1 #define __SP_SPIRAL_CONTEXT_C__
3 /*
4 * Spiral drawing context
5 *
6 * Authors:
7 * Mitsuru Oka
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 * bulia byak <buliabyak@users.sf.net>
10 *
11 * Copyright (C) 1999-2001 Lauris Kaplinski
12 * Copyright (C) 2001-2002 Mitsuru Oka
13 *
14 * Released under GNU GPL
15 */
17 #include "config.h"
19 #include <gdk/gdkkeysyms.h>
20 #include <cstring>
21 #include <string>
23 #include "macros.h"
24 #include "display/sp-canvas.h"
25 #include "sp-spiral.h"
26 #include "document.h"
27 #include "sp-namedview.h"
28 #include "selection.h"
29 #include "desktop-handles.h"
30 #include "snap.h"
31 #include "desktop.h"
32 #include "desktop-style.h"
33 #include "message-context.h"
34 #include "pixmaps/cursor-spiral.xpm"
35 #include "spiral-context.h"
36 #include "sp-metrics.h"
37 #include <glibmm/i18n.h>
38 #include "object-edit.h"
39 #include "xml/repr.h"
40 #include "xml/node-event-vector.h"
41 #include "preferences.h"
42 #include "context-fns.h"
43 #include "shape-editor.h"
45 static void sp_spiral_context_class_init(SPSpiralContextClass * klass);
46 static void sp_spiral_context_init(SPSpiralContext *spiral_context);
47 static void sp_spiral_context_dispose(GObject *object);
48 static void sp_spiral_context_setup(SPEventContext *ec);
49 static void sp_spiral_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val);
51 static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event);
53 static void sp_spiral_drag(SPSpiralContext *sc, Geom::Point p, guint state);
54 static void sp_spiral_finish(SPSpiralContext *sc);
56 static SPEventContextClass *parent_class;
58 GtkType
59 sp_spiral_context_get_type()
60 {
61 static GType type = 0;
62 if (!type) {
63 GTypeInfo info = {
64 sizeof(SPSpiralContextClass),
65 NULL, NULL,
66 (GClassInitFunc) sp_spiral_context_class_init,
67 NULL, NULL,
68 sizeof(SPSpiralContext),
69 4,
70 (GInstanceInitFunc) sp_spiral_context_init,
71 NULL, /* value_table */
72 };
73 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0);
74 }
75 return type;
76 }
78 static void
79 sp_spiral_context_class_init(SPSpiralContextClass *klass)
80 {
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_spiral_context_dispose;
88 event_context_class->setup = sp_spiral_context_setup;
89 event_context_class->set = sp_spiral_context_set;
90 event_context_class->root_handler = sp_spiral_context_root_handler;
91 }
93 static void
94 sp_spiral_context_init(SPSpiralContext *spiral_context)
95 {
96 SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context);
98 event_context->cursor_shape = cursor_spiral_xpm;
99 event_context->hot_x = 4;
100 event_context->hot_y = 4;
101 event_context->xp = 0;
102 event_context->yp = 0;
103 event_context->tolerance = 0;
104 event_context->within_tolerance = false;
105 event_context->item_to_select = NULL;
107 spiral_context->item = NULL;
109 spiral_context->revo = 3.0;
110 spiral_context->exp = 1.0;
111 spiral_context->t0 = 0.0;
113 new (&spiral_context->sel_changed_connection) sigc::connection();
114 }
116 static void
117 sp_spiral_context_dispose(GObject *object)
118 {
119 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object);
120 SPEventContext *ec = SP_EVENT_CONTEXT(object);
122 ec->enableGrDrag(false);
124 sc->sel_changed_connection.disconnect();
125 sc->sel_changed_connection.~connection();
127 delete ec->shape_editor;
128 ec->shape_editor = NULL;
130 /* fixme: This is necessary because we do not grab */
131 if (sc->item) sp_spiral_finish(sc);
133 if (sc->_message_context) {
134 delete sc->_message_context;
135 }
137 G_OBJECT_CLASS(parent_class)->dispose(object);
138 }
140 /**
141 \brief Callback that processes the "changed" signal on the selection;
142 destroys old and creates new knotholder
143 */
144 void
145 sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data)
146 {
147 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data);
148 SPEventContext *ec = SP_EVENT_CONTEXT(sc);
150 ec->shape_editor->unset_item(SH_KNOTHOLDER);
151 SPItem *item = selection->singleItem();
152 ec->shape_editor->set_item(item, SH_KNOTHOLDER);
153 }
155 static void
156 sp_spiral_context_setup(SPEventContext *ec)
157 {
158 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
160 if (((SPEventContextClass *) parent_class)->setup)
161 ((SPEventContextClass *) parent_class)->setup(ec);
163 sp_event_context_read(ec, "expansion");
164 sp_event_context_read(ec, "revolution");
165 sp_event_context_read(ec, "t0");
167 ec->shape_editor = new ShapeEditor(ec->desktop);
169 SPItem *item = sp_desktop_selection(ec->desktop)->singleItem();
170 if (item) {
171 ec->shape_editor->set_item(item, SH_KNOTHOLDER);
172 }
174 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
175 sc->sel_changed_connection.disconnect();
176 sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc));
178 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
179 if (prefs->getBool("/tools/shapes/selcue")) {
180 ec->enableSelectionCue();
181 }
182 if (prefs->getBool("/tools/shapes/gradientdrag")) {
183 ec->enableGrDrag();
184 }
186 sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
187 }
189 static void
190 sp_spiral_context_set(SPEventContext *ec, Inkscape::Preferences::Entry *val)
191 {
192 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
193 Glib::ustring name = val->getEntryName();
195 if (name == "expansion") {
196 sc->exp = CLAMP(val->getDouble(), 0.0, 1000.0);
197 } else if (name == "revolution") {
198 sc->revo = CLAMP(val->getDouble(3.0), 0.05, 40.0);
199 } else if (name == "t0") {
200 sc->t0 = CLAMP(val->getDouble(), 0.0, 0.999);
201 }
202 }
204 static gint
205 sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event)
206 {
207 static gboolean dragging;
209 SPDesktop *desktop = event_context->desktop;
210 Inkscape::Selection *selection = sp_desktop_selection (desktop);
211 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context);
213 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
214 event_context->tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
216 gint ret = FALSE;
218 switch (event->type) {
219 case GDK_BUTTON_PRESS:
220 if (event->button.button == 1 && !event_context->space_panning) {
222 dragging = TRUE;
223 sp_event_context_snap_window_open(event_context);
224 sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
226 SnapManager &m = desktop->namedview->snap_manager;
227 m.setup(desktop);
228 Geom::Point pt2g = to_2geom(sc->center);
229 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE);
230 sc->center = from_2geom(pt2g);
232 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
233 ( GDK_KEY_PRESS_MASK |
234 GDK_BUTTON_RELEASE_MASK |
235 GDK_POINTER_MOTION_MASK |
236 GDK_POINTER_MOTION_HINT_MASK |
237 GDK_BUTTON_PRESS_MASK ),
238 NULL, event->button.time);
239 ret = TRUE;
240 }
241 break;
242 case GDK_MOTION_NOTIFY:
243 if (dragging && (event->motion.state & GDK_BUTTON1_MASK) && !event_context->space_panning) {
245 if ( event_context->within_tolerance
246 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
247 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
248 break; // do not drag if we're within tolerance from origin
249 }
250 // Once the user has moved farther than tolerance from the original location
251 // (indicating they intend to draw, not click), then always process the
252 // motion notify coordinates as given (no snapping back to origin)
253 event_context->within_tolerance = false;
255 Geom::Point const motion_w(event->motion.x, event->motion.y);
256 Geom::Point motion_dt(event_context->desktop->w2d(motion_w));
258 SnapManager &m = desktop->namedview->snap_manager;
259 m.setup(desktop, true, sc->item);
260 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, motion_dt, Inkscape::SNAPSOURCE_HANDLE);
261 sp_spiral_drag(sc, from_2geom(motion_dt), event->motion.state);
263 gobble_motion_events(GDK_BUTTON1_MASK);
265 ret = TRUE;
266 }
267 break;
268 case GDK_BUTTON_RELEASE:
269 event_context->xp = event_context->yp = 0;
270 if (event->button.button == 1 && !event_context->space_panning) {
271 dragging = FALSE;
272 sp_event_context_snap_window_closed(event_context, false); //button release will also occur on a double-click; in that case suppress warnings
273 if (!event_context->within_tolerance) {
274 // we've been dragging, finish the spiral
275 sp_spiral_finish(sc);
276 } else if (event_context->item_to_select) {
277 // no dragging, select clicked item if any
278 if (event->button.state & GDK_SHIFT_MASK) {
279 selection->toggle(event_context->item_to_select);
280 } else {
281 selection->set(event_context->item_to_select);
282 }
283 } else {
284 // click in an empty space
285 selection->clear();
286 }
288 event_context->item_to_select = NULL;
289 ret = TRUE;
290 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
291 }
292 break;
293 case GDK_KEY_PRESS:
294 switch (get_group0_keyval(&event->key)) {
295 case GDK_Alt_R:
296 case GDK_Control_L:
297 case GDK_Control_R:
298 case GDK_Shift_L:
299 case GDK_Shift_R:
300 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
301 case GDK_Meta_R:
302 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
303 _("<b>Ctrl</b>: snap angle"),
304 NULL,
305 _("<b>Alt</b>: lock spiral radius"));
306 break;
307 case GDK_Up:
308 case GDK_Down:
309 case GDK_KP_Up:
310 case GDK_KP_Down:
311 // prevent the zoom field from activation
312 if (!MOD__CTRL_ONLY)
313 ret = TRUE;
314 break;
315 case GDK_x:
316 case GDK_X:
317 if (MOD__ALT_ONLY) {
318 desktop->setToolboxFocusTo ("altx-spiral");
319 ret = TRUE;
320 }
321 break;
322 case GDK_Escape:
323 sp_desktop_selection(desktop)->clear();
324 //TODO: make dragging escapable by Esc
325 break;
327 case GDK_space:
328 if (dragging) {
329 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate),
330 event->button.time);
331 dragging = false;
332 sp_event_context_snap_window_closed(event_context);
333 if (!event_context->within_tolerance) {
334 // we've been dragging, finish the rect
335 sp_spiral_finish(sc);
336 }
337 // do not return true, so that space would work switching to selector
338 }
339 break;
341 default:
342 break;
343 }
344 break;
345 case GDK_KEY_RELEASE:
346 switch (get_group0_keyval(&event->key)) {
347 case GDK_Alt_L:
348 case GDK_Alt_R:
349 case GDK_Control_L:
350 case GDK_Control_R:
351 case GDK_Shift_L:
352 case GDK_Shift_R:
353 case GDK_Meta_L: // Meta is when you press Shift+Alt
354 case GDK_Meta_R:
355 event_context->defaultMessageContext()->clear();
356 break;
357 default:
358 break;
359 }
360 break;
361 default:
362 break;
363 }
365 if (!ret) {
366 if (((SPEventContextClass *) parent_class)->root_handler)
367 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
368 }
370 return ret;
371 }
373 static void
374 sp_spiral_drag(SPSpiralContext *sc, Geom::Point p, guint state)
375 {
376 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
378 Inkscape::Preferences *prefs = Inkscape::Preferences::get();
379 int const snaps = prefs->getInt("/options/rotationsnapsperpi/value", 12);
381 if (!sc->item) {
383 if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
384 return;
385 }
387 /* Create object */
388 Inkscape::XML::Document *xml_doc = sp_document_repr_doc(SP_EVENT_CONTEXT_DOCUMENT(sc));
389 Inkscape::XML::Node *repr = xml_doc->createElement("svg:path");
390 repr->setAttribute("sodipodi:type", "spiral");
392 /* Set style */
393 sp_desktop_apply_style_tool(desktop, repr, "/tools/shapes/spiral", false);
395 sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
396 Inkscape::GC::release(repr);
397 sc->item->transform = sp_item_i2doc_affine(SP_ITEM(desktop->currentLayer())).inverse();
398 sc->item->updateRepr();
400 sp_canvas_force_full_redraw_after_interruptions(desktop->canvas, 5);
401 }
403 SnapManager &m = desktop->namedview->snap_manager;
404 m.setup(desktop, true, sc->item);
405 Geom::Point pt2g = to_2geom(p);
406 m.freeSnapReturnByRef(Inkscape::SnapPreferences::SNAPPOINT_NODE, pt2g, Inkscape::SNAPSOURCE_HANDLE);
408 Geom::Point const p0 = desktop->dt2doc(sc->center);
409 Geom::Point const p1 = desktop->dt2doc(pt2g);
411 SPSpiral *spiral = SP_SPIRAL(sc->item);
413 Geom::Point const delta = p1 - p0;
414 gdouble const rad = Geom::L2(delta);
416 gdouble arg = Geom::atan2(delta) - 2.0*M_PI*spiral->revo;
418 if (state & GDK_CONTROL_MASK) {
419 arg = sp_round(arg, M_PI/snaps);
420 }
422 /* Fixme: these parameters should be got from dialog box */
423 sp_spiral_position_set(spiral, p0[Geom::X], p0[Geom::Y],
424 /*expansion*/ sc->exp,
425 /*revolution*/ sc->revo,
426 rad, arg,
427 /*t0*/ sc->t0);
429 /* status text */
430 GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
431 sc->_message_context->setF(Inkscape::IMMEDIATE_MESSAGE,
432 _("<b>Spiral</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle"),
433 rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
434 g_string_free(rads, FALSE);
435 }
437 static void
438 sp_spiral_finish(SPSpiralContext *sc)
439 {
440 sc->_message_context->clear();
442 if (sc->item != NULL) {
443 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
444 SPSpiral *spiral = SP_SPIRAL(sc->item);
446 sp_shape_set_shape(SP_SHAPE(spiral));
447 SP_OBJECT(spiral)->updateRepr(SP_OBJECT_WRITE_EXT);
449 sp_canvas_end_forced_full_redraws(desktop->canvas);
451 sp_desktop_selection(desktop)->set(sc->item);
452 sp_document_done(sp_desktop_document(desktop), SP_VERB_CONTEXT_SPIRAL,
453 _("Create spiral"));
455 sc->item = NULL;
456 }
457 }
460 /*
461 Local Variables:
462 mode:c++
463 c-file-style:"stroustrup"
464 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
465 indent-tabs-mode:nil
466 fill-column:99
467 End:
468 */
469 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :