1 /*
2 * Eraser drawing mode
3 *
4 * Authors:
5 * Mitsuru Oka <oka326@parkcity.ne.jp>
6 * Lauris Kaplinski <lauris@kaplinski.com>
7 * bulia byak <buliabyak@users.sf.net>
8 * MenTaLguY <mental@rydia.net>
9 * Jon A. Cruz <jon@joncruz.org>
10 * Abhishek Sharma
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) 2005-2007 bulia byak
19 * Copyright (C) 2006 MenTaLguY
20 * Copyright (C) 2008 Jon A. Cruz
21 *
22 * Released under GNU GPL, read the file 'COPYING' for more information
23 */
25 #define noERASER_VERBOSE
27 #include "config.h"
29 #include <gtk/gtk.h>
30 #include <gdk/gdkkeysyms.h>
31 #include <glibmm/i18n.h>
32 #include <string>
33 #include <cstring>
34 #include <numeric>
36 #include "svg/svg.h"
37 #include "display/sp-canvas.h"
38 #include "display/canvas-bpath.h"
39 #include <2geom/bezier-utils.h>
41 #include <glib/gmem.h>
42 #include "macros.h"
43 #include "document.h"
44 #include "selection.h"
45 #include "desktop.h"
46 #include "desktop-events.h"
47 #include "desktop-handles.h"
48 #include "desktop-style.h"
49 #include "message-context.h"
50 #include "preferences.h"
51 #include "pixmaps/cursor-eraser.xpm"
52 #include "xml/repr.h"
53 #include "context-fns.h"
54 #include "sp-item.h"
55 #include "color.h"
56 #include "rubberband.h"
57 #include "splivarot.h"
58 #include "sp-item-group.h"
59 #include "sp-shape.h"
60 #include "sp-path.h"
61 #include "sp-text.h"
62 #include "display/canvas-bpath.h"
63 #include "display/canvas-arena.h"
64 #include "livarot/Shape.h"
65 #include <2geom/isnan.h>
66 #include <2geom/pathvector.h>
68 #include "eraser-context.h"
70 using Inkscape::DocumentUndo;
72 #define ERC_RED_RGBA 0xff0000ff
74 #define TOLERANCE_ERASER 0.1
76 #define ERASER_EPSILON 0.5e-6
77 #define ERASER_EPSILON_START 0.5e-2
78 #define ERASER_VEL_START 1e-5
80 #define DRAG_MIN 0.0
81 #define DRAG_DEFAULT 1.0
82 #define DRAG_MAX 1.0
85 static void sp_eraser_context_class_init(SPEraserContextClass *klass);
86 static void sp_eraser_context_init(SPEraserContext *erc);
87 static void sp_eraser_context_dispose(GObject *object);
89 static void sp_eraser_context_setup(SPEventContext *ec);
90 static void sp_eraser_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
91 static gint sp_eraser_context_root_handler(SPEventContext *ec, GdkEvent *event);
93 static void clear_current(SPEraserContext *dc);
94 static void set_to_accumulated(SPEraserContext *dc);
95 static void add_cap(SPCurve *curve, Geom::Point const &pre, Geom::Point const &from, Geom::Point const &to, Geom::Point const &post, double rounding);
96 static void accumulate_eraser(SPEraserContext *dc);
98 static void fit_and_split(SPEraserContext *erc, gboolean release);
100 static void sp_eraser_reset(SPEraserContext *erc, Geom::Point p);
101 static Geom::Point sp_eraser_get_npoint(SPEraserContext const *erc, Geom::Point v);
102 static Geom::Point sp_eraser_get_vpoint(SPEraserContext const *erc, Geom::Point n);
103 static void draw_temporary_box(SPEraserContext *dc);
106 static SPEventContextClass *eraser_parent_class = 0;
108 GType sp_eraser_context_get_type(void)
109 {
110 static GType type = 0;
111 if (!type) {
112 GTypeInfo info = {
113 sizeof(SPEraserContextClass),
114 0, // base_init
115 0, // base_finalize
116 (GClassInitFunc)sp_eraser_context_class_init,
117 0, // class_finalize
118 0, // class_data
119 sizeof(SPEraserContext),
120 0, // n_preallocs
121 (GInstanceInitFunc)sp_eraser_context_init,
122 0 // value_table
123 };
124 type = g_type_register_static(SP_TYPE_COMMON_CONTEXT, "SPEraserContext", &info, static_cast<GTypeFlags>(0));
125 }
126 return type;
127 }
129 static void
130 sp_eraser_context_class_init(SPEraserContextClass *klass)
131 {
132 GObjectClass *object_class = (GObjectClass *) klass;
133 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
135 eraser_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
137 object_class->dispose = sp_eraser_context_dispose;
139 event_context_class->setup = sp_eraser_context_setup;
140 event_context_class->set = sp_eraser_context_set;
141 event_context_class->root_handler = sp_eraser_context_root_handler;
142 }
144 static void
145 sp_eraser_context_init(SPEraserContext *erc)
146 {
147 erc->cursor_shape = cursor_eraser_xpm;
148 erc->hot_x = 4;
149 erc->hot_y = 4;
150 }
152 static void
153 sp_eraser_context_dispose(GObject *object)
154 {
155 //SPEraserContext *erc = SP_ERASER_CONTEXT(object);
157 G_OBJECT_CLASS(eraser_parent_class)->dispose(object);
158 }
160 static void
161 sp_eraser_context_setup(SPEventContext *ec)
162 {
163 SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
164 SPDesktop *desktop = ec->desktop;
166 if (((SPEventContextClass *) eraser_parent_class)->setup)
167 ((SPEventContextClass *) eraser_parent_class)->setup(ec);
169 erc->accumulated = new SPCurve();
170 erc->currentcurve = new SPCurve();
172 erc->cal1 = new SPCurve();
173 erc->cal2 = new SPCurve();
175 erc->currentshape = sp_canvas_item_new(sp_desktop_sketch(desktop), SP_TYPE_CANVAS_BPATH, NULL);
176 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(erc->currentshape), ERC_RED_RGBA, SP_WIND_RULE_EVENODD);
177 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(erc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
178 /* fixme: Cannot we cascade it to root more clearly? */
179 g_signal_connect(G_OBJECT(erc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
181 /*
182 static ProfileFloatElement f_profile[PROFILE_FLOAT_SIZE] = {
183 {"mass",0.02, 0.0, 1.0},
184 {"wiggle",0.0, 0.0, 1.0},
185 {"angle",30.0, -90.0, 90.0},
186 {"thinning",0.1, -1.0, 1.0},
187 {"tremor",0.0, 0.0, 1.0},
188 {"flatness",0.9, 0.0, 1.0},
189 {"cap_rounding",0.0, 0.0, 5.0}
190 };
191 */
193 sp_event_context_read(ec, "mass");
194 sp_event_context_read(ec, "wiggle");
195 sp_event_context_read(ec, "angle");
196 sp_event_context_read(ec, "width");
197 sp_event_context_read(ec, "thinning");
198 sp_event_context_read(ec, "tremor");
199 sp_event_context_read(ec, "flatness");
200 sp_event_context_read(ec, "tracebackground");
201 sp_event_context_read(ec, "usepressure");
202 sp_event_context_read(ec, "usetilt");
203 sp_event_context_read(ec, "abs_width");
204 sp_event_context_read(ec, "cap_rounding");
206 erc->is_drawing = false;
208 erc->_message_context = new Inkscape::MessageContext(desktop->messageStack());
210 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
211 if (prefs->getBool("/tools/eraser/selcue", 0) != 0) {
212 ec->enableSelectionCue();
213 }
214 // TODO temp force:
215 ec->enableSelectionCue();
217 }
219 static void
220 sp_eraser_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
221 {
222 //pass on up to parent class to handle common attributes.
223 if ( eraser_parent_class->set ) {
224 eraser_parent_class->set(ec, val);
225 }
226 }
228 static double
229 flerp(double f0, double f1, double p)
230 {
231 return f0 + ( f1 - f0 ) * p;
232 }
234 /* Get normalized point */
235 static Geom::Point
236 sp_eraser_get_npoint(SPEraserContext const *dc, Geom::Point v)
237 {
238 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
239 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
240 return Geom::Point(( v[Geom::X] - drect.min()[Geom::X] ) / max, ( v[Geom::Y] - drect.min()[Geom::Y] ) / max);
241 }
243 /* Get view point */
244 static Geom::Point
245 sp_eraser_get_vpoint(SPEraserContext const *dc, Geom::Point n)
246 {
247 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
248 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
249 return Geom::Point(n[Geom::X] * max + drect.min()[Geom::X], n[Geom::Y] * max + drect.min()[Geom::Y]);
250 }
252 static void
253 sp_eraser_reset(SPEraserContext *dc, Geom::Point p)
254 {
255 dc->last = dc->cur = sp_eraser_get_npoint(dc, p);
256 dc->vel = Geom::Point(0,0);
257 dc->vel_max = 0;
258 dc->acc = Geom::Point(0,0);
259 dc->ang = Geom::Point(0,0);
260 dc->del = Geom::Point(0,0);
261 }
263 static void
264 sp_eraser_extinput(SPEraserContext *dc, GdkEvent *event)
265 {
266 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
267 dc->pressure = CLAMP (dc->pressure, ERC_MIN_PRESSURE, ERC_MAX_PRESSURE);
268 else
269 dc->pressure = ERC_DEFAULT_PRESSURE;
271 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
272 dc->xtilt = CLAMP (dc->xtilt, ERC_MIN_TILT, ERC_MAX_TILT);
273 else
274 dc->xtilt = ERC_DEFAULT_TILT;
276 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
277 dc->ytilt = CLAMP (dc->ytilt, ERC_MIN_TILT, ERC_MAX_TILT);
278 else
279 dc->ytilt = ERC_DEFAULT_TILT;
280 }
283 static gboolean
284 sp_eraser_apply(SPEraserContext *dc, Geom::Point p)
285 {
286 Geom::Point n = sp_eraser_get_npoint(dc, p);
288 /* Calculate mass and drag */
289 double const mass = flerp(1.0, 160.0, dc->mass);
290 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
292 /* Calculate force and acceleration */
293 Geom::Point force = n - dc->cur;
295 // If force is below the absolute threshold ERASER_EPSILON,
296 // or we haven't yet reached ERASER_VEL_START (i.e. at the beginning of stroke)
297 // _and_ the force is below the (higher) ERASER_EPSILON_START threshold,
298 // discard this move.
299 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
300 // especially bothersome at the start of the stroke where we don't yet have the inertia to
301 // smooth them out.
302 if ( Geom::L2(force) < ERASER_EPSILON || (dc->vel_max < ERASER_VEL_START && Geom::L2(force) < ERASER_EPSILON_START)) {
303 return FALSE;
304 }
306 dc->acc = force / mass;
308 /* Calculate new velocity */
309 dc->vel += dc->acc;
311 if (Geom::L2(dc->vel) > dc->vel_max)
312 dc->vel_max = Geom::L2(dc->vel);
314 /* Calculate angle of drawing tool */
316 double a1;
317 if (dc->usetilt) {
318 // 1a. calculate nib angle from input device tilt:
319 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
321 if (length > 0) {
322 Geom::Point ang1 = Geom::Point(dc->ytilt/length, dc->xtilt/length);
323 a1 = atan2(ang1);
324 }
325 else
326 a1 = 0.0;
327 }
328 else {
329 // 1b. fixed dc->angle (absolutely flat nib):
330 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
331 Geom::Point ang1 = Geom::Point(-sin(radians), cos(radians));
332 a1 = atan2(ang1);
333 }
335 // 2. perpendicular to dc->vel (absolutely non-flat nib):
336 gdouble const mag_vel = Geom::L2(dc->vel);
337 if ( mag_vel < ERASER_EPSILON ) {
338 return FALSE;
339 }
340 Geom::Point ang2 = Geom::rot90(dc->vel) / mag_vel;
342 // 3. Average them using flatness parameter:
343 // calculate angles
344 double a2 = atan2(ang2);
345 // flip a2 to force it to be in the same half-circle as a1
346 bool flipped = false;
347 if (fabs (a2-a1) > 0.5*M_PI) {
348 a2 += M_PI;
349 flipped = true;
350 }
351 // normalize a2
352 if (a2 > M_PI)
353 a2 -= 2*M_PI;
354 if (a2 < -M_PI)
355 a2 += 2*M_PI;
356 // find the flatness-weighted bisector angle, unflip if a2 was flipped
357 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
358 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
360 // Try to detect a sudden flip when the new angle differs too much from the previous for the
361 // current velocity; in that case discard this move
362 double angle_delta = Geom::L2(Geom::Point (cos (new_ang), sin (new_ang)) - dc->ang);
363 if ( angle_delta / Geom::L2(dc->vel) > 4000 ) {
364 return FALSE;
365 }
367 // convert to point
368 dc->ang = Geom::Point (cos (new_ang), sin (new_ang));
370 // g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", Geom::L2(force), Geom::L2(dc->acc), dc->vel_max, Geom::L2(dc->vel), a1, a2, new_ang);
372 /* Apply drag */
373 dc->vel *= 1.0 - drag;
375 /* Update position */
376 dc->last = dc->cur;
377 dc->cur += dc->vel;
379 return TRUE;
380 }
382 static void
383 sp_eraser_brush(SPEraserContext *dc)
384 {
385 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
387 // How much velocity thins strokestyle
388 double vel_thin = flerp (0, 160, dc->vel_thin);
390 // Influence of pressure on thickness
391 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
393 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
394 // drag)
395 Geom::Point brush = sp_eraser_get_vpoint(dc, dc->cur);
396 Geom::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
398 double trace_thick = 1;
400 double width = (pressure_thick * trace_thick - vel_thin * Geom::L2(dc->vel)) * dc->width;
402 double tremble_left = 0, tremble_right = 0;
403 if (dc->tremor > 0) {
404 // obtain two normally distributed random variables, using polar Box-Muller transform
405 double x1, x2, w, y1, y2;
406 do {
407 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
408 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
409 w = x1 * x1 + x2 * x2;
410 } while ( w >= 1.0 );
411 w = sqrt( (-2.0 * log( w ) ) / w );
412 y1 = x1 * w;
413 y2 = x2 * w;
415 // deflect both left and right edges randomly and independently, so that:
416 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
417 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
418 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
419 // comparatively smooth and slow ones excessively jittery
420 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
421 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
422 }
424 if ( width < 0.02 * dc->width ) {
425 width = 0.02 * dc->width;
426 }
428 double dezoomify_factor = 0.05 * 1000;
429 if (!dc->abs_width) {
430 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
431 }
433 Geom::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
434 Geom::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
436 dc->point1[dc->npoints] = brush + del_left;
437 dc->point2[dc->npoints] = brush - del_right;
439 dc->del = 0.5*(del_left + del_right);
441 dc->npoints++;
442 }
444 void
445 sp_erc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
446 {
447 desktop->setToolboxAdjustmentValue (id, value);
448 }
450 static void
451 eraser_cancel(SPEraserContext *dc)
452 {
453 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
454 dc->dragging = FALSE;
455 dc->is_drawing = false;
456 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
457 /* Remove all temporary line segments */
458 while (dc->segments) {
459 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
460 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
461 }
462 /* reset accumulated curve */
463 dc->accumulated->reset();
464 clear_current(dc);
465 if (dc->repr) {
466 dc->repr = NULL;
467 }
468 }
471 gint
472 sp_eraser_context_root_handler(SPEventContext *event_context,
473 GdkEvent *event)
474 {
475 SPEraserContext *dc = SP_ERASER_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 && !event_context->space_panning) {
484 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
485 return TRUE;
486 }
488 Geom::Point const button_w(event->button.x,
489 event->button.y);
490 Geom::Point const button_dt(desktop->w2d(button_w));
491 sp_eraser_reset(dc, button_dt);
492 sp_eraser_extinput(dc, event);
493 sp_eraser_apply(dc, button_dt);
494 dc->accumulated->reset();
495 if (dc->repr) {
496 dc->repr = NULL;
497 }
499 Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
500 Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
502 /* initialize first point */
503 dc->npoints = 0;
505 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
506 ( GDK_KEY_PRESS_MASK |
507 GDK_BUTTON_RELEASE_MASK |
508 GDK_POINTER_MOTION_MASK |
509 GDK_BUTTON_PRESS_MASK ),
510 NULL,
511 event->button.time);
513 ret = TRUE;
515 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
516 dc->is_drawing = true;
517 }
518 break;
519 case GDK_MOTION_NOTIFY:
520 {
521 Geom::Point const motion_w(event->motion.x,
522 event->motion.y);
523 Geom::Point motion_dt(desktop->w2d(motion_w));
524 sp_eraser_extinput(dc, event);
526 dc->_message_context->clear();
528 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
529 dc->dragging = TRUE;
531 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> an eraser stroke"));
533 if (!sp_eraser_apply(dc, motion_dt)) {
534 ret = TRUE;
535 break;
536 }
538 if ( dc->cur != dc->last ) {
539 sp_eraser_brush(dc);
540 g_assert( dc->npoints > 0 );
541 fit_and_split(dc, FALSE);
542 }
543 ret = TRUE;
544 }
545 Inkscape::Rubberband::get(desktop)->move(motion_dt);
546 }
547 break;
550 case GDK_BUTTON_RELEASE:
551 {
552 Geom::Point const motion_w(event->button.x, event->button.y);
553 Geom::Point const motion_dt(desktop->w2d(motion_w));
555 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
556 sp_canvas_end_forced_full_redraws(desktop->canvas);
557 dc->is_drawing = false;
559 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
560 dc->dragging = FALSE;
562 sp_eraser_apply(dc, motion_dt);
564 /* Remove all temporary line segments */
565 while (dc->segments) {
566 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
567 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
568 }
570 /* Create object */
571 fit_and_split(dc, TRUE);
572 accumulate_eraser(dc);
573 set_to_accumulated(dc); // performs document_done
575 /* reset accumulated curve */
576 dc->accumulated->reset();
578 clear_current(dc);
579 if (dc->repr) {
580 dc->repr = NULL;
581 }
583 dc->_message_context->clear();
584 ret = TRUE;
585 }
586 if (Inkscape::Rubberband::get(desktop)->is_started()) {
587 Inkscape::Rubberband::get(desktop)->stop();
588 }
590 break;
591 }
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_erc_update_toolbox (desktop, "eraser-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_erc_update_toolbox (desktop, "eraser-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_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100); // 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_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
632 ret = TRUE;
633 }
634 break;
635 case GDK_Home:
636 case GDK_KP_Home:
637 dc->width = 0.01;
638 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
639 ret = TRUE;
640 break;
641 case GDK_End:
642 case GDK_KP_End:
643 dc->width = 1.0;
644 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
645 ret = TRUE;
646 break;
647 case GDK_x:
648 case GDK_X:
649 if (MOD__ALT_ONLY) {
650 desktop->setToolboxFocusTo ("altx-eraser");
651 ret = TRUE;
652 }
653 break;
654 case GDK_Escape:
655 Inkscape::Rubberband::get(desktop)->stop();
656 if (dc->is_drawing) {
657 // if drawing, cancel, otherwise pass it up for deselecting
658 eraser_cancel (dc);
659 ret = TRUE;
660 }
661 break;
662 case GDK_z:
663 case GDK_Z:
664 if (MOD__CTRL_ONLY && dc->is_drawing) {
665 // if drawing, cancel, otherwise pass it up for undo
666 eraser_cancel (dc);
667 ret = TRUE;
668 }
669 break;
670 default:
671 break;
672 }
673 break;
675 case GDK_KEY_RELEASE:
676 switch (get_group0_keyval(&event->key)) {
677 case GDK_Control_L:
678 case GDK_Control_R:
679 dc->_message_context->clear();
680 break;
681 default:
682 break;
683 }
685 default:
686 break;
687 }
689 if (!ret) {
690 if (((SPEventContextClass *) eraser_parent_class)->root_handler) {
691 ret = ((SPEventContextClass *) eraser_parent_class)->root_handler(event_context, event);
692 }
693 }
695 return ret;
696 }
699 static void
700 clear_current(SPEraserContext *dc)
701 {
702 // reset bpath
703 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
705 // reset curve
706 dc->currentcurve->reset();
707 dc->cal1->reset();
708 dc->cal2->reset();
710 // reset points
711 dc->npoints = 0;
712 }
714 static void
715 set_to_accumulated(SPEraserContext *dc)
716 {
717 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
718 bool workDone = false;
720 if (!dc->accumulated->is_empty()) {
721 if (!dc->repr) {
722 /* Create object */
723 Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
724 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
726 /* Set style */
727 sp_desktop_apply_style_tool (desktop, repr, "/tools/eraser", false);
729 dc->repr = repr;
731 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
732 Inkscape::GC::release(dc->repr);
733 item->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
734 item->updateRepr();
735 }
736 Geom::PathVector pathv = dc->accumulated->get_pathvector() * desktop->dt2doc();
737 gchar *str = sp_svg_write_path(pathv);
738 g_assert( str != NULL );
739 dc->repr->setAttribute("d", str);
740 g_free(str);
742 if ( dc->repr ) {
743 bool wasSelection = false;
744 Inkscape::Selection *selection = sp_desktop_selection(desktop);
745 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
747 gint eraserMode = prefs->getBool("/tools/eraser/mode") ? 1 : 0;
748 Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
750 SPItem* acid = SP_ITEM(desktop->doc()->getObjectByRepr(dc->repr));
751 Geom::OptRect eraserBbox = acid->getBounds(Geom::identity());
752 Geom::Rect bounds = (*eraserBbox) * desktop->doc2dt();
753 std::vector<SPItem*> remainingItems;
754 GSList* toWorkOn = 0;
755 if (selection->isEmpty()) {
756 if ( eraserMode ) {
757 toWorkOn = sp_desktop_document(desktop)->getItemsPartiallyInBox(desktop->dkey, bounds);
758 } else {
759 Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
760 toWorkOn = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, r->getPoints());
761 }
762 toWorkOn = g_slist_remove( toWorkOn, acid );
763 } else {
764 toWorkOn = g_slist_copy(const_cast<GSList*>(selection->itemList()));
765 wasSelection = true;
766 }
768 if ( g_slist_length(toWorkOn) > 0 ) {
769 if ( eraserMode ) {
770 for (GSList *i = toWorkOn ; i ; i = i->next ) {
771 SPItem *item = SP_ITEM(i->data);
772 if ( eraserMode ) {
773 Geom::OptRect bbox = item->getBounds(Geom::identity());
774 if (bbox && bbox->intersects(*eraserBbox)) {
775 Inkscape::XML::Node* dup = dc->repr->duplicate(xml_doc);
776 dc->repr->parent()->appendChild(dup);
777 Inkscape::GC::release(dup); // parent takes over
779 selection->set(item);
780 selection->add(dup);
781 sp_selected_path_diff_skip_undo(desktop);
782 workDone = true; // TODO set this only if something was cut.
783 if ( !selection->isEmpty() ) {
784 // If the item was not completely erased, track the new remainder.
785 GSList *nowSel = g_slist_copy(const_cast<GSList *>(selection->itemList()));
786 for (GSList const *i2 = nowSel ; i2 ; i2 = i2->next ) {
787 remainingItems.push_back(SP_ITEM(i2->data));
788 }
789 g_slist_free(nowSel);
790 }
791 } else {
792 remainingItems.push_back(item);
793 }
794 }
795 }
796 } else {
797 for (GSList *i = toWorkOn ; i ; i = i->next ) {
798 sp_object_ref( SP_ITEM(i->data), 0 );
799 }
800 for (GSList *i = toWorkOn ; i ; i = i->next ) {
801 SPItem *item = SP_ITEM(i->data);
802 item->deleteObject(true);
803 sp_object_unref(item);
804 workDone = true;
805 }
806 }
808 g_slist_free(toWorkOn);
810 if ( !eraserMode ) {
811 //sp_selection_delete(desktop);
812 remainingItems.clear();
813 }
815 selection->clear();
816 if ( wasSelection ) {
817 if ( !remainingItems.empty() ) {
818 selection->add(remainingItems.begin(), remainingItems.end());
819 }
820 }
821 }
823 // Remove the eraser stroke itself:
824 sp_repr_unparent( dc->repr );
825 dc->repr = 0;
826 }
827 } else {
828 if (dc->repr) {
829 sp_repr_unparent(dc->repr);
830 dc->repr = 0;
831 }
832 }
835 if ( workDone ) {
836 DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ERASER,
837 _("Draw eraser stroke"));
838 } else {
839 DocumentUndo::cancel(sp_desktop_document(desktop));
840 }
841 }
843 static void
844 add_cap(SPCurve *curve,
845 Geom::Point const &pre, Geom::Point const &from,
846 Geom::Point const &to, Geom::Point const &post,
847 double rounding)
848 {
849 Geom::Point vel = rounding * Geom::rot90( to - from ) / sqrt(2.0);
850 double mag = Geom::L2(vel);
852 Geom::Point v_in = from - pre;
853 double mag_in = Geom::L2(v_in);
854 if ( mag_in > ERASER_EPSILON ) {
855 v_in = mag * v_in / mag_in;
856 } else {
857 v_in = Geom::Point(0, 0);
858 }
860 Geom::Point v_out = to - post;
861 double mag_out = Geom::L2(v_out);
862 if ( mag_out > ERASER_EPSILON ) {
863 v_out = mag * v_out / mag_out;
864 } else {
865 v_out = Geom::Point(0, 0);
866 }
868 if ( Geom::L2(v_in) > ERASER_EPSILON || Geom::L2(v_out) > ERASER_EPSILON ) {
869 curve->curveto(from + v_in, to + v_out, to);
870 }
871 }
873 static void
874 accumulate_eraser(SPEraserContext *dc)
875 {
876 if ( !dc->cal1->is_empty() && !dc->cal2->is_empty() ) {
877 dc->accumulated->reset(); /* Is this required ?? */
878 SPCurve *rev_cal2 = dc->cal2->create_reverse();
880 g_assert(dc->cal1->get_segment_count() > 0);
881 g_assert(rev_cal2->get_segment_count() > 0);
882 g_assert( ! dc->cal1->first_path()->closed() );
883 g_assert( ! rev_cal2->first_path()->closed() );
885 Geom::CubicBezier const * dc_cal1_firstseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->first_segment() );
886 Geom::CubicBezier const * rev_cal2_firstseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->first_segment() );
887 Geom::CubicBezier const * dc_cal1_lastseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->last_segment() );
888 Geom::CubicBezier const * rev_cal2_lastseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->last_segment() );
889 g_assert( dc_cal1_firstseg );
890 g_assert( rev_cal2_firstseg );
891 g_assert( dc_cal1_lastseg );
892 g_assert( rev_cal2_lastseg );
894 dc->accumulated->append(dc->cal1, FALSE);
896 add_cap(dc->accumulated, (*dc_cal1_lastseg)[2], (*dc_cal1_lastseg)[3], (*rev_cal2_firstseg)[0], (*rev_cal2_firstseg)[1], dc->cap_rounding);
898 dc->accumulated->append(rev_cal2, TRUE);
900 add_cap(dc->accumulated, (*rev_cal2_lastseg)[2], (*rev_cal2_lastseg)[3], (*dc_cal1_firstseg)[0], (*dc_cal1_firstseg)[1], dc->cap_rounding);
902 dc->accumulated->closepath();
904 rev_cal2->unref();
906 dc->cal1->reset();
907 dc->cal2->reset();
908 }
909 }
911 static double square(double const x)
912 {
913 return x * x;
914 }
916 static void
917 fit_and_split(SPEraserContext *dc, gboolean release)
918 {
919 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
921 double const tolerance_sq = square( desktop->w2d().descrim() * TOLERANCE_ERASER );
923 #ifdef ERASER_VERBOSE
924 g_print("[F&S:R=%c]", release?'T':'F');
925 #endif
927 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
928 return; // just clicked
930 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
931 #define BEZIER_SIZE 4
932 #define BEZIER_MAX_BEZIERS 8
933 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
935 #ifdef ERASER_VERBOSE
936 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
937 dc->npoints, release ? "TRUE" : "FALSE");
938 #endif
940 /* Current eraser */
941 if ( dc->cal1->is_empty() || dc->cal2->is_empty() ) {
942 /* dc->npoints > 0 */
943 /* g_print("erasers(1|2) reset\n"); */
944 dc->cal1->reset();
945 dc->cal2->reset();
947 dc->cal1->moveto(dc->point1[0]);
948 dc->cal2->moveto(dc->point2[0]);
949 }
951 Geom::Point b1[BEZIER_MAX_LENGTH];
952 gint const nb1 = Geom::bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
953 tolerance_sq, BEZIER_MAX_BEZIERS);
954 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
956 Geom::Point b2[BEZIER_MAX_LENGTH];
957 gint const nb2 = Geom::bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
958 tolerance_sq, BEZIER_MAX_BEZIERS);
959 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
961 if ( nb1 != -1 && nb2 != -1 ) {
962 /* Fit and draw and reset state */
963 #ifdef ERASER_VERBOSE
964 g_print("nb1:%d nb2:%d\n", nb1, nb2);
965 #endif
966 /* CanvasShape */
967 if (! release) {
968 dc->currentcurve->reset();
969 dc->currentcurve->moveto(b1[0]);
970 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
971 dc->currentcurve->curveto(bp1[1],
972 bp1[2], bp1[3]);
973 }
974 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
975 for (Geom::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
976 dc->currentcurve->curveto(bp2[2], bp2[1], bp2[0]);
977 }
978 // FIXME: dc->segments is always NULL at this point??
979 if (!dc->segments) { // first segment
980 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
981 }
982 dc->currentcurve->closepath();
983 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
984 }
986 /* Current eraser */
987 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
988 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
989 }
990 for (Geom::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
991 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
992 }
993 } else {
994 /* fixme: ??? */
995 #ifdef ERASER_VERBOSE
996 g_print("[fit_and_split] failed to fit-cubic.\n");
997 #endif
998 draw_temporary_box(dc);
1000 for (gint i = 1; i < dc->npoints; i++) {
1001 dc->cal1->lineto(dc->point1[i]);
1002 }
1003 for (gint i = 1; i < dc->npoints; i++) {
1004 dc->cal2->lineto(dc->point2[i]);
1005 }
1006 }
1008 /* Fit and draw and copy last point */
1009 #ifdef ERASER_VERBOSE
1010 g_print("[%d]Yup\n", dc->npoints);
1011 #endif
1012 if (!release) {
1013 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1014 gint eraserMode = prefs->getBool("/tools/eraser/mode") ? 1 : 0;
1015 g_assert(!dc->currentcurve->is_empty());
1017 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(desktop),
1018 SP_TYPE_CANVAS_BPATH,
1019 NULL);
1020 SPCurve *curve = dc->currentcurve->copy();
1021 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1022 curve->unref();
1024 guint32 fillColor = sp_desktop_get_color_tool (desktop, "/tools/eraser", true);
1025 //guint32 strokeColor = sp_desktop_get_color_tool (desktop, "/tools/eraser", false);
1026 double opacity = sp_desktop_get_master_opacity_tool (desktop, "/tools/eraser");
1027 double fillOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/eraser", true);
1028 //double strokeOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/eraser", false);
1029 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1030 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1031 //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);
1032 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1033 /* fixme: Cannot we cascade it to root more clearly? */
1034 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
1036 dc->segments = g_slist_prepend(dc->segments, cbp);
1038 if ( !eraserMode ) {
1039 sp_canvas_item_hide(cbp);
1040 sp_canvas_item_hide(dc->currentshape);
1041 }
1042 }
1044 dc->point1[0] = dc->point1[dc->npoints - 1];
1045 dc->point2[0] = dc->point2[dc->npoints - 1];
1046 dc->npoints = 1;
1047 } else {
1048 draw_temporary_box(dc);
1049 }
1050 }
1052 static void
1053 draw_temporary_box(SPEraserContext *dc)
1054 {
1055 dc->currentcurve->reset();
1057 dc->currentcurve->moveto(dc->point1[dc->npoints-1]);
1058 for (gint i = dc->npoints-2; i >= 0; i--) {
1059 dc->currentcurve->lineto(dc->point1[i]);
1060 }
1061 for (gint i = 0; i < dc->npoints; i++) {
1062 dc->currentcurve->lineto(dc->point2[i]);
1063 }
1064 if (dc->npoints >= 2) {
1065 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);
1066 }
1068 dc->currentcurve->closepath();
1069 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1070 }
1072 /*
1073 Local Variables:
1074 mode:c++
1075 c-file-style:"stroustrup"
1076 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1077 indent-tabs-mode:nil
1078 fill-column:99
1079 End:
1080 */
1081 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :