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"
49 #define DDC_RED_RGBA 0xff0000ff
51 #define SAMPLE_TIMEOUT 10
52 #define TOLERANCE_LINE 1.0
53 #define TOLERANCE_CALLIGRAPHIC 3.0
54 #define DYNA_EPSILON 1.0e-6
56 #define DYNA_MIN_WIDTH 1.0e-6
58 #define DRAG_MIN 0.0
59 #define DRAG_DEFAULT 1.0
60 #define DRAG_MAX 1.0
62 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
63 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
64 static void sp_dyna_draw_context_dispose(GObject *object);
66 static void sp_dyna_draw_context_setup(SPEventContext *ec);
67 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
68 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
70 static void clear_current(SPDynaDrawContext *dc);
71 static void set_to_accumulated(SPDynaDrawContext *dc);
72 static void accumulate_calligraphic(SPDynaDrawContext *dc);
74 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
75 static void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release);
77 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
78 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
79 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
80 static void draw_temporary_box(SPDynaDrawContext *dc);
83 static SPEventContextClass *parent_class;
85 GtkType
86 sp_dyna_draw_context_get_type(void)
87 {
88 static GType type = 0;
89 if (!type) {
90 GTypeInfo info = {
91 sizeof(SPDynaDrawContextClass),
92 NULL, NULL,
93 (GClassInitFunc) sp_dyna_draw_context_class_init,
94 NULL, NULL,
95 sizeof(SPDynaDrawContext),
96 4,
97 (GInstanceInitFunc) sp_dyna_draw_context_init,
98 NULL, /* value_table */
99 };
100 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
101 }
102 return type;
103 }
105 static void
106 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
107 {
108 GObjectClass *object_class = (GObjectClass *) klass;
109 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
111 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
113 object_class->dispose = sp_dyna_draw_context_dispose;
115 event_context_class->setup = sp_dyna_draw_context_setup;
116 event_context_class->set = sp_dyna_draw_context_set;
117 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
118 }
120 static void
121 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
122 {
123 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
125 event_context->cursor_shape = cursor_calligraphy_xpm;
126 event_context->hot_x = 4;
127 event_context->hot_y = 4;
129 ddc->accumulated = NULL;
130 ddc->segments = NULL;
131 ddc->currentcurve = NULL;
132 ddc->currentshape = NULL;
133 ddc->npoints = 0;
134 ddc->cal1 = NULL;
135 ddc->cal2 = NULL;
136 ddc->repr = NULL;
138 /* DynaDraw values */
139 ddc->cur = NR::Point(0,0);
140 ddc->last = NR::Point(0,0);
141 ddc->vel = NR::Point(0,0);
142 ddc->acc = NR::Point(0,0);
143 ddc->ang = NR::Point(0,0);
144 ddc->del = NR::Point(0,0);
146 /* attributes */
147 ddc->use_timeout = FALSE;
148 ddc->timer_id = 0;
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;
158 }
160 static void
161 sp_dyna_draw_context_dispose(GObject *object)
162 {
163 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
165 if (ddc->accumulated) {
166 ddc->accumulated = sp_curve_unref(ddc->accumulated);
167 }
169 while (ddc->segments) {
170 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
171 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
172 }
174 if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
175 if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
176 if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
178 if (ddc->currentshape) {
179 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
180 ddc->currentshape = NULL;
181 }
183 if (ddc->_message_context) {
184 delete ddc->_message_context;
185 }
187 G_OBJECT_CLASS(parent_class)->dispose(object);
188 }
190 static void
191 sp_dyna_draw_context_setup(SPEventContext *ec)
192 {
193 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
195 if (((SPEventContextClass *) parent_class)->setup)
196 ((SPEventContextClass *) parent_class)->setup(ec);
198 ddc->accumulated = sp_curve_new_sized(32);
199 ddc->currentcurve = sp_curve_new_sized(4);
201 ddc->cal1 = sp_curve_new_sized(32);
202 ddc->cal2 = sp_curve_new_sized(32);
204 ddc->currentshape = sp_canvas_item_new(SP_DT_SKETCH(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
205 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
206 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
207 /* fixme: Cannot we cascade it to root more clearly? */
208 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
210 sp_event_context_read(ec, "mass");
211 sp_event_context_read(ec, "drag");
212 sp_event_context_read(ec, "angle");
213 sp_event_context_read(ec, "width");
214 sp_event_context_read(ec, "thinning");
215 sp_event_context_read(ec, "tremor");
216 sp_event_context_read(ec, "flatness");
217 sp_event_context_read(ec, "usepressure");
218 sp_event_context_read(ec, "usetilt");
220 ddc->is_drawing = false;
222 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
223 }
225 static void
226 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
227 {
228 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
230 if (!strcmp(key, "mass")) {
231 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
232 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
233 } else if (!strcmp(key, "drag")) {
234 double const dval = ( val ? g_ascii_strtod (val, NULL) : DRAG_DEFAULT );
235 ddc->drag = CLAMP(dval, DRAG_MIN, DRAG_MAX);
236 } else if (!strcmp(key, "angle")) {
237 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
238 ddc->angle = CLAMP (dval, -90, 90);
239 } else if (!strcmp(key, "width")) {
240 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
241 ddc->width = CLAMP(dval, -1000.0, 1000.0);
242 } else if (!strcmp(key, "thinning")) {
243 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
244 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
245 } else if (!strcmp(key, "tremor")) {
246 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
247 ddc->tremor = CLAMP(dval, 0.0, 1.0);
248 } else if (!strcmp(key, "flatness")) {
249 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
250 ddc->flatness = CLAMP(dval, 0, 1.0);
251 } else if (!strcmp(key, "usepressure")) {
252 ddc->usepressure = (val && strcmp(val, "0"));
253 } else if (!strcmp(key, "usetilt")) {
254 ddc->usetilt = (val && strcmp(val, "0"));
255 }
257 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
258 }
260 static double
261 flerp(double f0, double f1, double p)
262 {
263 return f0 + ( f1 - f0 ) * p;
264 }
266 /* Get normalized point */
267 static NR::Point
268 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
269 {
270 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
271 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
272 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
273 }
275 /* Get view point */
276 static NR::Point
277 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
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(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
282 }
284 static void
285 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
286 {
287 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
288 dc->vel = NR::Point(0,0);
289 dc->acc = NR::Point(0,0);
290 dc->ang = NR::Point(0,0);
291 dc->del = NR::Point(0,0);
292 }
294 static void
295 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
296 {
297 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
298 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
299 else
300 dc->pressure = DDC_DEFAULT_PRESSURE;
302 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
303 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
304 else
305 dc->xtilt = DDC_DEFAULT_TILT;
307 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
308 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
309 else
310 dc->ytilt = DDC_DEFAULT_TILT;
311 }
314 static gboolean
315 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
316 {
317 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
319 /* Calculate mass and drag */
320 double const mass = flerp(1.0, 160.0, dc->mass);
321 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
323 /* Calculate force and acceleration */
324 NR::Point force = n - dc->cur;
325 if ( NR::L2(force) < DYNA_EPSILON ) {
326 return FALSE;
327 }
329 dc->acc = force / mass;
331 /* Calculate new velocity */
332 dc->vel += dc->acc;
334 /* Calculate angle of drawing tool */
336 double a1;
337 if (dc->usetilt) {
338 // 1a. calculate nib angle from input device tilt:
339 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
341 if (length > 0) {
342 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
343 a1 = atan2(ang1);
344 }
345 else
346 a1 = 0.0;
347 }
348 else {
349 // 1b. fixed dc->angle (absolutely flat nib):
350 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
351 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
352 a1 = atan2(ang1);
353 }
355 // 2. perpendicular to dc->vel (absolutely non-flat nib):
356 gdouble const mag_vel = NR::L2(dc->vel);
357 if ( mag_vel < DYNA_EPSILON ) {
358 return FALSE;
359 }
360 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
362 // 3. Average them using flatness parameter:
363 // calculate angles
364 double a2 = atan2(ang2);
365 // flip a2 to force it to be in the same half-circle as a1
366 bool flipped = false;
367 if (fabs (a2-a1) > 0.5*M_PI) {
368 a2 += M_PI;
369 flipped = true;
370 }
371 // normalize a2
372 if (a2 > M_PI)
373 a2 -= 2*M_PI;
374 if (a2 < -M_PI)
375 a2 += 2*M_PI;
376 // find the flatness-weighted bisector angle, unflip if a2 was flipped
377 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
378 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
379 // convert to point
380 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
382 /* Apply drag */
383 dc->vel *= 1.0 - drag;
385 /* Update position */
386 dc->last = dc->cur;
387 dc->cur += dc->vel;
389 return TRUE;
390 }
392 static void
393 sp_dyna_draw_brush(SPDynaDrawContext *dc)
394 {
395 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
397 // How much velocity thins strokestyle
398 double vel_thin = flerp (0, 160, dc->vel_thin);
400 // Influence of pressure on thickness
401 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
403 double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
405 double tremble_left = 0, tremble_right = 0;
406 if (dc->tremor > 0) {
407 // obtain two normally distributed random variables, using polar Box-Muller transform
408 double x1, x2, w, y1, y2;
409 do {
410 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
411 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
412 w = x1 * x1 + x2 * x2;
413 } while ( w >= 1.0 );
414 w = sqrt( (-2.0 * log( w ) ) / w );
415 y1 = x1 * w;
416 y2 = x2 * w;
418 // deflect both left and right edges randomly and independently, so that:
419 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
420 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
421 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
422 // comparatively smooth and slow ones excessively jittery
423 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
424 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
425 }
427 if ( width < 0.02 * dc->width ) {
428 width = 0.02 * dc->width;
429 }
431 NR::Point del_left = 0.05 * (width + tremble_left) * dc->ang;
432 NR::Point del_right = 0.05 * (width + tremble_right) * dc->ang;
434 dc->point1[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur + del_left);
435 dc->point2[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur - del_right);
437 dc->del = 0.5*(del_left + del_right);
439 dc->npoints++;
440 }
442 static gint
443 sp_dyna_draw_timeout_handler(gpointer data)
444 {
445 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(data);
446 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
447 SPCanvas *canvas = SP_CANVAS(SP_DT_CANVAS(desktop));
449 dc->dragging = TRUE;
451 int x, y;
452 gtk_widget_get_pointer(GTK_WIDGET(canvas), &x, &y);
453 NR::Point p = sp_canvas_window_to_world(canvas, NR::Point(x, y));
454 p = desktop->w2d(p);
455 if (! sp_dyna_draw_apply(dc, p)) {
456 return TRUE;
457 }
459 if ( dc->cur != dc->last ) {
460 sp_dyna_draw_brush(dc);
461 g_assert( dc->npoints > 0 );
462 fit_and_split(dc, FALSE);
463 }
465 return TRUE;
466 }
468 void
469 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
470 {
471 desktop->setToolboxAdjustmentValue (id, value);
472 }
474 gint
475 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
476 GdkEvent *event)
477 {
478 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
479 SPDesktop *desktop = event_context->desktop;
481 gint ret = FALSE;
483 switch (event->type) {
484 case GDK_BUTTON_PRESS:
485 if ( event->button.button == 1 ) {
487 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
489 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
490 return TRUE;
491 }
493 NR::Point const button_w(event->button.x,
494 event->button.y);
495 NR::Point const button_dt(desktop->w2d(button_w));
496 sp_dyna_draw_reset(dc, button_dt);
497 sp_dyna_draw_extinput(dc, event);
498 sp_dyna_draw_apply(dc, button_dt);
499 sp_curve_reset(dc->accumulated);
500 if (dc->repr) {
501 dc->repr = NULL;
502 }
504 /* initialize first point */
505 dc->npoints = 0;
507 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
508 ( dc->use_timeout
509 ? ( GDK_KEY_PRESS_MASK |
510 GDK_BUTTON_RELEASE_MASK |
511 GDK_BUTTON_PRESS_MASK )
512 : ( GDK_KEY_PRESS_MASK |
513 GDK_BUTTON_RELEASE_MASK |
514 GDK_POINTER_MOTION_MASK |
515 GDK_BUTTON_PRESS_MASK ) ),
516 NULL,
517 event->button.time);
519 if ( dc->use_timeout && !dc->timer_id ) {
520 dc->timer_id = gtk_timeout_add(SAMPLE_TIMEOUT, sp_dyna_draw_timeout_handler, dc);
521 }
522 ret = TRUE;
524 dc->is_drawing = true;
525 }
526 break;
527 case GDK_MOTION_NOTIFY:
528 if ( dc->is_drawing && !dc->use_timeout && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
529 dc->dragging = TRUE;
531 NR::Point const motion_w(event->motion.x,
532 event->motion.y);
533 NR::Point const motion_dt(desktop->w2d(motion_w));
535 sp_dyna_draw_extinput(dc, event);
536 if (!sp_dyna_draw_apply(dc, motion_dt)) {
537 ret = TRUE;
538 break;
539 }
541 if ( dc->cur != dc->last ) {
542 sp_dyna_draw_brush(dc);
543 g_assert( dc->npoints > 0 );
544 fit_and_split(dc, FALSE);
545 }
546 ret = TRUE;
547 }
548 break;
550 case GDK_BUTTON_RELEASE:
551 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
552 dc->is_drawing = false;
553 if ( event->button.button == 1
554 && dc->use_timeout
555 && dc->timer_id != 0 )
556 {
557 gtk_timeout_remove(dc->timer_id);
558 dc->timer_id = 0;
559 }
560 if ( dc->dragging && event->button.button == 1 ) {
561 dc->dragging = FALSE;
563 /* Remove all temporary line segments */
564 while (dc->segments) {
565 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
566 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
567 }
568 /* Create object */
569 fit_and_split(dc, TRUE);
570 accumulate_calligraphic(dc);
571 set_to_accumulated(dc); /* temporal implementation */
572 /* reset accumulated curve */
573 sp_curve_reset(dc->accumulated);
574 clear_current(dc);
575 if (dc->repr) {
576 dc->repr = NULL;
577 }
578 ret = TRUE;
579 }
580 break;
581 case GDK_KEY_PRESS:
582 switch (get_group0_keyval (&event->key)) {
583 case GDK_Up:
584 case GDK_KP_Up:
585 if (!MOD__CTRL_ONLY) {
586 dc->angle += 5.0;
587 if (dc->angle > 90.0)
588 dc->angle = 90.0;
589 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
590 ret = TRUE;
591 }
592 break;
593 case GDK_Down:
594 case GDK_KP_Down:
595 if (!MOD__CTRL_ONLY) {
596 dc->angle -= 5.0;
597 if (dc->angle < -90.0)
598 dc->angle = -90.0;
599 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
600 ret = TRUE;
601 }
602 break;
603 case GDK_Right:
604 case GDK_KP_Right:
605 if (!MOD__CTRL_ONLY) {
606 dc->width += 0.01;
607 if (dc->width > 1.0)
608 dc->width = 1.0;
609 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width); // the same spinbutton is for alt+x
610 ret = TRUE;
611 }
612 break;
613 case GDK_Left:
614 case GDK_KP_Left:
615 if (!MOD__CTRL_ONLY) {
616 dc->width -= 0.01;
617 if (dc->width < 0.01)
618 dc->width = 0.01;
619 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width);
620 ret = TRUE;
621 }
622 break;
623 case GDK_x:
624 case GDK_X:
625 if (MOD__ALT_ONLY) {
626 desktop->setToolboxFocusTo ("altx-calligraphy");
627 ret = TRUE;
628 }
629 break;
630 case GDK_Escape:
631 SP_DT_SELECTION(desktop)->clear();
632 break;
634 default:
635 break;
636 }
637 default:
638 break;
639 }
641 if (!ret) {
642 if (((SPEventContextClass *) parent_class)->root_handler) {
643 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
644 }
645 }
647 return ret;
648 }
651 static void
652 clear_current(SPDynaDrawContext *dc)
653 {
654 /* reset bpath */
655 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
656 /* reset curve */
657 sp_curve_reset(dc->currentcurve);
658 sp_curve_reset(dc->cal1);
659 sp_curve_reset(dc->cal2);
660 /* reset points */
661 dc->npoints = 0;
662 }
664 static void
665 set_to_accumulated(SPDynaDrawContext *dc)
666 {
667 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
669 if (!sp_curve_empty(dc->accumulated)) {
670 NArtBpath *abp;
671 gchar *str;
673 if (!dc->repr) {
674 /* Create object */
675 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
677 /* Set style */
678 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
680 dc->repr = repr;
682 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
683 Inkscape::GC::release(dc->repr);
684 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
685 item->updateRepr();
686 SP_DT_SELECTION(desktop)->set(dc->repr);
687 }
688 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
689 str = sp_svg_write_path(abp);
690 g_assert( str != NULL );
691 nr_free(abp);
692 dc->repr->setAttribute("d", str);
693 g_free(str);
694 } else {
695 if (dc->repr) {
696 sp_repr_unparent(dc->repr);
697 }
698 dc->repr = NULL;
699 }
701 sp_document_done(SP_DT_DOCUMENT(desktop));
702 }
704 static void
705 accumulate_calligraphic(SPDynaDrawContext *dc)
706 {
707 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
708 sp_curve_reset(dc->accumulated); /* Is this required ?? */
709 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
710 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
711 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
712 sp_curve_closepath(dc->accumulated);
714 sp_curve_unref(rev_cal2);
716 sp_curve_reset(dc->cal1);
717 sp_curve_reset(dc->cal2);
718 }
719 }
721 static void
722 fit_and_split(SPDynaDrawContext *dc,
723 gboolean release)
724 {
725 fit_and_split_calligraphics(dc, release);
726 }
728 static double square(double const x)
729 {
730 return x * x;
731 }
733 static void
734 fit_and_split_calligraphics(SPDynaDrawContext *dc, gboolean release)
735 {
736 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
738 #ifdef DYNA_DRAW_VERBOSE
739 g_print("[F&S:R=%c]", release?'T':'F');
740 #endif
742 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
743 return; // just clicked
745 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
746 #define BEZIER_SIZE 4
747 #define BEZIER_MAX_BEZIERS 8
748 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
750 #ifdef DYNA_DRAW_VERBOSE
751 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
752 dc->npoints, release ? "TRUE" : "FALSE");
753 #endif
755 /* Current calligraphic */
756 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
757 /* dc->npoints > 0 */
758 /* g_print("calligraphics(1|2) reset\n"); */
759 sp_curve_reset(dc->cal1);
760 sp_curve_reset(dc->cal2);
762 sp_curve_moveto(dc->cal1, dc->point1[0]);
763 sp_curve_moveto(dc->cal2, dc->point2[0]);
764 }
766 NR::Point b1[BEZIER_MAX_LENGTH];
767 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
768 tolerance_sq, BEZIER_MAX_BEZIERS);
769 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
771 NR::Point b2[BEZIER_MAX_LENGTH];
772 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
773 tolerance_sq, BEZIER_MAX_BEZIERS);
774 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
776 if ( nb1 != -1 && nb2 != -1 ) {
777 /* Fit and draw and reset state */
778 #ifdef DYNA_DRAW_VERBOSE
779 g_print("nb1:%d nb2:%d\n", nb1, nb2);
780 #endif
781 /* CanvasShape */
782 if (! release) {
783 sp_curve_reset(dc->currentcurve);
784 sp_curve_moveto(dc->currentcurve, b1[0]);
785 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
786 sp_curve_curveto(dc->currentcurve, bp1[1],
787 bp1[2], bp1[3]);
788 }
789 sp_curve_lineto(dc->currentcurve,
790 b2[BEZIER_SIZE*(nb2-1) + 3]);
791 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
792 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
793 }
794 sp_curve_closepath(dc->currentcurve);
795 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
796 }
798 /* Current calligraphic */
799 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
800 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
801 }
802 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
803 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
804 }
805 } else {
806 /* fixme: ??? */
807 #ifdef DYNA_DRAW_VERBOSE
808 g_print("[fit_and_split_calligraphics] failed to fit-cubic.\n");
809 #endif
810 draw_temporary_box(dc);
812 for (gint i = 1; i < dc->npoints; i++) {
813 sp_curve_lineto(dc->cal1, dc->point1[i]);
814 }
815 for (gint i = 1; i < dc->npoints; i++) {
816 sp_curve_lineto(dc->cal2, dc->point2[i]);
817 }
818 }
820 /* Fit and draw and copy last point */
821 #ifdef DYNA_DRAW_VERBOSE
822 g_print("[%d]Yup\n", dc->npoints);
823 #endif
824 if (!release) {
825 g_assert(!sp_curve_empty(dc->currentcurve));
827 SPCanvasItem *cbp = sp_canvas_item_new(SP_DT_SKETCH(SP_EVENT_CONTEXT(dc)->desktop),
828 SP_TYPE_CANVAS_BPATH,
829 NULL);
830 SPCurve *curve = sp_curve_copy(dc->currentcurve);
831 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
832 sp_curve_unref(curve);
833 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), 0x000000ff, SP_WIND_RULE_EVENODD);
834 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
835 /* fixme: Cannot we cascade it to root more clearly? */
836 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
838 dc->segments = g_slist_prepend(dc->segments, cbp);
839 }
841 dc->point1[0] = dc->point1[dc->npoints - 1];
842 dc->point2[0] = dc->point2[dc->npoints - 1];
843 dc->npoints = 1;
844 } else {
845 draw_temporary_box(dc);
846 }
847 }
849 static void
850 draw_temporary_box(SPDynaDrawContext *dc)
851 {
852 sp_curve_reset(dc->currentcurve);
853 sp_curve_moveto(dc->currentcurve, dc->point1[0]);
854 for (gint i = 1; i < dc->npoints; i++) {
855 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
856 }
857 for (gint i = dc->npoints-1; i >= 0; i--) {
858 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
859 }
860 sp_curve_closepath(dc->currentcurve);
861 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
862 }
864 /*
865 Local Variables:
866 mode:c++
867 c-file-style:"stroustrup"
868 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
869 indent-tabs-mode:nil
870 fill-column:99
871 End:
872 */
873 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :