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