1 /*
2 * Handwriting-like drawing mode
3 *
4 * Authors:
5 * Mitsuru Oka <oka326@parkcity.ne.jp>
6 * Lauris Kaplinski <lauris@kaplinski.com>
7 * bulia byak <buliabyak@users.sf.net>
8 * MenTaLguY <mental@rydia.net>
9 * Abhishek Sharma
10 *
11 * The original dynadraw code:
12 * Paul Haeberli <paul@sgi.com>
13 *
14 * Copyright (C) 1998 The Free Software Foundation
15 * Copyright (C) 1999-2005 authors
16 * Copyright (C) 2001-2002 Ximian, Inc.
17 * Copyright (C) 2005-2007 bulia byak
18 * Copyright (C) 2006 MenTaLguY
19 *
20 * Released under GNU GPL, read the file 'COPYING' for more information
21 */
23 #define noDYNA_DRAW_VERBOSE
25 #include "config.h"
27 #include <gtk/gtk.h>
28 #include <gdk/gdkkeysyms.h>
29 #include <glibmm/i18n.h>
30 #include <string>
31 #include <cstring>
32 #include <numeric>
34 #include "svg/svg.h"
35 #include "display/canvas-bpath.h"
36 #include <2geom/isnan.h>
37 #include <2geom/pathvector.h>
38 #include <2geom/bezier-utils.h>
39 #include "display/curve.h"
40 #include <glib/gmem.h>
41 #include "macros.h"
42 #include "document.h"
43 #include "selection.h"
44 #include "desktop.h"
45 #include "desktop-events.h"
46 #include "desktop-handles.h"
47 #include "desktop-style.h"
48 #include "message-context.h"
49 #include "preferences.h"
50 #include "pixmaps/cursor-calligraphy.xpm"
51 #include "xml/repr.h"
52 #include "context-fns.h"
53 #include "sp-item.h"
54 #include "inkscape.h"
55 #include "color.h"
56 #include "splivarot.h"
57 #include "sp-item-group.h"
58 #include "sp-shape.h"
59 #include "sp-path.h"
60 #include "sp-text.h"
61 #include "display/sp-canvas.h"
62 #include "display/canvas-bpath.h"
63 #include "display/canvas-arena.h"
64 #include "livarot/Shape.h"
66 #include "dyna-draw-context.h"
68 using Inkscape::DocumentUndo;
70 #define DDC_RED_RGBA 0xff0000ff
72 #define TOLERANCE_CALLIGRAPHIC 0.1
74 #define DYNA_EPSILON 0.5e-6
75 #define DYNA_EPSILON_START 0.5e-2
76 #define DYNA_VEL_START 1e-5
78 #define DYNA_MIN_WIDTH 1.0e-6
80 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
81 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
82 static void sp_dyna_draw_context_dispose(GObject *object);
84 static void sp_dyna_draw_context_setup(SPEventContext *ec);
85 static void sp_dyna_draw_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *value);
86 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
88 static void clear_current(SPDynaDrawContext *dc);
89 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize, bool subtract);
90 static void add_cap(SPCurve *curve, Geom::Point const &from, Geom::Point const &to, double rounding);
91 static bool accumulate_calligraphic(SPDynaDrawContext *dc);
93 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
95 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, Geom::Point p);
96 static Geom::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, Geom::Point v);
97 static Geom::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, Geom::Point n);
98 static void draw_temporary_box(SPDynaDrawContext *dc);
101 static SPEventContextClass *dd_parent_class = 0;
103 GType sp_dyna_draw_context_get_type(void)
104 {
105 static GType type = 0;
106 if (!type) {
107 GTypeInfo info = {
108 sizeof(SPDynaDrawContextClass),
109 0, // base_init
110 0, // base_finalize
111 (GClassInitFunc)sp_dyna_draw_context_class_init,
112 0, // class_finalize
113 0, // class_data
114 sizeof(SPDynaDrawContext),
115 0, // n_preallocs
116 (GInstanceInitFunc)sp_dyna_draw_context_init,
117 0 // value_table
118 };
119 type = g_type_register_static(SP_TYPE_COMMON_CONTEXT, "SPDynaDrawContext", &info, static_cast<GTypeFlags>(0));
120 }
121 return type;
122 }
124 static void
125 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
126 {
127 GObjectClass *object_class = (GObjectClass *) klass;
128 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
130 dd_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
132 object_class->dispose = sp_dyna_draw_context_dispose;
134 event_context_class->setup = sp_dyna_draw_context_setup;
135 event_context_class->set = sp_dyna_draw_context_set;
136 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
137 }
139 static void
140 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
141 {
142 ddc->cursor_shape = cursor_calligraphy_xpm;
143 ddc->hot_x = 4;
144 ddc->hot_y = 4;
146 ddc->vel_thin = 0.1;
147 ddc->flatness = 0.9;
148 ddc->cap_rounding = 0.0;
150 ddc->abs_width = false;
151 ddc->keep_selected = true;
153 ddc->hatch_spacing = 0;
154 ddc->hatch_spacing_step = 0;
155 new (&ddc->hatch_pointer_past) std::list<double>();
156 new (&ddc->hatch_nearest_past) std::list<double>();
157 new (&ddc->inertia_vectors) std::list<Geom::Point>();
158 new (&ddc->hatch_vectors) std::list<Geom::Point>();
159 ddc->hatch_last_nearest = Geom::Point(0,0);
160 ddc->hatch_last_pointer = Geom::Point(0,0);
161 ddc->hatch_escaped = false;
162 ddc->hatch_area = NULL;
163 ddc->hatch_item = NULL;
164 ddc->hatch_livarot_path = NULL;
166 ddc->trace_bg = false;
167 ddc->just_started_drawing = 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 ddc->inertia_vectors.~list();
186 ddc->hatch_vectors.~list();
187 }
189 static void
190 sp_dyna_draw_context_setup(SPEventContext *ec)
191 {
192 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
194 if (((SPEventContextClass *) dd_parent_class)->setup)
195 ((SPEventContextClass *) dd_parent_class)->setup(ec);
197 ddc->accumulated = new SPCurve();
198 ddc->currentcurve = new SPCurve();
200 ddc->cal1 = new SPCurve();
201 ddc->cal2 = new SPCurve();
203 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
204 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
205 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
206 /* fixme: Cannot we cascade it to root more clearly? */
207 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
209 {
210 /* 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) */
211 SPCurve *c = new SPCurve();
212 const double C1 = 0.552;
213 c->moveto(-1,0);
214 c->curveto(-1, C1, -C1, 1, 0, 1 );
215 c->curveto(C1, 1, 1, C1, 1, 0 );
216 c->curveto(1, -C1, C1, -1, 0, -1 );
217 c->curveto(-C1, -1, -1, -C1, -1, 0 );
218 c->closepath();
219 ddc->hatch_area = sp_canvas_bpath_new(sp_desktop_controls(ec->desktop), c);
220 c->unref();
221 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->hatch_area), 0x00000000,(SPWindRule)0);
222 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->hatch_area), 0x0000007f, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
223 sp_canvas_item_hide(ddc->hatch_area);
224 }
226 sp_event_context_read(ec, "mass");
227 sp_event_context_read(ec, "wiggle");
228 sp_event_context_read(ec, "angle");
229 sp_event_context_read(ec, "width");
230 sp_event_context_read(ec, "thinning");
231 sp_event_context_read(ec, "tremor");
232 sp_event_context_read(ec, "flatness");
233 sp_event_context_read(ec, "tracebackground");
234 sp_event_context_read(ec, "usepressure");
235 sp_event_context_read(ec, "usetilt");
236 sp_event_context_read(ec, "abs_width");
237 sp_event_context_read(ec, "keep_selected");
238 sp_event_context_read(ec, "cap_rounding");
240 ddc->is_drawing = false;
241 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
243 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
244 if (prefs->getBool("/tools/calligraphic/selcue")) {
245 ec->enableSelectionCue();
246 }
247 }
249 static void
250 sp_dyna_draw_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
251 {
252 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
253 Glib::ustring path = val->getEntryName();
255 if (path == "tracebackground") {
256 ddc->trace_bg = val->getBool();
257 } else if (path == "keep_selected") {
258 ddc->keep_selected = val->getBool();
259 } else {
260 //pass on up to parent class to handle common attributes.
261 if ( dd_parent_class->set ) {
262 dd_parent_class->set(ec, val);
263 }
264 }
266 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
267 }
269 static double
270 flerp(double f0, double f1, double p)
271 {
272 return f0 + ( f1 - f0 ) * p;
273 }
275 /* Get normalized point */
276 static Geom::Point
277 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, Geom::Point v)
278 {
279 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
280 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
281 return Geom::Point(( v[Geom::X] - drect.min()[Geom::X] ) / max, ( v[Geom::Y] - drect.min()[Geom::Y] ) / max);
282 }
284 /* Get view point */
285 static Geom::Point
286 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, Geom::Point n)
287 {
288 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
289 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
290 return Geom::Point(n[Geom::X] * max + drect.min()[Geom::X], n[Geom::Y] * max + drect.min()[Geom::Y]);
291 }
293 static void
294 sp_dyna_draw_reset(SPDynaDrawContext *dc, Geom::Point p)
295 {
296 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
297 dc->vel = Geom::Point(0,0);
298 dc->vel_max = 0;
299 dc->acc = Geom::Point(0,0);
300 dc->ang = Geom::Point(0,0);
301 dc->del = Geom::Point(0,0);
302 }
304 static void
305 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
306 {
307 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
308 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
309 else
310 dc->pressure = DDC_DEFAULT_PRESSURE;
312 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
313 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
314 else
315 dc->xtilt = DDC_DEFAULT_TILT;
317 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
318 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
319 else
320 dc->ytilt = DDC_DEFAULT_TILT;
321 }
324 static gboolean
325 sp_dyna_draw_apply(SPDynaDrawContext *dc, Geom::Point p)
326 {
327 Geom::Point n = sp_dyna_draw_get_npoint(dc, p);
329 /* Calculate mass and drag */
330 double const mass = flerp(1.0, 160.0, dc->mass);
331 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
333 /* Calculate force and acceleration */
334 Geom::Point force = n - dc->cur;
336 // If force is below the absolute threshold DYNA_EPSILON,
337 // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
338 // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
339 // discard this move.
340 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
341 // especially bothersome at the start of the stroke where we don't yet have the inertia to
342 // smooth them out.
343 if ( Geom::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && Geom::L2(force) < DYNA_EPSILON_START)) {
344 return FALSE;
345 }
347 dc->acc = force / mass;
349 /* Calculate new velocity */
350 dc->vel += dc->acc;
352 if (Geom::L2(dc->vel) > dc->vel_max)
353 dc->vel_max = Geom::L2(dc->vel);
355 /* Calculate angle of drawing tool */
357 double a1;
358 if (dc->usetilt) {
359 // 1a. calculate nib angle from input device tilt:
360 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
362 if (length > 0) {
363 Geom::Point ang1 = Geom::Point(dc->ytilt/length, dc->xtilt/length);
364 a1 = atan2(ang1);
365 }
366 else
367 a1 = 0.0;
368 }
369 else {
370 // 1b. fixed dc->angle (absolutely flat nib):
371 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
372 Geom::Point ang1 = Geom::Point(-sin(radians), cos(radians));
373 a1 = atan2(ang1);
374 }
376 // 2. perpendicular to dc->vel (absolutely non-flat nib):
377 gdouble const mag_vel = Geom::L2(dc->vel);
378 if ( mag_vel < DYNA_EPSILON ) {
379 return FALSE;
380 }
381 Geom::Point ang2 = Geom::rot90(dc->vel) / mag_vel;
383 // 3. Average them using flatness parameter:
384 // calculate angles
385 double a2 = atan2(ang2);
386 // flip a2 to force it to be in the same half-circle as a1
387 bool flipped = false;
388 if (fabs (a2-a1) > 0.5*M_PI) {
389 a2 += M_PI;
390 flipped = true;
391 }
392 // normalize a2
393 if (a2 > M_PI)
394 a2 -= 2*M_PI;
395 if (a2 < -M_PI)
396 a2 += 2*M_PI;
397 // find the flatness-weighted bisector angle, unflip if a2 was flipped
398 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
399 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
401 // Try to detect a sudden flip when the new angle differs too much from the previous for the
402 // current velocity; in that case discard this move
403 double angle_delta = Geom::L2(Geom::Point (cos (new_ang), sin (new_ang)) - dc->ang);
404 if ( angle_delta / Geom::L2(dc->vel) > 4000 ) {
405 return FALSE;
406 }
408 // convert to point
409 dc->ang = Geom::Point (cos (new_ang), sin (new_ang));
411 // g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", Geom::L2(force), Geom::L2(dc->acc), dc->vel_max, Geom::L2(dc->vel), a1, a2, new_ang);
413 /* Apply drag */
414 dc->vel *= 1.0 - drag;
416 /* Update position */
417 dc->last = dc->cur;
418 dc->cur += dc->vel;
420 return TRUE;
421 }
423 static void
424 sp_dyna_draw_brush(SPDynaDrawContext *dc)
425 {
426 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
428 // How much velocity thins strokestyle
429 double vel_thin = flerp (0, 160, dc->vel_thin);
431 // Influence of pressure on thickness
432 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
434 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
435 // drag)
436 Geom::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
437 Geom::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
439 double trace_thick = 1;
440 if (dc->trace_bg) {
441 // pick single pixel
442 NRPixBlock pb;
443 int x = (int) floor(brush_w[Geom::X]);
444 int y = (int) floor(brush_w[Geom::Y]);
445 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
446 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
447 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
448 double R = s[0] / 255.0;
449 double G = s[1] / 255.0;
450 double B = s[2] / 255.0;
451 double A = s[3] / 255.0;
452 double max = MAX (MAX (R, G), B);
453 double min = MIN (MIN (R, G), B);
454 double L = A * (max + min)/2 + (1 - A); // blend with white bg
455 trace_thick = 1 - L;
456 //g_print ("L %g thick %g\n", L, trace_thick);
457 }
459 double width = (pressure_thick * trace_thick - vel_thin * Geom::L2(dc->vel)) * dc->width;
461 double tremble_left = 0, tremble_right = 0;
462 if (dc->tremor > 0) {
463 // obtain two normally distributed random variables, using polar Box-Muller transform
464 double x1, x2, w, y1, y2;
465 do {
466 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
467 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
468 w = x1 * x1 + x2 * x2;
469 } while ( w >= 1.0 );
470 w = sqrt( (-2.0 * log( w ) ) / w );
471 y1 = x1 * w;
472 y2 = x2 * w;
474 // deflect both left and right edges randomly and independently, so that:
475 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
476 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
477 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
478 // comparatively smooth and slow ones excessively jittery
479 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
480 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
481 }
483 if ( width < 0.02 * dc->width ) {
484 width = 0.02 * dc->width;
485 }
487 double dezoomify_factor = 0.05 * 1000;
488 if (!dc->abs_width) {
489 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
490 }
492 Geom::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
493 Geom::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
495 dc->point1[dc->npoints] = brush + del_left;
496 dc->point2[dc->npoints] = brush - del_right;
498 dc->del = 0.5*(del_left + del_right);
500 dc->npoints++;
501 }
503 void
504 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
505 {
506 desktop->setToolboxAdjustmentValue (id, value);
507 }
509 static void
510 calligraphic_cancel(SPDynaDrawContext *dc)
511 {
512 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
513 dc->dragging = FALSE;
514 dc->is_drawing = false;
515 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
516 /* Remove all temporary line segments */
517 while (dc->segments) {
518 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
519 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
520 }
521 /* reset accumulated curve */
522 dc->accumulated->reset();
523 clear_current(dc);
524 if (dc->repr) {
525 dc->repr = NULL;
526 }
527 }
530 gint
531 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
532 GdkEvent *event)
533 {
534 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
535 SPDesktop *desktop = event_context->desktop;
537 gint ret = FALSE;
539 switch (event->type) {
540 case GDK_BUTTON_PRESS:
541 if (event->button.button == 1 && !event_context->space_panning) {
543 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
545 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
546 return TRUE;
547 }
549 dc->accumulated->reset();
550 if (dc->repr) {
551 dc->repr = NULL;
552 }
554 /* initialize first point */
555 dc->npoints = 0;
557 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
558 ( GDK_KEY_PRESS_MASK |
559 GDK_BUTTON_RELEASE_MASK |
560 GDK_POINTER_MOTION_MASK |
561 GDK_BUTTON_PRESS_MASK ),
562 NULL,
563 event->button.time);
565 ret = TRUE;
567 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
568 dc->is_drawing = true;
569 dc->just_started_drawing = true;
570 }
571 break;
572 case GDK_MOTION_NOTIFY:
573 {
574 Geom::Point const motion_w(event->motion.x,
575 event->motion.y);
576 Geom::Point motion_dt(desktop->w2d(motion_w));
577 sp_dyna_draw_extinput(dc, event);
579 dc->_message_context->clear();
581 // for hatching:
582 double hatch_dist = 0;
583 Geom::Point hatch_unit_vector(0,0);
584 Geom::Point nearest(0,0);
585 Geom::Point pointer(0,0);
586 Geom::Matrix motion_to_curve(Geom::identity());
588 if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
590 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
591 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
592 // One item selected, and it's a path;
593 // let's try to track it as a guide
595 if (selected != dc->hatch_item) {
596 dc->hatch_item = selected;
597 if (dc->hatch_livarot_path)
598 delete dc->hatch_livarot_path;
599 dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
600 dc->hatch_livarot_path->ConvertWithBackData(0.01);
601 }
603 // calculate pointer point in the guide item's coords
604 motion_to_curve = selected->dt2i_affine() * selected->i2doc_affine();
605 pointer = motion_dt * motion_to_curve;
607 // calculate the nearest point on the guide path
608 boost::optional<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
609 nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
612 // distance from pointer to nearest
613 hatch_dist = Geom::L2(pointer - nearest);
614 // unit-length vector
615 hatch_unit_vector = (pointer - nearest)/hatch_dist;
617 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
618 } else {
619 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
620 }
621 }
623 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
624 dc->dragging = TRUE;
626 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
628 #define HATCH_VECTOR_ELEMENTS 12
629 #define INERTIA_ELEMENTS 24
630 #define SPEED_ELEMENTS 12
631 #define SPEED_MIN 0.3
632 #define SPEED_NORMAL 0.35
633 #define INERTIA_FORCE 0.5
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[Geom::X], dc->last_nearest[Geom::Y], nearest[Geom::X], nearest[Geom::Y], pointer[Geom::X], pointer[Geom::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 if (dc->inertia_vectors.size() >= INERTIA_ELEMENTS/2) { // move by inertia
685 Geom::Point moved_past_escape = motion_dt - dc->inertia_vectors.front();
686 Geom::Point inertia =
687 dc->inertia_vectors.front() - dc->inertia_vectors.back();
689 double dot = Geom::dot (moved_past_escape, inertia);
690 dot /= Geom::L2(moved_past_escape) * Geom::L2(inertia);
692 if (dot > 0) { // mouse is still moving in approx the same direction
693 Geom::Point should_have_moved =
694 (inertia) * (1/Geom::L2(inertia)) * Geom::L2(moved_past_escape);
695 motion_dt = dc->inertia_vectors.front() +
696 (INERTIA_FORCE * should_have_moved + (1 - INERTIA_FORCE) * moved_past_escape);
697 }
698 }
700 } else {
702 // Calculate angle cosine of this vector-to-guide and all past vectors
703 // summed, to detect if we accidentally flipped to the other side of the
704 // guide
705 Geom::Point hatch_vector_accumulated = std::accumulate
706 (dc->hatch_vectors.begin(), dc->hatch_vectors.end(), Geom::Point(0,0));
707 double dot = Geom::dot (pointer - nearest, hatch_vector_accumulated);
708 dot /= Geom::L2(pointer - nearest) * Geom::L2(hatch_vector_accumulated);
710 if (dc->hatch_spacing != 0) { // spacing was already set
711 double target;
712 if (speed > SPEED_NORMAL) {
713 // all ok, strictly obey the spacing
714 target = dc->hatch_spacing;
715 } else {
716 // looks like we're starting to lose speed,
717 // so _gradually_ let go attraction to prevent jerks
718 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
719 }
720 if (!IS_NAN(dot) && dot < -0.5) {// flip
721 target = -target;
722 }
724 // This is the track pointer that we will use instead of the real one
725 Geom::Point new_pointer = nearest + target * hatch_unit_vector;
727 // some limited feedback: allow persistent pulling to slightly change
728 // the spacing
729 dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
731 // return it to the desktop coords
732 motion_dt = new_pointer * motion_to_curve.inverse();
734 if (speed >= SPEED_NORMAL) {
735 dc->inertia_vectors.push_front(motion_dt);
736 if (dc->inertia_vectors.size() > INERTIA_ELEMENTS)
737 dc->inertia_vectors.pop_back();
738 }
740 } else {
741 // this is the first motion event, set the dist
742 dc->hatch_spacing = hatch_dist;
743 }
745 // remember last points
746 dc->hatch_last_pointer = pointer;
747 dc->hatch_last_nearest = nearest;
749 dc->hatch_vectors.push_front(pointer - nearest);
750 if (dc->hatch_vectors.size() > HATCH_VECTOR_ELEMENTS)
751 dc->hatch_vectors.pop_back();
752 }
754 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
756 } else {
757 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
758 }
760 if (dc->just_started_drawing) {
761 dc->just_started_drawing = false;
762 sp_dyna_draw_reset(dc, motion_dt);
763 }
765 if (!sp_dyna_draw_apply(dc, motion_dt)) {
766 ret = TRUE;
767 break;
768 }
770 if ( dc->cur != dc->last ) {
771 sp_dyna_draw_brush(dc);
772 g_assert( dc->npoints > 0 );
773 fit_and_split(dc, FALSE);
774 }
775 ret = TRUE;
776 }
778 // Draw the hatching circle if necessary
779 if (event->motion.state & GDK_CONTROL_MASK) {
780 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
781 // Haven't set spacing yet: gray, center free, update radius live
782 Geom::Point c = desktop->w2d(motion_w);
783 Geom::Matrix const sm (Geom::Scale(hatch_dist, hatch_dist) * Geom::Translate(c));
784 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
785 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
786 sp_canvas_item_show(dc->hatch_area);
787 } else if (dc->dragging && !dc->hatch_escaped) {
788 // Tracking: green, center snapped, fixed radius
789 Geom::Point c = motion_dt;
790 Geom::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
791 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
792 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
793 sp_canvas_item_show(dc->hatch_area);
794 } else if (dc->dragging && dc->hatch_escaped) {
795 // Tracking escaped: red, center free, fixed radius
796 Geom::Point c = motion_dt;
797 Geom::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
799 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
800 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
801 sp_canvas_item_show(dc->hatch_area);
802 } else {
803 // Not drawing but spacing set: gray, center snapped, fixed radius
804 Geom::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
805 if (!IS_NAN(c[Geom::X]) && !IS_NAN(c[Geom::Y])) {
806 Geom::Matrix const sm (Geom::Scale(dc->hatch_spacing, dc->hatch_spacing) * Geom::Translate(c));
807 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
808 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
809 sp_canvas_item_show(dc->hatch_area);
810 }
811 }
812 } else {
813 sp_canvas_item_hide(dc->hatch_area);
814 }
815 }
816 break;
819 case GDK_BUTTON_RELEASE:
820 {
821 Geom::Point const motion_w(event->button.x, event->button.y);
822 Geom::Point const motion_dt(desktop->w2d(motion_w));
824 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
825 sp_canvas_end_forced_full_redraws(desktop->canvas);
826 dc->is_drawing = false;
828 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
829 dc->dragging = FALSE;
831 sp_dyna_draw_apply(dc, motion_dt);
833 /* Remove all temporary line segments */
834 while (dc->segments) {
835 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
836 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
837 }
839 /* Create object */
840 fit_and_split(dc, TRUE);
841 if (accumulate_calligraphic(dc))
842 set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK, event->button.state & GDK_MOD1_MASK); // performs document_done
843 else
844 g_warning ("Failed to create path: invalid data in dc->cal1 or dc->cal2");
846 /* reset accumulated curve */
847 dc->accumulated->reset();
849 clear_current(dc);
850 if (dc->repr) {
851 dc->repr = NULL;
852 }
854 if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
855 if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
856 if (!dc->inertia_vectors.empty()) dc->inertia_vectors.clear();
857 if (!dc->hatch_vectors.empty()) dc->hatch_vectors.clear();
858 dc->hatch_last_nearest = Geom::Point(0,0);
859 dc->hatch_last_pointer = Geom::Point(0,0);
860 dc->hatch_escaped = false;
861 dc->hatch_item = NULL;
862 dc->hatch_livarot_path = NULL;
863 dc->just_started_drawing = false;
865 if (dc->hatch_spacing != 0 && !dc->keep_selected) {
866 // we do not select the newly drawn path, so increase spacing by step
867 if (dc->hatch_spacing_step == 0) {
868 dc->hatch_spacing_step = dc->hatch_spacing;
869 }
870 dc->hatch_spacing += dc->hatch_spacing_step;
871 }
873 dc->_message_context->clear();
874 ret = TRUE;
875 }
876 break;
877 }
879 case GDK_KEY_PRESS:
880 switch (get_group0_keyval (&event->key)) {
881 case GDK_Up:
882 case GDK_KP_Up:
883 if (!MOD__CTRL_ONLY) {
884 dc->angle += 5.0;
885 if (dc->angle > 90.0)
886 dc->angle = 90.0;
887 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
888 ret = TRUE;
889 }
890 break;
891 case GDK_Down:
892 case GDK_KP_Down:
893 if (!MOD__CTRL_ONLY) {
894 dc->angle -= 5.0;
895 if (dc->angle < -90.0)
896 dc->angle = -90.0;
897 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
898 ret = TRUE;
899 }
900 break;
901 case GDK_Right:
902 case GDK_KP_Right:
903 if (!MOD__CTRL_ONLY) {
904 dc->width += 0.01;
905 if (dc->width > 1.0)
906 dc->width = 1.0;
907 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
908 ret = TRUE;
909 }
910 break;
911 case GDK_Left:
912 case GDK_KP_Left:
913 if (!MOD__CTRL_ONLY) {
914 dc->width -= 0.01;
915 if (dc->width < 0.01)
916 dc->width = 0.01;
917 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
918 ret = TRUE;
919 }
920 break;
921 case GDK_Home:
922 case GDK_KP_Home:
923 dc->width = 0.01;
924 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
925 ret = TRUE;
926 break;
927 case GDK_End:
928 case GDK_KP_End:
929 dc->width = 1.0;
930 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
931 ret = TRUE;
932 break;
933 case GDK_x:
934 case GDK_X:
935 if (MOD__ALT_ONLY) {
936 desktop->setToolboxFocusTo ("altx-calligraphy");
937 ret = TRUE;
938 }
939 break;
940 case GDK_Escape:
941 if (dc->is_drawing) {
942 // if drawing, cancel, otherwise pass it up for deselecting
943 calligraphic_cancel (dc);
944 ret = TRUE;
945 }
946 break;
947 case GDK_z:
948 case GDK_Z:
949 if (MOD__CTRL_ONLY && dc->is_drawing) {
950 // if drawing, cancel, otherwise pass it up for undo
951 calligraphic_cancel (dc);
952 ret = TRUE;
953 }
954 break;
955 default:
956 break;
957 }
958 break;
960 case GDK_KEY_RELEASE:
961 switch (get_group0_keyval(&event->key)) {
962 case GDK_Control_L:
963 case GDK_Control_R:
964 dc->_message_context->clear();
965 dc->hatch_spacing = 0;
966 dc->hatch_spacing_step = 0;
967 break;
968 default:
969 break;
970 }
972 default:
973 break;
974 }
976 if (!ret) {
977 if (((SPEventContextClass *) dd_parent_class)->root_handler) {
978 ret = ((SPEventContextClass *) dd_parent_class)->root_handler(event_context, event);
979 }
980 }
982 return ret;
983 }
986 static void
987 clear_current(SPDynaDrawContext *dc)
988 {
989 /* reset bpath */
990 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
991 /* reset curve */
992 dc->currentcurve->reset();
993 dc->cal1->reset();
994 dc->cal2->reset();
995 /* reset points */
996 dc->npoints = 0;
997 }
999 static void
1000 set_to_accumulated(SPDynaDrawContext *dc, bool unionize, bool subtract)
1001 {
1002 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1004 if (!dc->accumulated->is_empty()) {
1005 if (!dc->repr) {
1006 /* Create object */
1007 Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
1008 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
1010 /* Set style */
1011 sp_desktop_apply_style_tool (desktop, repr, "/tools/calligraphic", false);
1013 dc->repr = repr;
1015 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
1016 Inkscape::GC::release(dc->repr);
1017 item->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
1018 item->updateRepr();
1019 }
1020 Geom::PathVector pathv = dc->accumulated->get_pathvector() * desktop->dt2doc();
1021 gchar *str = sp_svg_write_path(pathv);
1022 g_assert( str != NULL );
1023 dc->repr->setAttribute("d", str);
1024 g_free(str);
1026 if (unionize) {
1027 sp_desktop_selection(desktop)->add(dc->repr);
1028 sp_selected_path_union_skip_undo(desktop);
1029 } else if (subtract) {
1030 sp_desktop_selection(desktop)->add(dc->repr);
1031 sp_selected_path_diff_skip_undo(desktop);
1032 } else {
1033 if (dc->keep_selected) {
1034 sp_desktop_selection(desktop)->set(dc->repr);
1035 }
1036 }
1038 } else {
1039 if (dc->repr) {
1040 sp_repr_unparent(dc->repr);
1041 }
1042 dc->repr = NULL;
1043 }
1045 DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1046 _("Draw calligraphic stroke"));
1047 }
1049 static void
1050 add_cap(SPCurve *curve,
1051 Geom::Point const &from,
1052 Geom::Point const &to,
1053 double rounding)
1054 {
1055 if (Geom::L2( to - from ) > DYNA_EPSILON) {
1056 Geom::Point vel = rounding * Geom::rot90( to - from ) / sqrt(2.0);
1057 double mag = Geom::L2(vel);
1059 Geom::Point v = mag * Geom::rot90( to - from ) / Geom::L2( to - from );
1060 curve->curveto(from + v, to + v, to);
1061 }
1062 }
1064 static bool
1065 accumulate_calligraphic(SPDynaDrawContext *dc)
1066 {
1067 if (
1068 dc->cal1->is_empty() ||
1069 dc->cal2->is_empty() ||
1070 (dc->cal1->get_segment_count() <= 0) ||
1071 dc->cal1->first_path()->closed()
1072 ) {
1073 dc->cal1->reset();
1074 dc->cal2->reset();
1075 return false; // failure
1076 }
1078 SPCurve *rev_cal2 = dc->cal2->create_reverse();
1079 if (
1080 (rev_cal2->get_segment_count() <= 0) ||
1081 rev_cal2->first_path()->closed()
1082 ) {
1083 rev_cal2->unref();
1084 dc->cal1->reset();
1085 dc->cal2->reset();
1086 return false; // failure
1087 }
1089 Geom::CubicBezier const * dc_cal1_firstseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->first_segment() );
1090 Geom::CubicBezier const * rev_cal2_firstseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->first_segment() );
1091 Geom::CubicBezier const * dc_cal1_lastseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->last_segment() );
1092 Geom::CubicBezier const * rev_cal2_lastseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->last_segment() );
1094 if (
1095 !dc_cal1_firstseg ||
1096 !rev_cal2_firstseg ||
1097 !dc_cal1_lastseg ||
1098 !rev_cal2_lastseg
1099 ) {
1100 rev_cal2->unref();
1101 dc->cal1->reset();
1102 dc->cal2->reset();
1103 return false; // failure
1104 }
1106 dc->accumulated->reset(); /* Is this required ?? */
1108 dc->accumulated->append(dc->cal1, false);
1110 add_cap(dc->accumulated, (*dc_cal1_lastseg)[3], (*rev_cal2_firstseg)[0], dc->cap_rounding);
1112 dc->accumulated->append(rev_cal2, true);
1114 add_cap(dc->accumulated, (*rev_cal2_lastseg)[3], (*dc_cal1_firstseg)[0], dc->cap_rounding);
1116 dc->accumulated->closepath();
1118 rev_cal2->unref();
1120 dc->cal1->reset();
1121 dc->cal2->reset();
1123 return true; // success
1124 }
1126 static double square(double const x)
1127 {
1128 return x * x;
1129 }
1131 static void
1132 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1133 {
1134 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
1136 double const tolerance_sq = square( desktop->w2d().descrim() * TOLERANCE_CALLIGRAPHIC );
1138 #ifdef DYNA_DRAW_VERBOSE
1139 g_print("[F&S:R=%c]", release?'T':'F');
1140 #endif
1142 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1143 return; // just clicked
1145 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1146 #define BEZIER_SIZE 4
1147 #define BEZIER_MAX_BEZIERS 8
1148 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1150 #ifdef DYNA_DRAW_VERBOSE
1151 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1152 dc->npoints, release ? "TRUE" : "FALSE");
1153 #endif
1155 /* Current calligraphic */
1156 if ( dc->cal1->is_empty() || dc->cal2->is_empty() ) {
1157 /* dc->npoints > 0 */
1158 /* g_print("calligraphics(1|2) reset\n"); */
1159 dc->cal1->reset();
1160 dc->cal2->reset();
1162 dc->cal1->moveto(dc->point1[0]);
1163 dc->cal2->moveto(dc->point2[0]);
1164 }
1166 Geom::Point b1[BEZIER_MAX_LENGTH];
1167 gint const nb1 = Geom::bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1168 tolerance_sq, BEZIER_MAX_BEZIERS);
1169 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1171 Geom::Point b2[BEZIER_MAX_LENGTH];
1172 gint const nb2 = Geom::bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1173 tolerance_sq, BEZIER_MAX_BEZIERS);
1174 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1176 if ( nb1 != -1 && nb2 != -1 ) {
1177 /* Fit and draw and reset state */
1178 #ifdef DYNA_DRAW_VERBOSE
1179 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1180 #endif
1181 /* CanvasShape */
1182 if (! release) {
1183 dc->currentcurve->reset();
1184 dc->currentcurve->moveto(b1[0]);
1185 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1186 dc->currentcurve->curveto(bp1[1], bp1[2], bp1[3]);
1187 }
1188 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
1189 for (Geom::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1190 dc->currentcurve->curveto(bp2[2], bp2[1], bp2[0]);
1191 }
1192 // FIXME: dc->segments is always NULL at this point??
1193 if (!dc->segments) { // first segment
1194 add_cap(dc->currentcurve, b2[0], b1[0], dc->cap_rounding);
1195 }
1196 dc->currentcurve->closepath();
1197 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1198 }
1200 /* Current calligraphic */
1201 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1202 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
1203 }
1204 for (Geom::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1205 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
1206 }
1207 } else {
1208 /* fixme: ??? */
1209 #ifdef DYNA_DRAW_VERBOSE
1210 g_print("[fit_and_split] failed to fit-cubic.\n");
1211 #endif
1212 draw_temporary_box(dc);
1214 for (gint i = 1; i < dc->npoints; i++) {
1215 dc->cal1->lineto(dc->point1[i]);
1216 }
1217 for (gint i = 1; i < dc->npoints; i++) {
1218 dc->cal2->lineto(dc->point2[i]);
1219 }
1220 }
1222 /* Fit and draw and copy last point */
1223 #ifdef DYNA_DRAW_VERBOSE
1224 g_print("[%d]Yup\n", dc->npoints);
1225 #endif
1226 if (!release) {
1227 g_assert(!dc->currentcurve->is_empty());
1229 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(desktop),
1230 SP_TYPE_CANVAS_BPATH,
1231 NULL);
1232 SPCurve *curve = dc->currentcurve->copy();
1233 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1234 curve->unref();
1236 guint32 fillColor = sp_desktop_get_color_tool (desktop, "/tools/calligraphic", true);
1237 //guint32 strokeColor = sp_desktop_get_color_tool (desktop, "/tools/calligraphic", false);
1238 double opacity = sp_desktop_get_master_opacity_tool (desktop, "/tools/calligraphic");
1239 double fillOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/calligraphic", true);
1240 //double strokeOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/calligraphic", false);
1241 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1242 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1243 //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);
1244 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1245 /* fixme: Cannot we cascade it to root more clearly? */
1246 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
1248 dc->segments = g_slist_prepend(dc->segments, cbp);
1249 }
1251 dc->point1[0] = dc->point1[dc->npoints - 1];
1252 dc->point2[0] = dc->point2[dc->npoints - 1];
1253 dc->npoints = 1;
1254 } else {
1255 draw_temporary_box(dc);
1256 }
1257 }
1259 static void
1260 draw_temporary_box(SPDynaDrawContext *dc)
1261 {
1262 dc->currentcurve->reset();
1264 dc->currentcurve->moveto(dc->point2[dc->npoints-1]);
1265 for (gint i = dc->npoints-2; i >= 0; i--) {
1266 dc->currentcurve->lineto(dc->point2[i]);
1267 }
1268 for (gint i = 0; i < dc->npoints; i++) {
1269 dc->currentcurve->lineto(dc->point1[i]);
1270 }
1272 if (dc->npoints >= 2) {
1273 add_cap(dc->currentcurve, dc->point1[dc->npoints-1], dc->point2[dc->npoints-1], dc->cap_rounding);
1274 }
1276 dc->currentcurve->closepath();
1277 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1278 }
1280 /*
1281 Local Variables:
1282 mode:c++
1283 c-file-style:"stroustrup"
1284 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1285 indent-tabs-mode:nil
1286 fill-column:99
1287 End:
1288 */
1289 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :