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>
31 #include "svg/svg.h"
32 #include "display/canvas-bpath.h"
33 #include "display/bezier-utils.h"
35 #include <glib/gmem.h>
36 #include "macros.h"
37 #include "document.h"
38 #include "selection.h"
39 #include "desktop.h"
40 #include "desktop-events.h"
41 #include "desktop-handles.h"
42 #include "desktop-affine.h"
43 #include "desktop-style.h"
44 #include "message-context.h"
45 #include "pixmaps/cursor-calligraphy.xpm"
46 #include "pixmaps/cursor-calligraphy.pixbuf"
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
61 #define DYNA_EPSILON 0.5e-2
63 #define DYNA_MIN_WIDTH 1.0e-6
65 #define DRAG_MIN 0.0
66 #define DRAG_DEFAULT 1.0
67 #define DRAG_MAX 1.0
69 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
70 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
71 static void sp_dyna_draw_context_dispose(GObject *object);
73 static void sp_dyna_draw_context_setup(SPEventContext *ec);
74 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
75 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
77 static void clear_current(SPDynaDrawContext *dc);
78 static void set_to_accumulated(SPDynaDrawContext *dc);
79 static void add_cap(SPCurve *curve, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::Point const &post, double rounding);
80 static void accumulate_calligraphic(SPDynaDrawContext *dc);
82 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
84 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
85 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
86 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
87 static void draw_temporary_box(SPDynaDrawContext *dc);
90 static SPEventContextClass *parent_class;
92 GtkType
93 sp_dyna_draw_context_get_type(void)
94 {
95 static GType type = 0;
96 if (!type) {
97 GTypeInfo info = {
98 sizeof(SPDynaDrawContextClass),
99 NULL, NULL,
100 (GClassInitFunc) sp_dyna_draw_context_class_init,
101 NULL, NULL,
102 sizeof(SPDynaDrawContext),
103 4,
104 (GInstanceInitFunc) sp_dyna_draw_context_init,
105 NULL, /* value_table */
106 };
107 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
108 }
109 return type;
110 }
112 static void
113 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
114 {
115 GObjectClass *object_class = (GObjectClass *) klass;
116 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
118 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
120 object_class->dispose = sp_dyna_draw_context_dispose;
122 event_context_class->setup = sp_dyna_draw_context_setup;
123 event_context_class->set = sp_dyna_draw_context_set;
124 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
125 }
127 static void
128 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
129 {
130 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
132 event_context->cursor_shape = cursor_calligraphy_xpm;
133 event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
134 -1,
135 cursor_calligraphy_pixbuf,
136 FALSE,
137 NULL);
138 event_context->hot_x = 4;
139 event_context->hot_y = 4;
141 ddc->accumulated = NULL;
142 ddc->segments = NULL;
143 ddc->currentcurve = NULL;
144 ddc->currentshape = NULL;
145 ddc->npoints = 0;
146 ddc->cal1 = NULL;
147 ddc->cal2 = NULL;
148 ddc->repr = NULL;
150 /* DynaDraw values */
151 ddc->cur = NR::Point(0,0);
152 ddc->last = NR::Point(0,0);
153 ddc->vel = NR::Point(0,0);
154 ddc->acc = NR::Point(0,0);
155 ddc->ang = NR::Point(0,0);
156 ddc->del = NR::Point(0,0);
158 /* attributes */
159 ddc->dragging = FALSE;
161 ddc->mass = 0.3;
162 ddc->drag = DRAG_DEFAULT;
163 ddc->angle = 30.0;
164 ddc->width = 0.2;
166 ddc->vel_thin = 0.1;
167 ddc->flatness = 0.9;
168 ddc->cap_rounding = 0.0;
170 ddc->abs_width = false;
171 ddc->keep_selected = true;
172 }
174 static void
175 sp_dyna_draw_context_dispose(GObject *object)
176 {
177 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
179 if (ddc->accumulated) {
180 ddc->accumulated = sp_curve_unref(ddc->accumulated);
181 }
183 while (ddc->segments) {
184 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
185 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
186 }
188 if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
189 if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
190 if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
192 if (ddc->currentshape) {
193 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
194 ddc->currentshape = NULL;
195 }
197 if (ddc->_message_context) {
198 delete ddc->_message_context;
199 }
201 G_OBJECT_CLASS(parent_class)->dispose(object);
202 }
204 static void
205 sp_dyna_draw_context_setup(SPEventContext *ec)
206 {
207 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
209 if (((SPEventContextClass *) parent_class)->setup)
210 ((SPEventContextClass *) parent_class)->setup(ec);
212 ddc->accumulated = sp_curve_new_sized(32);
213 ddc->currentcurve = sp_curve_new_sized(4);
215 ddc->cal1 = sp_curve_new_sized(32);
216 ddc->cal2 = sp_curve_new_sized(32);
218 ddc->currentshape = sp_canvas_item_new(sp_desktop_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, "wiggle");
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, "tremor");
230 sp_event_context_read(ec, "flatness");
231 sp_event_context_read(ec, "usepressure");
232 sp_event_context_read(ec, "usetilt");
233 sp_event_context_read(ec, "abs_width");
234 sp_event_context_read(ec, "keep_selected");
235 sp_event_context_read(ec, "cap_rounding");
237 ddc->is_drawing = false;
239 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
240 }
242 static void
243 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
244 {
245 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
247 if (!strcmp(key, "mass")) {
248 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
249 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
250 } else if (!strcmp(key, "wiggle")) {
251 double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
252 ddc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
253 } else if (!strcmp(key, "angle")) {
254 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
255 ddc->angle = CLAMP (dval, -90, 90);
256 } else if (!strcmp(key, "width")) {
257 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
258 ddc->width = CLAMP(dval, -1000.0, 1000.0);
259 } else if (!strcmp(key, "thinning")) {
260 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
261 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
262 } else if (!strcmp(key, "tremor")) {
263 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
264 ddc->tremor = CLAMP(dval, 0.0, 1.0);
265 } else if (!strcmp(key, "flatness")) {
266 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
267 ddc->flatness = CLAMP(dval, 0, 1.0);
268 } else if (!strcmp(key, "usepressure")) {
269 ddc->usepressure = (val && strcmp(val, "0"));
270 } else if (!strcmp(key, "usetilt")) {
271 ddc->usetilt = (val && strcmp(val, "0"));
272 } else if (!strcmp(key, "abs_width")) {
273 ddc->abs_width = (val && strcmp(val, "0"));
274 } else if (!strcmp(key, "keep_selected")) {
275 ddc->keep_selected = (val && strcmp(val, "0"));
276 } else if (!strcmp(key, "cap_rounding")) {
277 ddc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
278 }
280 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
281 }
283 static double
284 flerp(double f0, double f1, double p)
285 {
286 return f0 + ( f1 - f0 ) * p;
287 }
289 /* Get normalized point */
290 static NR::Point
291 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
292 {
293 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
294 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
295 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
296 }
298 /* Get view point */
299 static NR::Point
300 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
301 {
302 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
303 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
304 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
305 }
307 static void
308 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
309 {
310 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
311 dc->vel = NR::Point(0,0);
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 ) {
349 return FALSE;
350 }
352 dc->acc = force / mass;
354 /* Calculate new velocity */
355 dc->vel += dc->acc;
357 /* Calculate angle of drawing tool */
359 double a1;
360 if (dc->usetilt) {
361 // 1a. calculate nib angle from input device tilt:
362 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
364 if (length > 0) {
365 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
366 a1 = atan2(ang1);
367 }
368 else
369 a1 = 0.0;
370 }
371 else {
372 // 1b. fixed dc->angle (absolutely flat nib):
373 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
374 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
375 a1 = atan2(ang1);
376 }
378 // 2. perpendicular to dc->vel (absolutely non-flat nib):
379 gdouble const mag_vel = NR::L2(dc->vel);
380 if ( mag_vel < DYNA_EPSILON ) {
381 return FALSE;
382 }
383 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
385 // 3. Average them using flatness parameter:
386 // calculate angles
387 double a2 = atan2(ang2);
388 // flip a2 to force it to be in the same half-circle as a1
389 bool flipped = false;
390 if (fabs (a2-a1) > 0.5*M_PI) {
391 a2 += M_PI;
392 flipped = true;
393 }
394 // normalize a2
395 if (a2 > M_PI)
396 a2 -= 2*M_PI;
397 if (a2 < -M_PI)
398 a2 += 2*M_PI;
399 // find the flatness-weighted bisector angle, unflip if a2 was flipped
400 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
401 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
402 // convert to point
403 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
405 /* Apply drag */
406 dc->vel *= 1.0 - drag;
408 /* Update position */
409 dc->last = dc->cur;
410 dc->cur += dc->vel;
412 return TRUE;
413 }
415 static void
416 sp_dyna_draw_brush(SPDynaDrawContext *dc)
417 {
418 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
420 // How much velocity thins strokestyle
421 double vel_thin = flerp (0, 160, dc->vel_thin);
423 // Influence of pressure on thickness
424 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
426 double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
428 double tremble_left = 0, tremble_right = 0;
429 if (dc->tremor > 0) {
430 // obtain two normally distributed random variables, using polar Box-Muller transform
431 double x1, x2, w, y1, y2;
432 do {
433 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
434 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
435 w = x1 * x1 + x2 * x2;
436 } while ( w >= 1.0 );
437 w = sqrt( (-2.0 * log( w ) ) / w );
438 y1 = x1 * w;
439 y2 = x2 * w;
441 // deflect both left and right edges randomly and independently, so that:
442 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
443 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
444 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
445 // comparatively smooth and slow ones excessively jittery
446 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
447 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
448 }
450 if ( width < 0.02 * dc->width ) {
451 width = 0.02 * dc->width;
452 }
454 double dezoomify_factor = 0.05 * 1000;
455 if (!dc->abs_width) {
456 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
457 }
459 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
460 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
462 NR::Point abs_middle = sp_dyna_draw_get_vpoint(dc, dc->cur);
464 dc->point1[dc->npoints] = abs_middle + del_left;
465 dc->point2[dc->npoints] = abs_middle - del_right;
467 dc->del = 0.5*(del_left + del_right);
469 dc->npoints++;
470 }
472 void
473 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
474 {
475 desktop->setToolboxAdjustmentValue (id, value);
476 }
478 gint
479 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
480 GdkEvent *event)
481 {
482 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
483 SPDesktop *desktop = event_context->desktop;
485 gint ret = FALSE;
487 switch (event->type) {
488 case GDK_BUTTON_PRESS:
489 if ( event->button.button == 1 ) {
491 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
493 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
494 return TRUE;
495 }
497 NR::Point const button_w(event->button.x,
498 event->button.y);
499 NR::Point const button_dt(desktop->w2d(button_w));
500 sp_dyna_draw_reset(dc, button_dt);
501 sp_dyna_draw_extinput(dc, event);
502 sp_dyna_draw_apply(dc, button_dt);
503 sp_curve_reset(dc->accumulated);
504 if (dc->repr) {
505 dc->repr = NULL;
506 }
508 /* initialize first point */
509 dc->npoints = 0;
511 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
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 ret = TRUE;
521 dc->is_drawing = true;
522 }
523 break;
524 case GDK_MOTION_NOTIFY:
525 if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
526 dc->dragging = TRUE;
528 NR::Point const motion_w(event->motion.x,
529 event->motion.y);
530 NR::Point const motion_dt(desktop->w2d(motion_w));
532 sp_dyna_draw_extinput(dc, event);
533 if (!sp_dyna_draw_apply(dc, motion_dt)) {
534 ret = TRUE;
535 break;
536 }
538 if ( dc->cur != dc->last ) {
539 sp_dyna_draw_brush(dc);
540 g_assert( dc->npoints > 0 );
541 fit_and_split(dc, FALSE);
542 }
543 ret = TRUE;
544 }
545 break;
547 case GDK_BUTTON_RELEASE:
548 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
549 dc->is_drawing = false;
551 if ( dc->dragging && event->button.button == 1 ) {
552 dc->dragging = FALSE;
554 NR::Point const motion_w(event->button.x, event->button.y);
555 NR::Point const motion_dt(desktop->w2d(motion_w));
556 sp_dyna_draw_apply(dc, motion_dt);
558 /* Remove all temporary line segments */
559 while (dc->segments) {
560 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
561 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
562 }
563 /* Create object */
564 fit_and_split(dc, TRUE);
565 accumulate_calligraphic(dc);
566 set_to_accumulated(dc); /* temporal implementation */
567 /* reset accumulated curve */
568 sp_curve_reset(dc->accumulated);
569 clear_current(dc);
570 if (dc->repr) {
571 dc->repr = NULL;
572 }
573 ret = TRUE;
574 }
575 break;
576 case GDK_KEY_PRESS:
577 switch (get_group0_keyval (&event->key)) {
578 case GDK_Up:
579 case GDK_KP_Up:
580 if (!MOD__CTRL_ONLY) {
581 dc->angle += 5.0;
582 if (dc->angle > 90.0)
583 dc->angle = 90.0;
584 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
585 ret = TRUE;
586 }
587 break;
588 case GDK_Down:
589 case GDK_KP_Down:
590 if (!MOD__CTRL_ONLY) {
591 dc->angle -= 5.0;
592 if (dc->angle < -90.0)
593 dc->angle = -90.0;
594 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
595 ret = TRUE;
596 }
597 break;
598 case GDK_Right:
599 case GDK_KP_Right:
600 if (!MOD__CTRL_ONLY) {
601 dc->width += 0.01;
602 if (dc->width > 1.0)
603 dc->width = 1.0;
604 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
605 ret = TRUE;
606 }
607 break;
608 case GDK_Left:
609 case GDK_KP_Left:
610 if (!MOD__CTRL_ONLY) {
611 dc->width -= 0.01;
612 if (dc->width < 0.01)
613 dc->width = 0.01;
614 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
615 ret = TRUE;
616 }
617 break;
618 case GDK_x:
619 case GDK_X:
620 if (MOD__ALT_ONLY) {
621 desktop->setToolboxFocusTo ("altx-calligraphy");
622 ret = TRUE;
623 }
624 break;
625 case GDK_Escape:
626 sp_desktop_selection(desktop)->clear();
627 break;
629 default:
630 break;
631 }
632 default:
633 break;
634 }
636 if (!ret) {
637 if (((SPEventContextClass *) parent_class)->root_handler) {
638 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
639 }
640 }
642 return ret;
643 }
646 static void
647 clear_current(SPDynaDrawContext *dc)
648 {
649 /* reset bpath */
650 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
651 /* reset curve */
652 sp_curve_reset(dc->currentcurve);
653 sp_curve_reset(dc->cal1);
654 sp_curve_reset(dc->cal2);
655 /* reset points */
656 dc->npoints = 0;
657 }
659 static void
660 set_to_accumulated(SPDynaDrawContext *dc)
661 {
662 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
664 if (!sp_curve_empty(dc->accumulated)) {
665 NArtBpath *abp;
666 gchar *str;
668 if (!dc->repr) {
669 /* Create object */
670 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
672 /* Set style */
673 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
675 dc->repr = repr;
677 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
678 Inkscape::GC::release(dc->repr);
679 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
680 item->updateRepr();
681 if (dc->keep_selected) {
682 sp_desktop_selection(desktop)->set(dc->repr);
683 } else {
684 sp_desktop_selection(desktop)->clear();
685 }
686 }
687 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
688 str = sp_svg_write_path(abp);
689 g_assert( str != NULL );
690 g_free(abp);
691 dc->repr->setAttribute("d", str);
692 g_free(str);
693 } else {
694 if (dc->repr) {
695 sp_repr_unparent(dc->repr);
696 }
697 dc->repr = NULL;
698 }
700 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
701 /* TODO: annotate */ "dyna-draw-context.cpp:689");
702 }
704 static void
705 add_cap(SPCurve *curve,
706 NR::Point const &pre, NR::Point const &from,
707 NR::Point const &to, NR::Point const &post,
708 double rounding)
709 {
710 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
711 double mag = NR::L2(vel);
713 NR::Point v_in = from - pre;
714 double mag_in = NR::L2(v_in);
715 if ( mag_in > DYNA_EPSILON ) {
716 v_in = mag * v_in / mag_in;
717 } else {
718 v_in = NR::Point(0, 0);
719 }
721 NR::Point v_out = to - post;
722 double mag_out = NR::L2(v_out);
723 if ( mag_out > DYNA_EPSILON ) {
724 v_out = mag * v_out / mag_out;
725 } else {
726 v_out = NR::Point(0, 0);
727 }
729 if ( NR::L2(v_in) > DYNA_EPSILON || NR::L2(v_out) > DYNA_EPSILON ) {
730 sp_curve_curveto(curve, from + v_in, to + v_out, to);
731 }
732 }
734 static void
735 accumulate_calligraphic(SPDynaDrawContext *dc)
736 {
737 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
738 sp_curve_reset(dc->accumulated); /* Is this required ?? */
739 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
741 g_assert(dc->cal1->end > 1);
742 g_assert(rev_cal2->end > 1);
743 g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
744 g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
745 g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
746 g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
747 g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
748 g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
750 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
752 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);
754 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
756 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);
758 sp_curve_closepath(dc->accumulated);
760 sp_curve_unref(rev_cal2);
762 sp_curve_reset(dc->cal1);
763 sp_curve_reset(dc->cal2);
764 }
765 }
767 static double square(double const x)
768 {
769 return x * x;
770 }
772 static void
773 fit_and_split(SPDynaDrawContext *dc, gboolean release)
774 {
775 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
777 #ifdef DYNA_DRAW_VERBOSE
778 g_print("[F&S:R=%c]", release?'T':'F');
779 #endif
781 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
782 return; // just clicked
784 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
785 #define BEZIER_SIZE 4
786 #define BEZIER_MAX_BEZIERS 8
787 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
789 #ifdef DYNA_DRAW_VERBOSE
790 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
791 dc->npoints, release ? "TRUE" : "FALSE");
792 #endif
794 /* Current calligraphic */
795 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
796 /* dc->npoints > 0 */
797 /* g_print("calligraphics(1|2) reset\n"); */
798 sp_curve_reset(dc->cal1);
799 sp_curve_reset(dc->cal2);
801 sp_curve_moveto(dc->cal1, dc->point1[0]);
802 sp_curve_moveto(dc->cal2, dc->point2[0]);
803 }
805 NR::Point b1[BEZIER_MAX_LENGTH];
806 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
807 tolerance_sq, BEZIER_MAX_BEZIERS);
808 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
810 NR::Point b2[BEZIER_MAX_LENGTH];
811 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
812 tolerance_sq, BEZIER_MAX_BEZIERS);
813 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
815 if ( nb1 != -1 && nb2 != -1 ) {
816 /* Fit and draw and reset state */
817 #ifdef DYNA_DRAW_VERBOSE
818 g_print("nb1:%d nb2:%d\n", nb1, nb2);
819 #endif
820 /* CanvasShape */
821 if (! release) {
822 sp_curve_reset(dc->currentcurve);
823 sp_curve_moveto(dc->currentcurve, b1[0]);
824 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
825 sp_curve_curveto(dc->currentcurve, bp1[1],
826 bp1[2], bp1[3]);
827 }
828 sp_curve_lineto(dc->currentcurve,
829 b2[BEZIER_SIZE*(nb2-1) + 3]);
830 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
831 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
832 }
833 // FIXME: dc->segments is always NULL at this point??
834 if (!dc->segments) { // first segment
835 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
836 }
837 sp_curve_closepath(dc->currentcurve);
838 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
839 }
841 /* Current calligraphic */
842 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
843 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
844 }
845 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
846 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
847 }
848 } else {
849 /* fixme: ??? */
850 #ifdef DYNA_DRAW_VERBOSE
851 g_print("[fit_and_split] failed to fit-cubic.\n");
852 #endif
853 draw_temporary_box(dc);
855 for (gint i = 1; i < dc->npoints; i++) {
856 sp_curve_lineto(dc->cal1, dc->point1[i]);
857 }
858 for (gint i = 1; i < dc->npoints; i++) {
859 sp_curve_lineto(dc->cal2, dc->point2[i]);
860 }
861 }
863 /* Fit and draw and copy last point */
864 #ifdef DYNA_DRAW_VERBOSE
865 g_print("[%d]Yup\n", dc->npoints);
866 #endif
867 if (!release) {
868 g_assert(!sp_curve_empty(dc->currentcurve));
870 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
871 SP_TYPE_CANVAS_BPATH,
872 NULL);
873 SPCurve *curve = sp_curve_copy(dc->currentcurve);
874 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
875 sp_curve_unref(curve);
877 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
878 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
879 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
880 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
881 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
882 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
883 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
884 //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);
885 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
886 /* fixme: Cannot we cascade it to root more clearly? */
887 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
889 dc->segments = g_slist_prepend(dc->segments, cbp);
890 }
892 dc->point1[0] = dc->point1[dc->npoints - 1];
893 dc->point2[0] = dc->point2[dc->npoints - 1];
894 dc->npoints = 1;
895 } else {
896 draw_temporary_box(dc);
897 }
898 }
900 static void
901 draw_temporary_box(SPDynaDrawContext *dc)
902 {
903 sp_curve_reset(dc->currentcurve);
904 sp_curve_moveto(dc->currentcurve, dc->point1[0]);
905 for (gint i = 1; i < dc->npoints; i++) {
906 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
907 }
908 for (gint i = dc->npoints-1; i >= 0; i--) {
909 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
910 }
911 add_cap(dc->currentcurve, dc->point2[1], dc->point2[0], dc->point1[0], dc->point1[1], dc->cap_rounding);
912 sp_curve_closepath(dc->currentcurve);
913 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
914 }
916 /*
917 Local Variables:
918 mode:c++
919 c-file-style:"stroustrup"
920 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
921 indent-tabs-mode:nil
922 fill-column:99
923 End:
924 */
925 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :