1 #define __SP_STAR_CONTEXT_C__
3 /*
4 * Star drawing context
5 *
6 * Authors:
7 * Mitsuru Oka <oka326@parkcity.ne.jp>
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 1999-2002 Lauris Kaplinski
12 * Copyright (C) 2001-2002 Mitsuru Oka
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 */
17 #ifdef HAVE_CONFIG_H
18 # include "config.h"
19 #endif
21 #include <cstring>
22 #include <string>
24 #include <gdk/gdkkeysyms.h>
26 #include "macros.h"
27 #include "display/sp-canvas.h"
28 #include "sp-star.h"
29 #include "document.h"
30 #include "sp-namedview.h"
31 #include "selection.h"
32 #include "desktop-handles.h"
33 #include "snap.h"
34 #include "desktop.h"
35 #include "desktop-style.h"
36 #include "message-context.h"
37 #include "libnr/nr-macros.h"
38 #include "pixmaps/cursor-star.xpm"
39 #include "sp-metrics.h"
40 #include <glibmm/i18n.h>
41 #include "preferences.h"
42 #include "xml/repr.h"
43 #include "xml/node-event-vector.h"
44 #include "object-edit.h"
45 #include "context-fns.h"
46 #include "shape-editor.h"
48 #include "star-context.h"
50 static void sp_star_context_class_init (SPStarContextClass * klass);
51 static void sp_star_context_init (SPStarContext * star_context);
52 static void sp_star_context_dispose (GObject *object);
54 static void sp_star_context_setup (SPEventContext *ec);
55 static void sp_star_context_finish(SPEventContext *ec);
56 static void sp_star_context_set (SPEventContext *ec, Inkscape::Preferences::Entry *val);
57 static gint sp_star_context_root_handler (SPEventContext *ec, GdkEvent *event);
59 static void sp_star_drag (SPStarContext * sc, Geom::Point p, guint state);
60 static void sp_star_finish (SPStarContext * sc);
61 static void sp_star_cancel(SPStarContext * sc);
63 static SPEventContextClass * parent_class;
65 GtkType
66 sp_star_context_get_type (void)
67 {
68 static GType type = 0;
69 if (!type) {
70 GTypeInfo info = {
71 sizeof (SPStarContextClass),
72 NULL, NULL,
73 (GClassInitFunc) sp_star_context_class_init,
74 NULL, NULL,
75 sizeof (SPStarContext),
76 4,
77 (GInstanceInitFunc) sp_star_context_init,
78 NULL, /* value_table */
79 };
80 type = g_type_register_static (SP_TYPE_EVENT_CONTEXT, "SPStarContext", &info, (GTypeFlags)0);
81 }
82 return type;
83 }
85 static void
86 sp_star_context_class_init (SPStarContextClass * klass)
87 {
88 GObjectClass *object_class = (GObjectClass *) klass;
89 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
91 parent_class = (SPEventContextClass*)g_type_class_peek_parent (klass);
93 object_class->dispose = sp_star_context_dispose;
95 event_context_class->setup = sp_star_context_setup;
96 event_context_class->finish = sp_star_context_finish;
97 event_context_class->set = sp_star_context_set;
98 event_context_class->root_handler = sp_star_context_root_handler;
99 }
101 static void
102 sp_star_context_init (SPStarContext * star_context)
103 {
104 SPEventContext *event_context = SP_EVENT_CONTEXT (star_context);
106 event_context->cursor_shape = cursor_star_xpm;
107 event_context->hot_x = 4;
108 event_context->hot_y = 4;
109 event_context->xp = 0;
110 event_context->yp = 0;
111 event_context->tolerance = 0;
112 event_context->within_tolerance = false;
113 event_context->item_to_select = NULL;
114 event_context->tool_url = "/tools/shapes/star";
116 star_context->item = NULL;
118 star_context->magnitude = 5;
119 star_context->proportion = 0.5;
120 star_context->isflatsided = false;
122 new (&star_context->sel_changed_connection) sigc::connection();
123 }
125 static void sp_star_context_finish(SPEventContext *ec)
126 {
127 SPStarContext *sc = SP_STAR_CONTEXT(ec);
128 SPDesktop *desktop = ec->desktop;
130 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), GDK_CURRENT_TIME);
131 sp_star_finish(sc);
132 sc->sel_changed_connection.disconnect();
134 if (((SPEventContextClass *) parent_class)->finish) {
135 ((SPEventContextClass *) parent_class)->finish(ec);
136 }
137 }
140 static void
141 sp_star_context_dispose (GObject *object)
142 {
143 SPEventContext *ec = SP_EVENT_CONTEXT (object);
144 SPStarContext *sc = SP_STAR_CONTEXT (object);
146 ec->enableGrDrag(false);
148 sc->sel_changed_connection.disconnect();
149 sc->sel_changed_connection.~connection();
151 delete ec->shape_editor;
152 ec->shape_editor = NULL;
154 /* fixme: This is necessary because we do not grab */
155 if (sc->item) sp_star_finish (sc);
157 if (sc->_message_context) {
158 delete sc->_message_context;
159 }
161 G_OBJECT_CLASS (parent_class)->dispose (object);
162 }
164 /**
165 \brief Callback that processes the "changed" signal on the selection;
166 destroys old and creates new knotholder
167 \param selection Should not be NULL.
168 */
169 void
170 sp_star_context_selection_changed (Inkscape::Selection * selection, gpointer data)
171 {
172 g_assert (selection != NULL);
174 SPStarContext *sc = SP_STAR_CONTEXT (data);
175 SPEventContext *ec = SP_EVENT_CONTEXT (sc);
177 ec->shape_editor->unset_item(SH_KNOTHOLDER);
178 SPItem *item = selection->singleItem();
179 ec->shape_editor->set_item(item, SH_KNOTHOLDER);
180 }
182 static void
183 sp_star_context_setup (SPEventContext *ec)
184 {
185 SPStarContext *sc = SP_STAR_CONTEXT (ec);
187 if (((SPEventContextClass *) parent_class)->setup)
188 ((SPEventContextClass *) parent_class)->setup (ec);
190 sp_event_context_read (ec, "magnitude");
191 sp_event_context_read (ec, "proportion");
192 sp_event_context_read (ec, "isflatsided");
193 sp_event_context_read (ec, "rounded");
194 sp_event_context_read (ec, "randomized");
196 ec->shape_editor = new ShapeEditor(ec->desktop);
198 SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
199 if (item) {
200 ec->shape_editor->set_item(item, SH_KNOTHOLDER);
201 }
203 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
204 sc->sel_changed_connection.disconnect();
205 sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_star_context_selection_changed), (gpointer)sc));
207 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
208 if (prefs->getBool("/tools/shapes/selcue")) {
209 ec->enableSelectionCue();
210 }
212 if (prefs->getBool("/tools/shapes/gradientdrag")) {
213 ec->enableGrDrag();
214 }
216 sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
217 }
219 static void
220 sp_star_context_set (SPEventContext *ec, Inkscape::Preferences::Entry *val)
221 {
222 SPStarContext *sc = SP_STAR_CONTEXT (ec);
223 Glib::ustring path = val->getEntryName();
225 if (path == "magnitude") {
226 sc->magnitude = NR_CLAMP(val->getInt(5), 3, 1024);
227 } else if (path == "proportion") {
228 sc->proportion = NR_CLAMP(val->getDouble(0.5), 0.01, 2.0);
229 } else if (path == "isflatsided") {
230 sc->isflatsided = val->getBool();
231 } else if (path == "rounded") {
232 sc->rounded = val->getDouble();
233 } else if (path == "randomized") {
234 sc->randomized = val->getDouble();
235 }
236 }
238 static gint sp_star_context_root_handler(SPEventContext *event_context, GdkEvent *event)
239 {
240 static gboolean dragging;
242 SPDesktop *desktop = event_context->desktop;
243 Inkscape::Selection *selection = sp_desktop_selection (desktop);
244 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
246 SPStarContext *sc = SP_STAR_CONTEXT (event_context);
248 event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
250 gint ret = FALSE;
252 switch (event->type) {
253 case GDK_BUTTON_PRESS:
254 if (event->button.button == 1 && !event_context->space_panning) {
256 dragging = TRUE;
258 sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
260 /* Snap center */
261 SnapManager &m = desktop->namedview->snap_manager;
262 m.setup(desktop, true);
263 m.freeSnapReturnByRef(sc->center, Inkscape::SNAPSOURCE_NODE_HANDLE);
264 m.unSetup();
265 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
266 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
267 GDK_POINTER_MOTION_MASK |
268 GDK_POINTER_MOTION_HINT_MASK |
269 GDK_BUTTON_PRESS_MASK,
270 NULL, event->button.time);
271 ret = TRUE;
272 }
273 break;
274 case GDK_MOTION_NOTIFY:
275 if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
277 if ( event_context->within_tolerance
278 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
279 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
280 break; // do not drag if we're within tolerance from origin
281 }
282 // Once the user has moved farther than tolerance from the original location
283 // (indicating they intend to draw, not click), then always process the
284 // motion notify coordinates as given (no snapping back to origin)
285 event_context->within_tolerance = false;
287 Geom::Point const motion_w(event->motion.x, event->motion.y);
288 Geom::Point motion_dt(desktop->w2d(motion_w));
290 sp_star_drag (sc, motion_dt, event->motion.state);
292 gobble_motion_events(GDK_BUTTON1_MASK);
294 ret = TRUE;
295 } else if (!sp_event_context_knot_mouseover(event_context)) {
296 SnapManager &m = desktop->namedview->snap_manager;
297 m.setup(desktop);
299 Geom::Point const motion_w(event->motion.x, event->motion.y);
300 Geom::Point motion_dt(desktop->w2d(motion_w));
302 m.preSnap(Inkscape::SnapCandidatePoint(motion_dt, Inkscape::SNAPSOURCE_NODE_HANDLE));
303 m.unSetup();
304 }
305 break;
306 case GDK_BUTTON_RELEASE:
307 event_context->xp = event_context->yp = 0;
308 if (event->button.button == 1 && !event_context->space_panning) {
309 dragging = FALSE;
310 sp_event_context_discard_delayed_snap_event(event_context);
311 if (!event_context->within_tolerance) {
312 // we've been dragging, finish the star
313 sp_star_finish (sc);
314 } else if (event_context->item_to_select) {
315 // no dragging, select clicked item if any
316 if (event->button.state & GDK_SHIFT_MASK) {
317 selection->toggle(event_context->item_to_select);
318 } else {
319 selection->set(event_context->item_to_select);
320 }
321 } else {
322 // click in an empty space
323 selection->clear();
324 }
326 event_context->item_to_select = NULL;
327 ret = TRUE;
328 sp_canvas_item_ungrab(SP_CANVAS_ITEM (desktop->acetate), event->button.time);
329 }
330 break;
331 case GDK_KEY_PRESS:
332 switch (get_group0_keyval(&event->key)) {
333 case GDK_Alt_R:
334 case GDK_Control_L:
335 case GDK_Control_R:
336 case GDK_Shift_L:
337 case GDK_Shift_R:
338 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
339 case GDK_Meta_R:
340 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
341 _("<b>Ctrl</b>: snap angle; keep rays radial"),
342 NULL,
343 NULL);
344 break;
345 case GDK_Up:
346 case GDK_Down:
347 case GDK_KP_Up:
348 case GDK_KP_Down:
349 // prevent the zoom field from activation
350 if (!MOD__CTRL_ONLY)
351 ret = TRUE;
352 break;
353 case GDK_x:
354 case GDK_X:
355 if (MOD__ALT_ONLY) {
356 desktop->setToolboxFocusTo ("altx-star");
357 ret = TRUE;
358 }
359 break;
360 case GDK_Escape:
361 if (dragging) {
362 dragging = false;
363 sp_event_context_discard_delayed_snap_event(event_context);
364 // if drawing, cancel, otherwise pass it up for deselecting
365 sp_star_cancel(sc);
366 ret = TRUE;
367 }
368 break;
369 case GDK_space:
370 if (dragging) {
371 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
372 event->button.time);
373 dragging = false;
374 sp_event_context_discard_delayed_snap_event(event_context);
375 if (!event_context->within_tolerance) {
376 // we've been dragging, finish the star
377 sp_star_finish(sc);
378 }
379 // do not return true, so that space would work switching to selector
380 }
381 break;
383 default:
384 break;
385 }
386 break;
387 case GDK_KEY_RELEASE:
388 switch (get_group0_keyval (&event->key)) {
389 case GDK_Alt_L:
390 case GDK_Alt_R:
391 case GDK_Control_L:
392 case GDK_Control_R:
393 case GDK_Shift_L:
394 case GDK_Shift_R:
395 case GDK_Meta_L: // Meta is when you press Shift+Alt
396 case GDK_Meta_R:
397 event_context->defaultMessageContext()->clear();
398 break;
399 default:
400 break;
401 }
402 break;
403 default:
404 break;
405 }
407 if (!ret) {
408 if (((SPEventContextClass *) parent_class)->root_handler)
409 ret = ((SPEventContextClass *) parent_class)->root_handler (event_context, event);
410 }
412 return ret;
413 }
415 static void sp_star_drag(SPStarContext *sc, Geom::Point p, guint state)
416 {
417 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
419 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
420 int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
422 if (!sc->item) {
424 if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
425 return;
426 }
428 /* Create object */
429 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
430 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
431 repr->setAttribute("sodipodi:type", "star");
433 /* Set style */
434 sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/star", false);
436 sc->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
437 Inkscape::GC::release(repr);
438 sc->item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
439 sc->item->updateRepr();
441 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
442 }
444 /* Snap corner point with no constraints */
445 SnapManager &m = desktop->namedview->snap_manager;
446 m.setup(desktop, true, sc->item);
447 Geom::Point pt2g = to_2geom(p);
448 m.freeSnapReturnByRef(pt2g, Inkscape::SNAPSOURCE_NODE_HANDLE);
449 m.unSetup();
450 Geom::Point const p0 = desktop->dt2doc(sc->center);
451 Geom::Point const p1 = desktop->dt2doc(pt2g);
453 SPStar *star = SP_STAR(sc->item);
455 double const sides = (gdouble) sc->magnitude;
456 Geom::Point const d = p1 - p0;
457 Geom::Coord const r1 = Geom::L2(d);
458 double arg1 = atan2(from_2geom(d));
460 if (state & GDK_CONTROL_MASK) {
461 /* Snap angle */
462 arg1 = sp_round(arg1, M_PI / snaps);
463 }
465 sp_star_position_set(star, sc->magnitude, from_2geom(p0), r1, r1 * sc->proportion,
466 arg1, arg1 + M_PI / sides, sc->isflatsided, sc->rounded, sc->randomized);
468 /* status text */
469 GString *rads = SP_PX_TO_METRIC_STRING(r1, desktop->namedview->getDefaultMetric());
470 sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
471 ( sc->isflatsided?
472 _("<b>Polygon</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle")
473 : _("<b>Star</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle") ),
474 rads->str, sp_round((arg1) * 180 / M_PI, 0.0001));
476 g_string_free(rads, FALSE);
477 }
479 static void
480 sp_star_finish (SPStarContext * sc)
481 {
482 sc->_message_context->clear();
484 if (sc->item != NULL) {
485 SPStar *star = SP_STAR(sc->item);
486 if (star->r[1] == 0) {
487 sp_star_cancel(sc); // Don't allow the creating of zero sized arc, for example when the start and and point snap to the snap grid point
488 return;
489 }
491 // Set transform center, so that odd stars rotate correctly
492 // LP #462157
493 sc->item->setCenter(sc->center);
495 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
496 SPObject *object = SP_OBJECT(sc->item);
498 sp_shape_set_shape(SP_SHAPE(sc->item));
500 object->updateRepr(SP_OBJECT_WRITE_EXT);
502 sp_canvas_end_forced_full_redraws(desktop->canvas);
504 sp_desktop_selection(desktop)->set(sc->item);
505 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_STAR,
506 _("Create star"));
508 sc->item = NULL;
509 }
510 }
512 static void sp_star_cancel(SPStarContext *sc)
513 {
514 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
516 sp_desktop_selection(desktop)->clear();
517 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), 0);
519 if (sc->item != NULL) {
520 SP_OBJECT(sc->item)->deleteObject();
521 sc->item = NULL;
522 }
524 sc->within_tolerance = false;
525 sc->xp = 0;
526 sc->yp = 0;
527 sc->item_to_select = NULL;
529 sp_canvas_end_forced_full_redraws(desktop->canvas);
531 sp_document_cancel(sp_desktop_document(desktop));
532 }
534 /*
535 Local Variables:
536 mode:c++
537 c-file-style:"stroustrup"
538 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
539 indent-tabs-mode:nil
540 fill-column:99
541 End:
542 */
543 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :