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 "prefs-utils.h"
50 #include "pixmaps/cursor-calligraphy.xpm"
51 #include "libnr/n-art-bpath.h"
52 #include "libnr/nr-path.h"
53 #include "libnr/nr-matrix-ops.h"
54 #include "libnr/nr-scale-translate-ops.h"
55 #include "libnr/nr-convert2geom.h"
56 #include "xml/repr.h"
57 #include "context-fns.h"
58 #include "sp-item.h"
59 #include "inkscape.h"
60 #include "color.h"
61 #include "splivarot.h"
62 #include "sp-item-group.h"
63 #include "sp-shape.h"
64 #include "sp-path.h"
65 #include "sp-text.h"
66 #include "display/canvas-bpath.h"
67 #include "display/canvas-arena.h"
68 #include "livarot/Shape.h"
69 #include <2geom/isnan.h>
70 #include <2geom/pathvector.h>
72 #include "dyna-draw-context.h"
74 #define DDC_RED_RGBA 0xff0000ff
76 #define TOLERANCE_CALLIGRAPHIC 0.1
78 #define DYNA_EPSILON 0.5e-6
79 #define DYNA_EPSILON_START 0.5e-2
80 #define DYNA_VEL_START 1e-5
82 #define DYNA_MIN_WIDTH 1.0e-6
84 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
85 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
86 static void sp_dyna_draw_context_dispose(GObject *object);
88 static void sp_dyna_draw_context_setup(SPEventContext *ec);
89 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
90 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
92 static void clear_current(SPDynaDrawContext *dc);
93 static void set_to_accumulated(SPDynaDrawContext *dc, bool unionize);
94 static void add_cap(SPCurve *curve, NR::Point const &from, NR::Point const &to, double rounding);
95 static bool accumulate_calligraphic(SPDynaDrawContext *dc);
97 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
99 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
100 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
101 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
102 static void draw_temporary_box(SPDynaDrawContext *dc);
105 static SPEventContextClass *dd_parent_class = 0;
107 GType sp_dyna_draw_context_get_type(void)
108 {
109 static GType type = 0;
110 if (!type) {
111 GTypeInfo info = {
112 sizeof(SPDynaDrawContextClass),
113 0, // base_init
114 0, // base_finalize
115 (GClassInitFunc)sp_dyna_draw_context_class_init,
116 0, // class_finalize
117 0, // class_data
118 sizeof(SPDynaDrawContext),
119 0, // n_preallocs
120 (GInstanceInitFunc)sp_dyna_draw_context_init,
121 0 // value_table
122 };
123 type = g_type_register_static(SP_TYPE_COMMON_CONTEXT, "SPDynaDrawContext", &info, static_cast<GTypeFlags>(0));
124 }
125 return type;
126 }
128 static void
129 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
130 {
131 GObjectClass *object_class = (GObjectClass *) klass;
132 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
134 dd_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
136 object_class->dispose = sp_dyna_draw_context_dispose;
138 event_context_class->setup = sp_dyna_draw_context_setup;
139 event_context_class->set = sp_dyna_draw_context_set;
140 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
141 }
143 static void
144 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
145 {
146 ddc->cursor_shape = cursor_calligraphy_xpm;
147 ddc->hot_x = 4;
148 ddc->hot_y = 4;
150 ddc->vel_thin = 0.1;
151 ddc->flatness = 0.9;
152 ddc->cap_rounding = 0.0;
154 ddc->abs_width = false;
155 ddc->keep_selected = true;
157 ddc->hatch_spacing = 0;
158 ddc->hatch_spacing_step = 0;
159 new (&ddc->hatch_pointer_past) std::list<double>();
160 new (&ddc->hatch_nearest_past) std::list<double>();
161 ddc->hatch_last_nearest = NR::Point(0,0);
162 ddc->hatch_last_pointer = NR::Point(0,0);
163 ddc->hatch_vector_accumulated = NR::Point(0,0);
164 ddc->hatch_escaped = false;
165 ddc->hatch_area = NULL;
166 ddc->hatch_item = NULL;
167 ddc->hatch_livarot_path = NULL;
169 ddc->trace_bg = false;
170 }
172 static void
173 sp_dyna_draw_context_dispose(GObject *object)
174 {
175 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
177 if (ddc->hatch_area) {
178 gtk_object_destroy(GTK_OBJECT(ddc->hatch_area));
179 ddc->hatch_area = NULL;
180 }
183 G_OBJECT_CLASS(dd_parent_class)->dispose(object);
185 ddc->hatch_pointer_past.~list();
186 ddc->hatch_nearest_past.~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;
242 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
244 if (prefs_get_int_attribute("tools.calligraphic", "selcue", 0) != 0) {
245 ec->enableSelectionCue();
246 }
247 }
249 static void
250 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
251 {
252 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
254 if (!strcmp(key, "tracebackground")) {
255 ddc->trace_bg = (val && strcmp(val, "0"));
256 } else if (!strcmp(key, "keep_selected")) {
257 ddc->keep_selected = (val && strcmp(val, "0"));
258 } else {
259 //pass on up to parent class to handle common attributes.
260 if ( dd_parent_class->set ) {
261 dd_parent_class->set(ec, key, val);
262 }
263 }
265 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
266 }
268 static double
269 flerp(double f0, double f1, double p)
270 {
271 return f0 + ( f1 - f0 ) * p;
272 }
274 /* Get normalized point */
275 static NR::Point
276 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
277 {
278 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
279 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
280 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
281 }
283 /* Get view point */
284 static NR::Point
285 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
286 {
287 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
288 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
289 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
290 }
292 static void
293 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
294 {
295 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
296 dc->vel = NR::Point(0,0);
297 dc->vel_max = 0;
298 dc->acc = NR::Point(0,0);
299 dc->ang = NR::Point(0,0);
300 dc->del = NR::Point(0,0);
301 }
303 static void
304 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
305 {
306 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
307 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
308 else
309 dc->pressure = DDC_DEFAULT_PRESSURE;
311 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
312 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
313 else
314 dc->xtilt = DDC_DEFAULT_TILT;
316 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
317 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
318 else
319 dc->ytilt = DDC_DEFAULT_TILT;
320 }
323 static gboolean
324 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
325 {
326 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
328 /* Calculate mass and drag */
329 double const mass = flerp(1.0, 160.0, dc->mass);
330 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
332 /* Calculate force and acceleration */
333 NR::Point force = n - dc->cur;
335 // If force is below the absolute threshold DYNA_EPSILON,
336 // or we haven't yet reached DYNA_VEL_START (i.e. at the beginning of stroke)
337 // _and_ the force is below the (higher) DYNA_EPSILON_START threshold,
338 // discard this move.
339 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
340 // especially bothersome at the start of the stroke where we don't yet have the inertia to
341 // smooth them out.
342 if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
343 return FALSE;
344 }
346 dc->acc = force / mass;
348 /* Calculate new velocity */
349 dc->vel += dc->acc;
351 if (NR::L2(dc->vel) > dc->vel_max)
352 dc->vel_max = NR::L2(dc->vel);
354 /* Calculate angle of drawing tool */
356 double a1;
357 if (dc->usetilt) {
358 // 1a. calculate nib angle from input device tilt:
359 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
361 if (length > 0) {
362 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
363 a1 = atan2(ang1);
364 }
365 else
366 a1 = 0.0;
367 }
368 else {
369 // 1b. fixed dc->angle (absolutely flat nib):
370 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
371 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
372 a1 = atan2(ang1);
373 }
375 // 2. perpendicular to dc->vel (absolutely non-flat nib):
376 gdouble const mag_vel = NR::L2(dc->vel);
377 if ( mag_vel < DYNA_EPSILON ) {
378 return FALSE;
379 }
380 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
382 // 3. Average them using flatness parameter:
383 // calculate angles
384 double a2 = atan2(ang2);
385 // flip a2 to force it to be in the same half-circle as a1
386 bool flipped = false;
387 if (fabs (a2-a1) > 0.5*M_PI) {
388 a2 += M_PI;
389 flipped = true;
390 }
391 // normalize a2
392 if (a2 > M_PI)
393 a2 -= 2*M_PI;
394 if (a2 < -M_PI)
395 a2 += 2*M_PI;
396 // find the flatness-weighted bisector angle, unflip if a2 was flipped
397 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
398 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
400 // Try to detect a sudden flip when the new angle differs too much from the previous for the
401 // current velocity; in that case discard this move
402 double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
403 if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
404 return FALSE;
405 }
407 // convert to point
408 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
410 // 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);
412 /* Apply drag */
413 dc->vel *= 1.0 - drag;
415 /* Update position */
416 dc->last = dc->cur;
417 dc->cur += dc->vel;
419 return TRUE;
420 }
422 static void
423 sp_dyna_draw_brush(SPDynaDrawContext *dc)
424 {
425 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
427 // How much velocity thins strokestyle
428 double vel_thin = flerp (0, 160, dc->vel_thin);
430 // Influence of pressure on thickness
431 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
433 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
434 // drag)
435 NR::Point brush = sp_dyna_draw_get_vpoint(dc, dc->cur);
436 NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
438 double trace_thick = 1;
439 if (dc->trace_bg) {
440 // pick single pixel
441 NRPixBlock pb;
442 int x = (int) floor(brush_w[NR::X]);
443 int y = (int) floor(brush_w[NR::Y]);
444 nr_pixblock_setup_fast(&pb, NR_PIXBLOCK_MODE_R8G8B8A8P, x, y, x+1, y+1, TRUE);
445 sp_canvas_arena_render_pixblock(SP_CANVAS_ARENA(sp_desktop_drawing(SP_EVENT_CONTEXT(dc)->desktop)), &pb);
446 const unsigned char *s = NR_PIXBLOCK_PX(&pb);
447 double R = s[0] / 255.0;
448 double G = s[1] / 255.0;
449 double B = s[2] / 255.0;
450 double A = s[3] / 255.0;
451 double max = MAX (MAX (R, G), B);
452 double min = MIN (MIN (R, G), B);
453 double L = A * (max + min)/2 + (1 - A); // blend with white bg
454 trace_thick = 1 - L;
455 //g_print ("L %g thick %g\n", L, trace_thick);
456 }
458 double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
460 double tremble_left = 0, tremble_right = 0;
461 if (dc->tremor > 0) {
462 // obtain two normally distributed random variables, using polar Box-Muller transform
463 double x1, x2, w, y1, y2;
464 do {
465 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
466 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
467 w = x1 * x1 + x2 * x2;
468 } while ( w >= 1.0 );
469 w = sqrt( (-2.0 * log( w ) ) / w );
470 y1 = x1 * w;
471 y2 = x2 * w;
473 // deflect both left and right edges randomly and independently, so that:
474 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
475 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
476 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
477 // comparatively smooth and slow ones excessively jittery
478 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
479 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
480 }
482 if ( width < 0.02 * dc->width ) {
483 width = 0.02 * dc->width;
484 }
486 double dezoomify_factor = 0.05 * 1000;
487 if (!dc->abs_width) {
488 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
489 }
491 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
492 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
494 dc->point1[dc->npoints] = brush + del_left;
495 dc->point2[dc->npoints] = brush - del_right;
497 dc->del = 0.5*(del_left + del_right);
499 dc->npoints++;
500 }
502 void
503 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
504 {
505 desktop->setToolboxAdjustmentValue (id, value);
506 }
508 static void
509 calligraphic_cancel(SPDynaDrawContext *dc)
510 {
511 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
512 dc->dragging = FALSE;
513 dc->is_drawing = false;
514 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
515 /* Remove all temporary line segments */
516 while (dc->segments) {
517 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
518 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
519 }
520 /* reset accumulated curve */
521 dc->accumulated->reset();
522 clear_current(dc);
523 if (dc->repr) {
524 dc->repr = NULL;
525 }
526 }
529 gint
530 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
531 GdkEvent *event)
532 {
533 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
534 SPDesktop *desktop = event_context->desktop;
536 gint ret = FALSE;
538 switch (event->type) {
539 case GDK_BUTTON_PRESS:
540 if (event->button.button == 1 && !event_context->space_panning) {
542 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
544 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
545 return TRUE;
546 }
548 NR::Point const button_w(event->button.x,
549 event->button.y);
550 NR::Point const button_dt(desktop->w2d(button_w));
551 sp_dyna_draw_reset(dc, button_dt);
552 sp_dyna_draw_extinput(dc, event);
553 sp_dyna_draw_apply(dc, button_dt);
554 dc->accumulated->reset();
555 if (dc->repr) {
556 dc->repr = NULL;
557 }
559 /* initialize first point */
560 dc->npoints = 0;
562 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
563 ( GDK_KEY_PRESS_MASK |
564 GDK_BUTTON_RELEASE_MASK |
565 GDK_POINTER_MOTION_MASK |
566 GDK_BUTTON_PRESS_MASK ),
567 NULL,
568 event->button.time);
570 ret = TRUE;
572 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
573 dc->is_drawing = true;
574 }
575 break;
576 case GDK_MOTION_NOTIFY:
577 {
578 NR::Point const motion_w(event->motion.x,
579 event->motion.y);
580 NR::Point motion_dt(desktop->w2d(motion_w));
581 sp_dyna_draw_extinput(dc, event);
583 dc->_message_context->clear();
585 // for hatching:
586 double hatch_dist = 0;
587 NR::Point hatch_unit_vector(0,0);
588 NR::Point nearest(0,0);
589 NR::Point pointer(0,0);
590 NR::Matrix motion_to_curve(NR::identity());
592 if (event->motion.state & GDK_CONTROL_MASK) { // hatching - sense the item
594 SPItem *selected = sp_desktop_selection(desktop)->singleItem();
595 if (selected && (SP_IS_SHAPE(selected) || SP_IS_TEXT(selected))) {
596 // One item selected, and it's a path;
597 // let's try to track it as a guide
599 if (selected != dc->hatch_item) {
600 dc->hatch_item = selected;
601 if (dc->hatch_livarot_path)
602 delete dc->hatch_livarot_path;
603 dc->hatch_livarot_path = Path_for_item (dc->hatch_item, true, true);
604 dc->hatch_livarot_path->ConvertWithBackData(0.01);
605 }
607 // calculate pointer point in the guide item's coords
608 motion_to_curve = from_2geom(sp_item_dt2i_affine(selected) * sp_item_i2doc_affine(selected));
609 pointer = motion_dt * motion_to_curve;
611 // calculate the nearest point on the guide path
612 NR::Maybe<Path::cut_position> position = get_nearest_position_on_Path(dc->hatch_livarot_path, pointer);
613 nearest = get_point_on_Path(dc->hatch_livarot_path, position->piece, position->t);
616 // distance from pointer to nearest
617 hatch_dist = NR::L2(pointer - nearest);
618 // unit-length vector
619 hatch_unit_vector = (pointer - nearest)/hatch_dist;
621 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Guide path selected</b>; start drawing along the guide with <b>Ctrl</b>"));
622 } else {
623 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Select a guide path</b> to track with <b>Ctrl</b>"));
624 }
625 }
627 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
628 dc->dragging = TRUE;
630 if (event->motion.state & GDK_CONTROL_MASK && dc->hatch_item) { // hatching
632 #define SPEED_ELEMENTS 12
633 #define SPEED_MIN 0.12
634 #define SPEED_NORMAL 0.65
636 // speed is the movement of the nearest point along the guide path, divided by
637 // the movement of the pointer at the same period; it is averaged for the last
638 // SPEED_ELEMENTS motion events. Normally, as you track the guide path, speed
639 // is about 1, i.e. the nearest point on the path is moved by about the same
640 // distance as the pointer. If the speed starts to decrease, we are losing
641 // contact with the guide; if it drops below SPEED_MIN, we are on our own and
642 // not attracted to guide anymore. Most often this happens when you have
643 // tracked to the end of a guide calligraphic stroke and keep moving
644 // further. We try to handle this situation gracefully: not stick with the
645 // guide forever but let go of it smoothly and without sharp jerks (non-zero
646 // mass recommended; with zero mass, jerks are still quite noticeable).
648 double speed = 1;
649 if (NR::L2(dc->hatch_last_nearest) != 0) {
650 // the distance nearest moved since the last motion event
651 double nearest_moved = NR::L2(nearest - dc->hatch_last_nearest);
652 // the distance pointer moved since the last motion event
653 double pointer_moved = NR::L2(pointer - dc->hatch_last_pointer);
654 // store them in stacks limited to SPEED_ELEMENTS
655 dc->hatch_nearest_past.push_front(nearest_moved);
656 if (dc->hatch_nearest_past.size() > SPEED_ELEMENTS)
657 dc->hatch_nearest_past.pop_back();
658 dc->hatch_pointer_past.push_front(pointer_moved);
659 if (dc->hatch_pointer_past.size() > SPEED_ELEMENTS)
660 dc->hatch_pointer_past.pop_back();
662 // If the stacks are full,
663 if (dc->hatch_nearest_past.size() == SPEED_ELEMENTS) {
664 // calculate the sums of all stored movements
665 double nearest_sum = std::accumulate (dc->hatch_nearest_past.begin(), dc->hatch_nearest_past.end(), 0.0);
666 double pointer_sum = std::accumulate (dc->hatch_pointer_past.begin(), dc->hatch_pointer_past.end(), 0.0);
667 // and divide to get the speed
668 speed = nearest_sum/pointer_sum;
669 //g_print ("nearest sum %g pointer_sum %g speed %g\n", nearest_sum, pointer_sum, speed);
670 }
671 }
673 if ( dc->hatch_escaped // already escaped, do not reattach
674 || (speed < SPEED_MIN) // stuck; most likely reached end of traced stroke
675 || (dc->hatch_spacing > 0 && hatch_dist > 50 * dc->hatch_spacing) // went too far from the guide
676 ) {
677 // We are NOT attracted to the guide!
679 //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);
681 // Remember hatch_escaped so we don't get
682 // attracted again until the end of this stroke
683 dc->hatch_escaped = true;
685 } else {
687 // Calculate angle cosine of this vector-to-guide and all past vectors
688 // summed, to detect if we accidentally flipped to the other side of the
689 // guide
690 double dot = NR::dot (pointer - nearest, dc->hatch_vector_accumulated);
691 dot /= NR::L2(pointer - nearest) * NR::L2(dc->hatch_vector_accumulated);
693 if (dc->hatch_spacing != 0) { // spacing was already set
694 double target;
695 if (speed > SPEED_NORMAL) {
696 // all ok, strictly obey the spacing
697 target = dc->hatch_spacing;
698 } else {
699 // looks like we're starting to lose speed,
700 // so _gradually_ let go attraction to prevent jerks
701 target = (dc->hatch_spacing * speed + hatch_dist * (SPEED_NORMAL - speed))/SPEED_NORMAL;
702 }
703 if (!IS_NAN(dot) && dot < -0.5) {// flip
704 target = -target;
705 }
707 // This is the track pointer that we will use instead of the real one
708 NR::Point new_pointer = nearest + target * hatch_unit_vector;
710 // some limited feedback: allow persistent pulling to slightly change
711 // the spacing
712 dc->hatch_spacing += (hatch_dist - dc->hatch_spacing)/3500;
714 // return it to the desktop coords
715 motion_dt = new_pointer * motion_to_curve.inverse();
717 } else {
718 // this is the first motion event, set the dist
719 dc->hatch_spacing = hatch_dist;
720 }
722 // remember last points
723 dc->hatch_last_pointer = pointer;
724 dc->hatch_last_nearest = nearest;
725 dc->hatch_vector_accumulated += (pointer - nearest);
726 }
728 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, dc->hatch_escaped? _("Tracking: <b>connection to guide path lost!</b>") : _("<b>Tracking</b> a guide path"));
730 } else {
731 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a calligraphic stroke"));
732 }
734 if (!sp_dyna_draw_apply(dc, motion_dt)) {
735 ret = TRUE;
736 break;
737 }
739 if ( dc->cur != dc->last ) {
740 sp_dyna_draw_brush(dc);
741 g_assert( dc->npoints > 0 );
742 fit_and_split(dc, FALSE);
743 }
744 ret = TRUE;
745 }
747 // Draw the hatching circle if necessary
748 if (event->motion.state & GDK_CONTROL_MASK) {
749 if (dc->hatch_spacing == 0 && hatch_dist != 0) {
750 // Haven't set spacing yet: gray, center free, update radius live
751 NR::Point c = desktop->w2d(motion_w);
752 NR::Matrix const sm (NR::scale(hatch_dist, hatch_dist) * NR::translate(c));
753 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
754 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
755 sp_canvas_item_show(dc->hatch_area);
756 } else if (dc->dragging && !dc->hatch_escaped) {
757 // Tracking: green, center snapped, fixed radius
758 NR::Point c = motion_dt;
759 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
760 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
761 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x00FF00ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
762 sp_canvas_item_show(dc->hatch_area);
763 } else if (dc->dragging && dc->hatch_escaped) {
764 // Tracking escaped: red, center free, fixed radius
765 NR::Point c = desktop->w2d(motion_w);
766 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
768 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
769 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0xFF0000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
770 sp_canvas_item_show(dc->hatch_area);
771 } else {
772 // Not drawing but spacing set: gray, center snapped, fixed radius
773 NR::Point c = (nearest + dc->hatch_spacing * hatch_unit_vector) * motion_to_curve.inverse();
774 if (!IS_NAN(c[NR::X]) && !IS_NAN(c[NR::Y])) {
775 NR::Matrix const sm (NR::scale(dc->hatch_spacing, dc->hatch_spacing) * NR::translate(c));
776 sp_canvas_item_affine_absolute(dc->hatch_area, sm);
777 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(dc->hatch_area), 0x7f7f7fff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
778 sp_canvas_item_show(dc->hatch_area);
779 }
780 }
781 } else {
782 sp_canvas_item_hide(dc->hatch_area);
783 }
784 }
785 break;
788 case GDK_BUTTON_RELEASE:
789 {
790 NR::Point const motion_w(event->button.x, event->button.y);
791 NR::Point const motion_dt(desktop->w2d(motion_w));
793 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
794 sp_canvas_end_forced_full_redraws(desktop->canvas);
795 dc->is_drawing = false;
797 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
798 dc->dragging = FALSE;
800 sp_dyna_draw_apply(dc, motion_dt);
802 /* Remove all temporary line segments */
803 while (dc->segments) {
804 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
805 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
806 }
808 /* Create object */
809 fit_and_split(dc, TRUE);
810 if (accumulate_calligraphic(dc))
811 set_to_accumulated(dc, event->button.state & GDK_SHIFT_MASK); // performs document_done
812 else
813 g_warning ("Failed to create path: invalid data in dc->cal1 or dc->cal2");
815 /* reset accumulated curve */
816 dc->accumulated->reset();
818 clear_current(dc);
819 if (dc->repr) {
820 dc->repr = NULL;
821 }
823 if (!dc->hatch_pointer_past.empty()) dc->hatch_pointer_past.clear();
824 if (!dc->hatch_nearest_past.empty()) dc->hatch_nearest_past.clear();
825 dc->hatch_last_nearest = NR::Point(0,0);
826 dc->hatch_last_pointer = NR::Point(0,0);
827 dc->hatch_vector_accumulated = NR::Point(0,0);
828 dc->hatch_escaped = false;
829 dc->hatch_item = NULL;
830 dc->hatch_livarot_path = NULL;
832 if (dc->hatch_spacing != 0 && !dc->keep_selected) {
833 // we do not select the newly drawn path, so increase spacing by step
834 if (dc->hatch_spacing_step == 0) {
835 dc->hatch_spacing_step = dc->hatch_spacing;
836 }
837 dc->hatch_spacing += dc->hatch_spacing_step;
838 }
840 dc->_message_context->clear();
841 ret = TRUE;
842 }
843 break;
844 }
846 case GDK_KEY_PRESS:
847 switch (get_group0_keyval (&event->key)) {
848 case GDK_Up:
849 case GDK_KP_Up:
850 if (!MOD__CTRL_ONLY) {
851 dc->angle += 5.0;
852 if (dc->angle > 90.0)
853 dc->angle = 90.0;
854 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
855 ret = TRUE;
856 }
857 break;
858 case GDK_Down:
859 case GDK_KP_Down:
860 if (!MOD__CTRL_ONLY) {
861 dc->angle -= 5.0;
862 if (dc->angle < -90.0)
863 dc->angle = -90.0;
864 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
865 ret = TRUE;
866 }
867 break;
868 case GDK_Right:
869 case GDK_KP_Right:
870 if (!MOD__CTRL_ONLY) {
871 dc->width += 0.01;
872 if (dc->width > 1.0)
873 dc->width = 1.0;
874 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
875 ret = TRUE;
876 }
877 break;
878 case GDK_Left:
879 case GDK_KP_Left:
880 if (!MOD__CTRL_ONLY) {
881 dc->width -= 0.01;
882 if (dc->width < 0.01)
883 dc->width = 0.01;
884 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
885 ret = TRUE;
886 }
887 break;
888 case GDK_Home:
889 case GDK_KP_Home:
890 dc->width = 0.01;
891 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
892 ret = TRUE;
893 break;
894 case GDK_End:
895 case GDK_KP_End:
896 dc->width = 1.0;
897 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
898 ret = TRUE;
899 break;
900 case GDK_x:
901 case GDK_X:
902 if (MOD__ALT_ONLY) {
903 desktop->setToolboxFocusTo ("altx-calligraphy");
904 ret = TRUE;
905 }
906 break;
907 case GDK_Escape:
908 if (dc->is_drawing) {
909 // if drawing, cancel, otherwise pass it up for deselecting
910 calligraphic_cancel (dc);
911 ret = TRUE;
912 }
913 break;
914 case GDK_z:
915 case GDK_Z:
916 if (MOD__CTRL_ONLY && dc->is_drawing) {
917 // if drawing, cancel, otherwise pass it up for undo
918 calligraphic_cancel (dc);
919 ret = TRUE;
920 }
921 break;
922 default:
923 break;
924 }
925 break;
927 case GDK_KEY_RELEASE:
928 switch (get_group0_keyval(&event->key)) {
929 case GDK_Control_L:
930 case GDK_Control_R:
931 dc->_message_context->clear();
932 dc->hatch_spacing = 0;
933 dc->hatch_spacing_step = 0;
934 break;
935 default:
936 break;
937 }
939 default:
940 break;
941 }
943 if (!ret) {
944 if (((SPEventContextClass *) dd_parent_class)->root_handler) {
945 ret = ((SPEventContextClass *) dd_parent_class)->root_handler(event_context, event);
946 }
947 }
949 return ret;
950 }
953 static void
954 clear_current(SPDynaDrawContext *dc)
955 {
956 /* reset bpath */
957 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
958 /* reset curve */
959 dc->currentcurve->reset();
960 dc->cal1->reset();
961 dc->cal2->reset();
962 /* reset points */
963 dc->npoints = 0;
964 }
966 static void
967 set_to_accumulated(SPDynaDrawContext *dc, bool unionize)
968 {
969 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
971 if (!dc->accumulated->is_empty()) {
972 if (!dc->repr) {
973 /* Create object */
974 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
975 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
977 /* Set style */
978 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
980 dc->repr = repr;
982 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
983 Inkscape::GC::release(dc->repr);
984 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
985 item->updateRepr();
986 }
987 Geom::PathVector pathv = dc->accumulated->get_pathvector() * to_2geom(sp_desktop_dt2root_affine(desktop));
988 gchar *str = sp_svg_write_path(pathv);
989 g_assert( str != NULL );
990 dc->repr->setAttribute("d", str);
991 g_free(str);
993 if (unionize) {
994 sp_desktop_selection(desktop)->add(dc->repr);
995 sp_selected_path_union_skip_undo();
996 } else {
997 if (dc->keep_selected) {
998 sp_desktop_selection(desktop)->set(dc->repr);
999 }
1000 }
1002 } else {
1003 if (dc->repr) {
1004 sp_repr_unparent(dc->repr);
1005 }
1006 dc->repr = NULL;
1007 }
1009 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
1010 _("Draw calligraphic stroke"));
1011 }
1013 static void
1014 add_cap(SPCurve *curve,
1015 NR::Point const &from,
1016 NR::Point const &to,
1017 double rounding)
1018 {
1019 if (NR::L2( to - from ) > DYNA_EPSILON) {
1020 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
1021 double mag = NR::L2(vel);
1023 NR::Point v = mag * NR::rot90( to - from ) / NR::L2( to - from );
1024 curve->curveto(to_2geom(from + v), to_2geom(to + v), to_2geom(to));
1025 }
1026 }
1028 static bool
1029 accumulate_calligraphic(SPDynaDrawContext *dc)
1030 {
1031 if (
1032 dc->cal1->is_empty() ||
1033 dc->cal2->is_empty() ||
1034 (dc->cal1->get_segment_count() <= 0) ||
1035 dc->cal1->first_path()->closed()
1036 ) {
1037 dc->cal1->reset();
1038 dc->cal2->reset();
1039 return false; // failure
1040 }
1042 SPCurve *rev_cal2 = dc->cal2->create_reverse();
1043 if (
1044 (rev_cal2->get_segment_count() <= 0) ||
1045 rev_cal2->first_path()->closed()
1046 ) {
1047 rev_cal2->unref();
1048 dc->cal1->reset();
1049 dc->cal2->reset();
1050 return false; // failure
1051 }
1053 Geom::CubicBezier const * dc_cal1_firstseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->first_segment() );
1054 Geom::CubicBezier const * rev_cal2_firstseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->first_segment() );
1055 Geom::CubicBezier const * dc_cal1_lastseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->last_segment() );
1056 Geom::CubicBezier const * rev_cal2_lastseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->last_segment() );
1058 if (
1059 !dc_cal1_firstseg ||
1060 !rev_cal2_firstseg ||
1061 !dc_cal1_lastseg ||
1062 !rev_cal2_lastseg
1063 ) {
1064 rev_cal2->unref();
1065 dc->cal1->reset();
1066 dc->cal2->reset();
1067 return false; // failure
1068 }
1070 dc->accumulated->reset(); /* Is this required ?? */
1072 dc->accumulated->append(dc->cal1, false);
1074 add_cap(dc->accumulated, (*dc_cal1_lastseg)[3], (*rev_cal2_firstseg)[0], dc->cap_rounding);
1076 dc->accumulated->append(rev_cal2, true);
1078 add_cap(dc->accumulated, (*rev_cal2_lastseg)[3], (*dc_cal1_firstseg)[0], dc->cap_rounding);
1080 dc->accumulated->closepath();
1082 rev_cal2->unref();
1084 dc->cal1->reset();
1085 dc->cal2->reset();
1087 return true; // success
1088 }
1090 static double square(double const x)
1091 {
1092 return x * x;
1093 }
1095 static void
1096 fit_and_split(SPDynaDrawContext *dc, gboolean release)
1097 {
1098 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
1100 #ifdef DYNA_DRAW_VERBOSE
1101 g_print("[F&S:R=%c]", release?'T':'F');
1102 #endif
1104 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
1105 return; // just clicked
1107 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
1108 #define BEZIER_SIZE 4
1109 #define BEZIER_MAX_BEZIERS 8
1110 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
1112 #ifdef DYNA_DRAW_VERBOSE
1113 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
1114 dc->npoints, release ? "TRUE" : "FALSE");
1115 #endif
1117 /* Current calligraphic */
1118 if ( dc->cal1->is_empty() || dc->cal2->is_empty() ) {
1119 /* dc->npoints > 0 */
1120 /* g_print("calligraphics(1|2) reset\n"); */
1121 dc->cal1->reset();
1122 dc->cal2->reset();
1124 dc->cal1->moveto(to_2geom(dc->point1[0]));
1125 dc->cal2->moveto(to_2geom(dc->point2[0]));
1126 }
1128 NR::Point b1[BEZIER_MAX_LENGTH];
1129 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1130 tolerance_sq, BEZIER_MAX_BEZIERS);
1131 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1133 NR::Point b2[BEZIER_MAX_LENGTH];
1134 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1135 tolerance_sq, BEZIER_MAX_BEZIERS);
1136 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1138 if ( nb1 != -1 && nb2 != -1 ) {
1139 /* Fit and draw and reset state */
1140 #ifdef DYNA_DRAW_VERBOSE
1141 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1142 #endif
1143 /* CanvasShape */
1144 if (! release) {
1145 dc->currentcurve->reset();
1146 dc->currentcurve->moveto(to_2geom(b1[0]));
1147 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1148 dc->currentcurve->curveto(to_2geom(bp1[1]), to_2geom(bp1[2]), to_2geom(bp1[3]));
1149 }
1150 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
1151 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1152 dc->currentcurve->curveto(to_2geom(bp2[2]), to_2geom(bp2[1]), to_2geom(bp2[0]));
1153 }
1154 // FIXME: dc->segments is always NULL at this point??
1155 if (!dc->segments) { // first segment
1156 add_cap(dc->currentcurve, b2[0], b1[0], dc->cap_rounding);
1157 }
1158 dc->currentcurve->closepath();
1159 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1160 }
1162 /* Current calligraphic */
1163 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1164 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
1165 }
1166 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1167 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
1168 }
1169 } else {
1170 /* fixme: ??? */
1171 #ifdef DYNA_DRAW_VERBOSE
1172 g_print("[fit_and_split] failed to fit-cubic.\n");
1173 #endif
1174 draw_temporary_box(dc);
1176 for (gint i = 1; i < dc->npoints; i++) {
1177 dc->cal1->lineto(dc->point1[i]);
1178 }
1179 for (gint i = 1; i < dc->npoints; i++) {
1180 dc->cal2->lineto(dc->point2[i]);
1181 }
1182 }
1184 /* Fit and draw and copy last point */
1185 #ifdef DYNA_DRAW_VERBOSE
1186 g_print("[%d]Yup\n", dc->npoints);
1187 #endif
1188 if (!release) {
1189 g_assert(!dc->currentcurve->is_empty());
1191 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1192 SP_TYPE_CANVAS_BPATH,
1193 NULL);
1194 SPCurve *curve = dc->currentcurve->copy();
1195 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1196 curve->unref();
1198 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1199 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1200 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
1201 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
1202 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
1203 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1204 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1205 //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);
1206 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1207 /* fixme: Cannot we cascade it to root more clearly? */
1208 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1210 dc->segments = g_slist_prepend(dc->segments, cbp);
1211 }
1213 dc->point1[0] = dc->point1[dc->npoints - 1];
1214 dc->point2[0] = dc->point2[dc->npoints - 1];
1215 dc->npoints = 1;
1216 } else {
1217 draw_temporary_box(dc);
1218 }
1219 }
1221 static void
1222 draw_temporary_box(SPDynaDrawContext *dc)
1223 {
1224 dc->currentcurve->reset();
1226 dc->currentcurve->moveto(dc->point2[dc->npoints-1]);
1227 for (gint i = dc->npoints-2; i >= 0; i--) {
1228 dc->currentcurve->lineto(dc->point2[i]);
1229 }
1230 for (gint i = 0; i < dc->npoints; i++) {
1231 dc->currentcurve->lineto(dc->point1[i]);
1232 }
1234 if (dc->npoints >= 2) {
1235 add_cap(dc->currentcurve, dc->point1[dc->npoints-1], dc->point2[dc->npoints-1], dc->cap_rounding);
1236 }
1238 dc->currentcurve->closepath();
1239 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1240 }
1242 /*
1243 Local Variables:
1244 mode:c++
1245 c-file-style:"stroustrup"
1246 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1247 indent-tabs-mode:nil
1248 fill-column:99
1249 End:
1250 */
1251 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :