Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::SnapCandidatePoint const &p,
Inkscape::Snapper::SnapConstraint const &constraint,
Geom::OptRect const &bbox_to_snap) const
{
// First project the mouse pointer onto the constraint
Geom::Point pp = constraint.projection(p.getPoint());
Inkscape::SnappedPoint no_snap = Inkscape::SnappedPoint(pp, p.getSourceType(), p.getSourceNum(), Inkscape::SNAPTARGET_CONSTRAINT, Geom::infinity(), 0, false, true, false);
if (!someSnapperMightSnap()) {
// Always return point on constraint
return no_snap;
}
Inkscape::SnappedPoint result = no_snap;
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
if ((prefs->getBool("/options/snapmousepointer/value", false)) && p.isSingleHandle()) {
// Snapping the mouse pointer instead of the constrained position of the knot allows
// to snap to things which don't intersect with the constraint line; this is basically
// then just a freesnap with the constraint applied afterwards
// We'll only do this if we're dragging a single handle, and for example not when transforming an object in the selector tool
result = freeSnap(p, bbox_to_snap);
if (result.getSnapped()) {
// only change the snap indicator if we really snapped to something
if (_snapindicator && _desktop) {
_desktop->snapindicator->set_new_snaptarget(result);
}
// Apply the constraint
result.setPoint(constraint.projection(result.getPoint()));
return result;
}
return no_snap;
}
IntermSnapResults isr;
SnapperList const snappers = getSnappers();
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); ++i) {
(*i)->constrainedSnap(isr, p, bbox_to_snap, constraint, &_items_to_ignore, _unselected_nodes);
}
result = findBestSnap(p, isr, true);
if (result.getSnapped()) {
// only change the snap indicator if we really snapped to something
if (_snapindicator && _desktop) {
_desktop->snapindicator->set_new_snaptarget(result);
}
return result;
}
return no_snap;
}
Inkscape::SnappedPoint SnapManager::constrainedAngularSnap(Inkscape::SnapCandidatePoint const &p,
boost::optional<Geom::Point> const &p_ref,
Geom::Point const &o,
unsigned const snaps) const
{
Inkscape::SnappedPoint sp;
if (snaps > 0) { // 0 means no angular snapping
// p is at an arbitrary angle. Now we should snap this angle to specific increments.
// For this we'll calculate the closest two angles, one at each side of the current angle
Geom::Line y_axis(Geom::Point(0, 0), Geom::Point(0, 1));
Geom::Line p_line(o, p.getPoint());
double angle = Geom::angle_between(y_axis, p_line);
double angle_incr = M_PI / snaps;
double angle_offset = 0;
if (p_ref) {
Geom::Line p_line_ref(o, *p_ref);
angle_offset = Geom::angle_between(y_axis, p_line_ref);
}
double angle_ceil = round_to_upper_multiple_plus(angle, angle_incr, angle_offset);
double angle_floor = round_to_lower_multiple_plus(angle, angle_incr, angle_offset);
// We have two angles now. The constrained snapper will try each of them and return the closest
// Now do the snapping...
std::vector<Inkscape::Snapper::SnapConstraint> constraints;
constraints.push_back(Inkscape::Snapper::SnapConstraint(Geom::Line(o, angle_ceil - M_PI/2)));
constraints.push_back(Inkscape::Snapper::SnapConstraint(Geom::Line(o, angle_floor - M_PI/2)));
sp = multipleConstrainedSnaps(p, constraints); // Constraints will always be applied, even if we didn't snap
if (!sp.getSnapped()) { // If we haven't snapped then we only had the constraint applied;
sp.setTarget(Inkscape::SNAPTARGET_CONSTRAINED_ANGLE);
}
} else {
sp = freeSnap(p);
}
return sp;
}
Geom::Point SnapManager::multipleOfGridPitch(Geom::Point const &t, Geom::Point const &origin)
{
if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally())
return t;
if (_desktop && _desktop->gridsEnabled()) {
bool success = false;
Geom::Point nearest_multiple;
Geom::Coord nearest_distance = Geom::infinity();
Inkscape::SnappedPoint bestSnappedPoint(t);
// It will snap to the grid for which we find the closest snap. This might be a different
// grid than to which the objects were initially aligned. I don't see an easy way to fix
// this, so when using multiple grids one can get unexpected results
// Cannot use getGridSnappers() because we need both the grids AND their snappers
// Therefore we iterate through all grids manually
for (std::vector<Inkscape::CanvasGrid *>::const_iterator it = _named_view->grids.begin(); it != _named_view->grids.end(); ++it) {
Inkscape::CanvasGrid *grid = (*it);
const Inkscape::Snapper* snapper = grid->snapper;
if (snapper && snapper->ThisSnapperMightSnap()) {
// To find the nearest multiple of the grid pitch for a given translation t, we
// will use the grid snapper. Simply snapping the value t to the grid will do, but
// only if the origin of the grid is at (0,0). If it's not then compensate for this
// in the translation t
Geom::Point const t_offset = t + grid->origin;
IntermSnapResults isr;
// Only the first three parameters are being used for grid snappers
snapper->freeSnap(isr, Inkscape::SnapCandidatePoint(t_offset, Inkscape::SNAPSOURCE_GRID_PITCH),Geom::OptRect(), NULL, NULL);
// Find the best snap for this grid, including intersections of the grid-lines
bool old_val = _snapindicator;
_snapindicator = false;
Inkscape::SnappedPoint s = findBestSnap(Inkscape::SnapCandidatePoint(t_offset, Inkscape::SNAPSOURCE_GRID_PITCH), isr, false, true);
_snapindicator = old_val;
if (s.getSnapped() && (s.getSnapDistance() < nearest_distance)) {
// use getSnapDistance() instead of getWeightedDistance() here because the pointer's position
// doesn't tell us anything about which node to snap
success = true;
nearest_multiple = s.getPoint() - grid->origin;
nearest_distance = s.getSnapDistance();
bestSnappedPoint = s;
}
}
}
if (success) {
bestSnappedPoint.setPoint(origin + nearest_multiple);
_desktop->snapindicator->set_new_snaptarget(bestSnappedPoint);
return nearest_multiple;
}
}
return t;
}
void SnapManager::preSnap(Inkscape::SnapCandidatePoint const &p, bool to_paths_only)
{
// setup() must have been called before calling this method!
if (_snapindicator) {
_snapindicator = false; // prevent other methods from drawing a snap indicator; we want to control this here
Inkscape::SnappedPoint s = freeSnap(p, Geom::OptRect(), to_paths_only);
g_assert(_desktop != NULL);
if (s.getSnapped()) {
_desktop->snapindicator->set_new_snaptarget(s, true);
} else {
_desktop->snapindicator->remove_snaptarget(true);
}
_snapindicator = true; // restore the original value
}
}
void SnapManager::guideFreeSnap(Geom::Point &p, Geom::Point &origin_or_vector, bool origin, bool freeze_angle) const
{
if (freeze_angle && origin) {
g_warning("Dear developer, when snapping guides you shouldn't ask me to freeze the guide's vector when you haven't specified one");
// You've supplied me with an origin instead of a vector
}
if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() || !snapprefs.isTargetSnappable(Inkscape::SNAPTARGET_GUIDE)) {
return;
}
Inkscape::SnapCandidatePoint candidate(p, Inkscape::SNAPSOURCE_GUIDE);
if (origin) {
candidate.addOrigin(origin_or_vector);
} else {
candidate = Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_GUIDE_ORIGIN);
candidate.addVector(Geom::rot90(origin_or_vector));
}
IntermSnapResults isr;
SnapperList snappers = getSnappers();
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); ++i) {
(*i)->freeSnap(isr, candidate, Geom::OptRect(), NULL, NULL);
}
Inkscape::SnappedPoint const s = findBestSnap(candidate, isr, false);
s.getPointIfSnapped(p);
if (!freeze_angle && s.getSnapped()) {
if (!Geom::are_near(s.getTangent(), Geom::Point(0,0))) { // If the tangent has been set ...
origin_or_vector = Geom::rot90(s.getTangent()); // then use it to update the normal of the guide
// PS: The tangent might not have been set if we snapped for example to a node
}
}
}
Geom::Rect Inkscape::snap_rectangular_box(SPDesktop const *desktop, SPItem *item,
Geom::Point const &pt, Geom::Point const ¢er, int state)
{
Geom::Point p[2];
bool const shift = state & GDK_SHIFT_MASK;
bool const control = state & GDK_CONTROL_MASK;
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop, false, item);
Inkscape::SnappedPoint snappoint;
if (control) {
/* Control is down: we are constrained to producing integer-ratio rectangles */
/* Vector from the centre of the box to the point we are dragging to */
Geom::Point delta = pt - center;
/* Round it so that we have an integer-ratio (or golden ratio) box */
if (fabs(delta[Geom::X]) > fabs(delta[Geom::Y]) && (delta[Geom::Y] != 0.0)) {
double ratio = delta[Geom::X] / delta[Geom::Y];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::X] = sign * goldenratio * delta[Geom::Y];
} else {
delta[Geom::X] = floor(ratio + 0.5) * delta[Geom::Y];
}
} else if (delta[Geom::X] != 0.0) {
double ratio = delta[Geom::Y] / delta[Geom::X];
double ratioabs = fabs (ratio);
double sign = (ratio < 0 ? -1 : 1);
if (midpt_1_goldenratio < ratioabs && ratioabs < midpt_goldenratio_2) {
delta[Geom::Y] = sign * goldenratio * delta[Geom::X];
} else {
delta[Geom::Y] = floor(delta[Geom::Y] / delta[Geom::X] + 0.5) * delta[Geom::X];
}
}
/* p[1] is the dragged point with the integer-ratio constraint */
p[1] = center + delta;
if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner
** point; this means that corner-point movements are bound to each other.
*/
/* p[0] is the opposite corner of our box */
p[0] = center - delta;
Inkscape::SnappedPoint s[2];
/* Try to snap p[0] (the opposite corner) along the constraint vector */
s[0] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::ConstraintLine(p[0] - p[1]));
/* Try to snap p[1] (the dragged corner) along the constraint vector */
s[1] = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::ConstraintLine(p[1] - p[0]));
/* Choose the best snap and update points accordingly */
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* Our origin is the opposite corner. Snap the drag point along the constraint vector */
p[0] = center;
snappoint = m.constrainedSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE),
Inkscape::Snapper::ConstraintLine(p[1] - p[0]));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
} else if (shift) {
/* Shift is down, so our origin is the centre point rather than the corner point;
** this means that corner-point movements are bound to each other.
*/
p[1] = pt;
p[0] = 2 * center - p[1];
Inkscape::SnappedPoint s[2];
s[0] = m.freeSnap(Inkscape::SnapCandidatePoint(p[0], Inkscape::SNAPSOURCE_NODE_HANDLE));
s[1] = m.freeSnap(Inkscape::SnapCandidatePoint(p[1], Inkscape::SNAPSOURCE_NODE_HANDLE));
if (s[0].getSnapDistance() < s[1].getSnapDistance()) {
if (s[0].getSnapped()) {
p[0] = s[0].getPoint();
p[1] = 2 * center - s[0].getPoint();
snappoint = s[0];
}
} else {
if (s[1].getSnapped()) {
p[0] = 2 * center - s[1].getPoint();
p[1] = s[1].getPoint();
snappoint = s[1];
}
}
} else {
/* There's no constraint on the corner point, so just snap it to anything */
p[0] = center;
p[1] = pt;
snappoint = m.freeSnap(Inkscape::SnapCandidatePoint(pt, Inkscape::SNAPSOURCE_NODE_HANDLE));
if (snappoint.getSnapped()) {
p[1] = snappoint.getPoint();
}
}
if (snappoint.getSnapped()) {
desktop->snapindicator->set_new_snaptarget(snappoint);
}
p[0] *= desktop->dt2doc();
p[1] *= desktop->dt2doc();
return Geom::Rect(Geom::Point(MIN(p[0][Geom::X], p[1][Geom::X]), MIN(p[0][Geom::Y], p[1][Geom::Y])),
Geom::Point(MAX(p[0][Geom::X], p[1][Geom::X]), MAX(p[0][Geom::Y], p[1][Geom::Y])));
}
Inkscape::SnappedPoint SnapManager::multipleConstrainedSnaps(Inkscape::SnapCandidatePoint const &p,
std::vector<Inkscape::Snapper::SnapConstraint> const &constraints,
bool dont_snap,
Geom::OptRect const &bbox_to_snap) const
{
Inkscape::SnappedPoint no_snap = Inkscape::SnappedPoint(p.getPoint(), p.getSourceType(), p.getSourceNum(), Inkscape::SNAPTARGET_CONSTRAINT, Geom::infinity(), 0, false, true, false);
if (constraints.size() == 0) {
return no_snap;
}
// We haven't tried to snap yet; we will first determine which constraint is closest to where we are now,
// i.e. lets find out which of the constraints yields the closest projection of point p
// Project the mouse pointer on each of the constraints
std::vector<Geom::Point> projections;
for (std::vector<Inkscape::Snapper::SnapConstraint>::const_iterator c = constraints.begin(); c != constraints.end(); ++c) {
// Project the mouse pointer onto the constraint; In case we don't snap then we will
// return the projection onto the constraint, such that the constraint is always enforced
Geom::Point pp = (*c).projection(p.getPoint());
projections.push_back(pp);
}
// Select the closest constraint
no_snap.setPoint(projections.front());
Inkscape::Snapper::SnapConstraint cc = constraints.front(); //closest constraint
std::vector<Inkscape::Snapper::SnapConstraint>::const_iterator c = constraints.begin();
std::vector<Geom::Point>::iterator pp = projections.begin();
for (; pp != projections.end(); ++pp) {
if (Geom::L2(*pp - p.getPoint()) < Geom::L2(no_snap.getPoint() - p.getPoint())) {
no_snap.setPoint(*pp); // Remember the projection onto the closest constraint
cc = *c; // Remember the closest constraint itself
}
++c;
}
if (!someSnapperMightSnap() || dont_snap) {
return no_snap;
}
IntermSnapResults isr;
SnapperList const snappers = getSnappers();
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
bool snap_mouse = prefs->getBool("/options/snapmousepointer/value", false);
Inkscape::SnappedPoint result = no_snap;
if (snap_mouse && p.isSingleHandle()) {
// Snapping the mouse pointer instead of the constrained position of the knot allows
// to snap to things which don't intersect with the constraint line; this is basically
// then just a freesnap with the constraint applied afterwards
// We'll only to this if we're dragging a single handle, and for example not when transforming an object in the selector tool
result = freeSnap(p, bbox_to_snap);
// Now apply the constraint afterwards
result.setPoint(cc.projection(result.getPoint()));
} else {
// Try to snap along the closest constraint
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); ++i) {
(*i)->constrainedSnap(isr, p, bbox_to_snap, cc, &_items_to_ignore,_unselected_nodes);
}
result = findBestSnap(p, isr, true);
}
return result.getSnapped() ? result : no_snap;
}
static gint
pencil_handle_motion_notify(SPPencilContext *const pc, GdkEventMotion const &mevent)
{
if ((mevent.state & GDK_CONTROL_MASK) && (mevent.state & GDK_BUTTON1_MASK)) {
// mouse was accidentally moved during Ctrl+click;
// ignore the motion and create a single point
pc->is_drawing = false;
return TRUE;
}
gint ret = FALSE;
SPDesktop *const dt = pc->desktop;
SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
if (event_context->space_panning || mevent.state & GDK_BUTTON2_MASK || mevent.state & GDK_BUTTON3_MASK) {
// allow scrolling
return FALSE;
}
if ( ( mevent.state & GDK_BUTTON1_MASK ) && !pc->grab && pc->is_drawing) {
/* Grab mouse, so release will not pass unnoticed */
pc->grab = SP_CANVAS_ITEM(dt->acetate);
sp_canvas_item_grab(pc->grab, ( GDK_KEY_PRESS_MASK | GDK_BUTTON_PRESS_MASK |
GDK_BUTTON_RELEASE_MASK |
GDK_POINTER_MOTION_MASK ),
NULL, mevent.time);
}
/* Find desktop coordinates */
Geom::Point p = dt->w2d(Geom::Point(mevent.x, mevent.y));
/* Test whether we hit any anchor. */
SPDrawAnchor *anchor = spdc_test_inside(pc, Geom::Point(mevent.x, mevent.y));
if (pencil_within_tolerance) {
Inkscape::Preferences *prefs = Inkscape::Preferences::get();
gint const tolerance = prefs->getIntLimited("/options/dragtolerance/value", 0, 0, 100);
if ( Geom::LInfty( Geom::Point(mevent.x,mevent.y) - pencil_drag_origin_w ) < tolerance ) {
return FALSE; // Do not drag if we're within tolerance from origin.
}
}
// Once the user has moved farther than tolerance from the original location
// (indicating they intend to move the object, not click), then always process the
// motion notify coordinates as given (no snapping back to origin)
pencil_within_tolerance = false;
switch (pc->state) {
case SP_PENCIL_CONTEXT_ADDLINE:
/* Set red endpoint */
if (anchor) {
p = anchor->dp;
} else {
Geom::Point ptnr(p);
spdc_endpoint_snap(pc, ptnr, mevent.state);
p = ptnr;
}
spdc_set_endpoint(pc, p);
ret = TRUE;
break;
default:
/* We may be idle or already freehand */
if ( mevent.state & GDK_BUTTON1_MASK && pc->is_drawing ) {
pc->state = SP_PENCIL_CONTEXT_FREEHAND;
if ( !pc->sa && !pc->green_anchor ) {
/* Create green anchor */
pc->green_anchor = sp_draw_anchor_new(pc, pc->green_curve, TRUE, pc->p[0]);
}
/** \todo
* fixme: I am not sure whether we want to snap to anchors
* in middle of freehand (Lauris)
*/
SnapManager &m = dt->namedview->snap_manager;
if (anchor) {
p = anchor->dp;
} else if ((mevent.state & GDK_SHIFT_MASK) == 0) {
m.setup(dt);
Inkscape::SnappedPoint const s = m.freeSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, p);
if (s.getSnapped()) {
s.getPoint(p);
pc->prev_snap_was_succesful = true;
} else {
pc->prev_snap_was_succesful = false;
}
}
if ( pc->npoints != 0) { // buttonpress may have happened before we entered draw context!
if (!(pc->prev_snap_was_succesful && m.snapprefs.getSnapPostponedGlobally())) {
// When snapping is enabled but temporarily on hold because the mouse is moving
// fast, then we don't want to add nodes off-grid
spdc_add_freehand_point(pc, p, mevent.state);
ret = TRUE;
}
}
if (anchor && !pc->anchor_statusbar) {
pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Release</b> here to close and finish the path."));
pc->anchor_statusbar = true;
} else if (!anchor && pc->anchor_statusbar) {
pc->_message_context->clear();
pc->anchor_statusbar = false;
} else if (!anchor) {
pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("Drawing a freehand path"));
}
} else {
if (anchor && !pc->anchor_statusbar) {
pc->_message_context->set(Inkscape::NORMAL_MESSAGE, _("<b>Drag</b> to continue the path from this point."));
pc->anchor_statusbar = true;
} else if (!anchor && pc->anchor_statusbar) {
pc->_message_context->clear();
pc->anchor_statusbar = false;
}
}
break;
}
return ret;
}
static gint
pencil_handle_button_press(SPPencilContext *const pc, GdkEventButton const &bevent)
{
gint ret = FALSE;
SPEventContext *event_context = SP_EVENT_CONTEXT(pc);
if ( bevent.button == 1 && !event_context->space_panning) {
SPDrawContext *dc = SP_DRAW_CONTEXT (pc);
SPDesktop *desktop = SP_EVENT_CONTEXT_DESKTOP(dc);
Inkscape::Selection *selection = sp_desktop_selection(desktop);
if (Inkscape::have_viable_layer(desktop, dc->_message_context) == false) {
return TRUE;
}
Geom::Point const button_w(bevent.x, bevent.y);
/* Find desktop coordinates */
Geom::Point p = pc->desktop->w2d(button_w);
/* Test whether we hit any anchor. */
SPDrawAnchor *anchor = spdc_test_inside(pc, button_w);
pencil_drag_origin_w = Geom::Point(bevent.x,bevent.y);
pencil_within_tolerance = true;
switch (pc->state) {
case SP_PENCIL_CONTEXT_ADDLINE:
/* Current segment will be finished with release */
ret = TRUE;
break;
default:
/* Set first point of sequence */
if (bevent.state & GDK_CONTROL_MASK) {
spdc_create_single_dot(event_context, p, "/tools/freehand/pencil", bevent.state);
ret = true;
break;
}
if (anchor) {
p = anchor->dp;
desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Continuing selected path"));
} else {
if (!(bevent.state & GDK_SHIFT_MASK)) {
// This is the first click of a new curve; deselect item so that
// this curve is not combined with it (unless it is drawn from its
// anchor, which is handled by the sibling branch above)
selection->clear();
desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Creating new path"));
SnapManager &m = desktop->namedview->snap_manager;
m.setup(desktop);
Inkscape::SnappedPoint const s = m.freeSnap(Inkscape::SnapPreferences::SNAPPOINT_NODE, p);
if (s.getSnapped()) {
s.getPoint(p);
pc->prev_snap_was_succesful = true;
} else {
pc->prev_snap_was_succesful = false;
}
} else if (selection->singleItem() && SP_IS_PATH(selection->singleItem())) {
desktop->messageStack()->flash(Inkscape::NORMAL_MESSAGE, _("Appending to selected path"));
}
}
pc->sa = anchor;
spdc_set_startpoint(pc, p);
ret = TRUE;
break;
}
pc->is_drawing = true;
}
return ret;
}