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>
20 #include "pen-context.h"
21 #include "sp-namedview.h"
22 #include "sp-metrics.h"
23 #include "desktop.h"
24 #include "desktop-handles.h"
25 #include "selection.h"
26 #include "draw-anchor.h"
27 #include "message-stack.h"
28 #include "message-context.h"
29 #include "prefs-utils.h"
30 #include "sp-path.h"
32 #include "pixmaps/cursor-pen.xpm"
33 #include "display/canvas-bpath.h"
34 #include "display/sp-ctrlline.h"
35 #include "display/sodipodi-ctrl.h"
36 #include <glibmm/i18n.h>
37 #include "libnr/n-art-bpath.h"
38 #include "helper/units.h"
39 #include "macros.h"
40 #include "context-fns.h"
43 static void sp_pen_context_class_init(SPPenContextClass *klass);
44 static void sp_pen_context_init(SPPenContext *pc);
45 static void sp_pen_context_dispose(GObject *object);
47 static void sp_pen_context_setup(SPEventContext *ec);
48 static void sp_pen_context_finish(SPEventContext *ec);
49 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
50 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
51 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
53 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
54 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
55 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
56 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
58 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
60 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
61 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
62 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
63 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
64 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
65 static void spdc_reset_colors(SPPenContext *pc);
67 static void pen_disable_events(SPPenContext *const pc);
68 static void pen_enable_events(SPPenContext *const pc);
70 static NR::Point pen_drag_origin_w(0, 0);
71 static bool pen_within_tolerance = false;
73 static SPDrawContextClass *pen_parent_class;
75 /**
76 * Register SPPenContext with Gdk and return its type.
77 */
78 GType
79 sp_pen_context_get_type(void)
80 {
81 static GType type = 0;
82 if (!type) {
83 GTypeInfo info = {
84 sizeof(SPPenContextClass),
85 NULL, NULL,
86 (GClassInitFunc) sp_pen_context_class_init,
87 NULL, NULL,
88 sizeof(SPPenContext),
89 4,
90 (GInstanceInitFunc) sp_pen_context_init,
91 NULL, /* value_table */
92 };
93 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
94 }
95 return type;
96 }
98 /**
99 * Initialize the SPPenContext vtable.
100 */
101 static void
102 sp_pen_context_class_init(SPPenContextClass *klass)
103 {
104 GObjectClass *object_class;
105 SPEventContextClass *event_context_class;
107 object_class = (GObjectClass *) klass;
108 event_context_class = (SPEventContextClass *) klass;
110 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
112 object_class->dispose = sp_pen_context_dispose;
114 event_context_class->setup = sp_pen_context_setup;
115 event_context_class->finish = sp_pen_context_finish;
116 event_context_class->set = sp_pen_context_set;
117 event_context_class->root_handler = sp_pen_context_root_handler;
118 event_context_class->item_handler = sp_pen_context_item_handler;
119 }
121 /**
122 * Callback to initialize SPPenContext object.
123 */
124 static void
125 sp_pen_context_init(SPPenContext *pc)
126 {
128 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
130 event_context->cursor_shape = cursor_pen_xpm;
131 event_context->hot_x = 4;
132 event_context->hot_y = 4;
134 pc->npoints = 0;
135 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
136 pc->state = SP_PEN_CONTEXT_POINT;
138 pc->c0 = NULL;
139 pc->c1 = NULL;
140 pc->cl0 = NULL;
141 pc->cl1 = NULL;
143 pc->events_disabled = 0;
144 }
146 /**
147 * Callback to destroy the SPPenContext object's members and itself.
148 */
149 static void
150 sp_pen_context_dispose(GObject *object)
151 {
152 SPPenContext *pc;
154 pc = SP_PEN_CONTEXT(object);
156 if (pc->c0) {
157 gtk_object_destroy(GTK_OBJECT(pc->c0));
158 pc->c0 = NULL;
159 }
160 if (pc->c1) {
161 gtk_object_destroy(GTK_OBJECT(pc->c1));
162 pc->c1 = NULL;
163 }
164 if (pc->cl0) {
165 gtk_object_destroy(GTK_OBJECT(pc->cl0));
166 pc->cl0 = NULL;
167 }
168 if (pc->cl1) {
169 gtk_object_destroy(GTK_OBJECT(pc->cl1));
170 pc->cl1 = NULL;
171 }
173 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
174 }
176 /**
177 * Callback to initialize SPPenContext object.
178 */
179 static void
180 sp_pen_context_setup(SPEventContext *ec)
181 {
182 SPPenContext *pc;
184 pc = SP_PEN_CONTEXT(ec);
186 if (((SPEventContextClass *) pen_parent_class)->setup) {
187 ((SPEventContextClass *) pen_parent_class)->setup(ec);
188 }
190 /* Pen indicators */
191 pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
192 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
193 pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
194 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
195 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
196 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
197 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
198 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
200 sp_canvas_item_hide(pc->c0);
201 sp_canvas_item_hide(pc->c1);
202 sp_canvas_item_hide(pc->cl0);
203 sp_canvas_item_hide(pc->cl1);
205 sp_event_context_read(ec, "mode");
207 pc->anchor_statusbar = false;
209 if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
210 ec->enableSelectionCue();
211 }
212 }
214 static void
215 pen_cancel (SPPenContext *const pc)
216 {
217 pc->state = SP_PEN_CONTEXT_STOP;
218 spdc_reset_colors(pc);
219 sp_canvas_item_hide(pc->c0);
220 sp_canvas_item_hide(pc->c1);
221 sp_canvas_item_hide(pc->cl0);
222 sp_canvas_item_hide(pc->cl1);
223 pc->_message_context->clear();
224 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
226 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
227 }
229 /**
230 * Finalization callback.
231 */
232 static void
233 sp_pen_context_finish(SPEventContext *ec)
234 {
235 SPPenContext *pc = SP_PEN_CONTEXT(ec);
237 if (pc->npoints != 0) {
238 pen_cancel (pc);
239 }
241 if (((SPEventContextClass *) pen_parent_class)->finish) {
242 ((SPEventContextClass *) pen_parent_class)->finish(ec);
243 }
244 }
246 /**
247 * Callback that sets key to value in pen context.
248 */
249 static void
250 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
251 {
252 SPPenContext *pc = SP_PEN_CONTEXT(ec);
254 if (!strcmp(key, "mode")) {
255 if ( val && !strcmp(val, "drag") ) {
256 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
257 } else {
258 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
259 }
260 }
261 }
263 /**
264 * Snaps new node relative to the previous node.
265 */
266 static void
267 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
268 {
269 if (pc->npoints > 0) {
270 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
271 }
273 spdc_endpoint_snap_free(pc, p, state);
274 }
276 /**
277 * Snaps new node's handle relative to the new node.
278 */
279 static void
280 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
281 {
282 g_return_if_fail(( pc->npoints == 2 ||
283 pc->npoints == 5 ));
285 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
286 spdc_endpoint_snap_free(pc, p, state);
287 }
289 static gint
290 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
291 {
292 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
294 gint ret = FALSE;
296 switch (event->type) {
297 case GDK_BUTTON_PRESS:
298 ret = pen_handle_button_press(pc, event->button);
299 break;
300 default:
301 break;
302 }
304 if (!ret) {
305 if (((SPEventContextClass *) pen_parent_class)->item_handler)
306 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
307 }
309 return ret;
310 }
312 /**
313 * Callback to handle all pen events.
314 */
315 static gint
316 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
317 {
318 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
320 gint ret = FALSE;
322 switch (event->type) {
323 case GDK_BUTTON_PRESS:
324 ret = pen_handle_button_press(pc, event->button);
325 break;
327 case GDK_MOTION_NOTIFY:
328 ret = pen_handle_motion_notify(pc, event->motion);
329 break;
331 case GDK_BUTTON_RELEASE:
332 ret = pen_handle_button_release(pc, event->button);
333 break;
335 case GDK_2BUTTON_PRESS:
336 ret = pen_handle_2button_press(pc, event->button);
337 break;
339 case GDK_KEY_PRESS:
340 ret = pen_handle_key_press(pc, event);
341 break;
343 default:
344 break;
345 }
347 if (!ret) {
348 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
349 = ((SPEventContextClass *) pen_parent_class)->root_handler;
350 if (parent_root_handler) {
351 ret = parent_root_handler(ec, event);
352 }
353 }
355 return ret;
356 }
358 /**
359 * Handle mouse button press event.
360 */
361 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
362 {
363 if (pc->events_disabled) {
364 // skip event processing if events are disabled
365 return FALSE;
366 }
368 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
369 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
370 NR::Point const event_w(bevent.x, bevent.y);
371 NR::Point const event_dt(desktop->w2d(event_w));
372 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
374 gint ret = FALSE;
375 if (bevent.button == 1 && !event_context->space_panning) {
377 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
378 return TRUE;
379 }
381 pen_drag_origin_w = event_w;
382 pen_within_tolerance = true;
384 /* Test whether we hit any anchor. */
385 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
387 switch (pc->mode) {
388 case SP_PEN_CONTEXT_MODE_CLICK:
389 /* In click mode we add point on release */
390 switch (pc->state) {
391 case SP_PEN_CONTEXT_POINT:
392 case SP_PEN_CONTEXT_CONTROL:
393 case SP_PEN_CONTEXT_CLOSE:
394 break;
395 case SP_PEN_CONTEXT_STOP:
396 /* This is allowed, if we just cancelled curve */
397 pc->state = SP_PEN_CONTEXT_POINT;
398 break;
399 default:
400 break;
401 }
402 break;
403 case SP_PEN_CONTEXT_MODE_DRAG:
404 switch (pc->state) {
405 case SP_PEN_CONTEXT_STOP:
406 /* This is allowed, if we just cancelled curve */
407 case SP_PEN_CONTEXT_POINT:
408 if (pc->npoints == 0) {
410 /* Set start anchor */
411 pc->sa = anchor;
412 NR::Point p;
413 if (anchor) {
415 /* Adjust point to anchor if needed */
416 p = anchor->dp;
417 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
419 } else {
421 // This is the first click of a new curve; deselect item so that
422 // this curve is not combined with it (unless it is drawn from its
423 // anchor, which is handled by the sibling branch above)
424 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
425 if (!(bevent.state & GDK_SHIFT_MASK)) {
427 selection->clear();
428 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
430 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
432 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
433 }
435 /* Create green anchor */
436 p = event_dt;
437 spdc_endpoint_snap(pc, p, bevent.state);
438 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
439 }
440 spdc_pen_set_initial_point(pc, p);
441 } else {
443 /* Set end anchor */
444 pc->ea = anchor;
445 NR::Point p;
446 if (anchor) {
448 p = anchor->dp;
449 // we hit an anchor, will finish the curve (either with or without closing)
450 // in release handler
451 pc->state = SP_PEN_CONTEXT_CLOSE;
453 if (pc->green_anchor && pc->green_anchor->active) {
454 // we clicked on the current curve start, so close it even if
455 // we drag a handle away from it
456 dc->green_closed = TRUE;
457 }
458 ret = TRUE;
459 break;
461 } else {
463 p = event_dt;
464 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
465 spdc_pen_set_subsequent_point(pc, p, true);
466 }
468 }
469 pc->state = SP_PEN_CONTEXT_CONTROL;
470 ret = TRUE;
471 break;
472 case SP_PEN_CONTEXT_CONTROL:
473 g_warning("Button down in CONTROL state");
474 break;
475 case SP_PEN_CONTEXT_CLOSE:
476 g_warning("Button down in CLOSE state");
477 break;
478 default:
479 break;
480 }
481 break;
482 default:
483 break;
484 }
485 } else if (bevent.button == 3) {
486 if (pc->npoints != 0) {
488 spdc_pen_finish_segment(pc, event_dt, bevent.state);
489 if (pc->green_closed) {
490 // finishing at the start anchor, close curve
491 spdc_pen_finish(pc, TRUE);
492 } else {
493 // finishing at some other anchor, finish curve but not close
494 spdc_pen_finish(pc, FALSE);
495 }
497 ret = TRUE;
498 }
499 }
501 return ret;
502 }
504 /**
505 * Handle motion_notify event.
506 */
507 static gint
508 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
509 {
510 gint ret = FALSE;
512 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
514 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
515 // allow scrolling
516 return FALSE;
517 }
519 if (pc->events_disabled) {
520 // skip motion events if pen events are disabled
521 return FALSE;
522 }
524 NR::Point const event_w(mevent.x,
525 mevent.y);
526 if (pen_within_tolerance) {
527 gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
528 "value", 0, 0, 100);
529 if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
530 return FALSE; // Do not drag if we're within tolerance from origin.
531 }
532 }
533 // Once the user has moved farther than tolerance from the original location
534 // (indicating they intend to move the object, not click), then always process the
535 // motion notify coordinates as given (no snapping back to origin)
536 pen_within_tolerance = false;
538 SPDesktop *const dt = pc->desktop;
539 if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
540 /* Grab mouse, so release will not pass unnoticed */
541 pc->grab = SP_CANVAS_ITEM(dt->acetate);
542 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
543 GDK_BUTTON_RELEASE_MASK |
544 GDK_POINTER_MOTION_MASK ),
545 NULL, mevent.time);
546 }
548 /* Find desktop coordinates */
549 NR::Point p = dt->w2d(event_w);
551 /* Test, whether we hit any anchor */
552 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
554 switch (pc->mode) {
555 case SP_PEN_CONTEXT_MODE_CLICK:
556 switch (pc->state) {
557 case SP_PEN_CONTEXT_POINT:
558 if ( pc->npoints != 0 ) {
559 /* Only set point, if we are already appending */
560 spdc_endpoint_snap(pc, p, mevent.state);
561 spdc_pen_set_subsequent_point(pc, p, true);
562 ret = TRUE;
563 }
564 break;
565 case SP_PEN_CONTEXT_CONTROL:
566 case SP_PEN_CONTEXT_CLOSE:
567 /* Placing controls is last operation in CLOSE state */
568 spdc_endpoint_snap(pc, p, mevent.state);
569 spdc_pen_set_ctrl(pc, p, mevent.state);
570 ret = TRUE;
571 break;
572 case SP_PEN_CONTEXT_STOP:
573 /* This is perfectly valid */
574 break;
575 default:
576 break;
577 }
578 break;
579 case SP_PEN_CONTEXT_MODE_DRAG:
580 switch (pc->state) {
581 case SP_PEN_CONTEXT_POINT:
582 if ( pc->npoints > 0 ) {
583 /* Only set point, if we are already appending */
585 if (!anchor) { /* Snap node only if not hitting anchor */
586 spdc_endpoint_snap(pc, p, mevent.state);
587 }
589 spdc_pen_set_subsequent_point(pc, p, !anchor);
591 if (anchor && !pc->anchor_statusbar) {
592 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
593 pc->anchor_statusbar = true;
594 } else if (!anchor && pc->anchor_statusbar) {
595 pc->_message_context->clear();
596 pc->anchor_statusbar = false;
597 }
599 ret = TRUE;
600 } else {
601 if (anchor && !pc->anchor_statusbar) {
602 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
603 pc->anchor_statusbar = true;
604 } else if (!anchor && pc->anchor_statusbar) {
605 pc->_message_context->clear();
606 pc->anchor_statusbar = false;
607 }
608 }
609 break;
610 case SP_PEN_CONTEXT_CONTROL:
611 case SP_PEN_CONTEXT_CLOSE:
612 /* Placing controls is last operation in CLOSE state */
614 // snap the handle
615 spdc_endpoint_snap_handle(pc, p, mevent.state);
617 spdc_pen_set_ctrl(pc, p, mevent.state);
618 ret = TRUE;
619 break;
620 case SP_PEN_CONTEXT_STOP:
621 /* This is perfectly valid */
622 break;
623 default:
624 break;
625 }
626 break;
627 default:
628 break;
629 }
630 return ret;
631 }
633 /**
634 * Handle mouse button release event.
635 */
636 static gint
637 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
638 {
639 if (pc->events_disabled) {
640 // skip event processing if events are disabled
641 return FALSE;
642 }
644 gint ret = FALSE;
645 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
646 if ( revent.button == 1 && !event_context->space_panning) {
648 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
650 NR::Point const event_w(revent.x,
651 revent.y);
652 /* Find desktop coordinates */
653 NR::Point p = pc->desktop->w2d(event_w);
655 /* Test whether we hit any anchor. */
656 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
658 switch (pc->mode) {
659 case SP_PEN_CONTEXT_MODE_CLICK:
660 switch (pc->state) {
661 case SP_PEN_CONTEXT_POINT:
662 if ( pc->npoints == 0 ) {
663 /* Start new thread only with button release */
664 if (anchor) {
665 p = anchor->dp;
666 }
667 pc->sa = anchor;
668 spdc_pen_set_initial_point(pc, p);
669 } else {
670 /* Set end anchor here */
671 pc->ea = anchor;
672 if (anchor) {
673 p = anchor->dp;
674 }
675 }
676 pc->state = SP_PEN_CONTEXT_CONTROL;
677 ret = TRUE;
678 break;
679 case SP_PEN_CONTEXT_CONTROL:
680 /* End current segment */
681 spdc_endpoint_snap(pc, p, revent.state);
682 spdc_pen_finish_segment(pc, p, revent.state);
683 pc->state = SP_PEN_CONTEXT_POINT;
684 ret = TRUE;
685 break;
686 case SP_PEN_CONTEXT_CLOSE:
687 /* End current segment */
688 if (!anchor) { /* Snap node only if not hitting anchor */
689 spdc_endpoint_snap(pc, p, revent.state);
690 }
691 spdc_pen_finish_segment(pc, p, revent.state);
692 spdc_pen_finish(pc, TRUE);
693 pc->state = SP_PEN_CONTEXT_POINT;
694 ret = TRUE;
695 break;
696 case SP_PEN_CONTEXT_STOP:
697 /* This is allowed, if we just cancelled curve */
698 pc->state = SP_PEN_CONTEXT_POINT;
699 ret = TRUE;
700 break;
701 default:
702 break;
703 }
704 break;
705 case SP_PEN_CONTEXT_MODE_DRAG:
706 switch (pc->state) {
707 case SP_PEN_CONTEXT_POINT:
708 case SP_PEN_CONTEXT_CONTROL:
709 spdc_endpoint_snap(pc, p, revent.state);
710 spdc_pen_finish_segment(pc, p, revent.state);
711 break;
712 case SP_PEN_CONTEXT_CLOSE:
713 spdc_endpoint_snap(pc, p, revent.state);
714 spdc_pen_finish_segment(pc, p, revent.state);
715 if (pc->green_closed) {
716 // finishing at the start anchor, close curve
717 spdc_pen_finish(pc, TRUE);
718 } else {
719 // finishing at some other anchor, finish curve but not close
720 spdc_pen_finish(pc, FALSE);
721 }
722 break;
723 case SP_PEN_CONTEXT_STOP:
724 /* This is allowed, if we just cancelled curve */
725 break;
726 default:
727 break;
728 }
729 pc->state = SP_PEN_CONTEXT_POINT;
730 ret = TRUE;
731 break;
732 default:
733 break;
734 }
736 if (pc->grab) {
737 /* Release grab now */
738 sp_canvas_item_ungrab(pc->grab, revent.time);
739 pc->grab = NULL;
740 }
742 ret = TRUE;
744 dc->green_closed = FALSE;
745 }
747 return ret;
748 }
750 static gint
751 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
752 {
753 gint ret = FALSE;
754 if (pc->npoints != 0 && bevent.button != 2) {
755 spdc_pen_finish(pc, FALSE);
756 ret = TRUE;
757 }
758 return ret;
759 }
761 void
762 pen_redraw_all (SPPenContext *const pc)
763 {
764 // green
765 if (pc->green_bpaths) {
766 // remove old piecewise green canvasitems
767 while (pc->green_bpaths) {
768 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
769 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
770 }
771 // one canvas bpath for all of green_curve
772 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
773 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
774 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
776 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
777 }
779 if (pc->green_anchor)
780 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
782 sp_curve_reset(pc->red_curve);
783 sp_curve_moveto(pc->red_curve, pc->p[0]);
784 sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
785 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
787 // handles
788 if (pc->p[0] != pc->p[1]) {
789 SP_CTRL(pc->c1)->moveto(pc->p[1]);
790 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
791 sp_canvas_item_show (pc->c1);
792 sp_canvas_item_show (pc->cl1);
793 } else {
794 sp_canvas_item_hide (pc->c1);
795 sp_canvas_item_hide (pc->cl1);
796 }
798 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
799 if (bpath) {
800 if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
801 SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
802 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
803 sp_canvas_item_show (pc->c0);
804 sp_canvas_item_show (pc->cl0);
805 } else {
806 sp_canvas_item_hide (pc->c0);
807 sp_canvas_item_hide (pc->cl0);
808 }
809 }
810 }
812 void
813 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
814 {
815 if (pc->npoints != 5)
816 return;
818 // green
819 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
820 if (bpath) {
821 if (bpath->code == NR_CURVETO) {
822 bpath->x2 += x;
823 bpath->y2 += y;
824 }
825 bpath->x3 += x;
826 bpath->y3 += y;
827 } else {
828 // start anchor too
829 if (pc->green_anchor) {
830 pc->green_anchor->dp += NR::Point(x, y);
831 }
832 }
834 // red
835 pc->p[0] += NR::Point(x, y);
836 pc->p[1] += NR::Point(x, y);
837 pen_redraw_all(pc);
838 }
840 void
841 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
842 {
843 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
844 }
846 void
847 pen_lastpoint_tocurve (SPPenContext *const pc)
848 {
849 if (pc->npoints != 5)
850 return;
852 // red
853 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
854 if (bpath && bpath->code == NR_CURVETO) {
855 pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
856 } else {
857 pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
858 }
860 pen_redraw_all(pc);
861 }
863 void
864 pen_lastpoint_toline (SPPenContext *const pc)
865 {
866 if (pc->npoints != 5)
867 return;
869 pc->p[1] = pc->p[0];
871 pen_redraw_all(pc);
872 }
875 static gint
876 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
877 {
878 gint ret = FALSE;
879 gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
881 switch (get_group0_keyval (&event->key)) {
883 case GDK_Left: // move last point left
884 case GDK_KP_Left:
885 case GDK_KP_4:
886 if (!MOD__CTRL) { // not ctrl
887 if (MOD__ALT) { // alt
888 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
889 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
890 }
891 else { // no alt
892 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
893 else pen_lastpoint_move(pc, -nudge, 0); // no shift
894 }
895 ret = TRUE;
896 }
897 break;
898 case GDK_Up: // move last point up
899 case GDK_KP_Up:
900 case GDK_KP_8:
901 if (!MOD__CTRL) { // not ctrl
902 if (MOD__ALT) { // alt
903 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
904 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
905 }
906 else { // no alt
907 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
908 else pen_lastpoint_move(pc, 0, nudge); // no shift
909 }
910 ret = TRUE;
911 }
912 break;
913 case GDK_Right: // move last point right
914 case GDK_KP_Right:
915 case GDK_KP_6:
916 if (!MOD__CTRL) { // not ctrl
917 if (MOD__ALT) { // alt
918 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
919 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
920 }
921 else { // no alt
922 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
923 else pen_lastpoint_move(pc, nudge, 0); // no shift
924 }
925 ret = TRUE;
926 }
927 break;
928 case GDK_Down: // move last point down
929 case GDK_KP_Down:
930 case GDK_KP_2:
931 if (!MOD__CTRL) { // not ctrl
932 if (MOD__ALT) { // alt
933 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
934 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
935 }
936 else { // no alt
937 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
938 else pen_lastpoint_move(pc, 0, -nudge); // no shift
939 }
940 ret = TRUE;
941 }
942 break;
944 case GDK_U:
945 case GDK_u:
946 if (MOD__SHIFT_ONLY) {
947 pen_lastpoint_tocurve(pc);
948 ret = TRUE;
949 }
950 break;
951 case GDK_L:
952 case GDK_l:
953 if (MOD__SHIFT_ONLY) {
954 pen_lastpoint_toline(pc);
955 ret = TRUE;
956 }
957 break;
959 case GDK_Return:
960 case GDK_KP_Enter:
961 if (pc->npoints != 0) {
962 spdc_pen_finish(pc, FALSE);
963 ret = TRUE;
964 }
965 break;
966 case GDK_Escape:
967 if (pc->npoints != 0) {
968 // if drawing, cancel, otherwise pass it up for deselecting
969 pen_cancel (pc);
970 ret = TRUE;
971 }
972 break;
973 case GDK_z:
974 case GDK_Z:
975 if (MOD__CTRL_ONLY && pc->npoints != 0) {
976 // if drawing, cancel, otherwise pass it up for undo
977 pen_cancel (pc);
978 ret = TRUE;
979 }
980 break;
981 case GDK_BackSpace:
982 case GDK_Delete:
983 case GDK_KP_Delete:
984 if (sp_curve_is_empty(pc->green_curve)) {
985 pen_cancel (pc);
986 ret = TRUE;
987 } else {
988 /* Reset red curve */
989 sp_curve_reset(pc->red_curve);
990 /* Destroy topmost green bpath */
991 if (pc->green_bpaths) {
992 if (pc->green_bpaths->data)
993 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
994 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
995 }
996 /* Get last segment */
997 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
998 gint const e = SP_CURVE_LENGTH(pc->green_curve);
999 if ( e < 2 ) {
1000 g_warning("Green curve length is %d", e);
1001 break;
1002 }
1003 pc->p[0] = p[e - 2].c(3);
1004 if (p[e - 1].code == NR_CURVETO) {
1005 pc->p[1] = p[e - 1].c(1);
1006 } else {
1007 pc->p[1] = pc->p[0];
1008 }
1009 NR::Point const pt(( pc->npoints < 4
1010 ? p[e - 1].c(3)
1011 : pc->p[3] ));
1012 pc->npoints = 2;
1013 sp_curve_backspace(pc->green_curve);
1014 sp_canvas_item_hide(pc->c0);
1015 sp_canvas_item_hide(pc->c1);
1016 sp_canvas_item_hide(pc->cl0);
1017 sp_canvas_item_hide(pc->cl1);
1018 pc->state = SP_PEN_CONTEXT_POINT;
1019 spdc_pen_set_subsequent_point(pc, pt, true);
1020 ret = TRUE;
1021 }
1022 break;
1023 default:
1024 break;
1025 }
1026 return ret;
1027 }
1029 static void
1030 spdc_reset_colors(SPPenContext *pc)
1031 {
1032 /* Red */
1033 sp_curve_reset(pc->red_curve);
1034 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1035 /* Blue */
1036 sp_curve_reset(pc->blue_curve);
1037 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1038 /* Green */
1039 while (pc->green_bpaths) {
1040 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1041 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1042 }
1043 sp_curve_reset(pc->green_curve);
1044 if (pc->green_anchor) {
1045 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1046 }
1047 pc->sa = NULL;
1048 pc->ea = NULL;
1049 pc->npoints = 0;
1050 pc->red_curve_is_valid = false;
1051 }
1054 static void
1055 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1056 {
1057 g_assert( pc->npoints == 0 );
1059 pc->p[0] = p;
1060 pc->p[1] = p;
1061 pc->npoints = 2;
1062 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1064 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1065 }
1067 static void
1068 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1069 {
1070 g_assert( pc->npoints != 0 );
1071 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1073 pc->p[2] = p;
1074 pc->p[3] = p;
1075 pc->p[4] = p;
1076 pc->npoints = 5;
1077 sp_curve_reset(pc->red_curve);
1078 sp_curve_moveto(pc->red_curve, pc->p[0]);
1079 bool is_curve;
1080 if ( (pc->onlycurves)
1081 || ( pc->p[1] != pc->p[0] ) )
1082 {
1083 sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1084 is_curve = true;
1085 } else {
1086 sp_curve_lineto(pc->red_curve, p);
1087 is_curve = false;
1088 }
1090 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1092 if (statusbar) {
1093 // status text
1094 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1095 NR::Point rel = p - pc->p[0];
1096 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1097 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1098 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1099 angle = angle_to_compass (angle);
1100 pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path"), is_curve? "Curve segment" : "Line segment", angle, dist->str);
1101 g_string_free(dist, FALSE);
1102 }
1103 }
1105 static void
1106 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1107 {
1108 sp_canvas_item_show(pc->c1);
1109 sp_canvas_item_show(pc->cl1);
1111 if ( pc->npoints == 2 ) {
1112 pc->p[1] = p;
1113 sp_canvas_item_hide(pc->c0);
1114 sp_canvas_item_hide(pc->cl0);
1115 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1116 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1118 // status text
1119 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1120 NR::Point rel = p - pc->p[0];
1121 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1122 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1123 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1124 angle = angle_to_compass (angle);
1125 pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1126 g_string_free(dist, FALSE);
1128 } else if ( pc->npoints == 5 ) {
1129 pc->p[4] = p;
1130 sp_canvas_item_show(pc->c0);
1131 sp_canvas_item_show(pc->cl0);
1132 bool is_symm = false;
1133 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1134 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1135 NR::Point delta = p - pc->p[3];
1136 pc->p[2] = pc->p[3] - delta;
1137 is_symm = true;
1138 sp_curve_reset(pc->red_curve);
1139 sp_curve_moveto(pc->red_curve, pc->p[0]);
1140 sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1141 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1142 }
1143 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1144 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1145 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1146 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1148 // status text
1149 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1150 NR::Point rel = p - pc->p[3];
1151 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1152 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1153 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1154 angle = angle_to_compass (angle);
1155 pc->_message_context->setF(Inkscape::NORMAL_MESSAGE, _("<b>%s</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle, with <b>Shift</b> to move this handle only"), is_symm? "Curve handle, symmetric" : "Curve handle", angle, dist->str);
1156 g_string_free(dist, FALSE);
1158 } else {
1159 g_warning("Something bad happened - npoints is %d", pc->npoints);
1160 }
1161 }
1163 static void
1164 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const p, guint const state)
1165 {
1166 if (!sp_curve_empty(pc->red_curve)) {
1167 sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1168 SPCurve *curve = sp_curve_copy(pc->red_curve);
1169 /// \todo fixme:
1170 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1171 sp_curve_unref(curve);
1172 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1174 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1176 pc->p[0] = pc->p[3];
1177 pc->p[1] = pc->p[4];
1178 pc->npoints = 2;
1180 sp_curve_reset(pc->red_curve);
1181 }
1182 }
1184 static void
1185 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1186 {
1187 pen_disable_events(pc);
1189 SPDesktop *const desktop = pc->desktop;
1190 pc->_message_context->clear();
1191 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1193 sp_curve_reset(pc->red_curve);
1194 spdc_concat_colors_and_flush(pc, closed);
1195 pc->sa = NULL;
1196 pc->ea = NULL;
1198 pc->npoints = 0;
1199 pc->state = SP_PEN_CONTEXT_POINT;
1201 sp_canvas_item_hide(pc->c0);
1202 sp_canvas_item_hide(pc->c1);
1203 sp_canvas_item_hide(pc->cl0);
1204 sp_canvas_item_hide(pc->cl1);
1206 if (pc->green_anchor) {
1207 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1208 }
1211 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1213 pen_enable_events(pc);
1214 }
1216 static void
1217 pen_disable_events(SPPenContext *const pc) {
1218 pc->events_disabled++;
1219 }
1221 static void
1222 pen_enable_events(SPPenContext *const pc) {
1223 g_return_if_fail(pc->events_disabled != 0);
1225 pc->events_disabled--;
1226 }
1228 /*
1229 Local Variables:
1230 mode:c++
1231 c-file-style:"stroustrup"
1232 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1233 indent-tabs-mode:nil
1234 fill-column:99
1235 End:
1236 */
1237 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :