b787a965ca67d2db64f541f1ff8746423075a179
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 *
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 * Copyright (C) 2005-2007 bulia byak
18 * Copyright (C) 2006 MenTaLguY
19 * Copyright (C) 2008 Jon A. Cruz
20 *
21 * Released under GNU GPL, read the file 'COPYING' for more information
22 */
24 #define noERASER_VERBOSE
26 #include "config.h"
28 #include <gtk/gtk.h>
29 #include <gdk/gdkkeysyms.h>
30 #include <glibmm/i18n.h>
31 #include <string>
32 #include <cstring>
33 #include <numeric>
35 #include "svg/svg.h"
36 #include "display/canvas-bpath.h"
37 #include "display/bezier-utils.h"
39 #include <glib/gmem.h>
40 #include "macros.h"
41 #include "document.h"
42 #include "selection.h"
43 #include "desktop.h"
44 #include "desktop-events.h"
45 #include "desktop-handles.h"
46 #include "desktop-affine.h"
47 #include "desktop-style.h"
48 #include "message-context.h"
49 #include "prefs-utils.h"
50 #include "pixmaps/cursor-eraser.xpm"
51 #include "libnr/n-art-bpath.h"
52 #include "libnr/nr-path.h"
53 #include "libnr/nr-matrix-ops.h"
54 #include "libnr/nr-scale-translate-ops.h"
55 #include "xml/repr.h"
56 #include "context-fns.h"
57 #include "sp-item.h"
58 #include "inkscape.h"
59 #include "color.h"
60 #include "splivarot.h"
61 #include "sp-item-group.h"
62 #include "sp-shape.h"
63 #include "sp-path.h"
64 #include "sp-text.h"
65 #include "display/canvas-bpath.h"
66 #include "display/canvas-arena.h"
67 #include "livarot/Shape.h"
68 #include "isnan.h"
70 #include "eraser-context.h"
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, gchar const *key, gchar const *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, NR::Point const &pre, NR::Point const &from, NR::Point const &to, NR::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, NR::Point p);
101 static NR::Point sp_eraser_get_npoint(SPEraserContext const *erc, NR::Point v);
102 static NR::Point sp_eraser_get_vpoint(SPEraserContext const *erc, NR::Point n);
103 static void draw_temporary_box(SPEraserContext *dc);
106 static SPEventContextClass *parent_class;
108 GtkType
109 sp_eraser_context_get_type(void)
110 {
111 static GType type = 0;
112 if (!type) {
113 GTypeInfo info = {
114 sizeof(SPEraserContextClass),
115 NULL, NULL,
116 (GClassInitFunc) sp_eraser_context_class_init,
117 NULL, NULL,
118 sizeof(SPEraserContext),
119 4,
120 (GInstanceInitFunc) sp_eraser_context_init,
121 NULL, /* value_table */
122 };
123 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPEraserContext", &info, (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 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 SPEventContext *event_context = SP_EVENT_CONTEXT(erc);
148 event_context->cursor_shape = cursor_eraser_xpm;
149 event_context->hot_x = 4;
150 event_context->hot_y = 4;
152 erc->accumulated = NULL;
153 erc->segments = NULL;
154 erc->currentcurve = NULL;
155 erc->currentshape = NULL;
156 erc->npoints = 0;
157 erc->cal1 = NULL;
158 erc->cal2 = NULL;
159 erc->repr = NULL;
161 /* Eraser values */
162 erc->cur = NR::Point(0,0);
163 erc->last = NR::Point(0,0);
164 erc->vel = NR::Point(0,0);
165 erc->vel_max = 0;
166 erc->acc = NR::Point(0,0);
167 erc->ang = NR::Point(0,0);
168 erc->del = NR::Point(0,0);
170 /* attributes */
171 erc->dragging = FALSE;
173 erc->mass = 0.3;
174 erc->drag = DRAG_DEFAULT;
175 erc->angle = 30.0;
176 erc->width = 0.2;
177 erc->pressure = ERC_DEFAULT_PRESSURE;
179 erc->vel_thin = 0.1;
180 erc->flatness = 0.9;
181 erc->cap_rounding = 0.0;
183 erc->abs_width = false;
184 }
186 static void
187 sp_eraser_context_dispose(GObject *object)
188 {
189 SPEraserContext *erc = SP_ERASER_CONTEXT(object);
191 if (erc->accumulated) {
192 erc->accumulated = sp_curve_unref(erc->accumulated);
193 }
195 while (erc->segments) {
196 gtk_object_destroy(GTK_OBJECT(erc->segments->data));
197 erc->segments = g_slist_remove(erc->segments, erc->segments->data);
198 }
200 if (erc->currentcurve) erc->currentcurve = sp_curve_unref(erc->currentcurve);
201 if (erc->cal1) erc->cal1 = sp_curve_unref(erc->cal1);
202 if (erc->cal2) erc->cal2 = sp_curve_unref(erc->cal2);
204 if (erc->currentshape) {
205 gtk_object_destroy(GTK_OBJECT(erc->currentshape));
206 erc->currentshape = NULL;
207 }
209 if (erc->_message_context) {
210 delete erc->_message_context;
211 }
213 G_OBJECT_CLASS(parent_class)->dispose(object);
214 }
216 static void
217 sp_eraser_context_setup(SPEventContext *ec)
218 {
219 SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
221 if (((SPEventContextClass *) parent_class)->setup)
222 ((SPEventContextClass *) parent_class)->setup(ec);
224 erc->accumulated = sp_curve_new_sized(32);
225 erc->currentcurve = sp_curve_new_sized(4);
227 erc->cal1 = sp_curve_new_sized(32);
228 erc->cal2 = sp_curve_new_sized(32);
230 erc->currentshape = sp_canvas_item_new(sp_desktop_sketch(ec->desktop), SP_TYPE_CANVAS_BPATH, NULL);
231 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(erc->currentshape), ERC_RED_RGBA, SP_WIND_RULE_EVENODD);
232 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(erc->currentshape), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
233 /* fixme: Cannot we cascade it to root more clearly? */
234 g_signal_connect(G_OBJECT(erc->currentshape), "event", G_CALLBACK(sp_desktop_root_handler), ec->desktop);
236 /*
237 static ProfileFloatElement f_profile[PROFILE_FLOAT_SIZE] = {
238 {"mass",0.02, 0.0, 1.0},
239 {"wiggle",0.0, 0.0, 1.0},
240 {"angle",30.0, -90.0, 90.0},
241 {"thinning",0.1, -1.0, 1.0},
242 {"tremor",0.0, 0.0, 1.0},
243 {"flatness",0.9, 0.0, 1.0},
244 {"cap_rounding",0.0, 0.0, 5.0}
245 };
246 */
248 sp_event_context_read(ec, "mass");
249 sp_event_context_read(ec, "wiggle");
250 sp_event_context_read(ec, "angle");
251 sp_event_context_read(ec, "width");
252 sp_event_context_read(ec, "thinning");
253 sp_event_context_read(ec, "tremor");
254 sp_event_context_read(ec, "flatness");
255 sp_event_context_read(ec, "tracebackground");
256 sp_event_context_read(ec, "usepressure");
257 sp_event_context_read(ec, "usetilt");
258 sp_event_context_read(ec, "abs_width");
259 sp_event_context_read(ec, "cap_rounding");
261 erc->is_drawing = false;
263 erc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
265 if (prefs_get_int_attribute("tools.eraser", "selcue", 0) != 0) {
266 ec->enableSelectionCue();
267 }
268 // TODO temp force:
269 ec->enableSelectionCue();
271 }
273 static void
274 sp_eraser_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
275 {
276 SPEraserContext *erc = SP_ERASER_CONTEXT(ec);
278 if (!strcmp(key, "mass")) {
279 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.2 );
280 erc->mass = CLAMP(dval, -1000.0, 1000.0);
281 } else if (!strcmp(key, "wiggle")) {
282 double const dval = ( val ? g_ascii_strtod (val, NULL) : (1 - DRAG_DEFAULT));
283 erc->drag = CLAMP((1 - dval), DRAG_MIN, DRAG_MAX); // drag is inverse to wiggle
284 } else if (!strcmp(key, "angle")) {
285 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0);
286 erc->angle = CLAMP (dval, -90, 90);
287 } else if (!strcmp(key, "width")) {
288 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
289 erc->width = CLAMP(dval, -1000.0, 1000.0);
290 } else if (!strcmp(key, "thinning")) {
291 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.1 );
292 erc->vel_thin = CLAMP(dval, -1.0, 1.0);
293 } else if (!strcmp(key, "tremor")) {
294 double const dval = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
295 erc->tremor = CLAMP(dval, 0.0, 1.0);
296 } else if (!strcmp(key, "flatness")) {
297 double const dval = ( val ? g_ascii_strtod (val, NULL) : 1.0 );
298 erc->flatness = CLAMP(dval, 0, 1.0);
299 } else if (!strcmp(key, "usepressure")) {
300 erc->usepressure = (val && strcmp(val, "0"));
301 } else if (!strcmp(key, "usetilt")) {
302 erc->usetilt = (val && strcmp(val, "0"));
303 } else if (!strcmp(key, "abs_width")) {
304 erc->abs_width = (val && strcmp(val, "0"));
305 } else if (!strcmp(key, "cap_rounding")) {
306 erc->cap_rounding = ( val ? g_ascii_strtod (val, NULL) : 0.0 );
307 }
309 //g_print("ERC: %g %g %g %g\n", erc->mass, erc->drag, erc->angle, erc->width);
310 }
312 static double
313 flerp(double f0, double f1, double p)
314 {
315 return f0 + ( f1 - f0 ) * p;
316 }
318 /* Get normalized point */
319 static NR::Point
320 sp_eraser_get_npoint(SPEraserContext const *dc, NR::Point v)
321 {
322 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
323 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
324 return NR::Point(( v[NR::X] - drect.min()[NR::X] ) / max, ( v[NR::Y] - drect.min()[NR::Y] ) / max);
325 }
327 /* Get view point */
328 static NR::Point
329 sp_eraser_get_vpoint(SPEraserContext const *dc, NR::Point n)
330 {
331 NR::Rect drect = SP_EVENT_CONTEXT(dc)->desktop->get_display_area();
332 double const max = MAX ( drect.dimensions()[NR::X], drect.dimensions()[NR::Y] );
333 return NR::Point(n[NR::X] * max + drect.min()[NR::X], n[NR::Y] * max + drect.min()[NR::Y]);
334 }
336 static void
337 sp_eraser_reset(SPEraserContext *dc, NR::Point p)
338 {
339 dc->last = dc->cur = sp_eraser_get_npoint(dc, p);
340 dc->vel = NR::Point(0,0);
341 dc->vel_max = 0;
342 dc->acc = NR::Point(0,0);
343 dc->ang = NR::Point(0,0);
344 dc->del = NR::Point(0,0);
345 }
347 static void
348 sp_eraser_extinput(SPEraserContext *dc, GdkEvent *event)
349 {
350 if (gdk_event_get_axis (event, GDK_AXIS_PRESSURE, &dc->pressure))
351 dc->pressure = CLAMP (dc->pressure, ERC_MIN_PRESSURE, ERC_MAX_PRESSURE);
352 else
353 dc->pressure = ERC_DEFAULT_PRESSURE;
355 if (gdk_event_get_axis (event, GDK_AXIS_XTILT, &dc->xtilt))
356 dc->xtilt = CLAMP (dc->xtilt, ERC_MIN_TILT, ERC_MAX_TILT);
357 else
358 dc->xtilt = ERC_DEFAULT_TILT;
360 if (gdk_event_get_axis (event, GDK_AXIS_YTILT, &dc->ytilt))
361 dc->ytilt = CLAMP (dc->ytilt, ERC_MIN_TILT, ERC_MAX_TILT);
362 else
363 dc->ytilt = ERC_DEFAULT_TILT;
364 }
367 static gboolean
368 sp_eraser_apply(SPEraserContext *dc, NR::Point p)
369 {
370 NR::Point n = sp_eraser_get_npoint(dc, p);
372 /* Calculate mass and drag */
373 double const mass = flerp(1.0, 160.0, dc->mass);
374 double const drag = flerp(0.0, 0.5, dc->drag * dc->drag);
376 /* Calculate force and acceleration */
377 NR::Point force = n - dc->cur;
379 // If force is below the absolute threshold ERASER_EPSILON,
380 // or we haven't yet reached ERASER_VEL_START (i.e. at the beginning of stroke)
381 // _and_ the force is below the (higher) ERASER_EPSILON_START threshold,
382 // discard this move.
383 // This prevents flips, blobs, and jerks caused by microscopic tremor of the tablet pen,
384 // especially bothersome at the start of the stroke where we don't yet have the inertia to
385 // smooth them out.
386 if ( NR::L2(force) < ERASER_EPSILON || (dc->vel_max < ERASER_VEL_START && NR::L2(force) < ERASER_EPSILON_START)) {
387 return FALSE;
388 }
390 dc->acc = force / mass;
392 /* Calculate new velocity */
393 dc->vel += dc->acc;
395 if (NR::L2(dc->vel) > dc->vel_max)
396 dc->vel_max = NR::L2(dc->vel);
398 /* Calculate angle of drawing tool */
400 double a1;
401 if (dc->usetilt) {
402 // 1a. calculate nib angle from input device tilt:
403 gdouble length = std::sqrt(dc->xtilt*dc->xtilt + dc->ytilt*dc->ytilt);;
405 if (length > 0) {
406 NR::Point ang1 = NR::Point(dc->ytilt/length, dc->xtilt/length);
407 a1 = atan2(ang1);
408 }
409 else
410 a1 = 0.0;
411 }
412 else {
413 // 1b. fixed dc->angle (absolutely flat nib):
414 double const radians = ( (dc->angle - 90) / 180.0 ) * M_PI;
415 NR::Point ang1 = NR::Point(-sin(radians), cos(radians));
416 a1 = atan2(ang1);
417 }
419 // 2. perpendicular to dc->vel (absolutely non-flat nib):
420 gdouble const mag_vel = NR::L2(dc->vel);
421 if ( mag_vel < ERASER_EPSILON ) {
422 return FALSE;
423 }
424 NR::Point ang2 = NR::rot90(dc->vel) / mag_vel;
426 // 3. Average them using flatness parameter:
427 // calculate angles
428 double a2 = atan2(ang2);
429 // flip a2 to force it to be in the same half-circle as a1
430 bool flipped = false;
431 if (fabs (a2-a1) > 0.5*M_PI) {
432 a2 += M_PI;
433 flipped = true;
434 }
435 // normalize a2
436 if (a2 > M_PI)
437 a2 -= 2*M_PI;
438 if (a2 < -M_PI)
439 a2 += 2*M_PI;
440 // find the flatness-weighted bisector angle, unflip if a2 was flipped
441 // FIXME: when dc->vel is oscillating around the fixed angle, the new_ang flips back and forth. How to avoid this?
442 double new_ang = a1 + (1 - dc->flatness) * (a2 - a1) - (flipped? M_PI : 0);
444 // Try to detect a sudden flip when the new angle differs too much from the previous for the
445 // current velocity; in that case discard this move
446 double angle_delta = NR::L2(NR::Point (cos (new_ang), sin (new_ang)) - dc->ang);
447 if ( angle_delta / NR::L2(dc->vel) > 4000 ) {
448 return FALSE;
449 }
451 // convert to point
452 dc->ang = NR::Point (cos (new_ang), sin (new_ang));
454 // g_print ("force %g acc %g vel_max %g vel %g a1 %g a2 %g new_ang %g\n", NR::L2(force), NR::L2(dc->acc), dc->vel_max, NR::L2(dc->vel), a1, a2, new_ang);
456 /* Apply drag */
457 dc->vel *= 1.0 - drag;
459 /* Update position */
460 dc->last = dc->cur;
461 dc->cur += dc->vel;
463 return TRUE;
464 }
466 static void
467 sp_eraser_brush(SPEraserContext *dc)
468 {
469 g_assert( dc->npoints >= 0 && dc->npoints < SAMPLING_SIZE );
471 // How much velocity thins strokestyle
472 double vel_thin = flerp (0, 160, dc->vel_thin);
474 // Influence of pressure on thickness
475 double pressure_thick = (dc->usepressure ? dc->pressure : 1.0);
477 // get the real brush point, not the same as pointer (affected by hatch tracking and/or mass
478 // drag)
479 NR::Point brush = sp_eraser_get_vpoint(dc, dc->cur);
480 NR::Point brush_w = SP_EVENT_CONTEXT(dc)->desktop->d2w(brush);
482 double trace_thick = 1;
484 double width = (pressure_thick * trace_thick - vel_thin * NR::L2(dc->vel)) * dc->width;
486 double tremble_left = 0, tremble_right = 0;
487 if (dc->tremor > 0) {
488 // obtain two normally distributed random variables, using polar Box-Muller transform
489 double x1, x2, w, y1, y2;
490 do {
491 x1 = 2.0 * g_random_double_range(0,1) - 1.0;
492 x2 = 2.0 * g_random_double_range(0,1) - 1.0;
493 w = x1 * x1 + x2 * x2;
494 } while ( w >= 1.0 );
495 w = sqrt( (-2.0 * log( w ) ) / w );
496 y1 = x1 * w;
497 y2 = x2 * w;
499 // deflect both left and right edges randomly and independently, so that:
500 // (1) dc->tremor=1 corresponds to sigma=1, decreasing dc->tremor narrows the bell curve;
501 // (2) deflection depends on width, but is upped for small widths for better visual uniformity across widths;
502 // (3) deflection somewhat depends on speed, to prevent fast strokes looking
503 // comparatively smooth and slow ones excessively jittery
504 tremble_left = (y1)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
505 tremble_right = (y2)*dc->tremor * (0.15 + 0.8*width) * (0.35 + 14*NR::L2(dc->vel));
506 }
508 if ( width < 0.02 * dc->width ) {
509 width = 0.02 * dc->width;
510 }
512 double dezoomify_factor = 0.05 * 1000;
513 if (!dc->abs_width) {
514 dezoomify_factor /= SP_EVENT_CONTEXT(dc)->desktop->current_zoom();
515 }
517 NR::Point del_left = dezoomify_factor * (width + tremble_left) * dc->ang;
518 NR::Point del_right = dezoomify_factor * (width + tremble_right) * dc->ang;
520 dc->point1[dc->npoints] = brush + del_left;
521 dc->point2[dc->npoints] = brush - del_right;
523 dc->del = 0.5*(del_left + del_right);
525 dc->npoints++;
526 }
528 void
529 sp_erc_update_toolbox (SPDesktop *desktop, const gchar *id, double value)
530 {
531 desktop->setToolboxAdjustmentValue (id, value);
532 }
534 static void
535 eraser_cancel(SPEraserContext *dc)
536 {
537 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
538 dc->dragging = FALSE;
539 dc->is_drawing = false;
540 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
541 /* Remove all temporary line segments */
542 while (dc->segments) {
543 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
544 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
545 }
546 /* reset accumulated curve */
547 sp_curve_reset(dc->accumulated);
548 clear_current(dc);
549 if (dc->repr) {
550 dc->repr = NULL;
551 }
552 }
555 gint
556 sp_eraser_context_root_handler(SPEventContext *event_context,
557 GdkEvent *event)
558 {
559 SPEraserContext *dc = SP_ERASER_CONTEXT(event_context);
560 SPDesktop *desktop = event_context->desktop;
562 gint ret = FALSE;
564 switch (event->type) {
565 case GDK_BUTTON_PRESS:
566 if (event->button.button == 1 && !event_context->space_panning) {
568 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
570 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
571 return TRUE;
572 }
574 NR::Point const button_w(event->button.x,
575 event->button.y);
576 NR::Point const button_dt(desktop->w2d(button_w));
577 sp_eraser_reset(dc, button_dt);
578 sp_eraser_extinput(dc, event);
579 sp_eraser_apply(dc, button_dt);
580 sp_curve_reset(dc->accumulated);
581 if (dc->repr) {
582 dc->repr = NULL;
583 }
585 /* initialize first point */
586 dc->npoints = 0;
588 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
589 ( GDK_KEY_PRESS_MASK |
590 GDK_BUTTON_RELEASE_MASK |
591 GDK_POINTER_MOTION_MASK |
592 GDK_BUTTON_PRESS_MASK ),
593 NULL,
594 event->button.time);
596 ret = TRUE;
598 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 3);
599 dc->is_drawing = true;
600 }
601 break;
602 case GDK_MOTION_NOTIFY:
603 {
604 NR::Point const motion_w(event->motion.x,
605 event->motion.y);
606 NR::Point motion_dt(desktop->w2d(motion_w));
607 sp_eraser_extinput(dc, event);
609 dc->_message_context->clear();
611 if ( dc->is_drawing && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
612 dc->dragging = TRUE;
614 dc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drawing</b> a eraser stroke"));
616 if (!sp_eraser_apply(dc, motion_dt)) {
617 ret = TRUE;
618 break;
619 }
621 if ( dc->cur != dc->last ) {
622 sp_eraser_brush(dc);
623 g_assert( dc->npoints > 0 );
624 fit_and_split(dc, FALSE);
625 }
626 ret = TRUE;
627 }
628 }
629 break;
632 case GDK_BUTTON_RELEASE:
633 {
634 NR::Point const motion_w(event->button.x, event->button.y);
635 NR::Point const motion_dt(desktop->w2d(motion_w));
637 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
638 sp_canvas_end_forced_full_redraws(desktop->canvas);
639 dc->is_drawing = false;
641 if (dc->dragging && event->button.button == 1 && !event_context->space_panning) {
642 dc->dragging = FALSE;
644 sp_eraser_apply(dc, motion_dt);
646 /* Remove all temporary line segments */
647 while (dc->segments) {
648 gtk_object_destroy(GTK_OBJECT(dc->segments->data));
649 dc->segments = g_slist_remove(dc->segments, dc->segments->data);
650 }
652 /* Create object */
653 fit_and_split(dc, TRUE);
654 accumulate_eraser(dc);
655 set_to_accumulated(dc); // performs document_done
657 /* reset accumulated curve */
658 sp_curve_reset(dc->accumulated);
660 clear_current(dc);
661 if (dc->repr) {
662 dc->repr = NULL;
663 }
665 dc->_message_context->clear();
666 ret = TRUE;
667 }
668 break;
669 }
671 case GDK_KEY_PRESS:
672 switch (get_group0_keyval (&event->key)) {
673 case GDK_Up:
674 case GDK_KP_Up:
675 if (!MOD__CTRL_ONLY) {
676 dc->angle += 5.0;
677 if (dc->angle > 90.0)
678 dc->angle = 90.0;
679 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
680 ret = TRUE;
681 }
682 break;
683 case GDK_Down:
684 case GDK_KP_Down:
685 if (!MOD__CTRL_ONLY) {
686 dc->angle -= 5.0;
687 if (dc->angle < -90.0)
688 dc->angle = -90.0;
689 sp_erc_update_toolbox (desktop, "eraser-angle", dc->angle);
690 ret = TRUE;
691 }
692 break;
693 case GDK_Right:
694 case GDK_KP_Right:
695 if (!MOD__CTRL_ONLY) {
696 dc->width += 0.01;
697 if (dc->width > 1.0)
698 dc->width = 1.0;
699 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100); // the same spinbutton is for alt+x
700 ret = TRUE;
701 }
702 break;
703 case GDK_Left:
704 case GDK_KP_Left:
705 if (!MOD__CTRL_ONLY) {
706 dc->width -= 0.01;
707 if (dc->width < 0.01)
708 dc->width = 0.01;
709 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
710 ret = TRUE;
711 }
712 break;
713 case GDK_Home:
714 case GDK_KP_Home:
715 dc->width = 0.01;
716 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
717 ret = TRUE;
718 break;
719 case GDK_End:
720 case GDK_KP_End:
721 dc->width = 1.0;
722 sp_erc_update_toolbox (desktop, "altx-eraser", dc->width * 100);
723 ret = TRUE;
724 break;
725 case GDK_x:
726 case GDK_X:
727 if (MOD__ALT_ONLY) {
728 desktop->setToolboxFocusTo ("altx-eraser");
729 ret = TRUE;
730 }
731 break;
732 case GDK_Escape:
733 if (dc->is_drawing) {
734 // if drawing, cancel, otherwise pass it up for deselecting
735 eraser_cancel (dc);
736 ret = TRUE;
737 }
738 break;
739 case GDK_z:
740 case GDK_Z:
741 if (MOD__CTRL_ONLY && dc->is_drawing) {
742 // if drawing, cancel, otherwise pass it up for undo
743 eraser_cancel (dc);
744 ret = TRUE;
745 }
746 break;
747 default:
748 break;
749 }
750 break;
752 case GDK_KEY_RELEASE:
753 switch (get_group0_keyval(&event->key)) {
754 case GDK_Control_L:
755 case GDK_Control_R:
756 dc->_message_context->clear();
757 break;
758 default:
759 break;
760 }
762 default:
763 break;
764 }
766 if (!ret) {
767 if (((SPEventContextClass *) parent_class)->root_handler) {
768 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
769 }
770 }
772 return ret;
773 }
776 static void
777 clear_current(SPEraserContext *dc)
778 {
779 /* reset bpath */
780 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), NULL);
781 /* reset curve */
782 sp_curve_reset(dc->currentcurve);
783 sp_curve_reset(dc->cal1);
784 sp_curve_reset(dc->cal2);
785 /* reset points */
786 dc->npoints = 0;
787 }
789 static void
790 set_to_accumulated(SPEraserContext *dc)
791 {
792 SPDesktop *desktop = SP_EVENT_CONTEXT(dc)->desktop;
793 bool workDone = false;
795 if (!sp_curve_empty(dc->accumulated)) {
796 NArtBpath *abp;
797 gchar *str;
799 if (!dc->repr) {
800 /* Create object */
801 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
802 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
804 /* Set style */
805 sp_desktop_apply_style_tool (desktop, repr, "tools.eraser", false);
807 dc->repr = repr;
809 SPItem *item=SP_ITEM(desktop->currentLayer()->appendChildRepr(dc->repr));
810 Inkscape::GC::release(dc->repr);
811 item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
812 item->updateRepr();
813 }
814 abp = nr_artpath_affine(sp_curve_first_bpath(dc->accumulated), sp_desktop_dt2root_affine(desktop));
815 str = sp_svg_write_path(abp);
816 g_assert( str != NULL );
817 g_free(abp);
818 dc->repr->setAttribute("d", str);
819 g_free(str);
821 if ( dc->repr ) {
822 bool wasSelection = false;
823 Inkscape::Selection *selection = sp_desktop_selection(desktop);
824 gint eraserMode = (prefs_get_int_attribute("tools.eraser", "mode", 0) != 0) ? 1 : 0;
825 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
827 SPItem* acid = SP_ITEM(desktop->doc()->getObjectByRepr(dc->repr));
828 NR::Maybe<NR::Rect> eraserBbox = acid->getBounds(NR::identity());
829 NR::Rect bounds = (*eraserBbox) * desktop->doc2dt();
830 std::vector<SPItem*> remainingItems;
831 GSList* toWorkOn = 0;
832 if (selection->isEmpty()) {
833 toWorkOn = sp_document_partial_items_in_box(sp_desktop_document(desktop), desktop->dkey, bounds);
834 toWorkOn = g_slist_remove( toWorkOn, acid );
835 } else {
836 toWorkOn = g_slist_copy(const_cast<GSList*>(selection->itemList()));
837 wasSelection = true;
838 }
840 if ( g_slist_length(toWorkOn) > 0 ) {
841 for (GSList *i = toWorkOn ; i ; i = i->next ) {
842 SPItem *item = SP_ITEM(i->data);
843 NR::Maybe<NR::Rect> bbox = item->getBounds(NR::identity());
844 if (bbox && bbox->intersects(*eraserBbox)) {
845 Inkscape::XML::Node* dup = dc->repr->duplicate(xml_doc);
846 dc->repr->parent()->appendChild(dup);
847 Inkscape::GC::release(dup); // parent takes over
849 selection->set(item);
850 selection->add(dup);
851 sp_selected_path_diff_skip_undo();
852 workDone = true; // TODO set this only if something was cut.
853 if ( !selection->isEmpty() ) {
854 // If the item was not completely erased, track the new remainder.
855 GSList *nowSel = g_slist_copy(const_cast<GSList *>(selection->itemList()));
856 for (GSList const *i2 = nowSel ; i2 ; i2 = i2->next ) {
857 remainingItems.push_back(SP_ITEM(i2->data));
858 }
859 g_slist_free(nowSel);
860 }
861 } else {
862 remainingItems.push_back(item);
863 }
864 }
866 g_slist_free(toWorkOn);
868 selection->clear();
869 if ( wasSelection ) {
870 if ( !remainingItems.empty() ) {
871 selection->add(remainingItems.begin(), remainingItems.end());
872 }
873 }
874 }
876 // Remove the eraser stroke itself:
877 sp_repr_unparent( dc->repr );
878 dc->repr = 0;
879 }
880 // SP_OBJECT(item)->deleteObject(propagate, propagate_descendants);
881 // sp_object_unref((SPObject *)item, NULL);
882 } else {
883 if (dc->repr) {
884 sp_repr_unparent(dc->repr);
885 dc->repr = 0;
886 }
887 }
890 if ( workDone ) {
891 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ERASER,
892 _("Draw eraser stroke"));
893 } else {
894 sp_document_cancel(sp_desktop_document(desktop));
895 }
896 }
898 static void
899 add_cap(SPCurve *curve,
900 NR::Point const &pre, NR::Point const &from,
901 NR::Point const &to, NR::Point const &post,
902 double rounding)
903 {
904 NR::Point vel = rounding * NR::rot90( to - from ) / sqrt(2.0);
905 double mag = NR::L2(vel);
907 NR::Point v_in = from - pre;
908 double mag_in = NR::L2(v_in);
909 if ( mag_in > ERASER_EPSILON ) {
910 v_in = mag * v_in / mag_in;
911 } else {
912 v_in = NR::Point(0, 0);
913 }
915 NR::Point v_out = to - post;
916 double mag_out = NR::L2(v_out);
917 if ( mag_out > ERASER_EPSILON ) {
918 v_out = mag * v_out / mag_out;
919 } else {
920 v_out = NR::Point(0, 0);
921 }
923 if ( NR::L2(v_in) > ERASER_EPSILON || NR::L2(v_out) > ERASER_EPSILON ) {
924 sp_curve_curveto(curve, from + v_in, to + v_out, to);
925 }
926 }
928 static void
929 accumulate_eraser(SPEraserContext *dc)
930 {
931 if ( !sp_curve_empty(dc->cal1) && !sp_curve_empty(dc->cal2) ) {
932 sp_curve_reset(dc->accumulated); /* Is this required ?? */
933 SPCurve *rev_cal2 = sp_curve_reverse(dc->cal2);
935 g_assert(dc->cal1->end > 1);
936 g_assert(rev_cal2->end > 1);
937 g_assert(SP_CURVE_SEGMENT(dc->cal1, 0)->code == NR_MOVETO_OPEN);
938 g_assert(SP_CURVE_SEGMENT(rev_cal2, 0)->code == NR_MOVETO_OPEN);
939 g_assert(SP_CURVE_SEGMENT(dc->cal1, 1)->code == NR_CURVETO);
940 g_assert(SP_CURVE_SEGMENT(rev_cal2, 1)->code == NR_CURVETO);
941 g_assert(SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->code == NR_CURVETO);
942 g_assert(SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->code == NR_CURVETO);
944 sp_curve_append(dc->accumulated, dc->cal1, FALSE);
946 add_cap(dc->accumulated, SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(2), SP_CURVE_SEGMENT(dc->cal1, dc->cal1->end-1)->c(3), SP_CURVE_SEGMENT(rev_cal2, 0)->c(3), SP_CURVE_SEGMENT(rev_cal2, 1)->c(1), dc->cap_rounding);
948 sp_curve_append(dc->accumulated, rev_cal2, TRUE);
950 add_cap(dc->accumulated, SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(2), SP_CURVE_SEGMENT(rev_cal2, rev_cal2->end-1)->c(3), SP_CURVE_SEGMENT(dc->cal1, 0)->c(3), SP_CURVE_SEGMENT(dc->cal1, 1)->c(1), dc->cap_rounding);
952 sp_curve_closepath(dc->accumulated);
954 sp_curve_unref(rev_cal2);
956 sp_curve_reset(dc->cal1);
957 sp_curve_reset(dc->cal2);
958 }
959 }
961 static double square(double const x)
962 {
963 return x * x;
964 }
966 static void
967 fit_and_split(SPEraserContext *dc, gboolean release)
968 {
969 double const tolerance_sq = square( NR::expansion(SP_EVENT_CONTEXT(dc)->desktop->w2d()) * TOLERANCE_ERASER );
971 #ifdef ERASER_VERBOSE
972 g_print("[F&S:R=%c]", release?'T':'F');
973 #endif
975 if (!( dc->npoints > 0 && dc->npoints < SAMPLING_SIZE ))
976 return; // just clicked
978 if ( dc->npoints == SAMPLING_SIZE - 1 || release ) {
979 #define BEZIER_SIZE 4
980 #define BEZIER_MAX_BEZIERS 8
981 #define BEZIER_MAX_LENGTH ( BEZIER_SIZE * BEZIER_MAX_BEZIERS )
983 #ifdef ERASER_VERBOSE
984 g_print("[F&S:#] dc->npoints:%d, release:%s\n",
985 dc->npoints, release ? "TRUE" : "FALSE");
986 #endif
988 /* Current eraser */
989 if ( dc->cal1->end == 0 || dc->cal2->end == 0 ) {
990 /* dc->npoints > 0 */
991 /* g_print("erasers(1|2) reset\n"); */
992 sp_curve_reset(dc->cal1);
993 sp_curve_reset(dc->cal2);
995 sp_curve_moveto(dc->cal1, dc->point1[0]);
996 sp_curve_moveto(dc->cal2, dc->point2[0]);
997 }
999 NR::Point b1[BEZIER_MAX_LENGTH];
1000 gint const nb1 = sp_bezier_fit_cubic_r(b1, dc->point1, dc->npoints,
1001 tolerance_sq, BEZIER_MAX_BEZIERS);
1002 g_assert( nb1 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b1)) );
1004 NR::Point b2[BEZIER_MAX_LENGTH];
1005 gint const nb2 = sp_bezier_fit_cubic_r(b2, dc->point2, dc->npoints,
1006 tolerance_sq, BEZIER_MAX_BEZIERS);
1007 g_assert( nb2 * BEZIER_SIZE <= gint(G_N_ELEMENTS(b2)) );
1009 if ( nb1 != -1 && nb2 != -1 ) {
1010 /* Fit and draw and reset state */
1011 #ifdef ERASER_VERBOSE
1012 g_print("nb1:%d nb2:%d\n", nb1, nb2);
1013 #endif
1014 /* CanvasShape */
1015 if (! release) {
1016 sp_curve_reset(dc->currentcurve);
1017 sp_curve_moveto(dc->currentcurve, b1[0]);
1018 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1019 sp_curve_curveto(dc->currentcurve, bp1[1],
1020 bp1[2], bp1[3]);
1021 }
1022 sp_curve_lineto(dc->currentcurve,
1023 b2[BEZIER_SIZE*(nb2-1) + 3]);
1024 for (NR::Point *bp2 = b2 + BEZIER_SIZE * ( nb2 - 1 ); bp2 >= b2; bp2 -= BEZIER_SIZE) {
1025 sp_curve_curveto(dc->currentcurve, bp2[2], bp2[1], bp2[0]);
1026 }
1027 // FIXME: dc->segments is always NULL at this point??
1028 if (!dc->segments) { // first segment
1029 add_cap(dc->currentcurve, b2[1], b2[0], b1[0], b1[1], dc->cap_rounding);
1030 }
1031 sp_curve_closepath(dc->currentcurve);
1032 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1033 }
1035 /* Current eraser */
1036 for (NR::Point *bp1 = b1; bp1 < b1 + BEZIER_SIZE * nb1; bp1 += BEZIER_SIZE) {
1037 sp_curve_curveto(dc->cal1, bp1[1], bp1[2], bp1[3]);
1038 }
1039 for (NR::Point *bp2 = b2; bp2 < b2 + BEZIER_SIZE * nb2; bp2 += BEZIER_SIZE) {
1040 sp_curve_curveto(dc->cal2, bp2[1], bp2[2], bp2[3]);
1041 }
1042 } else {
1043 /* fixme: ??? */
1044 #ifdef ERASER_VERBOSE
1045 g_print("[fit_and_split] failed to fit-cubic.\n");
1046 #endif
1047 draw_temporary_box(dc);
1049 for (gint i = 1; i < dc->npoints; i++) {
1050 sp_curve_lineto(dc->cal1, dc->point1[i]);
1051 }
1052 for (gint i = 1; i < dc->npoints; i++) {
1053 sp_curve_lineto(dc->cal2, dc->point2[i]);
1054 }
1055 }
1057 /* Fit and draw and copy last point */
1058 #ifdef ERASER_VERBOSE
1059 g_print("[%d]Yup\n", dc->npoints);
1060 #endif
1061 if (!release) {
1062 g_assert(!sp_curve_empty(dc->currentcurve));
1064 SPCanvasItem *cbp = sp_canvas_item_new(sp_desktop_sketch(SP_EVENT_CONTEXT(dc)->desktop),
1065 SP_TYPE_CANVAS_BPATH,
1066 NULL);
1067 SPCurve *curve = sp_curve_copy(dc->currentcurve);
1068 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH (cbp), curve);
1069 sp_curve_unref(curve);
1071 guint32 fillColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1072 //guint32 strokeColor = sp_desktop_get_color_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1073 double opacity = sp_desktop_get_master_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser");
1074 double fillOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", true);
1075 //double strokeOpacity = sp_desktop_get_opacity_tool (SP_ACTIVE_DESKTOP, "tools.eraser", false);
1076 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cbp), ((fillColor & 0xffffff00) | SP_COLOR_F_TO_U(opacity*fillOpacity)), SP_WIND_RULE_EVENODD);
1077 //on second thougtht don't do stroke yet because we don't have stoke-width yet and because stoke appears between segments while drawing
1078 //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);
1079 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cbp), 0x00000000, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1080 /* fixme: Cannot we cascade it to root more clearly? */
1081 g_signal_connect(G_OBJECT(cbp), "event", G_CALLBACK(sp_desktop_root_handler), SP_EVENT_CONTEXT(dc)->desktop);
1083 dc->segments = g_slist_prepend(dc->segments, cbp);
1084 }
1086 dc->point1[0] = dc->point1[dc->npoints - 1];
1087 dc->point2[0] = dc->point2[dc->npoints - 1];
1088 dc->npoints = 1;
1089 } else {
1090 draw_temporary_box(dc);
1091 }
1092 }
1094 static void
1095 draw_temporary_box(SPEraserContext *dc)
1096 {
1097 sp_curve_reset(dc->currentcurve);
1099 sp_curve_moveto(dc->currentcurve, dc->point1[dc->npoints-1]);
1100 for (gint i = dc->npoints-2; i >= 0; i--) {
1101 sp_curve_lineto(dc->currentcurve, dc->point1[i]);
1102 }
1103 for (gint i = 0; i < dc->npoints; i++) {
1104 sp_curve_lineto(dc->currentcurve, dc->point2[i]);
1105 }
1106 if (dc->npoints >= 2) {
1107 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);
1108 }
1110 sp_curve_closepath(dc->currentcurve);
1111 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(dc->currentshape), dc->currentcurve);
1112 }
1114 /*
1115 Local Variables:
1116 mode:c++
1117 c-file-style:"stroustrup"
1118 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1119 indent-tabs-mode:nil
1120 fill-column:99
1121 End:
1122 */
1123 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :