1 #define __SP_DYNA_DRAW_CONTEXT_C__
3 /*
4 * Handwriting-like drawing mode
5 *
6 * Authors:
7 * Mitsuru Oka <oka326@parkcity.ne.jp>
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 * MenTaLguY <mental@rydia.net>
11 *
12 * The original dynadraw code:
13 * Paul Haeberli <paul@sgi.com>
14 *
15 * Copyright (C) 1998 The Free Software Foundation
16 * Copyright (C) 1999-2005 authors
17 * Copyright (C) 2001-2002 Ximian, Inc.
18 * Copyright (C) 2005-2006 bulia byak
19 * Copyright (C) 2006 MenTaLguY
20 *
21 * Released under GNU GPL, read the file 'COPYING' for more information
22 */
24 #define noDYNA_DRAW_VERBOSE
26 #include "config.h"
28 #include <gtk/gtk.h>
29 #include <gdk/gdkkeysyms.h>
30 #include <glibmm/i18n.h>
32 #include "svg/svg.h"
33 #include "display/canvas-bpath.h"
34 #include "display/bezier-utils.h"
36 #include <glib/gmem.h>
37 #include "macros.h"
38 #include "document.h"
39 #include "selection.h"
40 #include "desktop.h"
41 #include "desktop-events.h"
42 #include "desktop-handles.h"
43 #include "desktop-affine.h"
44 #include "desktop-style.h"
45 #include "message-context.h"
46 #include "pixmaps/cursor-calligraphy.xpm"
47 #include "dyna-draw-context.h"
48 #include "libnr/n-art-bpath.h"
49 #include "libnr/nr-path.h"
50 #include "xml/repr.h"
51 #include "context-fns.h"
52 #include "sp-item.h"
53 #include "inkscape.h"
54 #include "color.h"
56 #define DDC_RED_RGBA 0xff0000ff
58 #define SAMPLE_TIMEOUT 10
59 #define TOLERANCE_LINE 1.0
60 #define TOLERANCE_CALLIGRAPHIC 3.0
62 #define DYNA_EPSILON 0.5e-6
63 #define DYNA_EPSILON_START 0.5e-2
64 #define DYNA_VEL_START 1e-5
66 #define DYNA_MIN_WIDTH 1.0e-6
68 #define DRAG_MIN 0.0
69 #define DRAG_DEFAULT 1.0
70 #define DRAG_MAX 1.0
72 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
73 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
74 static void sp_dyna_draw_context_dispose(GObject *object);
76 static void sp_dyna_draw_context_setup(SPEventContext *ec);
77 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
78 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
80 static void clear_current(SPDynaDrawContext *dc);
81 static void set_to_accumulated(SPDynaDrawContext *dc);
82 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
83 static void accumulate_calligraphic(SPDynaDrawContext *dc);
85 static void fit_and_split(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 void draw_temporary_box(SPDynaDrawContext *dc);
93 static SPEventContextClass *parent_class;
95 GtkType
96 sp_dyna_draw_context_get_type(void)
97 {
98 static GType type = 0;
99 if (!type) {
100 GTypeInfo info = {
101 sizeof(SPDynaDrawContextClass),
102 NULL, NULL,
103 (GClassInitFunc) sp_dyna_draw_context_class_init,
104 NULL, NULL,
105 sizeof(SPDynaDrawContext),
106 4,
107 (GInstanceInitFunc) sp_dyna_draw_context_init,
108 NULL, /* value_table */
109 };
110 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
111 }
112 return type;
113 }
115 static void
116 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
117 {
118 GObjectClass *object_class = (GObjectClass *) klass;
119 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
121 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
123 object_class->dispose = sp_dyna_draw_context_dispose;
125 event_context_class->setup = sp_dyna_draw_context_setup;
126 event_context_class->set = sp_dyna_draw_context_set;
127 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
128 }
130 static void
131 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
132 {
133 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
135 event_context->cursor_shape = cursor_calligraphy_xpm;
136 event_context->hot_x = 4;
137 event_context->hot_y = 4;
139 ddc->accumulated = NULL;
140 ddc->segments = NULL;
141 ddc->currentcurve = NULL;
142 ddc->currentshape = NULL;
143 ddc->npoints = 0;
144 ddc->cal1 = NULL;
145 ddc->cal2 = NULL;
146 ddc->repr = NULL;
148 /* DynaDraw values */
149 ddc->cur = NR::Point(0,0);
150 ddc->last = NR::Point(0,0);
151 ddc->vel = NR::Point(0,0);
152 ddc->vel_max = 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->dragging = FALSE;
160 ddc->mass = 0.3;
161 ddc->drag = DRAG_DEFAULT;
162 ddc->angle = 30.0;
163 ddc->width = 0.2;
165 ddc->vel_thin = 0.1;
166 ddc->flatness = 0.9;
167 ddc->cap_rounding = 0.0;
169 ddc->abs_width = false;
170 ddc->keep_selected = true;
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 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
218 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
219 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
220 /* fixme: Cannot we cascade it to root more clearly? */
221 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
223 sp_event_context_read(ec, "mass");
224 sp_event_context_read(ec, "wiggle");
225 sp_event_context_read(ec, "angle");
226 sp_event_context_read(ec, "width");
227 sp_event_context_read(ec, "thinning");
228 sp_event_context_read(ec, "tremor");
229 sp_event_context_read(ec, "flatness");
230 sp_event_context_read(ec, "usepressure");
231 sp_event_context_read(ec, "usetilt");
232 sp_event_context_read(ec, "abs_width");
233 sp_event_context_read(ec, "keep_selected");
234 sp_event_context_read(ec, "cap_rounding");
236 ddc->is_drawing = false;
238 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
239 }
241 static void
242 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
243 {
244 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
246 if (!strcmp(key, "mass")) {
247 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
248 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
249 } else if (!strcmp(key, "wiggle")) {
250 double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
251 ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
252 } else if (!strcmp(key, "angle")) {
253 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
254 ddc->angle = CLAMP (dval, -90, 90);
255 } else if (!strcmp(key, "width")) {
256 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
257 ddc->width = CLAMP(dval, -1000.0, 1000.0);
258 } else if (!strcmp(key, "thinning")) {
259 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
260 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
261 } else if (!strcmp(key, "tremor")) {
262 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
263 ddc->tremor = CLAMP(dval, 0.0, 1.0);
264 } else if (!strcmp(key, "flatness")) {
265 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
266 ddc->flatness = CLAMP(dval, 0, 1.0);
267 } else if (!strcmp(key, "usepressure")) {
268 ddc->usepressure = (val && strcmp(val, "0"));
269 } else if (!strcmp(key, "usetilt")) {
270 ddc->usetilt = (val && strcmp(val, "0"));
271 } else if (!strcmp(key, "abs_width")) {
272 ddc->abs_width = (val && strcmp(val, "0"));
273 } else if (!strcmp(key, "keep_selected")) {
274 ddc->keep_selected = (val && strcmp(val, "0"));
275 } else if (!strcmp(key, "cap_rounding")) {
276 ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
277 }
279 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
280 }
282 static double
283 flerp(double f0, double f1, double p)
284 {
285 return f0 + ( f1 - f0 ) * p;
286 }
288 /* Get normalized point */
289 static NR::Point
290 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
291 {
292 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
293 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
294 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
295 }
297 /* Get view point */
298 static NR::Point
299 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
300 {
301 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
302 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
303 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
304 }
306 static void
307 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
308 {
309 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
310 dc->vel = NR::Point(0,0);
311 dc->vel_max = 0;
312 dc->acc = NR::Point(0,0);
313 dc->ang = NR::Point(0,0);
314 dc->del = NR::Point(0,0);
315 }
317 static void
318 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
319 {
320 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
321 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
322 else
323 dc->pressure = DDC_DEFAULT_PRESSURE;
325 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
326 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
327 else
328 dc->xtilt = DDC_DEFAULT_TILT;
330 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
331 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
332 else
333 dc->ytilt = DDC_DEFAULT_TILT;
334 }
337 static gboolean
338 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
339 {
340 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
342 /* Calculate mass and drag */
343 double const mass = flerp(1.0, 160.0, dc->mass);
344 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
346 /* Calculate force and acceleration */
347 NR::Point force = n - dc->cur;
348 if ( NR::L2(force) < DYNA_EPSILON || (dc->vel_max < DYNA_VEL_START && NR::L2(force) < DYNA_EPSILON_START)) {
349 return FALSE;
350 }
352 dc->acc = force / mass;
354 /* Calculate new velocity */
355 dc->vel += dc->acc;
357 if (NR::L2(dc->vel) > dc->vel_max)
358 dc->vel_max = NR::L2(dc->vel);
360 /* Calculate angle of drawing tool */
362 double a1;
363 if (dc->usetilt) {
364 // 1a. calculate nib angle from input device tilt:
365 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
367 if (length > 0) {
368 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
369 a1 = atan2(ang1);
370 }
371 else
372 a1 = 0.0;
373 }
374 else {
375 // 1b. fixed dc->angle (absolutely flat nib):
376 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
377 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
378 a1 = atan2(ang1);
379 }
381 // 2. perpendicular to dc->vel (absolutely non-flat nib):
382 gdouble const mag_vel = NR::L2(dc->vel);
383 if ( mag_vel < DYNA_EPSILON ) {
384 return FALSE;
385 }
386 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
388 // 3. Average them using flatness parameter:
389 // calculate angles
390 double a2 = atan2(ang2);
391 // flip a2 to force it to be in the same half-circle as a1
392 bool flipped = false;
393 if (fabs (a2-a1) > 0.5*M_PI) {
394 a2 += M_PI;
395 flipped = true;
396 }
397 // normalize a2
398 if (a2 > M_PI)
399 a2 -= 2*M_PI;
400 if (a2 < -M_PI)
401 a2 += 2*M_PI;
402 // find the flatness-weighted bisector angle, unflip if a2 was flipped
403 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
404 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
406 double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
408 if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
409 return FALSE;
410 }
412 // convert to point
413 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
415 // g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", NR::L2(force), NR::L2(dc->acc), dc->vel_max, NR::L2(dc->vel), a1, a2, new_ang);
417 /* Apply drag */
418 dc->vel *= 1.0 - drag;
420 /* Update position */
421 dc->last = dc->cur;
422 dc->cur += dc->vel;
424 return TRUE;
425 }
427 static void
428 sp_dyna_draw_brush(SPDynaDrawContext *dc)
429 {
430 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
432 // How much velocity thins strokestyle
433 double vel_thin = flerp (0, 160, dc->vel_thin);
435 // Influence of pressure on thickness
436 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
438 double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
440 double tremble_left = 0, tremble_right = 0;
441 if (dc->tremor > 0) {
442 // obtain two normally distributed random variables, using polar Box-Muller transform
443 double x1, x2, w, y1, y2;
444 do {
445 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
446 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
447 w = x1 * x1 + x2 * x2;
448 } while ( w >= 1.0 );
449 w = sqrt( (-2.0 * log( w ) ) / w );
450 y1 = x1 * w;
451 y2 = x2 * w;
453 // deflect both left and right edges randomly and independently, so that:
454 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
455 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
456 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
457 // comparatively smooth and slow ones excessively jittery
458 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
459 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
460 }
462 if ( width < 0.02 * dc->width ) {
463 width = 0.02 * dc->width;
464 }
466 double dezoomify_factor = 0.05 * 1000;
467 if (!dc->abs_width) {
468 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
469 }
471 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
472 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
474 NR::Point abs_middle = sp_dyna_draw_get_vpoint(dc, dc->cur);
476 dc->point1[dc->npoints] = abs_middle + del_left;
477 dc->point2[dc->npoints] = abs_middle - del_right;
479 dc->del = 0.5*(del_left + del_right);
481 dc->npoints++;
482 }
484 void
485 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
486 {
487 desktop->setToolboxAdjustmentValue (id, value);
488 }
490 static void
491 calligraphic_cancel(SPDynaDrawContext *dc)
492 {
493 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
494 dc->dragging = FALSE;
495 dc->is_drawing = false;
496 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
497 /* Remove all temporary line segments */
498 while (dc->segments) {
499 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
500 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
501 }
502 /* reset accumulated curve */
503 sp_curve_reset(dc->accumulated);
504 clear_current(dc);
505 if (dc->repr) {
506 dc->repr = NULL;
507 }
508 }
511 gint
512 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
513 GdkEvent *event)
514 {
515 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
516 SPDesktop *desktop = event_context->desktop;
518 gint ret = FALSE;
520 switch (event->type) {
521 case GDK_BUTTON_PRESS:
522 if ( event->button.button == 1 ) {
524 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
526 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
527 return TRUE;
528 }
530 NR::Point const button_w(event->button.x,
531 event->button.y);
532 NR::Point const button_dt(desktop->w2d(button_w));
533 sp_dyna_draw_reset(dc, button_dt);
534 sp_dyna_draw_extinput(dc, event);
535 sp_dyna_draw_apply(dc, button_dt);
536 sp_curve_reset(dc->accumulated);
537 if (dc->repr) {
538 dc->repr = NULL;
539 }
541 /* initialize first point */
542 dc->npoints = 0;
544 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
545 ( GDK_KEY_PRESS_MASK |
546 GDK_BUTTON_RELEASE_MASK |
547 GDK_POINTER_MOTION_MASK |
548 GDK_BUTTON_PRESS_MASK ),
549 NULL,
550 event->button.time);
552 ret = TRUE;
554 dc->is_drawing = true;
555 }
556 break;
557 case GDK_MOTION_NOTIFY:
558 if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
559 dc->dragging = TRUE;
561 NR::Point const motion_w(event->motion.x,
562 event->motion.y);
563 NR::Point const motion_dt(desktop->w2d(motion_w));
565 sp_dyna_draw_extinput(dc, event);
566 if (!sp_dyna_draw_apply(dc, motion_dt)) {
567 ret = TRUE;
568 break;
569 }
571 if ( dc->cur != dc->last ) {
572 sp_dyna_draw_brush(dc);
573 g_assert( dc->npoints > 0 );
574 fit_and_split(dc, FALSE);
575 }
576 ret = TRUE;
577 }
578 break;
580 case GDK_BUTTON_RELEASE:
581 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
582 dc->is_drawing = false;
584 if ( dc->dragging && event->button.button == 1 ) {
585 dc->dragging = FALSE;
587 NR::Point const motion_w(event->button.x, event->button.y);
588 NR::Point const motion_dt(desktop->w2d(motion_w));
589 sp_dyna_draw_apply(dc, motion_dt);
591 /* Remove all temporary line segments */
592 while (dc->segments) {
593 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
594 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
595 }
596 /* Create object */
597 fit_and_split(dc, TRUE);
598 accumulate_calligraphic(dc);
599 set_to_accumulated(dc); /* temporal implementation */
600 /* reset accumulated curve */
601 sp_curve_reset(dc->accumulated);
602 clear_current(dc);
603 if (dc->repr) {
604 dc->repr = NULL;
605 }
606 ret = TRUE;
607 }
608 break;
609 case GDK_KEY_PRESS:
610 switch (get_group0_keyval (&event->key)) {
611 case GDK_Up:
612 case GDK_KP_Up:
613 if (!MOD__CTRL_ONLY) {
614 dc->angle += 5.0;
615 if (dc->angle > 90.0)
616 dc->angle = 90.0;
617 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
618 ret = TRUE;
619 }
620 break;
621 case GDK_Down:
622 case GDK_KP_Down:
623 if (!MOD__CTRL_ONLY) {
624 dc->angle -= 5.0;
625 if (dc->angle < -90.0)
626 dc->angle = -90.0;
627 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
628 ret = TRUE;
629 }
630 break;
631 case GDK_Right:
632 case GDK_KP_Right:
633 if (!MOD__CTRL_ONLY) {
634 dc->width += 0.01;
635 if (dc->width > 1.0)
636 dc->width = 1.0;
637 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
638 ret = TRUE;
639 }
640 break;
641 case GDK_Left:
642 case GDK_KP_Left:
643 if (!MOD__CTRL_ONLY) {
644 dc->width -= 0.01;
645 if (dc->width < 0.01)
646 dc->width = 0.01;
647 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
648 ret = TRUE;
649 }
650 break;
651 case GDK_x:
652 case GDK_X:
653 if (MOD__ALT_ONLY) {
654 desktop->setToolboxFocusTo ("altx-calligraphy");
655 ret = TRUE;
656 }
657 break;
658 case GDK_Escape:
659 if (dc->is_drawing) {
660 // if drawing, cancel, otherwise pass it up for deselecting
661 calligraphic_cancel (dc);
662 ret = TRUE;
663 }
664 break;
665 case GDK_z:
666 case GDK_Z:
667 if (MOD__CTRL_ONLY && dc->is_drawing) {
668 // if drawing, cancel, otherwise pass it up for undo
669 calligraphic_cancel (dc);
670 ret = TRUE;
671 }
672 break;
673 default:
674 break;
675 }
676 default:
677 break;
678 }
680 if (!ret) {
681 if (((SPEventContextClass *) parent_class)->root_handler) {
682 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
683 }
684 }
686 return ret;
687 }
690 static void
691 clear_current(SPDynaDrawContext *dc)
692 {
693 /* reset bpath */
694 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
695 /* reset curve */
696 sp_curve_reset(dc->currentcurve);
697 sp_curve_reset(dc->cal1);
698 sp_curve_reset(dc->cal2);
699 /* reset points */
700 dc->npoints = 0;
701 }
703 static void
704 set_to_accumulated(SPDynaDrawContext *dc)
705 {
706 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
708 if (!sp_curve_empty(dc->accumulated)) {
709 NArtBpath *abp;
710 gchar *str;
712 if (!dc->repr) {
713 /* Create object */
714 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
715 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
717 /* Set style */
718 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
720 dc->repr = repr;
722 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
723 Inkscape::GC::release(dc->repr);
724 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
725 item->updateRepr();
726 if (dc->keep_selected) {
727 sp_desktop_selection(desktop)->set(dc->repr);
728 } else {
729 sp_desktop_selection(desktop)->clear();
730 }
731 }
732 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
733 str = sp_svg_write_path(abp);
734 g_assert( str != NULL );
735 g_free(abp);
736 dc->repr->setAttribute("d", str);
737 g_free(str);
738 } else {
739 if (dc->repr) {
740 sp_repr_unparent(dc->repr);
741 }
742 dc->repr = NULL;
743 }
745 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
746 _("Create calligraphic stroke"));
747 }
749 static void
750 add_cap(SPCurve *curve,
751 NR::Point const &pre, NR::Point const &from,
752 NR::Point const &to, NR::Point const &post,
753 double rounding)
754 {
755 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
756 double mag = NR::L2(vel);
758 NR::Point v_in = from - pre;
759 double mag_in = NR::L2(v_in);
760 if ( mag_in > DYNA_EPSILON ) {
761 v_in = mag * v_in / mag_in;
762 } else {
763 v_in = NR::Point(0, 0);
764 }
766 NR::Point v_out = to - post;
767 double mag_out = NR::L2(v_out);
768 if ( mag_out > DYNA_EPSILON ) {
769 v_out = mag * v_out / mag_out;
770 } else {
771 v_out = NR::Point(0, 0);
772 }
774 if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
775 sp_curve_curveto(curve, from + v_in, to + v_out, to);
776 }
777 }
779 static void
780 accumulate_calligraphic(SPDynaDrawContext *dc)
781 {
782 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
783 sp_curve_reset(dc->accumulated); /* Is this required ?? */
784 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
786 g_assert(dc->cal1->end > 1);
787 g_assert(rev_cal2->end > 1);
788 g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
789 g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
790 g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
791 g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
792 g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
793 g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
795 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
797 add_cap(dc->accumulated, SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(2), SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(3), SP_CURVE_SEGMENT(rev_cal2, 0)->c(3), SP_CURVE_SEGMENT(rev_cal2, 1)->c(1), dc->cap_rounding);
799 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
801 add_cap(dc->accumulated, SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(2), SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(3), SP_CURVE_SEGMENT(dc->cal1, 0)->c(3), SP_CURVE_SEGMENT(dc->cal1, 1)->c(1), dc->cap_rounding);
803 sp_curve_closepath(dc->accumulated);
805 sp_curve_unref(rev_cal2);
807 sp_curve_reset(dc->cal1);
808 sp_curve_reset(dc->cal2);
809 }
810 }
812 static double square(double const x)
813 {
814 return x * x;
815 }
817 static void
818 fit_and_split(SPDynaDrawContext *dc, gboolean release)
819 {
820 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
822 #ifdef DYNA_DRAW_VERBOSE
823 g_print("[F&S:R=%c]", release?'T':'F');
824 #endif
826 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
827 return; // just clicked
829 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
830 #define BEZIER_SIZE 4
831 #define BEZIER_MAX_BEZIERS 8
832 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
834 #ifdef DYNA_DRAW_VERBOSE
835 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
836 dc->npoints, release ? "TRUE" : "FALSE");
837 #endif
839 /* Current calligraphic */
840 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
841 /* dc->npoints > 0 */
842 /* g_print("calligraphics(1|2) reset\n"); */
843 sp_curve_reset(dc->cal1);
844 sp_curve_reset(dc->cal2);
846 sp_curve_moveto(dc->cal1, dc->point1[0]);
847 sp_curve_moveto(dc->cal2, dc->point2[0]);
848 }
850 NR::Point b1[BEZIER_MAX_LENGTH];
851 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
852 tolerance_sq, BEZIER_MAX_BEZIERS);
853 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
855 NR::Point b2[BEZIER_MAX_LENGTH];
856 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
857 tolerance_sq, BEZIER_MAX_BEZIERS);
858 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
860 if ( nb1 != -1 && nb2 != -1 ) {
861 /* Fit and draw and reset state */
862 #ifdef DYNA_DRAW_VERBOSE
863 g_print("nb1:%d nb2:%d\n", nb1, nb2);
864 #endif
865 /* CanvasShape */
866 if (! release) {
867 sp_curve_reset(dc->currentcurve);
868 sp_curve_moveto(dc->currentcurve, b1[0]);
869 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
870 sp_curve_curveto(dc->currentcurve, bp1[1],
871 bp1[2], bp1[3]);
872 }
873 sp_curve_lineto(dc->currentcurve,
874 b2[BEZIER_SIZE*(nb2-1) + 3]);
875 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
876 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
877 }
878 // FIXME: dc->segments is always NULL at this point??
879 if (!dc->segments) { // first segment
880 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
881 }
882 sp_curve_closepath(dc->currentcurve);
883 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
884 }
886 /* Current calligraphic */
887 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
888 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
889 }
890 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
891 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
892 }
893 } else {
894 /* fixme: ??? */
895 #ifdef DYNA_DRAW_VERBOSE
896 g_print("[fit_and_split] failed to fit-cubic.\n");
897 #endif
898 draw_temporary_box(dc);
900 for (gint i = 1; i < dc->npoints; i++) {
901 sp_curve_lineto(dc->cal1, dc->point1[i]);
902 }
903 for (gint i = 1; i < dc->npoints; i++) {
904 sp_curve_lineto(dc->cal2, dc->point2[i]);
905 }
906 }
908 /* Fit and draw and copy last point */
909 #ifdef DYNA_DRAW_VERBOSE
910 g_print("[%d]Yup\n", dc->npoints);
911 #endif
912 if (!release) {
913 g_assert(!sp_curve_empty(dc->currentcurve));
915 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
916 SP_TYPE_CANVAS_BPATH,
917 NULL);
918 SPCurve *curve = sp_curve_copy(dc->currentcurve);
919 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
920 sp_curve_unref(curve);
922 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
923 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
924 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
925 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
926 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
927 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
928 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
929 //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);
930 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
931 /* fixme: Cannot we cascade it to root more clearly? */
932 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
934 dc->segments = g_slist_prepend(dc->segments, cbp);
935 }
937 dc->point1[0] = dc->point1[dc->npoints - 1];
938 dc->point2[0] = dc->point2[dc->npoints - 1];
939 dc->npoints = 1;
940 } else {
941 draw_temporary_box(dc);
942 }
943 }
945 static void
946 draw_temporary_box(SPDynaDrawContext *dc)
947 {
948 sp_curve_reset(dc->currentcurve);
950 sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
951 for (gint i = dc->npoints-2; i >= 0; i--) {
952 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
953 }
954 for (gint i = 0; i < dc->npoints; i++) {
955 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
956 }
957 if (dc->npoints >= 2) {
958 add_cap(dc->currentcurve, dc->point2[dc->npoints-2], dc->point2[dc->npoints-1], dc->point1[dc->npoints-1], dc->point1[dc->npoints-2], dc->cap_rounding);
959 }
961 sp_curve_closepath(dc->currentcurve);
962 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
963 }
965 /*
966 Local Variables:
967 mode:c++
968 c-file-style:"stroustrup"
969 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
970 indent-tabs-mode:nil
971 fill-column:99
972 End:
973 */
974 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :