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/n-art-bpath.h"
41 #include "libnr/nr-point-ops.h"
42 #include "helper/units.h"
43 #include "macros.h"
44 #include "context-fns.h"
47 static void sp_pen_context_class_init(SPPenContextClass *klass);
48 static void sp_pen_context_init(SPPenContext *pc);
49 static void sp_pen_context_dispose(GObject *object);
51 static void sp_pen_context_setup(SPEventContext *ec);
52 static void sp_pen_context_finish(SPEventContext *ec);
53 static void sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
54 static gint sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event);
55 static gint sp_pen_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
57 static void spdc_pen_set_initial_point(SPPenContext *pc, NR::Point const p);
58 static void spdc_pen_set_subsequent_point(SPPenContext *pc, NR::Point const p, bool statusbar);
59 static void spdc_pen_set_ctrl(SPPenContext *pc, NR::Point const p, guint state);
60 static void spdc_pen_finish_segment(SPPenContext *pc, NR::Point p, guint state);
62 static void spdc_pen_finish(SPPenContext *pc, gboolean closed);
64 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent);
65 static gint pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent);
66 static gint pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent);
67 static gint pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent);
68 static gint pen_handle_key_press(SPPenContext *const pc, GdkEvent *event);
69 static void spdc_reset_colors(SPPenContext *pc);
71 static void pen_disable_events(SPPenContext *const pc);
72 static void pen_enable_events(SPPenContext *const pc);
74 static NR::Point pen_drag_origin_w(0, 0);
75 static bool pen_within_tolerance = false;
77 static SPDrawContextClass *pen_parent_class;
79 /**
80 * Register SPPenContext with Gdk and return its type.
81 */
82 GType
83 sp_pen_context_get_type(void)
84 {
85 static GType type = 0;
86 if (!type) {
87 GTypeInfo info = {
88 sizeof(SPPenContextClass),
89 NULL, NULL,
90 (GClassInitFunc) sp_pen_context_class_init,
91 NULL, NULL,
92 sizeof(SPPenContext),
93 4,
94 (GInstanceInitFunc) sp_pen_context_init,
95 NULL, /* value_table */
96 };
97 type = g_type_register_static(SP_TYPE_DRAW_CONTEXT, "SPPenContext", &info, (GTypeFlags)0);
98 }
99 return type;
100 }
102 /**
103 * Initialize the SPPenContext vtable.
104 */
105 static void
106 sp_pen_context_class_init(SPPenContextClass *klass)
107 {
108 GObjectClass *object_class;
109 SPEventContextClass *event_context_class;
111 object_class = (GObjectClass *) klass;
112 event_context_class = (SPEventContextClass *) klass;
114 pen_parent_class = (SPDrawContextClass*)g_type_class_peek_parent(klass);
116 object_class->dispose = sp_pen_context_dispose;
118 event_context_class->setup = sp_pen_context_setup;
119 event_context_class->finish = sp_pen_context_finish;
120 event_context_class->set = sp_pen_context_set;
121 event_context_class->root_handler = sp_pen_context_root_handler;
122 event_context_class->item_handler = sp_pen_context_item_handler;
123 }
125 /**
126 * Callback to initialize SPPenContext object.
127 */
128 static void
129 sp_pen_context_init(SPPenContext *pc)
130 {
132 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
134 event_context->cursor_shape = cursor_pen_xpm;
135 event_context->hot_x = 4;
136 event_context->hot_y = 4;
138 pc->npoints = 0;
139 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
140 pc->state = SP_PEN_CONTEXT_POINT;
142 pc->c0 = NULL;
143 pc->c1 = NULL;
144 pc->cl0 = NULL;
145 pc->cl1 = NULL;
147 pc->events_disabled = 0;
148 }
150 /**
151 * Callback to destroy the SPPenContext object's members and itself.
152 */
153 static void
154 sp_pen_context_dispose(GObject *object)
155 {
156 SPPenContext *pc;
158 pc = SP_PEN_CONTEXT(object);
160 if (pc->c0) {
161 gtk_object_destroy(GTK_OBJECT(pc->c0));
162 pc->c0 = NULL;
163 }
164 if (pc->c1) {
165 gtk_object_destroy(GTK_OBJECT(pc->c1));
166 pc->c1 = NULL;
167 }
168 if (pc->cl0) {
169 gtk_object_destroy(GTK_OBJECT(pc->cl0));
170 pc->cl0 = NULL;
171 }
172 if (pc->cl1) {
173 gtk_object_destroy(GTK_OBJECT(pc->cl1));
174 pc->cl1 = NULL;
175 }
177 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
178 }
180 /**
181 * Callback to initialize SPPenContext object.
182 */
183 static void
184 sp_pen_context_setup(SPEventContext *ec)
185 {
186 SPPenContext *pc;
188 pc = SP_PEN_CONTEXT(ec);
190 if (((SPEventContextClass *) pen_parent_class)->setup) {
191 ((SPEventContextClass *) pen_parent_class)->setup(ec);
192 }
194 /* Pen indicators */
195 pc->c0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
196 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
197 pc->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
198 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
199 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
200 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
201 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
202 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
204 sp_canvas_item_hide(pc->c0);
205 sp_canvas_item_hide(pc->c1);
206 sp_canvas_item_hide(pc->cl0);
207 sp_canvas_item_hide(pc->cl1);
209 sp_event_context_read(ec, "mode");
211 pc->anchor_statusbar = false;
213 if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
214 ec->enableSelectionCue();
215 }
216 }
218 static void
219 pen_cancel (SPPenContext *const pc)
220 {
221 pc->state = SP_PEN_CONTEXT_STOP;
222 spdc_reset_colors(pc);
223 sp_canvas_item_hide(pc->c0);
224 sp_canvas_item_hide(pc->c1);
225 sp_canvas_item_hide(pc->cl0);
226 sp_canvas_item_hide(pc->cl1);
227 pc->_message_context->clear();
228 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
230 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
231 }
233 /**
234 * Finalization callback.
235 */
236 static void
237 sp_pen_context_finish(SPEventContext *ec)
238 {
239 SPPenContext *pc = SP_PEN_CONTEXT(ec);
241 if (pc->npoints != 0) {
242 pen_cancel (pc);
243 }
245 if (((SPEventContextClass *) pen_parent_class)->finish) {
246 ((SPEventContextClass *) pen_parent_class)->finish(ec);
247 }
248 }
250 /**
251 * Callback that sets key to value in pen context.
252 */
253 static void
254 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
255 {
256 SPPenContext *pc = SP_PEN_CONTEXT(ec);
258 if (!strcmp(key, "mode")) {
259 if ( val && !strcmp(val, "drag") ) {
260 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
261 } else {
262 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
263 }
264 }
265 }
267 /**
268 * Snaps new node relative to the previous node.
269 */
270 static void
271 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
272 {
273 if (pc->npoints > 0) {
274 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
275 }
277 spdc_endpoint_snap_free(pc, p, state);
278 }
280 /**
281 * Snaps new node's handle relative to the new node.
282 */
283 static void
284 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
285 {
286 g_return_if_fail(( pc->npoints == 2 ||
287 pc->npoints == 5 ));
289 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
290 spdc_endpoint_snap_free(pc, p, state);
291 }
293 static gint
294 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
295 {
296 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
298 gint ret = FALSE;
300 switch (event->type) {
301 case GDK_BUTTON_PRESS:
302 ret = pen_handle_button_press(pc, event->button);
303 break;
304 default:
305 break;
306 }
308 if (!ret) {
309 if (((SPEventContextClass *) pen_parent_class)->item_handler)
310 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
311 }
313 return ret;
314 }
316 /**
317 * Callback to handle all pen events.
318 */
319 static gint
320 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
321 {
322 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
324 gint ret = FALSE;
326 switch (event->type) {
327 case GDK_BUTTON_PRESS:
328 ret = pen_handle_button_press(pc, event->button);
329 break;
331 case GDK_MOTION_NOTIFY:
332 ret = pen_handle_motion_notify(pc, event->motion);
333 break;
335 case GDK_BUTTON_RELEASE:
336 ret = pen_handle_button_release(pc, event->button);
337 break;
339 case GDK_2BUTTON_PRESS:
340 ret = pen_handle_2button_press(pc, event->button);
341 break;
343 case GDK_KEY_PRESS:
344 ret = pen_handle_key_press(pc, event);
345 break;
347 default:
348 break;
349 }
351 if (!ret) {
352 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
353 = ((SPEventContextClass *) pen_parent_class)->root_handler;
354 if (parent_root_handler) {
355 ret = parent_root_handler(ec, event);
356 }
357 }
359 return ret;
360 }
362 /**
363 * Handle mouse button press event.
364 */
365 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
366 {
367 if (pc->events_disabled) {
368 // skip event processing if events are disabled
369 return FALSE;
370 }
372 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
373 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
374 NR::Point const event_w(bevent.x, bevent.y);
375 NR::Point const event_dt(desktop->w2d(event_w));
376 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
378 gint ret = FALSE;
379 if (bevent.button == 1 && !event_context->space_panning) {
381 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
382 return TRUE;
383 }
385 pen_drag_origin_w = event_w;
386 pen_within_tolerance = true;
388 /* Test whether we hit any anchor. */
389 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
391 switch (pc->mode) {
392 case SP_PEN_CONTEXT_MODE_CLICK:
393 /* In click mode we add point on release */
394 switch (pc->state) {
395 case SP_PEN_CONTEXT_POINT:
396 case SP_PEN_CONTEXT_CONTROL:
397 case SP_PEN_CONTEXT_CLOSE:
398 break;
399 case SP_PEN_CONTEXT_STOP:
400 /* This is allowed, if we just cancelled curve */
401 pc->state = SP_PEN_CONTEXT_POINT;
402 break;
403 default:
404 break;
405 }
406 break;
407 case SP_PEN_CONTEXT_MODE_DRAG:
408 switch (pc->state) {
409 case SP_PEN_CONTEXT_STOP:
410 /* This is allowed, if we just cancelled curve */
411 case SP_PEN_CONTEXT_POINT:
412 if (pc->npoints == 0) {
414 if (bevent.state & GDK_CONTROL_MASK) {
415 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
416 ret = TRUE;
417 break;
418 }
420 /* Set start anchor */
421 pc->sa = anchor;
422 NR::Point p;
423 if (anchor) {
425 /* Adjust point to anchor if needed */
426 p = anchor->dp;
427 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
429 } else {
431 // This is the first click of a new curve; deselect item so that
432 // this curve is not combined with it (unless it is drawn from its
433 // anchor, which is handled by the sibling branch above)
434 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
435 if (!(bevent.state & GDK_SHIFT_MASK)) {
437 selection->clear();
438 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
440 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
442 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
443 }
445 /* Create green anchor */
446 p = event_dt;
447 spdc_endpoint_snap(pc, p, bevent.state);
448 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
449 }
450 spdc_pen_set_initial_point(pc, p);
451 } else {
453 /* Set end anchor */
454 pc->ea = anchor;
455 NR::Point p;
456 if (anchor) {
458 p = anchor->dp;
459 // we hit an anchor, will finish the curve (either with or without closing)
460 // in release handler
461 pc->state = SP_PEN_CONTEXT_CLOSE;
463 if (pc->green_anchor && pc->green_anchor->active) {
464 // we clicked on the current curve start, so close it even if
465 // we drag a handle away from it
466 dc->green_closed = TRUE;
467 }
468 ret = TRUE;
469 break;
471 } else {
473 p = event_dt;
474 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
475 spdc_pen_set_subsequent_point(pc, p, true);
476 }
478 }
479 pc->state = SP_PEN_CONTEXT_CONTROL;
480 ret = TRUE;
481 break;
482 case SP_PEN_CONTEXT_CONTROL:
483 g_warning("Button down in CONTROL state");
484 break;
485 case SP_PEN_CONTEXT_CLOSE:
486 g_warning("Button down in CLOSE state");
487 break;
488 default:
489 break;
490 }
491 break;
492 default:
493 break;
494 }
495 } else if (bevent.button == 3) {
496 if (pc->npoints != 0) {
498 spdc_pen_finish_segment(pc, event_dt, bevent.state);
499 if (pc->green_closed) {
500 // finishing at the start anchor, close curve
501 spdc_pen_finish(pc, TRUE);
502 } else {
503 // finishing at some other anchor, finish curve but not close
504 spdc_pen_finish(pc, FALSE);
505 }
507 ret = TRUE;
508 }
509 }
511 return ret;
512 }
514 /**
515 * Handle motion_notify event.
516 */
517 static gint
518 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
519 {
520 gint ret = FALSE;
522 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
524 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
525 // allow scrolling
526 return FALSE;
527 }
529 if (pc->events_disabled) {
530 // skip motion events if pen events are disabled
531 return FALSE;
532 }
534 NR::Point const event_w(mevent.x,
535 mevent.y);
536 if (pen_within_tolerance) {
537 gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
538 "value", 0, 0, 100);
539 if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
540 return FALSE; // Do not drag if we're within tolerance from origin.
541 }
542 }
543 // Once the user has moved farther than tolerance from the original location
544 // (indicating they intend to move the object, not click), then always process the
545 // motion notify coordinates as given (no snapping back to origin)
546 pen_within_tolerance = false;
548 SPDesktop *const dt = pc->desktop;
549 if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
550 /* Grab mouse, so release will not pass unnoticed */
551 pc->grab = SP_CANVAS_ITEM(dt->acetate);
552 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
553 GDK_BUTTON_RELEASE_MASK |
554 GDK_POINTER_MOTION_MASK ),
555 NULL, mevent.time);
556 }
558 /* Find desktop coordinates */
559 NR::Point p = dt->w2d(event_w);
561 /* Test, whether we hit any anchor */
562 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
564 switch (pc->mode) {
565 case SP_PEN_CONTEXT_MODE_CLICK:
566 switch (pc->state) {
567 case SP_PEN_CONTEXT_POINT:
568 if ( pc->npoints != 0 ) {
569 /* Only set point, if we are already appending */
570 spdc_endpoint_snap(pc, p, mevent.state);
571 spdc_pen_set_subsequent_point(pc, p, true);
572 ret = TRUE;
573 }
574 break;
575 case SP_PEN_CONTEXT_CONTROL:
576 case SP_PEN_CONTEXT_CLOSE:
577 /* Placing controls is last operation in CLOSE state */
578 spdc_endpoint_snap(pc, p, mevent.state);
579 spdc_pen_set_ctrl(pc, p, mevent.state);
580 ret = TRUE;
581 break;
582 case SP_PEN_CONTEXT_STOP:
583 /* This is perfectly valid */
584 break;
585 default:
586 break;
587 }
588 break;
589 case SP_PEN_CONTEXT_MODE_DRAG:
590 switch (pc->state) {
591 case SP_PEN_CONTEXT_POINT:
592 if ( pc->npoints > 0 ) {
593 /* Only set point, if we are already appending */
595 if (!anchor) { /* Snap node only if not hitting anchor */
596 spdc_endpoint_snap(pc, p, mevent.state);
597 }
599 spdc_pen_set_subsequent_point(pc, p, !anchor);
601 if (anchor && !pc->anchor_statusbar) {
602 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
603 pc->anchor_statusbar = true;
604 } else if (!anchor && pc->anchor_statusbar) {
605 pc->_message_context->clear();
606 pc->anchor_statusbar = false;
607 }
609 ret = TRUE;
610 } else {
611 if (anchor && !pc->anchor_statusbar) {
612 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
613 pc->anchor_statusbar = true;
614 } else if (!anchor && pc->anchor_statusbar) {
615 pc->_message_context->clear();
616 pc->anchor_statusbar = false;
617 }
618 }
619 break;
620 case SP_PEN_CONTEXT_CONTROL:
621 case SP_PEN_CONTEXT_CLOSE:
622 /* Placing controls is last operation in CLOSE state */
624 // snap the handle
625 spdc_endpoint_snap_handle(pc, p, mevent.state);
627 spdc_pen_set_ctrl(pc, p, mevent.state);
628 gobble_motion_events(GDK_BUTTON1_MASK);
629 ret = TRUE;
630 break;
631 case SP_PEN_CONTEXT_STOP:
632 /* This is perfectly valid */
633 break;
634 default:
635 break;
636 }
637 break;
638 default:
639 break;
640 }
641 return ret;
642 }
644 /**
645 * Handle mouse button release event.
646 */
647 static gint
648 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
649 {
650 if (pc->events_disabled) {
651 // skip event processing if events are disabled
652 return FALSE;
653 }
655 gint ret = FALSE;
656 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
657 if ( revent.button == 1 && !event_context->space_panning) {
659 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
661 NR::Point const event_w(revent.x,
662 revent.y);
663 /* Find desktop coordinates */
664 NR::Point p = pc->desktop->w2d(event_w);
666 /* Test whether we hit any anchor. */
667 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
669 switch (pc->mode) {
670 case SP_PEN_CONTEXT_MODE_CLICK:
671 switch (pc->state) {
672 case SP_PEN_CONTEXT_POINT:
673 if ( pc->npoints == 0 ) {
674 /* Start new thread only with button release */
675 if (anchor) {
676 p = anchor->dp;
677 }
678 pc->sa = anchor;
679 spdc_pen_set_initial_point(pc, p);
680 } else {
681 /* Set end anchor here */
682 pc->ea = anchor;
683 if (anchor) {
684 p = anchor->dp;
685 }
686 }
687 pc->state = SP_PEN_CONTEXT_CONTROL;
688 ret = TRUE;
689 break;
690 case SP_PEN_CONTEXT_CONTROL:
691 /* End current segment */
692 spdc_endpoint_snap(pc, p, revent.state);
693 spdc_pen_finish_segment(pc, p, revent.state);
694 pc->state = SP_PEN_CONTEXT_POINT;
695 ret = TRUE;
696 break;
697 case SP_PEN_CONTEXT_CLOSE:
698 /* End current segment */
699 if (!anchor) { /* Snap node only if not hitting anchor */
700 spdc_endpoint_snap(pc, p, revent.state);
701 }
702 spdc_pen_finish_segment(pc, p, revent.state);
703 spdc_pen_finish(pc, TRUE);
704 pc->state = SP_PEN_CONTEXT_POINT;
705 ret = TRUE;
706 break;
707 case SP_PEN_CONTEXT_STOP:
708 /* This is allowed, if we just cancelled curve */
709 pc->state = SP_PEN_CONTEXT_POINT;
710 ret = TRUE;
711 break;
712 default:
713 break;
714 }
715 break;
716 case SP_PEN_CONTEXT_MODE_DRAG:
717 switch (pc->state) {
718 case SP_PEN_CONTEXT_POINT:
719 case SP_PEN_CONTEXT_CONTROL:
720 spdc_endpoint_snap(pc, p, revent.state);
721 spdc_pen_finish_segment(pc, p, revent.state);
722 break;
723 case SP_PEN_CONTEXT_CLOSE:
724 spdc_endpoint_snap(pc, p, revent.state);
725 spdc_pen_finish_segment(pc, p, revent.state);
726 if (pc->green_closed) {
727 // finishing at the start anchor, close curve
728 spdc_pen_finish(pc, TRUE);
729 } else {
730 // finishing at some other anchor, finish curve but not close
731 spdc_pen_finish(pc, FALSE);
732 }
733 break;
734 case SP_PEN_CONTEXT_STOP:
735 /* This is allowed, if we just cancelled curve */
736 break;
737 default:
738 break;
739 }
740 pc->state = SP_PEN_CONTEXT_POINT;
741 ret = TRUE;
742 break;
743 default:
744 break;
745 }
747 if (pc->grab) {
748 /* Release grab now */
749 sp_canvas_item_ungrab(pc->grab, revent.time);
750 pc->grab = NULL;
751 }
753 ret = TRUE;
755 dc->green_closed = FALSE;
756 }
758 return ret;
759 }
761 static gint
762 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
763 {
764 gint ret = FALSE;
765 if (pc->npoints != 0 && bevent.button != 2) {
766 spdc_pen_finish(pc, FALSE);
767 ret = TRUE;
768 }
769 return ret;
770 }
772 void
773 pen_redraw_all (SPPenContext *const pc)
774 {
775 // green
776 if (pc->green_bpaths) {
777 // remove old piecewise green canvasitems
778 while (pc->green_bpaths) {
779 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
780 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
781 }
782 // one canvas bpath for all of green_curve
783 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
784 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
785 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
787 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
788 }
790 if (pc->green_anchor)
791 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
793 pc->red_curve->reset();
794 pc->red_curve->moveto(pc->p[0]);
795 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
796 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
798 // handles
799 if (pc->p[0] != pc->p[1]) {
800 SP_CTRL(pc->c1)->moveto(pc->p[1]);
801 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
802 sp_canvas_item_show (pc->c1);
803 sp_canvas_item_show (pc->cl1);
804 } else {
805 sp_canvas_item_hide (pc->c1);
806 sp_canvas_item_hide (pc->cl1);
807 }
809 NArtBpath *const bpath = pc->green_curve->last_bpath();
810 if (bpath) {
811 if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
812 SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
813 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
814 sp_canvas_item_show (pc->c0);
815 sp_canvas_item_show (pc->cl0);
816 } else {
817 sp_canvas_item_hide (pc->c0);
818 sp_canvas_item_hide (pc->cl0);
819 }
820 }
821 }
823 void
824 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
825 {
826 if (pc->npoints != 5)
827 return;
829 // green
830 NArtBpath *const bpath = pc->green_curve->last_bpath();
831 if (bpath) {
832 if (bpath->code == NR_CURVETO) {
833 bpath->x2 += x;
834 bpath->y2 += y;
835 }
836 bpath->x3 += x;
837 bpath->y3 += y;
838 } else {
839 // start anchor too
840 if (pc->green_anchor) {
841 pc->green_anchor->dp += NR::Point(x, y);
842 }
843 }
845 // red
846 pc->p[0] += NR::Point(x, y);
847 pc->p[1] += NR::Point(x, y);
848 pen_redraw_all(pc);
849 }
851 void
852 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
853 {
854 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
855 }
857 void
858 pen_lastpoint_tocurve (SPPenContext *const pc)
859 {
860 if (pc->npoints != 5)
861 return;
863 // red
864 NArtBpath *const bpath = pc->green_curve->last_bpath();
865 if (bpath && bpath->code == NR_CURVETO) {
866 pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
867 } else {
868 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
869 }
871 pen_redraw_all(pc);
872 }
874 void
875 pen_lastpoint_toline (SPPenContext *const pc)
876 {
877 if (pc->npoints != 5)
878 return;
880 pc->p[1] = pc->p[0];
882 pen_redraw_all(pc);
883 }
886 static gint
887 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
888 {
889 gint ret = FALSE;
890 gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
892 switch (get_group0_keyval (&event->key)) {
894 case GDK_Left: // move last point left
895 case GDK_KP_Left:
896 case GDK_KP_4:
897 if (!MOD__CTRL) { // not ctrl
898 if (MOD__ALT) { // alt
899 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
900 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
901 }
902 else { // no alt
903 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
904 else pen_lastpoint_move(pc, -nudge, 0); // no shift
905 }
906 ret = TRUE;
907 }
908 break;
909 case GDK_Up: // move last point up
910 case GDK_KP_Up:
911 case GDK_KP_8:
912 if (!MOD__CTRL) { // not ctrl
913 if (MOD__ALT) { // alt
914 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
915 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
916 }
917 else { // no alt
918 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
919 else pen_lastpoint_move(pc, 0, nudge); // no shift
920 }
921 ret = TRUE;
922 }
923 break;
924 case GDK_Right: // move last point right
925 case GDK_KP_Right:
926 case GDK_KP_6:
927 if (!MOD__CTRL) { // not ctrl
928 if (MOD__ALT) { // alt
929 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
930 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
931 }
932 else { // no alt
933 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
934 else pen_lastpoint_move(pc, nudge, 0); // no shift
935 }
936 ret = TRUE;
937 }
938 break;
939 case GDK_Down: // move last point down
940 case GDK_KP_Down:
941 case GDK_KP_2:
942 if (!MOD__CTRL) { // not ctrl
943 if (MOD__ALT) { // alt
944 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
945 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
946 }
947 else { // no alt
948 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
949 else pen_lastpoint_move(pc, 0, -nudge); // no shift
950 }
951 ret = TRUE;
952 }
953 break;
955 case GDK_U:
956 case GDK_u:
957 if (MOD__SHIFT_ONLY) {
958 pen_lastpoint_tocurve(pc);
959 ret = TRUE;
960 }
961 break;
962 case GDK_L:
963 case GDK_l:
964 if (MOD__SHIFT_ONLY) {
965 pen_lastpoint_toline(pc);
966 ret = TRUE;
967 }
968 break;
970 case GDK_Return:
971 case GDK_KP_Enter:
972 if (pc->npoints != 0) {
973 spdc_pen_finish(pc, FALSE);
974 ret = TRUE;
975 }
976 break;
977 case GDK_Escape:
978 if (pc->npoints != 0) {
979 // if drawing, cancel, otherwise pass it up for deselecting
980 pen_cancel (pc);
981 ret = TRUE;
982 }
983 break;
984 case GDK_z:
985 case GDK_Z:
986 if (MOD__CTRL_ONLY && pc->npoints != 0) {
987 // if drawing, cancel, otherwise pass it up for undo
988 pen_cancel (pc);
989 ret = TRUE;
990 }
991 break;
992 case GDK_g:
993 case GDK_G:
994 if (MOD__SHIFT_ONLY) {
995 sp_selection_to_guides();
996 ret = true;
997 }
998 break;
999 case GDK_BackSpace:
1000 case GDK_Delete:
1001 case GDK_KP_Delete:
1002 if (pc->green_curve->is_empty()) {
1003 if (!pc->red_curve->is_empty()) {
1004 pen_cancel (pc);
1005 ret = TRUE;
1006 } else {
1007 // do nothing; this event should be handled upstream
1008 }
1009 } else {
1010 /* Reset red curve */
1011 pc->red_curve->reset();
1012 /* Destroy topmost green bpath */
1013 if (pc->green_bpaths) {
1014 if (pc->green_bpaths->data)
1015 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1016 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1017 }
1018 /* Get last segment */
1019 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1020 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1021 if ( e < 2 ) {
1022 g_warning("Green curve length is %d", e);
1023 break;
1024 }
1025 pc->p[0] = p[e - 2].c(3);
1026 if (p[e - 1].code == NR_CURVETO) {
1027 pc->p[1] = p[e - 1].c(1);
1028 } else {
1029 pc->p[1] = pc->p[0];
1030 }
1031 NR::Point const pt(( pc->npoints < 4
1032 ? p[e - 1].c(3)
1033 : pc->p[3] ));
1034 pc->npoints = 2;
1035 pc->green_curve->backspace();
1036 sp_canvas_item_hide(pc->c0);
1037 sp_canvas_item_hide(pc->c1);
1038 sp_canvas_item_hide(pc->cl0);
1039 sp_canvas_item_hide(pc->cl1);
1040 pc->state = SP_PEN_CONTEXT_POINT;
1041 spdc_pen_set_subsequent_point(pc, pt, true);
1042 ret = TRUE;
1043 }
1044 break;
1045 default:
1046 break;
1047 }
1048 return ret;
1049 }
1051 static void
1052 spdc_reset_colors(SPPenContext *pc)
1053 {
1054 /* Red */
1055 pc->red_curve->reset();
1056 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1057 /* Blue */
1058 pc->blue_curve->reset();
1059 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1060 /* Green */
1061 while (pc->green_bpaths) {
1062 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1063 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1064 }
1065 pc->green_curve->reset();
1066 if (pc->green_anchor) {
1067 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1068 }
1069 pc->sa = NULL;
1070 pc->ea = NULL;
1071 pc->npoints = 0;
1072 pc->red_curve_is_valid = false;
1073 }
1076 static void
1077 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1078 {
1079 g_assert( pc->npoints == 0 );
1081 pc->p[0] = p;
1082 pc->p[1] = p;
1083 pc->npoints = 2;
1084 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1086 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1087 }
1089 /**
1090 * Show the status message for the current line/curve segment.
1091 * This type of message always shows angle/distance as the last
1092 * two parameters ("angle %3.2f°, distance %s").
1093 */
1094 static void
1095 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1096 {
1097 g_assert(pc != NULL);
1098 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1099 g_assert(message != NULL);
1101 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1102 NR::Point rel = p - pc->p[pc_point_to_compare];
1103 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1104 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1105 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1106 angle = angle_to_compass (angle);
1108 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1109 g_string_free(dist, FALSE);
1110 }
1112 static void
1113 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1114 {
1115 g_assert( pc->npoints != 0 );
1116 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1118 pc->p[2] = p;
1119 pc->p[3] = p;
1120 pc->p[4] = p;
1121 pc->npoints = 5;
1122 pc->red_curve->reset();
1123 pc->red_curve->moveto(pc->p[0]);
1124 bool is_curve;
1125 if ( (pc->onlycurves)
1126 || ( pc->p[1] != pc->p[0] ) )
1127 {
1128 pc->red_curve->curveto(pc->p[1], p, p);
1129 is_curve = true;
1130 } else {
1131 pc->red_curve->lineto(p);
1132 is_curve = false;
1133 }
1135 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1137 if (statusbar) {
1138 gchar *message = is_curve ?
1139 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1140 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1141 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1142 }
1143 }
1145 static void
1146 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1147 {
1148 sp_canvas_item_show(pc->c1);
1149 sp_canvas_item_show(pc->cl1);
1151 if ( pc->npoints == 2 ) {
1152 pc->p[1] = p;
1153 sp_canvas_item_hide(pc->c0);
1154 sp_canvas_item_hide(pc->cl0);
1155 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1156 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1158 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"));
1159 } else if ( pc->npoints == 5 ) {
1160 pc->p[4] = p;
1161 sp_canvas_item_show(pc->c0);
1162 sp_canvas_item_show(pc->cl0);
1163 bool is_symm = false;
1164 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1165 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1166 NR::Point delta = p - pc->p[3];
1167 pc->p[2] = pc->p[3] - delta;
1168 is_symm = true;
1169 pc->red_curve->reset();
1170 pc->red_curve->moveto(pc->p[0]);
1171 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1172 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1173 }
1174 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1175 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1176 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1177 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1179 gchar *message = is_symm ?
1180 _("<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") :
1181 _("<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");
1182 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1183 } else {
1184 g_warning("Something bad happened - npoints is %d", pc->npoints);
1185 }
1186 }
1188 static void
1189 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1190 {
1191 if (!pc->red_curve->is_empty()) {
1192 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1193 SPCurve *curve = pc->red_curve->copy();
1194 /// \todo fixme:
1195 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1196 curve->unref();
1197 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1199 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1201 pc->p[0] = pc->p[3];
1202 pc->p[1] = pc->p[4];
1203 pc->npoints = 2;
1205 pc->red_curve->reset();
1206 }
1207 }
1209 static void
1210 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1211 {
1212 pen_disable_events(pc);
1214 SPDesktop *const desktop = pc->desktop;
1215 pc->_message_context->clear();
1216 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1218 pc->red_curve->reset();
1219 spdc_concat_colors_and_flush(pc, closed);
1220 pc->sa = NULL;
1221 pc->ea = NULL;
1223 pc->npoints = 0;
1224 pc->state = SP_PEN_CONTEXT_POINT;
1226 sp_canvas_item_hide(pc->c0);
1227 sp_canvas_item_hide(pc->c1);
1228 sp_canvas_item_hide(pc->cl0);
1229 sp_canvas_item_hide(pc->cl1);
1231 if (pc->green_anchor) {
1232 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1233 }
1236 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1238 pen_enable_events(pc);
1239 }
1241 static void
1242 pen_disable_events(SPPenContext *const pc) {
1243 pc->events_disabled++;
1244 }
1246 static void
1247 pen_enable_events(SPPenContext *const pc) {
1248 g_return_if_fail(pc->events_disabled != 0);
1250 pc->events_disabled--;
1251 }
1253 /*
1254 Local Variables:
1255 mode:c++
1256 c-file-style:"stroustrup"
1257 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1258 indent-tabs-mode:nil
1259 fill-column:99
1260 End:
1261 */
1262 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :