dc->trace_bg) {
439 // pick single pixel
440 NRPixBlock pb;
441 int x = (int) floor(brush_w[Geom::X]);
442 int y = (int) floor(brush_w[Geom::Y]);
443 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
444 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
445 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
446 double R = s[0] / 255.0;
447 double G = s[1] / 255.0;
448 double B = s[2] / 255.0;
449 double A = s[3] / 255.0;
450 double max = MAX (MAX (R, G), B);
451 double min = MIN (MIN (R, G), B);
452 double L = A * (max + min)/2 + (1 - A); // blend with white bg
453 trace_thick = 1 - L;
454 //g_print ("L %g thick %g\n", L, trace_thick);
455 }
457 double width = (pressure_thick * trace_thick - vel_thin * Geom::L2(dc->vel)) * dc->width;
459 double tremble_left = 0, tremble_right = 0;
460 if (dc->tremor > 0) {
461 // obtain two normally distributed random variables, using polar Box-Muller transform
462 double x1, x2, w, y1, y2;
463 do {
464 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
465 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
466 w = x1 * x1 + x2 * x2;
467 } while ( w >= 1.0 );
468 w = sqrt( (-2.0 * log( w ) ) / w );
469 y1 = x1 * w;
470 y2 = x2 * w;
472 // deflect both left and right edges randomly and independently, so that:
473 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
474 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
475 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
476 // comparatively smooth and slow ones excessively jittery
477 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
478 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
479 }
481 if ( width < 0.02 * dc->width ) {
482 width = 0.02 * dc->width;
483 }
485 double dezoomify_factor = 0.05 * 1000;
486 if (!dc->abs_width) {
487 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
488 }
490 Geom::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
491 Geom::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
493 dc->point1[dc->npoints] = brush + del_left;
494 dc->point2[dc->npoints] = brush - del_right;
496 dc->del = 0.5*(del_left + del_right);
498 dc->npoints++;
499 }
501 void
502 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
503 {
504 desktop->setToolboxAdjustmentValue (id, value);
505 }
507 static void
508 calligraphic_cancel(SPDynaDrawContext *dc)
509 {
510 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
511 dc->dragging = FALSE;
512 dc->is_drawing = false;
513 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
514 /* Remove all temporary line segments */
515 while (dc->segments) {
516 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
517 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
518 }
519 /* reset accumulated curve */
520 dc->accumulated->reset();
521 clear_current(dc);
522 if (dc->repr) {
523 dc->repr = NULL;
524 }
525 }
528 gint
529 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
530 GdkEvent *event)
531 {
532 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
533 SPDesktop *desktop = event_context->desktop;
535 gint ret = FALSE;
537 switch (event->type) {
538 case GDK_BUTTON_PRESS:
539 if (event->button.button == 1 && !event_context->space_panning) {
541 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
543 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
544 return TRUE;
545 }
547 Geom::Point const button_w(event->button.x,
548 event->button.y);
549 Geom::Point const button_dt(desktop->w2d(button_w));
550 sp_dyna_draw_reset(dc, button_dt);
551 sp_dyna_draw_extinput(dc, event);
552 sp_dyna_draw_apply(dc, button_dt);
553 dc->accumulated->reset();
554 if (dc->repr) {
555 dc->repr = NULL;
556 }
558 /* initialize first point */
559 dc->npoints = 0;
561 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
562 ( GDK_KEY_PRESS_MASK |
563 GDK_BUTTON_RELEASE_MASK |
564 GDK_POINTER_MOTION_MASK |
565 GDK_BUTTON_PRESS_MASK ),
566 NULL,
567 event->button.time);
569 ret = TRUE;
571 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
572 dc->is_drawing = true;
573 }
574 break;
575 case GDK_MOTION_NOTIFY:
576 {
577 Geom::Point const motion_w(event->motion.x,
578 event->motion.y);
579 Geom::Point motion_dt(desktop->w2d(motion_w));
580 sp_dyna_draw_extinput(dc, event);
582 dc->_message_context->clear();
584 // for hatching:
585 double hatch_dist = 0;
586 Geom::Point hatch_unit_vector(0,0);
587 Geom::Point nearest(0,0);
588 Geom::Point pointer(0,0);
589 Geom::Matrix motion_to_curve(Geom::identity());
591 if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
593 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
594 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
595 // One item selected, and it's a path;
596 // let's try to track it as a guide
598 if (selected != dc->hatch_item) {
599 dc->hatch_item = selected;
600 if (dc->hatch_livarot_path)
601 delete dc->hatch_livarot_path;
602 dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
603 dc->hatch_livarot_path->ConvertWithBackData(0.01);
604 }
606 // calculate pointer point in the guide item's coords
607 motion_to_curve = sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected);
608 pointer = motion_dt * motion_to_curve;
610 // calculate the nearest point on the guide path
611 boost::optional<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
612 nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
615 // distance from pointer to nearest
616 hatch_dist = NR::L2(pointer - nearest);
617 // unit-length vector
618 hatch_unit_vector = (pointer - nearest)/hatch_dist;
620 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
621 } else {
622 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
623 }
624 }
626 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
627 dc->dragging = TRUE;
629 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
631 #define SPEED_ELEMENTS 12
632 #define SPEED_MIN 0.12
633 #define SPEED_NORMAL 0.65
635 // speed is the movement of the nearest point along the guide path, divided by
636 // the movement of the pointer at the same period; it is averaged for the last
637 // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed
638 // is about 1, i.e. the nearest point on the path is moved by about the same
639 // distance as the pointer. If the speed starts to decrease, we are losing
640 // contact with the guide; if it drops below SPEED_MIN, we are on our own and
641 // not attracted to guide anymore. Most often this happens when you have
642 // tracked to the end of a guide calligraphic stroke and keep moving
643 // further. We try to handle this situation gracefully: not stick with the
644 // guide forever but let go of it smoothly and without sharp jerks (non-zero
645 // mass recommended; with zero mass, jerks are still quite noticeable).
647 double speed = 1;
648 if (Geom::L2(dc->hatch_last_nearest) != 0) {
649 // the distance nearest moved since the last motion event
650 double nearest_moved = Geom::L2(nearest - dc->hatch_last_nearest);
651 // the distance pointer moved since the last motion event
652 double pointer_moved = Geom::L2(pointer - dc->hatch_last_pointer);
653 // store them in stacks limited to SPEED_ELEMENTS
654 dc->hatch_nearest_past.push_front(nearest_moved);
655 if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
656 dc->hatch_nearest_past.pop_back();
657 dc->hatch_pointer_past.push_front(pointer_moved);
658 if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
659 dc->hatch_pointer_past.pop_back();
661 // If the stacks are full,
662 if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
663 // calculate the sums of all stored movements
664 double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
665 double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
666 // and divide to get the speed
667 speed = nearest_sum/pointer_sum;
668 //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed);
669 }
670 }
672 if ( dc->hatch_escaped // already escaped, do not reattach
673 || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
674 || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
675 ) {
676 // We are NOT attracted to the guide!
678 //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);
680 // Remember hatch_escaped so we don't get
681 // attracted again until the end of this stroke
682 dc->hatch_escaped = true;
684 } else {
686 // Calculate angle cosine of this vector-to-guide and all past vectors
687 // summed, to detect if we accidentally flipped to the other side of the
688 // guide
689 double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
690 dot /= Geom::L2(pointer - nearest) * Geom::L2(dc->hatch_vector_accumulated);
692 if (dc->hatch_spacing != 0) { // spacing was already set
693 double target;
694 if (speed > SPEED_NORMAL) {
695 // all ok, strictly obey the spacing
696 target = dc->hatch_spacing;
697 } else {
698 // looks like we're starting to lose speed,
699 // so _gradually_ let go attraction to prevent jerks
700 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
701 }
702 if (!IS_NAN(dot) && dot < -0.5) {// flip
703 target = -target;
704 }
706 // This is the track pointer that we will use instead of the real one
707 Geom::Point new_pointer = nearest + target * hatch_unit_vector;
709 // some limited feedback: allow persistent pulling to slightly change
710 // the spacing
711 dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
713 // return it to the desktop coords
714 motion_dt = new_pointer * motion_to_curve.inverse();
716 } else {
717 // this is the first motion event, set the dist
718 dc->hatch_spacing = hatch_dist;
719 }
721 // remember last points
722 dc->hatch_last_pointer = pointer;
723 dc->hatch_last_nearest = nearest;
724 dc->hatch_vector_accumulated += (pointer - nearest);
725 }
727 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
729 } else {
730 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
731 }
733 if (!sp_dyna_draw_apply(dc, motion_dt)) {
734 ret = TRUE;
735 break;
736 }
738 if ( dc->cur != dc->last ) {
739 sp_dyna_draw_brush(dc);
740 g_assert( dc->npoints > 0 );
741 fit_and_split(dc, FALSE);
742 }
743 ret = TRUE;
744 }
746 // Draw the hatching circle if necessary
747 if (event->motion.state & GDK_CONTROL_MASK) {
748 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
749 // Haven't set spacing yet: gray, center free, update radius live
750 Geom::Point c = desktop->w2d(motion_w);
751 NR::Matrix const sm (Geom::Scale(hatch_dist, hatch_dist) * Geom::Translate(c));
752 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
753 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
754 sp_canvas_item_show(dc->hatch_area);
755 } else if (dc->dragging && !dc->hatch_escaped) {
756 // Tracking: green, center snapped, fixed radius
757 Geom::Point c = motion_dt;
758 NR::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
759 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
760 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
761 sp_canvas_item_show(dc->hatch_area);
762 } else if (dc->dragging && dc->hatch_escaped) {
763 // Tracking escaped: red, center free, fixed radius
764 Geom::Point c = desktop->w2d(motion_w);
765 NR::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
767 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
768 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
769 sp_canvas_item_show(dc->hatch_area);
770 } else {
771 // Not drawing but spacing set: gray, center snapped, fixed radius
772 Geom::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
773 if (!IS_NAN(c[Geom::X]) && !IS_NAN(c[Geom::Y])) {
774 NR::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
775 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
776 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
777 sp_canvas_item_show(dc->hatch_area);
778 }
779 }
780 } else {
781 sp_canvas_item_hide(dc->hatch_area);
782 }
783 }
784 break;
787 case GDK_BUTTON_RELEASE:
788 {
789 Geom::Point const motion_w(event->button.x, event->button.y);
790 Geom::Point const motion_dt(desktop->w2d(motion_w));
792 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
793 sp_canvas_end_forced_full_redraws(desktop->canvas);
794 dc->is_drawing = false;
796 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
797 dc->dragging = FALSE;
799 sp_dyna_draw_apply(dc, motion_dt);
801 /* Remove all temporary line segments */
802 while (dc->segments) {
803 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
804 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
805 }
807 /* Create object */
808 fit_and_split(dc, TRUE);
809 if (accumulate_calligraphic(dc))
810 set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
811 else
812 g_warning ("Failed to create path: invalid data in dc->cal1 or dc->cal2");
814 /* reset accumulated curve */
815 dc->accumulated->reset();
817 clear_current(dc);
818 if (dc->repr) {
819 dc->repr = NULL;
820 }
822 if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
823 if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
824 dc->hatch_last_nearest = Geom::Point(0,0);
825 dc->hatch_last_pointer = Geom::Point(0,0);
826 dc->hatch_vector_accumulated = Geom::Point(0,0);
827 dc->hatch_escaped = false;
828 dc->hatch_item = NULL;
829 dc->hatch_livarot_path = NULL;
831 if (dc->hatch_spacing != 0 && !dc->keep_selected) {
832 // we do not select the newly drawn path, so increase spacing by step
833 if (dc->hatch_spacing_step == 0) {
834 dc->hatch_spacing_step = dc->hatch_spacing;
835 }
836 dc->hatch_spacing += dc->hatch_spacing_step;
837 }
839 dc->_message_context->clear();
840 ret = TRUE;
841 }
842 break;
843 }
845 case GDK_KEY_PRESS:
846 switch (get_group0_keyval (&event->key)) {
847 case GDK_Up:
848 case GDK_KP_Up:
849 if (!MOD__CTRL_ONLY) {
850 dc->angle += 5.0;
851 if (dc->angle > 90.0)
852 dc->angle = 90.0;
853 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
854 ret = TRUE;
855 }
856 break;
857 case GDK_Down:
858 case GDK_KP_Down:
859 if (!MOD__CTRL_ONLY) {
860 dc->angle -= 5.0;
861 if (dc->angle < -90.0)
862 dc->angle = -90.0;
863 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
864 ret = TRUE;
865 }
866 break;
867 case GDK_Right:
868 case GDK_KP_Right:
869 if (!MOD__CTRL_ONLY) {
870 dc->width += 0.01;
871 if (dc->width > 1.0)
872 dc->width = 1.0;
873 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
874 ret = TRUE;
875 }
876 break;
877 case GDK_Left:
878 case GDK_KP_Left:
879 if (!MOD__CTRL_ONLY) {
880 dc->width -= 0.01;
881 if (dc->width < 0.01)
882 dc->width = 0.01;
883 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
884 ret = TRUE;
885 }
886 break;
887 case GDK_Home:
888 case GDK_KP_Home:
889 dc->width = 0.01;
890 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
891 ret = TRUE;
892 break;
893 case GDK_End:
894 case GDK_KP_End:
895 dc->width = 1.0;
896 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
897 ret = TRUE;
898 break;
899 case GDK_x:
900 case GDK_X:
901 if (MOD__ALT_ONLY) {
902 desktop->setToolboxFocusTo ("altx-calligraphy");
903 ret = TRUE;
904 }
905 break;
906 case GDK_Escape:
907 if (dc->is_drawing) {
908 // if drawing, cancel, otherwise pass it up for deselecting
909 calligraphic_cancel (dc);
910 ret = TRUE;
911 }
912 break;
913 case GDK_z:
914 case GDK_Z:
915 if (MOD__CTRL_ONLY && dc->is_drawing) {
916 // if drawing, cancel, otherwise pass it up for undo
917 calligraphic_cancel (dc);
918 ret = TRUE;
919 }
920 break;
921 default:
922 break;
923 }
924 break;
926 case GDK_KEY_RELEASE:
927 switch (get_group0_keyval(&event->key)) {
928 case GDK_Control_L:
929 case GDK_Control_R:
930 dc->_message_context->clear();
931 dc->hatch_spacing = 0;
932 dc->hatch_spacing_step = 0;
933 break;
934 default:
935 break;
936 }
938 default:
939 break;
940 }
942 if (!ret) {
943 if (((SPEventContextClass *) dd_parent_class)->root_handler) {
944 ret = ((SPEventContextClass *) dd_parent_class)->root_handler(event_context, event);
945 }
946 }
948 return ret;
949 }
952 static void
953 clear_current(SPDynaDrawContext *dc)
954 {
955 /* reset bpath */
956 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
957 /* reset curve */
958 dc->currentcurve->reset();
959 dc->cal1->reset();
960 dc->cal2->reset();
961 /* reset points */
962 dc->npoints = 0;
963 }
965 static void
966 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
967 {
968 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
970 if (!dc->accumulated->is_empty()) {
971 if (!dc->repr) {
972 /* Create object */
973 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
974 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
976 /* Set style */
977 sp_desktop_apply_style_tool (desktop, repr, "/tools/calligraphic", false);
979 dc->repr = repr;
981 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
982 Inkscape::GC::release(dc->repr);
983 item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
984 item->updateRepr();
985 }
986 Geom::PathVector pathv = dc->accumulated->get_pathvector() * sp_desktop_dt2doc_affine(desktop);
987 gchar *str = sp_svg_write_path(pathv);
988 g_assert( str != NULL );
989 dc->repr->setAttribute("d", str);
990 g_free(str);
992 if (unionize) {
993 sp_desktop_selection(desktop)->add(dc->repr);
994 sp_selected_path_union_skip_undo(desktop);
995 } else {
996 if (dc->keep_selected) {
997 sp_desktop_selection(desktop)->set(dc->repr);
998 }
999 }
1001 } else {
1002 if (dc->repr) {
1003 sp_repr_unparent(dc->repr);
1004 }
1005 dc->repr = NULL;
1006 }
1008 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1009 _("Draw calligraphic stroke"));
1010 }
1012 static void
1013 add_cap(SPCurve *curve,
1014 Geom::Point const &from,
1015 Geom::Point const &to,
1016 double rounding)
1017 {
1018 if (Geom::L2( to - from ) > DYNA_EPSILON) {
1019 Geom::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1020 double mag = Geom::L2(vel);
1022 Geom::Point v = mag * NR::rot90( to - from ) / Geom::L2( to - from );
1023 curve->curveto(from + v, to + v, to);
1024 }
1025 }
1027 static bool
1028 accumulate_calligraphic(SPDynaDrawContext *dc)
1029 {
1030 if (
1031 dc->cal1->is_empty() ||
1032 dc->cal2->is_empty() ||
1033 (dc->cal1->get_segment_count() <= 0) ||
1034 dc->cal1->first_path()->closed()
1035 ) {
1036 dc->cal1->reset();
1037 dc->cal2->reset();
1038 return false; // failure
1039 }
1041 SPCurve *rev_cal2 = dc->cal2->create_reverse();
1042 if (
1043 (rev_cal2->get_segment_count() <= 0) ||
1044 rev_cal2->first_path()->closed()
1045 ) {
1046 rev_cal2->unref();
1047 dc->cal1->reset();
1048 dc->cal2->reset();
1049 return false; // failure
1050 }
1052 Geom::CubicBezier const * dc_cal1_firstseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->first_segment() );
1053 Geom::CubicBezier const * rev_cal2_firstseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->first_segment() );
1054 Geom::CubicBezier const * dc_cal1_lastseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->last_segment() );
1055 Geom::CubicBezier const * rev_cal2_lastseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->last_segment() );
1057 if (
1058 !dc_cal1_firstseg ||
1059 !rev_cal2_firstseg ||
1060 !dc_cal1_lastseg ||
1061 !rev_cal2_lastseg
1062 ) {
1063 rev_cal2->unref();
1064 dc->cal1->reset();
1065 dc->cal2->reset();
1066 return false; // failure
1067 }
1069 dc->accumulated->reset(); /* Is this required ?? */
1071 dc->accumulated->append(dc->cal1, false);
1073 add_cap(dc->accumulated, (*dc_cal1_lastseg)[3], (*rev_cal2_firstseg)[0], dc->cap_rounding);
1075 dc->accumulated->append(rev_cal2, true);
1077 add_cap(dc->accumulated, (*rev_cal2_lastseg)[3], (*dc_cal1_firstseg)[0], dc->cap_rounding);
1079 dc->accumulated->closepath();
1081 rev_cal2->unref();
1083 dc->cal1->reset();
1084 dc->cal2->reset();
1086 return true; // success
1087 }
1089 static double square(double const x)
1090 {
1091 return x * x;
1092 }
1094 static void
1095 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1096 {
1097 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1099 double const tolerance_sq = square( desktop->w2d().descrim() * TOLERANCE_CALLIGRAPHIC );
1101 #ifdef DYNA_DRAW_VERBOSE
1102 g_print("[F&S:R=%c]", release?'T':'F');
1103 #endif
1105 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1106 return; // just clicked
1108 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1109 #define BEZIER_SIZE 4
1110 #define BEZIER_MAX_BEZIERS 8
1111 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1113 #ifdef DYNA_DRAW_VERBOSE
1114 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1115 dc->npoints, release ? "TRUE" : "FALSE");
1116 #endif
1118 /* Current calligraphic */
1119 if ( dc->cal1->is_empty() || dc->cal2->is_empty() ) {
1120 /* dc->npoints > 0 */
1121 /* g_print("calligraphics(1|2) reset\n"); */
1122 dc->cal1->reset();
1123 dc->cal2->reset();
1125 dc->cal1->moveto(dc->point1[0]);
1126 dc->cal2->moveto(dc->point2[0]);
1127 }
1129 Geom::Point b1[BEZIER_MAX_LENGTH];
1130 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1131 tolerance_sq, BEZIER_MAX_BEZIERS);
1132 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1134 Geom::Point b2[BEZIER_MAX_LENGTH];
1135 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1136 tolerance_sq, BEZIER_MAX_BEZIERS);
1137 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1139 if ( nb1 != -1 && nb2 != -1 ) {
1140 /* Fit and draw and reset state */
1141 #ifdef DYNA_DRAW_VERBOSE
1142 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1143 #endif
1144 /* CanvasShape */
1145 if (! release) {
1146 dc->currentcurve->reset();
1147 dc->currentcurve->moveto(b1[0]);
1148 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1149 dc->currentcurve->curveto(bp1[1], bp1[2], bp1[3]);
1150 }
1151 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
1152 for (Geom::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1153 dc->currentcurve->curveto(bp2[2], bp2[1], bp2[0]);
1154 }
1155 // FIXME: dc->segments is always NULL at this point??
1156 if (!dc->segments) { // first segment
1157 add_cap(dc->currentcurve, b2[0], b1[0], dc->cap_rounding);
1158 }
1159 dc->currentcurve->closepath();
1160 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1161 }
1163 /* Current calligraphic */
1164 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1165 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
1166 }
1167 for (Geom::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1168 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
1169 }
1170 } else {
1171 /* fixme: ??? */
1172 #ifdef DYNA_DRAW_VERBOSE
1173 g_print("[fit_and_split] failed to fit-cubic.\n");
1174 #endif
1175 draw_temporary_box(dc);
1177 for (gint i = 1; i < dc->npoints; i++) {
1178 dc->cal1->lineto(dc->point1[i]);
1179 }
1180 for (gint i = 1; i < dc->npoints; i++) {
1181 dc->cal2->lineto(dc->point2[i]);
1182 }
1183 }
1185 /* Fit and draw and copy last point */
1186 #ifdef DYNA_DRAW_VERBOSE
1187 g_print("[%d]Yup\n", dc->npoints);
1188 #endif
1189 if (!release) {
1190 g_assert(!dc->currentcurve->is_empty());
1192 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(desktop),
1193 SP_TYPE_CANVAS_BPATH,
1194 NULL);
1195 SPCurve *curve = dc->currentcurve->copy();
1196 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1197 curve->unref();
1199 guint32 fillColor = sp_desktop_get_color_tool (desktop, "/tools/calligraphic", true);
1200 //guint32 strokeColor = sp_desktop_get_color_tool (desktop, "/tools/calligraphic", false);
1201 double opacity = sp_desktop_get_master_opacity_tool (desktop, "/tools/calligraphic");
1202 double fillOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/calligraphic", true);
1203 //double strokeOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/calligraphic", false);
1204 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1205 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1206 //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);
1207 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1208 /* fixme: Cannot we cascade it to root more clearly? */
1209 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
1211 dc->segments = g_slist_prepend(dc->segments, cbp);
1212 }
1214 dc->point1[0] = dc->point1[dc->npoints - 1];
1215 dc->point2[0] = dc->point2[dc->npoints - 1];
1216 dc->npoints = 1;
1217 } else {
1218 draw_temporary_box(dc);
1219 }
1220 }
1222 static void
1223 draw_temporary_box(SPDynaDrawContext *dc)
1224 {
1225 dc->currentcurve->reset();
1227 dc->currentcurve->moveto(dc->point2[dc->npoints-1]);
1228 for (gint i = dc->npoints-2; i >= 0; i--) {
1229 dc->currentcurve->lineto(dc->point2[i]);
1230 }
1231 for (gint i = 0; i < dc->npoints; i++) {
1232 dc->currentcurve->lineto(dc->point1[i]);
1233 }
1235 if (dc->npoints >= 2) {
1236 add_cap(dc->currentcurve, dc->point1[dc->npoints-1], dc->point2[dc->npoints-1], dc->cap_rounding);
1237 }
1239 dc->currentcurve->closepath();
1240 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1241 }
1243 /*
1244 Local Variables:
1245 mode:c++
1246 c-file-style:"stroustrup"
1247 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1248 indent-tabs-mode:nil
1249 fill-column:99
1250 End:
1251 */
1252 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :