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/canvas-bpath.h"
38 #include <2geom/bezier-utils.h>
40 #include <glib/gmem.h>
41 #include "macros.h"
42 #include "document.h"
43 #include "selection.h"
44 #include "desktop.h"
45 #include "desktop-events.h"
46 #include "desktop-handles.h"
47 #include "desktop-style.h"
48 #include "message-context.h"
49 #include "preferences.h"
50 #include "pixmaps/cursor-eraser.xpm"
51 #include "xml/repr.h"
52 #include "context-fns.h"
53 #include "sp-item.h"
54 #include "color.h"
55 #include "rubberband.h"
56 #include "splivarot.h"
57 #include "sp-item-group.h"
58 #include "sp-shape.h"
59 #include "sp-path.h"
60 #include "sp-text.h"
61 #include "display/canvas-bpath.h"
62 #include "display/canvas-arena.h"
63 #include "livarot/Shape.h"
64 #include <2geom/isnan.h>
65 #include <2geom/pathvector.h>
67 #include "eraser-context.h"
69 using Inkscape::DocumentUndo;
71 #define ERC_RED_RGBA 0xff0000ff
73 #define TOLERANCE_ERASER 0.1
75 #define ERASER_EPSILON 0.5e-6
76 #define ERASER_EPSILON_START 0.5e-2
77 #define ERASER_VEL_START 1e-5
79 #define DRAG_MIN 0.0
80 #define DRAG_DEFAULT 1.0
81 #define DRAG_MAX 1.0
84 static void sp_eraser_context_class_init(SPEraserContextClass *klass);
85 static void sp_eraser_context_init(SPEraserContext *erc);
86 static void sp_eraser_context_dispose(GObject *object);
88 static void sp_eraser_context_setup(SPEventContext *ec);
89 static void sp_eraser_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
90 static gint sp_eraser_context_root_handler(SPEventContext *ec, GdkEvent *event);
92 static void clear_current(SPEraserContext *dc);
93 static void set_to_accumulated(SPEraserContext *dc);
94 static void add_cap(SPCurve *curve, Geom::Point const &pre, Geom::Point const &from, Geom::Point const &to, Geom::Point const &post, double rounding);
95 static void accumulate_eraser(SPEraserContext *dc);
97 static void fit_and_split(SPEraserContext *erc, gboolean release);
99 static void sp_eraser_reset(SPEraserContext *erc, Geom::Point p);
100 static Geom::Point sp_eraser_get_npoint(SPEraserContext const *erc, Geom::Point v);
101 static Geom::Point sp_eraser_get_vpoint(SPEraserContext const *erc, Geom::Point n);
102 static void draw_temporary_box(SPEraserContext *dc);
105 static SPEventContextClass *eraser_parent_class = 0;
107 GType sp_eraser_context_get_type(void)
108 {
109 static GType type = 0;
110 if (!type) {
111 GTypeInfo info = {
112 sizeof(SPEraserContextClass),
113 0, // base_init
114 0, // base_finalize
115 (GClassInitFunc)sp_eraser_context_class_init,
116 0, // class_finalize
117 0, // class_data
118 sizeof(SPEraserContext),
119 0, // n_preallocs
120 (GInstanceInitFunc)sp_eraser_context_init,
121 0 // value_table
122 };
123 type = g_type_register_static(SP_TYPE_COMMON_CONTEXT, "SPEraserContext", &info, static_cast<GTypeFlags>(0));
124 }
125 return type;
126 }
128 static void
129 sp_eraser_context_class_init(SPEraserContextClass *klass)
130 {
131 GObjectClass *object_class = (GObjectClass *) klass;
132 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
134 eraser_parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
136 object_class->dispose = sp_eraser_context_dispose;
138 event_context_class->setup = sp_eraser_context_setup;
139 event_context_class->set = sp_eraser_context_set;
140 event_context_class->root_handler = sp_eraser_context_root_handler;
141 }
143 static void
144 sp_eraser_context_init(SPEraserContext *erc)
145 {
146 erc->cursor_shape = cursor_eraser_xpm;
147 erc->hot_x = 4;
148 erc->hot_y = 4;
149 }
151 static void
152 sp_eraser_context_dispose(GObject *object)
153 {
154 //SPEraserContext *erc = SP_ERASER_CONTEXT(object);
156 G_OBJECT_CLASS(eraser_parent_class)->dispose(object);
157 }
159 static void
160 sp_eraser_context_setup(SPEventContext *ec)
161 {
162 SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
163 SPDesktop *desktop = ec->desktop;
165 if (((SPEventContextClass *) eraser_parent_class)->setup)
166 ((SPEventContextClass *) eraser_parent_class)->setup(ec);
168 erc->accumulated = new SPCurve();
169 erc->currentcurve = new SPCurve();
171 erc->cal1 = new SPCurve();
172 erc->cal2 = new SPCurve();
174 erc->currentshape = sp_canvas_item_new(sp_desktop_sketch(desktop), SP_TYPE_CANVAS_BPATH, NULL);
175 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(erc->currentshape), ERC_RED_RGBA, SP_WIND_RULE_EVENODD);
176 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(erc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
177 /* fixme: Cannot we cascade it to root more clearly? */
178 g_signal_connect(G_OBJECT(erc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
180 /*
181 static ProfileFloatElement f_profile[PROFILE_FLOAT_SIZE] = {
182 {"mass",0.02, 0.0, 1.0},
183 {"wiggle",0.0, 0.0, 1.0},
184 {"angle",30.0, -90.0, 90.0},
185 {"thinning",0.1, -1.0, 1.0},
186 {"tremor",0.0, 0.0, 1.0},
187 {"flatness",0.9, 0.0, 1.0},
188 {"cap_rounding",0.0, 0.0, 5.0}
189 };
190 */
192 sp_event_context_read(ec, "mass");
193 sp_event_context_read(ec, "wiggle");
194 sp_event_context_read(ec, "angle");
195 sp_event_context_read(ec, "width");
196 sp_event_context_read(ec, "thinning");
197 sp_event_context_read(ec, "tremor");
198 sp_event_context_read(ec, "flatness");
199 sp_event_context_read(ec, "tracebackground");
200 sp_event_context_read(ec, "usepressure");
201 sp_event_context_read(ec, "usetilt");
202 sp_event_context_read(ec, "abs_width");
203 sp_event_context_read(ec, "cap_rounding");
205 erc->is_drawing = false;
207 erc->_message_context = new Inkscape::MessageContext(desktop->messageStack());
209 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
210 if (prefs->getBool("/tools/eraser/selcue", 0) != 0) {
211 ec->enableSelectionCue();
212 }
213 // TODO temp force:
214 ec->enableSelectionCue();
216 }
218 static void
219 sp_eraser_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
220 {
221 //pass on up to parent class to handle common attributes.
222 if ( eraser_parent_class->set ) {
223 eraser_parent_class->set(ec, val);
224 }
225 }
227 static double
228 flerp(double f0, double f1, double p)
229 {
230 return f0 + ( f1 - f0 ) * p;
231 }
233 /* Get normalized point */
234 static Geom::Point
235 sp_eraser_get_npoint(SPEraserContext const *dc, Geom::Point v)
236 {
237 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
238 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
239 return Geom::Point(( v[Geom::X] - drect.min()[Geom::X] ) / max, ( v[Geom::Y] - drect.min()[Geom::Y] ) / max);
240 }
242 /* Get view point */
243 static Geom::Point
244 sp_eraser_get_vpoint(SPEraserContext const *dc, Geom::Point n)
245 {
246 Geom::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
247 double const max = MAX ( drect.dimensions()[Geom::X], drect.dimensions()[Geom::Y] );
248 return Geom::Point(n[Geom::X] * max + drect.min()[Geom::X], n[Geom::Y] * max + drect.min()[Geom::Y]);
249 }
251 static void
252 sp_eraser_reset(SPEraserContext *dc, Geom::Point p)
253 {
254 dc->last = dc->cur = sp_eraser_get_npoint(dc, p);
255 dc->vel = Geom::Point(0,0);
256 dc->vel_max = 0;
257 dc->acc = Geom::Point(0,0);
258 dc->ang = Geom::Point(0,0);
259 dc->del = Geom::Point(0,0);
260 }
262 static void
263 sp_eraser_extinput(SPEraserContext *dc, GdkEvent *event)
264 {
265 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
266 dc->pressure = CLAMP (dc->pressure, ERC_MIN_PRESSURE, ERC_MAX_PRESSURE);
267 else
268 dc->pressure = ERC_DEFAULT_PRESSURE;
270 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
271 dc->xtilt = CLAMP (dc->xtilt, ERC_MIN_TILT, ERC_MAX_TILT);
272 else
273 dc->xtilt = ERC_DEFAULT_TILT;
275 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
276 dc->ytilt = CLAMP (dc->ytilt, ERC_MIN_TILT, ERC_MAX_TILT);
277 else
278 dc->ytilt = ERC_DEFAULT_TILT;
279 }
282 static gboolean
283 sp_eraser_apply(SPEraserContext *dc, Geom::Point p)
284 {
285 Geom::Point n = sp_eraser_get_npoint(dc, p);
287 /* Calculate mass and drag */
288 double const mass = flerp(1.0, 160.0, dc->mass);
289 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
291 /* Calculate force and acceleration */
292 Geom::Point force = n - dc->cur;
294 // If force is below the absolute threshold ERASER_EPSILON,
295 // or we haven't yet reached ERASER_VEL_START (i.e. at the beginning of stroke)
296 // _and_ the force is below the (higher) ERASER_EPSILON_START threshold,
297 // discard this move.
298 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
299 // especially bothersome at the start of the stroke where we don't yet have the inertia to
300 // smooth them out.
301 if ( Geom::L2(force) < ERASER_EPSILON || (dc->vel_max < ERASER_VEL_START && Geom::L2(force) < ERASER_EPSILON_START)) {
302 return FALSE;
303 }
305 dc->acc = force / mass;
307 /* Calculate new velocity */
308 dc->vel += dc->acc;
310 if (Geom::L2(dc->vel) > dc->vel_max)
311 dc->vel_max = Geom::L2(dc->vel);
313 /* Calculate angle of drawing tool */
315 double a1;
316 if (dc->usetilt) {
317 // 1a. calculate nib angle from input device tilt:
318 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
320 if (length > 0) {
321 Geom::Point ang1 = Geom::Point(dc->ytilt/length, dc->xtilt/length);
322 a1 = atan2(ang1);
323 }
324 else
325 a1 = 0.0;
326 }
327 else {
328 // 1b. fixed dc->angle (absolutely flat nib):
329 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
330 Geom::Point ang1 = Geom::Point(-sin(radians), cos(radians));
331 a1 = atan2(ang1);
332 }
334 // 2. perpendicular to dc->vel (absolutely non-flat nib):
335 gdouble const mag_vel = Geom::L2(dc->vel);
336 if ( mag_vel < ERASER_EPSILON ) {
337 return FALSE;
338 }
339 Geom::Point ang2 = Geom::rot90(dc->vel) / mag_vel;
341 // 3. Average them using flatness parameter:
342 // calculate angles
343 double a2 = atan2(ang2);
344 // flip a2 to force it to be in the same half-circle as a1
345 bool flipped = false;
346 if (fabs (a2-a1) > 0.5*M_PI) {
347 a2 += M_PI;
348 flipped = true;
349 }
350 // normalize a2
351 if (a2 > M_PI)
352 a2 -= 2*M_PI;
353 if (a2 < -M_PI)
354 a2 += 2*M_PI;
355 // find the flatness-weighted bisector angle, unflip if a2 was flipped
356 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
357 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
359 // Try to detect a sudden flip when the new angle differs too much from the previous for the
360 // current velocity; in that case discard this move
361 double angle_delta = Geom::L2(Geom::Point (cos (new_ang), sin (new_ang)) - dc->ang);
362 if ( angle_delta / Geom::L2(dc->vel) > 4000 ) {
363 return FALSE;
364 }
366 // convert to point
367 dc->ang = Geom::Point (cos (new_ang), sin (new_ang));
369 // 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);
371 /* Apply drag */
372 dc->vel *= 1.0 - drag;
374 /* Update position */
375 dc->last = dc->cur;
376 dc->cur += dc->vel;
378 return TRUE;
379 }
381 static void
382 sp_eraser_brush(SPEraserContext *dc)
383 {
384 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
386 // How much velocity thins strokestyle
387 double vel_thin = flerp (0, 160, dc->vel_thin);
389 // Influence of pressure on thickness
390 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
392 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
393 // drag)
394 Geom::Point brush = sp_eraser_get_vpoint(dc, dc->cur);
395 Geom::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
397 double trace_thick = 1;
399 double width = (pressure_thick * trace_thick - vel_thin * Geom::L2(dc->vel)) * dc->width;
401 double tremble_left = 0, tremble_right = 0;
402 if (dc->tremor > 0) {
403 // obtain two normally distributed random variables, using polar Box-Muller transform
404 double x1, x2, w, y1, y2;
405 do {
406 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
407 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
408 w = x1 * x1 + x2 * x2;
409 } while ( w >= 1.0 );
410 w = sqrt( (-2.0 * log( w ) ) / w );
411 y1 = x1 * w;
412 y2 = x2 * w;
414 // deflect both left and right edges randomly and independently, so that:
415 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
416 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
417 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
418 // comparatively smooth and slow ones excessively jittery
419 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
420 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*Geom::L2(dc->vel));
421 }
423 if ( width < 0.02 * dc->width ) {
424 width = 0.02 * dc->width;
425 }
427 double dezoomify_factor = 0.05 * 1000;
428 if (!dc->abs_width) {
429 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
430 }
432 Geom::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
433 Geom::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
435 dc->point1[dc->npoints] = brush + del_left;
436 dc->point2[dc->npoints] = brush - del_right;
438 dc->del = 0.5*(del_left + del_right);
440 dc->npoints++;
441 }
443 void
444 sp_erc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
445 {
446 desktop->setToolboxAdjustmentValue (id, value);
447 }
449 static void
450 eraser_cancel(SPEraserContext *dc)
451 {
452 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
453 dc->dragging = FALSE;
454 dc->is_drawing = false;
455 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
456 /* Remove all temporary line segments */
457 while (dc->segments) {
458 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
459 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
460 }
461 /* reset accumulated curve */
462 dc->accumulated->reset();
463 clear_current(dc);
464 if (dc->repr) {
465 dc->repr = NULL;
466 }
467 }
470 gint
471 sp_eraser_context_root_handler(SPEventContext *event_context,
472 GdkEvent *event)
473 {
474 SPEraserContext *dc = SP_ERASER_CONTEXT(event_context);
475 SPDesktop *desktop = event_context->desktop;
477 gint ret = FALSE;
479 switch (event->type) {
480 case GDK_BUTTON_PRESS:
481 if (event->button.button == 1 && !event_context->space_panning) {
483 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
484 return TRUE;
485 }
487 Geom::Point const button_w(event->button.x,
488 event->button.y);
489 Geom::Point const button_dt(desktop->w2d(button_w));
490 sp_eraser_reset(dc, button_dt);
491 sp_eraser_extinput(dc, event);
492 sp_eraser_apply(dc, button_dt);
493 dc->accumulated->reset();
494 if (dc->repr) {
495 dc->repr = NULL;
496 }
498 Inkscape::Rubberband::get(desktop)->start(desktop, button_dt);
499 Inkscape::Rubberband::get(desktop)->setMode(RUBBERBAND_MODE_TOUCHPATH);
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 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
515 dc->is_drawing = true;
516 }
517 break;
518 case GDK_MOTION_NOTIFY:
519 {
520 Geom::Point const motion_w(event->motion.x,
521 event->motion.y);
522 Geom::Point motion_dt(desktop->w2d(motion_w));
523 sp_eraser_extinput(dc, event);
525 dc->_message_context->clear();
527 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
528 dc->dragging = TRUE;
530 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> an eraser stroke"));
532 if (!sp_eraser_apply(dc, motion_dt)) {
533 ret = TRUE;
534 break;
535 }
537 if ( dc->cur != dc->last ) {
538 sp_eraser_brush(dc);
539 g_assert( dc->npoints > 0 );
540 fit_and_split(dc, FALSE);
541 }
542 ret = TRUE;
543 }
544 Inkscape::Rubberband::get(desktop)->move(motion_dt);
545 }
546 break;
549 case GDK_BUTTON_RELEASE:
550 {
551 Geom::Point const motion_w(event->button.x, event->button.y);
552 Geom::Point const motion_dt(desktop->w2d(motion_w));
554 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
555 sp_canvas_end_forced_full_redraws(desktop->canvas);
556 dc->is_drawing = false;
558 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
559 dc->dragging = FALSE;
561 sp_eraser_apply(dc, motion_dt);
563 /* Remove all temporary line segments */
564 while (dc->segments) {
565 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
566 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
567 }
569 /* Create object */
570 fit_and_split(dc, TRUE);
571 accumulate_eraser(dc);
572 set_to_accumulated(dc); // performs document_done
574 /* reset accumulated curve */
575 dc->accumulated->reset();
577 clear_current(dc);
578 if (dc->repr) {
579 dc->repr = NULL;
580 }
582 dc->_message_context->clear();
583 ret = TRUE;
584 }
585 if (Inkscape::Rubberband::get(desktop)->is_started()) {
586 Inkscape::Rubberband::get(desktop)->stop();
587 }
589 break;
590 }
592 case GDK_KEY_PRESS:
593 switch (get_group0_keyval (&event->key)) {
594 case GDK_Up:
595 case GDK_KP_Up:
596 if (!MOD__CTRL_ONLY) {
597 dc->angle += 5.0;
598 if (dc->angle > 90.0)
599 dc->angle = 90.0;
600 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
601 ret = TRUE;
602 }
603 break;
604 case GDK_Down:
605 case GDK_KP_Down:
606 if (!MOD__CTRL_ONLY) {
607 dc->angle -= 5.0;
608 if (dc->angle < -90.0)
609 dc->angle = -90.0;
610 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
611 ret = TRUE;
612 }
613 break;
614 case GDK_Right:
615 case GDK_KP_Right:
616 if (!MOD__CTRL_ONLY) {
617 dc->width += 0.01;
618 if (dc->width > 1.0)
619 dc->width = 1.0;
620 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100); // the same spinbutton is for alt+x
621 ret = TRUE;
622 }
623 break;
624 case GDK_Left:
625 case GDK_KP_Left:
626 if (!MOD__CTRL_ONLY) {
627 dc->width -= 0.01;
628 if (dc->width < 0.01)
629 dc->width = 0.01;
630 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
631 ret = TRUE;
632 }
633 break;
634 case GDK_Home:
635 case GDK_KP_Home:
636 dc->width = 0.01;
637 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
638 ret = TRUE;
639 break;
640 case GDK_End:
641 case GDK_KP_End:
642 dc->width = 1.0;
643 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
644 ret = TRUE;
645 break;
646 case GDK_x:
647 case GDK_X:
648 if (MOD__ALT_ONLY) {
649 desktop->setToolboxFocusTo ("altx-eraser");
650 ret = TRUE;
651 }
652 break;
653 case GDK_Escape:
654 Inkscape::Rubberband::get(desktop)->stop();
655 if (dc->is_drawing) {
656 // if drawing, cancel, otherwise pass it up for deselecting
657 eraser_cancel (dc);
658 ret = TRUE;
659 }
660 break;
661 case GDK_z:
662 case GDK_Z:
663 if (MOD__CTRL_ONLY && dc->is_drawing) {
664 // if drawing, cancel, otherwise pass it up for undo
665 eraser_cancel (dc);
666 ret = TRUE;
667 }
668 break;
669 default:
670 break;
671 }
672 break;
674 case GDK_KEY_RELEASE:
675 switch (get_group0_keyval(&event->key)) {
676 case GDK_Control_L:
677 case GDK_Control_R:
678 dc->_message_context->clear();
679 break;
680 default:
681 break;
682 }
684 default:
685 break;
686 }
688 if (!ret) {
689 if (((SPEventContextClass *) eraser_parent_class)->root_handler) {
690 ret = ((SPEventContextClass *) eraser_parent_class)->root_handler(event_context, event);
691 }
692 }
694 return ret;
695 }
698 static void
699 clear_current(SPEraserContext *dc)
700 {
701 // reset bpath
702 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
704 // reset curve
705 dc->currentcurve->reset();
706 dc->cal1->reset();
707 dc->cal2->reset();
709 // reset points
710 dc->npoints = 0;
711 }
713 static void
714 set_to_accumulated(SPEraserContext *dc)
715 {
716 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
717 bool workDone = false;
719 if (!dc->accumulated->is_empty()) {
720 if (!dc->repr) {
721 /* Create object */
722 Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
723 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
725 /* Set style */
726 sp_desktop_apply_style_tool (desktop, repr, "/tools/eraser", false);
728 dc->repr = repr;
730 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
731 Inkscape::GC::release(dc->repr);
732 item->transform = SP_ITEM(desktop->currentLayer())->i2doc_affine().inverse();
733 item->updateRepr();
734 }
735 Geom::PathVector pathv = dc->accumulated->get_pathvector() * desktop->dt2doc();
736 gchar *str = sp_svg_write_path(pathv);
737 g_assert( str != NULL );
738 dc->repr->setAttribute("d", str);
739 g_free(str);
741 if ( dc->repr ) {
742 bool wasSelection = false;
743 Inkscape::Selection *selection = sp_desktop_selection(desktop);
744 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
746 gint eraserMode = prefs->getBool("/tools/eraser/mode") ? 1 : 0;
747 Inkscape::XML::Document *xml_doc = desktop->doc()->getReprDoc();
749 SPItem* acid = SP_ITEM(desktop->doc()->getObjectByRepr(dc->repr));
750 Geom::OptRect eraserBbox = acid->getBounds(Geom::identity());
751 Geom::Rect bounds = (*eraserBbox) * desktop->doc2dt();
752 std::vector<SPItem*> remainingItems;
753 GSList* toWorkOn = 0;
754 if (selection->isEmpty()) {
755 if ( eraserMode ) {
756 toWorkOn = sp_desktop_document(desktop)->getItemsPartiallyInBox(desktop->dkey, bounds);
757 } else {
758 Inkscape::Rubberband *r = Inkscape::Rubberband::get(desktop);
759 toWorkOn = sp_desktop_document(desktop)->getItemsAtPoints(desktop->dkey, r->getPoints());
760 }
761 toWorkOn = g_slist_remove( toWorkOn, acid );
762 } else {
763 toWorkOn = g_slist_copy(const_cast<GSList*>(selection->itemList()));
764 wasSelection = true;
765 }
767 if ( g_slist_length(toWorkOn) > 0 ) {
768 if ( eraserMode ) {
769 for (GSList *i = toWorkOn ; i ; i = i->next ) {
770 SPItem *item = SP_ITEM(i->data);
771 if ( eraserMode ) {
772 Geom::OptRect bbox = item->getBounds(Geom::identity());
773 if (bbox && bbox->intersects(*eraserBbox)) {
774 Inkscape::XML::Node* dup = dc->repr->duplicate(xml_doc);
775 dc->repr->parent()->appendChild(dup);
776 Inkscape::GC::release(dup); // parent takes over
778 selection->set(item);
779 selection->add(dup);
780 sp_selected_path_diff_skip_undo(desktop);
781 workDone = true; // TODO set this only if something was cut.
782 if ( !selection->isEmpty() ) {
783 // If the item was not completely erased, track the new remainder.
784 GSList *nowSel = g_slist_copy(const_cast<GSList *>(selection->itemList()));
785 for (GSList const *i2 = nowSel ; i2 ; i2 = i2->next ) {
786 remainingItems.push_back(SP_ITEM(i2->data));
787 }
788 g_slist_free(nowSel);
789 }
790 } else {
791 remainingItems.push_back(item);
792 }
793 }
794 }
795 } else {
796 for (GSList *i = toWorkOn ; i ; i = i->next ) {
797 sp_object_ref( SP_ITEM(i->data), 0 );
798 }
799 for (GSList *i = toWorkOn ; i ; i = i->next ) {
800 SPItem *item = SP_ITEM(i->data);
801 item->deleteObject(true);
802 sp_object_unref(item);
803 workDone = true;
804 }
805 }
807 g_slist_free(toWorkOn);
809 if ( !eraserMode ) {
810 //sp_selection_delete(desktop);
811 remainingItems.clear();
812 }
814 selection->clear();
815 if ( wasSelection ) {
816 if ( !remainingItems.empty() ) {
817 selection->add(remainingItems.begin(), remainingItems.end());
818 }
819 }
820 }
822 // Remove the eraser stroke itself:
823 sp_repr_unparent( dc->repr );
824 dc->repr = 0;
825 }
826 } else {
827 if (dc->repr) {
828 sp_repr_unparent(dc->repr);
829 dc->repr = 0;
830 }
831 }
834 if ( workDone ) {
835 DocumentUndo::done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ERASER,
836 _("Draw eraser stroke"));
837 } else {
838 DocumentUndo::cancel(sp_desktop_document(desktop));
839 }
840 }
842 static void
843 add_cap(SPCurve *curve,
844 Geom::Point const &pre, Geom::Point const &from,
845 Geom::Point const &to, Geom::Point const &post,
846 double rounding)
847 {
848 Geom::Point vel = rounding * Geom::rot90( to - from ) / sqrt(2.0);
849 double mag = Geom::L2(vel);
851 Geom::Point v_in = from - pre;
852 double mag_in = Geom::L2(v_in);
853 if ( mag_in > ERASER_EPSILON ) {
854 v_in = mag * v_in / mag_in;
855 } else {
856 v_in = Geom::Point(0, 0);
857 }
859 Geom::Point v_out = to - post;
860 double mag_out = Geom::L2(v_out);
861 if ( mag_out > ERASER_EPSILON ) {
862 v_out = mag * v_out / mag_out;
863 } else {
864 v_out = Geom::Point(0, 0);
865 }
867 if ( Geom::L2(v_in) > ERASER_EPSILON || Geom::L2(v_out) > ERASER_EPSILON ) {
868 curve->curveto(from + v_in, to + v_out, to);
869 }
870 }
872 static void
873 accumulate_eraser(SPEraserContext *dc)
874 {
875 if ( !dc->cal1->is_empty() && !dc->cal2->is_empty() ) {
876 dc->accumulated->reset(); /* Is this required ?? */
877 SPCurve *rev_cal2 = dc->cal2->create_reverse();
879 g_assert(dc->cal1->get_segment_count() > 0);
880 g_assert(rev_cal2->get_segment_count() > 0);
881 g_assert( ! dc->cal1->first_path()->closed() );
882 g_assert( ! rev_cal2->first_path()->closed() );
884 Geom::CubicBezier const * dc_cal1_firstseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->first_segment() );
885 Geom::CubicBezier const * rev_cal2_firstseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->first_segment() );
886 Geom::CubicBezier const * dc_cal1_lastseg = dynamic_cast<Geom::CubicBezier const *>( dc->cal1->last_segment() );
887 Geom::CubicBezier const * rev_cal2_lastseg = dynamic_cast<Geom::CubicBezier const *>( rev_cal2->last_segment() );
888 g_assert( dc_cal1_firstseg );
889 g_assert( rev_cal2_firstseg );
890 g_assert( dc_cal1_lastseg );
891 g_assert( rev_cal2_lastseg );
893 dc->accumulated->append(dc->cal1, FALSE);
895 add_cap(dc->accumulated, (*dc_cal1_lastseg)[2], (*dc_cal1_lastseg)[3], (*rev_cal2_firstseg)[0], (*rev_cal2_firstseg)[1], dc->cap_rounding);
897 dc->accumulated->append(rev_cal2, TRUE);
899 add_cap(dc->accumulated, (*rev_cal2_lastseg)[2], (*rev_cal2_lastseg)[3], (*dc_cal1_firstseg)[0], (*dc_cal1_firstseg)[1], dc->cap_rounding);
901 dc->accumulated->closepath();
903 rev_cal2->unref();
905 dc->cal1->reset();
906 dc->cal2->reset();
907 }
908 }
910 static double square(double const x)
911 {
912 return x * x;
913 }
915 static void
916 fit_and_split(SPEraserContext *dc, gboolean release)
917 {
918 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
920 double const tolerance_sq = square( desktop->w2d().descrim() * TOLERANCE_ERASER );
922 #ifdef ERASER_VERBOSE
923 g_print("[F&S:R=%c]", release?'T':'F');
924 #endif
926 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
927 return; // just clicked
929 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
930 #define BEZIER_SIZE 4
931 #define BEZIER_MAX_BEZIERS 8
932 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
934 #ifdef ERASER_VERBOSE
935 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
936 dc->npoints, release ? "TRUE" : "FALSE");
937 #endif
939 /* Current eraser */
940 if ( dc->cal1->is_empty() || dc->cal2->is_empty() ) {
941 /* dc->npoints > 0 */
942 /* g_print("erasers(1|2) reset\n"); */
943 dc->cal1->reset();
944 dc->cal2->reset();
946 dc->cal1->moveto(dc->point1[0]);
947 dc->cal2->moveto(dc->point2[0]);
948 }
950 Geom::Point b1[BEZIER_MAX_LENGTH];
951 gint const nb1 = Geom::bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
952 tolerance_sq, BEZIER_MAX_BEZIERS);
953 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
955 Geom::Point b2[BEZIER_MAX_LENGTH];
956 gint const nb2 = Geom::bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
957 tolerance_sq, BEZIER_MAX_BEZIERS);
958 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
960 if ( nb1 != -1 && nb2 != -1 ) {
961 /* Fit and draw and reset state */
962 #ifdef ERASER_VERBOSE
963 g_print("nb1:%d nb2:%d\n", nb1, nb2);
964 #endif
965 /* CanvasShape */
966 if (! release) {
967 dc->currentcurve->reset();
968 dc->currentcurve->moveto(b1[0]);
969 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
970 dc->currentcurve->curveto(bp1[1],
971 bp1[2], bp1[3]);
972 }
973 dc->currentcurve->lineto(b2[BEZIER_SIZE*(nb2-1) + 3]);
974 for (Geom::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
975 dc->currentcurve->curveto(bp2[2], bp2[1], bp2[0]);
976 }
977 // FIXME: dc->segments is always NULL at this point??
978 if (!dc->segments) { // first segment
979 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
980 }
981 dc->currentcurve->closepath();
982 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
983 }
985 /* Current eraser */
986 for (Geom::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
987 dc->cal1->curveto(bp1[1], bp1[2], bp1[3]);
988 }
989 for (Geom::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
990 dc->cal2->curveto(bp2[1], bp2[2], bp2[3]);
991 }
992 } else {
993 /* fixme: ??? */
994 #ifdef ERASER_VERBOSE
995 g_print("[fit_and_split] failed to fit-cubic.\n");
996 #endif
997 draw_temporary_box(dc);
999 for (gint i = 1; i < dc->npoints; i++) {
1000 dc->cal1->lineto(dc->point1[i]);
1001 }
1002 for (gint i = 1; i < dc->npoints; i++) {
1003 dc->cal2->lineto(dc->point2[i]);
1004 }
1005 }
1007 /* Fit and draw and copy last point */
1008 #ifdef ERASER_VERBOSE
1009 g_print("[%d]Yup\n", dc->npoints);
1010 #endif
1011 if (!release) {
1012 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1013 gint eraserMode = prefs->getBool("/tools/eraser/mode") ? 1 : 0;
1014 g_assert(!dc->currentcurve->is_empty());
1016 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(desktop),
1017 SP_TYPE_CANVAS_BPATH,
1018 NULL);
1019 SPCurve *curve = dc->currentcurve->copy();
1020 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1021 curve->unref();
1023 guint32 fillColor = sp_desktop_get_color_tool (desktop, "/tools/eraser", true);
1024 //guint32 strokeColor = sp_desktop_get_color_tool (desktop, "/tools/eraser", false);
1025 double opacity = sp_desktop_get_master_opacity_tool (desktop, "/tools/eraser");
1026 double fillOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/eraser", true);
1027 //double strokeOpacity = sp_desktop_get_opacity_tool (desktop, "/tools/eraser", false);
1028 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1029 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1030 //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);
1031 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1032 /* fixme: Cannot we cascade it to root more clearly? */
1033 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), desktop);
1035 dc->segments = g_slist_prepend(dc->segments, cbp);
1037 if ( !eraserMode ) {
1038 sp_canvas_item_hide(cbp);
1039 sp_canvas_item_hide(dc->currentshape);
1040 }
1041 }
1043 dc->point1[0] = dc->point1[dc->npoints - 1];
1044 dc->point2[0] = dc->point2[dc->npoints - 1];
1045 dc->npoints = 1;
1046 } else {
1047 draw_temporary_box(dc);
1048 }
1049 }
1051 static void
1052 draw_temporary_box(SPEraserContext *dc)
1053 {
1054 dc->currentcurve->reset();
1056 dc->currentcurve->moveto(dc->point1[dc->npoints-1]);
1057 for (gint i = dc->npoints-2; i >= 0; i--) {
1058 dc->currentcurve->lineto(dc->point1[i]);
1059 }
1060 for (gint i = 0; i < dc->npoints; i++) {
1061 dc->currentcurve->lineto(dc->point2[i]);
1062 }
1063 if (dc->npoints >= 2) {
1064 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);
1065 }
1067 dc->currentcurve->closepath();
1068 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1069 }
1071 /*
1072 Local Variables:
1073 mode:c++
1074 c-file-style:"stroustrup"
1075 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1076 indent-tabs-mode:nil
1077 fill-column:99
1078 End:
1079 */
1080 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :