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