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 }
662 spdc_pen_set_subsequent_point(pc, p, !anchor, mevent.state);
664 if (anchor && !pc->anchor_statusbar) {
665 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
666 pc->anchor_statusbar = true;
667 } else if (!anchor && pc->anchor_statusbar) {
668 pc->_message_context->clear();
669 pc->anchor_statusbar = false;
670 }
672 ret = TRUE;
673 } else {
674 if (anchor && !pc->anchor_statusbar) {
675 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
676 pc->anchor_statusbar = true;
677 } else if (!anchor && pc->anchor_statusbar) {
678 pc->_message_context->clear();
679 pc->anchor_statusbar = false;
680 }
681 if (!sp_event_context_knot_mouseover(pc)) {
682 SnapManager &m = dt->namedview->snap_manager;
683 m.setup(dt);
684 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
685 }
686 }
687 break;
688 case SP_PEN_CONTEXT_CONTROL:
689 case SP_PEN_CONTEXT_CLOSE:
690 /* Placing controls is last operation in CLOSE state */
692 // snap the handle
693 spdc_endpoint_snap_handle(pc, p, mevent.state);
695 if (!pc->polylines_only) {
696 spdc_pen_set_ctrl(pc, p, mevent.state);
697 } else {
698 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
699 }
700 gobble_motion_events(GDK_BUTTON1_MASK);
701 ret = TRUE;
702 break;
703 case SP_PEN_CONTEXT_STOP:
704 /* This is perfectly valid */
705 break;
706 default:
707 if (!sp_event_context_knot_mouseover(pc)) {
708 SnapManager &m = dt->namedview->snap_manager;
709 m.setup(dt);
710 m.preSnap(Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_NODE_HANDLE));
711 }
712 break;
713 }
714 break;
715 default:
716 break;
717 }
718 return ret;
719 }
721 /**
722 * Handle mouse button release event.
723 */
724 static gint
725 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
726 {
727 if (pc->events_disabled) {
728 // skip event processing if events are disabled
729 return FALSE;
730 }
732 gint ret = FALSE;
733 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
734 if ( revent.button == 1 && !event_context->space_panning) {
736 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
738 Geom::Point const event_w(revent.x,
739 revent.y);
740 /* Find desktop coordinates */
741 Geom::Point p = pc->desktop->w2d(event_w);
743 /* Test whether we hit any anchor. */
744 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
746 switch (pc->mode) {
747 case SP_PEN_CONTEXT_MODE_CLICK:
748 switch (pc->state) {
749 case SP_PEN_CONTEXT_POINT:
750 if ( pc->npoints == 0 ) {
751 /* Start new thread only with button release */
752 if (anchor) {
753 p = anchor->dp;
754 }
755 pc->sa = anchor;
756 spdc_pen_set_initial_point(pc, p);
757 } else {
758 /* Set end anchor here */
759 pc->ea = anchor;
760 if (anchor) {
761 p = anchor->dp;
762 }
763 }
764 pc->state = SP_PEN_CONTEXT_CONTROL;
765 ret = TRUE;
766 break;
767 case SP_PEN_CONTEXT_CONTROL:
768 /* End current segment */
769 spdc_endpoint_snap(pc, p, revent.state);
770 spdc_pen_finish_segment(pc, p, revent.state);
771 pc->state = SP_PEN_CONTEXT_POINT;
772 ret = TRUE;
773 break;
774 case SP_PEN_CONTEXT_CLOSE:
775 /* End current segment */
776 if (!anchor) { /* Snap node only if not hitting anchor */
777 spdc_endpoint_snap(pc, p, revent.state);
778 }
779 spdc_pen_finish_segment(pc, p, revent.state);
780 spdc_pen_finish(pc, TRUE);
781 pc->state = SP_PEN_CONTEXT_POINT;
782 ret = TRUE;
783 break;
784 case SP_PEN_CONTEXT_STOP:
785 /* This is allowed, if we just canceled curve */
786 pc->state = SP_PEN_CONTEXT_POINT;
787 ret = TRUE;
788 break;
789 default:
790 break;
791 }
792 break;
793 case SP_PEN_CONTEXT_MODE_DRAG:
794 switch (pc->state) {
795 case SP_PEN_CONTEXT_POINT:
796 case SP_PEN_CONTEXT_CONTROL:
797 spdc_endpoint_snap(pc, p, revent.state);
798 spdc_pen_finish_segment(pc, p, revent.state);
799 break;
800 case SP_PEN_CONTEXT_CLOSE:
801 spdc_endpoint_snap(pc, p, revent.state);
802 spdc_pen_finish_segment(pc, p, revent.state);
803 if (pc->green_closed) {
804 // finishing at the start anchor, close curve
805 spdc_pen_finish(pc, TRUE);
806 } else {
807 // finishing at some other anchor, finish curve but not close
808 spdc_pen_finish(pc, FALSE);
809 }
810 break;
811 case SP_PEN_CONTEXT_STOP:
812 /* This is allowed, if we just cancelled curve */
813 break;
814 default:
815 break;
816 }
817 pc->state = SP_PEN_CONTEXT_POINT;
818 ret = TRUE;
819 break;
820 default:
821 break;
822 }
824 if (pc->grab) {
825 /* Release grab now */
826 sp_canvas_item_ungrab(pc->grab, revent.time);
827 pc->grab = NULL;
828 }
830 ret = TRUE;
832 dc->green_closed = FALSE;
833 }
835 // TODO: can we be sure that the path was created correctly?
836 // TODO: should we offer an option to collect the clicks in a list?
837 if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
838 sp_pen_context_set_polyline_mode(pc);
840 SPEventContext *ec = SP_EVENT_CONTEXT(pc);
841 Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
843 if (pc->waiting_LPE) {
844 // we have an already created LPE waiting for a path
845 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
846 selection->add(SP_OBJECT(pc->waiting_item));
847 pc->waiting_LPE = NULL;
848 } else {
849 // the case that we need to create a new LPE and apply it to the just-drawn path is
850 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
851 }
852 }
854 return ret;
855 }
857 static gint
858 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
859 {
860 gint ret = FALSE;
861 // only end on LMB double click. Otherwise horizontal scrolling causes ending of the path
862 if (pc->npoints != 0 && bevent.button == 1) {
863 spdc_pen_finish(pc, FALSE);
864 ret = TRUE;
865 }
866 return ret;
867 }
869 void
870 pen_redraw_all (SPPenContext *const pc)
871 {
872 // green
873 if (pc->green_bpaths) {
874 // remove old piecewise green canvasitems
875 while (pc->green_bpaths) {
876 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
877 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
878 }
879 // one canvas bpath for all of green_curve
880 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
881 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
882 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
884 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
885 }
887 if (pc->green_anchor)
888 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
890 pc->red_curve->reset();
891 pc->red_curve->moveto(pc->p[0]);
892 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
893 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
895 // handles
896 if (pc->p[0] != pc->p[1]) {
897 SP_CTRL(pc->c1)->moveto(pc->p[1]);
898 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
899 sp_canvas_item_show (pc->c1);
900 sp_canvas_item_show (pc->cl1);
901 } else {
902 sp_canvas_item_hide (pc->c1);
903 sp_canvas_item_hide (pc->cl1);
904 }
906 Geom::Curve const * last_seg = pc->green_curve->last_segment();
907 if (last_seg) {
908 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
909 if ( cubic &&
910 (*cubic)[2] != to_2geom(pc->p[0]) )
911 {
912 Geom::Point p2 = (*cubic)[2];
913 SP_CTRL(pc->c0)->moveto(p2);
914 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
915 sp_canvas_item_show (pc->c0);
916 sp_canvas_item_show (pc->cl0);
917 } else {
918 sp_canvas_item_hide (pc->c0);
919 sp_canvas_item_hide (pc->cl0);
920 }
921 }
922 }
924 void
925 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
926 {
927 if (pc->npoints != 5)
928 return;
930 // green
931 if (!pc->green_curve->is_empty()) {
932 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
933 } else {
934 // start anchor too
935 if (pc->green_anchor) {
936 pc->green_anchor->dp += Geom::Point(x, y);
937 }
938 }
940 // red
941 pc->p[0] += Geom::Point(x, y);
942 pc->p[1] += Geom::Point(x, y);
943 pen_redraw_all(pc);
944 }
946 void
947 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
948 {
949 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
950 }
952 void
953 pen_lastpoint_tocurve (SPPenContext *const pc)
954 {
955 if (pc->npoints != 5)
956 return;
958 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
959 if ( cubic ) {
960 pc->p[1] = pc->p[0] + (Geom::Point)( (*cubic)[3] - (*cubic)[2] );
961 } else {
962 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
963 }
965 pen_redraw_all(pc);
966 }
968 void
969 pen_lastpoint_toline (SPPenContext *const pc)
970 {
971 if (pc->npoints != 5)
972 return;
974 pc->p[1] = pc->p[0];
976 pen_redraw_all(pc);
977 }
980 static gint
981 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
982 {
984 gint ret = FALSE;
985 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
986 gdouble const nudge = prefs->getDoubleLimited("/options/nudgedistance/value", 2, 0, 1000); // in px
988 switch (get_group0_keyval (&event->key)) {
990 case GDK_Left: // move last point left
991 case GDK_KP_Left:
992 case GDK_KP_4:
993 if (!MOD__CTRL) { // not ctrl
994 if (MOD__ALT) { // alt
995 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
996 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
997 }
998 else { // no alt
999 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
1000 else pen_lastpoint_move(pc, -nudge, 0); // no shift
1001 }
1002 ret = TRUE;
1003 }
1004 break;
1005 case GDK_Up: // move last point up
1006 case GDK_KP_Up:
1007 case GDK_KP_8:
1008 if (!MOD__CTRL) { // not ctrl
1009 if (MOD__ALT) { // alt
1010 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
1011 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
1012 }
1013 else { // no alt
1014 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
1015 else pen_lastpoint_move(pc, 0, nudge); // no shift
1016 }
1017 ret = TRUE;
1018 }
1019 break;
1020 case GDK_Right: // move last point right
1021 case GDK_KP_Right:
1022 case GDK_KP_6:
1023 if (!MOD__CTRL) { // not ctrl
1024 if (MOD__ALT) { // alt
1025 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
1026 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
1027 }
1028 else { // no alt
1029 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
1030 else pen_lastpoint_move(pc, nudge, 0); // no shift
1031 }
1032 ret = TRUE;
1033 }
1034 break;
1035 case GDK_Down: // move last point down
1036 case GDK_KP_Down:
1037 case GDK_KP_2:
1038 if (!MOD__CTRL) { // not ctrl
1039 if (MOD__ALT) { // alt
1040 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
1041 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
1042 }
1043 else { // no alt
1044 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
1045 else pen_lastpoint_move(pc, 0, -nudge); // no shift
1046 }
1047 ret = TRUE;
1048 }
1049 break;
1051 /* TODO: this is not yet enabled?? looks like some traces of the Geometry tool
1052 case GDK_P:
1053 case GDK_p:
1054 if (MOD__SHIFT_ONLY) {
1055 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1056 ret = TRUE;
1057 }
1058 break;
1060 case GDK_C:
1061 case GDK_c:
1062 if (MOD__SHIFT_ONLY) {
1063 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1064 ret = TRUE;
1065 }
1066 break;
1068 case GDK_B:
1069 case GDK_b:
1070 if (MOD__SHIFT_ONLY) {
1071 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1072 ret = TRUE;
1073 }
1074 break;
1076 case GDK_A:
1077 case GDK_a:
1078 if (MOD__SHIFT_ONLY) {
1079 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1080 ret = TRUE;
1081 }
1082 break;
1083 */
1085 case GDK_U:
1086 case GDK_u:
1087 if (MOD__SHIFT_ONLY) {
1088 pen_lastpoint_tocurve(pc);
1089 ret = TRUE;
1090 }
1091 break;
1092 case GDK_L:
1093 case GDK_l:
1094 if (MOD__SHIFT_ONLY) {
1095 pen_lastpoint_toline(pc);
1096 ret = TRUE;
1097 }
1098 break;
1100 case GDK_Return:
1101 case GDK_KP_Enter:
1102 if (pc->npoints != 0) {
1103 spdc_pen_finish(pc, FALSE);
1104 ret = TRUE;
1105 }
1106 break;
1107 case GDK_Escape:
1108 if (pc->npoints != 0) {
1109 // if drawing, cancel, otherwise pass it up for deselecting
1110 pen_cancel (pc);
1111 ret = TRUE;
1112 }
1113 break;
1114 case GDK_z:
1115 case GDK_Z:
1116 if (MOD__CTRL_ONLY && pc->npoints != 0) {
1117 // if drawing, cancel, otherwise pass it up for undo
1118 pen_cancel (pc);
1119 ret = TRUE;
1120 }
1121 break;
1122 case GDK_g:
1123 case GDK_G:
1124 if (MOD__SHIFT_ONLY) {
1125 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
1126 ret = true;
1127 }
1128 break;
1129 case GDK_BackSpace:
1130 case GDK_Delete:
1131 case GDK_KP_Delete:
1132 if ( pc->green_curve->is_empty() || (pc->green_curve->last_segment() == NULL) ) {
1133 if (!pc->red_curve->is_empty()) {
1134 pen_cancel (pc);
1135 ret = TRUE;
1136 } else {
1137 // do nothing; this event should be handled upstream
1138 }
1139 } else {
1140 /* Reset red curve */
1141 pc->red_curve->reset();
1142 /* Destroy topmost green bpath */
1143 if (pc->green_bpaths) {
1144 if (pc->green_bpaths->data)
1145 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1146 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1147 }
1148 /* Get last segment */
1149 if ( pc->green_curve->is_empty() ) {
1150 g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1151 break;
1152 }
1153 // The code below assumes that pc->green_curve has only ONE path !
1154 Geom::Curve const * crv = pc->green_curve->last_segment();
1155 pc->p[0] = crv->initialPoint();
1156 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1157 pc->p[1] = (*cubic)[1];
1158 } else {
1159 pc->p[1] = pc->p[0];
1160 }
1161 Geom::Point const pt(( pc->npoints < 4
1162 ? (Geom::Point)(crv->finalPoint())
1163 : pc->p[3] ));
1164 pc->npoints = 2;
1165 pc->green_curve->backspace();
1166 sp_canvas_item_hide(pc->c0);
1167 sp_canvas_item_hide(pc->c1);
1168 sp_canvas_item_hide(pc->cl0);
1169 sp_canvas_item_hide(pc->cl1);
1170 pc->state = SP_PEN_CONTEXT_POINT;
1171 spdc_pen_set_subsequent_point(pc, pt, true);
1172 ret = TRUE;
1173 }
1174 break;
1175 default:
1176 break;
1177 }
1178 return ret;
1179 }
1181 static void
1182 spdc_reset_colors(SPPenContext *pc)
1183 {
1184 /* Red */
1185 pc->red_curve->reset();
1186 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1187 /* Blue */
1188 pc->blue_curve->reset();
1189 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1190 /* Green */
1191 while (pc->green_bpaths) {
1192 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1193 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1194 }
1195 pc->green_curve->reset();
1196 if (pc->green_anchor) {
1197 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1198 }
1199 pc->sa = NULL;
1200 pc->ea = NULL;
1201 pc->npoints = 0;
1202 pc->red_curve_is_valid = false;
1203 }
1206 static void
1207 spdc_pen_set_initial_point(SPPenContext *const pc, Geom::Point const p)
1208 {
1209 g_assert( pc->npoints == 0 );
1211 pc->p[0] = p;
1212 pc->p[1] = p;
1213 pc->npoints = 2;
1214 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1216 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1217 }
1219 /**
1220 * Show the status message for the current line/curve segment.
1221 * This type of message always shows angle/distance as the last
1222 * two parameters ("angle %3.2f°, distance %s").
1223 */
1224 static void
1225 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, Geom::Point const p, int pc_point_to_compare, gchar const *message)
1226 {
1227 g_assert(pc != NULL);
1228 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1229 g_assert(message != NULL);
1231 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1232 Geom::Point rel = p - pc->p[pc_point_to_compare];
1233 GString *dist = SP_PX_TO_METRIC_STRING(Geom::L2(rel), desktop->namedview->getDefaultMetric());
1234 double angle = atan2(rel[Geom::Y], rel[Geom::X]) * 180 / M_PI;
1235 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
1236 if (prefs->getBool("/options/compassangledisplay/value", 0) != 0)
1237 angle = angle_to_compass (angle);
1239 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1240 g_string_free(dist, FALSE);
1241 }
1243 static void
1244 spdc_pen_set_subsequent_point(SPPenContext *const pc, Geom::Point const p, bool statusbar, guint status)
1245 {
1246 g_assert( pc->npoints != 0 );
1247 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1249 pc->p[2] = p;
1250 pc->p[3] = p;
1251 pc->p[4] = p;
1252 pc->npoints = 5;
1253 pc->red_curve->reset();
1254 bool is_curve;
1255 pc->red_curve->moveto(pc->p[0]);
1256 if (pc->polylines_paraxial && !statusbar) {
1257 // we are drawing horizontal/vertical lines and hit an anchor; draw an L-shaped path
1258 Geom::Point intermed = p;
1259 pen_set_to_nearest_horiz_vert(pc, intermed, status, false);
1260 pc->red_curve->lineto(intermed);
1261 pc->red_curve->lineto(p);
1262 is_curve = false;
1263 } else {
1264 // one of the 'regular' modes
1265 if (pc->p[1] != pc->p[0])
1266 {
1267 pc->red_curve->curveto(pc->p[1], p, p);
1268 is_curve = true;
1269 } else {
1270 pc->red_curve->lineto(p);
1271 is_curve = false;
1272 }
1273 }
1275 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1277 if (statusbar) {
1278 gchar *message = is_curve ?
1279 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1280 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1281 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1282 }
1283 }
1285 static void
1286 spdc_pen_set_ctrl(SPPenContext *const pc, Geom::Point const p, guint const state)
1287 {
1288 sp_canvas_item_show(pc->c1);
1289 sp_canvas_item_show(pc->cl1);
1291 if ( pc->npoints == 2 ) {
1292 pc->p[1] = p;
1293 sp_canvas_item_hide(pc->c0);
1294 sp_canvas_item_hide(pc->cl0);
1295 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1296 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1298 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"));
1299 } else if ( pc->npoints == 5 ) {
1300 pc->p[4] = p;
1301 sp_canvas_item_show(pc->c0);
1302 sp_canvas_item_show(pc->cl0);
1303 bool is_symm = false;
1304 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1305 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1306 Geom::Point delta = p - pc->p[3];
1307 pc->p[2] = pc->p[3] - delta;
1308 is_symm = true;
1309 pc->red_curve->reset();
1310 pc->red_curve->moveto(pc->p[0]);
1311 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1312 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1313 }
1314 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1315 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1316 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1317 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1319 gchar *message = is_symm ?
1320 _("<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") :
1321 _("<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");
1322 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1323 } else {
1324 g_warning("Something bad happened - npoints is %d", pc->npoints);
1325 }
1326 }
1328 static void
1329 spdc_pen_finish_segment(SPPenContext *const pc, Geom::Point const p, guint const state)
1330 {
1331 if (pc->polylines_paraxial) {
1332 pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
1333 }
1334 ++pc->num_clicks;
1336 if (!pc->red_curve->is_empty()) {
1337 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1338 SPCurve *curve = pc->red_curve->copy();
1339 /// \todo fixme:
1340 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1341 curve->unref();
1342 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1344 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1346 pc->p[0] = pc->p[3];
1347 pc->p[1] = pc->p[4];
1348 pc->npoints = 2;
1350 pc->red_curve->reset();
1351 }
1352 }
1354 static void
1355 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1356 {
1357 if (pc->expecting_clicks_for_LPE > 1) {
1358 // don't let the path be finished before we have collected the required number of mouse clicks
1359 return;
1360 }
1362 pc->num_clicks = 0;
1364 pen_disable_events(pc);
1366 SPDesktop *const desktop = pc->desktop;
1367 pc->_message_context->clear();
1368 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1370 pc->red_curve->reset();
1371 spdc_concat_colors_and_flush(pc, closed);
1372 pc->sa = NULL;
1373 pc->ea = NULL;
1375 pc->npoints = 0;
1376 pc->state = SP_PEN_CONTEXT_POINT;
1378 sp_canvas_item_hide(pc->c0);
1379 sp_canvas_item_hide(pc->c1);
1380 sp_canvas_item_hide(pc->cl0);
1381 sp_canvas_item_hide(pc->cl1);
1383 if (pc->green_anchor) {
1384 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1385 }
1388 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1390 pen_enable_events(pc);
1391 }
1393 static void
1394 pen_disable_events(SPPenContext *const pc) {
1395 pc->events_disabled++;
1396 }
1398 static void
1399 pen_enable_events(SPPenContext *const pc) {
1400 g_return_if_fail(pc->events_disabled != 0);
1402 pc->events_disabled--;
1403 }
1405 void
1406 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1407 unsigned int num_clicks, bool use_polylines)
1408 {
1409 if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
1410 return;
1412 pc->waiting_LPE_type = effect_type;
1413 pc->expecting_clicks_for_LPE = num_clicks;
1414 pc->polylines_only = use_polylines;
1415 pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
1416 }
1418 void
1419 sp_pen_context_cancel_waiting_for_LPE(SPPenContext *pc)
1420 {
1421 pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
1422 pc->expecting_clicks_for_LPE = 0;
1423 sp_pen_context_set_polyline_mode(pc);
1424 }
1426 static int pen_next_paraxial_direction(const SPPenContext *const pc,
1427 Geom::Point const &pt, Geom::Point const &origin, guint state) {
1428 /*
1429 * after the first mouse click we determine whether the mouse pointer is closest to a
1430 * horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
1431 * orthogonal to the last one; pressing Shift toggles the direction
1432 */
1433 if (pc->num_clicks == 0) {
1434 // first mouse click
1435 double dist_h = fabs(pt[Geom::X] - origin[Geom::X]);
1436 double dist_v = fabs(pt[Geom::Y] - origin[Geom::Y]);
1437 int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
1438 pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
1439 return pen_last_paraxial_dir;
1440 } else {
1441 // subsequent mouse click
1442 return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
1443 }
1444 }
1446 void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, Geom::Point &pt, guint const state, bool snap)
1447 {
1448 Geom::Point const &origin = pc->p[0];
1450 int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
1452 if (!snap) {
1453 if (next_dir == 0) {
1454 // line is forced to be horizontal
1455 pt[Geom::Y] = origin[Geom::Y];
1456 } else {
1457 // line is forced to be vertical
1458 pt[Geom::X] = origin[Geom::X];
1459 }
1460 } else {
1461 // Create a horizontal or vertical constraint line
1462 Inkscape::Snapper::ConstraintLine cl(origin, next_dir ? Geom::Point(0, 1) : Geom::Point(1, 0));
1464 // Snap along the constraint line; if we didn't snap then still the constraint will be applied
1465 SnapManager &m = pc->desktop->namedview->snap_manager;
1467 Inkscape::Selection *selection = sp_desktop_selection (pc->desktop);
1468 // selection->singleItem() is the item that is currently being drawn. This item will not be snapped to (to avoid self-snapping)
1469 // TODO: Allow snapping to the stationary parts of the item, and only ignore the last segment
1471 m.setup(pc->desktop, true, selection->singleItem());
1472 m.constrainedSnapReturnByRef(pt, Inkscape::SNAPSOURCE_NODE_HANDLE, cl);
1473 }
1474 }
1476 /*
1477 Local Variables:
1478 mode:c++
1479 c-file-style:"stroustrup"
1480 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1481 indent-tabs-mode:nil
1482 fill-column:99
1483 End:
1484 */
1485 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :