f6bb827434b81befb3a05879e34ed0b4e2f8c84a
1 /** \file
2 * Pencil event context implementation.
3 */
5 /*
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * bulia byak <buliabyak@users.sf.net>
9 *
10 * Copyright (C) 2000 Lauris Kaplinski
11 * Copyright (C) 2000-2001 Ximian, Inc.
12 * Copyright (C) 2002 Lauris Kaplinski
13 * Copyright (C) 2004 Monash University
14 *
15 * Released under GNU GPL, read the file 'COPYING' for more information
16 */
18 #include <gdk/gdkkeysyms.h>
20 #include "pencil-context.h"
21 #include "desktop.h"
22 #include "desktop-handles.h"
23 #include "selection.h"
24 #include "selection-chemistry.h"
25 #include "draw-anchor.h"
26 #include "message-stack.h"
27 #include "message-context.h"
28 #include "modifier-fns.h"
29 #include "sp-path.h"
30 #include "preferences.h"
31 #include "snap.h"
32 #include "pixmaps/cursor-pencil.xpm"
33 #include <2geom/sbasis-to-bezier.h>
34 #include <2geom/bezier-utils.h>
35 #include "display/canvas-bpath.h"
36 #include <glibmm/i18n.h>
37 #include "libnr/in-svg-plane.h"
38 #include "context-fns.h"
39 #include "sp-namedview.h"
40 #include "xml/repr.h"
41 #include "document.h"
42 #include "desktop-style.h"
43 #include "macros.h"
44 #include "display/curve.h"
45 #include "livarot/Path.h"
47 static void sp_pencil_context_class_init(SPPencilContextClass *klass);
48 static void sp_pencil_context_init(SPPencilContext *pc);
49 static void sp_pencil_context_setup(SPEventContext *ec);
50 static void sp_pencil_context_dispose(GObject *object);
52 static gint sp_pencil_context_root_handler(SPEventContext *event_context, GdkEvent *event);
53 static gint pencil_handle_button_press(SPPencilContext *const pc, GdkEventButton const &bevent);
54 static gint pencil_handle_motion_notify(SPPencilContext *const pc, GdkEventMotion const &mevent);
55 static gint pencil_handle_button_release(SPPencilContext *const pc, GdkEventButton const &revent);
56 static gint pencil_handle_key_press(SPPencilContext *const pc, guint const keyval, guint const state);
57 static gint pencil_handle_key_release(SPPencilContext *const pc, guint const keyval, guint const state);
59 static void spdc_set_startpoint(SPPencilContext *pc, Geom::Point const p);
60 static void spdc_set_endpoint(SPPencilContext *pc, Geom::Point const p);
61 static void spdc_finish_endpoint(SPPencilContext *pc);
62 static void spdc_add_freehand_point(SPPencilContext *pc, Geom::Point p, guint state);
63 static void fit_and_split(SPPencilContext *pc);
64 static void interpolate(SPPencilContext *pc);
65 static void sketch_interpolate(SPPencilContext *pc);
67 static SPDrawContextClass *pencil_parent_class;
68 static Geom::Point pencil_drag_origin_w(0, 0);
69 static bool pencil_within_tolerance = false;
71 /**
72 * Register SPPencilContext class with Gdk and return its type number.
73 */
74 GType
75 sp_pencil_context_get_type()
76 {
77 static GType type = 0;
78 if (!type) {
79 GTypeInfo info = {
80 sizeof(SPPencilContextClass),
81 NULL, NULL,
82 (GClassInitFunc) sp_pencil_context_class_init,
83 NULL, NULL,
84 sizeof(SPPencilContext),
85 4,
86 (GInstanceInitFunc) sp_pencil_context_init,
87 NULL, /* value_table */
88 };
89 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPencilContext", &info, (GTypeFlags)0);
90 }
91 return type;
92 }
94 /**
95 * Initialize SPPencilContext vtable.
96 */
97 static void
98 sp_pencil_context_class_init(SPPencilContextClass *klass)
99 {
100 GObjectClass *object_class;
101 SPEventContextClass *event_context_class;
103 object_class = (GObjectClass *) klass;
104 event_context_class = (SPEventContextClass *) klass;
106 pencil_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
108 object_class->dispose = sp_pencil_context_dispose;
110 event_context_class->setup = sp_pencil_context_setup;
111 event_context_class->root_handler = sp_pencil_context_root_handler;
112 }
114 /**
115 * Callback to initialize SPPencilContext object.
116 */
117 static void
118 sp_pencil_context_init(SPPencilContext *pc)
119 {
120 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
122 event_context->cursor_shape = cursor_pencil_xpm;
123 event_context->hot_x = 4;
124 event_context->hot_y = 4;
126 pc->npoints = 0;
127 pc->state = SP_PENCIL_CONTEXT_IDLE;
128 pc->req_tangent = Geom::Point(0, 0);
130 // since SPPencilContext is not properly constructed...
131 pc->sketch_interpolation = Geom::Piecewise<Geom::D2<Geom::SBasis> >();
132 pc->sketch_n = 0;
133 }
135 /**
136 * Callback to setup SPPencilContext object.
137 */
138 static void
139 sp_pencil_context_setup(SPEventContext *ec)
140 {
141 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
142 if (prefs->getBool("/tools/freehand/pencil/selcue")) {
143 ec->enableSelectionCue();
144 }
146 if (((SPEventContextClass *) pencil_parent_class)->setup) {
147 ((SPEventContextClass *) pencil_parent_class)->setup(ec);
148 }
150 SPPencilContext *const pc = SP_PENCIL_CONTEXT(ec);
151 pc->is_drawing = false;
153 pc->anchor_statusbar = false;
154 }
156 static void
157 sp_pencil_context_dispose(GObject *object)
158 {
159 G_OBJECT_CLASS(pencil_parent_class)->dispose(object);
160 }
162 /** Snaps new node relative to the previous node. */
163 static void
164 spdc_endpoint_snap(SPPencilContext const *pc, Geom::Point &p, guint const state)
165 {
166 if ((state & GDK_CONTROL_MASK)) { //CTRL enables constrained snapping
167 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
168 } else {
169 if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
170 //After all, the user explicitely asked for angular snapping by
171 //pressing CTRL
172 spdc_endpoint_snap_free(pc, p, state);
173 }
174 }
175 }
177 /**
178 * Callback for handling all pencil context events.
179 */
180 gint
181 sp_pencil_context_root_handler(SPEventContext *const ec, GdkEvent *event)
182 {
183 SPPencilContext *const pc = SP_PENCIL_CONTEXT(ec);
185 gint ret = FALSE;
187 switch (event->type) {
188 case GDK_BUTTON_PRESS:
189 ret = pencil_handle_button_press(pc, event->button);
190 break;
192 case GDK_MOTION_NOTIFY:
193 ret = pencil_handle_motion_notify(pc, event->motion);
194 break;
196 case GDK_BUTTON_RELEASE:
197 ret = pencil_handle_button_release(pc, event->button);
198 break;
200 case GDK_KEY_PRESS:
201 ret = pencil_handle_key_press(pc, get_group0_keyval (&event->key), event->key.state);
202 break;
204 case GDK_KEY_RELEASE:
205 ret = pencil_handle_key_release(pc, get_group0_keyval (&event->key), event->key.state);
206 break;
208 default:
209 break;
210 }
212 if (!ret) {
213 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
214 = ((SPEventContextClass *) pencil_parent_class)->root_handler;
215 if (parent_root_handler) {
216 ret = parent_root_handler(ec, event);
217 }
218 }
220 return ret;
221 }
223 static gint
224 pencil_handle_button_press(SPPencilContext *const pc, GdkEventButton const &bevent)
225 {
226 gint ret = FALSE;
227 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
228 if ( bevent.button == 1 && !event_context->space_panning) {
230 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
231 SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
232 Inkscape::Selection *selection = sp_desktop_selection(desktop);
234 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
235 return TRUE;
236 }
238 if (!pc->grab) {
239 /* Grab mouse, so release will not pass unnoticed */
240 pc->grab = SP_CANVAS_ITEM(desktop->acetate);
241 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
242 GDK_BUTTON_RELEASE_MASK |
243 GDK_POINTER_MOTION_MASK ),
244 NULL, bevent.time);
245 }
247 Geom::Point const button_w(bevent.x, bevent.y);
249 /* Find desktop coordinates */
250 Geom::Point p = pc->desktop->w2d(button_w);
252 /* Test whether we hit any anchor. */
253 SPDrawAnchor *anchor = spdc_test_inside(pc, button_w);
255 pencil_drag_origin_w = Geom::Point(bevent.x,bevent.y);
256 pencil_within_tolerance = true;
258 switch (pc->state) {
259 case SP_PENCIL_CONTEXT_ADDLINE:
260 /* Current segment will be finished with release */
261 ret = TRUE;
262 break;
263 default:
264 /* Set first point of sequence */
265 SnapManager &m = desktop->namedview->snap_manager;
266 m.setup(desktop);
268 if (bevent.state & GDK_CONTROL_MASK) {
269 if (!(bevent.state & GDK_SHIFT_MASK)) {
270 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
271 }
272 spdc_create_single_dot(event_context, p, "/tools/freehand/pencil", bevent.state);
273 ret = true;
274 break;
275 }
276 if (anchor) {
277 p = anchor->dp;
278 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
279 } else {
281 if (!(bevent.state & GDK_SHIFT_MASK)) {
282 // This is the first click of a new curve; deselect item so that
283 // this curve is not combined with it (unless it is drawn from its
284 // anchor, which is handled by the sibling branch above)
285 selection->clear();
286 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
287 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
288 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
289 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
290 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
291 }
292 }
293 pc->sa = anchor;
294 spdc_set_startpoint(pc, p);
295 ret = TRUE;
296 break;
297 }
299 pc->is_drawing = true;
300 }
301 return ret;
302 }
304 static gint
305 pencil_handle_motion_notify(SPPencilContext *const pc, GdkEventMotion const &mevent)
306 {
307 SPDesktop *const dt = pc->desktop;
309 if ((mevent.state & GDK_CONTROL_MASK) && (mevent.state & GDK_BUTTON1_MASK)) {
310 // mouse was accidentally moved during Ctrl+click;
311 // ignore the motion and create a single point
312 pc->is_drawing = false;
313 return TRUE;
314 }
315 gint ret = FALSE;
317 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
318 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
319 // allow scrolling
320 return FALSE;
321 }
323 if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab && pc->is_drawing) {
324 /* Grab mouse, so release will not pass unnoticed */
325 pc->grab = SP_CANVAS_ITEM(dt->acetate);
326 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
327 GDK_BUTTON_RELEASE_MASK |
328 GDK_POINTER_MOTION_MASK ),
329 NULL, mevent.time);
330 }
332 /* Find desktop coordinates */
333 Geom::Point p = dt->w2d(Geom::Point(mevent.x, mevent.y));
335 /* Test whether we hit any anchor. */
336 SPDrawAnchor *anchor = spdc_test_inside(pc, Geom::Point(mevent.x, mevent.y));
338 if (pencil_within_tolerance) {
339 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
340 gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
341 if ( Geom::LInfty( Geom::Point(mevent.x,mevent.y) - pencil_drag_origin_w ) < tolerance ) {
342 return FALSE; // Do not drag if we're within tolerance from origin.
343 }
344 }
346 // Once the user has moved farther than tolerance from the original location
347 // (indicating they intend to move the object, not click), then always process the
348 // motion notify coordinates as given (no snapping back to origin)
349 pencil_within_tolerance = false;
351 switch (pc->state) {
352 case SP_PENCIL_CONTEXT_ADDLINE:
353 /* Set red endpoint */
354 if (anchor) {
355 p = anchor->dp;
356 } else {
357 Geom::Point ptnr(p);
358 spdc_endpoint_snap(pc, ptnr, mevent.state);
359 p = ptnr;
360 }
361 spdc_set_endpoint(pc, p);
362 ret = TRUE;
363 break;
364 default:
365 /* We may be idle or already freehand */
366 if ( mevent.state & GDK_BUTTON1_MASK && pc->is_drawing ) {
367 if (pc->state == SP_PENCIL_CONTEXT_IDLE) {
368 sp_event_context_discard_delayed_snap_event(event_context);
369 }
370 pc->state = SP_PENCIL_CONTEXT_FREEHAND;
372 if ( !pc->sa && !pc->green_anchor ) {
373 /* Create green anchor */
374 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, pc->p[0]);
375 }
376 if (anchor) {
377 p = anchor->dp;
378 }
380 if ( pc->npoints != 0) { // buttonpress may have happened before we entered draw context!
381 spdc_add_freehand_point(pc, p, mevent.state);
382 ret = TRUE;
383 }
385 if (anchor && !pc->anchor_statusbar) {
386 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Release</b> here to close and finish the path."));
387 pc->anchor_statusbar = true;
388 } else if (!anchor && pc->anchor_statusbar) {
389 pc->_message_context->clear();
390 pc->anchor_statusbar = false;
391 } else if (!anchor) {
392 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Drawing a freehand path"));
393 }
395 } else {
396 if (anchor && !pc->anchor_statusbar) {
397 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag</b> to continue the path from this point."));
398 pc->anchor_statusbar = true;
399 } else if (!anchor && pc->anchor_statusbar) {
400 pc->_message_context->clear();
401 pc->anchor_statusbar = false;
402 }
403 }
405 // Show the pre-snap indicator to communicate to the user where we would snap to if he/she were to
406 // a) press the mousebutton to start a freehand drawing, or
407 // b) release the mousebutton to finish a freehand drawing
408 if (!sp_event_context_knot_mouseover(pc)) {
409 SnapManager &m = dt->namedview->snap_manager;
410 m.setup(dt);
411 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
412 }
413 break;
414 }
415 return ret;
416 }
418 static gint
419 pencil_handle_button_release(SPPencilContext *const pc, GdkEventButton const &revent)
420 {
421 gint ret = FALSE;
423 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
424 if ( revent.button == 1 && pc->is_drawing && !event_context->space_panning) {
425 SPDesktop *const dt = pc->desktop;
427 pc->is_drawing = false;
429 /* Find desktop coordinates */
430 Geom::Point p = dt->w2d(Geom::Point(revent.x, revent.y));
432 /* Test whether we hit any anchor. */
433 SPDrawAnchor *anchor = spdc_test_inside(pc, Geom::Point(revent.x,
434 revent.y));
436 switch (pc->state) {
437 case SP_PENCIL_CONTEXT_IDLE:
438 /* Releasing button in idle mode means single click */
439 /* We have already set up start point/anchor in button_press */
440 if (!(revent.state & GDK_CONTROL_MASK)) {
441 // Ctrl+click creates a single point so only set context in ADDLINE mode when Ctrl isn't pressed
442 pc->state = SP_PENCIL_CONTEXT_ADDLINE;
443 }
444 ret = TRUE;
445 break;
446 case SP_PENCIL_CONTEXT_ADDLINE:
447 /* Finish segment now */
448 if (anchor) {
449 p = anchor->dp;
450 } else {
451 spdc_endpoint_snap(pc, p, revent.state);
452 }
453 pc->ea = anchor;
454 spdc_set_endpoint(pc, p);
455 spdc_finish_endpoint(pc);
456 pc->state = SP_PENCIL_CONTEXT_IDLE;
457 sp_event_context_discard_delayed_snap_event(event_context);
458 ret = TRUE;
459 break;
460 case SP_PENCIL_CONTEXT_FREEHAND:
461 if (revent.state & GDK_MOD1_MASK) {
462 /* sketch mode: interpolate the sketched path and improve the current output path with the new interpolation. don't finish sketch */
464 sketch_interpolate(pc);
466 if (pc->green_anchor) {
467 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
468 }
470 pc->state = SP_PENCIL_CONTEXT_SKETCH;
471 } else {
472 /* Finish segment now */
473 /// \todo fixme: Clean up what follows (Lauris)
474 if (anchor) {
475 p = anchor->dp;
476 } else {
477 Geom::Point p_end = p;
478 spdc_endpoint_snap(pc, p_end, revent.state);
479 if (p_end != p) {
480 // then we must have snapped!
481 spdc_add_freehand_point(pc, p_end, revent.state);
482 }
483 }
485 pc->ea = anchor;
486 /* Write curves to object */
488 dt->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing freehand"));
490 interpolate(pc);
491 spdc_concat_colors_and_flush(pc, FALSE);
492 pc->sa = NULL;
493 pc->ea = NULL;
494 if (pc->green_anchor) {
495 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
496 }
497 pc->state = SP_PENCIL_CONTEXT_IDLE;
498 // reset sketch mode too
499 pc->sketch_n = 0;
500 }
501 ret = TRUE;
502 break;
503 case SP_PENCIL_CONTEXT_SKETCH:
504 default:
505 break;
506 }
508 if (pc->grab) {
509 /* Release grab now */
510 sp_canvas_item_ungrab(pc->grab, revent.time);
511 pc->grab = NULL;
512 }
514 ret = TRUE;
515 }
516 return ret;
517 }
519 static void
520 pencil_cancel (SPPencilContext *const pc)
521 {
522 if (pc->grab) {
523 /* Release grab now */
524 sp_canvas_item_ungrab(pc->grab, 0);
525 pc->grab = NULL;
526 }
528 pc->is_drawing = false;
529 pc->state = SP_PENCIL_CONTEXT_IDLE;
530 sp_event_context_discard_delayed_snap_event(SP_EVENT_CONTEXT(pc));
532 pc->red_curve->reset();
533 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
534 while (pc->green_bpaths) {
535 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
536 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
537 }
538 pc->green_curve->reset();
539 if (pc->green_anchor) {
540 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
541 }
543 pc->_message_context->clear();
544 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
546 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
547 }
549 static gint
550 pencil_handle_key_press(SPPencilContext *const pc, guint const keyval, guint const state)
551 {
552 gint ret = FALSE;
553 switch (keyval) {
554 case GDK_Up:
555 case GDK_Down:
556 case GDK_KP_Up:
557 case GDK_KP_Down:
558 // Prevent the zoom field from activation.
559 if (!mod_ctrl_only(state)) {
560 ret = TRUE;
561 }
562 break;
563 case GDK_Escape:
564 if (pc->npoints != 0) {
565 // if drawing, cancel, otherwise pass it up for deselecting
566 if (pc->state != SP_PENCIL_CONTEXT_IDLE) {
567 pencil_cancel (pc);
568 ret = TRUE;
569 }
570 }
571 break;
572 case GDK_z:
573 case GDK_Z:
574 if (mod_ctrl_only(state) && pc->npoints != 0) {
575 // if drawing, cancel, otherwise pass it up for undo
576 if (pc->state != SP_PENCIL_CONTEXT_IDLE) {
577 pencil_cancel (pc);
578 ret = TRUE;
579 }
580 }
581 break;
582 case GDK_g:
583 case GDK_G:
584 if (mod_shift_only(state)) {
585 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
586 ret = true;
587 }
588 break;
589 case GDK_Alt_L:
590 case GDK_Alt_R:
591 case GDK_Meta_L:
592 case GDK_Meta_R:
593 if (pc->state == SP_PENCIL_CONTEXT_IDLE) {
594 pc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("<b>Sketch mode</b>: holding <b>Alt</b> interpolates between sketched paths. Release <b>Alt</b> to finalize."));
595 }
596 break;
597 default:
598 break;
599 }
600 return ret;
601 }
603 static gint
604 pencil_handle_key_release(SPPencilContext *const pc, guint const keyval, guint const /*state*/)
605 {
606 gint ret = FALSE;
607 switch (keyval) {
608 case GDK_Alt_L:
609 case GDK_Alt_R:
610 case GDK_Meta_L:
611 case GDK_Meta_R:
612 if (pc->state == SP_PENCIL_CONTEXT_SKETCH) {
613 spdc_concat_colors_and_flush(pc, FALSE);
614 pc->sketch_n = 0;
615 pc->sa = NULL;
616 pc->ea = NULL;
617 if (pc->green_anchor) {
618 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
619 }
620 pc->state = SP_PENCIL_CONTEXT_IDLE;
621 sp_event_context_discard_delayed_snap_event(SP_EVENT_CONTEXT(pc));
622 pc->desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Finishing freehand sketch"));
623 ret = TRUE;
624 }
625 break;
626 default:
627 break;
628 }
629 return ret;
630 }
632 /**
633 * Reset points and set new starting point.
634 */
635 static void
636 spdc_set_startpoint(SPPencilContext *const pc, Geom::Point const p)
637 {
638 pc->npoints = 0;
639 pc->red_curve_is_valid = false;
640 if (in_svg_plane(p)) {
641 pc->p[pc->npoints++] = p;
642 pc->ps.push_back(p);
643 }
644 }
646 /**
647 * Change moving endpoint position.
648 * <ul>
649 * <li>Ctrl constrains to moving to H/V direction, snapping in given direction.
650 * <li>Otherwise we snap freely to whatever attractors are available.
651 * </ul>
652 *
653 * Number of points is (re)set to 2 always, 2nd point is modified.
654 * We change RED curve.
655 */
656 static void
657 spdc_set_endpoint(SPPencilContext *const pc, Geom::Point const p)
658 {
659 if (pc->npoints == 0) {
660 return;
661 /* May occur if first point wasn't in SVG plane (e.g. weird w2d transform, perhaps from bad
662 * zoom setting).
663 */
664 }
665 g_return_if_fail( pc->npoints > 0 );
667 pc->red_curve->reset();
668 if ( ( p == pc->p[0] )
669 || !in_svg_plane(p) )
670 {
671 pc->npoints = 1;
672 } else {
673 pc->p[1] = p;
674 pc->npoints = 2;
676 pc->red_curve->moveto(pc->p[0]);
677 pc->red_curve->lineto(pc->p[1]);
678 pc->red_curve_is_valid = true;
680 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
681 }
682 }
684 /**
685 * Finalize addline.
686 *
687 * \todo
688 * fixme: I'd like remove red reset from concat colors (lauris).
689 * Still not sure, how it will make most sense.
690 */
691 static void
692 spdc_finish_endpoint(SPPencilContext *const pc)
693 {
694 if ( ( pc->red_curve->is_empty() )
695 || ( *(pc->red_curve->first_point()) == *(pc->red_curve->second_point()) ) )
696 {
697 pc->red_curve->reset();
698 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
699 } else {
700 /* Write curves to object. */
701 spdc_concat_colors_and_flush(pc, FALSE);
702 pc->sa = NULL;
703 pc->ea = NULL;
704 }
705 }
708 static void
709 spdc_add_freehand_point(SPPencilContext *pc, Geom::Point p, guint /*state*/)
710 {
711 g_assert( pc->npoints > 0 );
712 g_return_if_fail(unsigned(pc->npoints) < G_N_ELEMENTS(pc->p));
714 if ( ( p != pc->p[ pc->npoints - 1 ] )
715 && in_svg_plane(p) )
716 {
717 pc->ps.push_back(p);
718 pc->p[pc->npoints++] = p;
719 fit_and_split(pc);
720 }
721 }
723 static inline double
724 square(double const x)
725 {
726 return x * x;
727 }
729 static void
730 interpolate(SPPencilContext *pc)
731 {
732 if ( pc->ps.size() <= 1 ) {
733 return;
734 }
736 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
737 double const tol = prefs->getDoubleLimited("/tools/freehand/pencil/tolerance", 10.0, 1.0, 100.0) * 0.4;
738 double const tolerance_sq = 0.02 * square( pc->desktop->w2d().descrim() *
739 tol) * exp(0.2*tol - 2);
741 g_assert(is_zero(pc->req_tangent)
742 || is_unit_vector(pc->req_tangent));
743 Geom::Point const tHatEnd(0, 0);
745 guint n_points = pc->ps.size();
746 pc->green_curve->reset();
747 pc->red_curve->reset();
748 pc->red_curve_is_valid = false;
750 Geom::Point * b = g_new(Geom::Point, 4*n_points);
751 Geom::Point * points = g_new(Geom::Point, 4*n_points);
752 for (unsigned int i = 0; i < pc->ps.size(); i++) {
753 points[i] = pc->ps[i];
754 }
756 // worst case gives us a segment per point
757 int max_segs = 4*n_points;
759 int const n_segs = Geom::bezier_fit_cubic_r(b, points, n_points,
760 tolerance_sq, max_segs);
762 if ( n_segs > 0)
763 {
764 /* Fit and draw and reset state */
765 pc->green_curve->moveto(b[0]);
766 for (int c = 0; c < n_segs; c++) {
767 pc->green_curve->curveto(b[4*c+1], b[4*c+2], b[4*c+3]);
768 }
769 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->green_curve);
771 /* Fit and draw and copy last point */
772 g_assert(!pc->green_curve->is_empty());
774 /* Set up direction of next curve. */
775 {
776 Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->green_curve->last_segment());
777 g_assert( last_seg ); // Relevance: validity of (*last_seg)[2]
778 pc->p[0] = last_seg->finalPoint();
779 pc->npoints = 1;
780 Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] );
781 pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) )
782 ? Geom::Point(0, 0)
783 : Geom::unit_vector(req_vec) );
784 }
785 }
786 g_free(b);
787 g_free(points);
788 pc->ps.clear();
789 }
792 /* interpolates the sketched curve and tweaks the current sketch interpolation*/
793 static void
794 sketch_interpolate(SPPencilContext *pc)
795 {
796 if ( pc->ps.size() <= 1 ) {
797 return;
798 }
800 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
801 double const tol = prefs->getDoubleLimited("/tools/freehand/pencil/tolerance", 10.0, 1.0, 100.0) * 0.4;
802 double const tolerance_sq = 0.02 * square( pc->desktop->w2d().descrim() *
803 tol) * exp(0.2*tol - 2);
805 bool average_all_sketches = prefs->getBool("/tools/freehand/pencil/average_all_sketches", true);
807 g_assert(is_zero(pc->req_tangent)
808 || is_unit_vector(pc->req_tangent));
809 Geom::Point const tHatEnd(0, 0);
811 guint n_points = pc->ps.size();
812 pc->red_curve->reset();
813 pc->red_curve_is_valid = false;
815 Geom::Point * b = g_new(Geom::Point, 4*n_points);
816 Geom::Point * points = g_new(Geom::Point, 4*n_points);
817 for (unsigned i = 0; i < pc->ps.size(); i++) {
818 points[i] = pc->ps[i];
819 }
821 // worst case gives us a segment per point
822 int max_segs = 4*n_points;
824 int const n_segs = Geom::bezier_fit_cubic_r(b, points, n_points,
825 tolerance_sq, max_segs);
827 if ( n_segs > 0)
828 {
829 Geom::Path fit(b[0]);
830 for (int c = 0; c < n_segs; c++) {
831 fit.appendNew<Geom::CubicBezier>(b[4*c+1], b[4*c+2], b[4*c+3]);
832 }
833 Geom::Piecewise<Geom::D2<Geom::SBasis> > fit_pwd2 = fit.toPwSb();
835 double t =0.;
836 if ( pc->sketch_n > 0 ) {
837 if (average_all_sketches) {
838 // Average = (sum of all) / n
839 // = (sum of all + new one) / n+1
840 // = ((old average)*n + new one) / n+1
841 t = pc->sketch_n / (pc->sketch_n + 1.);
842 } else {
843 t = 0.5;
844 }
845 pc->sketch_interpolation = Geom::lerp(t, fit_pwd2, pc->sketch_interpolation);
846 // simplify path, to eliminate small segments
847 Path *path = new Path;
848 path->LoadPathVector(Geom::path_from_piecewise(pc->sketch_interpolation, 0.01));
849 path->Simplify(0.5);
850 Geom::PathVector *pathv = path->MakePathVector();
851 pc->sketch_interpolation = (*pathv)[0].toPwSb();
852 delete path;
853 delete pathv;
854 } else {
855 pc->sketch_interpolation = fit_pwd2;
856 }
857 pc->sketch_n++;
859 pc->green_curve->reset();
860 pc->green_curve->set_pathvector(Geom::path_from_piecewise(pc->sketch_interpolation, 0.01));
861 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->green_curve);
863 /* Fit and draw and copy last point */
864 g_assert(!pc->green_curve->is_empty());
866 /* Set up direction of next curve. */
867 {
868 Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->green_curve->last_segment());
869 g_assert( last_seg ); // Relevance: validity of (*last_seg)[2]
870 pc->p[0] = last_seg->finalPoint();
871 pc->npoints = 1;
872 Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] );
873 pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) )
874 ? Geom::Point(0, 0)
875 : Geom::unit_vector(req_vec) );
876 }
877 }
878 g_free(b);
879 g_free(points);
880 pc->ps.clear();
881 }
883 static void
884 fit_and_split(SPPencilContext *pc)
885 {
886 g_assert( pc->npoints > 1 );
888 double const tolerance_sq = 0;
890 Geom::Point b[4];
891 g_assert(is_zero(pc->req_tangent)
892 || is_unit_vector(pc->req_tangent));
893 Geom::Point const tHatEnd(0, 0);
894 int const n_segs = Geom::bezier_fit_cubic_full(b, NULL, pc->p, pc->npoints,
895 pc->req_tangent, tHatEnd,
896 tolerance_sq, 1);
897 if ( n_segs > 0
898 && unsigned(pc->npoints) < G_N_ELEMENTS(pc->p) )
899 {
900 /* Fit and draw and reset state */
901 pc->red_curve->reset();
902 pc->red_curve->moveto(b[0]);
903 pc->red_curve->curveto(b[1], b[2], b[3]);
904 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
905 pc->red_curve_is_valid = true;
906 } else {
907 /* Fit and draw and copy last point */
909 g_assert(!pc->red_curve->is_empty());
911 /* Set up direction of next curve. */
912 {
913 Geom::CubicBezier const * last_seg = dynamic_cast<Geom::CubicBezier const *>(pc->red_curve->last_segment());
914 g_assert( last_seg ); // Relevance: validity of (*last_seg)[2]
915 pc->p[0] = last_seg->finalPoint();
916 pc->npoints = 1;
917 Geom::Point const req_vec( pc->p[0] - (*last_seg)[2] );
918 pc->req_tangent = ( ( Geom::is_zero(req_vec) || !in_svg_plane(req_vec) )
919 ? Geom::Point(0, 0)
920 : Geom::unit_vector(req_vec) );
921 }
923 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
924 SPCurve *curve = pc->red_curve->copy();
926 /// \todo fixme:
927 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
928 curve->unref();
929 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
931 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
933 pc->red_curve_is_valid = false;
934 }
935 }
938 /*
939 Local Variables:
940 mode:c++
941 c-file-style:"stroustrup"
942 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
943 indent-tabs-mode:nil
944 fill-column:99
945 End:
946 */
947 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :