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"
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/n-art-bpath.h"
41 #include "helper/units.h"
42 #include "macros.h"
43 #include "context-fns.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 *pc, NR::Point const p, bool statusbar);
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 /**
79 * Register SPPenContext with Gdk and return its type.
80 */
81 GType
82 sp_pen_context_get_type(void)
83 {
84 static GType type = 0;
85 if (!type) {
86 GTypeInfo info = {
87 sizeof(SPPenContextClass),
88 NULL, NULL,
89 (GClassInitFunc) sp_pen_context_class_init,
90 NULL, NULL,
91 sizeof(SPPenContext),
92 4,
93 (GInstanceInitFunc) sp_pen_context_init,
94 NULL, /* value_table */
95 };
96 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
97 }
98 return type;
99 }
101 /**
102 * Initialize the SPPenContext vtable.
103 */
104 static void
105 sp_pen_context_class_init(SPPenContextClass *klass)
106 {
107 GObjectClass *object_class;
108 SPEventContextClass *event_context_class;
110 object_class = (GObjectClass *) klass;
111 event_context_class = (SPEventContextClass *) klass;
113 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
115 object_class->dispose = sp_pen_context_dispose;
117 event_context_class->setup = sp_pen_context_setup;
118 event_context_class->finish = sp_pen_context_finish;
119 event_context_class->set = sp_pen_context_set;
120 event_context_class->root_handler = sp_pen_context_root_handler;
121 event_context_class->item_handler = sp_pen_context_item_handler;
122 }
124 /**
125 * Callback to initialize SPPenContext object.
126 */
127 static void
128 sp_pen_context_init(SPPenContext *pc)
129 {
131 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
133 event_context->cursor_shape = cursor_pen_xpm;
134 event_context->hot_x = 4;
135 event_context->hot_y = 4;
137 pc->npoints = 0;
138 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
139 pc->state = SP_PEN_CONTEXT_POINT;
141 pc->c0 = NULL;
142 pc->c1 = NULL;
143 pc->cl0 = NULL;
144 pc->cl1 = NULL;
146 pc->events_disabled = 0;
147 }
149 /**
150 * Callback to destroy the SPPenContext object's members and itself.
151 */
152 static void
153 sp_pen_context_dispose(GObject *object)
154 {
155 SPPenContext *pc;
157 pc = SP_PEN_CONTEXT(object);
159 if (pc->c0) {
160 gtk_object_destroy(GTK_OBJECT(pc->c0));
161 pc->c0 = NULL;
162 }
163 if (pc->c1) {
164 gtk_object_destroy(GTK_OBJECT(pc->c1));
165 pc->c1 = NULL;
166 }
167 if (pc->cl0) {
168 gtk_object_destroy(GTK_OBJECT(pc->cl0));
169 pc->cl0 = NULL;
170 }
171 if (pc->cl1) {
172 gtk_object_destroy(GTK_OBJECT(pc->cl1));
173 pc->cl1 = NULL;
174 }
176 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
177 }
179 /**
180 * Callback to initialize SPPenContext object.
181 */
182 static void
183 sp_pen_context_setup(SPEventContext *ec)
184 {
185 SPPenContext *pc;
187 pc = SP_PEN_CONTEXT(ec);
189 if (((SPEventContextClass *) pen_parent_class)->setup) {
190 ((SPEventContextClass *) pen_parent_class)->setup(ec);
191 }
193 /* Pen indicators */
194 pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
195 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
196 pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
197 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
198 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
199 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
200 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
201 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
203 sp_canvas_item_hide(pc->c0);
204 sp_canvas_item_hide(pc->c1);
205 sp_canvas_item_hide(pc->cl0);
206 sp_canvas_item_hide(pc->cl1);
208 sp_event_context_read(ec, "mode");
210 pc->anchor_statusbar = false;
212 if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
213 ec->enableSelectionCue();
214 }
215 }
217 static void
218 pen_cancel (SPPenContext *const pc)
219 {
220 pc->state = SP_PEN_CONTEXT_STOP;
221 spdc_reset_colors(pc);
222 sp_canvas_item_hide(pc->c0);
223 sp_canvas_item_hide(pc->c1);
224 sp_canvas_item_hide(pc->cl0);
225 sp_canvas_item_hide(pc->cl1);
226 pc->_message_context->clear();
227 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
229 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
230 }
232 /**
233 * Finalization callback.
234 */
235 static void
236 sp_pen_context_finish(SPEventContext *ec)
237 {
238 SPPenContext *pc = SP_PEN_CONTEXT(ec);
240 if (pc->npoints != 0) {
241 pen_cancel (pc);
242 }
244 if (((SPEventContextClass *) pen_parent_class)->finish) {
245 ((SPEventContextClass *) pen_parent_class)->finish(ec);
246 }
247 }
249 /**
250 * Callback that sets key to value in pen context.
251 */
252 static void
253 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
254 {
255 SPPenContext *pc = SP_PEN_CONTEXT(ec);
257 if (!strcmp(key, "mode")) {
258 if ( val && !strcmp(val, "drag") ) {
259 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
260 } else {
261 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
262 }
263 }
264 }
266 /**
267 * Snaps new node relative to the previous node.
268 */
269 static void
270 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
271 {
272 if (pc->npoints > 0) {
273 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
274 }
276 spdc_endpoint_snap_free(pc, p, state);
277 }
279 /**
280 * Snaps new node's handle relative to the new node.
281 */
282 static void
283 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
284 {
285 g_return_if_fail(( pc->npoints == 2 ||
286 pc->npoints == 5 ));
288 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
289 spdc_endpoint_snap_free(pc, p, state);
290 }
292 static gint
293 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
294 {
295 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
297 gint ret = FALSE;
299 switch (event->type) {
300 case GDK_BUTTON_PRESS:
301 ret = pen_handle_button_press(pc, event->button);
302 break;
303 default:
304 break;
305 }
307 if (!ret) {
308 if (((SPEventContextClass *) pen_parent_class)->item_handler)
309 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
310 }
312 return ret;
313 }
315 /**
316 * Callback to handle all pen events.
317 */
318 static gint
319 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
320 {
321 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
323 gint ret = FALSE;
325 switch (event->type) {
326 case GDK_BUTTON_PRESS:
327 ret = pen_handle_button_press(pc, event->button);
328 break;
330 case GDK_MOTION_NOTIFY:
331 ret = pen_handle_motion_notify(pc, event->motion);
332 break;
334 case GDK_BUTTON_RELEASE:
335 ret = pen_handle_button_release(pc, event->button);
336 break;
338 case GDK_2BUTTON_PRESS:
339 ret = pen_handle_2button_press(pc, event->button);
340 break;
342 case GDK_KEY_PRESS:
343 ret = pen_handle_key_press(pc, event);
344 break;
346 default:
347 break;
348 }
350 if (!ret) {
351 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
352 = ((SPEventContextClass *) pen_parent_class)->root_handler;
353 if (parent_root_handler) {
354 ret = parent_root_handler(ec, event);
355 }
356 }
358 return ret;
359 }
361 /**
362 * Handle mouse button press event.
363 */
364 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
365 {
366 if (pc->events_disabled) {
367 // skip event processing if events are disabled
368 return FALSE;
369 }
371 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
372 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
373 NR::Point const event_w(bevent.x, bevent.y);
374 NR::Point const event_dt(desktop->w2d(event_w));
375 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
377 gint ret = FALSE;
378 if (bevent.button == 1 && !event_context->space_panning) {
380 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
381 return TRUE;
382 }
384 pen_drag_origin_w = event_w;
385 pen_within_tolerance = true;
387 /* Test whether we hit any anchor. */
388 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
390 switch (pc->mode) {
391 case SP_PEN_CONTEXT_MODE_CLICK:
392 /* In click mode we add point on release */
393 switch (pc->state) {
394 case SP_PEN_CONTEXT_POINT:
395 case SP_PEN_CONTEXT_CONTROL:
396 case SP_PEN_CONTEXT_CLOSE:
397 break;
398 case SP_PEN_CONTEXT_STOP:
399 /* This is allowed, if we just cancelled curve */
400 pc->state = SP_PEN_CONTEXT_POINT;
401 break;
402 default:
403 break;
404 }
405 break;
406 case SP_PEN_CONTEXT_MODE_DRAG:
407 switch (pc->state) {
408 case SP_PEN_CONTEXT_STOP:
409 /* This is allowed, if we just cancelled curve */
410 case SP_PEN_CONTEXT_POINT:
411 if (pc->npoints == 0) {
413 if (bevent.state & GDK_CONTROL_MASK) {
414 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
415 ret = TRUE;
416 break;
417 }
419 /* Set start anchor */
420 pc->sa = anchor;
421 NR::Point p;
422 if (anchor) {
424 /* Adjust point to anchor if needed */
425 p = anchor->dp;
426 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
428 } else {
430 // This is the first click of a new curve; deselect item so that
431 // this curve is not combined with it (unless it is drawn from its
432 // anchor, which is handled by the sibling branch above)
433 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
434 if (!(bevent.state & GDK_SHIFT_MASK)) {
436 selection->clear();
437 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
439 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
441 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
442 }
444 /* Create green anchor */
445 p = event_dt;
446 spdc_endpoint_snap(pc, p, bevent.state);
447 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
448 }
449 spdc_pen_set_initial_point(pc, p);
450 } else {
452 /* Set end anchor */
453 pc->ea = anchor;
454 NR::Point p;
455 if (anchor) {
457 p = anchor->dp;
458 // we hit an anchor, will finish the curve (either with or without closing)
459 // in release handler
460 pc->state = SP_PEN_CONTEXT_CLOSE;
462 if (pc->green_anchor && pc->green_anchor->active) {
463 // we clicked on the current curve start, so close it even if
464 // we drag a handle away from it
465 dc->green_closed = TRUE;
466 }
467 ret = TRUE;
468 break;
470 } else {
472 p = event_dt;
473 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
474 spdc_pen_set_subsequent_point(pc, p, true);
475 }
477 }
478 pc->state = SP_PEN_CONTEXT_CONTROL;
479 ret = TRUE;
480 break;
481 case SP_PEN_CONTEXT_CONTROL:
482 g_warning("Button down in CONTROL state");
483 break;
484 case SP_PEN_CONTEXT_CLOSE:
485 g_warning("Button down in CLOSE state");
486 break;
487 default:
488 break;
489 }
490 break;
491 default:
492 break;
493 }
494 } else if (bevent.button == 3) {
495 if (pc->npoints != 0) {
497 spdc_pen_finish_segment(pc, event_dt, bevent.state);
498 if (pc->green_closed) {
499 // finishing at the start anchor, close curve
500 spdc_pen_finish(pc, TRUE);
501 } else {
502 // finishing at some other anchor, finish curve but not close
503 spdc_pen_finish(pc, FALSE);
504 }
506 ret = TRUE;
507 }
508 }
510 return ret;
511 }
513 /**
514 * Handle motion_notify event.
515 */
516 static gint
517 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
518 {
519 gint ret = FALSE;
521 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
523 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
524 // allow scrolling
525 return FALSE;
526 }
528 if (pc->events_disabled) {
529 // skip motion events if pen events are disabled
530 return FALSE;
531 }
533 NR::Point const event_w(mevent.x,
534 mevent.y);
535 if (pen_within_tolerance) {
536 gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
537 "value", 0, 0, 100);
538 if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
539 return FALSE; // Do not drag if we're within tolerance from origin.
540 }
541 }
542 // Once the user has moved farther than tolerance from the original location
543 // (indicating they intend to move the object, not click), then always process the
544 // motion notify coordinates as given (no snapping back to origin)
545 pen_within_tolerance = false;
547 SPDesktop *const dt = pc->desktop;
548 if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
549 /* Grab mouse, so release will not pass unnoticed */
550 pc->grab = SP_CANVAS_ITEM(dt->acetate);
551 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
552 GDK_BUTTON_RELEASE_MASK |
553 GDK_POINTER_MOTION_MASK ),
554 NULL, mevent.time);
555 }
557 /* Find desktop coordinates */
558 NR::Point p = dt->w2d(event_w);
560 /* Test, whether we hit any anchor */
561 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
563 switch (pc->mode) {
564 case SP_PEN_CONTEXT_MODE_CLICK:
565 switch (pc->state) {
566 case SP_PEN_CONTEXT_POINT:
567 if ( pc->npoints != 0 ) {
568 /* Only set point, if we are already appending */
569 spdc_endpoint_snap(pc, p, mevent.state);
570 spdc_pen_set_subsequent_point(pc, p, true);
571 ret = TRUE;
572 }
573 break;
574 case SP_PEN_CONTEXT_CONTROL:
575 case SP_PEN_CONTEXT_CLOSE:
576 /* Placing controls is last operation in CLOSE state */
577 spdc_endpoint_snap(pc, p, mevent.state);
578 spdc_pen_set_ctrl(pc, p, mevent.state);
579 ret = TRUE;
580 break;
581 case SP_PEN_CONTEXT_STOP:
582 /* This is perfectly valid */
583 break;
584 default:
585 break;
586 }
587 break;
588 case SP_PEN_CONTEXT_MODE_DRAG:
589 switch (pc->state) {
590 case SP_PEN_CONTEXT_POINT:
591 if ( pc->npoints > 0 ) {
592 /* Only set point, if we are already appending */
594 if (!anchor) { /* Snap node only if not hitting anchor */
595 spdc_endpoint_snap(pc, p, mevent.state);
596 }
598 spdc_pen_set_subsequent_point(pc, p, !anchor);
600 if (anchor && !pc->anchor_statusbar) {
601 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
602 pc->anchor_statusbar = true;
603 } else if (!anchor && pc->anchor_statusbar) {
604 pc->_message_context->clear();
605 pc->anchor_statusbar = false;
606 }
608 ret = TRUE;
609 } else {
610 if (anchor && !pc->anchor_statusbar) {
611 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
612 pc->anchor_statusbar = true;
613 } else if (!anchor && pc->anchor_statusbar) {
614 pc->_message_context->clear();
615 pc->anchor_statusbar = false;
616 }
617 }
618 break;
619 case SP_PEN_CONTEXT_CONTROL:
620 case SP_PEN_CONTEXT_CLOSE:
621 /* Placing controls is last operation in CLOSE state */
623 // snap the handle
624 spdc_endpoint_snap_handle(pc, p, mevent.state);
626 spdc_pen_set_ctrl(pc, p, mevent.state);
627 gobble_motion_events(GDK_BUTTON1_MASK);
628 ret = TRUE;
629 break;
630 case SP_PEN_CONTEXT_STOP:
631 /* This is perfectly valid */
632 break;
633 default:
634 break;
635 }
636 break;
637 default:
638 break;
639 }
640 return ret;
641 }
643 /**
644 * Handle mouse button release event.
645 */
646 static gint
647 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
648 {
649 if (pc->events_disabled) {
650 // skip event processing if events are disabled
651 return FALSE;
652 }
654 gint ret = FALSE;
655 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
656 if ( revent.button == 1 && !event_context->space_panning) {
658 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
660 NR::Point const event_w(revent.x,
661 revent.y);
662 /* Find desktop coordinates */
663 NR::Point p = pc->desktop->w2d(event_w);
665 /* Test whether we hit any anchor. */
666 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
668 switch (pc->mode) {
669 case SP_PEN_CONTEXT_MODE_CLICK:
670 switch (pc->state) {
671 case SP_PEN_CONTEXT_POINT:
672 if ( pc->npoints == 0 ) {
673 /* Start new thread only with button release */
674 if (anchor) {
675 p = anchor->dp;
676 }
677 pc->sa = anchor;
678 spdc_pen_set_initial_point(pc, p);
679 } else {
680 /* Set end anchor here */
681 pc->ea = anchor;
682 if (anchor) {
683 p = anchor->dp;
684 }
685 }
686 pc->state = SP_PEN_CONTEXT_CONTROL;
687 ret = TRUE;
688 break;
689 case SP_PEN_CONTEXT_CONTROL:
690 /* End current segment */
691 spdc_endpoint_snap(pc, p, revent.state);
692 spdc_pen_finish_segment(pc, p, revent.state);
693 pc->state = SP_PEN_CONTEXT_POINT;
694 ret = TRUE;
695 break;
696 case SP_PEN_CONTEXT_CLOSE:
697 /* End current segment */
698 if (!anchor) { /* Snap node only if not hitting anchor */
699 spdc_endpoint_snap(pc, p, revent.state);
700 }
701 spdc_pen_finish_segment(pc, p, revent.state);
702 spdc_pen_finish(pc, TRUE);
703 pc->state = SP_PEN_CONTEXT_POINT;
704 ret = TRUE;
705 break;
706 case SP_PEN_CONTEXT_STOP:
707 /* This is allowed, if we just cancelled curve */
708 pc->state = SP_PEN_CONTEXT_POINT;
709 ret = TRUE;
710 break;
711 default:
712 break;
713 }
714 break;
715 case SP_PEN_CONTEXT_MODE_DRAG:
716 switch (pc->state) {
717 case SP_PEN_CONTEXT_POINT:
718 case SP_PEN_CONTEXT_CONTROL:
719 spdc_endpoint_snap(pc, p, revent.state);
720 spdc_pen_finish_segment(pc, p, revent.state);
721 break;
722 case SP_PEN_CONTEXT_CLOSE:
723 spdc_endpoint_snap(pc, p, revent.state);
724 spdc_pen_finish_segment(pc, p, revent.state);
725 if (pc->green_closed) {
726 // finishing at the start anchor, close curve
727 spdc_pen_finish(pc, TRUE);
728 } else {
729 // finishing at some other anchor, finish curve but not close
730 spdc_pen_finish(pc, FALSE);
731 }
732 break;
733 case SP_PEN_CONTEXT_STOP:
734 /* This is allowed, if we just cancelled curve */
735 break;
736 default:
737 break;
738 }
739 pc->state = SP_PEN_CONTEXT_POINT;
740 ret = TRUE;
741 break;
742 default:
743 break;
744 }
746 if (pc->grab) {
747 /* Release grab now */
748 sp_canvas_item_ungrab(pc->grab, revent.time);
749 pc->grab = NULL;
750 }
752 ret = TRUE;
754 dc->green_closed = FALSE;
755 }
757 return ret;
758 }
760 static gint
761 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
762 {
763 gint ret = FALSE;
764 if (pc->npoints != 0 && bevent.button != 2) {
765 spdc_pen_finish(pc, FALSE);
766 ret = TRUE;
767 }
768 return ret;
769 }
771 void
772 pen_redraw_all (SPPenContext *const pc)
773 {
774 // green
775 if (pc->green_bpaths) {
776 // remove old piecewise green canvasitems
777 while (pc->green_bpaths) {
778 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
779 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
780 }
781 // one canvas bpath for all of green_curve
782 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
783 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
784 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
786 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
787 }
789 if (pc->green_anchor)
790 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
792 sp_curve_reset(pc->red_curve);
793 sp_curve_moveto(pc->red_curve, pc->p[0]);
794 sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
795 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
797 // handles
798 if (pc->p[0] != pc->p[1]) {
799 SP_CTRL(pc->c1)->moveto(pc->p[1]);
800 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
801 sp_canvas_item_show (pc->c1);
802 sp_canvas_item_show (pc->cl1);
803 } else {
804 sp_canvas_item_hide (pc->c1);
805 sp_canvas_item_hide (pc->cl1);
806 }
808 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
809 if (bpath) {
810 if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
811 SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
812 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
813 sp_canvas_item_show (pc->c0);
814 sp_canvas_item_show (pc->cl0);
815 } else {
816 sp_canvas_item_hide (pc->c0);
817 sp_canvas_item_hide (pc->cl0);
818 }
819 }
820 }
822 void
823 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
824 {
825 if (pc->npoints != 5)
826 return;
828 // green
829 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
830 if (bpath) {
831 if (bpath->code == NR_CURVETO) {
832 bpath->x2 += x;
833 bpath->y2 += y;
834 }
835 bpath->x3 += x;
836 bpath->y3 += y;
837 } else {
838 // start anchor too
839 if (pc->green_anchor) {
840 pc->green_anchor->dp += NR::Point(x, y);
841 }
842 }
844 // red
845 pc->p[0] += NR::Point(x, y);
846 pc->p[1] += NR::Point(x, y);
847 pen_redraw_all(pc);
848 }
850 void
851 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
852 {
853 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
854 }
856 void
857 pen_lastpoint_tocurve (SPPenContext *const pc)
858 {
859 if (pc->npoints != 5)
860 return;
862 // red
863 NArtBpath *const bpath = sp_curve_last_bpath(pc->green_curve);
864 if (bpath && bpath->code == NR_CURVETO) {
865 pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
866 } else {
867 pc->p[1] = pc->p[0] + (pc->p[3] - pc->p[0])*(1/3);
868 }
870 pen_redraw_all(pc);
871 }
873 void
874 pen_lastpoint_toline (SPPenContext *const pc)
875 {
876 if (pc->npoints != 5)
877 return;
879 pc->p[1] = pc->p[0];
881 pen_redraw_all(pc);
882 }
885 static gint
886 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
887 {
888 gint ret = FALSE;
889 gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
891 switch (get_group0_keyval (&event->key)) {
893 case GDK_Left: // move last point left
894 case GDK_KP_Left:
895 case GDK_KP_4:
896 if (!MOD__CTRL) { // not ctrl
897 if (MOD__ALT) { // alt
898 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
899 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
900 }
901 else { // no alt
902 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
903 else pen_lastpoint_move(pc, -nudge, 0); // no shift
904 }
905 ret = TRUE;
906 }
907 break;
908 case GDK_Up: // move last point up
909 case GDK_KP_Up:
910 case GDK_KP_8:
911 if (!MOD__CTRL) { // not ctrl
912 if (MOD__ALT) { // alt
913 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
914 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
915 }
916 else { // no alt
917 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
918 else pen_lastpoint_move(pc, 0, nudge); // no shift
919 }
920 ret = TRUE;
921 }
922 break;
923 case GDK_Right: // move last point right
924 case GDK_KP_Right:
925 case GDK_KP_6:
926 if (!MOD__CTRL) { // not ctrl
927 if (MOD__ALT) { // alt
928 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
929 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
930 }
931 else { // no alt
932 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
933 else pen_lastpoint_move(pc, nudge, 0); // no shift
934 }
935 ret = TRUE;
936 }
937 break;
938 case GDK_Down: // move last point down
939 case GDK_KP_Down:
940 case GDK_KP_2:
941 if (!MOD__CTRL) { // not ctrl
942 if (MOD__ALT) { // alt
943 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
944 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
945 }
946 else { // no alt
947 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
948 else pen_lastpoint_move(pc, 0, -nudge); // no shift
949 }
950 ret = TRUE;
951 }
952 break;
954 case GDK_U:
955 case GDK_u:
956 if (MOD__SHIFT_ONLY) {
957 pen_lastpoint_tocurve(pc);
958 ret = TRUE;
959 }
960 break;
961 case GDK_L:
962 case GDK_l:
963 if (MOD__SHIFT_ONLY) {
964 pen_lastpoint_toline(pc);
965 ret = TRUE;
966 }
967 break;
969 case GDK_Return:
970 case GDK_KP_Enter:
971 if (pc->npoints != 0) {
972 spdc_pen_finish(pc, FALSE);
973 ret = TRUE;
974 }
975 break;
976 case GDK_Escape:
977 if (pc->npoints != 0) {
978 // if drawing, cancel, otherwise pass it up for deselecting
979 pen_cancel (pc);
980 ret = TRUE;
981 }
982 break;
983 case GDK_z:
984 case GDK_Z:
985 if (MOD__CTRL_ONLY && pc->npoints != 0) {
986 // if drawing, cancel, otherwise pass it up for undo
987 pen_cancel (pc);
988 ret = TRUE;
989 }
990 break;
991 case GDK_g:
992 case GDK_G:
993 if (MOD__SHIFT_ONLY) {
994 sp_selection_to_guides();
995 ret = true;
996 }
997 break;
998 case GDK_BackSpace:
999 case GDK_Delete:
1000 case GDK_KP_Delete:
1001 if (sp_curve_is_empty(pc->green_curve)) {
1002 pen_cancel (pc);
1003 ret = TRUE;
1004 } else {
1005 /* Reset red curve */
1006 sp_curve_reset(pc->red_curve);
1007 /* Destroy topmost green bpath */
1008 if (pc->green_bpaths) {
1009 if (pc->green_bpaths->data)
1010 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1011 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1012 }
1013 /* Get last segment */
1014 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1015 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1016 if ( e < 2 ) {
1017 g_warning("Green curve length is %d", e);
1018 break;
1019 }
1020 pc->p[0] = p[e - 2].c(3);
1021 if (p[e - 1].code == NR_CURVETO) {
1022 pc->p[1] = p[e - 1].c(1);
1023 } else {
1024 pc->p[1] = pc->p[0];
1025 }
1026 NR::Point const pt(( pc->npoints < 4
1027 ? p[e - 1].c(3)
1028 : pc->p[3] ));
1029 pc->npoints = 2;
1030 sp_curve_backspace(pc->green_curve);
1031 sp_canvas_item_hide(pc->c0);
1032 sp_canvas_item_hide(pc->c1);
1033 sp_canvas_item_hide(pc->cl0);
1034 sp_canvas_item_hide(pc->cl1);
1035 pc->state = SP_PEN_CONTEXT_POINT;
1036 spdc_pen_set_subsequent_point(pc, pt, true);
1037 ret = TRUE;
1038 }
1039 break;
1040 default:
1041 break;
1042 }
1043 return ret;
1044 }
1046 static void
1047 spdc_reset_colors(SPPenContext *pc)
1048 {
1049 /* Red */
1050 sp_curve_reset(pc->red_curve);
1051 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1052 /* Blue */
1053 sp_curve_reset(pc->blue_curve);
1054 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1055 /* Green */
1056 while (pc->green_bpaths) {
1057 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1058 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1059 }
1060 sp_curve_reset(pc->green_curve);
1061 if (pc->green_anchor) {
1062 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1063 }
1064 pc->sa = NULL;
1065 pc->ea = NULL;
1066 pc->npoints = 0;
1067 pc->red_curve_is_valid = false;
1068 }
1071 static void
1072 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1073 {
1074 g_assert( pc->npoints == 0 );
1076 pc->p[0] = p;
1077 pc->p[1] = p;
1078 pc->npoints = 2;
1079 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1081 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1082 }
1084 static void
1085 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1086 {
1087 g_assert( pc->npoints != 0 );
1088 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1090 pc->p[2] = p;
1091 pc->p[3] = p;
1092 pc->p[4] = p;
1093 pc->npoints = 5;
1094 sp_curve_reset(pc->red_curve);
1095 sp_curve_moveto(pc->red_curve, pc->p[0]);
1096 bool is_curve;
1097 if ( (pc->onlycurves)
1098 || ( pc->p[1] != pc->p[0] ) )
1099 {
1100 sp_curve_curveto(pc->red_curve, pc->p[1], p, p);
1101 is_curve = true;
1102 } else {
1103 sp_curve_lineto(pc->red_curve, p);
1104 is_curve = false;
1105 }
1107 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1109 if (statusbar) {
1110 // status text
1111 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1112 NR::Point rel = p - pc->p[0];
1113 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1114 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1115 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1116 angle = angle_to_compass (angle);
1117 pc->_message_context->setF(Inkscape::IMMEDIATE_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);
1118 g_string_free(dist, FALSE);
1119 }
1120 }
1122 static void
1123 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1124 {
1125 sp_canvas_item_show(pc->c1);
1126 sp_canvas_item_show(pc->cl1);
1128 if ( pc->npoints == 2 ) {
1129 pc->p[1] = p;
1130 sp_canvas_item_hide(pc->c0);
1131 sp_canvas_item_hide(pc->cl0);
1132 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1133 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1135 // status text
1136 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1137 NR::Point rel = p - pc->p[0];
1138 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1139 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1140 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1141 angle = angle_to_compass (angle);
1142 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Curve handle</b>: angle %3.2f°, length %s; with <b>Ctrl</b> to snap angle"), angle, dist->str);
1143 g_string_free(dist, FALSE);
1145 } else if ( pc->npoints == 5 ) {
1146 pc->p[4] = p;
1147 sp_canvas_item_show(pc->c0);
1148 sp_canvas_item_show(pc->cl0);
1149 bool is_symm = false;
1150 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1151 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1152 NR::Point delta = p - pc->p[3];
1153 pc->p[2] = pc->p[3] - delta;
1154 is_symm = true;
1155 sp_curve_reset(pc->red_curve);
1156 sp_curve_moveto(pc->red_curve, pc->p[0]);
1157 sp_curve_curveto(pc->red_curve, pc->p[1], pc->p[2], pc->p[3]);
1158 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1159 }
1160 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1161 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1162 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1163 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1165 // status text
1166 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1167 NR::Point rel = p - pc->p[3];
1168 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1169 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1170 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1171 angle = angle_to_compass (angle);
1172 pc->_message_context->setF(Inkscape::IMMEDIATE_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);
1173 g_string_free(dist, FALSE);
1175 } else {
1176 g_warning("Something bad happened - npoints is %d", pc->npoints);
1177 }
1178 }
1180 static void
1181 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1182 {
1183 if (!sp_curve_empty(pc->red_curve)) {
1184 sp_curve_append_continuous(pc->green_curve, pc->red_curve, 0.0625);
1185 SPCurve *curve = sp_curve_copy(pc->red_curve);
1186 /// \todo fixme:
1187 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1188 sp_curve_unref(curve);
1189 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1191 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1193 pc->p[0] = pc->p[3];
1194 pc->p[1] = pc->p[4];
1195 pc->npoints = 2;
1197 sp_curve_reset(pc->red_curve);
1198 }
1199 }
1201 static void
1202 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1203 {
1204 pen_disable_events(pc);
1206 SPDesktop *const desktop = pc->desktop;
1207 pc->_message_context->clear();
1208 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1210 sp_curve_reset(pc->red_curve);
1211 spdc_concat_colors_and_flush(pc, closed);
1212 pc->sa = NULL;
1213 pc->ea = NULL;
1215 pc->npoints = 0;
1216 pc->state = SP_PEN_CONTEXT_POINT;
1218 sp_canvas_item_hide(pc->c0);
1219 sp_canvas_item_hide(pc->c1);
1220 sp_canvas_item_hide(pc->cl0);
1221 sp_canvas_item_hide(pc->cl1);
1223 if (pc->green_anchor) {
1224 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1225 }
1228 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1230 pen_enable_events(pc);
1231 }
1233 static void
1234 pen_disable_events(SPPenContext *const pc) {
1235 pc->events_disabled++;
1236 }
1238 static void
1239 pen_enable_events(SPPenContext *const pc) {
1240 g_return_if_fail(pc->events_disabled != 0);
1242 pc->events_disabled--;
1243 }
1245 /*
1246 Local Variables:
1247 mode:c++
1248 c-file-style:"stroustrup"
1249 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1250 indent-tabs-mode:nil
1251 fill-column:99
1252 End:
1253 */
1254 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :