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 "prefs-utils.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, gchar const *key, gchar const *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, NR::Point const p);
57 static void spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar, guint status = 0);
58 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
59 static void spdc_pen_finish_segment(SPPenContext *pc, NR::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 NR::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, NR::Point const &pt, NR::Point const &origin, guint state);
79 static void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, NR::Point &pt, guint const state);
80 static NR::Point pen_get_intermediate_horiz_vert(const SPPenContext *const pc, NR::Point const &pt, guint const state);
82 static int pen_last_paraxial_dir = 0; // last used direction in horizontal/vertical mode; 0 = horizontal, 1 = vertical
84 /**
85 * Register SPPenContext with Gdk and return its type.
86 */
87 GType
88 sp_pen_context_get_type(void)
89 {
90 static GType type = 0;
91 if (!type) {
92 GTypeInfo info = {
93 sizeof(SPPenContextClass),
94 NULL, NULL,
95 (GClassInitFunc) sp_pen_context_class_init,
96 NULL, NULL,
97 sizeof(SPPenContext),
98 4,
99 (GInstanceInitFunc) sp_pen_context_init,
100 NULL, /* value_table */
101 };
102 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
103 }
104 return type;
105 }
107 /**
108 * Initialize the SPPenContext vtable.
109 */
110 static void
111 sp_pen_context_class_init(SPPenContextClass *klass)
112 {
113 GObjectClass *object_class;
114 SPEventContextClass *event_context_class;
116 object_class = (GObjectClass *) klass;
117 event_context_class = (SPEventContextClass *) klass;
119 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
121 object_class->dispose = sp_pen_context_dispose;
123 event_context_class->setup = sp_pen_context_setup;
124 event_context_class->finish = sp_pen_context_finish;
125 event_context_class->set = sp_pen_context_set;
126 event_context_class->root_handler = sp_pen_context_root_handler;
127 event_context_class->item_handler = sp_pen_context_item_handler;
128 }
130 /**
131 * Callback to initialize SPPenContext object.
132 */
133 static void
134 sp_pen_context_init(SPPenContext *pc)
135 {
137 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
139 event_context->cursor_shape = cursor_pen_xpm;
140 event_context->hot_x = 4;
141 event_context->hot_y = 4;
143 pc->npoints = 0;
144 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
145 pc->state = SP_PEN_CONTEXT_POINT;
147 pc->c0 = NULL;
148 pc->c1 = NULL;
149 pc->cl0 = NULL;
150 pc->cl1 = NULL;
152 pc->events_disabled = 0;
154 pc->num_clicks = 0;
155 pc->waiting_LPE = NULL;
156 pc->waiting_item = NULL;
157 }
159 /**
160 * Callback to destroy the SPPenContext object's members and itself.
161 */
162 static void
163 sp_pen_context_dispose(GObject *object)
164 {
165 SPPenContext *pc;
167 pc = SP_PEN_CONTEXT(object);
169 if (pc->c0) {
170 gtk_object_destroy(GTK_OBJECT(pc->c0));
171 pc->c0 = NULL;
172 }
173 if (pc->c1) {
174 gtk_object_destroy(GTK_OBJECT(pc->c1));
175 pc->c1 = NULL;
176 }
177 if (pc->cl0) {
178 gtk_object_destroy(GTK_OBJECT(pc->cl0));
179 pc->cl0 = NULL;
180 }
181 if (pc->cl1) {
182 gtk_object_destroy(GTK_OBJECT(pc->cl1));
183 pc->cl1 = NULL;
184 }
186 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
188 if (pc->expecting_clicks_for_LPE > 0) {
189 // we received too few clicks to sanely set the parameter path so we remove the LPE from the item
190 sp_lpe_item_remove_current_path_effect(pc->waiting_item, false);
191 }
192 }
194 void
195 sp_pen_context_set_polyline_mode(SPPenContext *const pc) {
196 guint mode = prefs_get_int_attribute("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 if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
237 ec->enableSelectionCue();
238 }
239 }
241 static void
242 pen_cancel (SPPenContext *const pc)
243 {
244 pc->num_clicks = 0;
245 pc->state = SP_PEN_CONTEXT_STOP;
246 spdc_reset_colors(pc);
247 sp_canvas_item_hide(pc->c0);
248 sp_canvas_item_hide(pc->c1);
249 sp_canvas_item_hide(pc->cl0);
250 sp_canvas_item_hide(pc->cl1);
251 pc->_message_context->clear();
252 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
254 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
255 }
257 /**
258 * Finalization callback.
259 */
260 static void
261 sp_pen_context_finish(SPEventContext *ec)
262 {
263 SPPenContext *pc = SP_PEN_CONTEXT(ec);
265 if (pc->npoints != 0) {
266 pen_cancel (pc);
267 }
269 if (((SPEventContextClass *) pen_parent_class)->finish) {
270 ((SPEventContextClass *) pen_parent_class)->finish(ec);
271 }
272 }
274 /**
275 * Callback that sets key to value in pen context.
276 */
277 static void
278 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
279 {
280 SPPenContext *pc = SP_PEN_CONTEXT(ec);
282 if (!strcmp(key, "mode")) {
283 if ( val && !strcmp(val, "drag") ) {
284 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
285 } else {
286 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
287 }
288 }
289 }
291 /**
292 * Snaps new node relative to the previous node.
293 */
294 static void
295 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
296 {
297 if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
298 if (pc->npoints > 0) {
299 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
300 }
301 } else {
302 if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
303 //After all, the user explicitely asked for angular snapping by
304 //pressing CTRL
305 spdc_endpoint_snap_free(pc, p, state);
306 }
307 }
308 if (pc->polylines_paraxial) {
309 // TODO: must we avoid one of the snaps in the previous case distinction in some situations?
310 pen_set_to_nearest_horiz_vert(pc, p, state);
311 }
312 }
314 /**
315 * Snaps new node's handle relative to the new node.
316 */
317 static void
318 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
319 {
320 g_return_if_fail(( pc->npoints == 2 ||
321 pc->npoints == 5 ));
323 if ((state & GDK_CONTROL_MASK)) { //CTRL enables angular snapping
324 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
325 } else {
326 if (!(state & GDK_SHIFT_MASK)) { //SHIFT disables all snapping, except the angular snapping above
327 spdc_endpoint_snap_free(pc, p, state);
328 }
329 }
330 }
332 static gint
333 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
334 {
335 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
337 gint ret = FALSE;
339 switch (event->type) {
340 case GDK_BUTTON_PRESS:
341 ret = pen_handle_button_press(pc, event->button);
342 break;
343 case GDK_BUTTON_RELEASE:
344 ret = pen_handle_button_release(pc, event->button);
345 break;
346 default:
347 break;
348 }
350 if (!ret) {
351 if (((SPEventContextClass *) pen_parent_class)->item_handler)
352 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
353 }
355 return ret;
356 }
358 /**
359 * Callback to handle all pen events.
360 */
361 static gint
362 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
363 {
364 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
366 gint ret = FALSE;
368 switch (event->type) {
369 case GDK_BUTTON_PRESS:
370 ret = pen_handle_button_press(pc, event->button);
371 break;
373 case GDK_MOTION_NOTIFY:
374 ret = pen_handle_motion_notify(pc, event->motion);
375 break;
377 case GDK_BUTTON_RELEASE:
378 ret = pen_handle_button_release(pc, event->button);
379 break;
381 case GDK_2BUTTON_PRESS:
382 ret = pen_handle_2button_press(pc, event->button);
383 break;
385 case GDK_KEY_PRESS:
386 ret = pen_handle_key_press(pc, event);
387 break;
389 default:
390 break;
391 }
393 if (!ret) {
394 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
395 = ((SPEventContextClass *) pen_parent_class)->root_handler;
396 if (parent_root_handler) {
397 ret = parent_root_handler(ec, event);
398 }
399 }
401 return ret;
402 }
404 /**
405 * Handle mouse button press event.
406 */
407 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
408 {
409 if (pc->events_disabled) {
410 // skip event processing if events are disabled
411 return FALSE;
412 }
414 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
415 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
416 NR::Point const event_w(bevent.x, bevent.y);
417 NR::Point const event_dt(desktop->w2d(event_w));
418 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
420 gint ret = FALSE;
421 if (bevent.button == 1 && !event_context->space_panning
422 // make sure this is not the last click for a waiting LPE (otherwise we want to finish the path)
423 && pc->expecting_clicks_for_LPE != 1) {
425 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
426 return TRUE;
427 }
429 if (!pc->grab ) {
430 /* Grab mouse, so release will not pass unnoticed */
431 pc->grab = SP_CANVAS_ITEM(desktop->acetate);
432 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
433 GDK_BUTTON_RELEASE_MASK |
434 GDK_POINTER_MOTION_MASK ),
435 NULL, bevent.time);
436 }
438 pen_drag_origin_w = event_w;
439 pen_within_tolerance = true;
441 /* Test whether we hit any anchor. */
442 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
444 switch (pc->mode) {
445 case SP_PEN_CONTEXT_MODE_CLICK:
446 /* In click mode we add point on release */
447 switch (pc->state) {
448 case SP_PEN_CONTEXT_POINT:
449 case SP_PEN_CONTEXT_CONTROL:
450 case SP_PEN_CONTEXT_CLOSE:
451 break;
452 case SP_PEN_CONTEXT_STOP:
453 /* This is allowed, if we just cancelled curve */
454 pc->state = SP_PEN_CONTEXT_POINT;
455 break;
456 default:
457 break;
458 }
459 break;
460 case SP_PEN_CONTEXT_MODE_DRAG:
461 switch (pc->state) {
462 case SP_PEN_CONTEXT_STOP:
463 /* This is allowed, if we just cancelled curve */
464 case SP_PEN_CONTEXT_POINT:
465 if (pc->npoints == 0) {
467 if (bevent.state & GDK_CONTROL_MASK) {
468 spdc_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
469 ret = TRUE;
470 break;
471 }
473 // TODO: Perhaps it would be nicer to rearrange the following case
474 // distinction so that the case of a waiting LPE is treated separately
476 /* Set start anchor */
477 pc->sa = anchor;
478 NR::Point p;
479 if (anchor && !sp_pen_context_has_waiting_LPE(pc)) {
480 /* Adjust point to anchor if needed; if we have a waiting LPE, we need
481 a fresh path to be created so don't continue an existing one */
482 p = anchor->dp;
483 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
484 } else {
485 // This is the first click of a new curve; deselect item so that
486 // this curve is not combined with it (unless it is drawn from its
487 // anchor, which is handled by the sibling branch above)
488 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
489 if (!(bevent.state & GDK_SHIFT_MASK) || sp_pen_context_has_waiting_LPE(pc)) {
490 /* if we have a waiting LPE, we need a fresh path to be created
491 so don't append to an existing one */
492 selection->clear();
493 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
494 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
495 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
496 }
498 /* Create green anchor */
499 p = event_dt;
500 if (!pc->polylines_paraxial) {
501 // only snap the starting point if we're not in horizontal/vertical mode
502 // because otherwise it gets shifted; TODO: why do we snap here at all??
503 spdc_endpoint_snap(pc, p, bevent.state);
504 }
505 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
506 }
507 spdc_pen_set_initial_point(pc, p);
508 } else {
510 /* Set end anchor */
511 pc->ea = anchor;
512 NR::Point p;
513 if (anchor) {
514 p = anchor->dp;
515 // we hit an anchor, will finish the curve (either with or without closing)
516 // in release handler
517 pc->state = SP_PEN_CONTEXT_CLOSE;
519 if (pc->green_anchor && pc->green_anchor->active) {
520 // we clicked on the current curve start, so close it even if
521 // we drag a handle away from it
522 dc->green_closed = TRUE;
523 }
524 ret = TRUE;
525 break;
527 } else {
528 p = event_dt;
529 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
530 spdc_pen_set_subsequent_point(pc, p, true);
531 if (pc->polylines_only) {
532 spdc_pen_finish_segment(pc, p, bevent.state);
533 }
534 }
535 }
537 pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
538 ret = TRUE;
539 break;
540 case SP_PEN_CONTEXT_CONTROL:
541 g_warning("Button down in CONTROL state");
542 break;
543 case SP_PEN_CONTEXT_CLOSE:
544 g_warning("Button down in CLOSE state");
545 break;
546 default:
547 break;
548 }
549 break;
550 default:
551 break;
552 }
553 } else if (bevent.button == 3 || pc->expecting_clicks_for_LPE == 1) { // when the last click for a waiting LPE occurs we want to finish the path
554 if (pc->npoints != 0) {
556 spdc_pen_finish_segment(pc, event_dt, bevent.state);
557 if (pc->green_closed) {
558 // finishing at the start anchor, close curve
559 spdc_pen_finish(pc, TRUE);
560 } else {
561 // finishing at some other anchor, finish curve but not close
562 spdc_pen_finish(pc, FALSE);
563 }
565 ret = TRUE;
566 }
567 }
569 if (pc->expecting_clicks_for_LPE > 0) {
570 --pc->expecting_clicks_for_LPE;
571 }
573 return ret;
574 }
576 /**
577 * Handle motion_notify event.
578 */
579 static gint
580 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
581 {
582 gint ret = FALSE;
584 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
585 SPDesktop * const dt = SP_EVENT_CONTEXT_DESKTOP(event_context);
587 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
588 // allow scrolling
589 return FALSE;
590 }
592 if (pc->events_disabled) {
593 // skip motion events if pen events are disabled
594 return FALSE;
595 }
597 NR::Point const event_w(mevent.x,
598 mevent.y);
599 if (pen_within_tolerance) {
600 gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
601 "value", 0, 0, 100);
602 if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
603 return FALSE; // Do not drag if we're within tolerance from origin.
604 }
605 }
606 // Once the user has moved farther than tolerance from the original location
607 // (indicating they intend to move the object, not click), then always process the
608 // motion notify coordinates as given (no snapping back to origin)
609 pen_within_tolerance = false;
611 /* Find desktop coordinates */
612 NR::Point p = dt->w2d(event_w);
614 /* Test, whether we hit any anchor */
615 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
617 switch (pc->mode) {
618 case SP_PEN_CONTEXT_MODE_CLICK:
619 switch (pc->state) {
620 case SP_PEN_CONTEXT_POINT:
621 if ( pc->npoints != 0 ) {
622 /* Only set point, if we are already appending */
623 spdc_endpoint_snap(pc, p, mevent.state);
624 spdc_pen_set_subsequent_point(pc, p, true);
625 ret = TRUE;
626 }
627 break;
628 case SP_PEN_CONTEXT_CONTROL:
629 case SP_PEN_CONTEXT_CLOSE:
630 /* Placing controls is last operation in CLOSE state */
631 spdc_endpoint_snap(pc, p, mevent.state);
632 spdc_pen_set_ctrl(pc, p, mevent.state);
633 ret = TRUE;
634 break;
635 case SP_PEN_CONTEXT_STOP:
636 /* This is perfectly valid */
637 break;
638 default:
639 break;
640 }
641 break;
642 case SP_PEN_CONTEXT_MODE_DRAG:
643 switch (pc->state) {
644 case SP_PEN_CONTEXT_POINT:
645 if ( pc->npoints > 0 ) {
646 /* Only set point, if we are already appending */
648 if (!anchor) { /* Snap node only if not hitting anchor */
649 spdc_endpoint_snap(pc, p, mevent.state);
650 }
652 spdc_pen_set_subsequent_point(pc, p, !anchor, mevent.state);
654 if (anchor && !pc->anchor_statusbar) {
655 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
656 pc->anchor_statusbar = true;
657 } else if (!anchor && pc->anchor_statusbar) {
658 pc->_message_context->clear();
659 pc->anchor_statusbar = false;
660 }
662 ret = TRUE;
663 } else {
664 if (anchor && !pc->anchor_statusbar) {
665 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
666 pc->anchor_statusbar = true;
667 } else if (!anchor && pc->anchor_statusbar) {
668 pc->_message_context->clear();
669 pc->anchor_statusbar = false;
670 }
671 }
672 break;
673 case SP_PEN_CONTEXT_CONTROL:
674 case SP_PEN_CONTEXT_CLOSE:
675 /* Placing controls is last operation in CLOSE state */
677 // snap the handle
678 spdc_endpoint_snap_handle(pc, p, mevent.state);
680 if (!pc->polylines_only) {
681 spdc_pen_set_ctrl(pc, p, mevent.state);
682 } else {
683 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
684 }
685 gobble_motion_events(GDK_BUTTON1_MASK);
686 ret = TRUE;
687 break;
688 case SP_PEN_CONTEXT_STOP:
689 /* This is perfectly valid */
690 break;
691 default:
692 break;
693 }
694 break;
695 default:
696 break;
697 }
698 return ret;
699 }
701 /**
702 * Handle mouse button release event.
703 */
704 static gint
705 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
706 {
707 if (pc->events_disabled) {
708 // skip event processing if events are disabled
709 return FALSE;
710 }
712 gint ret = FALSE;
713 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
714 if ( revent.button == 1 && !event_context->space_panning) {
716 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
718 NR::Point const event_w(revent.x,
719 revent.y);
720 /* Find desktop coordinates */
721 NR::Point p = pc->desktop->w2d(event_w);
723 /* Test whether we hit any anchor. */
724 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
726 switch (pc->mode) {
727 case SP_PEN_CONTEXT_MODE_CLICK:
728 switch (pc->state) {
729 case SP_PEN_CONTEXT_POINT:
730 if ( pc->npoints == 0 ) {
731 /* Start new thread only with button release */
732 if (anchor) {
733 p = anchor->dp;
734 }
735 pc->sa = anchor;
736 spdc_pen_set_initial_point(pc, p);
737 } else {
738 /* Set end anchor here */
739 pc->ea = anchor;
740 if (anchor) {
741 p = anchor->dp;
742 }
743 }
744 pc->state = SP_PEN_CONTEXT_CONTROL;
745 ret = TRUE;
746 break;
747 case SP_PEN_CONTEXT_CONTROL:
748 /* End current segment */
749 spdc_endpoint_snap(pc, p, revent.state);
750 spdc_pen_finish_segment(pc, p, revent.state);
751 pc->state = SP_PEN_CONTEXT_POINT;
752 ret = TRUE;
753 break;
754 case SP_PEN_CONTEXT_CLOSE:
755 /* End current segment */
756 if (!anchor) { /* Snap node only if not hitting anchor */
757 spdc_endpoint_snap(pc, p, revent.state);
758 }
759 spdc_pen_finish_segment(pc, p, revent.state);
760 spdc_pen_finish(pc, TRUE);
761 pc->state = SP_PEN_CONTEXT_POINT;
762 ret = TRUE;
763 break;
764 case SP_PEN_CONTEXT_STOP:
765 /* This is allowed, if we just cancelled curve */
766 pc->state = SP_PEN_CONTEXT_POINT;
767 ret = TRUE;
768 break;
769 default:
770 break;
771 }
772 break;
773 case SP_PEN_CONTEXT_MODE_DRAG:
774 switch (pc->state) {
775 case SP_PEN_CONTEXT_POINT:
776 case SP_PEN_CONTEXT_CONTROL:
777 if (!pc->polylines_only) {
778 spdc_endpoint_snap(pc, p, revent.state);
779 spdc_pen_finish_segment(pc, p, revent.state);
780 }
781 break;
782 case SP_PEN_CONTEXT_CLOSE:
783 spdc_endpoint_snap(pc, p, revent.state);
784 spdc_pen_finish_segment(pc, p, revent.state);
785 if (pc->green_closed) {
786 // finishing at the start anchor, close curve
787 spdc_pen_finish(pc, TRUE);
788 } else {
789 // finishing at some other anchor, finish curve but not close
790 spdc_pen_finish(pc, FALSE);
791 }
792 break;
793 case SP_PEN_CONTEXT_STOP:
794 /* This is allowed, if we just cancelled curve */
795 break;
796 default:
797 break;
798 }
799 pc->state = SP_PEN_CONTEXT_POINT;
800 ret = TRUE;
801 break;
802 default:
803 break;
804 }
806 if (pc->grab) {
807 /* Release grab now */
808 sp_canvas_item_ungrab(pc->grab, revent.time);
809 pc->grab = NULL;
810 }
812 ret = TRUE;
814 dc->green_closed = FALSE;
815 }
817 // TODO: can we be sure that the path was created correctly?
818 // TODO: should we offer an option to collect the clicks in a list?
819 if (pc->expecting_clicks_for_LPE == 0 && sp_pen_context_has_waiting_LPE(pc)) {
820 sp_pen_context_set_polyline_mode(pc);
822 SPEventContext *ec = SP_EVENT_CONTEXT(pc);
823 Inkscape::Selection *selection = sp_desktop_selection (ec->desktop);
825 if (pc->waiting_LPE) {
826 // we have an already created LPE waiting for a path
827 pc->waiting_LPE->acceptParamPath(SP_PATH(selection->singleItem()));
828 selection->add(SP_OBJECT(pc->waiting_item));
829 pc->waiting_LPE = NULL;
830 } else {
831 // the case that we need to create a new LPE and apply it to the just-drawn path is
832 // handled in spdc_check_for_and_apply_waiting_LPE() in draw-context.cpp
833 }
834 }
836 return ret;
837 }
839 static gint
840 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
841 {
842 gint ret = FALSE;
843 if (pc->npoints != 0 && bevent.button != 2) {
844 spdc_pen_finish(pc, FALSE);
845 ret = TRUE;
846 }
847 return ret;
848 }
850 void
851 pen_redraw_all (SPPenContext *const pc)
852 {
853 // green
854 if (pc->green_bpaths) {
855 // remove old piecewise green canvasitems
856 while (pc->green_bpaths) {
857 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
858 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
859 }
860 // one canvas bpath for all of green_curve
861 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
862 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
863 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
865 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
866 }
868 if (pc->green_anchor)
869 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
871 pc->red_curve->reset();
872 pc->red_curve->moveto(pc->p[0]);
873 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
874 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
876 // handles
877 if (pc->p[0] != pc->p[1]) {
878 SP_CTRL(pc->c1)->moveto(pc->p[1]);
879 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
880 sp_canvas_item_show (pc->c1);
881 sp_canvas_item_show (pc->cl1);
882 } else {
883 sp_canvas_item_hide (pc->c1);
884 sp_canvas_item_hide (pc->cl1);
885 }
887 Geom::Curve const * last_seg = pc->green_curve->last_segment();
888 if (last_seg) {
889 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( last_seg );
890 if ( cubic &&
891 (*cubic)[2] != to_2geom(pc->p[0]) )
892 {
893 NR::Point p2 = (*cubic)[2];
894 SP_CTRL(pc->c0)->moveto(p2);
895 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), p2, pc->p[0]);
896 sp_canvas_item_show (pc->c0);
897 sp_canvas_item_show (pc->cl0);
898 } else {
899 sp_canvas_item_hide (pc->c0);
900 sp_canvas_item_hide (pc->cl0);
901 }
902 }
903 }
905 void
906 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
907 {
908 if (pc->npoints != 5)
909 return;
911 // green
912 if (!pc->green_curve->is_empty()) {
913 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
914 } else {
915 // start anchor too
916 if (pc->green_anchor) {
917 pc->green_anchor->dp += NR::Point(x, y);
918 }
919 }
921 // red
922 pc->p[0] += NR::Point(x, y);
923 pc->p[1] += NR::Point(x, y);
924 pen_redraw_all(pc);
925 }
927 void
928 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
929 {
930 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
931 }
933 void
934 pen_lastpoint_tocurve (SPPenContext *const pc)
935 {
936 if (pc->npoints != 5)
937 return;
939 Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>( pc->green_curve->last_segment() );
940 if ( cubic ) {
941 pc->p[1] = pc->p[0] + (NR::Point)( (*cubic)[3] - (*cubic)[2] );
942 } else {
943 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
944 }
946 pen_redraw_all(pc);
947 }
949 void
950 pen_lastpoint_toline (SPPenContext *const pc)
951 {
952 if (pc->npoints != 5)
953 return;
955 pc->p[1] = pc->p[0];
957 pen_redraw_all(pc);
958 }
961 static gint
962 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
963 {
964 gint ret = FALSE;
965 gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
967 switch (get_group0_keyval (&event->key)) {
969 case GDK_Left: // move last point left
970 case GDK_KP_Left:
971 case GDK_KP_4:
972 if (!MOD__CTRL) { // not ctrl
973 if (MOD__ALT) { // alt
974 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
975 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
976 }
977 else { // no alt
978 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
979 else pen_lastpoint_move(pc, -nudge, 0); // no shift
980 }
981 ret = TRUE;
982 }
983 break;
984 case GDK_Up: // move last point up
985 case GDK_KP_Up:
986 case GDK_KP_8:
987 if (!MOD__CTRL) { // not ctrl
988 if (MOD__ALT) { // alt
989 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
990 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
991 }
992 else { // no alt
993 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
994 else pen_lastpoint_move(pc, 0, nudge); // no shift
995 }
996 ret = TRUE;
997 }
998 break;
999 case GDK_Right: // move last point right
1000 case GDK_KP_Right:
1001 case GDK_KP_6:
1002 if (!MOD__CTRL) { // not ctrl
1003 if (MOD__ALT) { // alt
1004 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
1005 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
1006 }
1007 else { // no alt
1008 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
1009 else pen_lastpoint_move(pc, nudge, 0); // no shift
1010 }
1011 ret = TRUE;
1012 }
1013 break;
1014 case GDK_Down: // move last point down
1015 case GDK_KP_Down:
1016 case GDK_KP_2:
1017 if (!MOD__CTRL) { // not ctrl
1018 if (MOD__ALT) { // alt
1019 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
1020 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
1021 }
1022 else { // no alt
1023 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
1024 else pen_lastpoint_move(pc, 0, -nudge); // no shift
1025 }
1026 ret = TRUE;
1027 }
1028 break;
1030 case GDK_P:
1031 case GDK_p:
1032 if (MOD__SHIFT_ONLY) {
1033 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PARALLEL, 2);
1034 ret = TRUE;
1035 }
1036 break;
1038 case GDK_C:
1039 case GDK_c:
1040 if (MOD__SHIFT_ONLY) {
1041 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::CIRCLE_3PTS, 3);
1042 ret = TRUE;
1043 }
1044 break;
1046 case GDK_B:
1047 case GDK_b:
1048 if (MOD__SHIFT_ONLY) {
1049 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::PERP_BISECTOR, 2);
1050 ret = TRUE;
1051 }
1052 break;
1054 case GDK_A:
1055 case GDK_a:
1056 if (MOD__SHIFT_ONLY) {
1057 sp_pen_context_wait_for_LPE_mouse_clicks(pc, Inkscape::LivePathEffect::ANGLE_BISECTOR, 3);
1058 ret = TRUE;
1059 }
1060 break;
1062 case GDK_U:
1063 case GDK_u:
1064 if (MOD__SHIFT_ONLY) {
1065 pen_lastpoint_tocurve(pc);
1066 ret = TRUE;
1067 }
1068 break;
1069 case GDK_L:
1070 case GDK_l:
1071 if (MOD__SHIFT_ONLY) {
1072 pen_lastpoint_toline(pc);
1073 ret = TRUE;
1074 }
1075 break;
1077 case GDK_Return:
1078 case GDK_KP_Enter:
1079 if (pc->npoints != 0) {
1080 spdc_pen_finish(pc, FALSE);
1081 ret = TRUE;
1082 }
1083 break;
1084 case GDK_Escape:
1085 if (pc->npoints != 0) {
1086 // if drawing, cancel, otherwise pass it up for deselecting
1087 pen_cancel (pc);
1088 ret = TRUE;
1089 }
1090 break;
1091 case GDK_z:
1092 case GDK_Z:
1093 if (MOD__CTRL_ONLY && pc->npoints != 0) {
1094 // if drawing, cancel, otherwise pass it up for undo
1095 pen_cancel (pc);
1096 ret = TRUE;
1097 }
1098 break;
1099 case GDK_g:
1100 case GDK_G:
1101 if (MOD__SHIFT_ONLY) {
1102 sp_selection_to_guides(SP_EVENT_CONTEXT(pc)->desktop);
1103 ret = true;
1104 }
1105 break;
1106 case GDK_BackSpace:
1107 case GDK_Delete:
1108 case GDK_KP_Delete:
1109 if (pc->green_curve->is_empty()) {
1110 if (!pc->red_curve->is_empty()) {
1111 pen_cancel (pc);
1112 ret = TRUE;
1113 } else {
1114 // do nothing; this event should be handled upstream
1115 }
1116 } else {
1117 /* Reset red curve */
1118 pc->red_curve->reset();
1119 /* Destroy topmost green bpath */
1120 if (pc->green_bpaths) {
1121 if (pc->green_bpaths->data)
1122 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1123 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1124 }
1125 /* Get last segment */
1126 if ( pc->green_curve->is_empty() ) {
1127 g_warning("pen_handle_key_press, case GDK_KP_Delete: Green curve is empty");
1128 break;
1129 }
1130 // The code below assumes that pc->green_curve has only ONE path !
1131 Geom::Path const & path = pc->green_curve->get_pathvector().back();
1132 Geom::Curve const * crv = &path.back_default();
1133 pc->p[0] = crv->initialPoint();
1134 if ( Geom::CubicBezier const * cubic = dynamic_cast<Geom::CubicBezier const *>(crv)) {
1135 pc->p[1] = (*cubic)[1];
1136 } else {
1137 pc->p[1] = pc->p[0];
1138 }
1139 NR::Point const pt(( pc->npoints < 4
1140 ? (NR::Point)(crv->finalPoint())
1141 : pc->p[3] ));
1142 pc->npoints = 2;
1143 pc->green_curve->backspace();
1144 sp_canvas_item_hide(pc->c0);
1145 sp_canvas_item_hide(pc->c1);
1146 sp_canvas_item_hide(pc->cl0);
1147 sp_canvas_item_hide(pc->cl1);
1148 pc->state = SP_PEN_CONTEXT_POINT;
1149 spdc_pen_set_subsequent_point(pc, pt, true);
1150 ret = TRUE;
1151 }
1152 break;
1153 default:
1154 break;
1155 }
1156 return ret;
1157 }
1159 static void
1160 spdc_reset_colors(SPPenContext *pc)
1161 {
1162 /* Red */
1163 pc->red_curve->reset();
1164 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1165 /* Blue */
1166 pc->blue_curve->reset();
1167 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1168 /* Green */
1169 while (pc->green_bpaths) {
1170 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1171 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1172 }
1173 pc->green_curve->reset();
1174 if (pc->green_anchor) {
1175 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1176 }
1177 pc->sa = NULL;
1178 pc->ea = NULL;
1179 pc->npoints = 0;
1180 pc->red_curve_is_valid = false;
1181 }
1184 static void
1185 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1186 {
1187 g_assert( pc->npoints == 0 );
1189 pc->p[0] = p;
1190 pc->p[1] = p;
1191 pc->npoints = 2;
1192 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1194 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1195 }
1197 /**
1198 * Show the status message for the current line/curve segment.
1199 * This type of message always shows angle/distance as the last
1200 * two parameters ("angle %3.2f°, distance %s").
1201 */
1202 static void
1203 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1204 {
1205 g_assert(pc != NULL);
1206 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1207 g_assert(message != NULL);
1209 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1210 NR::Point rel = p - pc->p[pc_point_to_compare];
1211 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1212 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1213 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1214 angle = angle_to_compass (angle);
1216 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1217 g_string_free(dist, FALSE);
1218 }
1220 static void
1221 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar, guint status)
1222 {
1223 g_assert( pc->npoints != 0 );
1224 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1226 pc->p[2] = p;
1227 pc->p[3] = p;
1228 pc->p[4] = p;
1229 pc->npoints = 5;
1230 pc->red_curve->reset();
1231 bool is_curve;
1232 pc->red_curve->moveto(pc->p[0]);
1233 if (pc->polylines_paraxial && !statusbar) {
1234 // we are drawing horizontal/vertical lines and hit an anchor; draw an L-shaped path
1235 NR::Point intermed = p;
1236 pen_set_to_nearest_horiz_vert(pc, intermed, status);
1237 pc->red_curve->lineto(intermed);
1238 pc->red_curve->lineto(p);
1239 is_curve = false;
1240 } else {
1241 // one of the 'regular' modes
1242 if (pc->p[1] != pc->p[0])
1243 {
1244 pc->red_curve->curveto(pc->p[1], p, p);
1245 is_curve = true;
1246 } else {
1247 pc->red_curve->lineto(p);
1248 is_curve = false;
1249 }
1250 }
1252 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1254 if (statusbar) {
1255 gchar *message = is_curve ?
1256 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1257 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1258 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1259 }
1260 }
1262 static void
1263 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1264 {
1265 sp_canvas_item_show(pc->c1);
1266 sp_canvas_item_show(pc->cl1);
1268 if ( pc->npoints == 2 ) {
1269 pc->p[1] = p;
1270 sp_canvas_item_hide(pc->c0);
1271 sp_canvas_item_hide(pc->cl0);
1272 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1273 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1275 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"));
1276 } else if ( pc->npoints == 5 ) {
1277 pc->p[4] = p;
1278 sp_canvas_item_show(pc->c0);
1279 sp_canvas_item_show(pc->cl0);
1280 bool is_symm = false;
1281 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1282 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1283 NR::Point delta = p - pc->p[3];
1284 pc->p[2] = pc->p[3] - delta;
1285 is_symm = true;
1286 pc->red_curve->reset();
1287 pc->red_curve->moveto(pc->p[0]);
1288 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1289 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1290 }
1291 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1292 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1293 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1294 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1296 gchar *message = is_symm ?
1297 _("<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") :
1298 _("<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");
1299 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1300 } else {
1301 g_warning("Something bad happened - npoints is %d", pc->npoints);
1302 }
1303 }
1305 static void
1306 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1307 {
1308 if (pc->polylines_paraxial) {
1309 pen_last_paraxial_dir = pen_next_paraxial_direction(pc, p, pc->p[0], state);
1310 }
1311 ++pc->num_clicks;
1313 if (!pc->red_curve->is_empty()) {
1314 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1315 SPCurve *curve = pc->red_curve->copy();
1316 /// \todo fixme:
1317 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1318 curve->unref();
1319 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1321 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1323 pc->p[0] = pc->p[3];
1324 pc->p[1] = pc->p[4];
1325 pc->npoints = 2;
1327 pc->red_curve->reset();
1328 }
1329 }
1331 static void
1332 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1333 {
1334 if (pc->expecting_clicks_for_LPE > 1) {
1335 // don't let the path be finished before we have collected the required number of mouse clicks
1336 return;
1337 }
1339 pc->num_clicks = 0;
1341 pen_disable_events(pc);
1343 SPDesktop *const desktop = pc->desktop;
1344 pc->_message_context->clear();
1345 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1347 pc->red_curve->reset();
1348 spdc_concat_colors_and_flush(pc, closed);
1349 pc->sa = NULL;
1350 pc->ea = NULL;
1352 pc->npoints = 0;
1353 pc->state = SP_PEN_CONTEXT_POINT;
1355 sp_canvas_item_hide(pc->c0);
1356 sp_canvas_item_hide(pc->c1);
1357 sp_canvas_item_hide(pc->cl0);
1358 sp_canvas_item_hide(pc->cl1);
1360 if (pc->green_anchor) {
1361 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1362 }
1365 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1367 pen_enable_events(pc);
1368 }
1370 static void
1371 pen_disable_events(SPPenContext *const pc) {
1372 pc->events_disabled++;
1373 }
1375 static void
1376 pen_enable_events(SPPenContext *const pc) {
1377 g_return_if_fail(pc->events_disabled != 0);
1379 pc->events_disabled--;
1380 }
1382 void
1383 sp_pen_context_wait_for_LPE_mouse_clicks(SPPenContext *pc, Inkscape::LivePathEffect::EffectType effect_type,
1384 unsigned int num_clicks, bool use_polylines)
1385 {
1386 if (effect_type == Inkscape::LivePathEffect::INVALID_LPE)
1387 return;
1389 pc->waiting_LPE_type = effect_type;
1390 pc->expecting_clicks_for_LPE = num_clicks;
1391 pc->polylines_only = use_polylines;
1392 pc->polylines_paraxial = false; // TODO: think if this is correct for all cases
1393 }
1395 void
1396 sp_pen_context_cancel_waiting_for_LPE(SPPenContext *pc)
1397 {
1398 pc->waiting_LPE_type = Inkscape::LivePathEffect::INVALID_LPE;
1399 pc->expecting_clicks_for_LPE = 0;
1400 sp_pen_context_set_polyline_mode(pc);
1401 }
1403 static int pen_next_paraxial_direction(const SPPenContext *const pc,
1404 NR::Point const &pt, NR::Point const &origin, guint state) {
1405 /*
1406 * after the first mouse click we determine whether the mouse pointer is closest to a
1407 * horizontal or vertical segment; for all subsequent mouse clicks, we use the direction
1408 * orthogonal to the last one; pressing Shift toggles the direction
1409 */
1410 if (pc->num_clicks == 0) {
1411 // first mouse click
1412 double dist_h = fabs(pt[NR::X] - origin[NR::X]);
1413 double dist_v = fabs(pt[NR::Y] - origin[NR::Y]);
1414 int ret = (dist_h < dist_v) ? 1 : 0; // 0 = horizontal, 1 = vertical
1415 pen_last_paraxial_dir = (state & GDK_SHIFT_MASK) ? 1 - ret : ret;
1416 return pen_last_paraxial_dir;
1417 } else {
1418 // subsequent mouse click
1419 return (state & GDK_SHIFT_MASK) ? pen_last_paraxial_dir : 1 - pen_last_paraxial_dir;
1420 }
1421 }
1423 void pen_set_to_nearest_horiz_vert(const SPPenContext *const pc, NR::Point &pt, guint const state)
1424 {
1425 NR::Point const &origin = pc->p[0];
1427 int next_dir = pen_next_paraxial_direction(pc, pt, origin, state);
1429 if (next_dir == 0) {
1430 // line is forced to be horizontal
1431 pt[NR::Y] = origin[NR::Y];
1432 } else {
1433 // line is forced to be vertical
1434 pt[NR::X] = origin[NR::X];
1435 }
1436 }
1438 NR::Point pen_get_intermediate_horiz_vert(const SPPenContext *const pc, NR::Point const &pt)
1439 {
1440 NR::Point const &origin = pc->p[0];
1442 if (pen_last_paraxial_dir == 0) {
1443 return NR::Point (origin[NR::X], pt[NR::Y]);
1444 } else {
1445 return NR::Point (pt[NR::X], origin[NR::Y]);
1446 }
1447 }
1449 /*
1450 Local Variables:
1451 mode:c++
1452 c-file-style:"stroustrup"
1453 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1454 indent-tabs-mode:nil
1455 fill-column:99
1456 End:
1457 */
1458 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :