1 /** @file
2 * @brief Ellipse drawing context
3 */
4 /* Authors:
5 * Mitsuru Oka
6 * Lauris Kaplinski <lauris@kaplinski.com>
7 * bulia byak <buliabyak@users.sf.net>
8 * Johan Engelen <johan@shouraizou.nl>
9 *
10 * Copyright (C) 2000-2006 Authors
11 * Copyright (C) 2000-2001 Ximian, Inc.
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 #define __SP_ARC_CONTEXT_C__
18 #ifdef HAVE_CONFIG_H
19 # include <config.h>
20 #endif
21 #include <gdk/gdkkeysyms.h>
23 #include "macros.h"
24 #include <glibmm/i18n.h>
25 #include "display/sp-canvas.h"
26 #include "sp-ellipse.h"
27 #include "document.h"
28 #include "sp-namedview.h"
29 #include "selection.h"
30 #include "desktop-handles.h"
31 #include "snap.h"
32 #include "pixmaps/cursor-ellipse.xpm"
33 #include "sp-metrics.h"
34 #include "xml/repr.h"
35 #include "xml/node-event-vector.h"
36 #include "object-edit.h"
37 #include "preferences.h"
38 #include "message-context.h"
39 #include "desktop.h"
40 #include "desktop-style.h"
41 #include "context-fns.h"
42 #include "verbs.h"
44 #include "arc-context.h"
46 static void sp_arc_context_class_init(SPArcContextClass *klass);
47 static void sp_arc_context_init(SPArcContext *arc_context);
48 static void sp_arc_context_dispose(GObject *object);
50 static void sp_arc_context_setup(SPEventContext *ec);
51 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event);
52 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event);
54 static void sp_arc_drag(SPArcContext *ec, Geom::Point pt, guint state);
55 static void sp_arc_finish(SPArcContext *ec);
57 static SPEventContextClass *parent_class;
59 GtkType sp_arc_context_get_type()
60 {
61 static GType type = 0;
62 if (!type) {
63 GTypeInfo info = {
64 sizeof(SPArcContextClass),
65 NULL, NULL,
66 (GClassInitFunc) sp_arc_context_class_init,
67 NULL, NULL,
68 sizeof(SPArcContext),
69 4,
70 (GInstanceInitFunc) sp_arc_context_init,
71 NULL, /* value_table */
72 };
73 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPArcContext", &info, (GTypeFlags) 0);
74 }
75 return type;
76 }
78 static void sp_arc_context_class_init(SPArcContextClass *klass)
79 {
81 GObjectClass *object_class = (GObjectClass *) klass;
82 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
84 parent_class = (SPEventContextClass*) g_type_class_peek_parent(klass);
86 object_class->dispose = sp_arc_context_dispose;
88 event_context_class->setup = sp_arc_context_setup;
89 event_context_class->root_handler = sp_arc_context_root_handler;
90 event_context_class->item_handler = sp_arc_context_item_handler;
91 }
93 static void sp_arc_context_init(SPArcContext *arc_context)
94 {
95 SPEventContext *event_context = SP_EVENT_CONTEXT(arc_context);
97 event_context->cursor_shape = cursor_ellipse_xpm;
98 event_context->hot_x = 4;
99 event_context->hot_y = 4;
100 event_context->xp = 0;
101 event_context->yp = 0;
102 event_context->tolerance = 0;
103 event_context->within_tolerance = false;
104 event_context->item_to_select = NULL;
106 event_context->shape_repr = NULL;
107 event_context->shape_knot_holder = NULL;
109 arc_context->item = NULL;
111 new (&arc_context->sel_changed_connection) sigc::connection();
112 }
114 static void sp_arc_context_dispose(GObject *object)
115 {
116 SPEventContext *ec = SP_EVENT_CONTEXT(object);
117 SPArcContext *ac = SP_ARC_CONTEXT(object);
119 ec->enableGrDrag(false);
121 ac->sel_changed_connection.disconnect();
122 ac->sel_changed_connection.~connection();
124 if (ec->shape_knot_holder) {
125 delete ec->shape_knot_holder;
126 ec->shape_knot_holder = NULL;
127 }
129 if (ec->shape_repr) { // remove old listener
130 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
131 Inkscape::GC::release(ec->shape_repr);
132 ec->shape_repr = 0;
133 }
135 /* fixme: This is necessary because we do not grab */
136 if (ac->item) {
137 sp_arc_finish(ac);
138 }
140 delete ac->_message_context;
142 G_OBJECT_CLASS(parent_class)->dispose(object);
143 }
145 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
146 NULL, /* child_added */
147 NULL, /* child_removed */
148 ec_shape_event_attr_changed,
149 NULL, /* content_changed */
150 NULL /* order_changed */
151 };
153 /**
154 \brief Callback that processes the "changed" signal on the selection;
155 destroys old and creates new knotholder.
156 */
157 void sp_arc_context_selection_changed(Inkscape::Selection * selection, gpointer data)
158 {
159 SPArcContext *ac = SP_ARC_CONTEXT(data);
160 SPEventContext *ec = SP_EVENT_CONTEXT(ac);
162 if (ec->shape_knot_holder) { // desktroy knotholder
163 delete ec->shape_knot_holder;
164 ec->shape_knot_holder = NULL;
165 }
167 if (ec->shape_repr) { // remove old listener
168 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
169 Inkscape::GC::release(ec->shape_repr);
170 ec->shape_repr = 0;
171 }
173 SPItem *item = selection ? selection->singleItem() : NULL;
174 if (item) {
175 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
176 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
177 if (shape_repr) {
178 ec->shape_repr = shape_repr;
179 Inkscape::GC::anchor(shape_repr);
180 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
181 }
182 }
183 }
185 static void sp_arc_context_setup(SPEventContext *ec)
186 {
187 SPArcContext *ac = SP_ARC_CONTEXT(ec);
188 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
190 if (((SPEventContextClass *) parent_class)->setup) {
191 ((SPEventContextClass *) parent_class)->setup(ec);
192 }
194 SPItem *item = selection->singleItem();
196 if (item) {
197 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
198 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
199 if (shape_repr) {
200 ec->shape_repr = shape_repr;
201 Inkscape::GC::anchor(shape_repr);
202 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
203 }
204 }
206 ac->sel_changed_connection.disconnect();
207 ac->sel_changed_connection = selection->connectChanged(
208 sigc::bind(sigc::ptr_fun(&sp_arc_context_selection_changed), (gpointer) ac)
209 );
211 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
212 if (prefs->getBool("/tools/shapes/selcue")) {
213 ec->enableSelectionCue();
214 }
216 if (prefs->getBool("/tools/shapes/gradientdrag")) {
217 ec->enableGrDrag();
218 }
220 ac->_message_context = new Inkscape::MessageContext(ec->desktop->messageStack());
221 }
223 static gint sp_arc_context_item_handler(SPEventContext *event_context, SPItem *item, GdkEvent *event)
224 {
225 SPDesktop *desktop = event_context->desktop;
226 gint ret = FALSE;
228 switch (event->type) {
229 case GDK_BUTTON_PRESS:
230 if (event->button.button == 1 && !event_context->space_panning) {
231 Inkscape::setup_for_drag_start(desktop, event_context, event);
232 ret = TRUE;
233 }
234 break;
235 // motion and release are always on root (why?)
236 default:
237 break;
238 }
240 if (((SPEventContextClass *) parent_class)->item_handler) {
241 ret = ((SPEventContextClass *) parent_class)->item_handler(event_context, item, event);
242 }
244 return ret;
245 }
247 static gint sp_arc_context_root_handler(SPEventContext *event_context, GdkEvent *event)
248 {
249 static bool dragging;
251 SPDesktop *desktop = event_context->desktop;
252 Inkscape::Selection *selection = sp_desktop_selection(desktop);
253 SPArcContext *ac = SP_ARC_CONTEXT(event_context);
254 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
256 event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
258 gint ret = FALSE;
260 switch (event->type) {
261 case GDK_BUTTON_PRESS:
262 if (event->button.button == 1 && !event_context->space_panning) {
264 dragging = true;
265 ac->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
267 /* Snap center */
268 SnapManager &m = desktop->namedview->snap_manager;
269 m.setup(desktop);
270 Geom::Point pt2g = to_2geom(ac->center);
271 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g);
272 ac->center = from_2geom(pt2g);
274 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
275 GDK_KEY_PRESS_MASK | GDK_BUTTON_RELEASE_MASK |
276 GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_PRESS_MASK,
277 NULL, event->button.time);
278 ret = TRUE;
279 }
280 break;
281 case GDK_MOTION_NOTIFY:
282 if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
284 if ( event_context->within_tolerance
285 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
286 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
287 break; // do not drag if we're within tolerance from origin
288 }
289 // Once the user has moved farther than tolerance from the original location
290 // (indicating they intend to draw, not click), then always process the
291 // motion notify coordinates as given (no snapping back to origin)
292 event_context->within_tolerance = false;
294 Geom::Point const motion_w(event->motion.x, event->motion.y);
295 Geom::Point motion_dt(desktop->w2d(motion_w));
297 sp_arc_drag(ac, motion_dt, event->motion.state);
299 gobble_motion_events(GDK_BUTTON1_MASK);
301 ret = TRUE;
302 }
303 break;
304 case GDK_BUTTON_RELEASE:
305 event_context->xp = event_context->yp = 0;
306 if (event->button.button == 1 && !event_context->space_panning) {
307 dragging = false;
308 if (!event_context->within_tolerance) {
309 // we've been dragging, finish the arc
310 sp_arc_finish(ac);
311 } else if (event_context->item_to_select) {
312 // no dragging, select clicked item if any
313 if (event->button.state & GDK_SHIFT_MASK) {
314 selection->toggle(event_context->item_to_select);
315 } else {
316 selection->set(event_context->item_to_select);
317 }
318 } else {
319 // click in an empty space
320 selection->clear();
321 }
322 event_context->xp = 0;
323 event_context->yp = 0;
324 event_context->item_to_select = NULL;
325 ret = TRUE;
326 }
327 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
328 break;
329 case GDK_KEY_PRESS:
330 switch (get_group0_keyval (&event->key)) {
331 case GDK_Alt_L:
332 case GDK_Alt_R:
333 case GDK_Control_L:
334 case GDK_Control_R:
335 case GDK_Shift_L:
336 case GDK_Shift_R:
337 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
338 case GDK_Meta_R:
339 if (!dragging) {
340 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
341 _("<b>Ctrl</b>: make circle or integer-ratio ellipse, snap arc/segment angle"),
342 _("<b>Shift</b>: draw around the starting point"),
343 NULL);
344 }
345 break;
346 case GDK_Up:
347 case GDK_Down:
348 case GDK_KP_Up:
349 case GDK_KP_Down:
350 // prevent the zoom field from activation
351 if (!MOD__CTRL_ONLY)
352 ret = TRUE;
353 break;
354 case GDK_x:
355 case GDK_X:
356 if (MOD__ALT_ONLY) {
357 desktop->setToolboxFocusTo ("altx-arc");
358 ret = TRUE;
359 }
360 break;
361 case GDK_Escape:
362 sp_desktop_selection(desktop)->clear();
363 //TODO: make dragging escapable by Esc
364 break;
366 case GDK_space:
367 if (dragging) {
368 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
369 event->button.time);
370 dragging = false;
371 if (!event_context->within_tolerance) {
372 // we've been dragging, finish the rect
373 sp_arc_finish(ac);
374 }
375 // do not return true, so that space would work switching to selector
376 }
377 break;
379 default:
380 break;
381 }
382 break;
383 case GDK_KEY_RELEASE:
384 switch (event->key.keyval) {
385 case GDK_Alt_L:
386 case GDK_Alt_R:
387 case GDK_Control_L:
388 case GDK_Control_R:
389 case GDK_Shift_L:
390 case GDK_Shift_R:
391 case GDK_Meta_L: // Meta is when you press Shift+Alt
392 case GDK_Meta_R:
393 event_context->defaultMessageContext()->clear();
394 break;
395 default:
396 break;
397 }
398 break;
399 default:
400 break;
401 }
403 if (!ret) {
404 if (((SPEventContextClass *) parent_class)->root_handler) {
405 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
406 }
407 }
409 return ret;
410 }
412 static void sp_arc_drag(SPArcContext *ac, Geom::Point pt, guint state)
413 {
414 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
416 if (!ac->item) {
418 if (Inkscape::have_viable_layer(desktop, ac->_message_context) == false) {
419 return;
420 }
422 /* Create object */
423 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(desktop->doc());
424 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
425 repr->setAttribute("sodipodi:type", "arc");
427 /* Set style */
428 sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/arc", false);
430 ac->item = SP_ITEM(desktop->currentLayer()->appendChildRepr(repr));
431 Inkscape::GC::release(repr);
432 ac->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
433 ac->item->updateRepr();
435 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
436 }
438 bool ctrl_save = false;
439 if ((state & GDK_MOD1_MASK) && (state & GDK_CONTROL_MASK) && !(state & GDK_SHIFT_MASK)) {
440 // if Alt is pressed without Shift in addition to Control, temporarily drop the CONTROL mask
441 // so that the ellipse is not constrained to integer ratios
442 ctrl_save = true;
443 state = state ^ GDK_CONTROL_MASK;
444 }
445 Geom::Rect r = Inkscape::snap_rectangular_box(desktop, ac->item, pt, ac->center, state);
446 if (ctrl_save) {
447 state = state ^ GDK_CONTROL_MASK;
448 }
450 Geom::Point dir = r.dimensions() / 2;
451 if (state & GDK_MOD1_MASK) {
452 /* With Alt let the ellipse pass through the mouse pointer */
453 Geom::Point c = r.midpoint();
454 if (!ctrl_save) {
455 if (fabs(dir[Geom::X]) > 1E-6 && fabs(dir[Geom::Y]) > 1E-6) {
456 Geom::Matrix const i2d (sp_item_i2d_affine (ac->item));
457 Geom::Point new_dir = pt * i2d - c;
458 new_dir[Geom::X] *= dir[Geom::Y] / dir[Geom::X];
459 double lambda = new_dir.length() / dir[Geom::Y];
460 r = Geom::Rect (c - lambda*dir, c + lambda*dir);
461 }
462 } else {
463 /* with Alt+Ctrl (without Shift) we generate a perfect circle
464 with diameter click point <--> mouse pointer */
465 double l = dir.length();
466 Geom::Point d (l, l);
467 r = Geom::Rect (c - d, c + d);
468 }
469 }
471 sp_arc_position_set(SP_ARC(ac->item),
472 r.midpoint()[Geom::X], r.midpoint()[Geom::Y],
473 r.dimensions()[Geom::X] / 2, r.dimensions()[Geom::Y] / 2);
475 double rdimx = r.dimensions()[Geom::X];
476 double rdimy = r.dimensions()[Geom::Y];
477 GString *xs = SP_PX_TO_METRIC_STRING(rdimx, desktop->namedview->getDefaultMetric());
478 GString *ys = SP_PX_TO_METRIC_STRING(rdimy, desktop->namedview->getDefaultMetric());
479 if (state & GDK_CONTROL_MASK) {
480 int ratio_x, ratio_y;
481 if (fabs (rdimx) > fabs (rdimy)) {
482 ratio_x = (int) rint (rdimx / rdimy);
483 ratio_y = 1;
484 } else {
485 ratio_x = 1;
486 ratio_y = (int) rint (rdimy / rdimx);
487 }
488 ac->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Ellipse</b>: %s × %s (constrained to ratio %d:%d); with <b>Shift</b> to draw around the starting point"), xs->str, ys->str, ratio_x, ratio_y);
489 } else {
490 ac->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE, _("<b>Ellipse</b>: %s × %s; with <b>Ctrl</b> to make square or integer-ratio ellipse; with <b>Shift</b> to draw around the starting point"), xs->str, ys->str);
491 }
492 g_string_free(xs, FALSE);
493 g_string_free(ys, FALSE);
494 }
496 static void sp_arc_finish(SPArcContext *ac)
497 {
498 ac->_message_context->clear();
500 if (ac->item != NULL) {
501 SPDesktop *desktop = SP_EVENT_CONTEXT(ac)->desktop;
503 SP_OBJECT(ac->item)->updateRepr();
505 sp_canvas_end_forced_full_redraws(desktop->canvas);
507 sp_desktop_selection(desktop)->set(ac->item);
508 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_ARC,
509 _("Create ellipse"));
511 ac->item = NULL;
512 }
513 }
516 /*
517 Local Variables:
518 mode:c++
519 c-file-style:"stroustrup"
520 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
521 indent-tabs-mode:nil
522 fill-column:99
523 End:
524 */
525 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :