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diff --git a/src/snap.cpp b/src/snap.cpp
index 0d7a25ad6329bb1c42e0b6369338c31c5253b682..bcacb81e2328416447589344e395ee48408b52d5 100644 (file)
--- a/src/snap.cpp
+++ b/src/snap.cpp
* Frank Felfe <innerspace@iname.com>
* Nathan Hurst <njh@njhurst.com>
* Carl Hetherington <inkscape@carlh.net>
+ * Diederik van Lierop <mail@diedenrezi.nl>
*
* Copyright (C) 2006-2007 Johan Engelen <johan@shouraizou.nl>
* Copyrigth (C) 2004 Nathan Hurst
- * Copyright (C) 1999-2002 Authors
+ * Copyright (C) 1999-2010 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
#include "sp-namedview.h"
#include "snap.h"
#include "snapped-line.h"
-
-#include <libnr/nr-point-fns.h>
-#include <libnr/nr-scale-ops.h>
-#include <libnr/nr-values.h>
+#include "snapped-curve.h"
#include "display/canvas-grid.h"
+#include "display/snap-indicator.h"
#include "inkscape.h"
#include "desktop.h"
+#include "selection.h"
#include "sp-guide.h"
+#include "preferences.h"
+#include "event-context.h"
using std::vector;
/**
*/
SnapManager::SnapManager(SPNamedView const *v) :
- guide(v, 0),
- object(v, 0),
- _named_view(v),
- _include_item_center(false),
- _snap_enabled_globally(true)
-{
+ guide(this, 0),
+ object(this, 0),
+ snapprefs(),
+ _named_view(v)
+{
}
-
/**
+ * \brief Return a list of snappers
+ *
+ * Inkscape snaps to objects, grids, and guides. For each of these snap targets a
+ * separate class is used, which has been derived from the base Snapper class. The
+ * getSnappers() method returns a list of pointers to instances of this class. This
+ * list contains exactly one instance of the guide snapper and of the object snapper
+ * class, but any number of grid snappers (because each grid has its own snapper
+ * instance)
+ *
* \return List of snappers that we use.
*/
-SnapManager::SnapperList
+SnapManager::SnapperList
SnapManager::getSnappers() const
{
SnapManager::SnapperList s;
}
/**
+ * \brief Return a list of gridsnappers
+ *
+ * Each grid has its own instance of the snapper class. This way snapping can
+ * be enabled per grid individually. A list will be returned containing the
+ * pointers to these instances, but only for grids that are being displayed
+ * and for which snapping is enabled.
+ *
* \return List of gridsnappers that we use.
*/
-SnapManager::SnapperList
+SnapManager::SnapperList
SnapManager::getGridSnappers() const
{
SnapperList s;
- //FIXME: this code should actually do this: add new grid snappers that are active for this desktop. now it just adds all gridsnappers
- SPDesktop* desktop = SP_ACTIVE_DESKTOP;
- if (desktop && desktop->gridsEnabled()) {
+ if (_desktop && _desktop->gridsEnabled() && snapprefs.getSnapToGrids()) {
for ( GSList const *l = _named_view->grids; l != NULL; l = l->next) {
Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;
s.push_back(grid->snapper);
}
/**
- * \return true if one of the snappers will try to snap something.
+ * \brief Return true if any snapping might occur, whether its to grids, guides or objects
+ *
+ * Each snapper instance handles its own snapping target, e.g. grids, guides or
+ * objects. This method iterates through all these snapper instances and returns
+ * true if any of the snappers might possible snap, considering only the relevant
+ * snapping preferences.
+ *
+ * \return true if one of the snappers will try to snap to something.
*/
-bool SnapManager::SomeSnapperMightSnap() const
+bool SnapManager::someSnapperMightSnap() const
{
- if (!_snap_enabled_globally) {
+ if ( !snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() ) {
return false;
}
-
+
SnapperList const s = getSnappers();
SnapperList::const_iterator i = s.begin();
while (i != s.end() && (*i)->ThisSnapperMightSnap() == false) {
i++;
}
-
+
return (i != s.end());
}
-/*
- * The snappers have too many parameters to adjust individually. Therefore only
- * two snapping modes are presented to the user: snapping bounding box corners (to
- * other bounding boxes, grids or guides), and/or snapping nodes (to other nodes,
- * paths, grids or guides). To select either of these modes (or both), use the
- * methods defined below: setSnapModeBBox() and setSnapModeNode().
- *
- * */
-
+/**
+ * \return true if one of the grids might be snapped to.
+ */
-void SnapManager::setSnapModeBBox(bool enabled)
+bool SnapManager::gridSnapperMightSnap() const
{
- //The default values are being set in sp_namedview_set() (in sp-namedview.cpp)
- guide.setSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX, enabled);
-
- for ( GSList const *l = _named_view->grids; l != NULL; l = l->next) {
- Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;
- grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX, enabled);
- }
-
- object.setSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX, enabled);
- //object.setSnapToBBoxNode(enabled); // On second thought, these should be controlled
- //object.setSnapToBBoxPath(enabled); // separately by the snapping prefs dialog
- object.setStrictSnapping(true); //don't snap bboxes to nodes/paths and vice versa
-}
+ if ( !snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally() ) {
+ return false;
+ }
-bool SnapManager::getSnapModeBBox() const
-{
- return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX);
+ SnapperList const s = getGridSnappers();
+ SnapperList::const_iterator i = s.begin();
+ while (i != s.end() && (*i)->ThisSnapperMightSnap() == false) {
+ i++;
+ }
+
+ return (i != s.end());
}
-void SnapManager::setSnapModeNode(bool enabled)
+/**
+ * \brief Try to snap a point to grids, guides or objects.
+ *
+ * Try to snap a point to grids, guides or objects, in two degrees-of-freedom,
+ * i.e. snap in any direction on the two dimensional canvas to the nearest
+ * snap target. freeSnapReturnByRef() is equal in snapping behavior to
+ * freeSnap(), but the former returns the snapped point trough the referenced
+ * parameter p. This parameter p initially contains the position of the snap
+ * source and will we overwritten by the target position if snapping has occurred.
+ * This makes snapping transparent to the calling code. If this is not desired
+ * because either the calling code must know whether snapping has occurred, or
+ * because the original position should not be touched, then freeSnap() should be
+ * called instead.
+ *
+ * PS:
+ * 1) SnapManager::setup() must have been called before calling this method,
+ * but only once for a set of points
+ * 2) Only to be used when a single source point is to be snapped; it assumes
+ * that source_num = 0, which is inefficient when snapping sets our source points
+ *
+ * \param p Current position of the snap source; will be overwritten by the position of the snap target if snapping has occurred
+ * \param source_type Detailed description of the source type, will be used by the snap indicator
+ * \param bbox_to_snap Bounding box hulling the set of points, all from the same selection and having the same transformation
+ */
+
+void SnapManager::freeSnapReturnByRef(Geom::Point &p,
+ Inkscape::SnapSourceType const source_type,
+ Geom::OptRect const &bbox_to_snap) const
{
- guide.setSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE, enabled);
-
- for ( GSList const *l = _named_view->grids; l != NULL; l = l->next) {
- Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;
- grid->snapper->setSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE, enabled);
- }
-
- object.setSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE, enabled);
- //object.setSnapToItemNode(enabled); // On second thought, these should be controlled
- //object.setSnapToItemPath(enabled); // separately by the snapping prefs dialog
- object.setStrictSnapping(true);
+ Inkscape::SnappedPoint const s = freeSnap(Inkscape::SnapCandidatePoint(p, source_type), bbox_to_snap);
+ s.getPoint(p);
}
-bool SnapManager::getSnapModeNode() const
+
+/**
+ * \brief Try to snap a point to grids, guides or objects.
+ *
+ * Try to snap a point to grids, guides or objects, in two degrees-of-freedom,
+ * i.e. snap in any direction on the two dimensional canvas to the nearest
+ * snap target. freeSnap() is equal in snapping behavior to
+ * freeSnapReturnByRef(). Please read the comments of the latter for more details
+ *
+ * PS: SnapManager::setup() must have been called before calling this method,
+ * but only once for a set of points
+ *
+ * \param p Source point to be snapped
+ * \param bbox_to_snap Bounding box hulling the set of points, all from the same selection and having the same transformation
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics
+ */
+
+
+Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::SnapCandidatePoint const &p,
+ Geom::OptRect const &bbox_to_snap) const
{
- return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE);
+ if (!someSnapperMightSnap()) {
+ return Inkscape::SnappedPoint(p, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false, false, false);
+ }
+
+ SnappedConstraints sc;
+ SnapperList const snappers = getSnappers();
+
+ for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
+ (*i)->freeSnap(sc, p, bbox_to_snap, &_items_to_ignore, _unselected_nodes);
+ }
+
+ return findBestSnap(p, sc, false);
}
-void SnapManager::setSnapModeGuide(bool enabled)
+void SnapManager::preSnap(Inkscape::SnapCandidatePoint const &p)
{
- object.setSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE, enabled);
+ // 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);
+ if (s.getSnapped()) {
+ _desktop->snapindicator->set_new_snaptarget(s, true);
+ } else {
+ _desktop->snapindicator->remove_snaptarget(true);
+ }
+ _snapindicator = true; // restore the original value
+ }
}
-bool SnapManager::getSnapModeGuide() const
+/**
+ * \brief Snap to the closest multiple of a grid pitch
+ *
+ * When pasting, we would like to snap to the grid. Problem is that we don't know which
+ * nodes were aligned to the grid at the time of copying, so we don't know which nodes
+ * to snap. If we'd snap an unaligned node to the grid, previously aligned nodes would
+ * become unaligned. That's undesirable. Instead we will make sure that the offset
+ * between the source and its pasted copy is a multiple of the grid pitch. If the source
+ * was aligned, then the copy will therefore also be aligned.
+ *
+ * PS: Whether we really find a multiple also depends on the snapping range! Most users
+ * will have "always snap" enabled though, in which case a multiple will always be found.
+ * PS2: When multiple grids are present then the result will become ambiguous. There is no
+ * way to control to which grid this method will snap.
+ *
+ * \param t Vector that represents the offset of the pasted copy with respect to the original
+ * \return Offset vector after snapping to the closest multiple of a grid pitch
+ */
+
+Geom::Point SnapManager::multipleOfGridPitch(Geom::Point const &t, Geom::Point const &origin)
{
- return object.getSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE);
+ if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally())
+ return t;
+
+ if (_desktop && _desktop->gridsEnabled()) {
+ bool success = false;
+ Geom::Point nearest_multiple;
+ Geom::Coord nearest_distance = NR_HUGE;
+ 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 (GSList const *l = _named_view->grids; l != NULL; l = l->next) {
+ Inkscape::CanvasGrid *grid = (Inkscape::CanvasGrid*) l->data;
+ 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;
+ SnappedConstraints sc;
+ // Only the first three parameters are being used for grid snappers
+ snapper->freeSnap(sc, 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), sc, false, 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() - to_2geom(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;
}
/**
- * Try to snap a point to any interested snappers.
+ * \brief Try to snap a point along a constraint line to grids, guides or objects.
*
- * \param t Type of point.
- * \param p Point.
- * \param it Item to ignore when snapping.
- * \return Snapped point.
- */
+ * Try to snap a point to grids, guides or objects, in only one degree-of-freedom,
+ * i.e. snap in a specific direction on the two dimensional canvas to the nearest
+ * snap target.
+ *
+ * constrainedSnapReturnByRef() is equal in snapping behavior to
+ * constrainedSnap(), but the former returns the snapped point trough the referenced
+ * parameter p. This parameter p initially contains the position of the snap
+ * source and will we overwritten by the target position if snapping has occurred.
+ * This makes snapping transparent to the calling code. If this is not desired
+ * because either the calling code must know whether snapping has occurred, or
+ * because the original position should not be touched, then constrainedSnap() should
+ * be called instead.
+ *
+ * PS:
+ * 1) SnapManager::setup() must have been called before calling this method,
+ * but only once for a set of points
+ * 2) Only to be used when a single source point is to be snapped; it assumes
+ * that source_num = 0, which is inefficient when snapping sets our source points
-Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- SPItem const *it) const
+ *
+ * \param p Current position of the snap source; will be overwritten by the position of the snap target if snapping has occurred
+ * \param source_type Detailed description of the source type, will be used by the snap indicator
+ * \param constraint The direction or line along which snapping must occur
+ * \param bbox_to_snap Bounding box hulling the set of points, all from the same selection and having the same transformation
+ */
+void SnapManager::constrainedSnapReturnByRef(Geom::Point &p,
+ Inkscape::SnapSourceType const source_type,
+ Inkscape::Snapper::SnapConstraint const &constraint,
+ Geom::OptRect const &bbox_to_snap) const
{
- std::list<SPItem const *> lit;
- lit.push_back(it);
-
- std::vector<NR::Point> points_to_snap;
- points_to_snap.push_back(p);
-
- return freeSnap(t, p, true, points_to_snap, lit);
+ Inkscape::SnappedPoint const s = constrainedSnap(Inkscape::SnapCandidatePoint(p, source_type, 0), constraint, bbox_to_snap);
+ s.getPoint(p);
}
/**
- * Try to snap a point to any of the specified snappers.
- *
- * \param t Type of point.
- * \param p Point.
- * \param first_point If true then this point is the first one from a whole bunch of points
- * \param points_to_snap The whole bunch of points, all from the same selection and having the same transformation
- * \param it List of items to ignore when snapping.
- * \param snappers List of snappers to try to snap to
- * \return Snapped point.
+ * \brief Try to snap a point along a constraint line to grids, guides or objects.
+ *
+ * Try to snap a point to grids, guides or objects, in only one degree-of-freedom,
+ * i.e. snap in a specific direction on the two dimensional canvas to the nearest
+ * snap target. constrainedSnap is equal in snapping behavior to
+ * constrainedSnapReturnByRef(). Please read the comments of the latter for more details.
+ *
+ * PS: SnapManager::setup() must have been called before calling this method,
+ * but only once for a set of points
+ *
+ * \param p Source point to be snapped
+ * \param constraint The direction or line along which snapping must occur
+ * \param bbox_to_snap Bounding box hulling the set of points, all from the same selection and having the same transformation
*/
-Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- bool const &first_point,
- std::vector<NR::Point> &points_to_snap,
- std::list<SPItem const *> const &it) const
+Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::SnapCandidatePoint const &p,
+ Inkscape::Snapper::SnapConstraint const &constraint,
+ Geom::OptRect const &bbox_to_snap) const
{
-
- SnappedConstraints sc;
-
- SnapperList const snappers = getSnappers();
+ // 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, NR_HUGE, 0, false, true, false);
+ if (!someSnapperMightSnap()) {
+ // Always return point on constraint
+ return no_snap;
+ }
+
+ SnappedConstraints sc;
+ SnapperList const snappers = getSnappers();
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
- (*i)->freeSnap(sc, t, p, first_point, points_to_snap, it);
+ (*i)->constrainedSnap(sc, p, bbox_to_snap, constraint, &_items_to_ignore);
}
- return findBestSnap(p, sc, false);
+ Inkscape::SnappedPoint result = findBestSnap(p, sc, true);
+
+ if (result.getSnapped()) {
+ // only change the snap indicator if we really snapped to something
+ if (_snapindicator) {
+ _desktop->snapindicator->set_new_snaptarget(result);
+ }
+ return result;
+ }
+ return no_snap;
}
-/**
- * Try to snap a point to any interested snappers. A snap will only occur along
- * a line described by a Inkscape::Snapper::ConstraintLine.
- *
- * \param t Type of point.
- * \param p Point.
- * \param c Constraint line.
- * \param it Item to ignore when snapping.
- * \return Snapped point.
+/* See the documentation for constrainedSnap() directly above for more details.
+ * The difference is that multipleConstrainedSnaps() will take a list of constraints instead of a single one,
+ * and will try to snap the SnapCandidatePoint to all of the provided constraints and see which one fits best
+ * \param p Source point to be snapped
+ * \param constraints List of directions or lines along which snapping must occur
+ * \param bbox_to_snap Bounding box hulling the set of points, all from the same selection and having the same transformation
*/
-Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- Inkscape::Snapper::ConstraintLine const &c,
- SPItem const *it) const
+
+Inkscape::SnappedPoint SnapManager::multipleConstrainedSnaps(Inkscape::SnapCandidatePoint const &p,
+ std::vector<Inkscape::Snapper::SnapConstraint> const &constraints,
+ Geom::OptRect const &bbox_to_snap) const
{
- std::list<SPItem const *> lit;
- lit.push_back(it);
-
- std::vector<NR::Point> points_to_snap;
- points_to_snap.push_back(p);
-
- return constrainedSnap(t, p, true, points_to_snap, c, lit);
-}
+ Inkscape::SnappedPoint no_snap = Inkscape::SnappedPoint(p.getPoint(), p.getSourceType(), p.getSourceNum(), Inkscape::SNAPTARGET_CONSTRAINT, NR_HUGE, 0, false, true, false);
+ if (constraints.size() == 0) {
+ return no_snap;
+ }
+
+ SnappedConstraints sc;
+ SnapperList const snappers = getSnappers();
+ std::vector<Geom::Point> projections;
+ bool snapping_is_futile = !someSnapperMightSnap();
+
+ // Iterate over the constraints
+ 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);
+ // Try to snap to the constraint
+ if (!snapping_is_futile) {
+ for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
+ (*i)->constrainedSnap(sc, p, bbox_to_snap, *c, &_items_to_ignore);
+ }
+ }
+ }
+
+ Inkscape::SnappedPoint result = findBestSnap(p, sc, true);
+ if (result.getSnapped()) {
+ // only change the snap indicator if we really snapped to something
+ if (_snapindicator) {
+ _desktop->snapindicator->set_new_snaptarget(result);
+ }
+ return result;
+ }
+
+ // So we didn't snap, but we still need to return a point on one of the constraints
+ // Find out which of the constraints yielded the closest projection of point p
+ no_snap.setPoint(projections.front());
+ for (std::vector<Geom::Point>::iterator pp = projections.begin(); pp != projections.end(); pp++) {
+ if (pp != projections.begin()) {
+ if (Geom::L2(*pp - p.getPoint()) < Geom::L2(no_snap.getPoint() - p.getPoint())) {
+ no_snap.setPoint(*pp);
+ }
+ }
+ }
+
+ return no_snap;
+}
/**
- * Try to snap a point to any interested snappers. A snap will only occur along
- * a line described by a Inkscape::Snapper::ConstraintLine.
- *
- * \param t Type of point.
- * \param p Point.
- * \param first_point If true then this point is the first one from a whole bunch of points
- * \param points_to_snap The whole bunch of points, all from the same selection and having the same transformation
- * \param c Constraint line.
- * \param it List of items to ignore when snapping.
- * \return Snapped point.
+ * \brief Try to snap a point of a guide to another guide or to a node
+ *
+ * Try to snap a point of a guide to another guide or to a node in two degrees-
+ * of-freedom, i.e. snap in any direction on the two dimensional canvas to the
+ * nearest snap target. This method is used when dragging or rotating a guide
+ *
+ * PS: SnapManager::setup() must have been called before calling this method,
+ *
+ * \param p Current position of the point on the guide that is to be snapped; will be overwritten by the position of the snap target if snapping has occurred
+ * \param guide_normal Vector normal to the guide line
*/
-
-Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- bool const &first_point,
- std::vector<NR::Point> &points_to_snap,
- Inkscape::Snapper::ConstraintLine const &c,
- std::list<SPItem const *> const &it) const
+void SnapManager::guideFreeSnap(Geom::Point &p, Geom::Point const &guide_normal, SPGuideDragType drag_type) const
{
-
+ if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally()) {
+ return;
+ }
+
+ if (!(object.ThisSnapperMightSnap() || snapprefs.getSnapToGuides())) {
+ return;
+ }
+
+ Inkscape::SnapCandidatePoint candidate(p, Inkscape::SNAPSOURCE_GUIDE_ORIGIN);
+ if (drag_type == SP_DRAG_ROTATE) {
+ candidate = Inkscape::SnapCandidatePoint(p, Inkscape::SNAPSOURCE_GUIDE);
+ }
+
+ // Snap to nodes
SnappedConstraints sc;
-
- SnapperList const snappers = getSnappers();
+ if (object.ThisSnapperMightSnap()) {
+ object.guideFreeSnap(sc, p, guide_normal);
+ }
+
+ // Snap to guides & grid lines
+ SnapperList snappers = getGridSnappers();
+ snappers.push_back(&guide);
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
- (*i)->constrainedSnap(sc, t, p, first_point, points_to_snap, c, it);
+ (*i)->freeSnap(sc, candidate, Geom::OptRect(), NULL, NULL);
}
- return findBestSnap(p, sc, true);
+ Inkscape::SnappedPoint const s = findBestSnap(candidate, sc, false, false);
+
+ s.getPoint(p);
}
-Inkscape::SnappedPoint SnapManager::guideSnap(NR::Point const &p,
- NR::Point const &guide_normal) const
+/**
+ * \brief Try to snap a point on a guide to the intersection with another guide or a path
+ *
+ * Try to snap a point on a guide to the intersection of that guide with another
+ * guide or with a path. The snapped point will lie somewhere on the guide-line,
+ * making this is a constrained snap, i.e. in only one degree-of-freedom.
+ * This method is used when dragging the origin of the guide along the guide itself.
+ *
+ * PS: SnapManager::setup() must have been called before calling this method,
+ *
+ * \param p Current position of the point on the guide that is to be snapped; will be overwritten by the position of the snap target if snapping has occurred
+ * \param guide_normal Vector normal to the guide line
+ */
+
+void SnapManager::guideConstrainedSnap(Geom::Point &p, SPGuide const &guideline) const
{
-
- // This method is used to snap a guide to nodes, while dragging the guide around
- Inkscape::ObjectSnapper::DimensionToSnap snap_dim;
- if (guide_normal == component_vectors[NR::Y]) {
- snap_dim = Inkscape::ObjectSnapper::SNAP_Y;
- } else if (guide_normal == component_vectors[NR::X]) {
- snap_dim = Inkscape::ObjectSnapper::SNAP_X;
- } else {
- g_warning("WARNING: snapping of angled guides is not supported yet!");
- // this is because _snapnodes, called in object.guideSnap, cannot only handle
- // vertical or horizontal lines for now....
- // Rotating an agled guide will require some additional code, as it would be great to
- // have it rotate around a snapped point
- snap_dim = Inkscape::ObjectSnapper::SNAP_XY;
- }
-
+ if (!snapprefs.getSnapEnabledGlobally() || snapprefs.getSnapPostponedGlobally()) {
+ return;
+ }
+
+ if (!(object.ThisSnapperMightSnap() || snapprefs.getSnapToGuides())) {
+ return;
+ }
+
+ Inkscape::SnapCandidatePoint candidate(p, Inkscape::SNAPSOURCE_GUIDE_ORIGIN, Inkscape::SNAPTARGET_UNDEFINED);
+
+ // Snap to nodes or paths
SnappedConstraints sc;
- object.guideSnap(sc, p, snap_dim);
-
- return findBestSnap(p, sc, false);
-}
+ Inkscape::Snapper::SnapConstraint cl(guideline.point_on_line, Geom::rot90(guideline.normal_to_line));
+ if (object.ThisSnapperMightSnap()) {
+ object.constrainedSnap(sc, candidate, Geom::OptRect(), cl, NULL);
+ }
+ // Snap to guides & grid lines
+ SnapperList snappers = getGridSnappers();
+ snappers.push_back(&guide);
+ for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
+ (*i)->constrainedSnap(sc, candidate, Geom::OptRect(), cl, NULL);
+ }
+
+ Inkscape::SnappedPoint const s = findBestSnap(candidate, sc, false);
+ s.getPoint(p);
+}
/**
- * Main internal snapping method, which is called by the other, friendlier, public
- * methods. It's a bit hairy as it has lots of parameters, but it saves on a lot
- * of duplicated code.
- *
- * \param type Type of points being snapped.
- * \param points List of points to snap.
- * \param ignore List of items to ignore while snapping.
- * \param constrained true if the snap is constrained.
- * \param constraint Constraint line to use, if `constrained' is true, otherwise undefined.
+ * \brief Method for snapping sets of points while they are being transformed
+ *
+ * Method for snapping sets of points while they are being transformed, when using
+ * for example the selector tool. This method is for internal use only, and should
+ * not have to be called directly. Use freeSnapTransalation(), constrainedSnapScale(),
+ * etc. instead.
+ *
+ * This is what is being done in this method: transform each point, find out whether
+ * a free snap or constrained snap is more appropriate, do the snapping, calculate
+ * some metrics to quantify the snap "distance", and see if it's better than the
+ * previous snap. Finally, the best ("nearest") snap from all these points is returned.
+ *
+ * \param points Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param constrained true if the snap is constrained, e.g. for stretching or for purely horizontal translation.
+ * \param constraint The direction or line along which snapping must occur, if 'constrained' is true; otherwise undefined.
* \param transformation_type Type of transformation to apply to points before trying to snap them.
* \param transformation Description of the transformation; details depend on the type.
* \param origin Origin of the transformation, if applicable.
- * \param dim Dimension of the transformation, if applicable.
- * \param uniform true if the transformation should be uniform, if applicable.
+ * \param dim Dimension to which the transformation applies, if applicable.
+ * \param uniform true if the transformation should be uniform; only applicable for stretching and scaling.
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::Point, bool> SnapManager::_snapTransformed(
- Inkscape::Snapper::PointType type,
- std::vector<NR::Point> const &points,
- std::list<SPItem const *> const &ignore,
+Inkscape::SnappedPoint SnapManager::_snapTransformed(
+ std::vector<Inkscape::SnapCandidatePoint> const &points,
+ Geom::Point const &pointer,
bool constrained,
- Inkscape::Snapper::ConstraintLine const &constraint,
+ Inkscape::Snapper::SnapConstraint const &constraint,
Transformation transformation_type,
- NR::Point const &transformation,
- NR::Point const &origin,
- NR::Dim2 dim,
+ Geom::Point const &transformation,
+ Geom::Point const &origin,
+ Geom::Dim2 dim,
bool uniform) const
{
/* We have a list of points, which we are proposing to transform in some way. We need to see
*/
/* Quick check to see if we have any snappers that are enabled
- ** Also used to globally disable all snapping
+ ** Also used to globally disable all snapping
*/
- if (SomeSnapperMightSnap() == false) {
- return std::make_pair(transformation, false);
+ if (someSnapperMightSnap() == false || points.size() == 0) {
+ return Inkscape::SnappedPoint(pointer);
}
-
- std::vector<NR::Point> transformed_points;
-
- for (std::vector<NR::Point>::const_iterator i = points.begin(); i != points.end(); i++) {
+
+ std::vector<Inkscape::SnapCandidatePoint> transformed_points;
+ Geom::Rect bbox;
+
+ long source_num = 0;
+ for (std::vector<Inkscape::SnapCandidatePoint>::const_iterator i = points.begin(); i != points.end(); i++) {
/* Work out the transformed version of this point */
- NR::Point transformed;
- switch (transformation_type) {
- case TRANSLATION:
- transformed = *i + transformation;
- break;
- case SCALE:
- transformed = ((*i - origin) * NR::scale(transformation[NR::X], transformation[NR::Y])) + origin;
- break;
- case STRETCH:
- {
- NR::scale s(1, 1);
- if (uniform)
- s[NR::X] = s[NR::Y] = transformation[dim];
- else {
- s[dim] = transformation[dim];
- s[1 - dim] = 1;
- }
- transformed = ((*i - origin) * s) + origin;
- break;
- }
- case SKEW:
- transformed = *i;
- transformed[dim] += transformation[dim] * ((*i)[1 - dim] - origin[1 - dim]);
- break;
- default:
- g_assert_not_reached();
- }
-
+ Geom::Point transformed = _transformPoint(*i, transformation_type, transformation, origin, dim, uniform);
+
// add the current transformed point to the box hulling all transformed points
- transformed_points.push_back(transformed);
- }
-
+ if (i == points.begin()) {
+ bbox = Geom::Rect(transformed, transformed);
+ } else {
+ bbox.expandTo(transformed);
+ }
+
+ transformed_points.push_back(Inkscape::SnapCandidatePoint(transformed, (*i).getSourceType(), source_num));
+ source_num++;
+ }
+
/* The current best transformation */
- NR::Point best_transformation = transformation;
+ Geom::Point best_transformation = transformation;
/* The current best metric for the best transformation; lower is better, NR_HUGE
** means that we haven't snapped anything.
*/
- NR::Coord best_metric = NR_HUGE;
- NR::Coord best_second_metric = NR_HUGE;
- bool best_at_intersection = false;
+ Geom::Point best_scale_metric(NR_HUGE, NR_HUGE);
+ Inkscape::SnappedPoint best_snapped_point;
+ g_assert(best_snapped_point.getAlwaysSnap() == false); // Check initialization of snapped point
+ g_assert(best_snapped_point.getAtIntersection() == false);
+
+ // Warnings for the devs
+ if (constrained && transformation_type == SCALE && !uniform) {
+ g_warning("Non-uniform constrained scaling is not supported!");
+ }
- std::vector<NR::Point>::const_iterator j = transformed_points.begin();
+ if (!constrained && transformation_type == ROTATE) {
+ // We do not yet allow for simultaneous rotation and scaling
+ g_warning("Unconstrained rotation is not supported!");
+ }
+
+ std::vector<Inkscape::SnapCandidatePoint>::iterator j = transformed_points.begin();
- //std::cout << std::endl;
+ // std::cout << std::endl;
+ bool first_free_snap = true;
+ for (std::vector<Inkscape::SnapCandidatePoint>::const_iterator i = points.begin(); i != points.end(); i++) {
- for (std::vector<NR::Point>::const_iterator i = points.begin(); i != points.end(); i++) {
-
/* Snap it */
- Inkscape::SnappedPoint const snapped = constrained ?
- constrainedSnap(type, *j, i == points.begin(), transformed_points, constraint, ignore) : freeSnap(type, *j, i == points.begin(), transformed_points, ignore);
-
- NR::Point result;
- NR::Coord metric = NR_HUGE;
- NR::Coord second_metric = NR_HUGE;
-
- if (snapped.getDistance() < NR_HUGE) {
+ Inkscape::SnappedPoint snapped_point;
+ Inkscape::Snapper::SnapConstraint dedicated_constraint = constraint;
+ Geom::Point const b = ((*i).getPoint() - origin); // vector to original point (not the transformed point! required for rotations!)
+
+ if (constrained) {
+ if (((transformation_type == SCALE || transformation_type == STRETCH) && uniform)) {
+ // When uniformly scaling, each point will have its own unique constraint line,
+ // running from the scaling origin to the original untransformed point. We will
+ // calculate that line here
+ dedicated_constraint = Inkscape::Snapper::SnapConstraint(origin, b);
+ } else if (transformation_type == ROTATE) {
+ Geom::Coord r = Geom::L2(b); // the radius of the circular constraint
+ if (r < 1e-9) { // points too close to the rotation center will not move. Don't try to snap these
+ // as they will always yield a perfect snap result if they're already snapped beforehand (e.g.
+ // when the transformation center has been snapped to a grid intersection in the selector tool)
+ continue; // skip this SnapCandidate and continue with the next one
+ // PS1: Apparently we don't have to do this for skewing, but why?
+ // PS2: We cannot easily filter these points upstream, e.g. in the grab() method (seltrans.cpp)
+ // because the rotation center will change when pressing shift, and grab() won't be recalled.
+ // Filtering could be done in handleRequest() (again in seltrans.cpp), by iterating through
+ // the snap candidates. But hey, we're iterating here anyway.
+ }
+ dedicated_constraint = Inkscape::Snapper::SnapConstraint(origin, b, r);
+ } else if (transformation_type == STRETCH) { // when non-uniform stretching {
+ dedicated_constraint = Inkscape::Snapper::SnapConstraint((*i).getPoint(), component_vectors[dim]);
+ } else if (transformation_type == TRANSLATE) {
+ // When doing a constrained translation, all points will move in the same direction, i.e.
+ // either horizontally or vertically. The lines along which they move are therefore all
+ // parallel, but might not be colinear. Therefore we will have to specify the point through
+ // which the constraint-line runs here, for each point individually. (we could also have done this
+ // earlier on, e.g. in seltrans.cpp but we're being lazy there and don't want to add an iteration loop)
+ dedicated_constraint = Inkscape::Snapper::SnapConstraint((*i).getPoint(), constraint.getDirection());
+ } // else: leave the original constraint, e.g. for skewing
+ snapped_point = constrainedSnap(*j, dedicated_constraint, bbox);
+ } else {
+ bool const c1 = fabs(b[Geom::X]) < 1e-6;
+ bool const c2 = fabs(b[Geom::Y]) < 1e-6;
+ if (transformation_type == SCALE && (c1 || c2) && !(c1 && c2)) {
+ // When scaling, a point aligned either horizontally or vertically with the origin can only
+ // move in that specific direction; therefore it should only snap in that direction, otherwise
+ // we will get snapped points with an invalid transformation
+ dedicated_constraint = Inkscape::Snapper::SnapConstraint(origin, component_vectors[c1]);
+ snapped_point = constrainedSnap(*j, dedicated_constraint, bbox);
+ } else {
+ // If we have a collection of SnapCandidatePoints, with mixed constrained snapping and free snapping
+ // requirements, then freeSnap might never see the SnapCandidatePoint with source_num == 0. The freeSnap()
+ // method in the object snapper depends on this, because only for source-num == 0 the target nodes will
+ // be collected. Therefore we enforce that the first SnapCandidatePoint that is to be freeSnapped always
+ // has source_num == 0;
+ // TODO: This is a bit ugly so fix this; do we need sourcenum for anything else? if we don't then get rid
+ // of it and explicitely communicate to the object snapper that this is a first point
+ if (first_free_snap) {
+ (*j).setSourceNum(0);
+ first_free_snap = false;
+ }
+ snapped_point = freeSnap(*j, bbox);
+ }
+ }
+ // std::cout << "dist = " << snapped_point.getSnapDistance() << std::endl;
+ snapped_point.setPointerDistance(Geom::L2(pointer - (*i).getPoint()));
+
+ Geom::Point result;
+
+ if (snapped_point.getSnapped()) {
/* We snapped. Find the transformation that describes where the snapped point has
** ended up, and also the metric for this transformation.
*/
+ Geom::Point const a = snapped_point.getPoint() - origin; // vector to snapped point
+ //Geom::Point const b = (*i - origin); // vector to original point
+
switch (transformation_type) {
- case TRANSLATION:
- result = snapped.getPoint() - *i;
- /* Consider the case in which a box is almost aligned with a grid in both
+ case TRANSLATE:
+ result = snapped_point.getPoint() - (*i).getPoint();
+ /* Consider the case in which a box is almost aligned with a grid in both
* horizontal and vertical directions. The distance to the intersection of
* the grid lines will always be larger then the distance to a single grid
- * line. If we prefer snapping to an intersection instead of to a single
- * grid line, then we cannot use "metric = NR::L2(result)". Therefore the
+ * line. If we prefer snapping to an intersection instead of to a single
+ * grid line, then we cannot use "metric = Geom::L2(result)". Therefore the
* snapped distance will be used as a metric. Please note that the snapped
* distance is defined as the distance to the nearest line of the intersection,
- * and not to the intersection itself!
+ * and not to the intersection itself!
*/
- metric = snapped.getDistance(); //used to be: metric = NR::L2(result);
- second_metric = snapped.getSecondDistance();
+ // Only for translations, the relevant metric will be the real snapped distance,
+ // so we don't have to do anything special here
break;
case SCALE:
{
- NR::Point const a = (snapped.getPoint() - origin);
- NR::Point const b = (*i - origin);
- result = NR::Point(a[NR::X] / b[NR::X], a[NR::Y] / b[NR::Y]);
- metric = std::abs(NR::L2(result) - NR::L2(transformation));
+ result = Geom::Point(NR_HUGE, NR_HUGE);
+ // If this point *i is horizontally or vertically aligned with
+ // the origin of the scaling, then it will scale purely in X or Y
+ // We can therefore only calculate the scaling in this direction
+ // and the scaling factor for the other direction should remain
+ // untouched (unless scaling is uniform of course)
+ for (int index = 0; index < 2; index++) {
+ if (fabs(b[index]) > 1e-6) { // if SCALING CAN occur in this direction
+ if (fabs(fabs(a[index]/b[index]) - fabs(transformation[index])) > 1e-12) { // if SNAPPING DID occur in this direction
+ result[index] = a[index] / b[index]; // then calculate it!
+ }
+ // we might leave result[1-index] = NR_HUGE
+ // if scaling didn't occur in the other direction
+ }
+ }
+ if (uniform) {
+ if (fabs(result[0]) < fabs(result[1])) {
+ result[1] = result[0];
+ } else {
+ result[0] = result[1];
+ }
+ }
+ // Compare the resulting scaling with the desired scaling
+ Geom::Point scale_metric = Geom::abs(result - transformation); // One or both of its components might be NR_HUGE
+ snapped_point.setSnapDistance(std::min(scale_metric[0], scale_metric[1]));
+ snapped_point.setSecondSnapDistance(std::max(scale_metric[0], scale_metric[1]));
break;
}
case STRETCH:
- {
- for (int a = 0; a < 2; a++) {
- if (uniform || a == dim) {
- result[a] = (snapped.getPoint()[dim] - origin[dim]) / ((*i)[dim] - origin[dim]);
- } else {
- result[a] = 1;
+ result = Geom::Point(NR_HUGE, NR_HUGE);
+ if (fabs(b[dim]) > 1e-6) { // if STRETCHING will occur for this point
+ result[dim] = a[dim] / b[dim];
+ result[1-dim] = uniform ? result[dim] : 1;
+ } else { // STRETCHING might occur for this point, but only when the stretching is uniform
+ if (uniform && fabs(b[1-dim]) > 1e-6) {
+ result[1-dim] = a[1-dim] / b[1-dim];
+ result[dim] = result[1-dim];
}
}
- metric = std::abs(result[dim] - transformation[dim]);
+ // Store the metric for this transformation as a virtual distance
+ snapped_point.setSnapDistance(std::abs(result[dim] - transformation[dim]));
+ snapped_point.setSecondSnapDistance(NR_HUGE);
break;
- }
case SKEW:
- result[dim] = (snapped.getPoint()[dim] - (*i)[dim]) / ((*i)[1 - dim] - origin[1 - dim]);
- metric = std::abs(result[dim] - transformation[dim]);
+ result[0] = (snapped_point.getPoint()[dim] - ((*i).getPoint())[dim]) / b[1 - dim]; // skew factor
+ result[1] = transformation[1]; // scale factor
+ // Store the metric for this transformation as a virtual distance
+ snapped_point.setSnapDistance(std::abs(result[0] - transformation[0]));
+ snapped_point.setSecondSnapDistance(NR_HUGE);
+ break;
+ case ROTATE:
+ // a is vector to snapped point; b is vector to original point; now lets calculate angle between a and b
+ result[0] = atan2(Geom::dot(Geom::rot90(b), a), Geom::dot(b, a));
+ result[1] = result[1]; // how else should we store an angle in a point ;-)
+ // Store the metric for this transformation as a virtual distance (we're storing an angle)
+ snapped_point.setSnapDistance(std::abs(result[0] - transformation[0]));
+ snapped_point.setSecondSnapDistance(NR_HUGE);
break;
default:
g_assert_not_reached();
}
-
- /* Note it if it's the best so far */
- bool const c1 = metric < best_metric;
- bool const c2 = metric == best_metric && snapped.getAtIntersection() == true && best_at_intersection == false;
- bool const c3a = metric == best_metric && snapped.getAtIntersection() == true && best_at_intersection == true;
- bool const c3b = second_metric < best_second_metric;
-
- if (c1 || c2 || c3a && c3b) {
+
+ if (best_snapped_point.isOtherSnapBetter(snapped_point, true)) {
best_transformation = result;
- best_metric = metric;
- best_second_metric = second_metric;
- best_at_intersection = snapped.getAtIntersection();
- //std::cout << "SEL ";
- } //else { std::cout << " ";}
+ best_snapped_point = snapped_point;
+ }
}
-
- //std::cout << "P_orig = " << (*i) << " | metric = " << metric << " | distance = " << snapped.getDistance() << " | second metric = " << second_metric << " | P_snap = " << snapped.getPoint() << std::endl;
+
j++;
}
-
+
+ Geom::Coord best_metric;
+ if (transformation_type == SCALE) {
+ // When scaling, don't ever exit with one of scaling components set to NR_HUGE
+ for (int index = 0; index < 2; index++) {
+ if (best_transformation[index] == NR_HUGE) {
+ if (uniform && best_transformation[1-index] < NR_HUGE) {
+ best_transformation[index] = best_transformation[1-index];
+ } else {
+ best_transformation[index] = transformation[index];
+ }
+ }
+ }
+ }
+
+ best_metric = best_snapped_point.getSnapDistance();
+ best_snapped_point.setTransformation(best_transformation);
// Using " < 1e6" instead of " < NR_HUGE" for catching some rounding errors
// These rounding errors might be caused by NRRects, see bug #1584301
- return std::make_pair(best_transformation, best_metric < 1e6);
+ best_snapped_point.setSnapDistance(best_metric < 1e6 ? best_metric : NR_HUGE);
+ return best_snapped_point;
}
/**
- * Try to snap a list of points to any interested snappers after they have undergone
- * a translation.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param tr Proposed translation.
- * \return Snapped translation, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \brief Apply a translation to a set of points and try to snap freely in 2 degrees-of-freedom
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param tr Proposed translation; the final translation can only be calculated after snapping has occurred
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::Point, bool> SnapManager::freeSnapTranslation(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- NR::Point const &tr) const
+Inkscape::SnappedPoint SnapManager::freeSnapTranslate(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Geom::Point const &tr) const
{
- return _snapTransformed(
- t, p, it, false, NR::Point(), TRANSLATION, tr, NR::Point(), NR::X, false
- );
-}
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), TRANSLATE, tr, Geom::Point(0,0), Geom::X, false);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+
+ return _snapTransformed(p, pointer, false, Geom::Point(0,0), TRANSLATE, tr, Geom::Point(0,0), Geom::X, false);
+}
+
/**
- * Try to snap a list of points to any interested snappers after they have undergone a
- * translation. A snap will only occur along a line described by a
- * Inkscape::Snapper::ConstraintLine.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param c Constraint line.
- * \param tr Proposed translation.
- * \return Snapped translation, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \brief Apply a translation to a set of points and try to snap along a constraint
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param constraint The direction or line along which snapping must occur.
+ * \param tr Proposed translation; the final translation can only be calculated after snapping has occurred.
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::Point, bool> SnapManager::constrainedSnapTranslation(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- Inkscape::Snapper::ConstraintLine const &c,
- NR::Point const &tr) const
+Inkscape::SnappedPoint SnapManager::constrainedSnapTranslate(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Inkscape::Snapper::SnapConstraint const &constraint,
+ Geom::Point const &tr) const
{
- return _snapTransformed(
- t, p, it, true, c, TRANSLATION, tr, NR::Point(), NR::X, false
- );
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), TRANSLATE, tr, Geom::Point(0,0), Geom::X, false);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+
+ return _snapTransformed(p, pointer, true, constraint, TRANSLATE, tr, Geom::Point(0,0), Geom::X, false);
}
/**
- * Try to snap a list of points to any interested snappers after they have undergone
- * a scale.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param s Proposed scale.
- * \param o Origin of proposed scale.
- * \return Snapped scale, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \brief Apply a scaling to a set of points and try to snap freely in 2 degrees-of-freedom
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param s Proposed scaling; the final scaling can only be calculated after snapping has occurred
+ * \param o Origin of the scaling
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::scale, bool> SnapManager::freeSnapScale(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- NR::scale const &s,
- NR::Point const &o) const
+Inkscape::SnappedPoint SnapManager::freeSnapScale(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Geom::Scale const &s,
+ Geom::Point const &o) const
{
- return _snapTransformed(
- t, p, it, false, NR::Point(), SCALE, NR::Point(s[NR::X], s[NR::Y]), o, NR::X, false
- );
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, false);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+
+ return _snapTransformed(p, pointer, false, Geom::Point(0,0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, false);
}
/**
- * Try to snap a list of points to any interested snappers after they have undergone
- * a scale. A snap will only occur along a line described by a
- * Inkscape::Snapper::ConstraintLine.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param s Proposed scale.
- * \param o Origin of proposed scale.
- * \return Snapped scale, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \brief Apply a scaling to a set of points and snap such that the aspect ratio of the selection is preserved
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param s Proposed scaling; the final scaling can only be calculated after snapping has occurred
+ * \param o Origin of the scaling
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::scale, bool> SnapManager::constrainedSnapScale(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- Inkscape::Snapper::ConstraintLine const &c,
- NR::scale const &s,
- NR::Point const &o) const
+Inkscape::SnappedPoint SnapManager::constrainedSnapScale(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Geom::Scale const &s,
+ Geom::Point const &o) const
{
- return _snapTransformed(
- t, p, it, true, c, SCALE, NR::Point(s[NR::X], s[NR::Y]), o, NR::X, false
- );
-}
+ // When constrained scaling, only uniform scaling is supported.
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, true);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+ return _snapTransformed(p, pointer, true, Geom::Point(0,0), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, true);
+}
/**
- * Try to snap a list of points to any interested snappers after they have undergone
- * a stretch.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param s Proposed stretch.
- * \param o Origin of proposed stretch.
+ * \brief Apply a stretch to a set of points and snap such that the direction of the stretch is preserved
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param s Proposed stretch; the final stretch can only be calculated after snapping has occurred
+ * \param o Origin of the stretching
* \param d Dimension in which to apply proposed stretch.
- * \param u true if the stretch should be uniform (ie to be applied equally in both dimensions)
- * \return Snapped stretch, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \param u true if the stretch should be uniform (i.e. to be applied equally in both dimensions)
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::Coord, bool> SnapManager::freeSnapStretch(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- NR::Coord const &s,
- NR::Point const &o,
- NR::Dim2 d,
- bool u) const
+Inkscape::SnappedPoint SnapManager::constrainedSnapStretch(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Geom::Coord const &s,
+ Geom::Point const &o,
+ Geom::Dim2 d,
+ bool u) const
{
- std::pair<NR::Point, bool> const r = _snapTransformed(
- t, p, it, false, NR::Point(), STRETCH, NR::Point(s, s), o, d, u
- );
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), STRETCH, Geom::Point(s, s), o, d, u);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
- return std::make_pair(r.first[d], r.second);
+ return _snapTransformed(p, pointer, true, Geom::Point(0,0), STRETCH, Geom::Point(s, s), o, d, u);
}
-
/**
- * Try to snap a list of points to any interested snappers after they have undergone
- * a skew.
- *
- * \param t Type of points.
- * \param p Points.
- * \param it List of items to ignore when snapping.
- * \param s Proposed skew.
- * \param o Origin of proposed skew.
+ * \brief Apply a skew to a set of points and snap such that the direction of the skew is preserved
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param constraint The direction or line along which snapping must occur.
+ * \param s Proposed skew; the final skew can only be calculated after snapping has occurred
+ * \param o Origin of the proposed skew
* \param d Dimension in which to apply proposed skew.
- * \return Snapped skew, if a snap occurred, and a flag indicating whether a snap occurred.
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
*/
-std::pair<NR::Coord, bool> SnapManager::freeSnapSkew(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- std::list<SPItem const *> const &it,
- NR::Coord const &s,
- NR::Point const &o,
- NR::Dim2 d) const
+Inkscape::SnappedPoint SnapManager::constrainedSnapSkew(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Inkscape::Snapper::SnapConstraint const &constraint,
+ Geom::Point const &s,
+ Geom::Point const &o,
+ Geom::Dim2 d) const
{
- std::pair<NR::Point, bool> const r = _snapTransformed(
- t, p, it, false, NR::Point(), SKEW, NR::Point(s, s), o, d, false
- );
+ // "s" contains skew factor in s[0], and scale factor in s[1]
+
+ // Snapping the nodes of the bounding box of a selection that is being transformed, will only work if
+ // the transformation of the bounding box is equal to the transformation of the individual nodes. This is
+ // NOT the case for example when rotating or skewing. The bounding box itself cannot possibly rotate or skew,
+ // so it's corners have a different transformation. The snappers cannot handle this, therefore snapping
+ // of bounding boxes is not allowed here.
+ if (p.size() > 0) {
+ g_assert(!(p.at(0).getSourceType() & Inkscape::SNAPSOURCE_BBOX_CATEGORY));
+ }
+
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), SKEW, s, o, d, false);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+
+ return _snapTransformed(p, pointer, true, constraint, SKEW, s, o, d, false);
+}
+
+/**
+ * \brief Apply a rotation to a set of points and snap, without scaling
+ *
+ * \param p Collection of points to snap (snap sources), at their untransformed position, all points undergoing the same transformation. Paired with an identifier of the type of the snap source.
+ * \param pointer Location of the mouse pointer at the time dragging started (i.e. when the selection was still untransformed).
+ * \param angle Proposed rotation (in radians); the final rotation can only be calculated after snapping has occurred
+ * \param o Origin of the rotation
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics.
+ */
+
+Inkscape::SnappedPoint SnapManager::constrainedSnapRotate(std::vector<Inkscape::SnapCandidatePoint> const &p,
+ Geom::Point const &pointer,
+ Geom::Coord const &angle,
+ Geom::Point const &o) const
+{
+ // Snapping the nodes of the bounding box of a selection that is being transformed, will only work if
+ // the transformation of the bounding box is equal to the transformation of the individual nodes. This is
+ // NOT the case for example when rotating or skewing. The bounding box itself cannot possibly rotate or skew,
+ // so it's corners have a different transformation. The snappers cannot handle this, therefore snapping
+ // of bounding boxes is not allowed here.
+
+ if (p.size() == 1) {
+ Geom::Point pt = _transformPoint(p.at(0), ROTATE, Geom::Point(angle, angle), o, Geom::X, false);
+ _displaySnapsource(Inkscape::SnapCandidatePoint(pt, p.at(0).getSourceType()));
+ }
+
+ return _snapTransformed(p, pointer, true, Geom::Point(0,0), ROTATE, Geom::Point(angle, angle), o, Geom::X, false);
- return std::make_pair(r.first[d], r.second);
}
-Inkscape::SnappedPoint SnapManager::findBestSnap(NR::Point const &p, SnappedConstraints &sc, bool constrained) const
+/**
+ * \brief Given a set of possible snap targets, find the best target (which is not necessarily
+ * also the nearest target), and show the snap indicator if requested
+ *
+ * \param p Source point to be snapped
+ * \param sc A structure holding all snap targets that have been found so far
+ * \param constrained True if the snap is constrained, e.g. for stretching or for purely horizontal translation.
+ * \param noCurves If true, then do consider snapping to intersections of curves, but not to the curves themselves
+ * \param allowOffScreen If true, then snapping to points which are off the screen is allowed (needed for example when pasting to the grid)
+ * \return An instance of the SnappedPoint class, which holds data on the snap source, snap target, and various metrics
+ */
+
+Inkscape::SnappedPoint SnapManager::findBestSnap(Inkscape::SnapCandidatePoint const &p,
+ SnappedConstraints const &sc,
+ bool constrained,
+ bool noCurves,
+ bool allowOffScreen) const
{
- NR::Coord const guide_sens = guide.getDistance();
- NR::Coord grid_sens = 0;
-
- SnapManager::SnapperList const gs = getGridSnappers();
- SnapperList::const_iterator i = gs.begin();
- if (i != gs.end()) {
- grid_sens = (*i)->getDistance();
- }
-
- // Store all snappoints, optionally together with their specific snapping range
- std::list<std::pair<Inkscape::SnappedPoint, NR::Coord> > sp_list;
- // Most of these snapped points are already within the snapping range, because
- // they have already been filtered by their respective snappers. In that case
- // we can set the snapping range to NR_HUGE here. If however we're looking at
- // intersections of e.g. a grid and guide line, then we'll have to determine
- // once again whether we're within snapping range. In this case we will set
- // the snapping range to e.g. min(guide_sens, grid_sens)
-
+
+
+ /*
+ std::cout << "Type and number of snapped constraints: " << std::endl;
+ std::cout << " Points : " << sc.points.size() << std::endl;
+ std::cout << " Lines : " << sc.lines.size() << std::endl;
+ std::cout << " Grid lines : " << sc.grid_lines.size()<< std::endl;
+ std::cout << " Guide lines : " << sc.guide_lines.size()<< std::endl;
+ std::cout << " Curves : " << sc.curves.size()<< std::endl;
+ */
+
+ // Store all snappoints
+ std::list<Inkscape::SnappedPoint> sp_list;
+
// search for the closest snapped point
Inkscape::SnappedPoint closestPoint;
if (getClosestSP(sc.points, closestPoint)) {
- sp_list.push_back(std::make_pair(closestPoint, NR_HUGE));
- }
-
- // search for the closest snapped line segment
- Inkscape::SnappedLineSegment closestLineSegment;
- if (getClosestSLS(sc.lines, closestLineSegment)) {
- sp_list.push_back(std::make_pair(Inkscape::SnappedPoint(closestLineSegment), NR_HUGE));
- }
-
- if (_intersectionLS) {
- // search for the closest snapped intersection of line segments
- Inkscape::SnappedPoint closestLineSegmentIntersection;
- if (getClosestIntersectionSLS(sc.lines, closestLineSegmentIntersection)) {
- sp_list.push_back(std::make_pair(closestLineSegmentIntersection, NR_HUGE));
- }
- }
+ sp_list.push_back(closestPoint);
+ }
+
+ // search for the closest snapped curve
+ if (!noCurves) {
+ Inkscape::SnappedCurve closestCurve;
+ if (getClosestCurve(sc.curves, closestCurve)) {
+ sp_list.push_back(Inkscape::SnappedPoint(closestCurve));
+ }
+ }
+
+ if (snapprefs.getSnapIntersectionCS()) {
+ // search for the closest snapped intersection of curves
+ Inkscape::SnappedPoint closestCurvesIntersection;
+ if (getClosestIntersectionCS(sc.curves, p.getPoint(), closestCurvesIntersection, _desktop->dt2doc())) {
+ closestCurvesIntersection.setSource(p.getSourceType());
+ sp_list.push_back(closestCurvesIntersection);
+ }
+ }
// search for the closest snapped grid line
Inkscape::SnappedLine closestGridLine;
- if (getClosestSL(sc.grid_lines, closestGridLine)) {
- sp_list.push_back(std::make_pair(Inkscape::SnappedPoint(closestGridLine), NR_HUGE));
+ if (getClosestSL(sc.grid_lines, closestGridLine)) {
+ sp_list.push_back(Inkscape::SnappedPoint(closestGridLine));
}
-
+
// search for the closest snapped guide line
Inkscape::SnappedLine closestGuideLine;
if (getClosestSL(sc.guide_lines, closestGuideLine)) {
- sp_list.push_back(std::make_pair(Inkscape::SnappedPoint(closestGuideLine), NR_HUGE));
+ sp_list.push_back(Inkscape::SnappedPoint(closestGuideLine));
}
-
+
// When freely snapping to a grid/guide/path, only one degree of freedom is eliminated
- // Therefore we will try get fully constrained by finding an intersection with another grid/guide/path
-
+ // Therefore we will try get fully constrained by finding an intersection with another grid/guide/path
+
// When doing a constrained snap however, we're already at an intersection of the constrained line and
// the grid/guide/path we're snapping to. This snappoint is therefore fully constrained, so there's
// no need to look for additional intersections
@@ -693,44 +1084,213 @@ Inkscape::SnappedPoint SnapManager::findBestSnap(NR::Point const &p, SnappedCons
// search for the closest snapped intersection of grid lines
Inkscape::SnappedPoint closestGridPoint;
if (getClosestIntersectionSL(sc.grid_lines, closestGridPoint)) {
- sp_list.push_back(std::make_pair(closestGridPoint, NR_HUGE));
+ closestGridPoint.setSource(p.getSourceType());
+ closestGridPoint.setTarget(Inkscape::SNAPTARGET_GRID_INTERSECTION);
+ sp_list.push_back(closestGridPoint);
}
-
+
// search for the closest snapped intersection of guide lines
Inkscape::SnappedPoint closestGuidePoint;
if (getClosestIntersectionSL(sc.guide_lines, closestGuidePoint)) {
- sp_list.push_back(std::make_pair(closestGuidePoint, NR_HUGE));
+ closestGuidePoint.setSource(p.getSourceType());
+ closestGuidePoint.setTarget(Inkscape::SNAPTARGET_GUIDE_INTERSECTION);
+ sp_list.push_back(closestGuidePoint);
}
-
+
// search for the closest snapped intersection of grid with guide lines
- if (_intersectionGG) {
- Inkscape::SnappedPoint closestGridGuidePoint;
- if (getClosestIntersectionSL(sc.grid_lines, sc.guide_lines, closestGridGuidePoint)) {
- sp_list.push_back(std::make_pair(closestGridGuidePoint, std::min(guide_sens, grid_sens)));
- }
+ if (snapprefs.getSnapIntersectionGG()) {
+ Inkscape::SnappedPoint closestGridGuidePoint;
+ if (getClosestIntersectionSL(sc.grid_lines, sc.guide_lines, closestGridGuidePoint)) {
+ closestGridGuidePoint.setSource(p.getSourceType());
+ closestGridGuidePoint.setTarget(Inkscape::SNAPTARGET_GRID_GUIDE_INTERSECTION);
+ sp_list.push_back(closestGridGuidePoint);
+ }
}
}
-
+
// now let's see which snapped point gets a thumbs up
- Inkscape::SnappedPoint bestPoint(p, NR_HUGE);
- for (std::list<std::pair<Inkscape::SnappedPoint, NR::Coord> >::const_iterator i = sp_list.begin(); i != sp_list.end(); i++) {
- // first find out if this snapped point is within snapping range
- if ((*i).first.getDistance() <= (*i).second) {
- // if it's the first point
- bool c1 = (i == sp_list.begin());
- // or, if it's closer
- bool c2 = (*i).first.getDistance() < bestPoint.getDistance();
- // or, if it's just as close then consider the second distance
- // (which is only relevant for points at an intersection)
- bool c3a = ((*i).first.getDistance() == bestPoint.getDistance());
- bool c3b = (*i).first.getSecondDistance() < bestPoint.getSecondDistance();
- // then prefer this point over the previous one
- if (c1 || c2 || c3a && c3b) {
- bestPoint = (*i).first;
+ Inkscape::SnappedPoint bestSnappedPoint(p.getPoint());
+ // std::cout << "Finding the best snap..." << std::endl;
+ for (std::list<Inkscape::SnappedPoint>::const_iterator i = sp_list.begin(); i != sp_list.end(); i++) {
+ // std::cout << "sp = " << (*i).getPoint() << " | source = " << (*i).getSource() << " | target = " << (*i).getTarget();
+ bool onScreen = _desktop->get_display_area().contains((*i).getPoint());
+ if (onScreen || allowOffScreen) { // Only snap to points which are not off the screen
+ if ((*i).getSnapDistance() <= (*i).getTolerance()) { // Only snap to points within snapping range
+ // if it's the first point, or if it is closer than the best snapped point so far
+ if (i == sp_list.begin() || bestSnappedPoint.isOtherSnapBetter(*i, false)) {
+ // then prefer this point over the previous one
+ bestSnappedPoint = *i;
+ }
+ }
+ }
+ // std::cout << std::endl;
+ }
+
+ // Update the snap indicator, if requested
+ if (_snapindicator) {
+ if (bestSnappedPoint.getSnapped()) {
+ _desktop->snapindicator->set_new_snaptarget(bestSnappedPoint);
+ } else {
+ _desktop->snapindicator->remove_snaptarget();
+ }
+ }
+
+ // std::cout << "findBestSnap = " << bestSnappedPoint.getPoint() << " | dist = " << bestSnappedPoint.getSnapDistance() << std::endl;
+ return bestSnappedPoint;
+}
+
+/// Convenience shortcut when there is only one item to ignore
+void SnapManager::setup(SPDesktop const *desktop,
+ bool snapindicator,
+ SPItem const *item_to_ignore,
+ std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes,
+ SPGuide *guide_to_ignore)
+{
+ g_assert(desktop != NULL);
+ _items_to_ignore.clear();
+ _items_to_ignore.push_back(item_to_ignore);
+ _desktop = desktop;
+ _snapindicator = snapindicator;
+ _unselected_nodes = unselected_nodes;
+ _guide_to_ignore = guide_to_ignore;
+ _rotation_center_source_item = NULL;
+}
+
+/**
+ * \brief Prepare the snap manager for the actual snapping, which includes building a list of snap targets
+ * to ignore and toggling the snap indicator
+ *
+ * There are two overloaded setup() methods, of which the other one only allows for a single item to be ignored
+ * whereas this one will take a list of items to ignore
+ *
+ * \param desktop Reference to the desktop to which this snap manager is attached
+ * \param snapindicator If true then a snap indicator will be displayed automatically (when enabled in the preferences)
+ * \param items_to_ignore These items will not be snapped to, e.g. the items that are currently being dragged. This avoids "self-snapping"
+ * \param unselected_nodes Stationary nodes of the path that is currently being edited in the node tool and
+ * that can be snapped too. Nodes not in this list will not be snapped to, to avoid "self-snapping". Of each
+ * unselected node both the position (Geom::Point) and the type (Inkscape::SnapTargetType) will be stored
+ * \param guide_to_ignore Guide that is currently being dragged and should not be snapped to
+ */
+
+void SnapManager::setup(SPDesktop const *desktop,
+ bool snapindicator,
+ std::vector<SPItem const *> &items_to_ignore,
+ std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes,
+ SPGuide *guide_to_ignore)
+{
+ g_assert(desktop != NULL);
+ _items_to_ignore = items_to_ignore;
+ _desktop = desktop;
+ _snapindicator = snapindicator;
+ _unselected_nodes = unselected_nodes;
+ _guide_to_ignore = guide_to_ignore;
+ _rotation_center_source_item = NULL;
+}
+
+/// Setup, taking the list of items to ignore from the desktop's selection.
+void SnapManager::setupIgnoreSelection(SPDesktop const *desktop,
+ bool snapindicator,
+ std::vector<Inkscape::SnapCandidatePoint> *unselected_nodes,
+ SPGuide *guide_to_ignore)
+{
+ _desktop = desktop;
+ _snapindicator = snapindicator;
+ _unselected_nodes = unselected_nodes;
+ _guide_to_ignore = guide_to_ignore;
+ _rotation_center_source_item = NULL;
+ _items_to_ignore.clear();
+
+ Inkscape::Selection *sel = _desktop->selection;
+ GSList const *items = sel->itemList();
+ for (GSList *i = const_cast<GSList*>(items); i; i = i->next) {
+ _items_to_ignore.push_back(static_cast<SPItem const *>(i->data));
+ }
+}
+
+SPDocument *SnapManager::getDocument() const
+{
+ return _named_view->document;
+}
+
+/**
+ * \brief Takes an untransformed point, applies the given transformation, and returns the transformed point. Eliminates lots of duplicated code
+ *
+ * \param p The untransformed position of the point, paired with an identifier of the type of the snap source.
+ * \param transformation_type Type of transformation to apply.
+ * \param transformation Mathematical description of the transformation; details depend on the type.
+ * \param origin Origin of the transformation, if applicable.
+ * \param dim Dimension to which the transformation applies, if applicable.
+ * \param uniform true if the transformation should be uniform; only applicable for stretching and scaling.
+ * \return The position of the point after transformation
+ */
+
+Geom::Point SnapManager::_transformPoint(Inkscape::SnapCandidatePoint const &p,
+ Transformation const transformation_type,
+ Geom::Point const &transformation,
+ Geom::Point const &origin,
+ Geom::Dim2 const dim,
+ bool const uniform) const
+{
+ /* Work out the transformed version of this point */
+ Geom::Point transformed;
+ switch (transformation_type) {
+ case TRANSLATE:
+ transformed = p.getPoint() + transformation;
+ break;
+ case SCALE:
+ transformed = (p.getPoint() - origin) * Geom::Scale(transformation[Geom::X], transformation[Geom::Y]) + origin;
+ break;
+ case STRETCH:
+ {
+ Geom::Scale s(1, 1);
+ if (uniform)
+ s[Geom::X] = s[Geom::Y] = transformation[dim];
+ else {
+ s[dim] = transformation[dim];
+ s[1 - dim] = 1;
}
+ transformed = ((p.getPoint() - origin) * s) + origin;
+ break;
+ }
+ case SKEW:
+ // Apply the skew factor
+ transformed[dim] = (p.getPoint())[dim] + transformation[0] * ((p.getPoint())[1 - dim] - origin[1 - dim]);
+ // While skewing, mirroring and scaling (by integer multiples) in the opposite direction is also allowed.
+ // Apply that scale factor here
+ transformed[1-dim] = (p.getPoint() - origin)[1 - dim] * transformation[1] + origin[1 - dim];
+ break;
+ case ROTATE:
+ // for rotations: transformation[0] stores the angle in radians
+ transformed = (p.getPoint() - origin) * Geom::Rotate(transformation[0]) + origin;
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ return transformed;
+}
+
+/**
+ * \brief Mark the location of the snap source (not the snap target!) on the canvas by drawing a symbol
+ *
+ * \param point_type Category of points to which the source point belongs: node, guide or bounding box
+ * \param p The transformed position of the source point, paired with an identifier of the type of the snap source.
+ */
+
+void SnapManager::_displaySnapsource(Inkscape::SnapCandidatePoint const &p) const {
+
+ Inkscape::Preferences *prefs = Inkscape::Preferences::get();
+ if (prefs->getBool("/options/snapclosestonly/value")) {
+ bool p_is_a_node = p.getSourceType() & Inkscape::SNAPSOURCE_NODE_CATEGORY;
+ bool p_is_a_bbox = p.getSourceType() & Inkscape::SNAPSOURCE_BBOX_CATEGORY;
+ bool p_is_other = p.getSourceType() & Inkscape::SNAPSOURCE_OTHER_CATEGORY;
+
+ if (snapprefs.getSnapEnabledGlobally() && (p_is_other || (p_is_a_node && snapprefs.getSnapModeNode()) || (p_is_a_bbox && snapprefs.getSnapModeBBox()))) {
+ _desktop->snapindicator->set_new_snapsource(p);
+ } else {
+ _desktop->snapindicator->remove_snapsource();
}
}
- return bestPoint;
}
/*