92c338d846db8cfdeb3f979463a6ad7bc2a5e4b4
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>
21 #include "macros.h"
22 #include "display/sp-canvas.h"
23 #include "sp-spiral.h"
24 #include "document.h"
25 #include "sp-namedview.h"
26 #include "selection.h"
27 #include "desktop-handles.h"
28 #include "desktop-affine.h"
29 #include "snap.h"
30 #include "desktop.h"
31 #include "desktop-style.h"
32 #include "message-context.h"
33 #include "pixmaps/cursor-spiral.xpm"
34 #include "pixmaps/cursor-spiral.pixbuf"
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 "prefs-utils.h"
42 #include "context-fns.h"
44 static void sp_spiral_context_class_init(SPSpiralContextClass * klass);
45 static void sp_spiral_context_init(SPSpiralContext *spiral_context);
46 static void sp_spiral_context_dispose(GObject *object);
47 static void sp_spiral_context_setup(SPEventContext *ec);
48 static void sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val);
50 static gint sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event);
52 static void sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state);
53 static void sp_spiral_finish(SPSpiralContext *sc);
55 static SPEventContextClass *parent_class;
57 GtkType
58 sp_spiral_context_get_type()
59 {
60 static GType type = 0;
61 if (!type) {
62 GTypeInfo info = {
63 sizeof(SPSpiralContextClass),
64 NULL, NULL,
65 (GClassInitFunc) sp_spiral_context_class_init,
66 NULL, NULL,
67 sizeof(SPSpiralContext),
68 4,
69 (GInstanceInitFunc) sp_spiral_context_init,
70 NULL, /* value_table */
71 };
72 type = g_type_register_static(SP_TYPE_EVENT_CONTEXT, "SPSpiralContext", &info, (GTypeFlags)0);
73 }
74 return type;
75 }
77 static void
78 sp_spiral_context_class_init(SPSpiralContextClass *klass)
79 {
80 GObjectClass *object_class = (GObjectClass *) klass;
81 SPEventContextClass *event_context_class = (SPEventContextClass *) klass;
83 parent_class = (SPEventContextClass*)g_type_class_peek_parent(klass);
85 object_class->dispose = sp_spiral_context_dispose;
87 event_context_class->setup = sp_spiral_context_setup;
88 event_context_class->set = sp_spiral_context_set;
89 event_context_class->root_handler = sp_spiral_context_root_handler;
90 }
92 static void
93 sp_spiral_context_init(SPSpiralContext *spiral_context)
94 {
95 SPEventContext *event_context = SP_EVENT_CONTEXT(spiral_context);
97 event_context->cursor_shape = cursor_spiral_xpm;
98 event_context->cursor_pixbuf = gdk_pixbuf_new_from_inline(
99 -1,
100 cursor_spiral_pixbuf,
101 FALSE,
102 NULL);
103 event_context->hot_x = 4;
104 event_context->hot_y = 4;
105 event_context->xp = 0;
106 event_context->yp = 0;
107 event_context->tolerance = 0;
108 event_context->within_tolerance = false;
109 event_context->item_to_select = NULL;
111 event_context->shape_repr = NULL;
112 event_context->shape_knot_holder = NULL;
114 spiral_context->item = NULL;
116 spiral_context->revo = 3.0;
117 spiral_context->exp = 1.0;
118 spiral_context->t0 = 0.0;
120 new (&spiral_context->sel_changed_connection) sigc::connection();
121 }
123 static void
124 sp_spiral_context_dispose(GObject *object)
125 {
126 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(object);
127 SPEventContext *ec = SP_EVENT_CONTEXT(object);
129 ec->enableGrDrag(false);
131 sc->sel_changed_connection.disconnect();
132 sc->sel_changed_connection.~connection();
134 /* fixme: This is necessary because we do not grab */
135 if (sc->item) sp_spiral_finish(sc);
137 if (ec->shape_knot_holder) {
138 sp_knot_holder_destroy(ec->shape_knot_holder);
139 ec->shape_knot_holder = NULL;
140 }
142 if (ec->shape_repr) { // remove old listener
143 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
144 Inkscape::GC::release(ec->shape_repr);
145 ec->shape_repr = 0;
146 }
148 if (sc->_message_context) {
149 delete sc->_message_context;
150 }
152 G_OBJECT_CLASS(parent_class)->dispose(object);
153 }
155 static Inkscape::XML::NodeEventVector ec_shape_repr_events = {
156 NULL, /* child_added */
157 NULL, /* child_removed */
158 ec_shape_event_attr_changed,
159 NULL, /* content_changed */
160 NULL /* order_changed */
161 };
163 /**
164 \brief Callback that processes the "changed" signal on the selection;
165 destroys old and creates new knotholder
166 */
167 void
168 sp_spiral_context_selection_changed(Inkscape::Selection *selection, gpointer data)
169 {
170 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(data);
171 SPEventContext *ec = SP_EVENT_CONTEXT(sc);
173 if (ec->shape_knot_holder) { // desktroy knotholder
174 sp_knot_holder_destroy(ec->shape_knot_holder);
175 ec->shape_knot_holder = NULL;
176 }
178 if (ec->shape_repr) { // remove old listener
179 sp_repr_remove_listener_by_data(ec->shape_repr, ec);
180 Inkscape::GC::release(ec->shape_repr);
181 ec->shape_repr = 0;
182 }
184 SPItem *item = selection->singleItem();
185 if (item) {
186 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
187 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
188 if (shape_repr) {
189 ec->shape_repr = shape_repr;
190 Inkscape::GC::anchor(shape_repr);
191 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
192 }
193 }
194 }
196 static void
197 sp_spiral_context_setup(SPEventContext *ec)
198 {
199 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
201 if (((SPEventContextClass *) parent_class)->setup)
202 ((SPEventContextClass *) parent_class)->setup(ec);
204 sp_event_context_read(ec, "expansion");
205 sp_event_context_read(ec, "revolution");
206 sp_event_context_read(ec, "t0");
208 Inkscape::Selection *selection = sp_desktop_selection(ec->desktop);
210 SPItem *item = selection->singleItem();
211 if (item) {
212 ec->shape_knot_holder = sp_item_knot_holder(item, ec->desktop);
213 Inkscape::XML::Node *shape_repr = SP_OBJECT_REPR(item);
214 if (shape_repr) {
215 ec->shape_repr = shape_repr;
216 Inkscape::GC::anchor(shape_repr);
217 sp_repr_add_listener(shape_repr, &ec_shape_repr_events, ec);
218 }
219 }
221 sc->sel_changed_connection.disconnect();
222 sc->sel_changed_connection = selection->connectChanged(sigc::bind(sigc::ptr_fun(&sp_spiral_context_selection_changed), (gpointer)sc));
224 if (prefs_get_int_attribute("tools.shapes", "selcue", 0) != 0) {
225 ec->enableSelectionCue();
226 }
228 if (prefs_get_int_attribute("tools.shapes", "gradientdrag", 0) != 0) {
229 ec->enableGrDrag();
230 }
232 sc->_message_context = new Inkscape::MessageContext((ec->desktop)->messageStack());
233 }
235 static void
236 sp_spiral_context_set(SPEventContext *ec, gchar const *key, gchar const *val)
237 {
238 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(ec);
240 if (!strcmp(key, "expansion")) {
241 sc->exp = (val) ? g_ascii_strtod(val, NULL) : 1.0;
242 sc->exp = CLAMP(sc->exp, 0.0, 1000.0);
243 } else if (!strcmp(key, "revolution")) {
244 sc->revo = (val) ? g_ascii_strtod(val, NULL) : 3.0;
245 sc->revo = CLAMP(sc->revo, 0.05, 40.0);
246 } else if (!strcmp(key, "t0")) {
247 sc->t0 = (val) ? g_ascii_strtod(val, NULL) : 0.0;
248 sc->t0 = CLAMP(sc->t0, 0.0, 0.999);
249 }
250 }
252 static gint
253 sp_spiral_context_root_handler(SPEventContext *event_context, GdkEvent *event)
254 {
255 static gboolean dragging;
257 SPDesktop *desktop = event_context->desktop;
258 Inkscape::Selection *selection = sp_desktop_selection (desktop);
259 SPSpiralContext *sc = SP_SPIRAL_CONTEXT(event_context);
261 event_context->tolerance = prefs_get_int_attribute_limited("options.dragtolerance", "value", 0, 0, 100);
263 gint ret = FALSE;
265 switch (event->type) {
266 case GDK_BUTTON_PRESS:
267 if (event->button.button == 1) {
269 dragging = TRUE;
270 sc->center = Inkscape::setup_for_drag_start(desktop, event_context, event);
272 SnapManager const &m = desktop->namedview->snap_manager;
273 sc->center = m.freeSnap(Inkscape::Snapper::SNAP_POINT, sc->center, sc->item).getPoint();
275 sp_canvas_item_grab(SP_CANVAS_ITEM(desktop->acetate),
276 ( GDK_KEY_PRESS_MASK |
277 GDK_BUTTON_RELEASE_MASK |
278 GDK_POINTER_MOTION_MASK |
279 GDK_BUTTON_PRESS_MASK ),
280 NULL, event->button.time);
281 ret = TRUE;
282 }
283 break;
284 case GDK_MOTION_NOTIFY:
285 if (dragging && event->motion.state && GDK_BUTTON1_MASK) {
287 if ( event_context->within_tolerance
288 && ( abs( (gint) event->motion.x - event_context->xp ) < event_context->tolerance )
289 && ( abs( (gint) event->motion.y - event_context->yp ) < event_context->tolerance ) ) {
290 break; // do not drag if we're within tolerance from origin
291 }
292 // Once the user has moved farther than tolerance from the original location
293 // (indicating they intend to draw, not click), then always process the
294 // motion notify coordinates as given (no snapping back to origin)
295 event_context->within_tolerance = false;
297 NR::Point const motion_w(event->motion.x, event->motion.y);
298 NR::Point const motion_dt(event_context->desktop->w2d(motion_w));
299 sp_spiral_drag(sc, motion_dt, event->motion.state);
300 ret = TRUE;
301 }
302 break;
303 case GDK_BUTTON_RELEASE:
304 event_context->xp = event_context->yp = 0;
305 if (event->button.button == 1) {
306 dragging = FALSE;
307 if (!event_context->within_tolerance) {
308 // we've been dragging, finish the spiral
309 sp_spiral_finish(sc);
310 } else if (event_context->item_to_select) {
311 // no dragging, select clicked item if any
312 if (event->button.state & GDK_SHIFT_MASK) {
313 selection->toggle(event_context->item_to_select);
314 } else {
315 selection->set(event_context->item_to_select);
316 }
317 } else {
318 // click in an empty space
319 selection->clear();
320 }
322 event_context->item_to_select = NULL;
323 ret = TRUE;
324 sp_canvas_item_ungrab(SP_CANVAS_ITEM(desktop->acetate), event->button.time);
325 }
326 break;
327 case GDK_KEY_PRESS:
328 switch (get_group0_keyval(&event->key)) {
329 case GDK_Alt_R:
330 case GDK_Control_L:
331 case GDK_Control_R:
332 case GDK_Shift_L:
333 case GDK_Shift_R:
334 case GDK_Meta_L: // Meta is when you press Shift+Alt (at least on my machine)
335 case GDK_Meta_R:
336 sp_event_show_modifier_tip(event_context->defaultMessageContext(), event,
337 _("<b>Ctrl</b>: snap angle"),
338 NULL,
339 _("<b>Alt</b>: lock spiral radius"));
340 break;
341 case GDK_Up:
342 case GDK_Down:
343 case GDK_KP_Up:
344 case GDK_KP_Down:
345 // prevent the zoom field from activation
346 if (!MOD__CTRL_ONLY)
347 ret = TRUE;
348 break;
349 case GDK_x:
350 case GDK_X:
351 if (MOD__ALT_ONLY) {
352 desktop->setToolboxFocusTo ("altx-spiral");
353 ret = TRUE;
354 }
355 break;
356 case GDK_Escape:
357 sp_desktop_selection(desktop)->clear();
358 //TODO: make dragging escapable by Esc
359 default:
360 break;
361 }
362 break;
363 case GDK_KEY_RELEASE:
364 switch (get_group0_keyval(&event->key)) {
365 case GDK_Alt_L:
366 case GDK_Alt_R:
367 case GDK_Control_L:
368 case GDK_Control_R:
369 case GDK_Shift_L:
370 case GDK_Shift_R:
371 case GDK_Meta_L: // Meta is when you press Shift+Alt
372 case GDK_Meta_R:
373 event_context->defaultMessageContext()->clear();
374 break;
375 default:
376 break;
377 }
378 break;
379 default:
380 break;
381 }
383 if (!ret) {
384 if (((SPEventContextClass *) parent_class)->root_handler)
385 ret = ((SPEventContextClass *) parent_class)->root_handler(event_context, event);
386 }
388 return ret;
389 }
391 static void
392 sp_spiral_drag(SPSpiralContext *sc, NR::Point p, guint state)
393 {
394 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
396 int const snaps = prefs_get_int_attribute("options.rotationsnapsperpi", "value", 12);
398 if (!sc->item) {
400 if (Inkscape::have_viable_layer(desktop, sc->_message_context) == false) {
401 return;
402 }
404 /* Create object */
405 Inkscape::XML::Node *repr = sp_repr_new("svg:path");
406 repr->setAttribute("sodipodi:type", "spiral");
408 /* Set style */
409 sp_desktop_apply_style_tool(desktop, repr, "tools.shapes.spiral", false);
411 sc->item = (SPItem *) desktop->currentLayer()->appendChildRepr(repr);
412 Inkscape::GC::release(repr);
413 sc->item->transform = SP_ITEM(desktop->currentRoot())->getRelativeTransform(desktop->currentLayer());
414 sc->item->updateRepr();
415 }
417 NR::Point const p0 = sp_desktop_dt2root_xy_point(desktop, sc->center);
418 NR::Point p1 = sp_desktop_dt2root_xy_point(desktop, p);
419 SnapManager const &m = desktop->namedview->snap_manager;
420 p1 = m.freeSnap(Inkscape::Snapper::SNAP_POINT, p1, sc->item).getPoint();
422 SPSpiral *spiral = SP_SPIRAL(sc->item);
424 NR::Point const delta = p1 - p0;
425 gdouble const rad = NR::L2(delta);
427 gdouble arg = NR::atan2(delta) - 2.0*M_PI*spiral->revo;
429 if (state & GDK_CONTROL_MASK) {
430 arg = sp_round(arg, M_PI/snaps);
431 }
433 /* Fixme: these parameters should be got from dialog box */
434 sp_spiral_position_set(spiral, p0[NR::X], p0[NR::Y],
435 /*expansion*/ sc->exp,
436 /*revolution*/ sc->revo,
437 rad, arg,
438 /*t0*/ sc->t0);
440 /* status text */
441 GString *rads = SP_PX_TO_METRIC_STRING(rad, desktop->namedview->getDefaultMetric());
442 sc->_message_context->setF(Inkscape::NORMAL_MESSAGE,
443 _("<b>Spiral</b>: radius %s, angle %5g°; with <b>Ctrl</b> to snap angle"),
444 rads->str, sp_round((arg + 2.0*M_PI*spiral->revo)*180/M_PI, 0.0001));
445 g_string_free(rads, FALSE);
446 }
448 static void
449 sp_spiral_finish(SPSpiralContext *sc)
450 {
451 sc->_message_context->clear();
453 if (sc->item != NULL) {
454 SPDesktop *desktop = SP_EVENT_CONTEXT(sc)->desktop;
455 SPSpiral *spiral = SP_SPIRAL(sc->item);
457 sp_shape_set_shape(SP_SHAPE(spiral));
458 SP_OBJECT(spiral)->updateRepr(NULL, SP_OBJECT_WRITE_EXT);
460 sp_desktop_selection(desktop)->set(sc->item);
461 sp_document_done(sp_desktop_document(desktop));
463 sc->item = NULL;
464 }
465 }
468 /*
469 Local Variables:
470 mode:c++
471 c-file-style:"stroustrup"
472 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
473 indent-tabs-mode:nil
474 fill-column:99
475 End:
476 */
477 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :