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 <glib/gmem.h>
33 #include "macros.h"
34 #include "document.h"
35 #include "selection.h"
36 #include "desktop.h"
37 #include "desktop-events.h"
38 #include "desktop-handles.h"
39 #include "desktop-affine.h"
40 #include "desktop-style.h"
41 #include "message-context.h"
42 #include "pixmaps/cursor-calligraphy.xpm"
43 #include "pixmaps/cursor-calligraphy.pixbuf"
44 #include "dyna-draw-context.h"
45 #include "libnr/n-art-bpath.h"
46 #include "libnr/nr-path.h"
47 #include "xml/repr.h"
48 #include "context-fns.h"
49 #include "sp-item.h"
50 #include "inkscape.h"
51 #include "color.h"
53 #define DDC_RED_RGBA 0xff0000ff
55 #define SAMPLE_TIMEOUT 10
56 #define TOLERANCE_LINE 1.0
57 #define TOLERANCE_CALLIGRAPHIC 3.0
58 #define DYNA_EPSILON 1.0e-6
60 #define DYNA_MIN_WIDTH 1.0e-6
62 #define DRAG_MIN 0.0
63 #define DRAG_DEFAULT 1.0
64 #define DRAG_MAX 1.0
66 static void sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass);
67 static void sp_dyna_draw_context_init(SPDynaDrawContext *ddc);
68 static void sp_dyna_draw_context_dispose(GObject *object);
70 static void sp_dyna_draw_context_setup(SPEventContext *ec);
71 static void sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
72 static gint sp_dyna_draw_context_root_handler(SPEventContext *ec, GdkEvent *event);
74 static void clear_current(SPDynaDrawContext *dc);
75 static void set_to_accumulated(SPDynaDrawContext *dc);
76 static void accumulate_calligraphic(SPDynaDrawContext *dc);
78 static void fit_and_split(SPDynaDrawContext *ddc, gboolean release);
79 static void fit_and_split_calligraphics(SPDynaDrawContext *ddc, gboolean release);
81 static void sp_dyna_draw_reset(SPDynaDrawContext *ddc, NR::Point p);
82 static NR::Point sp_dyna_draw_get_npoint(SPDynaDrawContext const *ddc, NR::Point v);
83 static NR::Point sp_dyna_draw_get_vpoint(SPDynaDrawContext const *ddc, NR::Point n);
84 static void draw_temporary_box(SPDynaDrawContext *dc);
87 static SPEventContextClass *parent_class;
89 GtkType
90 sp_dyna_draw_context_get_type(void)
91 {
92 static GType type = 0;
93 if (!type) {
94 GTypeInfo info = {
95 sizeof(SPDynaDrawContextClass),
96 NULL, NULL,
97 (GClassInitFunc) sp_dyna_draw_context_class_init,
98 NULL, NULL,
99 sizeof(SPDynaDrawContext),
100 4,
101 (GInstanceInitFunc) sp_dyna_draw_context_init,
102 NULL, /* value_table */
103 };
104 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPDynaDrawContext", &info, (GTypeFlags)0);
105 }
106 return type;
107 }
109 static void
110 sp_dyna_draw_context_class_init(SPDynaDrawContextClass *klass)
111 {
112 GObjectClass *object_class = (GObjectClass *) klass;
113 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
115 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
117 object_class->dispose = sp_dyna_draw_context_dispose;
119 event_context_class->setup = sp_dyna_draw_context_setup;
120 event_context_class->set = sp_dyna_draw_context_set;
121 event_context_class->root_handler = sp_dyna_draw_context_root_handler;
122 }
124 static void
125 sp_dyna_draw_context_init(SPDynaDrawContext *ddc)
126 {
127 SPEventContext *event_context = SP_EVENT_CONTEXT(ddc);
129 event_context->cursor_shape = cursor_calligraphy_xpm;
130 event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
131 -1,
132 cursor_calligraphy_pixbuf,
133 FALSE,
134 NULL);
135 event_context->hot_x = 4;
136 event_context->hot_y = 4;
138 ddc->accumulated = NULL;
139 ddc->segments = NULL;
140 ddc->currentcurve = NULL;
141 ddc->currentshape = NULL;
142 ddc->npoints = 0;
143 ddc->cal1 = NULL;
144 ddc->cal2 = NULL;
145 ddc->repr = NULL;
147 /* DynaDraw values */
148 ddc->cur = NR::Point(0,0);
149 ddc->last = NR::Point(0,0);
150 ddc->vel = NR::Point(0,0);
151 ddc->acc = NR::Point(0,0);
152 ddc->ang = NR::Point(0,0);
153 ddc->del = NR::Point(0,0);
155 /* attributes */
156 ddc->dragging = FALSE;
158 ddc->mass = 0.3;
159 ddc->drag = DRAG_DEFAULT;
160 ddc->angle = 30.0;
161 ddc->width = 0.2;
163 ddc->vel_thin = 0.1;
164 ddc->flatness = 0.9;
166 ddc->abs_width = false;
167 ddc->keep_selected = true;
168 }
170 static void
171 sp_dyna_draw_context_dispose(GObject *object)
172 {
173 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(object);
175 if (ddc->accumulated) {
176 ddc->accumulated = sp_curve_unref(ddc->accumulated);
177 }
179 while (ddc->segments) {
180 gtk_object_destroy(GTK_OBJECT(ddc->segments->data));
181 ddc->segments = g_slist_remove(ddc->segments, ddc->segments->data);
182 }
184 if (ddc->currentcurve) ddc->currentcurve = sp_curve_unref(ddc->currentcurve);
185 if (ddc->cal1) ddc->cal1 = sp_curve_unref(ddc->cal1);
186 if (ddc->cal2) ddc->cal2 = sp_curve_unref(ddc->cal2);
188 if (ddc->currentshape) {
189 gtk_object_destroy(GTK_OBJECT(ddc->currentshape));
190 ddc->currentshape = NULL;
191 }
193 if (ddc->_message_context) {
194 delete ddc->_message_context;
195 }
197 G_OBJECT_CLASS(parent_class)->dispose(object);
198 }
200 static void
201 sp_dyna_draw_context_setup(SPEventContext *ec)
202 {
203 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
205 if (((SPEventContextClass *) parent_class)->setup)
206 ((SPEventContextClass *) parent_class)->setup(ec);
208 ddc->accumulated = sp_curve_new_sized(32);
209 ddc->currentcurve = sp_curve_new_sized(4);
211 ddc->cal1 = sp_curve_new_sized(32);
212 ddc->cal2 = sp_curve_new_sized(32);
214 ddc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
215 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(ddc->currentshape), DDC_RED_RGBA, SP_WIND_RULE_EVENODD);
216 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(ddc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
217 /* fixme: Cannot we cascade it to root more clearly? */
218 g_signal_connect(G_OBJECT(ddc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
220 sp_event_context_read(ec, "mass");
221 sp_event_context_read(ec, "drag");
222 sp_event_context_read(ec, "angle");
223 sp_event_context_read(ec, "width");
224 sp_event_context_read(ec, "thinning");
225 sp_event_context_read(ec, "tremor");
226 sp_event_context_read(ec, "flatness");
227 sp_event_context_read(ec, "usepressure");
228 sp_event_context_read(ec, "usetilt");
229 sp_event_context_read(ec, "abs_width");
230 sp_event_context_read(ec, "keep_selected");
232 ddc->is_drawing = false;
234 ddc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
235 }
237 static void
238 sp_dyna_draw_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
239 {
240 SPDynaDrawContext *ddc = SP_DYNA_DRAW_CONTEXT(ec);
242 if (!strcmp(key, "mass")) {
243 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
244 ddc->mass = CLAMP(dval, -1000.0, 1000.0);
245 } else if (!strcmp(key, "drag")) {
246 double const dval = ( val ? g_ascii_strtod (val, NULL) : DRAG_DEFAULT );
247 ddc->drag = CLAMP(dval, DRAG_MIN, DRAG_MAX);
248 } else if (!strcmp(key, "angle")) {
249 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
250 ddc->angle = CLAMP (dval, -90, 90);
251 } else if (!strcmp(key, "width")) {
252 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
253 ddc->width = CLAMP(dval, -1000.0, 1000.0);
254 } else if (!strcmp(key, "thinning")) {
255 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
256 ddc->vel_thin = CLAMP(dval, -1.0, 1.0);
257 } else if (!strcmp(key, "tremor")) {
258 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
259 ddc->tremor = CLAMP(dval, 0.0, 1.0);
260 } else if (!strcmp(key, "flatness")) {
261 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
262 ddc->flatness = CLAMP(dval, 0, 1.0);
263 } else if (!strcmp(key, "usepressure")) {
264 ddc->usepressure = (val && strcmp(val, "0"));
265 } else if (!strcmp(key, "usetilt")) {
266 ddc->usetilt = (val && strcmp(val, "0"));
267 } else if (!strcmp(key, "abs_width")) {
268 ddc->abs_width = (val && strcmp(val, "0"));
269 } else if (!strcmp(key, "keep_selected")) {
270 ddc->keep_selected = (val && strcmp(val, "0"));
271 }
273 //g_print("DDC: %g %g %g %g\n", ddc->mass, ddc->drag, ddc->angle, ddc->width);
274 }
276 static double
277 flerp(double f0, double f1, double p)
278 {
279 return f0 + ( f1 - f0 ) * p;
280 }
282 /* Get normalized point */
283 static NR::Point
284 sp_dyna_draw_get_npoint(SPDynaDrawContext const *dc, NR::Point v)
285 {
286 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
287 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
288 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
289 }
291 /* Get view point */
292 static NR::Point
293 sp_dyna_draw_get_vpoint(SPDynaDrawContext const *dc, NR::Point n)
294 {
295 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
296 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
297 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
298 }
300 static void
301 sp_dyna_draw_reset(SPDynaDrawContext *dc, NR::Point p)
302 {
303 dc->last = dc->cur = sp_dyna_draw_get_npoint(dc, p);
304 dc->vel = NR::Point(0,0);
305 dc->acc = NR::Point(0,0);
306 dc->ang = NR::Point(0,0);
307 dc->del = NR::Point(0,0);
308 }
310 static void
311 sp_dyna_draw_extinput(SPDynaDrawContext *dc, GdkEvent *event)
312 {
313 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
314 dc->pressure = CLAMP (dc->pressure, DDC_MIN_PRESSURE, DDC_MAX_PRESSURE);
315 else
316 dc->pressure = DDC_DEFAULT_PRESSURE;
318 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
319 dc->xtilt = CLAMP (dc->xtilt, DDC_MIN_TILT, DDC_MAX_TILT);
320 else
321 dc->xtilt = DDC_DEFAULT_TILT;
323 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
324 dc->ytilt = CLAMP (dc->ytilt, DDC_MIN_TILT, DDC_MAX_TILT);
325 else
326 dc->ytilt = DDC_DEFAULT_TILT;
327 }
330 static gboolean
331 sp_dyna_draw_apply(SPDynaDrawContext *dc, NR::Point p)
332 {
333 NR::Point n = sp_dyna_draw_get_npoint(dc, p);
335 /* Calculate mass and drag */
336 double const mass = flerp(1.0, 160.0, dc->mass);
337 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
339 /* Calculate force and acceleration */
340 NR::Point force = n - dc->cur;
341 if ( NR::L2(force) < DYNA_EPSILON ) {
342 return FALSE;
343 }
345 dc->acc = force / mass;
347 /* Calculate new velocity */
348 dc->vel += dc->acc;
350 /* Calculate angle of drawing tool */
352 double a1;
353 if (dc->usetilt) {
354 // 1a. calculate nib angle from input device tilt:
355 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
357 if (length > 0) {
358 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
359 a1 = atan2(ang1);
360 }
361 else
362 a1 = 0.0;
363 }
364 else {
365 // 1b. fixed dc->angle (absolutely flat nib):
366 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
367 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
368 a1 = atan2(ang1);
369 }
371 // 2. perpendicular to dc->vel (absolutely non-flat nib):
372 gdouble const mag_vel = NR::L2(dc->vel);
373 if ( mag_vel < DYNA_EPSILON ) {
374 return FALSE;
375 }
376 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
378 // 3. Average them using flatness parameter:
379 // calculate angles
380 double a2 = atan2(ang2);
381 // flip a2 to force it to be in the same half-circle as a1
382 bool flipped = false;
383 if (fabs (a2-a1) > 0.5*M_PI) {
384 a2 += M_PI;
385 flipped = true;
386 }
387 // normalize a2
388 if (a2 > M_PI)
389 a2 -= 2*M_PI;
390 if (a2 < -M_PI)
391 a2 += 2*M_PI;
392 // find the flatness-weighted bisector angle, unflip if a2 was flipped
393 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
394 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
395 // convert to point
396 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
398 /* Apply drag */
399 dc->vel *= 1.0 - drag;
401 /* Update position */
402 dc->last = dc->cur;
403 dc->cur += dc->vel;
405 return TRUE;
406 }
408 static void
409 sp_dyna_draw_brush(SPDynaDrawContext *dc)
410 {
411 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
413 // How much velocity thins strokestyle
414 double vel_thin = flerp (0, 160, dc->vel_thin);
416 // Influence of pressure on thickness
417 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
419 double width = ( pressure_thick - vel_thin * NR::L2(dc->vel) ) * dc->width;
421 double tremble_left = 0, tremble_right = 0;
422 if (dc->tremor > 0) {
423 // obtain two normally distributed random variables, using polar Box-Muller transform
424 double x1, x2, w, y1, y2;
425 do {
426 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
427 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
428 w = x1 * x1 + x2 * x2;
429 } while ( w >= 1.0 );
430 w = sqrt( (-2.0 * log( w ) ) / w );
431 y1 = x1 * w;
432 y2 = x2 * w;
434 // deflect both left and right edges randomly and independently, so that:
435 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
436 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
437 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
438 // comparatively smooth and slow ones excessively jittery
439 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
440 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
441 }
443 if ( width < 0.02 * dc->width ) {
444 width = 0.02 * dc->width;
445 }
447 double dezoomify_factor = 0.05 * 1000;
448 if (!dc->abs_width) {
449 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
450 }
452 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
453 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
455 NR::Point abs_middle = sp_dyna_draw_get_vpoint(dc, dc->cur);
457 dc->point1[dc->npoints] = abs_middle + del_left;
458 dc->point2[dc->npoints] = abs_middle - del_right;
460 dc->del = 0.5*(del_left + del_right);
462 dc->npoints++;
463 }
465 void
466 sp_ddc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
467 {
468 desktop->setToolboxAdjustmentValue (id, value);
469 }
471 gint
472 sp_dyna_draw_context_root_handler(SPEventContext *event_context,
473 GdkEvent *event)
474 {
475 SPDynaDrawContext *dc = SP_DYNA_DRAW_CONTEXT(event_context);
476 SPDesktop *desktop = event_context->desktop;
478 gint ret = FALSE;
480 switch (event->type) {
481 case GDK_BUTTON_PRESS:
482 if ( event->button.button == 1 ) {
484 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
486 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
487 return TRUE;
488 }
490 NR::Point const button_w(event->button.x,
491 event->button.y);
492 NR::Point const button_dt(desktop->w2d(button_w));
493 sp_dyna_draw_reset(dc, button_dt);
494 sp_dyna_draw_extinput(dc, event);
495 sp_dyna_draw_apply(dc, button_dt);
496 sp_curve_reset(dc->accumulated);
497 if (dc->repr) {
498 dc->repr = NULL;
499 }
501 /* initialize first point */
502 dc->npoints = 0;
504 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
505 ( GDK_KEY_PRESS_MASK |
506 GDK_BUTTON_RELEASE_MASK |
507 GDK_POINTER_MOTION_MASK |
508 GDK_BUTTON_PRESS_MASK ),
509 NULL,
510 event->button.time);
512 ret = TRUE;
514 dc->is_drawing = true;
515 }
516 break;
517 case GDK_MOTION_NOTIFY:
518 if ( dc->is_drawing && ( event->motion.state & GDK_BUTTON1_MASK ) ) {
519 dc->dragging = TRUE;
521 NR::Point const motion_w(event->motion.x,
522 event->motion.y);
523 NR::Point const motion_dt(desktop->w2d(motion_w));
525 sp_dyna_draw_extinput(dc, event);
526 if (!sp_dyna_draw_apply(dc, motion_dt)) {
527 ret = TRUE;
528 break;
529 }
531 if ( dc->cur != dc->last ) {
532 sp_dyna_draw_brush(dc);
533 g_assert( dc->npoints > 0 );
534 fit_and_split(dc, FALSE);
535 }
536 ret = TRUE;
537 }
538 break;
540 case GDK_BUTTON_RELEASE:
541 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
542 dc->is_drawing = false;
543 if ( dc->dragging && event->button.button == 1 ) {
544 dc->dragging = FALSE;
546 /* Remove all temporary line segments */
547 while (dc->segments) {
548 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
549 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
550 }
551 /* Create object */
552 fit_and_split(dc, TRUE);
553 accumulate_calligraphic(dc);
554 set_to_accumulated(dc); /* temporal implementation */
555 /* reset accumulated curve */
556 sp_curve_reset(dc->accumulated);
557 clear_current(dc);
558 if (dc->repr) {
559 dc->repr = NULL;
560 }
561 ret = TRUE;
562 }
563 break;
564 case GDK_KEY_PRESS:
565 switch (get_group0_keyval (&event->key)) {
566 case GDK_Up:
567 case GDK_KP_Up:
568 if (!MOD__CTRL_ONLY) {
569 dc->angle += 5.0;
570 if (dc->angle > 90.0)
571 dc->angle = 90.0;
572 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
573 ret = TRUE;
574 }
575 break;
576 case GDK_Down:
577 case GDK_KP_Down:
578 if (!MOD__CTRL_ONLY) {
579 dc->angle -= 5.0;
580 if (dc->angle < -90.0)
581 dc->angle = -90.0;
582 sp_ddc_update_toolbox (desktop, "calligraphy-angle", dc->angle);
583 ret = TRUE;
584 }
585 break;
586 case GDK_Right:
587 case GDK_KP_Right:
588 if (!MOD__CTRL_ONLY) {
589 dc->width += 0.01;
590 if (dc->width > 1.0)
591 dc->width = 1.0;
592 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100); // the same spinbutton is for alt+x
593 ret = TRUE;
594 }
595 break;
596 case GDK_Left:
597 case GDK_KP_Left:
598 if (!MOD__CTRL_ONLY) {
599 dc->width -= 0.01;
600 if (dc->width < 0.01)
601 dc->width = 0.01;
602 sp_ddc_update_toolbox (desktop, "altx-calligraphy", dc->width * 100);
603 ret = TRUE;
604 }
605 break;
606 case GDK_x:
607 case GDK_X:
608 if (MOD__ALT_ONLY) {
609 desktop->setToolboxFocusTo ("altx-calligraphy");
610 ret = TRUE;
611 }
612 break;
613 case GDK_Escape:
614 sp_desktop_selection(desktop)->clear();
615 break;
617 default:
618 break;
619 }
620 default:
621 break;
622 }
624 if (!ret) {
625 if (((SPEventContextClass *) parent_class)->root_handler) {
626 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
627 }
628 }
630 return ret;
631 }
634 static void
635 clear_current(SPDynaDrawContext *dc)
636 {
637 /* reset bpath */
638 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
639 /* reset curve */
640 sp_curve_reset(dc->currentcurve);
641 sp_curve_reset(dc->cal1);
642 sp_curve_reset(dc->cal2);
643 /* reset points */
644 dc->npoints = 0;
645 }
647 static void
648 set_to_accumulated(SPDynaDrawContext *dc)
649 {
650 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
652 if (!sp_curve_empty(dc->accumulated)) {
653 NArtBpath *abp;
654 gchar *str;
656 if (!dc->repr) {
657 /* Create object */
658 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
660 /* Set style */
661 sp_desktop_apply_style_tool (desktop, repr, "tools.calligraphic", false);
663 dc->repr = repr;
665 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
666 Inkscape::GC::release(dc->repr);
667 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
668 item->updateRepr();
669 if (dc->keep_selected) {
670 sp_desktop_selection(desktop)->set(dc->repr);
671 } else {
672 sp_desktop_selection(desktop)->clear();
673 }
674 }
675 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
676 str = sp_svg_write_path(abp);
677 g_assert( str != NULL );
678 g_free(abp);
679 dc->repr->setAttribute("d", str);
680 g_free(str);
681 } else {
682 if (dc->repr) {
683 sp_repr_unparent(dc->repr);
684 }
685 dc->repr = NULL;
686 }
688 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_CALLIGRAPHIC,
689 /* TODO: annotate */ "dyna-draw-context.cpp:689");
690 }
692 static void
693 accumulate_calligraphic(SPDynaDrawContext *dc)
694 {
695 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
696 sp_curve_reset(dc->accumulated); /* Is this required ?? */
697 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
698 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
699 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
700 sp_curve_closepath(dc->accumulated);
702 sp_curve_unref(rev_cal2);
704 sp_curve_reset(dc->cal1);
705 sp_curve_reset(dc->cal2);
706 }
707 }
709 static void
710 fit_and_split(SPDynaDrawContext *dc,
711 gboolean release)
712 {
713 fit_and_split_calligraphics(dc, release);
714 }
716 static double square(double const x)
717 {
718 return x * x;
719 }
721 static void
722 fit_and_split_calligraphics(SPDynaDrawContext *dc, gboolean release)
723 {
724 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_CALLIGRAPHIC );
726 #ifdef DYNA_DRAW_VERBOSE
727 g_print("[F&S:R=%c]", release?'T':'F');
728 #endif
730 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
731 return; // just clicked
733 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
734 #define BEZIER_SIZE 4
735 #define BEZIER_MAX_BEZIERS 8
736 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
738 #ifdef DYNA_DRAW_VERBOSE
739 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
740 dc->npoints, release ? "TRUE" : "FALSE");
741 #endif
743 /* Current calligraphic */
744 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
745 /* dc->npoints > 0 */
746 /* g_print("calligraphics(1|2) reset\n"); */
747 sp_curve_reset(dc->cal1);
748 sp_curve_reset(dc->cal2);
750 sp_curve_moveto(dc->cal1, dc->point1[0]);
751 sp_curve_moveto(dc->cal2, dc->point2[0]);
752 }
754 NR::Point b1[BEZIER_MAX_LENGTH];
755 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
756 tolerance_sq, BEZIER_MAX_BEZIERS);
757 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
759 NR::Point b2[BEZIER_MAX_LENGTH];
760 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
761 tolerance_sq, BEZIER_MAX_BEZIERS);
762 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
764 if ( nb1 != -1 && nb2 != -1 ) {
765 /* Fit and draw and reset state */
766 #ifdef DYNA_DRAW_VERBOSE
767 g_print("nb1:%d nb2:%d\n", nb1, nb2);
768 #endif
769 /* CanvasShape */
770 if (! release) {
771 sp_curve_reset(dc->currentcurve);
772 sp_curve_moveto(dc->currentcurve, b1[0]);
773 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
774 sp_curve_curveto(dc->currentcurve, bp1[1],
775 bp1[2], bp1[3]);
776 }
777 sp_curve_lineto(dc->currentcurve,
778 b2[BEZIER_SIZE*(nb2-1) + 3]);
779 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
780 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
781 }
782 sp_curve_closepath(dc->currentcurve);
783 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
784 }
786 /* Current calligraphic */
787 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
788 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
789 }
790 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
791 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
792 }
793 } else {
794 /* fixme: ??? */
795 #ifdef DYNA_DRAW_VERBOSE
796 g_print("[fit_and_split_calligraphics] failed to fit-cubic.\n");
797 #endif
798 draw_temporary_box(dc);
800 for (gint i = 1; i < dc->npoints; i++) {
801 sp_curve_lineto(dc->cal1, dc->point1[i]);
802 }
803 for (gint i = 1; i < dc->npoints; i++) {
804 sp_curve_lineto(dc->cal2, dc->point2[i]);
805 }
806 }
808 /* Fit and draw and copy last point */
809 #ifdef DYNA_DRAW_VERBOSE
810 g_print("[%d]Yup\n", dc->npoints);
811 #endif
812 if (!release) {
813 g_assert(!sp_curve_empty(dc->currentcurve));
815 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
816 SP_TYPE_CANVAS_BPATH,
817 NULL);
818 SPCurve *curve = sp_curve_copy(dc->currentcurve);
819 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
820 sp_curve_unref(curve);
822 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
823 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
824 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic");
825 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", true);
826 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.calligraphic", false);
827 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
828 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
829 //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);
830 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
831 /* fixme: Cannot we cascade it to root more clearly? */
832 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
834 dc->segments = g_slist_prepend(dc->segments, cbp);
835 }
837 dc->point1[0] = dc->point1[dc->npoints - 1];
838 dc->point2[0] = dc->point2[dc->npoints - 1];
839 dc->npoints = 1;
840 } else {
841 draw_temporary_box(dc);
842 }
843 }
845 static void
846 draw_temporary_box(SPDynaDrawContext *dc)
847 {
848 sp_curve_reset(dc->currentcurve);
849 sp_curve_moveto(dc->currentcurve, dc->point1[0]);
850 for (gint i = 1; i < dc->npoints; i++) {
851 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
852 }
853 for (gint i = dc->npoints-1; i >= 0; i--) {
854 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
855 }
856 sp_curve_closepath(dc->currentcurve);
857 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
858 }
860 /*
861 Local Variables:
862 mode:c++
863 c-file-style:"stroustrup"
864 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
865 indent-tabs-mode:nil
866 fill-column:99
867 End:
868 */
869 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :