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 }
480 spdc_create_single_dot(event_context, p, "/tools/freehand/pen", bevent.state);
481 ret = TRUE;
482 break;
483 }
485 // TODO: Perhaps it would be nicer to rearrange the following case
486 // distinction so that the case of a waiting LPE is treated separately
488 /* Set start anchor */
489 pc->sa = anchor;
490 if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
491 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
492 a fresh path to be created so don't continue an existing one */
493 p = anchor->dp;
494 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
495 } else {
496 // This is the first click of a new curve; deselect item so that
497 // this curve is not combined with it (unless it is drawn from its
498 // anchor, which is handled by the sibling branch above)
499 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
500 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
501 /* if we have a waiting LPE, we need a fresh path to be created
502 so don't append to an existing one */
503 selection->clear();
504 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
505 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
506 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
507 }
509 /* Create green anchor */
510 p = event_dt;
511 spdc_endpoint_snap(pc, p, bevent.state);
512 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
513 }
514 spdc_pen_set_initial_point(pc, p);
515 } else {
517 /* Set end anchor */
518 pc->ea = anchor;
519 Geom::Point p;
520 if (anchor) {
521 p = anchor->dp;
522 // we hit an anchor, will finish the curve (either with or without closing)
523 // in release handler
524 pc->state = SP_PEN_CONTEXT_CLOSE;
526 if (pc->green_anchor && pc->green_anchor->active) {
527 // we clicked on the current curve start, so close it even if
528 // we drag a handle away from it
529 dc->green_closed = TRUE;
530 }
531 ret = TRUE;
532 break;
534 } else {
535 p = event_dt;
536 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
537 spdc_pen_set_subsequent_point(pc, p, true);
538 }
539 }
541 pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
542 ret = TRUE;
543 break;
544 case SP_PEN_CONTEXT_CONTROL:
545 g_warning("Button down in CONTROL state");
546 break;
547 case SP_PEN_CONTEXT_CLOSE:
548 g_warning("Button down in CLOSE state");
549 break;
550 default:
551 break;
552 }
553 break;
554 default:
555 break;
556 }
557 } else if (pc->expecting_clicks_for_LPE == 1 && pc->npoints != 0) {
558 // when the last click for a waiting LPE occurs we want to finish the path
559 spdc_pen_finish_segment(pc, event_dt, bevent.state);
560 if (pc->green_closed) {
561 // finishing at the start anchor, close curve
562 spdc_pen_finish(pc, TRUE);
563 } else {
564 // finishing at some other anchor, finish curve but not close
565 spdc_pen_finish(pc, FALSE);
566 }
568 ret = TRUE;
569 } else if (bevent.button == 3 && pc->npoints != 0) {
570 // right click - finish path
571 spdc_pen_finish(pc, FALSE);
572 ret = TRUE;
573 }
575 if (pc->expecting_clicks_for_LPE > 0) {
576 --pc->expecting_clicks_for_LPE;
577 }
579 return ret;
580 }
582 /**
583 * Handle motion_notify event.
584 */
585 static gint
586 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
587 {
588 gint ret = FALSE;
590 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
591 SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
593 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
594 // allow scrolling
595 return FALSE;
596 }
598 if (pc->events_disabled) {
599 // skip motion events if pen events are disabled
600 return FALSE;
601 }
603 Geom::Point const event_w(mevent.x,
604 mevent.y);
605 if (pen_within_tolerance) {
606 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
607 gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
608 if ( Geom::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
609 return FALSE; // Do not drag if we're within tolerance from origin.
610 }
611 }
612 // Once the user has moved farther than tolerance from the original location
613 // (indicating they intend to move the object, not click), then always process the
614 // motion notify coordinates as given (no snapping back to origin)
615 pen_within_tolerance = false;
617 /* Find desktop coordinates */
618 Geom::Point p = dt->w2d(event_w);
620 /* Test, whether we hit any anchor */
621 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
623 switch (pc->mode) {
624 case SP_PEN_CONTEXT_MODE_CLICK:
625 switch (pc->state) {
626 case SP_PEN_CONTEXT_POINT:
627 if ( pc->npoints != 0 ) {
628 /* Only set point, if we are already appending */
629 spdc_endpoint_snap(pc, p, mevent.state);
630 spdc_pen_set_subsequent_point(pc, p, true);
631 ret = TRUE;
632 } else if (!sp_event_context_knot_mouseover(pc)) {
633 SnapManager &m = dt->namedview->snap_manager;
634 m.setup(dt);
635 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
636 }
637 break;
638 case SP_PEN_CONTEXT_CONTROL:
639 case SP_PEN_CONTEXT_CLOSE:
640 /* Placing controls is last operation in CLOSE state */
641 spdc_endpoint_snap(pc, p, mevent.state);
642 spdc_pen_set_ctrl(pc, p, mevent.state);
643 ret = TRUE;
644 break;
645 case SP_PEN_CONTEXT_STOP:
646 /* This is perfectly valid */
647 break;
648 default:
649 break;
650 }
651 break;
652 case SP_PEN_CONTEXT_MODE_DRAG:
653 switch (pc->state) {
654 case SP_PEN_CONTEXT_POINT:
655 if ( pc->npoints > 0 ) {
656 /* Only set point, if we are already appending */
658 if (!anchor) { /* Snap node only if not hitting anchor */
659 spdc_endpoint_snap(pc, p, mevent.state);
660 spdc_pen_set_subsequent_point(pc, p, true, mevent.state);
661 } else {
662 spdc_pen_set_subsequent_point(pc, anchor->dp, false, mevent.state);
663 }
665 if (anchor && !pc->anchor_statusbar) {
666 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
667 pc->anchor_statusbar = true;
668 } else if (!anchor && pc->anchor_statusbar) {
669 pc->_message_context->clear();
670 pc->anchor_statusbar = false;
671 }
673 ret = TRUE;
674 } else {
675 if (anchor && !pc->anchor_statusbar) {
676 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
677 pc->anchor_statusbar = true;
678 } else if (!anchor && pc->anchor_statusbar) {
679 pc->_message_context->clear();
680 pc->anchor_statusbar = false;
681 }
682 if (!sp_event_context_knot_mouseover(pc)) {
683 SnapManager &m = dt->namedview->snap_manager;
684 m.setup(dt);
685 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
686 }
687 }
688 break;
689 case SP_PEN_CONTEXT_CONTROL:
690 case SP_PEN_CONTEXT_CLOSE:
691 /* Placing controls is last operation in CLOSE state */
693 // snap the handle
694 spdc_endpoint_snap_handle(pc, p, mevent.state);
696 if (!pc->polylines_only) {
697 spdc_pen_set_ctrl(pc, p, mevent.state);
698 } else {
699 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
700 }
701 gobble_motion_events(GDK_BUTTON1_MASK);
702 ret = TRUE;
703 break;
704 case SP_PEN_CONTEXT_STOP:
705 /* This is perfectly valid */
706 break;
707 default:
708 if (!sp_event_context_knot_mouseover(pc)) {
709 SnapManager &m = dt->namedview->snap_manager;
710 m.setup(dt);
711 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
712 }
713 break;
714 }
715 break;
716 default:
717 break;
718 }
719 return ret;
720 }
722 /**
723 * Handle mouse button release event.
724 */
725 static gint
726 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
727 {
728 if (pc->events_disabled) {
729 // skip event processing if events are disabled
730 return FALSE;
731 }
733 gint ret = FALSE;
734 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
735 if ( revent.button == 1 && !event_context->space_panning) {
737 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
739 Geom::Point const event_w(revent.x,
740 revent.y);
741 /* Find desktop coordinates */
742 Geom::Point p = pc->desktop->w2d(event_w);
744 /* Test whether we hit any anchor. */
745 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
747 switch (pc->mode) {
748 case SP_PEN_CONTEXT_MODE_CLICK:
749 switch (pc->state) {
750 case SP_PEN_CONTEXT_POINT:
751 if ( pc->npoints == 0 ) {
752 /* Start new thread only with button release */
753 if (anchor) {
754 p = anchor->dp;
755 }
756 pc->sa = anchor;
757 spdc_pen_set_initial_point(pc, p);
758 } else {
759 /* Set end anchor here */
760 pc->ea = anchor;
761 if (anchor) {
762 p = anchor->dp;
763 }
764 }
765 pc->state = SP_PEN_CONTEXT_CONTROL;
766 ret = TRUE;
767 break;
768 case SP_PEN_CONTEXT_CONTROL:
769 /* End current segment */
770 spdc_endpoint_snap(pc, p, revent.state);
771 spdc_pen_finish_segment(pc, p, revent.state);
772 pc->state = SP_PEN_CONTEXT_POINT;
773 ret = TRUE;
774 break;
775 case SP_PEN_CONTEXT_CLOSE:
776 /* End current segment */
777 if (!anchor) { /* Snap node only if not hitting anchor */
778 spdc_endpoint_snap(pc, p, revent.state);
779 }
780 spdc_pen_finish_segment(pc, p, revent.state);
781 spdc_pen_finish(pc, TRUE);
782 pc->state = SP_PEN_CONTEXT_POINT;
783 ret = TRUE;
784 break;
785 case SP_PEN_CONTEXT_STOP:
786 /* This is allowed, if we just canceled curve */
787 pc->state = SP_PEN_CONTEXT_POINT;
788 ret = TRUE;
789 break;
790 default:
791 break;
792 }
793 break;
794 case SP_PEN_CONTEXT_MODE_DRAG:
795 switch (pc->state) {
796 case SP_PEN_CONTEXT_POINT:
797 case SP_PEN_CONTEXT_CONTROL:
798 spdc_endpoint_snap(pc, p, revent.state);
799 spdc_pen_finish_segment(pc, p, revent.state);
800 break;
801 case SP_PEN_CONTEXT_CLOSE:
802 spdc_endpoint_snap(pc, p, revent.state);
803 spdc_pen_finish_segment(pc, p, revent.state);
804 if (pc->green_closed) {
805 // finishing at the start anchor, close curve
806 spdc_pen_finish(pc, TRUE);
807 } else {
808 // finishing at some other anchor, finish curve but not close
809 spdc_pen_finish(pc, FALSE);
810 }
811 break;
812 case SP_PEN_CONTEXT_STOP:
813 /* This is allowed, if we just cancelled curve */
814 break;
815 default:
816 break;
817 }
818 pc->state = SP_PEN_CONTEXT_POINT;
819 ret = TRUE;
820 break;
821 default:
822 break;
823 }
825 if (pc->grab) {
826 /* Release grab now */
827 sp_canvas_item_ungrab(pc->grab, revent.time);
828 pc->grab = NULL;
829 }
831 ret = TRUE;
833 dc->green_closed = FALSE;
834 }
836 // TODO: can we be sure that the path was created correctly?
837 // TODO: should we offer an option to collect the clicks in a list?
838 if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
839 sp_pen_context_set_polyline_mode(pc);
841 SPEventContext *ec = SP_EVENT_CONTEXT(pc);
842 Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
844 if (pc->waiting_LPE) {
845 // we have an already created LPE waiting for a path
846 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
847 selection->add(SP_OBJECT(pc->waiting_item));
848 pc->waiting_LPE = NULL;
849 } else {
850 // the case that we need to create a new LPE and apply it to the just-drawn path is
851 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
852 }
853 }
855 return ret;
856 }
858 static gint
859 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
860 {
861 gint ret = FALSE;
862 // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
863 if (pc->npoints != 0 && bevent.button == 1) {
864 spdc_pen_finish(pc, FALSE);
865 ret = TRUE;
866 }
867 return ret;
868 }
870 void
871 pen_redraw_all (SPPenContext *const pc)
872 {
873 // green
874 if (pc->green_bpaths) {
875 // remove old piecewise green canvasitems
876 while (pc->green_bpaths) {
877 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
878 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
879 }
880 // one canvas bpath for all of green_curve
881 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
882 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
883 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
885 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
886 }
888 if (pc->green_anchor)
889 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
891 pc->red_curve->reset();
892 pc->red_curve->moveto(pc->p[0]);
893 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
894 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
896 // handles
897 if (pc->p[0] != pc->p[1]) {
898 SP_CTRL(pc->c1)->moveto(pc->p[1]);
899 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
900 sp_canvas_item_show (pc->c1);
901 sp_canvas_item_show (pc->cl1);
902 } else {
903 sp_canvas_item_hide (pc->c1);
904 sp_canvas_item_hide (pc->cl1);
905 }
907 Geom::Curve const * last_seg = pc->green_curve->last_segment();
908 if (last_seg) {
909 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
910 if ( cubic &&
911 (*cubic)[2] != to_2geom(pc->p[0]) )
912 {
913 Geom::Point p2 = (*cubic)[2];
914 SP_CTRL(pc->c0)->moveto(p2);
915 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
916 sp_canvas_item_show (pc->c0);
917 sp_canvas_item_show (pc->cl0);
918 } else {
919 sp_canvas_item_hide (pc->c0);
920 sp_canvas_item_hide (pc->cl0);
921 }
922 }
923 }
925 void
926 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
927 {
928 if (pc->npoints != 5)
929 return;
931 // green
932 if (!pc->green_curve->is_empty()) {
933 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
934 } else {
935 // start anchor too
936 if (pc->green_anchor) {
937 pc->green_anchor->dp += Geom::Point(x, y);
938 }
939 }
941 // red
942 pc->p[0] += Geom::Point(x, y);
943 pc->p[1] += Geom::Point(x, y);
944 pen_redraw_all(pc);
945 }
947 void
948 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
949 {
950 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
951 }
953 void
954 pen_lastpoint_tocurve (SPPenContext *const pc)
955 {
956 if (pc->npoints != 5)
957 return;
959 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
960 if ( cubic ) {
961 pc->p[1] = pc->p[0] + (Geom::Point)( (*cubic)[3] - (*cubic)[2] );
962 } else {
963 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
964 }
966 pen_redraw_all(pc);
967 }
969 void
970 pen_lastpoint_toline (SPPenContext *const pc)
971 {
972 if (pc->npoints != 5)
973 return;
975 pc->p[1] = pc->p[0];
977 pen_redraw_all(pc);
978 }
981 static gint
982 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
983 {
985 gint ret = FALSE;
986 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
987 gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
989 switch (get_group0_keyval (&event->key)) {
991 case GDK_Left: // move last point left
992 case GDK_KP_Left:
993 case GDK_KP_4:
994 if (!MOD__CTRL) { // not ctrl
995 if (MOD__ALT) { // alt
996 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
997 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
998 }
999 else { // no alt
1000 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
1001 else pen_lastpoint_move(pc, -nudge, 0); // no shift
1002 }
1003 ret = TRUE;
1004 }
1005 break;
1006 case GDK_Up: // move last point up
1007 case GDK_KP_Up:
1008 case GDK_KP_8:
1009 if (!MOD__CTRL) { // not ctrl
1010 if (MOD__ALT) { // alt
1011 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
1012 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
1013 }
1014 else { // no alt
1015 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
1016 else pen_lastpoint_move(pc, 0, nudge); // no shift
1017 }
1018 ret = TRUE;
1019 }
1020 break;
1021 case GDK_Right: // move last point right
1022 case GDK_KP_Right:
1023 case GDK_KP_6:
1024 if (!MOD__CTRL) { // not ctrl
1025 if (MOD__ALT) { // alt
1026 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
1027 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
1028 }
1029 else { // no alt
1030 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
1031 else pen_lastpoint_move(pc, nudge, 0); // no shift
1032 }
1033 ret = TRUE;
1034 }
1035 break;
1036 case GDK_Down: // move last point down
1037 case GDK_KP_Down:
1038 case GDK_KP_2:
1039 if (!MOD__CTRL) { // not ctrl
1040 if (MOD__ALT) { // alt
1041 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
1042 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
1043 }
1044 else { // no alt
1045 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
1046 else pen_lastpoint_move(pc, 0, -nudge); // no shift
1047 }
1048 ret = TRUE;
1049 }
1050 break;
1052 /* TODO: this is not yet enabled?? looks like some traces of the Geometry tool
1053 case GDK_P:
1054 case GDK_p:
1055 if (MOD__SHIFT_ONLY) {
1056 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1057 ret = TRUE;
1058 }
1059 break;
1061 case GDK_C:
1062 case GDK_c:
1063 if (MOD__SHIFT_ONLY) {
1064 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1065 ret = TRUE;
1066 }
1067 break;
1069 case GDK_B:
1070 case GDK_b:
1071 if (MOD__SHIFT_ONLY) {
1072 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1073 ret = TRUE;
1074 }
1075 break;
1077 case GDK_A:
1078 case GDK_a:
1079 if (MOD__SHIFT_ONLY) {
1080 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1081 ret = TRUE;
1082 }
1083 break;
1084 */
1086 case GDK_U:
1087 case GDK_u:
1088 if (MOD__SHIFT_ONLY) {
1089 pen_lastpoint_tocurve(pc);
1090 ret = TRUE;
1091 }
1092 break;
1093 case GDK_L:
1094 case GDK_l:
1095 if (MOD__SHIFT_ONLY) {
1096 pen_lastpoint_toline(pc);
1097 ret = TRUE;
1098 }
1099 break;
1101 case GDK_Return:
1102 case GDK_KP_Enter:
1103 if (pc->npoints != 0) {
1104 spdc_pen_finish(pc, FALSE);
1105 ret = TRUE;
1106 }
1107 break;
1108 case GDK_Escape:
1109 if (pc->npoints != 0) {
1110 // if drawing, cancel, otherwise pass it up for deselecting
1111 pen_cancel (pc);
1112 ret = TRUE;
1113 }
1114 break;
1115 case GDK_z:
1116 case GDK_Z:
1117 if (MOD__CTRL_ONLY && pc->npoints != 0) {
1118 // if drawing, cancel, otherwise pass it up for undo
1119 pen_cancel (pc);
1120 ret = TRUE;
1121 }
1122 break;
1123 case GDK_g:
1124 case GDK_G:
1125 if (MOD__SHIFT_ONLY) {
1126 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
1127 ret = true;
1128 }
1129 break;
1130 case GDK_BackSpace:
1131 case GDK_Delete:
1132 case GDK_KP_Delete:
1133 if ( pc->green_curve->is_empty() || (pc->green_curve->last_segment() == NULL) ) {
1134 if (!pc->red_curve->is_empty()) {
1135 pen_cancel (pc);
1136 ret = TRUE;
1137 } else {
1138 // do nothing; this event should be handled upstream
1139 }
1140 } else {
1141 /* Reset red curve */
1142 pc->red_curve->reset();
1143 /* Destroy topmost green bpath */
1144 if (pc->green_bpaths) {
1145 if (pc->green_bpaths->data)
1146 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1147 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1148 }
1149 /* Get last segment */
1150 if ( pc->green_curve->is_empty() ) {
1151 g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1152 break;
1153 }
1154 // The code below assumes that pc->green_curve has only ONE path !
1155 Geom::Curve const * crv = pc->green_curve->last_segment();
1156 pc->p[0] = crv->initialPoint();
1157 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1158 pc->p[1] = (*cubic)[1];
1159 } else {
1160 pc->p[1] = pc->p[0];
1161 }
1162 Geom::Point const pt(( pc->npoints < 4
1163 ? (Geom::Point)(crv->finalPoint())
1164 : pc->p[3] ));
1165 pc->npoints = 2;
1166 pc->green_curve->backspace();
1167 sp_canvas_item_hide(pc->c0);
1168 sp_canvas_item_hide(pc->c1);
1169 sp_canvas_item_hide(pc->cl0);
1170 sp_canvas_item_hide(pc->cl1);
1171 pc->state = SP_PEN_CONTEXT_POINT;
1172 spdc_pen_set_subsequent_point(pc, pt, true);
1173 pen_last_paraxial_dir = !pen_last_paraxial_dir;
1174 ret = TRUE;
1175 }
1176 break;
1177 default:
1178 break;
1179 }
1180 return ret;
1181 }
1183 static void
1184 spdc_reset_colors(SPPenContext *pc)
1185 {
1186 /* Red */
1187 pc->red_curve->reset();
1188 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1189 /* Blue */
1190 pc->blue_curve->reset();
1191 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1192 /* Green */
1193 while (pc->green_bpaths) {
1194 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1195 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1196 }
1197 pc->green_curve->reset();
1198 if (pc->green_anchor) {
1199 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1200 }
1201 pc->sa = NULL;
1202 pc->ea = NULL;
1203 pc->npoints = 0;
1204 pc->red_curve_is_valid = false;
1205 }
1208 static void
1209 spdc_pen_set_initial_point(SPPenContext *const pc, Geom::Point const p)
1210 {
1211 g_assert( pc->npoints == 0 );
1213 pc->p[0] = p;
1214 pc->p[1] = p;
1215 pc->npoints = 2;
1216 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1218 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1219 }
1221 /**
1222 * Show the status message for the current line/curve segment.
1223 * This type of message always shows angle/distance as the last
1224 * two parameters ("angle %3.2f°, distance %s").
1225 */
1226 static void
1227 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, Geom::Point const p, int pc_point_to_compare, gchar const *message)
1228 {
1229 g_assert(pc != NULL);
1230 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1231 g_assert(message != NULL);
1233 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1234 Geom::Point rel = p - pc->p[pc_point_to_compare];
1235 GString *dist = SP_PX_TO_METRIC_STRING(Geom::L2(rel), desktop->namedview->getDefaultMetric());
1236 double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
1237 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1238 if (prefs->getBool("/options/compassangledisplay/value", 0) != 0)
1239 angle = angle_to_compass (angle);
1241 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1242 g_string_free(dist, FALSE);
1243 }
1245 static void
1246 spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status)
1247 {
1248 g_assert( pc->npoints != 0 );
1249 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1251 pc->p[2] = p;
1252 pc->p[3] = p;
1253 pc->p[4] = p;
1254 pc->npoints = 5;
1255 pc->red_curve->reset();
1256 bool is_curve;
1257 pc->red_curve->moveto(pc->p[0]);
1258 if (pc->polylines_paraxial && !statusbar) {
1259 // we are drawing horizontal/vertical lines and hit an anchor;
1260 Geom::Point const origin = pc->p[0];
1261 // if the previous point and the anchor are not aligned either horizontally or vertically...
1262 if ((abs(p[Geom::X] - origin[Geom::X]) > 1e-9) && (abs(p[Geom::Y] - origin[Geom::Y]) > 1e-9)) {
1263 // ...then we should draw an L-shaped path, consisting of two paraxial segments
1264 Geom::Point intermed = p;
1265 pen_set_to_nearest_horiz_vert(pc, intermed, status, false);
1266 pc->red_curve->lineto(intermed);
1267 }
1268 pc->red_curve->lineto(p);
1269 is_curve = false;
1270 } else {
1271 // one of the 'regular' modes
1272 if (pc->p[1] != pc->p[0]) {
1273 pc->red_curve->curveto(pc->p[1], p, p);
1274 is_curve = true;
1275 } else {
1276 pc->red_curve->lineto(p);
1277 is_curve = false;
1278 }
1279 }
1281 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1283 if (statusbar) {
1284 gchar *message = is_curve ?
1285 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1286 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1287 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1288 }
1289 }
1291 static void
1292 spdc_pen_set_ctrl(SPPenContext *const pc, Geom::Point const p, guint const state)
1293 {
1294 sp_canvas_item_show(pc->c1);
1295 sp_canvas_item_show(pc->cl1);
1297 if ( pc->npoints == 2 ) {
1298 pc->p[1] = p;
1299 sp_canvas_item_hide(pc->c0);
1300 sp_canvas_item_hide(pc->cl0);
1301 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1302 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1304 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"));
1305 } else if ( pc->npoints == 5 ) {
1306 pc->p[4] = p;
1307 sp_canvas_item_show(pc->c0);
1308 sp_canvas_item_show(pc->cl0);
1309 bool is_symm = false;
1310 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1311 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1312 Geom::Point delta = p - pc->p[3];
1313 pc->p[2] = pc->p[3] - delta;
1314 is_symm = true;
1315 pc->red_curve->reset();
1316 pc->red_curve->moveto(pc->p[0]);
1317 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1318 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1319 }
1320 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1321 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1322 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1323 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1325 gchar *message = is_symm ?
1326 _("<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") :
1327 _("<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");
1328 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1329 } else {
1330 g_warning("Something bad happened - npoints is %d", pc->npoints);
1331 }
1332 }
1334 static void
1335 spdc_pen_finish_segment(SPPenContext *const pc, Geom::Point const p, guint const state)
1336 {
1337 if (pc->polylines_paraxial) {
1338 pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
1339 }
1341 ++pc->num_clicks;
1343 if (!pc->red_curve->is_empty()) {
1344 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1345 SPCurve *curve = pc->red_curve->copy();
1346 /// \todo fixme:
1347 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1348 curve->unref();
1349 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1351 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1353 pc->p[0] = pc->p[3];
1354 pc->p[1] = pc->p[4];
1355 pc->npoints = 2;
1357 pc->red_curve->reset();
1358 }
1359 }
1361 static void
1362 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1363 {
1364 if (pc->expecting_clicks_for_LPE > 1) {
1365 // don't let the path be finished before we have collected the required number of mouse clicks
1366 return;
1367 }
1369 pc->num_clicks = 0;
1371 pen_disable_events(pc);
1373 SPDesktop *const desktop = pc->desktop;
1374 pc->_message_context->clear();
1375 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1377 pc->red_curve->reset();
1378 spdc_concat_colors_and_flush(pc, closed);
1379 pc->sa = NULL;
1380 pc->ea = NULL;
1382 pc->npoints = 0;
1383 pc->state = SP_PEN_CONTEXT_POINT;
1385 sp_canvas_item_hide(pc->c0);
1386 sp_canvas_item_hide(pc->c1);
1387 sp_canvas_item_hide(pc->cl0);
1388 sp_canvas_item_hide(pc->cl1);
1390 if (pc->green_anchor) {
1391 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1392 }
1395 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1397 pen_enable_events(pc);
1398 }
1400 static void
1401 pen_disable_events(SPPenContext *const pc) {
1402 pc->events_disabled++;
1403 }
1405 static void
1406 pen_enable_events(SPPenContext *const pc) {
1407 g_return_if_fail(pc->events_disabled != 0);
1409 pc->events_disabled--;
1410 }
1412 void
1413 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1414 unsigned int num_clicks, bool use_polylines)
1415 {
1416 if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
1417 return;
1419 pc->waiting_LPE_type = effect_type;
1420 pc->expecting_clicks_for_LPE = num_clicks;
1421 pc->polylines_only = use_polylines;
1422 pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
1423 }
1425 void
1426 sp_pen_context_cancel_waiting_for_LPE(SPPenContext *pc)
1427 {
1428 pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
1429 pc->expecting_clicks_for_LPE = 0;
1430 sp_pen_context_set_polyline_mode(pc);
1431 }
1433 static int pen_next_paraxial_direction(const SPPenContext *const pc,
1434 Geom::Point const &pt, Geom::Point const &origin, guint state) {
1435 /*
1436 * after the first mouse click we determine whether the mouse pointer is closest to a
1437 * horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
1438 * orthogonal to the last one; pressing Shift toggles the direction
1439 */
1440 // num_clicks is not reliable because spdc_pen_finish_segment is sometimes called too early
1441 // (on first mouse release), in which case num_clicks immediately becomes 1.
1442 // if (pc->num_clicks == 0) {
1444 if (pc->green_curve->is_empty()) {
1445 // first mouse click
1446 double dist_h = fabs(pt[Geom::X] - origin[Geom::X]);
1447 double dist_v = fabs(pt[Geom::Y] - origin[Geom::Y]);
1448 int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
1449 pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
1450 return pen_last_paraxial_dir;
1451 } else {
1452 // subsequent mouse click
1453 return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
1454 }
1455 }
1457 void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap)
1458 {
1459 Geom::Point const origin = pc->p[0];
1461 int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
1463 if (!snap) {
1464 if (next_dir == 0) {
1465 // line is forced to be horizontal
1466 pt[Geom::Y] = origin[Geom::Y];
1467 } else {
1468 // line is forced to be vertical
1469 pt[Geom::X] = origin[Geom::X];
1470 }
1471 } else {
1472 // Create a horizontal or vertical constraint line
1473 Inkscape::Snapper::ConstraintLine cl(origin, next_dir ? Geom::Point(0, 1) : Geom::Point(1, 0));
1475 // Snap along the constraint line; if we didn't snap then still the constraint will be applied
1476 SnapManager &m = pc->desktop->namedview->snap_manager;
1478 Inkscape::Selection *selection = sp_desktop_selection (pc->desktop);
1479 // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
1480 // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
1482 m.setup(pc->desktop, true, selection->singleItem());
1483 m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
1484 }
1485 }
1487 /*
1488 Local Variables:
1489 mode:c++
1490 c-file-style:"stroustrup"
1491 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1492 indent-tabs-mode:nil
1493 fill-column:99
1494 End:
1495 */
1496 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :