void SnapManager::guideConstrainedSnap(Geom::Point &p, SPGuide const &guideline) const
{
if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() || !snapprefs.isTargetSnappable(Inkscape::SNAPTARGET_GUIDE)) {
return;
}
Inkscape::SnapCandidatePoint candidate(p, Inkscape::SNAPSOURCE_GUIDE_ORIGIN, Inkscape::SNAPTARGET_UNDEFINED);
IntermSnapResults isr;
Inkscape::Snapper::SnapConstraint cl(guideline.getPoint(), Geom::rot90(guideline.getNormal()));
SnapperList snappers = getSnappers();
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); ++i) {
(*i)->constrainedSnap(isr, candidate, Geom::OptRect(), cl, NULL, NULL);
}
Inkscape::SnappedPoint const s = findBestSnap(candidate, isr, false);
s.getPointIfSnapped(p);
}
gint sp_dt_guide_event(SPCanvasItem *item, GdkEvent *event, gpointer data)
{
static bool moved = false;
gint ret = FALSE;
SPGuide *guide = SP_GUIDE(data);
SPDesktop *desktop = static_cast<SPDesktop*>(g_object_get_data(G_OBJECT(item->canvas), "SPDesktop"));
switch (event->type) {
case GDK_2BUTTON_PRESS:
if (event->button.button == 1) {
drag_type = SP_DRAG_NONE;
sp_event_context_discard_delayed_snap_event(desktop->event_context);
sp_canvas_item_ungrab(item, event->button.time);
Inkscape::UI::Dialogs::GuidelinePropertiesDialog::showDialog(guide, desktop);
ret = TRUE;
}
break;
case GDK_BUTTON_PRESS:
if (event->button.button == 1) {
Geom::Point const event_w(event->button.x, event->button.y);
Geom::Point const event_dt(desktop->w2d(event_w));
// Due to the tolerance allowed when grabbing a guide, event_dt will generally
// be close to the guide but not just exactly on it. The drag origin calculated
// here must be exactly on the guide line though, otherwise
// small errors will occur once we snap, see
// https://bugs.launchpad.net/inkscape/+bug/333762
drag_origin = Geom::projection(event_dt, Geom::Line(guide->getPoint(), guide->angle()));
if (event->button.state & GDK_SHIFT_MASK) {
// with shift we rotate the guide
drag_type = SP_DRAG_ROTATE;
} else {
if (event->button.state & GDK_CONTROL_MASK) {
drag_type = SP_DRAG_MOVE_ORIGIN;
} else {
drag_type = SP_DRAG_TRANSLATE;
}
}
if (drag_type == SP_DRAG_ROTATE || drag_type == SP_DRAG_TRANSLATE) {
sp_canvas_item_grab(item,
( GDK_BUTTON_RELEASE_MASK |
GDK_BUTTON_PRESS_MASK |
GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK ),
NULL,
event->button.time);
}
ret = TRUE;
}
break;
case GDK_MOTION_NOTIFY:
if (drag_type != SP_DRAG_NONE) {
Geom::Point const motion_w(event->motion.x,
event->motion.y);
Geom::Point motion_dt(desktop->w2d(motion_w));
sp_event_context_snap_delay_handler(desktop->event_context, (gpointer) item, data, (GdkEventMotion *)event, Inkscape::UI::Tools::DelayedSnapEvent::GUIDE_HANDLER);
// This is for snapping while dragging existing guidelines. New guidelines,
// which are dragged off the ruler, are being snapped in sp_dt_ruler_event
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, true, NULL, NULL, guide);
if (drag_type == SP_DRAG_MOVE_ORIGIN) {
// If we snap in guideConstrainedSnap() below, then motion_dt will
// be forced to be on the guide. If we don't snap however, then
// the origin should still be constrained to the guide. So let's do
// that explicitly first:
Geom::Line line(guide->getPoint(), guide->angle());
Geom::Coord t = line.nearestTime(motion_dt);
motion_dt = line.pointAt(t);
if (!(event->motion.state & GDK_SHIFT_MASK)) {
m.guideConstrainedSnap(motion_dt, *guide);
}
} else if (!((drag_type == SP_DRAG_ROTATE) && (event->motion.state & GDK_CONTROL_MASK))) {
// cannot use shift here to disable snapping, because we already use it for rotating the guide
Geom::Point temp;
if (drag_type == SP_DRAG_ROTATE) {
temp = guide->getPoint();
m.guideFreeSnap(motion_dt, temp, true, false);
guide->moveto(temp, false);
} else {
temp = guide->getNormal();
m.guideFreeSnap(motion_dt, temp, false, true);
guide->set_normal(temp, false);
}
}
m.unSetup();
switch (drag_type) {
case SP_DRAG_TRANSLATE:
{
guide->moveto(motion_dt, false);
break;
}
case SP_DRAG_ROTATE:
{
Geom::Point pt = motion_dt - guide->getPoint();
Geom::Angle angle(pt);
if (event->motion.state & GDK_CONTROL_MASK) {
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
unsigned const snaps = abs(prefs->getInt("/options/rotationsnapsperpi/value", 12));
bool const relative_snaps = prefs->getBool("/options/relativeguiderotationsnap/value", false);
if (snaps) {
if (relative_snaps) {
Geom::Angle orig_angle(guide->getNormal());
Geom::Angle snap_angle = angle - orig_angle;
double sections = floor(snap_angle.radians0() * snaps / M_PI + .5);
angle = (M_PI / snaps) * sections + orig_angle.radians0();
} else {
double sections = floor(angle.radians0() * snaps / M_PI + .5);
angle = (M_PI / snaps) * sections;
}
}
}
guide->set_normal(Geom::Point::polar(angle).cw(), false);
break;
}
case SP_DRAG_MOVE_ORIGIN:
{
guide->moveto(motion_dt, false);
break;
}
case SP_DRAG_NONE:
assert(false);
break;
}
moved = true;
desktop->set_coordinate_status(motion_dt);
ret = TRUE;
}
break;
case GDK_BUTTON_RELEASE:
if (drag_type != SP_DRAG_NONE && event->button.button == 1) {
sp_event_context_discard_delayed_snap_event(desktop->event_context);
if (moved) {
Geom::Point const event_w(event->button.x,
event->button.y);
Geom::Point event_dt(desktop->w2d(event_w));
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, true, NULL, NULL, guide);
if (drag_type == SP_DRAG_MOVE_ORIGIN) {
// If we snap in guideConstrainedSnap() below, then motion_dt will
// be forced to be on the guide. If we don't snap however, then
// the origin should still be constrained to the guide. So let's
// do that explicitly first:
Geom::Line line(guide->getPoint(), guide->angle());
Geom::Coord t = line.nearestTime(event_dt);
event_dt = line.pointAt(t);
if (!(event->button.state & GDK_SHIFT_MASK)) {
m.guideConstrainedSnap(event_dt, *guide);
}
} else if (!((drag_type == SP_DRAG_ROTATE) && (event->motion.state & GDK_CONTROL_MASK))) {
// cannot use shift here to disable snapping, because we already use it for rotating the guide
Geom::Point temp;
if (drag_type == SP_DRAG_ROTATE) {
temp = guide->getPoint();
m.guideFreeSnap(event_dt, temp, true, false);
guide->moveto(temp, false);
} else {
temp = guide->getNormal();
m.guideFreeSnap(event_dt, temp, false, true);
guide->set_normal(temp, false);
}
}
m.unSetup();
if (sp_canvas_world_pt_inside_window(item->canvas, event_w)) {
switch (drag_type) {
case SP_DRAG_TRANSLATE:
{
guide->moveto(event_dt, true);
break;
}
case SP_DRAG_ROTATE:
{
Geom::Point pt = event_dt - guide->getPoint();
Geom::Angle angle(pt);
if (event->motion.state & GDK_CONTROL_MASK) {
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
unsigned const snaps = abs(prefs->getInt("/options/rotationsnapsperpi/value", 12));
bool const relative_snaps = prefs->getBool("/options/relativeguiderotationsnap/value", false);
if (snaps) {
if (relative_snaps) {
Geom::Angle orig_angle(guide->getNormal());
Geom::Angle snap_angle = angle - orig_angle;
double sections = floor(snap_angle.radians0() * snaps / M_PI + .5);
angle = (M_PI / snaps) * sections + orig_angle.radians0();
} else {
double sections = floor(angle.radians0() * snaps / M_PI + .5);
angle = (M_PI / snaps) * sections;
}
}
}
guide->set_normal(Geom::Point::polar(angle).cw(), true);
break;
}
case SP_DRAG_MOVE_ORIGIN:
{
guide->moveto(event_dt, true);
break;
}
case SP_DRAG_NONE:
assert(false);
break;
}
DocumentUndo::done(desktop->getDocument(), SP_VERB_NONE,
_("Move guide"));
} else {
/* Undo movement of any attached shapes. */
guide->moveto(guide->getPoint(), false);
guide->set_normal(guide->getNormal(), false);
sp_guide_remove(guide);
DocumentUndo::done(desktop->getDocument(), SP_VERB_NONE,
_("Delete guide"));
}
moved = false;
desktop->set_coordinate_status(event_dt);
}
drag_type = SP_DRAG_NONE;
sp_canvas_item_ungrab(item, event->button.time);
ret=TRUE;
}
break;
case GDK_ENTER_NOTIFY:
{
sp_guideline_set_color(SP_GUIDELINE(item), guide->getHiColor());
// set move or rotate cursor
Geom::Point const event_w(event->crossing.x, event->crossing.y);
if ((event->crossing.state & GDK_SHIFT_MASK) && (drag_type != SP_DRAG_MOVE_ORIGIN)) {
GdkCursor *guide_cursor;
guide_cursor = gdk_cursor_new (GDK_EXCHANGE);
gdk_window_set_cursor(gtk_widget_get_window (GTK_WIDGET(desktop->getCanvas())), guide_cursor);
#if GTK_CHECK_VERSION(3,0,0)
g_object_unref(guide_cursor);
#else
gdk_cursor_unref(guide_cursor);
#endif
} else {
GdkCursor *guide_cursor;
guide_cursor = gdk_cursor_new (GDK_HAND1);
gdk_window_set_cursor(gtk_widget_get_window (GTK_WIDGET(desktop->getCanvas())), guide_cursor);
#if GTK_CHECK_VERSION(3,0,0)
g_object_unref(guide_cursor);
#else
gdk_cursor_unref(guide_cursor);
#endif
}
char *guide_description = guide->description();
desktop->guidesMessageContext()->setF(Inkscape::NORMAL_MESSAGE, _("<b>Guideline</b>: %s"), guide_description);
g_free(guide_description);
break;
}
case GDK_LEAVE_NOTIFY:
sp_guideline_set_color(SP_GUIDELINE(item), guide->getColor());
// restore event context's cursor
gdk_window_set_cursor(gtk_widget_get_window (GTK_WIDGET(desktop->getCanvas())), desktop->event_context->cursor);
desktop->guidesMessageContext()->clear();
break;
case GDK_KEY_PRESS:
switch (Inkscape::UI::Tools::get_group0_keyval (&event->key)) {
case GDK_KEY_Delete:
case GDK_KEY_KP_Delete:
case GDK_KEY_BackSpace:
{
SPDocument *doc = guide->document;
sp_guide_remove(guide);
DocumentUndo::done(doc, SP_VERB_NONE, _("Delete guide"));
ret = TRUE;
sp_event_context_discard_delayed_snap_event(desktop->event_context);
break;
}
case GDK_KEY_Shift_L:
case GDK_KEY_Shift_R:
if (drag_type != SP_DRAG_MOVE_ORIGIN) {
GdkCursor *guide_cursor;
guide_cursor = gdk_cursor_new (GDK_EXCHANGE);
gdk_window_set_cursor(gtk_widget_get_window (GTK_WIDGET(desktop->getCanvas())), guide_cursor);
#if GTK_CHECK_VERSION(3,0,0)
g_object_unref(guide_cursor);
#else
gdk_cursor_unref(guide_cursor);
#endif
ret = TRUE;
break;
}
default:
// do nothing;
break;
}
break;
case GDK_KEY_RELEASE:
switch (Inkscape::UI::Tools::get_group0_keyval (&event->key)) {
case GDK_KEY_Shift_L:
case GDK_KEY_Shift_R:
GdkCursor *guide_cursor;
guide_cursor = gdk_cursor_new (GDK_EXCHANGE);
gdk_window_set_cursor(gtk_widget_get_window (GTK_WIDGET(desktop->getCanvas())), guide_cursor);
#if GTK_CHECK_VERSION(3,0,0)
g_object_unref(guide_cursor);
#else
gdk_cursor_unref(guide_cursor);
#endif
break;
default:
// do nothing;
break;
}
break;
default:
break;
}
return ret;
}
