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 /*
22 * TODO: Tue Oct 2 22:57:15 2001
23 * - Decide control point behavior when use_calligraphic==1.
24 * - Decide to use NORMALIZED_COORDINATE or not.
25 * - Bug fix.
26 */
28 #define noDYNA_DRAW_VERBOSE
30 #include "config.h"
32 #include <gtk/gtk.h>
33 #include <gdk/gdkkeysyms.h>
35 #include "svg/svg.h"
36 #include "display/canvas-bpath.h"
37 #include "display/bezier-utils.h"
39 #include "macros.h"
40 #include "document.h"
41 #include "selection.h"
42 #include "desktop.h"
43 #include "desktop-events.h"
44 #include "desktop-handles.h"
45 #include "desktop-affine.h"
46 #include "desktop-style.h"
47 #include "message-context.h"
48 #include "pixmaps/cursor-calligraphy.xpm"
49 #include "dyna-draw-context.h"
50 #include "libnr/n-art-bpath.h"
51 #include "libnr/nr-path.h"
52 #include "xml/repr.h"
53 #include "context-fns.h"
54 #include "sp-item.h"
56 #define DDC_RED_RGBA 0xff0000ff
57 #define DDC_GREEN_RGBA 0x000000ff
59 #define SAMPLE_TIMEOUT 10
60 #define TOLERANCE_LINE 1.0
61 #define TOLERANCE_CALLIGRAPHIC 3.0
62 #define DYNA_EPSILON 1.0e-6
64 #define DYNA_MIN_WIDTH 1.0e-6
66 #define DRAG_MIN 0.0
67 #define DRAG_DEFAULT 1.0
68 #define DRAG_MAX 1.0
70 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
71 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
72 static void sp_dyna_draw_context_dispose(GObject *object);
74 static void sp_dyna_draw_context_setup(SPEventContext *ec);
75 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
76 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
78 static void clear_current(SPDynaDrawContext *dc);
79 static void set_to_accumulated(SPDynaDrawContext *dc);
80 static void concat_current_line(SPDynaDrawContext *dc);
81 static void accumulate_calligraphic(SPDynaDrawContext *dc);
83 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
84 static void fit_and_split_line(SPDynaDrawContext *ddc, gboolean release);
85 static void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release);
87 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
88 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
89 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
90 static NR::Point sp_dyna_draw_get_curr_vpoint(SPDynaDrawContext const *ddc);
91 static void draw_temporary_box(SPDynaDrawContext *dc);
94 static SPEventContextClass *parent_class;
96 GtkType
97 sp_dyna_draw_context_get_type(void)
98 {
99 static GType type = 0;
100 if (!type) {
101 GTypeInfo info = {
102 sizeof(SPDynaDrawContextClass),
103 NULL, NULL,
104 (GClassInitFunc) sp_dyna_draw_context_class_init,
105 NULL, NULL,
106 sizeof(SPDynaDrawContext),
107 4,
108 (GInstanceInitFunc) sp_dyna_draw_context_init,
109 NULL, /* value_table */
110 };
111 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
112 }
113 return type;
114 }
116 static void
117 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
118 {
119 GObjectClass *object_class = (GObjectClass *) klass;
120 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
122 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
124 object_class->dispose = sp_dyna_draw_context_dispose;
126 event_context_class->setup = sp_dyna_draw_context_setup;
127 event_context_class->set = sp_dyna_draw_context_set;
128 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
129 }
131 static void
132 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
133 {
134 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
136 event_context->cursor_shape = cursor_calligraphy_xpm;
137 event_context->hot_x = 4;
138 event_context->hot_y = 4;
140 ddc->accumulated = NULL;
141 ddc->segments = NULL;
142 ddc->currentcurve = NULL;
143 ddc->currentshape = NULL;
144 ddc->npoints = 0;
145 ddc->cal1 = NULL;
146 ddc->cal2 = NULL;
147 ddc->repr = NULL;
149 /* DynaDraw values */
150 ddc->cur = NR::Point(0,0);
151 ddc->last = NR::Point(0,0);
152 ddc->vel = NR::Point(0,0);
153 ddc->acc = NR::Point(0,0);
154 ddc->ang = NR::Point(0,0);
155 ddc->del = NR::Point(0,0);
157 /* attributes */
158 ddc->use_timeout = FALSE;
159 ddc->use_calligraphic = TRUE;
160 ddc->timer_id = 0;
161 ddc->dragging = FALSE;
162 ddc->dynahand = FALSE;
164 ddc->mass = 0.3;
165 ddc->drag = DRAG_DEFAULT;
166 ddc->angle = 30.0;
167 ddc->width = 0.2;
169 ddc->vel_thin = 0.1;
170 ddc->flatness = 0.9;
171 }
173 static void
174 sp_dyna_draw_context_dispose(GObject *object)
175 {
176 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
178 if (ddc->accumulated) {
179 ddc->accumulated = sp_curve_unref(ddc->accumulated);
180 }
182 while (ddc->segments) {
183 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
184 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
185 }
187 if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
188 if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
189 if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
191 if (ddc->currentshape) {
192 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
193 ddc->currentshape = NULL;
194 }
196 if (ddc->_message_context) {
197 delete ddc->_message_context;
198 }
200 G_OBJECT_CLASS(parent_class)->dispose(object);
201 }
203 static void
204 sp_dyna_draw_context_setup(SPEventContext *ec)
205 {
206 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
208 if (((SPEventContextClass *) parent_class)->setup)
209 ((SPEventContextClass *) parent_class)->setup(ec);
211 ddc->accumulated = sp_curve_new_sized(32);
212 ddc->currentcurve = sp_curve_new_sized(4);
214 ddc->cal1 = sp_curve_new_sized(32);
215 ddc->cal2 = sp_curve_new_sized(32);
217 /* style should be changed when dc->use_calligraphc is touched */
218 ddc->currentshape = sp_canvas_item_new(SP_DT_SKETCH(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
219 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
220 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
221 /* fixme: Cannot we cascade it to root more clearly? */
222 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
224 sp_event_context_read(ec, "mass");
225 sp_event_context_read(ec, "drag");
226 sp_event_context_read(ec, "angle");
227 sp_event_context_read(ec, "width");
228 sp_event_context_read(ec, "thinning");
229 sp_event_context_read(ec, "flatness");
230 sp_event_context_read(ec, "usepressure");
231 sp_event_context_read(ec, "usetilt");
233 ddc->is_drawing = false;
235 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
236 }
238 static void
239 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
240 {
241 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
243 if (!strcmp(key, "mass")) {
244 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
245 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
246 } else if (!strcmp(key, "drag")) {
247 double const dval = ( val ? g_ascii_strtod (val, NULL) : DRAG_DEFAULT );
248 ddc->drag = CLAMP(dval, DRAG_MIN, DRAG_MAX);
249 } else if (!strcmp(key, "angle")) {
250 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
251 ddc->angle = CLAMP (dval, -90, 90);
252 } else if (!strcmp(key, "width")) {
253 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
254 ddc->width = CLAMP(dval, -1000.0, 1000.0);
255 } else if (!strcmp(key, "thinning")) {
256 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
257 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
258 } else if (!strcmp(key, "flatness")) {
259 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
260 ddc->flatness = CLAMP(dval, 0, 1.0);
261 } else if (!strcmp(key, "usepressure")) {
262 ddc->usepressure = (val && strcmp(val, "0"));
263 } else if (!strcmp(key, "usetilt")) {
264 ddc->usetilt = (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 /* Get current view point */
295 static NR::Point sp_dyna_draw_get_curr_vpoint(SPDynaDrawContext const *dc)
296 {
297 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
298 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
299 return NR::Point(dc->cur[NR::X] * max + drect.min()[NR::X], dc->cur[NR::Y] * max + drect.min()[NR::Y]);
300 }
302 static void
303 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
304 {
305 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
306 dc->vel = NR::Point(0,0);
307 dc->acc = NR::Point(0,0);
308 dc->ang = NR::Point(0,0);
309 dc->del = NR::Point(0,0);
310 }
312 static void
313 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
314 {
315 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
316 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
317 else
318 dc->pressure = DDC_DEFAULT_PRESSURE;
320 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
321 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
322 else
323 dc->xtilt = DDC_DEFAULT_TILT;
325 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
326 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
327 else
328 dc->ytilt = DDC_DEFAULT_TILT;
329 }
332 static gboolean
333 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
334 {
335 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
337 /* Calculate mass and drag */
338 double const mass = flerp(1.0, 160.0, dc->mass);
339 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
341 /* Calculate force and acceleration */
342 NR::Point force = n - dc->cur;
343 if ( NR::L2(force) < DYNA_EPSILON ) {
344 return FALSE;
345 }
347 dc->acc = force / mass;
349 /* Calculate new velocity */
350 dc->vel += dc->acc;
352 /* Calculate angle of drawing tool */
354 double a1;
355 if (dc->usetilt) {
356 // 1a. calculate nib angle from input device tilt:
357 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
359 if (length > 0) {
360 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
361 a1 = atan2(ang1);
362 }
363 else
364 a1 = 0.0;
365 }
366 else {
367 // 1b. fixed dc->angle (absolutely flat nib):
368 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
369 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
370 a1 = atan2(ang1);
371 }
373 // 2. perpendicular to dc->vel (absolutely non-flat nib):
374 gdouble const mag_vel = NR::L2(dc->vel);
375 if ( mag_vel < DYNA_EPSILON ) {
376 return FALSE;
377 }
378 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
380 // 3. Average them using flatness parameter:
381 // calculate angles
382 double a2 = atan2(ang2);
383 // flip a2 to force it to be in the same half-circle as a1
384 bool flipped = false;
385 if (fabs (a2-a1) > 0.5*M_PI) {
386 a2 += M_PI;
387 flipped = true;
388 }
389 // normalize a2
390 if (a2 > M_PI)
391 a2 -= 2*M_PI;
392 if (a2 < -M_PI)
393 a2 += 2*M_PI;
394 // find the flatness-weighted bisector angle, unflip if a2 was flipped
395 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
396 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
397 // convert to point
398 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
400 /* Apply drag */
401 dc->vel *= 1.0 - drag;
403 /* Update position */
404 dc->last = dc->cur;
405 dc->cur += dc->vel;
407 return TRUE;
408 }
410 static void
411 sp_dyna_draw_brush(SPDynaDrawContext *dc)
412 {
413 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
415 if (dc->use_calligraphic) {
416 /* calligraphics */
418 // How much velocity thins strokestyle
419 double vel_thin = flerp (0, 160, dc->vel_thin);
421 // Influence of pressure on thickness
422 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
424 double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
425 if ( width < 0.02 * dc->width ) {
426 width = 0.02 * dc->width;
427 }
429 NR::Point del = 0.05 * width * dc->ang;
431 dc->point1[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur + del);
432 dc->point2[dc->npoints] = sp_dyna_draw_get_vpoint(dc, dc->cur - del);
434 dc->del = del;
435 } else {
436 dc->point1[dc->npoints] = sp_dyna_draw_get_curr_vpoint(dc);
437 }
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;
450 dc->dynahand = TRUE;
452 int x, y;
453 gtk_widget_get_pointer(GTK_WIDGET(canvas), &x, &y);
454 NR::Point p = sp_canvas_window_to_world(canvas, NR::Point(x, y));
455 p = desktop->w2d(p);
456 if (! sp_dyna_draw_apply(dc, p)) {
457 return TRUE;
458 }
460 if ( dc->cur != dc->last ) {
461 sp_dyna_draw_brush(dc);
462 g_assert( dc->npoints > 0 );
463 fit_and_split(dc, FALSE);
464 }
466 return TRUE;
467 }
469 void
470 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
471 {
472 desktop->setToolboxAdjustmentValue (id, value);
473 }
475 gint
476 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
477 GdkEvent *event)
478 {
479 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
480 SPDesktop *desktop = event_context->desktop;
482 gint ret = FALSE;
484 switch (event->type) {
485 case GDK_BUTTON_PRESS:
486 if ( event->button.button == 1 ) {
488 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
490 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
491 return TRUE;
492 }
494 NR::Point const button_w(event->button.x,
495 event->button.y);
496 NR::Point const button_dt(desktop->w2d(button_w));
497 sp_dyna_draw_reset(dc, button_dt);
498 sp_dyna_draw_extinput(dc, event);
499 sp_dyna_draw_apply(dc, button_dt);
500 sp_curve_reset(dc->accumulated);
501 if (dc->repr) {
502 dc->repr = NULL;
503 }
505 /* initialize first point */
506 dc->npoints = 0;
508 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
509 ( dc->use_timeout
510 ? ( GDK_KEY_PRESS_MASK |
511 GDK_BUTTON_RELEASE_MASK |
512 GDK_BUTTON_PRESS_MASK )
513 : ( GDK_KEY_PRESS_MASK |
514 GDK_BUTTON_RELEASE_MASK |
515 GDK_POINTER_MOTION_MASK |
516 GDK_BUTTON_PRESS_MASK ) ),
517 NULL,
518 event->button.time);
520 if ( dc->use_timeout && !dc->timer_id ) {
521 dc->timer_id = gtk_timeout_add(SAMPLE_TIMEOUT, sp_dyna_draw_timeout_handler, dc);
522 }
523 ret = TRUE;
525 dc->is_drawing = true;
526 }
527 break;
528 case GDK_MOTION_NOTIFY:
529 if ( dc->is_drawing && !dc->use_timeout && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
530 dc->dragging = TRUE;
531 dc->dynahand = TRUE;
533 NR::Point const motion_w(event->motion.x,
534 event->motion.y);
535 NR::Point const motion_dt(desktop->w2d(motion_w));
537 sp_dyna_draw_extinput(dc, event);
538 if (!sp_dyna_draw_apply(dc, motion_dt)) {
539 ret = TRUE;
540 break;
541 }
543 if ( dc->cur != dc->last ) {
544 sp_dyna_draw_brush(dc);
545 g_assert( dc->npoints > 0 );
546 fit_and_split(dc, FALSE);
547 }
548 ret = TRUE;
549 }
550 break;
552 case GDK_BUTTON_RELEASE:
553 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
554 dc->is_drawing = false;
555 if ( event->button.button == 1
556 && dc->use_timeout
557 && dc->timer_id != 0 )
558 {
559 gtk_timeout_remove(dc->timer_id);
560 dc->timer_id = 0;
561 }
562 if ( dc->dragging && event->button.button == 1 ) {
563 dc->dragging = FALSE;
565 /* release */
566 if (dc->dynahand) {
567 dc->dynahand = FALSE;
568 /* Remove all temporary line segments */
569 while (dc->segments) {
570 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
571 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
572 }
573 /* Create object */
574 fit_and_split(dc, TRUE);
575 if (dc->use_calligraphic) {
576 accumulate_calligraphic(dc);
577 } else {
578 concat_current_line(dc);
579 }
580 set_to_accumulated(dc); /* temporal implementation */
581 if (dc->use_calligraphic /* || dc->cinside*/) {
582 /* reset accumulated curve */
583 sp_curve_reset(dc->accumulated);
584 clear_current(dc);
585 if (dc->repr) {
586 dc->repr = NULL;
587 }
588 }
589 }
590 ret = TRUE;
591 }
592 break;
593 case GDK_KEY_PRESS:
594 switch (get_group0_keyval (&event->key)) {
595 case GDK_Up:
596 case GDK_KP_Up:
597 if (!MOD__CTRL_ONLY) {
598 dc->angle += 5.0;
599 if (dc->angle > 90.0)
600 dc->angle = 90.0;
601 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
602 ret = TRUE;
603 }
604 break;
605 case GDK_Down:
606 case GDK_KP_Down:
607 if (!MOD__CTRL_ONLY) {
608 dc->angle -= 5.0;
609 if (dc->angle < -90.0)
610 dc->angle = -90.0;
611 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
612 ret = TRUE;
613 }
614 break;
615 case GDK_Right:
616 case GDK_KP_Right:
617 if (!MOD__CTRL_ONLY) {
618 dc->width += 0.01;
619 if (dc->width > 1.0)
620 dc->width = 1.0;
621 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width); // the same spinbutton is for alt+x
622 ret = TRUE;
623 }
624 break;
625 case GDK_Left:
626 case GDK_KP_Left:
627 if (!MOD__CTRL_ONLY) {
628 dc->width -= 0.01;
629 if (dc->width < 0.01)
630 dc->width = 0.01;
631 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width);
632 ret = TRUE;
633 }
634 break;
635 case GDK_x:
636 case GDK_X:
637 if (MOD__ALT_ONLY) {
638 desktop->setToolboxFocusTo ("altx-calligraphy");
639 ret = TRUE;
640 }
641 break;
642 case GDK_Escape:
643 SP_DT_SELECTION(desktop)->clear();
644 break;
646 default:
647 break;
648 }
649 default:
650 break;
651 }
653 if (!ret) {
654 if (((SPEventContextClass *) parent_class)->root_handler) {
655 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
656 }
657 }
659 return ret;
660 }
663 static void
664 clear_current(SPDynaDrawContext *dc)
665 {
666 /* reset bpath */
667 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
668 /* reset curve */
669 sp_curve_reset(dc->currentcurve);
670 sp_curve_reset(dc->cal1);
671 sp_curve_reset(dc->cal2);
672 /* reset points */
673 dc->npoints = 0;
674 }
676 static void
677 set_to_accumulated(SPDynaDrawContext *dc)
678 {
679 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
681 if (!sp_curve_empty(dc->accumulated)) {
682 NArtBpath *abp;
683 gchar *str;
685 if (!dc->repr) {
686 /* Create object */
687 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
689 /* Set style */
690 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
692 dc->repr = repr;
694 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
695 Inkscape::GC::release(dc->repr);
696 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
697 item->updateRepr();
698 SP_DT_SELECTION(desktop)->set(dc->repr);
699 }
700 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
701 str = sp_svg_write_path(abp);
702 g_assert( str != NULL );
703 nr_free(abp);
704 dc->repr->setAttribute("d", str);
705 g_free(str);
706 } else {
707 if (dc->repr) {
708 sp_repr_unparent(dc->repr);
709 }
710 dc->repr = NULL;
711 }
713 sp_document_done(SP_DT_DOCUMENT(desktop));
714 }
716 static void
717 concat_current_line(SPDynaDrawContext *dc)
718 {
719 if (!sp_curve_empty(dc->currentcurve)) {
720 NArtBpath *bpath;
721 if (sp_curve_empty(dc->accumulated)) {
722 bpath = sp_curve_first_bpath(dc->currentcurve);
723 g_assert( bpath->code == NR_MOVETO_OPEN );
724 sp_curve_moveto(dc->accumulated, bpath->x3, bpath->y3);
725 }
726 bpath = sp_curve_last_bpath(dc->currentcurve);
727 if ( bpath->code == NR_CURVETO ) {
728 sp_curve_curveto(dc->accumulated,
729 bpath->x1, bpath->y1,
730 bpath->x2, bpath->y2,
731 bpath->x3, bpath->y3);
732 } else if ( bpath->code == NR_LINETO ) {
733 sp_curve_lineto(dc->accumulated, bpath->x3, bpath->y3);
734 } else {
735 g_assert_not_reached();
736 }
737 }
738 }
740 static void
741 accumulate_calligraphic(SPDynaDrawContext *dc)
742 {
743 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
744 sp_curve_reset(dc->accumulated); /* Is this required ?? */
745 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
746 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
747 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
748 sp_curve_closepath(dc->accumulated);
750 sp_curve_unref(rev_cal2);
752 sp_curve_reset(dc->cal1);
753 sp_curve_reset(dc->cal2);
754 }
755 }
757 static void
758 fit_and_split(SPDynaDrawContext *dc,
759 gboolean release)
760 {
761 if (dc->use_calligraphic) {
762 fit_and_split_calligraphics(dc, release);
763 } else {
764 fit_and_split_line(dc, release);
765 }
766 }
768 static double square(double const x)
769 {
770 return x * x;
771 }
773 static void
774 fit_and_split_line(SPDynaDrawContext *dc,
775 gboolean release)
776 {
777 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_LINE );
779 NR::Point b[4];
780 double const n_segs = sp_bezier_fit_cubic(b, dc->point1, dc->npoints, tolerance_sq);
781 if ( n_segs > 0
782 && dc->npoints < SAMPLING_SIZE )
783 {
784 /* Fit and draw and reset state */
785 #ifdef DYNA_DRAW_VERBOSE
786 g_print("%d", dc->npoints);
787 #endif
788 sp_curve_reset(dc->currentcurve);
789 sp_curve_moveto(dc->currentcurve, b[0]);
790 sp_curve_curveto(dc->currentcurve, b[1], b[2], b[3]);
791 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
792 } else {
793 /* Fit and draw and copy last point */
794 #ifdef DYNA_DRAW_VERBOSE
795 g_print("[%d]Yup\n", dc->npoints);
796 #endif
797 g_assert(!sp_curve_empty(dc->currentcurve));
798 concat_current_line(dc);
800 SPCanvasItem *cbp = sp_canvas_item_new(SP_DT_SKETCH(SP_EVENT_CONTEXT(dc)->desktop),
801 SP_TYPE_CANVAS_BPATH,
802 NULL);
803 SPCurve *curve = sp_curve_copy(dc->currentcurve);
804 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(cbp), curve);
805 sp_curve_unref(curve);
806 /* fixme: We have to parse style color somehow */
807 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), DDC_GREEN_RGBA, SP_WIND_RULE_EVENODD);
808 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x000000ff, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
809 /* fixme: Cannot we cascade it to root more clearly? */
810 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
812 dc->segments = g_slist_prepend(dc->segments, cbp);
813 dc->point1[0] = dc->point1[dc->npoints - 2];
814 dc->npoints = 1;
815 }
816 }
818 static void
819 fit_and_split_calligraphics(SPDynaDrawContext *dc, gboolean release)
820 {
821 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
823 #ifdef DYNA_DRAW_VERBOSE
824 g_print("[F&S:R=%c]", release?'T':'F');
825 #endif
827 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
828 return; // just clicked
830 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
831 #define BEZIER_SIZE 4
832 #define BEZIER_MAX_BEZIERS 8
833 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
835 #ifdef DYNA_DRAW_VERBOSE
836 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
837 dc->npoints, release ? "TRUE" : "FALSE");
838 #endif
840 /* Current calligraphic */
841 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
842 /* dc->npoints > 0 */
843 /* g_print("calligraphics(1|2) reset\n"); */
844 sp_curve_reset(dc->cal1);
845 sp_curve_reset(dc->cal2);
847 sp_curve_moveto(dc->cal1, dc->point1[0]);
848 sp_curve_moveto(dc->cal2, dc->point2[0]);
849 }
851 NR::Point b1[BEZIER_MAX_LENGTH];
852 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
853 tolerance_sq, BEZIER_MAX_BEZIERS);
854 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
856 NR::Point b2[BEZIER_MAX_LENGTH];
857 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
858 tolerance_sq, BEZIER_MAX_BEZIERS);
859 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
861 if ( nb1 != -1 && nb2 != -1 ) {
862 /* Fit and draw and reset state */
863 #ifdef DYNA_DRAW_VERBOSE
864 g_print("nb1:%d nb2:%d\n", nb1, nb2);
865 #endif
866 /* CanvasShape */
867 if (! release) {
868 sp_curve_reset(dc->currentcurve);
869 sp_curve_moveto(dc->currentcurve, b1[0]);
870 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
871 sp_curve_curveto(dc->currentcurve, bp1[1],
872 bp1[2], bp1[3]);
873 }
874 sp_curve_lineto(dc->currentcurve,
875 b2[BEZIER_SIZE*(nb2-1) + 3]);
876 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
877 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
878 }
879 sp_curve_closepath(dc->currentcurve);
880 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
881 }
883 /* Current calligraphic */
884 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
885 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
886 }
887 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
888 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
889 }
890 } else {
891 /* fixme: ??? */
892 #ifdef DYNA_DRAW_VERBOSE
893 g_print("[fit_and_split_calligraphics] failed to fit-cubic.\n");
894 #endif
895 draw_temporary_box(dc);
897 for (gint i = 1; i < dc->npoints; i++) {
898 sp_curve_lineto(dc->cal1, dc->point1[i]);
899 }
900 for (gint i = 1; i < dc->npoints; i++) {
901 sp_curve_lineto(dc->cal2, dc->point2[i]);
902 }
903 }
905 /* Fit and draw and copy last point */
906 #ifdef DYNA_DRAW_VERBOSE
907 g_print("[%d]Yup\n", dc->npoints);
908 #endif
909 if (!release) {
910 g_assert(!sp_curve_empty(dc->currentcurve));
912 SPCanvasItem *cbp = sp_canvas_item_new(SP_DT_SKETCH(SP_EVENT_CONTEXT(dc)->desktop),
913 SP_TYPE_CANVAS_BPATH,
914 NULL);
915 SPCurve *curve = sp_curve_copy(dc->currentcurve);
916 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
917 sp_curve_unref(curve);
918 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), 0x000000ff, SP_WIND_RULE_EVENODD);
919 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
920 /* fixme: Cannot we cascade it to root more clearly? */
921 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
923 dc->segments = g_slist_prepend(dc->segments, cbp);
924 }
926 dc->point1[0] = dc->point1[dc->npoints - 1];
927 dc->point2[0] = dc->point2[dc->npoints - 1];
928 dc->npoints = 1;
929 } else {
930 draw_temporary_box(dc);
931 }
932 }
934 static void
935 draw_temporary_box(SPDynaDrawContext *dc)
936 {
937 sp_curve_reset(dc->currentcurve);
938 sp_curve_moveto(dc->currentcurve, dc->point1[0]);
939 for (gint i = 1; i < dc->npoints; i++) {
940 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
941 }
942 for (gint i = dc->npoints-1; i >= 0; i--) {
943 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
944 }
945 sp_curve_closepath(dc->currentcurve);
946 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
947 }
949 /*
950 Local Variables:
951 mode:c++
952 c-file-style:"stroustrup"
953 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
954 indent-tabs-mode:nil
955 fill-column:99
956 End:
957 */
958 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :