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;
149 pc->polylines_only = false;
150 }
152 /**
153 * Callback to destroy the SPPenContext object's members and itself.
154 */
155 static void
156 sp_pen_context_dispose(GObject *object)
157 {
158 SPPenContext *pc;
160 pc = SP_PEN_CONTEXT(object);
162 if (pc->c0) {
163 gtk_object_destroy(GTK_OBJECT(pc->c0));
164 pc->c0 = NULL;
165 }
166 if (pc->c1) {
167 gtk_object_destroy(GTK_OBJECT(pc->c1));
168 pc->c1 = NULL;
169 }
170 if (pc->cl0) {
171 gtk_object_destroy(GTK_OBJECT(pc->cl0));
172 pc->cl0 = NULL;
173 }
174 if (pc->cl1) {
175 gtk_object_destroy(GTK_OBJECT(pc->cl1));
176 pc->cl1 = NULL;
177 }
179 G_OBJECT_CLASS(pen_parent_class)->dispose(object);
180 }
182 /**
183 * Callback to initialize SPPenContext object.
184 */
185 static void
186 sp_pen_context_setup(SPEventContext *ec)
187 {
188 SPPenContext *pc;
190 pc = SP_PEN_CONTEXT(ec);
192 if (((SPEventContextClass *) pen_parent_class)->setup) {
193 ((SPEventContextClass *) pen_parent_class)->setup(ec);
194 }
196 /* Pen indicators */
197 pc->c0 = 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->c1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRL, "shape", SP_CTRL_SHAPE_CIRCLE,
200 "size", 4.0, "filled", 0, "fill_color", 0xff00007f, "stroked", 1, "stroke_color", 0x0000ff7f, NULL);
201 pc->cl0 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
202 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl0), 0x0000007f);
203 pc->cl1 = sp_canvas_item_new(sp_desktop_controls(SP_EVENT_CONTEXT_DESKTOP(ec)), SP_TYPE_CTRLLINE, NULL);
204 sp_ctrlline_set_rgba32(SP_CTRLLINE(pc->cl1), 0x0000007f);
206 sp_canvas_item_hide(pc->c0);
207 sp_canvas_item_hide(pc->c1);
208 sp_canvas_item_hide(pc->cl0);
209 sp_canvas_item_hide(pc->cl1);
211 sp_event_context_read(ec, "mode");
213 pc->anchor_statusbar = false;
215 if (prefs_get_int_attribute("tools.freehand.pen", "selcue", 0) != 0) {
216 ec->enableSelectionCue();
217 }
218 }
220 static void
221 pen_cancel (SPPenContext *const pc)
222 {
223 pc->state = SP_PEN_CONTEXT_STOP;
224 spdc_reset_colors(pc);
225 sp_canvas_item_hide(pc->c0);
226 sp_canvas_item_hide(pc->c1);
227 sp_canvas_item_hide(pc->cl0);
228 sp_canvas_item_hide(pc->cl1);
229 pc->_message_context->clear();
230 pc->_message_context->flash(Inkscape::NORMAL_MESSAGE, _("Drawing cancelled"));
232 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
233 }
235 /**
236 * Finalization callback.
237 */
238 static void
239 sp_pen_context_finish(SPEventContext *ec)
240 {
241 SPPenContext *pc = SP_PEN_CONTEXT(ec);
243 if (pc->npoints != 0) {
244 pen_cancel (pc);
245 }
247 if (((SPEventContextClass *) pen_parent_class)->finish) {
248 ((SPEventContextClass *) pen_parent_class)->finish(ec);
249 }
250 }
252 /**
253 * Callback that sets key to value in pen context.
254 */
255 static void
256 sp_pen_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
257 {
258 SPPenContext *pc = SP_PEN_CONTEXT(ec);
260 if (!strcmp(key, "mode")) {
261 if ( val && !strcmp(val, "drag") ) {
262 pc->mode = SP_PEN_CONTEXT_MODE_DRAG;
263 } else {
264 pc->mode = SP_PEN_CONTEXT_MODE_CLICK;
265 }
266 }
267 }
269 /**
270 * Snaps new node relative to the previous node.
271 */
272 static void
273 spdc_endpoint_snap(SPPenContext const *const pc, NR::Point &p, guint const state)
274 {
275 if (pc->npoints > 0) {
276 spdc_endpoint_snap_rotation(pc, p, pc->p[0], state);
277 }
279 spdc_endpoint_snap_free(pc, p, state);
280 }
282 /**
283 * Snaps new node's handle relative to the new node.
284 */
285 static void
286 spdc_endpoint_snap_handle(SPPenContext const *const pc, NR::Point &p, guint const state)
287 {
288 g_return_if_fail(( pc->npoints == 2 ||
289 pc->npoints == 5 ));
291 spdc_endpoint_snap_rotation(pc, p, pc->p[pc->npoints - 2], state);
292 spdc_endpoint_snap_free(pc, p, state);
293 }
295 static gint
296 sp_pen_context_item_handler(SPEventContext *ec, SPItem *item, GdkEvent *event)
297 {
298 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
300 gint ret = FALSE;
302 switch (event->type) {
303 case GDK_BUTTON_PRESS:
304 ret = pen_handle_button_press(pc, event->button);
305 break;
306 default:
307 break;
308 }
310 if (!ret) {
311 if (((SPEventContextClass *) pen_parent_class)->item_handler)
312 ret = ((SPEventContextClass *) pen_parent_class)->item_handler(ec, item, event);
313 }
315 return ret;
316 }
318 /**
319 * Callback to handle all pen events.
320 */
321 static gint
322 sp_pen_context_root_handler(SPEventContext *ec, GdkEvent *event)
323 {
324 SPPenContext *const pc = SP_PEN_CONTEXT(ec);
326 gint ret = FALSE;
328 switch (event->type) {
329 case GDK_BUTTON_PRESS:
330 ret = pen_handle_button_press(pc, event->button);
331 break;
333 case GDK_MOTION_NOTIFY:
334 ret = pen_handle_motion_notify(pc, event->motion);
335 break;
337 case GDK_BUTTON_RELEASE:
338 ret = pen_handle_button_release(pc, event->button);
339 break;
341 case GDK_2BUTTON_PRESS:
342 ret = pen_handle_2button_press(pc, event->button);
343 break;
345 case GDK_KEY_PRESS:
346 ret = pen_handle_key_press(pc, event);
347 break;
349 default:
350 break;
351 }
353 if (!ret) {
354 gint (*const parent_root_handler)(SPEventContext *, GdkEvent *)
355 = ((SPEventContextClass *) pen_parent_class)->root_handler;
356 if (parent_root_handler) {
357 ret = parent_root_handler(ec, event);
358 }
359 }
361 return ret;
362 }
364 /**
365 * Handle mouse button press event.
366 */
367 static gint pen_handle_button_press(SPPenContext *const pc, GdkEventButton const &bevent)
368 {
369 if (pc->events_disabled) {
370 // skip event processing if events are disabled
371 return FALSE;
372 }
374 SPDrawContext * const dc = SP_DRAW_CONTEXT(pc);
375 SPDesktop * const desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
376 NR::Point const event_w(bevent.x, bevent.y);
377 NR::Point const event_dt(desktop->w2d(event_w));
378 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
380 gint ret = FALSE;
381 if (bevent.button == 1 && !event_context->space_panning) {
383 if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
384 return TRUE;
385 }
387 pen_drag_origin_w = event_w;
388 pen_within_tolerance = true;
390 /* Test whether we hit any anchor. */
391 SPDrawAnchor * const anchor = spdc_test_inside(pc, event_w);
393 switch (pc->mode) {
394 case SP_PEN_CONTEXT_MODE_CLICK:
395 /* In click mode we add point on release */
396 switch (pc->state) {
397 case SP_PEN_CONTEXT_POINT:
398 case SP_PEN_CONTEXT_CONTROL:
399 case SP_PEN_CONTEXT_CLOSE:
400 break;
401 case SP_PEN_CONTEXT_STOP:
402 /* This is allowed, if we just cancelled curve */
403 pc->state = SP_PEN_CONTEXT_POINT;
404 break;
405 default:
406 break;
407 }
408 break;
409 case SP_PEN_CONTEXT_MODE_DRAG:
410 switch (pc->state) {
411 case SP_PEN_CONTEXT_STOP:
412 /* This is allowed, if we just cancelled curve */
413 case SP_PEN_CONTEXT_POINT:
414 if (pc->npoints == 0) {
416 if (bevent.state & GDK_CONTROL_MASK) {
417 freehand_create_single_dot(event_context, event_dt, "tools.freehand.pen", bevent.state);
418 ret = TRUE;
419 break;
420 }
422 /* Set start anchor */
423 pc->sa = anchor;
424 NR::Point p;
425 if (anchor) {
427 /* Adjust point to anchor if needed */
428 p = anchor->dp;
429 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
431 } else {
433 // This is the first click of a new curve; deselect item so that
434 // this curve is not combined with it (unless it is drawn from its
435 // anchor, which is handled by the sibling branch above)
436 Inkscape::Selection * const selection = sp_desktop_selection(desktop);
437 if (!(bevent.state & GDK_SHIFT_MASK)) {
439 selection->clear();
440 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
442 } else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
444 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
445 }
447 /* Create green anchor */
448 p = event_dt;
449 spdc_endpoint_snap(pc, p, bevent.state);
450 pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, p);
451 }
452 spdc_pen_set_initial_point(pc, p);
453 } else {
455 /* Set end anchor */
456 pc->ea = anchor;
457 NR::Point p;
458 if (anchor) {
460 p = anchor->dp;
461 // we hit an anchor, will finish the curve (either with or without closing)
462 // in release handler
463 pc->state = SP_PEN_CONTEXT_CLOSE;
465 if (pc->green_anchor && pc->green_anchor->active) {
466 // we clicked on the current curve start, so close it even if
467 // we drag a handle away from it
468 dc->green_closed = TRUE;
469 }
470 ret = TRUE;
471 break;
473 } else {
475 p = event_dt;
476 spdc_endpoint_snap(pc, p, bevent.state); /* Snap node only if not hitting anchor. */
477 spdc_pen_set_subsequent_point(pc, p, true);
478 if (pc->polylines_only) {
479 spdc_pen_finish_segment(pc, p, bevent.state);
480 }
481 }
483 }
484 pc->state = pc->polylines_only ? SP_PEN_CONTEXT_POINT : SP_PEN_CONTEXT_CONTROL;
485 ret = TRUE;
486 break;
487 case SP_PEN_CONTEXT_CONTROL:
488 g_warning("Button down in CONTROL state");
489 break;
490 case SP_PEN_CONTEXT_CLOSE:
491 g_warning("Button down in CLOSE state");
492 break;
493 default:
494 break;
495 }
496 break;
497 default:
498 break;
499 }
500 } else if (bevent.button == 3) {
501 if (pc->npoints != 0) {
503 spdc_pen_finish_segment(pc, event_dt, bevent.state);
504 if (pc->green_closed) {
505 // finishing at the start anchor, close curve
506 spdc_pen_finish(pc, TRUE);
507 } else {
508 // finishing at some other anchor, finish curve but not close
509 spdc_pen_finish(pc, FALSE);
510 }
512 ret = TRUE;
513 }
514 }
516 return ret;
517 }
519 /**
520 * Handle motion_notify event.
521 */
522 static gint
523 pen_handle_motion_notify(SPPenContext *const pc, GdkEventMotion const &mevent)
524 {
525 gint ret = FALSE;
527 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
529 if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
530 // allow scrolling
531 return FALSE;
532 }
534 if (pc->events_disabled) {
535 // skip motion events if pen events are disabled
536 return FALSE;
537 }
539 NR::Point const event_w(mevent.x,
540 mevent.y);
541 if (pen_within_tolerance) {
542 gint const tolerance = prefs_get_int_attribute_limited("options.dragtolerance",
543 "value", 0, 0, 100);
544 if ( NR::LInfty( event_w - pen_drag_origin_w ) < tolerance ) {
545 return FALSE; // Do not drag if we're within tolerance from origin.
546 }
547 }
548 // Once the user has moved farther than tolerance from the original location
549 // (indicating they intend to move the object, not click), then always process the
550 // motion notify coordinates as given (no snapping back to origin)
551 pen_within_tolerance = false;
553 SPDesktop *const dt = pc->desktop;
554 if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab ) {
555 /* Grab mouse, so release will not pass unnoticed */
556 pc->grab = SP_CANVAS_ITEM(dt->acetate);
557 sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
558 GDK_BUTTON_RELEASE_MASK |
559 GDK_POINTER_MOTION_MASK ),
560 NULL, mevent.time);
561 }
563 /* Find desktop coordinates */
564 NR::Point p = dt->w2d(event_w);
566 /* Test, whether we hit any anchor */
567 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
569 switch (pc->mode) {
570 case SP_PEN_CONTEXT_MODE_CLICK:
571 switch (pc->state) {
572 case SP_PEN_CONTEXT_POINT:
573 if ( pc->npoints != 0 ) {
574 /* Only set point, if we are already appending */
575 spdc_endpoint_snap(pc, p, mevent.state);
576 spdc_pen_set_subsequent_point(pc, p, true);
577 ret = TRUE;
578 }
579 break;
580 case SP_PEN_CONTEXT_CONTROL:
581 case SP_PEN_CONTEXT_CLOSE:
582 /* Placing controls is last operation in CLOSE state */
583 spdc_endpoint_snap(pc, p, mevent.state);
584 spdc_pen_set_ctrl(pc, p, mevent.state);
585 ret = TRUE;
586 break;
587 case SP_PEN_CONTEXT_STOP:
588 /* This is perfectly valid */
589 break;
590 default:
591 break;
592 }
593 break;
594 case SP_PEN_CONTEXT_MODE_DRAG:
595 switch (pc->state) {
596 case SP_PEN_CONTEXT_POINT:
597 if ( pc->npoints > 0 ) {
598 /* Only set point, if we are already appending */
600 if (!anchor) { /* Snap node only if not hitting anchor */
601 spdc_endpoint_snap(pc, p, mevent.state);
602 }
604 spdc_pen_set_subsequent_point(pc, p, !anchor);
606 if (anchor && !pc->anchor_statusbar) {
607 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to close and finish the path."));
608 pc->anchor_statusbar = true;
609 } else if (!anchor && pc->anchor_statusbar) {
610 pc->_message_context->clear();
611 pc->anchor_statusbar = false;
612 }
614 ret = TRUE;
615 } else {
616 if (anchor && !pc->anchor_statusbar) {
617 pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Click</b> or <b>click and drag</b> to continue the path from this point."));
618 pc->anchor_statusbar = true;
619 } else if (!anchor && pc->anchor_statusbar) {
620 pc->_message_context->clear();
621 pc->anchor_statusbar = false;
622 }
623 }
624 break;
625 case SP_PEN_CONTEXT_CONTROL:
626 case SP_PEN_CONTEXT_CLOSE:
627 /* Placing controls is last operation in CLOSE state */
629 // snap the handle
630 spdc_endpoint_snap_handle(pc, p, mevent.state);
632 if (!pc->polylines_only) {
633 spdc_pen_set_ctrl(pc, p, mevent.state);
634 } else {
635 spdc_pen_set_ctrl(pc, pc->p[1], mevent.state);
636 }
637 gobble_motion_events(GDK_BUTTON1_MASK);
638 ret = TRUE;
639 break;
640 case SP_PEN_CONTEXT_STOP:
641 /* This is perfectly valid */
642 break;
643 default:
644 break;
645 }
646 break;
647 default:
648 break;
649 }
650 return ret;
651 }
653 /**
654 * Handle mouse button release event.
655 */
656 static gint
657 pen_handle_button_release(SPPenContext *const pc, GdkEventButton const &revent)
658 {
659 if (pc->events_disabled) {
660 // skip event processing if events are disabled
661 return FALSE;
662 }
664 gint ret = FALSE;
665 SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
666 if ( revent.button == 1 && !event_context->space_panning) {
668 SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
670 NR::Point const event_w(revent.x,
671 revent.y);
672 /* Find desktop coordinates */
673 NR::Point p = pc->desktop->w2d(event_w);
675 /* Test whether we hit any anchor. */
676 SPDrawAnchor *anchor = spdc_test_inside(pc, event_w);
678 switch (pc->mode) {
679 case SP_PEN_CONTEXT_MODE_CLICK:
680 switch (pc->state) {
681 case SP_PEN_CONTEXT_POINT:
682 if ( pc->npoints == 0 ) {
683 /* Start new thread only with button release */
684 if (anchor) {
685 p = anchor->dp;
686 }
687 pc->sa = anchor;
688 spdc_pen_set_initial_point(pc, p);
689 } else {
690 /* Set end anchor here */
691 pc->ea = anchor;
692 if (anchor) {
693 p = anchor->dp;
694 }
695 }
696 pc->state = SP_PEN_CONTEXT_CONTROL;
697 ret = TRUE;
698 break;
699 case SP_PEN_CONTEXT_CONTROL:
700 /* End current segment */
701 spdc_endpoint_snap(pc, p, revent.state);
702 spdc_pen_finish_segment(pc, p, revent.state);
703 pc->state = SP_PEN_CONTEXT_POINT;
704 ret = TRUE;
705 break;
706 case SP_PEN_CONTEXT_CLOSE:
707 /* End current segment */
708 if (!anchor) { /* Snap node only if not hitting anchor */
709 spdc_endpoint_snap(pc, p, revent.state);
710 }
711 spdc_pen_finish_segment(pc, p, revent.state);
712 spdc_pen_finish(pc, TRUE);
713 pc->state = SP_PEN_CONTEXT_POINT;
714 ret = TRUE;
715 break;
716 case SP_PEN_CONTEXT_STOP:
717 /* This is allowed, if we just cancelled curve */
718 pc->state = SP_PEN_CONTEXT_POINT;
719 ret = TRUE;
720 break;
721 default:
722 break;
723 }
724 break;
725 case SP_PEN_CONTEXT_MODE_DRAG:
726 switch (pc->state) {
727 case SP_PEN_CONTEXT_POINT:
728 case SP_PEN_CONTEXT_CONTROL:
729 if (!pc->polylines_only) {
730 spdc_endpoint_snap(pc, p, revent.state);
731 spdc_pen_finish_segment(pc, p, revent.state);
732 }
733 break;
734 case SP_PEN_CONTEXT_CLOSE:
735 spdc_endpoint_snap(pc, p, revent.state);
736 spdc_pen_finish_segment(pc, p, revent.state);
737 if (pc->green_closed) {
738 // finishing at the start anchor, close curve
739 spdc_pen_finish(pc, TRUE);
740 } else {
741 // finishing at some other anchor, finish curve but not close
742 spdc_pen_finish(pc, FALSE);
743 }
744 break;
745 case SP_PEN_CONTEXT_STOP:
746 /* This is allowed, if we just cancelled curve */
747 break;
748 default:
749 break;
750 }
751 pc->state = SP_PEN_CONTEXT_POINT;
752 ret = TRUE;
753 break;
754 default:
755 break;
756 }
758 if (pc->grab) {
759 /* Release grab now */
760 sp_canvas_item_ungrab(pc->grab, revent.time);
761 pc->grab = NULL;
762 }
764 ret = TRUE;
766 dc->green_closed = FALSE;
767 }
769 return ret;
770 }
772 static gint
773 pen_handle_2button_press(SPPenContext *const pc, GdkEventButton const &bevent)
774 {
775 gint ret = FALSE;
776 if (pc->npoints != 0 && bevent.button != 2) {
777 spdc_pen_finish(pc, FALSE);
778 ret = TRUE;
779 }
780 return ret;
781 }
783 void
784 pen_redraw_all (SPPenContext *const pc)
785 {
786 // green
787 if (pc->green_bpaths) {
788 // remove old piecewise green canvasitems
789 while (pc->green_bpaths) {
790 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
791 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
792 }
793 // one canvas bpath for all of green_curve
794 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), pc->green_curve);
795 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
796 sp_canvas_bpath_set_fill(SP_CANVAS_BPATH(cshape), 0, SP_WIND_RULE_NONZERO);
798 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
799 }
801 if (pc->green_anchor)
802 SP_CTRL(pc->green_anchor->ctrl)->moveto(pc->green_anchor->dp);
804 pc->red_curve->reset();
805 pc->red_curve->moveto(pc->p[0]);
806 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
807 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
809 // handles
810 if (pc->p[0] != pc->p[1]) {
811 SP_CTRL(pc->c1)->moveto(pc->p[1]);
812 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
813 sp_canvas_item_show (pc->c1);
814 sp_canvas_item_show (pc->cl1);
815 } else {
816 sp_canvas_item_hide (pc->c1);
817 sp_canvas_item_hide (pc->cl1);
818 }
820 NArtBpath const * bpath = pc->green_curve->last_bpath();
821 if (bpath) {
822 if (bpath->code == NR_CURVETO && NR::Point(bpath->x2, bpath->y2) != pc->p[0]) {
823 SP_CTRL(pc->c0)->moveto(NR::Point(bpath->x2, bpath->y2));
824 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), NR::Point(bpath->x2, bpath->y2), pc->p[0]);
825 sp_canvas_item_show (pc->c0);
826 sp_canvas_item_show (pc->cl0);
827 } else {
828 sp_canvas_item_hide (pc->c0);
829 sp_canvas_item_hide (pc->cl0);
830 }
831 }
832 }
834 void
835 pen_lastpoint_move (SPPenContext *const pc, gdouble x, gdouble y)
836 {
837 if (pc->npoints != 5)
838 return;
840 // green
841 NArtBpath const * bpath = pc->green_curve->last_bpath();
842 if (bpath) {
843 pc->green_curve->last_point_additive_move( Geom::Point(x,y) );
844 } else {
845 // start anchor too
846 if (pc->green_anchor) {
847 pc->green_anchor->dp += NR::Point(x, y);
848 }
849 }
851 // red
852 pc->p[0] += NR::Point(x, y);
853 pc->p[1] += NR::Point(x, y);
854 pen_redraw_all(pc);
855 }
857 void
858 pen_lastpoint_move_screen (SPPenContext *const pc, gdouble x, gdouble y)
859 {
860 pen_lastpoint_move (pc, x / pc->desktop->current_zoom(), y / pc->desktop->current_zoom());
861 }
863 void
864 pen_lastpoint_tocurve (SPPenContext *const pc)
865 {
866 if (pc->npoints != 5)
867 return;
869 // red
870 NArtBpath const * bpath = pc->green_curve->last_bpath();
871 if (bpath && bpath->code == NR_CURVETO) {
872 pc->p[1] = pc->p[0] + (NR::Point(bpath->x3, bpath->y3) - NR::Point(bpath->x2, bpath->y2));
873 } else {
874 pc->p[1] = pc->p[0] + (1./3)*(pc->p[3] - pc->p[0]);
875 }
877 pen_redraw_all(pc);
878 }
880 void
881 pen_lastpoint_toline (SPPenContext *const pc)
882 {
883 if (pc->npoints != 5)
884 return;
886 pc->p[1] = pc->p[0];
888 pen_redraw_all(pc);
889 }
892 static gint
893 pen_handle_key_press(SPPenContext *const pc, GdkEvent *event)
894 {
895 gint ret = FALSE;
896 gdouble const nudge = prefs_get_double_attribute_limited("options.nudgedistance", "value", 2, 0, 1000); // in px
898 switch (get_group0_keyval (&event->key)) {
900 case GDK_Left: // move last point left
901 case GDK_KP_Left:
902 case GDK_KP_4:
903 if (!MOD__CTRL) { // not ctrl
904 if (MOD__ALT) { // alt
905 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, -10, 0); // shift
906 else pen_lastpoint_move_screen(pc, -1, 0); // no shift
907 }
908 else { // no alt
909 if (MOD__SHIFT) pen_lastpoint_move(pc, -10*nudge, 0); // shift
910 else pen_lastpoint_move(pc, -nudge, 0); // no shift
911 }
912 ret = TRUE;
913 }
914 break;
915 case GDK_Up: // move last point up
916 case GDK_KP_Up:
917 case GDK_KP_8:
918 if (!MOD__CTRL) { // not ctrl
919 if (MOD__ALT) { // alt
920 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, 10); // shift
921 else pen_lastpoint_move_screen(pc, 0, 1); // no shift
922 }
923 else { // no alt
924 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, 10*nudge); // shift
925 else pen_lastpoint_move(pc, 0, nudge); // no shift
926 }
927 ret = TRUE;
928 }
929 break;
930 case GDK_Right: // move last point right
931 case GDK_KP_Right:
932 case GDK_KP_6:
933 if (!MOD__CTRL) { // not ctrl
934 if (MOD__ALT) { // alt
935 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 10, 0); // shift
936 else pen_lastpoint_move_screen(pc, 1, 0); // no shift
937 }
938 else { // no alt
939 if (MOD__SHIFT) pen_lastpoint_move(pc, 10*nudge, 0); // shift
940 else pen_lastpoint_move(pc, nudge, 0); // no shift
941 }
942 ret = TRUE;
943 }
944 break;
945 case GDK_Down: // move last point down
946 case GDK_KP_Down:
947 case GDK_KP_2:
948 if (!MOD__CTRL) { // not ctrl
949 if (MOD__ALT) { // alt
950 if (MOD__SHIFT) pen_lastpoint_move_screen(pc, 0, -10); // shift
951 else pen_lastpoint_move_screen(pc, 0, -1); // no shift
952 }
953 else { // no alt
954 if (MOD__SHIFT) pen_lastpoint_move(pc, 0, -10*nudge); // shift
955 else pen_lastpoint_move(pc, 0, -nudge); // no shift
956 }
957 ret = TRUE;
958 }
959 break;
961 case GDK_U:
962 case GDK_u:
963 if (MOD__SHIFT_ONLY) {
964 pen_lastpoint_tocurve(pc);
965 ret = TRUE;
966 }
967 break;
968 case GDK_L:
969 case GDK_l:
970 if (MOD__SHIFT_ONLY) {
971 pen_lastpoint_toline(pc);
972 ret = TRUE;
973 }
974 break;
976 case GDK_Return:
977 case GDK_KP_Enter:
978 if (pc->npoints != 0) {
979 spdc_pen_finish(pc, FALSE);
980 ret = TRUE;
981 }
982 break;
983 case GDK_Escape:
984 if (pc->npoints != 0) {
985 // if drawing, cancel, otherwise pass it up for deselecting
986 pen_cancel (pc);
987 ret = TRUE;
988 }
989 break;
990 case GDK_z:
991 case GDK_Z:
992 if (MOD__CTRL_ONLY && pc->npoints != 0) {
993 // if drawing, cancel, otherwise pass it up for undo
994 pen_cancel (pc);
995 ret = TRUE;
996 }
997 break;
998 case GDK_g:
999 case GDK_G:
1000 if (MOD__SHIFT_ONLY) {
1001 sp_selection_to_guides();
1002 ret = true;
1003 }
1004 break;
1005 case GDK_BackSpace:
1006 case GDK_Delete:
1007 case GDK_KP_Delete:
1008 if (pc->green_curve->is_empty()) {
1009 if (!pc->red_curve->is_empty()) {
1010 pen_cancel (pc);
1011 ret = TRUE;
1012 } else {
1013 // do nothing; this event should be handled upstream
1014 }
1015 } else {
1016 /* Reset red curve */
1017 pc->red_curve->reset();
1018 /* Destroy topmost green bpath */
1019 if (pc->green_bpaths) {
1020 if (pc->green_bpaths->data)
1021 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1022 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1023 }
1024 /* Get last segment */
1025 NArtBpath const *const p = SP_CURVE_BPATH(pc->green_curve);
1026 gint const e = SP_CURVE_LENGTH(pc->green_curve);
1027 if ( e < 2 ) {
1028 g_warning("Green curve length is %d", e);
1029 break;
1030 }
1031 pc->p[0] = p[e - 2].c(3);
1032 if (p[e - 1].code == NR_CURVETO) {
1033 pc->p[1] = p[e - 1].c(1);
1034 } else {
1035 pc->p[1] = pc->p[0];
1036 }
1037 NR::Point const pt(( pc->npoints < 4
1038 ? p[e - 1].c(3)
1039 : pc->p[3] ));
1040 pc->npoints = 2;
1041 pc->green_curve->backspace();
1042 sp_canvas_item_hide(pc->c0);
1043 sp_canvas_item_hide(pc->c1);
1044 sp_canvas_item_hide(pc->cl0);
1045 sp_canvas_item_hide(pc->cl1);
1046 pc->state = SP_PEN_CONTEXT_POINT;
1047 spdc_pen_set_subsequent_point(pc, pt, true);
1048 ret = TRUE;
1049 }
1050 break;
1051 default:
1052 break;
1053 }
1054 return ret;
1055 }
1057 static void
1058 spdc_reset_colors(SPPenContext *pc)
1059 {
1060 /* Red */
1061 pc->red_curve->reset();
1062 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1063 /* Blue */
1064 pc->blue_curve->reset();
1065 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->blue_bpath), NULL);
1066 /* Green */
1067 while (pc->green_bpaths) {
1068 gtk_object_destroy(GTK_OBJECT(pc->green_bpaths->data));
1069 pc->green_bpaths = g_slist_remove(pc->green_bpaths, pc->green_bpaths->data);
1070 }
1071 pc->green_curve->reset();
1072 if (pc->green_anchor) {
1073 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1074 }
1075 pc->sa = NULL;
1076 pc->ea = NULL;
1077 pc->npoints = 0;
1078 pc->red_curve_is_valid = false;
1079 }
1082 static void
1083 spdc_pen_set_initial_point(SPPenContext *const pc, NR::Point const p)
1084 {
1085 g_assert( pc->npoints == 0 );
1087 pc->p[0] = p;
1088 pc->p[1] = p;
1089 pc->npoints = 2;
1090 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), NULL);
1092 sp_canvas_force_full_redraw_after_interruptions(pc->desktop->canvas, 5);
1093 }
1095 /**
1096 * Show the status message for the current line/curve segment.
1097 * This type of message always shows angle/distance as the last
1098 * two parameters ("angle %3.2f°, distance %s").
1099 */
1100 static void
1101 spdc_pen_set_angle_distance_status_message(SPPenContext *const pc, NR::Point const p, int pc_point_to_compare, gchar const *message)
1102 {
1103 g_assert(pc != NULL);
1104 g_assert((pc_point_to_compare == 0) || (pc_point_to_compare == 3)); // exclude control handles
1105 g_assert(message != NULL);
1107 SPDesktop *desktop = SP_EVENT_CONTEXT(pc)->desktop;
1108 NR::Point rel = p - pc->p[pc_point_to_compare];
1109 GString *dist = SP_PX_TO_METRIC_STRING(NR::L2(rel), desktop->namedview->getDefaultMetric());
1110 double angle = atan2(rel[NR::Y], rel[NR::X]) * 180 / M_PI;
1111 if (prefs_get_int_attribute("options.compassangledisplay", "value", 0) != 0)
1112 angle = angle_to_compass (angle);
1114 pc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, message, angle, dist->str);
1115 g_string_free(dist, FALSE);
1116 }
1118 static void
1119 spdc_pen_set_subsequent_point(SPPenContext *const pc, NR::Point const p, bool statusbar)
1120 {
1121 g_assert( pc->npoints != 0 );
1122 /* todo: Check callers to see whether 2 <= npoints is guaranteed. */
1124 pc->p[2] = p;
1125 pc->p[3] = p;
1126 pc->p[4] = p;
1127 pc->npoints = 5;
1128 pc->red_curve->reset();
1129 pc->red_curve->moveto(pc->p[0]);
1130 bool is_curve;
1131 if (pc->p[1] != pc->p[0])
1132 {
1133 pc->red_curve->curveto(pc->p[1], p, p);
1134 is_curve = true;
1135 } else {
1136 pc->red_curve->lineto(p);
1137 is_curve = false;
1138 }
1140 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1142 if (statusbar) {
1143 gchar *message = is_curve ?
1144 _("<b>Curve segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path" ):
1145 _("<b>Line segment</b>: angle %3.2f°, distance %s; with <b>Ctrl</b> to snap angle, <b>Enter</b> to finish the path");
1146 spdc_pen_set_angle_distance_status_message(pc, p, 0, message);
1147 }
1148 }
1150 static void
1151 spdc_pen_set_ctrl(SPPenContext *const pc, NR::Point const p, guint const state)
1152 {
1153 sp_canvas_item_show(pc->c1);
1154 sp_canvas_item_show(pc->cl1);
1156 if ( pc->npoints == 2 ) {
1157 pc->p[1] = p;
1158 sp_canvas_item_hide(pc->c0);
1159 sp_canvas_item_hide(pc->cl0);
1160 SP_CTRL(pc->c1)->moveto(pc->p[1]);
1161 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[0], pc->p[1]);
1163 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"));
1164 } else if ( pc->npoints == 5 ) {
1165 pc->p[4] = p;
1166 sp_canvas_item_show(pc->c0);
1167 sp_canvas_item_show(pc->cl0);
1168 bool is_symm = false;
1169 if ( ( ( pc->mode == SP_PEN_CONTEXT_MODE_CLICK ) && ( state & GDK_CONTROL_MASK ) ) ||
1170 ( ( pc->mode == SP_PEN_CONTEXT_MODE_DRAG ) && !( state & GDK_SHIFT_MASK ) ) ) {
1171 NR::Point delta = p - pc->p[3];
1172 pc->p[2] = pc->p[3] - delta;
1173 is_symm = true;
1174 pc->red_curve->reset();
1175 pc->red_curve->moveto(pc->p[0]);
1176 pc->red_curve->curveto(pc->p[1], pc->p[2], pc->p[3]);
1177 sp_canvas_bpath_set_bpath(SP_CANVAS_BPATH(pc->red_bpath), pc->red_curve);
1178 }
1179 SP_CTRL(pc->c0)->moveto(pc->p[2]);
1180 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl0), pc->p[3], pc->p[2]);
1181 SP_CTRL(pc->c1)->moveto(pc->p[4]);
1182 sp_ctrlline_set_coords(SP_CTRLLINE(pc->cl1), pc->p[3], pc->p[4]);
1184 gchar *message = is_symm ?
1185 _("<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") :
1186 _("<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");
1187 spdc_pen_set_angle_distance_status_message(pc, p, 3, message);
1188 } else {
1189 g_warning("Something bad happened - npoints is %d", pc->npoints);
1190 }
1191 }
1193 static void
1194 spdc_pen_finish_segment(SPPenContext *const pc, NR::Point const /*p*/, guint const /*state*/)
1195 {
1196 if (!pc->red_curve->is_empty()) {
1197 pc->green_curve->append_continuous(pc->red_curve, 0.0625);
1198 SPCurve *curve = pc->red_curve->copy();
1199 /// \todo fixme:
1200 SPCanvasItem *cshape = sp_canvas_bpath_new(sp_desktop_sketch(pc->desktop), curve);
1201 curve->unref();
1202 sp_canvas_bpath_set_stroke(SP_CANVAS_BPATH(cshape), pc->green_color, 1.0, SP_STROKE_LINEJOIN_MITER, SP_STROKE_LINECAP_BUTT);
1204 pc->green_bpaths = g_slist_prepend(pc->green_bpaths, cshape);
1206 pc->p[0] = pc->p[3];
1207 pc->p[1] = pc->p[4];
1208 pc->npoints = 2;
1210 pc->red_curve->reset();
1211 }
1212 }
1214 static void
1215 spdc_pen_finish(SPPenContext *const pc, gboolean const closed)
1216 {
1217 pen_disable_events(pc);
1219 SPDesktop *const desktop = pc->desktop;
1220 pc->_message_context->clear();
1221 desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Drawing finished"));
1223 pc->red_curve->reset();
1224 spdc_concat_colors_and_flush(pc, closed);
1225 pc->sa = NULL;
1226 pc->ea = NULL;
1228 pc->npoints = 0;
1229 pc->state = SP_PEN_CONTEXT_POINT;
1231 sp_canvas_item_hide(pc->c0);
1232 sp_canvas_item_hide(pc->c1);
1233 sp_canvas_item_hide(pc->cl0);
1234 sp_canvas_item_hide(pc->cl1);
1236 if (pc->green_anchor) {
1237 pc->green_anchor = sp_draw_anchor_destroy(pc->green_anchor);
1238 }
1241 sp_canvas_end_forced_full_redraws(pc->desktop->canvas);
1243 pen_enable_events(pc);
1244 }
1246 static void
1247 pen_disable_events(SPPenContext *const pc) {
1248 pc->events_disabled++;
1249 }
1251 static void
1252 pen_enable_events(SPPenContext *const pc) {
1253 g_return_if_fail(pc->events_disabled != 0);
1255 pc->events_disabled--;
1256 }
1258 /*
1259 Local Variables:
1260 mode:c++
1261 c-file-style:"stroustrup"
1262 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1263 indent-tabs-mode:nil
1264 fill-column:99
1265 End:
1266 */
1267 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :