1 /** \file
2 * Pen 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>
19 #include <cstring>
20 #include <string>
22 #include "pen-context.h"
23 #include "sp-namedview.h"
24 #include "sp-metrics.h"
25 #include "desktop.h"
26 #include "desktop-handles.h"
27 #include "selection.h"
28 #include "selection-chemistry.h"
29 #include "draw-anchor.h"
30 #include "message-stack.h"
31 #include "message-context.h"
32 #include "preferences.h"
33 #include "sp-path.h"
34 #include "display/curve.h"
35 #include "pixmaps/cursor-pen.xpm"
36 #include "display/canvas-bpath.h"
37 #include "display/sp-ctrlline.h"
38 #include "display/sodipodi-ctrl.h"
39 #include <glibmm/i18n.h>
40 #include "libnr/nr-point-ops.h"
41 #include "helper/units.h"
42 #include "macros.h"
43 #include "context-fns.h"
44 #include "tools-switch.h"
46 static void sp_pen_context_class_init(SPPenContextClass *klass);
47 static void sp_pen_context_init(SPPenContext *pc);
48 static void sp_pen_context_dispose(GObject *object);
50 static void sp_pen_context_setup(SPEventContext *ec);
51 static void sp_pen_context_finish(SPEventContext *ec);
52 static void sp_pen_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
53 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
54 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
56 static void spdc_pen_set_initial_point(SPPenContext *pc, Geom::Point const p);
57 static void spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status = 0);
58 static void spdc_pen_set_ctrl(SPPenContext *pc, Geom::Point const p, guint state);
59 static void spdc_pen_finish_segment(SPPenContext *pc, Geom::Point p, guint state);
61 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
63 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
64 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
65 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
66 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
67 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
68 static void spdc_reset_colors(SPPenContext *pc);
70 static void pen_disable_events(SPPenContext *const pc);
71 static void pen_enable_events(SPPenContext *const pc);
73 static Geom::Point pen_drag_origin_w(0, 0);
74 static bool pen_within_tolerance = false;
76 static SPDrawContextClass *pen_parent_class;
78 static int pen_next_paraxial_direction(const SPPenContext *const pc, Geom::Point const &pt, Geom::Point const &origin, guint state);
79 static void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap);
81 static int pen_last_paraxial_dir = 0; // last used direction in horizontal/vertical mode; 0 = horizontal, 1 = vertical
83 /**
84 * Register SPPenContext with Gdk and return its type.
85 */
86 GType
87 sp_pen_context_get_type(void)
88 {
89 static GType type = 0;
90 if (!type) {
91 GTypeInfo info = {
92 sizeof(SPPenContextClass),
93 NULL, NULL,
94 (GClassInitFunc) sp_pen_context_class_init,
95 NULL, NULL,
96 sizeof(SPPenContext),
97 4,
98 (GInstanceInitFunc) sp_pen_context_init,
99 NULL, /* value_table */
100 };
101 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
102 }
103 return type;
104 }
106 /**
107 * Initialize the SPPenContext vtable.
108 */
109 static void
110 sp_pen_context_class_init(SPPenContextClass *klass)
111 {
112 GObjectClass *object_class;
113 SPEventContextClass *event_context_class;
115 object_class = (GObjectClass *) klass;
116 event_context_class = (SPEventContextClass *) klass;
118 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
120 object_class->dispose = sp_pen_context_dispose;
122 event_context_class->setup = sp_pen_context_setup;
123 event_context_class->finish = sp_pen_context_finish;
124 event_context_class->set = sp_pen_context_set;
125 event_context_class->root_handler = sp_pen_context_root_handler;
126 event_context_class->item_handler = sp_pen_context_item_handler;
127 }
129 /**
130 * Callback to initialize SPPenContext object.
131 */
132 static void
133 sp_pen_context_init(SPPenContext *pc)
134 {
136 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
138 event_context->cursor_shape = cursor_pen_xpm;
139 event_context->hot_x = 4;
140 event_context->hot_y = 4;
142 pc->npoints = 0;
143 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
144 pc->state = SP_PEN_CONTEXT_POINT;
146 pc->c0 = NULL;
147 pc->c1 = NULL;
148 pc->cl0 = NULL;
149 pc->cl1 = NULL;
151 pc->events_disabled = 0;
153 pc->num_clicks = 0;
154 pc->waiting_LPE = NULL;
155 pc->waiting_item = NULL;
156 }
158 /**
159 * Callback to destroy the SPPenContext object's members and itself.
160 */
161 static void
162 sp_pen_context_dispose(GObject *object)
163 {
164 SPPenContext *pc;
166 pc = SP_PEN_CONTEXT(object);
168 if (pc->c0) {
169 gtk_object_destroy(GTK_OBJECT(pc->c0));
170 pc->c0 = NULL;
171 }
172 if (pc->c1) {
173 gtk_object_destroy(GTK_OBJECT(pc->c1));
174 pc->c1 = NULL;
175 }
176 if (pc->cl0) {
177 gtk_object_destroy(GTK_OBJECT(pc->cl0));
178 pc->cl0 = NULL;
179 }
180 if (pc->cl1) {
181 gtk_object_destroy(GTK_OBJECT(pc->cl1));
182 pc->cl1 = NULL;
183 }
185 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
187 if (pc->expecting_clicks_for_LPE > 0) {
188 // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
189 sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
190 }
191 }
193 void
194 sp_pen_context_set_polyline_mode(SPPenContext *const pc) {
195 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
196 guint mode = prefs->getInt("/tools/freehand/pen/freehand-mode", 0);
197 pc->polylines_only = (mode == 2 || mode == 3);
198 pc->polylines_paraxial = (mode == 3);
199 }
201 /**
202 * Callback to initialize SPPenContext object.
203 */
204 static void
205 sp_pen_context_setup(SPEventContext *ec)
206 {
207 SPPenContext *pc;
209 pc = SP_PEN_CONTEXT(ec);
211 if (((SPEventContextClass *) pen_parent_class)->setup) {
212 ((SPEventContextClass *) pen_parent_class)->setup(ec);
213 }
215 /* Pen indicators */
216 pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
217 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
218 pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
219 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
220 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
221 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
222 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
223 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
225 sp_canvas_item_hide(pc->c0);
226 sp_canvas_item_hide(pc->c1);
227 sp_canvas_item_hide(pc->cl0);
228 sp_canvas_item_hide(pc->cl1);
230 sp_event_context_read(ec, "mode");
232 pc->anchor_statusbar = false;
234 sp_pen_context_set_polyline_mode(pc);
236 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
237 if (prefs->getBool("/tools/freehand/pen/selcue")) {
238 ec->enableSelectionCue();
239 }
240 }
242 static void
243 pen_cancel (SPPenContext *const pc)
244 {
245 pc->num_clicks = 0;
246 pc->state = SP_PEN_CONTEXT_STOP;
247 spdc_reset_colors(pc);
248 sp_canvas_item_hide(pc->c0);
249 sp_canvas_item_hide(pc->c1);
250 sp_canvas_item_hide(pc->cl0);
251 sp_canvas_item_hide(pc->cl1);
252 pc->_message_context->clear();
253 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
255 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
256 }
258 /**
259 * Finalization callback.
260 */
261 static void
262 sp_pen_context_finish(SPEventContext *ec)
263 {
264 SPPenContext *pc = SP_PEN_CONTEXT(ec);
266 sp_event_context_discard_delayed_snap_event(ec);
268 if (pc->npoints != 0) {
269 pen_cancel (pc);
270 }
272 if (((SPEventContextClass *) pen_parent_class)->finish) {
273 ((SPEventContextClass *) pen_parent_class)->finish(ec);
274 }
275 }
277 /**
278 * Callback that sets key to value in pen context.
279 */
280 static void
281 sp_pen_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
282 {
283 SPPenContext *pc = SP_PEN_CONTEXT(ec);
284 Glib::ustring name = val->getEntryName();
286 if (name == "mode") {
287 if ( val->getString() == "drag" ) {
288 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
289 } else {
290 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
291 }
292 }
293 }
295 /**
296 * Snaps new node relative to the previous node.
297 */
298 static void
299 spdc_endpoint_snap(SPPenContext const *const pc, Geom::Point &p, guint const state)
300 {
301 if ((state & GDK_CONTROL_MASK) && !pc->polylines_paraxial) { //CTRL enables angular snapping
302 if (pc->npoints > 0) {
303 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
304 }
305 } else {
306 // We cannot use shift here to disable snapping because the shift-key is already used
307 // to toggle the paraxial direction; if the user wants to disable snapping (s)he will
308 // have to use the %-key, the menu, or the snap toolbar
309 if ((pc->npoints > 0) && pc->polylines_paraxial) {
310 // snap constrained
311 pen_set_to_nearest_horiz_vert(pc, p, state, true);
312 } else {
313 // snap freely
314 spdc_endpoint_snap_free(pc, p, state);
315 }
316 }
317 }
319 /**
320 * Snaps new node's handle relative to the new node.
321 */
322 static void
323 spdc_endpoint_snap_handle(SPPenContext const *const pc, Geom::Point &p, guint const state)
324 {
325 g_return_if_fail(( pc->npoints == 2 ||
326 pc->npoints == 5 ));
328 if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
329 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
330 } else {
331 if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
332 spdc_endpoint_snap_free(pc, p, state);
333 }
334 }
335 }
337 static gint
338 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
339 {
340 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
342 gint ret = FALSE;
344 switch (event->type) {
345 case GDK_BUTTON_PRESS:
346 ret = pen_handle_button_press(pc, event->button);
347 break;
348 case GDK_BUTTON_RELEASE:
349 ret = pen_handle_button_release(pc, event->button);
350 break;
351 default:
352 break;
353 }
355 if (!ret) {
356 if (((SPEventContextClass *) pen_parent_class)->item_handler)
357 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
358 }
360 return ret;
361 }
363 /**
364 * Callback to handle all pen events.
365 */
366 static gint
367 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
368 {
369 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
371 gint ret = FALSE;
373 switch (event->type) {
374 case GDK_BUTTON_PRESS:
375 ret = pen_handle_button_press(pc, event->button);
376 break;
378 case GDK_MOTION_NOTIFY:
379 ret = pen_handle_motion_notify(pc, event->motion);
380 break;
382 case GDK_BUTTON_RELEASE:
383 ret = pen_handle_button_release(pc, event->button);
384 break;
386 case GDK_2BUTTON_PRESS:
387 ret = pen_handle_2button_press(pc, event->button);
388 break;
390 case GDK_KEY_PRESS:
391 ret = pen_handle_key_press(pc, event);
392 break;
394 default:
395 break;
396 }
398 if (!ret) {
399 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
400 = ((SPEventContextClass *) pen_parent_class)->root_handler;
401 if (parent_root_handler) {
402 ret = parent_root_handler(ec, event);
403 }
404 }
406 return ret;
407 }
409 /**
410 * Handle mouse button press event.
411 */
412 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
413 {
414 if (pc->events_disabled) {
415 // skip event processing if events are disabled
416 return FALSE;
417 }
419 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
420 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
421 Geom::Point const event_w(bevent.x, bevent.y);
422 Geom::Point event_dt(desktop->w2d(event_w));
423 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
425 gint ret = FALSE;
426 if (bevent.button == 1 && !event_context->space_panning
427 // make sure this is not the last click for a waiting LPE (otherwise we want to finish the path)
428 && pc->expecting_clicks_for_LPE != 1) {
430 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
431 return TRUE;
432 }
434 if (!pc->grab ) {
435 /* Grab mouse, so release will not pass unnoticed */
436 pc->grab = SP_CANVAS_ITEM(desktop->acetate);
437 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
438 GDK_BUTTON_RELEASE_MASK |
439 GDK_POINTER_MOTION_MASK ),
440 NULL, bevent.time);
441 }
443 pen_drag_origin_w = event_w;
444 pen_within_tolerance = true;
446 /* Test whether we hit any anchor. */
447 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
449 switch (pc->mode) {
450 case SP_PEN_CONTEXT_MODE_CLICK:
451 /* In click mode we add point on release */
452 switch (pc->state) {
453 case SP_PEN_CONTEXT_POINT:
454 case SP_PEN_CONTEXT_CONTROL:
455 case SP_PEN_CONTEXT_CLOSE:
456 break;
457 case SP_PEN_CONTEXT_STOP:
458 /* This is allowed, if we just canceled curve */
459 pc->state = SP_PEN_CONTEXT_POINT;
460 break;
461 default:
462 break;
463 }
464 break;
465 case SP_PEN_CONTEXT_MODE_DRAG:
466 switch (pc->state) {
467 case SP_PEN_CONTEXT_STOP:
468 /* This is allowed, if we just canceled curve */
469 case SP_PEN_CONTEXT_POINT:
470 if (pc->npoints == 0) {
472 Geom::Point p;
473 if ((bevent.state & GDK_CONTROL_MASK) && (pc->polylines_only || pc->polylines_paraxial)) {
474 p = event_dt;
475 if (!(bevent.state & GDK_SHIFT_MASK)) {
476 SnapManager &m = desktop->namedview->snap_manager;
477 m.setup(desktop);
478 m.freeSnapReturnByRef(p, Inkscape::SNAPSOURCE_NODE_HANDLE);
479 m.unSetup();
480 }
481 spdc_create_single_dot(event_context, p, "/tools/freehand/pen", bevent.state);
482 ret = TRUE;
483 break;
484 }
486 // TODO: Perhaps it would be nicer to rearrange the following case
487 // distinction so that the case of a waiting LPE is treated separately
489 /* Set start anchor */
490 pc->sa = anchor;
491 if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
492 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
493 a fresh path to be created so don't continue an existing one */
494 p = anchor->dp;
495 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
496 } else {
497 // This is the first click of a new curve; deselect item so that
498 // this curve is not combined with it (unless it is drawn from its
499 // anchor, which is handled by the sibling branch above)
500 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
501 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
502 /* if we have a waiting LPE, we need a fresh path to be created
503 so don't append to an existing one */
504 selection->clear();
505 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
506 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
507 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
508 }
510 /* Create green anchor */
511 p = event_dt;
512 spdc_endpoint_snap(pc, p, bevent.state);
513 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
514 }
515 spdc_pen_set_initial_point(pc, p);
516 } else {
518 /* Set end anchor */
519 pc->ea = anchor;
520 Geom::Point p;
521 if (anchor) {
522 p = anchor->dp;
523 // we hit an anchor, will finish the curve (either with or without closing)
524 // in release handler
525 pc->state = SP_PEN_CONTEXT_CLOSE;
527 if (pc->green_anchor && pc->green_anchor->active) {
528 // we clicked on the current curve start, so close it even if
529 // we drag a handle away from it
530 dc->green_closed = TRUE;
531 }
532 ret = TRUE;
533 break;
535 } else {
536 p = event_dt;
537 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
538 spdc_pen_set_subsequent_point(pc, p, true);
539 }
540 }
542 pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
543 ret = TRUE;
544 break;
545 case SP_PEN_CONTEXT_CONTROL:
546 g_warning("Button down in CONTROL state");
547 break;
548 case SP_PEN_CONTEXT_CLOSE:
549 g_warning("Button down in CLOSE state");
550 break;
551 default:
552 break;
553 }
554 break;
555 default:
556 break;
557 }
558 } else if (pc->expecting_clicks_for_LPE == 1 && pc->npoints != 0) {
559 // when the last click for a waiting LPE occurs we want to finish the path
560 spdc_pen_finish_segment(pc, event_dt, bevent.state);
561 if (pc->green_closed) {
562 // finishing at the start anchor, close curve
563 spdc_pen_finish(pc, TRUE);
564 } else {
565 // finishing at some other anchor, finish curve but not close
566 spdc_pen_finish(pc, FALSE);
567 }
569 ret = TRUE;
570 } else if (bevent.button == 3 && pc->npoints != 0) {
571 // right click - finish path
572 spdc_pen_finish(pc, FALSE);
573 ret = TRUE;
574 }
576 if (pc->expecting_clicks_for_LPE > 0) {
577 --pc->expecting_clicks_for_LPE;
578 }
580 return ret;
581 }
583 /**
584 * Handle motion_notify event.
585 */
586 static gint
587 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
588 {
589 gint ret = FALSE;
591 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
592 SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
594 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
595 // allow scrolling
596 return FALSE;
597 }
599 if (pc->events_disabled) {
600 // skip motion events if pen events are disabled
601 return FALSE;
602 }
604 Geom::Point const event_w(mevent.x,
605 mevent.y);
606 if (pen_within_tolerance) {
607 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
608 gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
609 if ( Geom::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
610 return FALSE; // Do not drag if we're within tolerance from origin.
611 }
612 }
613 // Once the user has moved farther than tolerance from the original location
614 // (indicating they intend to move the object, not click), then always process the
615 // motion notify coordinates as given (no snapping back to origin)
616 pen_within_tolerance = false;
618 /* Find desktop coordinates */
619 Geom::Point p = dt->w2d(event_w);
621 /* Test, whether we hit any anchor */
622 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
624 switch (pc->mode) {
625 case SP_PEN_CONTEXT_MODE_CLICK:
626 switch (pc->state) {
627 case SP_PEN_CONTEXT_POINT:
628 if ( pc->npoints != 0 ) {
629 /* Only set point, if we are already appending */
630 spdc_endpoint_snap(pc, p, mevent.state);
631 spdc_pen_set_subsequent_point(pc, p, true);
632 ret = TRUE;
633 } else if (!sp_event_context_knot_mouseover(pc)) {
634 SnapManager &m = dt->namedview->snap_manager;
635 m.setup(dt);
636 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
637 m.unSetup();
638 }
639 break;
640 case SP_PEN_CONTEXT_CONTROL:
641 case SP_PEN_CONTEXT_CLOSE:
642 /* Placing controls is last operation in CLOSE state */
643 spdc_endpoint_snap(pc, p, mevent.state);
644 spdc_pen_set_ctrl(pc, p, mevent.state);
645 ret = TRUE;
646 break;
647 case SP_PEN_CONTEXT_STOP:
648 /* This is perfectly valid */
649 break;
650 default:
651 break;
652 }
653 break;
654 case SP_PEN_CONTEXT_MODE_DRAG:
655 switch (pc->state) {
656 case SP_PEN_CONTEXT_POINT:
657 if ( pc->npoints > 0 ) {
658 /* Only set point, if we are already appending */
660 if (!anchor) { /* Snap node only if not hitting anchor */
661 spdc_endpoint_snap(pc, p, mevent.state);
662 spdc_pen_set_subsequent_point(pc, p, true, mevent.state);
663 } else {
664 spdc_pen_set_subsequent_point(pc, anchor->dp, false, mevent.state);
665 }
667 if (anchor && !pc->anchor_statusbar) {
668 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
669 pc->anchor_statusbar = true;
670 } else if (!anchor && pc->anchor_statusbar) {
671 pc->_message_context->clear();
672 pc->anchor_statusbar = false;
673 }
675 ret = TRUE;
676 } else {
677 if (anchor && !pc->anchor_statusbar) {
678 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
679 pc->anchor_statusbar = true;
680 } else if (!anchor && pc->anchor_statusbar) {
681 pc->_message_context->clear();
682 pc->anchor_statusbar = false;
683 }
684 if (!sp_event_context_knot_mouseover(pc)) {
685 SnapManager &m = dt->namedview->snap_manager;
686 m.setup(dt);
687 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
688 m.unSetup();
689 }
690 }
691 break;
692 case SP_PEN_CONTEXT_CONTROL:
693 case SP_PEN_CONTEXT_CLOSE:
694 /* Placing controls is last operation in CLOSE state */
696 // snap the handle
697 spdc_endpoint_snap_handle(pc, p, mevent.state);
699 if (!pc->polylines_only) {
700 spdc_pen_set_ctrl(pc, p, mevent.state);
701 } else {
702 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
703 }
704 gobble_motion_events(GDK_BUTTON1_MASK);
705 ret = TRUE;
706 break;
707 case SP_PEN_CONTEXT_STOP:
708 /* This is perfectly valid */
709 break;
710 default:
711 if (!sp_event_context_knot_mouseover(pc)) {
712 SnapManager &m = dt->namedview->snap_manager;
713 m.setup(dt);
714 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
715 m.unSetup();
716 }
717 break;
718 }
719 break;
720 default:
721 break;
722 }
723 return ret;
724 }
726 /**
727 * Handle mouse button release event.
728 */
729 static gint
730 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
731 {
732 if (pc->events_disabled) {
733 // skip event processing if events are disabled
734 return FALSE;
735 }
737 gint ret = FALSE;
738 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
739 if ( revent.button == 1 && !event_context->space_panning) {
741 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
743 Geom::Point const event_w(revent.x,
744 revent.y);
745 /* Find desktop coordinates */
746 Geom::Point p = pc->desktop->w2d(event_w);
748 /* Test whether we hit any anchor. */
749 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
751 switch (pc->mode) {
752 case SP_PEN_CONTEXT_MODE_CLICK:
753 switch (pc->state) {
754 case SP_PEN_CONTEXT_POINT:
755 if ( pc->npoints == 0 ) {
756 /* Start new thread only with button release */
757 if (anchor) {
758 p = anchor->dp;
759 }
760 pc->sa = anchor;
761 spdc_pen_set_initial_point(pc, p);
762 } else {
763 /* Set end anchor here */
764 pc->ea = anchor;
765 if (anchor) {
766 p = anchor->dp;
767 }
768 }
769 pc->state = SP_PEN_CONTEXT_CONTROL;
770 ret = TRUE;
771 break;
772 case SP_PEN_CONTEXT_CONTROL:
773 /* End current segment */
774 spdc_endpoint_snap(pc, p, revent.state);
775 spdc_pen_finish_segment(pc, p, revent.state);
776 pc->state = SP_PEN_CONTEXT_POINT;
777 ret = TRUE;
778 break;
779 case SP_PEN_CONTEXT_CLOSE:
780 /* End current segment */
781 if (!anchor) { /* Snap node only if not hitting anchor */
782 spdc_endpoint_snap(pc, p, revent.state);
783 }
784 spdc_pen_finish_segment(pc, p, revent.state);
785 spdc_pen_finish(pc, TRUE);
786 pc->state = SP_PEN_CONTEXT_POINT;
787 ret = TRUE;
788 break;
789 case SP_PEN_CONTEXT_STOP:
790 /* This is allowed, if we just canceled curve */
791 pc->state = SP_PEN_CONTEXT_POINT;
792 ret = TRUE;
793 break;
794 default:
795 break;
796 }
797 break;
798 case SP_PEN_CONTEXT_MODE_DRAG:
799 switch (pc->state) {
800 case SP_PEN_CONTEXT_POINT:
801 case SP_PEN_CONTEXT_CONTROL:
802 spdc_endpoint_snap(pc, p, revent.state);
803 spdc_pen_finish_segment(pc, p, revent.state);
804 break;
805 case SP_PEN_CONTEXT_CLOSE:
806 spdc_endpoint_snap(pc, p, revent.state);
807 spdc_pen_finish_segment(pc, p, revent.state);
808 if (pc->green_closed) {
809 // finishing at the start anchor, close curve
810 spdc_pen_finish(pc, TRUE);
811 } else {
812 // finishing at some other anchor, finish curve but not close
813 spdc_pen_finish(pc, FALSE);
814 }
815 break;
816 case SP_PEN_CONTEXT_STOP:
817 /* This is allowed, if we just cancelled curve */
818 break;
819 default:
820 break;
821 }
822 pc->state = SP_PEN_CONTEXT_POINT;
823 ret = TRUE;
824 break;
825 default:
826 break;
827 }
829 if (pc->grab) {
830 /* Release grab now */
831 sp_canvas_item_ungrab(pc->grab, revent.time);
832 pc->grab = NULL;
833 }
835 ret = TRUE;
837 dc->green_closed = FALSE;
838 }
840 // TODO: can we be sure that the path was created correctly?
841 // TODO: should we offer an option to collect the clicks in a list?
842 if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
843 sp_pen_context_set_polyline_mode(pc);
845 SPEventContext *ec = SP_EVENT_CONTEXT(pc);
846 Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
848 if (pc->waiting_LPE) {
849 // we have an already created LPE waiting for a path
850 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
851 selection->add(SP_OBJECT(pc->waiting_item));
852 pc->waiting_LPE = NULL;
853 } else {
854 // the case that we need to create a new LPE and apply it to the just-drawn path is
855 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
856 }
857 }
859 return ret;
860 }
862 static gint
863 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
864 {
865 gint ret = FALSE;
866 // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
867 if (pc->npoints != 0 && bevent.button == 1) {
868 spdc_pen_finish(pc, FALSE);
869 ret = TRUE;
870 }
871 return ret;
872 }
874 void
875 pen_redraw_all (SPPenContext *const pc)
876 {
877 // green
878 if (pc->green_bpaths) {
879 // remove old piecewise green canvasitems
880 while (pc->green_bpaths) {
881 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
882 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
883 }
884 // one canvas bpath for all of green_curve
885 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
886 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
887 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
889 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
890 }
892 if (pc->green_anchor)
893 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
895 pc->red_curve->reset();
896 pc->red_curve->moveto(pc->p[0]);
897 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
898 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
900 // handles
901 if (pc->p[0] != pc->p[1]) {
902 SP_CTRL(pc->c1)->moveto(pc->p[1]);
903 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
904 sp_canvas_item_show (pc->c1);
905 sp_canvas_item_show (pc->cl1);
906 } else {
907 sp_canvas_item_hide (pc->c1);
908 sp_canvas_item_hide (pc->cl1);
909 }
911 Geom::Curve const * last_seg = pc->green_curve->last_segment();
912 if (last_seg) {
913 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
914 if ( cubic &&
915 (*cubic)[2] != to_2geom(pc->p[0]) )
916 {
917 Geom::Point p2 = (*cubic)[2];
918 SP_CTRL(pc->c0)->moveto(p2);
919 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
920 sp_canvas_item_show (pc->c0);
921 sp_canvas_item_show (pc->cl0);
922 } else {
923 sp_canvas_item_hide (pc->c0);
924 sp_canvas_item_hide (pc->cl0);
925 }
926 }
927 }
929 void
930 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
931 {
932 if (pc->npoints != 5)
933 return;
935 // green
936 if (!pc->green_curve->is_empty()) {
937 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
938 } else {
939 // start anchor too
940 if (pc->green_anchor) {
941 pc->green_anchor->dp += Geom::Point(x, y);
942 }
943 }
945 // red
946 pc->p[0] += Geom::Point(x, y);
947 pc->p[1] += Geom::Point(x, y);
948 pen_redraw_all(pc);
949 }
951 void
952 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
953 {
954 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
955 }
957 void
958 pen_lastpoint_tocurve (SPPenContext *const pc)
959 {
960 if (pc->npoints != 5)
961 return;
963 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
964 if ( cubic ) {
965 pc->p[1] = pc->p[0] + (Geom::Point)( (*cubic)[3] - (*cubic)[2] );
966 } else {
967 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
968 }
970 pen_redraw_all(pc);
971 }
973 void
974 pen_lastpoint_toline (SPPenContext *const pc)
975 {
976 if (pc->npoints != 5)
977 return;
979 pc->p[1] = pc->p[0];
981 pen_redraw_all(pc);
982 }
985 static gint
986 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
987 {
989 gint ret = FALSE;
990 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
991 gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
993 switch (get_group0_keyval (&event->key)) {
995 case GDK_Left: // move last point left
996 case GDK_KP_Left:
997 case GDK_KP_4:
998 if (!MOD__CTRL) { // not ctrl
999 if (MOD__ALT) { // alt
1000 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
1001 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
1002 }
1003 else { // no alt
1004 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
1005 else pen_lastpoint_move(pc, -nudge, 0); // no shift
1006 }
1007 ret = TRUE;
1008 }
1009 break;
1010 case GDK_Up: // move last point up
1011 case GDK_KP_Up:
1012 case GDK_KP_8:
1013 if (!MOD__CTRL) { // not ctrl
1014 if (MOD__ALT) { // alt
1015 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
1016 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
1017 }
1018 else { // no alt
1019 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
1020 else pen_lastpoint_move(pc, 0, nudge); // no shift
1021 }
1022 ret = TRUE;
1023 }
1024 break;
1025 case GDK_Right: // move last point right
1026 case GDK_KP_Right:
1027 case GDK_KP_6:
1028 if (!MOD__CTRL) { // not ctrl
1029 if (MOD__ALT) { // alt
1030 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
1031 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
1032 }
1033 else { // no alt
1034 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
1035 else pen_lastpoint_move(pc, nudge, 0); // no shift
1036 }
1037 ret = TRUE;
1038 }
1039 break;
1040 case GDK_Down: // move last point down
1041 case GDK_KP_Down:
1042 case GDK_KP_2:
1043 if (!MOD__CTRL) { // not ctrl
1044 if (MOD__ALT) { // alt
1045 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
1046 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
1047 }
1048 else { // no alt
1049 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
1050 else pen_lastpoint_move(pc, 0, -nudge); // no shift
1051 }
1052 ret = TRUE;
1053 }
1054 break;
1056 /* TODO: this is not yet enabled?? looks like some traces of the Geometry tool
1057 case GDK_P:
1058 case GDK_p:
1059 if (MOD__SHIFT_ONLY) {
1060 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1061 ret = TRUE;
1062 }
1063 break;
1065 case GDK_C:
1066 case GDK_c:
1067 if (MOD__SHIFT_ONLY) {
1068 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1069 ret = TRUE;
1070 }
1071 break;
1073 case GDK_B:
1074 case GDK_b:
1075 if (MOD__SHIFT_ONLY) {
1076 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1077 ret = TRUE;
1078 }
1079 break;
1081 case GDK_A:
1082 case GDK_a:
1083 if (MOD__SHIFT_ONLY) {
1084 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1085 ret = TRUE;
1086 }
1087 break;
1088 */
1090 case GDK_U:
1091 case GDK_u:
1092 if (MOD__SHIFT_ONLY) {
1093 pen_lastpoint_tocurve(pc);
1094 ret = TRUE;
1095 }
1096 break;
1097 case GDK_L:
1098 case GDK_l:
1099 if (MOD__SHIFT_ONLY) {
1100 pen_lastpoint_toline(pc);
1101 ret = TRUE;
1102 }
1103 break;
1105 case GDK_Return:
1106 case GDK_KP_Enter:
1107 if (pc->npoints != 0) {
1108 spdc_pen_finish(pc, FALSE);
1109 ret = TRUE;
1110 }
1111 break;
1112 case GDK_Escape:
1113 if (pc->npoints != 0) {
1114 // if drawing, cancel, otherwise pass it up for deselecting
1115 pen_cancel (pc);
1116 ret = TRUE;
1117 }
1118 break;
1119 case GDK_z:
1120 case GDK_Z:
1121 if (MOD__CTRL_ONLY && pc->npoints != 0) {
1122 // if drawing, cancel, otherwise pass it up for undo
1123 pen_cancel (pc);
1124 ret = TRUE;
1125 }
1126 break;
1127 case GDK_g:
1128 case GDK_G:
1129 if (MOD__SHIFT_ONLY) {
1130 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
1131 ret = true;
1132 }
1133 break;
1134 case GDK_BackSpace:
1135 case GDK_Delete:
1136 case GDK_KP_Delete:
1137 if ( pc->green_curve->is_empty() || (pc->green_curve->last_segment() == NULL) ) {
1138 if (!pc->red_curve->is_empty()) {
1139 pen_cancel (pc);
1140 ret = TRUE;
1141 } else {
1142 // do nothing; this event should be handled upstream
1143 }
1144 } else {
1145 /* Reset red curve */
1146 pc->red_curve->reset();
1147 /* Destroy topmost green bpath */
1148 if (pc->green_bpaths) {
1149 if (pc->green_bpaths->data)
1150 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1151 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1152 }
1153 /* Get last segment */
1154 if ( pc->green_curve->is_empty() ) {
1155 g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1156 break;
1157 }
1158 // The code below assumes that pc->green_curve has only ONE path !
1159 Geom::Curve const * crv = pc->green_curve->last_segment();
1160 pc->p[0] = crv->initialPoint();
1161 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1162 pc->p[1] = (*cubic)[1];
1163 } else {
1164 pc->p[1] = pc->p[0];
1165 }
1166 Geom::Point const pt(( pc->npoints < 4
1167 ? (Geom::Point)(crv->finalPoint())
1168 : pc->p[3] ));
1169 pc->npoints = 2;
1170 pc->green_curve->backspace();
1171 sp_canvas_item_hide(pc->c0);
1172 sp_canvas_item_hide(pc->c1);
1173 sp_canvas_item_hide(pc->cl0);
1174 sp_canvas_item_hide(pc->cl1);
1175 pc->state = SP_PEN_CONTEXT_POINT;
1176 spdc_pen_set_subsequent_point(pc, pt, true);
1177 pen_last_paraxial_dir = !pen_last_paraxial_dir;
1178 ret = TRUE;
1179 }
1180 break;
1181 default:
1182 break;
1183 }
1184 return ret;
1185 }
1187 static void
1188 spdc_reset_colors(SPPenContext *pc)
1189 {
1190 /* Red */
1191 pc->red_curve->reset();
1192 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1193 /* Blue */
1194 pc->blue_curve->reset();
1195 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1196 /* Green */
1197 while (pc->green_bpaths) {
1198 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1199 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1200 }
1201 pc->green_curve->reset();
1202 if (pc->green_anchor) {
1203 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1204 }
1205 pc->sa = NULL;
1206 pc->ea = NULL;
1207 pc->npoints = 0;
1208 pc->red_curve_is_valid = false;
1209 }
1212 static void
1213 spdc_pen_set_initial_point(SPPenContext *const pc, Geom::Point const p)
1214 {
1215 g_assert( pc->npoints == 0 );
1217 pc->p[0] = p;
1218 pc->p[1] = p;
1219 pc->npoints = 2;
1220 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1222 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1223 }
1225 /**
1226 * Show the status message for the current line/curve segment.
1227 * This type of message always shows angle/distance as the last
1228 * two parameters ("angle %3.2f°, distance %s").
1229 */
1230 static void
1231 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, Geom::Point const p, int pc_point_to_compare, gchar const *message)
1232 {
1233 g_assert(pc != NULL);
1234 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1235 g_assert(message != NULL);
1237 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1238 Geom::Point rel = p - pc->p[pc_point_to_compare];
1239 GString *dist = SP_PX_TO_METRIC_STRING(Geom::L2(rel), desktop->namedview->getDefaultMetric());
1240 double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
1241 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1242 if (prefs->getBool("/options/compassangledisplay/value", 0) != 0)
1243 angle = angle_to_compass (angle);
1245 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1246 g_string_free(dist, FALSE);
1247 }
1249 static void
1250 spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status)
1251 {
1252 g_assert( pc->npoints != 0 );
1253 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1255 pc->p[2] = p;
1256 pc->p[3] = p;
1257 pc->p[4] = p;
1258 pc->npoints = 5;
1259 pc->red_curve->reset();
1260 bool is_curve;
1261 pc->red_curve->moveto(pc->p[0]);
1262 if (pc->polylines_paraxial && !statusbar) {
1263 // we are drawing horizontal/vertical lines and hit an anchor;
1264 Geom::Point const origin = pc->p[0];
1265 // if the previous point and the anchor are not aligned either horizontally or vertically...
1266 if ((abs(p[Geom::X] - origin[Geom::X]) > 1e-9) && (abs(p[Geom::Y] - origin[Geom::Y]) > 1e-9)) {
1267 // ...then we should draw an L-shaped path, consisting of two paraxial segments
1268 Geom::Point intermed = p;
1269 pen_set_to_nearest_horiz_vert(pc, intermed, status, false);
1270 pc->red_curve->lineto(intermed);
1271 }
1272 pc->red_curve->lineto(p);
1273 is_curve = false;
1274 } else {
1275 // one of the 'regular' modes
1276 if (pc->p[1] != pc->p[0]) {
1277 pc->red_curve->curveto(pc->p[1], p, p);
1278 is_curve = true;
1279 } else {
1280 pc->red_curve->lineto(p);
1281 is_curve = false;
1282 }
1283 }
1285 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1287 if (statusbar) {
1288 gchar *message = is_curve ?
1289 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1290 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1291 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1292 }
1293 }
1295 static void
1296 spdc_pen_set_ctrl(SPPenContext *const pc, Geom::Point const p, guint const state)
1297 {
1298 sp_canvas_item_show(pc->c1);
1299 sp_canvas_item_show(pc->cl1);
1301 if ( pc->npoints == 2 ) {
1302 pc->p[1] = p;
1303 sp_canvas_item_hide(pc->c0);
1304 sp_canvas_item_hide(pc->cl0);
1305 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1306 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1308 spdc_pen_set_angle_distance_status_message(pc, p, 0, _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle"));
1309 } else if ( pc->npoints == 5 ) {
1310 pc->p[4] = p;
1311 sp_canvas_item_show(pc->c0);
1312 sp_canvas_item_show(pc->cl0);
1313 bool is_symm = false;
1314 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1315 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1316 Geom::Point delta = p - pc->p[3];
1317 pc->p[2] = pc->p[3] - delta;
1318 is_symm = true;
1319 pc->red_curve->reset();
1320 pc->red_curve->moveto(pc->p[0]);
1321 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1322 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1323 }
1324 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1325 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1326 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1327 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1329 gchar *message = is_symm ?
1330 _("<b>Curve handle, symmetric</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only") :
1331 _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only");
1332 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1333 } else {
1334 g_warning("Something bad happened - npoints is %d", pc->npoints);
1335 }
1336 }
1338 static void
1339 spdc_pen_finish_segment(SPPenContext *const pc, Geom::Point const p, guint const state)
1340 {
1341 if (pc->polylines_paraxial) {
1342 pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
1343 }
1345 ++pc->num_clicks;
1347 if (!pc->red_curve->is_empty()) {
1348 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1349 SPCurve *curve = pc->red_curve->copy();
1350 /// \todo fixme:
1351 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1352 curve->unref();
1353 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1355 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1357 pc->p[0] = pc->p[3];
1358 pc->p[1] = pc->p[4];
1359 pc->npoints = 2;
1361 pc->red_curve->reset();
1362 }
1363 }
1365 static void
1366 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1367 {
1368 if (pc->expecting_clicks_for_LPE > 1) {
1369 // don't let the path be finished before we have collected the required number of mouse clicks
1370 return;
1371 }
1373 pc->num_clicks = 0;
1375 pen_disable_events(pc);
1377 SPDesktop *const desktop = pc->desktop;
1378 pc->_message_context->clear();
1379 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1381 pc->red_curve->reset();
1382 spdc_concat_colors_and_flush(pc, closed);
1383 pc->sa = NULL;
1384 pc->ea = NULL;
1386 pc->npoints = 0;
1387 pc->state = SP_PEN_CONTEXT_POINT;
1389 sp_canvas_item_hide(pc->c0);
1390 sp_canvas_item_hide(pc->c1);
1391 sp_canvas_item_hide(pc->cl0);
1392 sp_canvas_item_hide(pc->cl1);
1394 if (pc->green_anchor) {
1395 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1396 }
1399 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1401 pen_enable_events(pc);
1402 }
1404 static void
1405 pen_disable_events(SPPenContext *const pc) {
1406 pc->events_disabled++;
1407 }
1409 static void
1410 pen_enable_events(SPPenContext *const pc) {
1411 g_return_if_fail(pc->events_disabled != 0);
1413 pc->events_disabled--;
1414 }
1416 void
1417 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1418 unsigned int num_clicks, bool use_polylines)
1419 {
1420 if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
1421 return;
1423 pc->waiting_LPE_type = effect_type;
1424 pc->expecting_clicks_for_LPE = num_clicks;
1425 pc->polylines_only = use_polylines;
1426 pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
1427 }
1429 void
1430 sp_pen_context_cancel_waiting_for_LPE(SPPenContext *pc)
1431 {
1432 pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
1433 pc->expecting_clicks_for_LPE = 0;
1434 sp_pen_context_set_polyline_mode(pc);
1435 }
1437 static int pen_next_paraxial_direction(const SPPenContext *const pc,
1438 Geom::Point const &pt, Geom::Point const &origin, guint state) {
1439 /*
1440 * after the first mouse click we determine whether the mouse pointer is closest to a
1441 * horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
1442 * orthogonal to the last one; pressing Shift toggles the direction
1443 */
1444 // num_clicks is not reliable because spdc_pen_finish_segment is sometimes called too early
1445 // (on first mouse release), in which case num_clicks immediately becomes 1.
1446 // if (pc->num_clicks == 0) {
1448 if (pc->green_curve->is_empty()) {
1449 // first mouse click
1450 double dist_h = fabs(pt[Geom::X] - origin[Geom::X]);
1451 double dist_v = fabs(pt[Geom::Y] - origin[Geom::Y]);
1452 int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
1453 pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
1454 return pen_last_paraxial_dir;
1455 } else {
1456 // subsequent mouse click
1457 return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
1458 }
1459 }
1461 void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap)
1462 {
1463 Geom::Point const origin = pc->p[0];
1465 int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
1467 if (!snap) {
1468 if (next_dir == 0) {
1469 // line is forced to be horizontal
1470 pt[Geom::Y] = origin[Geom::Y];
1471 } else {
1472 // line is forced to be vertical
1473 pt[Geom::X] = origin[Geom::X];
1474 }
1475 } else {
1476 // Create a horizontal or vertical constraint line
1477 Inkscape::Snapper::SnapConstraint cl(origin, next_dir ? Geom::Point(0, 1) : Geom::Point(1, 0));
1479 // Snap along the constraint line; if we didn't snap then still the constraint will be applied
1480 SnapManager &m = pc->desktop->namedview->snap_manager;
1482 Inkscape::Selection *selection = sp_desktop_selection (pc->desktop);
1483 // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
1484 // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
1486 m.setup(pc->desktop, true, selection->singleItem());
1487 m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
1488 m.unSetup();
1489 }
1490 }
1492 /*
1493 Local Variables:
1494 mode:c++
1495 c-file-style:"stroustrup"
1496 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1497 indent-tabs-mode:nil
1498 fill-column:99
1499 End:
1500 */
1501 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:fileencoding=utf-8:textwidth=99 :