![[tokkee]](http://tokkee.org/images/avatar.png){kind=avatar}
diff --git a/src/snap.cpp b/src/snap.cpp
index 592c65fec3280b94708a70864d11ac28df4cb91b..68f4c8465acb1c6592909a9e707d9c19c67734cf 100644 (file)
--- a/src/snap.cpp
+++ b/src/snap.cpp
/**
* \file snap.cpp
- *
- * \brief Various snapping methods
+ * \brief SnapManager class.
*
* Authors:
* Lauris Kaplinski <lauris@kaplinski.com>
* Frank Felfe <innerspace@iname.com>
+ * Nathan Hurst <njh@njhurst.com>
* Carl Hetherington <inkscape@carlh.net>
+ * Diederik van Lierop <mail@diedenrezi.nl>
*
- * Copyright (C) 1999-2002 Authors
+ * Copyright (C) 2006-2007 Johan Engelen <johan@shouraizou.nl>
+ * Copyrigth (C) 2004 Nathan Hurst
+ * Copyright (C) 1999-2008 Authors
*
* Released under GNU GPL, read the file 'COPYING' for more information
*/
+#include <utility>
+
#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>
-SnapManager::SnapperList SnapManager::getSnappers() const
+#include "display/canvas-grid.h"
+#include "display/snap-indicator.h"
+
+#include "inkscape.h"
+#include "desktop.h"
+#include "sp-guide.h"
+using std::vector;
+
+/**
+ * Construct a SnapManager for a SPNamedView.
+ *
+ * \param v `Owning' SPNamedView.
+ */
+
+SnapManager::SnapManager(SPNamedView const *v) :
+ guide(v, 0),
+ object(v, 0),
+ _named_view(v),
+ _include_item_center(false),
+ _snap_enabled_globally(true)
+{
+}
+
+
+/**
+ * \return List of snappers that we use.
+ */
+SnapManager::SnapperList
+SnapManager::getSnappers() const
{
SnapManager::SnapperList s;
- s.push_back(&grid);
s.push_back(&guide);
s.push_back(&object);
+
+ SnapManager::SnapperList gs = getGridSnappers();
+ s.splice(s.begin(), gs);
+
+ return s;
+}
+
+/**
+ * \return List of gridsnappers that we use.
+ */
+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()) {
+ 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 s;
}
/**
* \return true if one of the snappers will try to snap something.
*/
-bool SnapManager::willSnapSomething() const
+
+bool SnapManager::SomeSnapperMightSnap() const
{
+ if (!_snap_enabled_globally) {
+ return false;
+ }
+
SnapperList const s = getSnappers();
SnapperList::const_iterator i = s.begin();
- while (i != s.end() && (*i)->willSnapSomething() == false) {
+ 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().
+ *
+ * */
-/* FIXME: lots of cut-and-paste here. This needs some
-** functor voodoo to cut it all down a bit.
-*/
-
-Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- SPItem const *it) const
+void SnapManager::setSnapModeBBox(bool enabled)
{
- std::list<SPItem const *> lit;
- lit.push_back(it);
- return freeSnap(t, p, lit);
+ //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
}
-
-Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- std::list<SPItem const *> const &it) const
+bool SnapManager::getSnapModeBBox() const
{
- Inkscape::SnappedPoint r(p, NR_HUGE);
+ return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX);
+}
- SnapperList const snappers = getSnappers();
- for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
- Inkscape::SnappedPoint const s = (*i)->freeSnap(t, p, it);
- if (s.getDistance() < r.getDistance()) {
- r = s;
- }
+void SnapManager::setSnapModeNode(bool enabled)
+{
+ 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);
+}
- return r;
+bool SnapManager::getSnapModeNode() const
+{
+ return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE);
}
+void SnapManager::setSnapModeGuide(bool enabled)
+{
+ object.setSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE, enabled);
+}
-Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- NR::Point const &c,
- SPItem const *it) const
+bool SnapManager::getSnapModeGuide() const
{
- std::list<SPItem const *> lit;
- lit.push_back(it);
- return constrainedSnap(t, p, c, lit);
+ return object.getSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE);
}
+/**
+ * Try to snap a point to any of the specified snappers.
+ *
+ * \param point_type 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 snappers List of snappers to try to snap to
+ * \return Snapped point.
+ */
-Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::Snapper::PointType t,
- NR::Point const &p,
- NR::Point const &c,
- std::list<SPItem const *> const &it) const
+void SnapManager::freeSnapReturnByRef(Inkscape::Snapper::PointType point_type,
+ NR::Point &p,
+ bool first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap) const
{
- Inkscape::SnappedPoint r(p, NR_HUGE);
+ Inkscape::SnappedPoint const s = freeSnap(point_type, p, first_point, bbox_to_snap);
+ s.getPoint(p);
+}
+/**
+ * Try to snap a point to any of the specified snappers.
+ *
+ * \param point_type 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 snappers List of snappers to try to snap to
+ * \return Snapped point.
+ */
+
+Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType point_type,
+ NR::Point const &p,
+ bool first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap) const
+{
+ if (!SomeSnapperMightSnap()) {
+ return Inkscape::SnappedPoint(p, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false);
+ }
+
+ std::vector<SPItem const *> *items_to_ignore;
+ if (_item_to_ignore) { // If we have only a single item to ignore
+ // then build a list containing this single item;
+ // This single-item list will prevail over any other _items_to_ignore list, should that exist
+ items_to_ignore = new std::vector<SPItem const *>;
+ items_to_ignore->push_back(_item_to_ignore);
+ } else {
+ items_to_ignore = _items_to_ignore;
+ }
+
+ SnappedConstraints sc;
SnapperList const snappers = getSnappers();
+
for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
- Inkscape::SnappedPoint const s = (*i)->constrainedSnap(t, p, c, it);
- if (s.getDistance() < r.getDistance()) {
- r = s;
- }
+ (*i)->freeSnap(sc, point_type, p, first_point, bbox_to_snap, items_to_ignore, _unselected_nodes);
+ }
+
+ if (_item_to_ignore) {
+ delete items_to_ignore;
}
+
+ return findBestSnap(p, sc, false);
+}
+
+/**
+ * Try to snap a point to any interested snappers. A snap will only occur along
+ * a line described by a Inkscape::Snapper::ConstraintLine.
+ *
+ * \param point_type 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 constraint Constraint line.
+ * \return Snapped point.
+ */
- return r;
+void SnapManager::constrainedSnapReturnByRef(Inkscape::Snapper::PointType point_type,
+ NR::Point &p,
+ Inkscape::Snapper::ConstraintLine const &constraint,
+ bool first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap) const
+{
+ Inkscape::SnappedPoint const s = constrainedSnap(point_type, p, constraint, first_point, bbox_to_snap);
+ s.getPoint(p);
}
+/**
+ * Try to snap a point to any interested snappers. A snap will only occur along
+ * a line described by a Inkscape::Snapper::ConstraintLine.
+ *
+ * \param point_type 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 constraint Constraint line.
+ * \return Snapped point.
+ */
-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::constrainedSnap(Inkscape::Snapper::PointType point_type,
+ NR::Point const &p,
+ Inkscape::Snapper::ConstraintLine const &constraint,
+ bool first_point,
+ boost::optional<NR::Rect> const &bbox_to_snap) const
{
- if (willSnapSomething() == false) {
- return std::make_pair(tr, false);
+ if (!SomeSnapperMightSnap()) {
+ return Inkscape::SnappedPoint(p, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false);
}
-
- NR::Point best_translation = tr;
- NR::Coord best_distance = NR_HUGE;
-
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- /* Translated version of this point */
- NR::Point const q = *i + tr;
- /* Snap it */
- Inkscape::SnappedPoint s = freeSnap(t, q, it);
- if (s.getDistance() < NR_HUGE) {
- /* Resulting translation */
- NR::Point const r = s.getPoint() - *i;
- NR::Coord const d = NR::L2(r);
- if (d < best_distance) {
- best_distance = d;
- best_translation = r;
- }
- }
+
+ std::vector<SPItem const *> *items_to_ignore;
+ if (_item_to_ignore) { // If we have only a single item to ignore
+ // then build a list containing this single item;
+ // This single-item list will prevail over any other _items_to_ignore list, should that exist
+ items_to_ignore = new std::vector<SPItem const *>;
+ items_to_ignore->push_back(_item_to_ignore);
+ } else {
+ items_to_ignore = _items_to_ignore;
+ }
+
+ SnappedConstraints sc;
+ SnapperList const snappers = getSnappers();
+ for (SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
+ (*i)->constrainedSnap(sc, point_type, p, first_point, bbox_to_snap, constraint, items_to_ignore);
+ }
+
+ if (_item_to_ignore) {
+ delete items_to_ignore;
}
+
+ return findBestSnap(p, sc, true);
+}
- return std::make_pair(best_translation, best_distance < NR_HUGE);
+void SnapManager::guideSnap(NR::Point &p, NR::Point const &guide_normal) const
+{
+ // This method is used to snap a guide to nodes, while dragging the guide around
+
+ if (!(object.GuidesMightSnap() && _snap_enabled_globally)) {
+ return;
+ }
+
+ SnappedConstraints sc;
+ object.guideSnap(sc, p, guide_normal);
+
+ Inkscape::SnappedPoint const s = findBestSnap(p, 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 constrained true if the snap is constrained.
+ * \param constraint Constraint line to use, 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; only applicable for stretching and scaling.
+ */
-std::pair<NR::Point, bool> SnapManager::constrainedSnapTranslation(Inkscape::Snapper::PointType t,
- std::vector<NR::Point> const &p,
- NR::Point const &c,
- std::list<SPItem const *> const &it,
- NR::Point const &tr) const
+Inkscape::SnappedPoint SnapManager::_snapTransformed(
+ Inkscape::Snapper::PointType type,
+ std::vector<NR::Point> const &points,
+ bool constrained,
+ Inkscape::Snapper::ConstraintLine const &constraint,
+ Transformation transformation_type,
+ NR::Point const &transformation,
+ NR::Point const &origin,
+ NR::Dim2 dim,
+ bool uniform) const
{
- if (willSnapSomething() == false) {
- return std::make_pair(tr, false);
+ /* We have a list of points, which we are proposing to transform in some way. We need to see
+ ** if any of these points, when transformed, snap to anything. If they do, we return the
+ ** appropriate transformation with `true'; otherwise we return the original scale with `false'.
+ */
+
+ /* Quick check to see if we have any snappers that are enabled
+ ** Also used to globally disable all snapping
+ */
+ if (SomeSnapperMightSnap() == false) {
+ g_assert(points.size() > 0);
+ return Inkscape::SnappedPoint();
}
+
+ std::vector<NR::Point> transformed_points;
+ NR::Rect bbox;
+
+ for (std::vector<NR::Point>::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:
+ // Apply the skew factor
+ transformed[dim] = (*i)[dim] + transformation[0] * ((*i)[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] = (*i - origin)[1 - dim] * transformation[1] + origin[1 - dim];
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ // add the current transformed point to the box hulling all transformed points
+ if (i == points.begin()) {
+ bbox = NR::Rect(transformed, transformed);
+ } else {
+ bbox.expandTo(transformed);
+ }
+
+ transformed_points.push_back(transformed);
+ }
+
+ /* The current best transformation */
+ NR::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;
+ NR::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);
+
+ std::vector<NR::Point>::const_iterator j = transformed_points.begin();
+
+ // std::cout << std::endl;
+ for (std::vector<NR::Point>::const_iterator i = points.begin(); i != points.end(); i++) {
+
+ /* Snap it */
+ Inkscape::SnappedPoint snapped_point;
+
+ if (constrained) {
+ Inkscape::Snapper::ConstraintLine dedicated_constraint = constraint;
+ 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::ConstraintLine(origin, (*i) - origin);
+ } else if (transformation_type == STRETCH) { // when non-uniform stretching {
+ dedicated_constraint = Inkscape::Snapper::ConstraintLine((*i), component_vectors[dim]);
+ } else if (transformation_type == TRANSLATION) {
+ // 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 set the point through
+ // which the constraint-line runs here, for each point individually.
+ dedicated_constraint.setPoint(*i);
+ } // else: leave the original constraint, e.g. for skewing
+ if (transformation_type == SCALE && !uniform) {
+ g_warning("Non-uniform constrained scaling is not supported!");
+ }
+ snapped_point = constrainedSnap(type, *j, dedicated_constraint, i == points.begin(), bbox);
+ } else {
+ snapped_point = freeSnap(type, *j, i == points.begin(), bbox);
+ }
- NR::Point best_translation = tr;
- NR::Coord best_distance = NR_HUGE;
-
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- /* Translated version of this point */
- NR::Point const q = *i + tr;
- /* Snap it */
- Inkscape::SnappedPoint s = constrainedSnap(t, q, c, it);
- if (s.getDistance() < NR_HUGE) {
- /* Resulting translation */
- NR::Point const r = s.getPoint() - *i;
- NR::Coord const d = NR::L2(r);
- if (d < best_distance) {
- best_distance = d;
- best_translation = r;
+ NR::Point result;
+ NR::Coord metric = NR_HUGE;
+ NR::Coord second_metric = NR_HUGE;
+ NR::Point scale_metric(NR_HUGE, NR_HUGE);
+
+ 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.
+ */
+ NR::Point const a = (snapped_point.getPoint() - origin); // vector to snapped point
+ NR::Point const b = (*i - origin); // vector to original point
+
+ switch (transformation_type) {
+ case TRANSLATION:
+ result = snapped_point.getPoint() - *i;
+ /* 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
+ * 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!
+ */
+ metric = snapped_point.getDistance(); //used to be: metric = NR::L2(result);
+ second_metric = snapped_point.getSecondDistance();
+ break;
+ case SCALE:
+ {
+ result = NR::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 ofcourse)
+ 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
+ }
+ }
+ // Compare the resulting scaling with the desired scaling
+ scale_metric = result - transformation; // One or both of its components might be NR_HUGE
+ break;
+ }
+ case STRETCH:
+ result = NR::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]);
+ break;
+ case SKEW:
+ result[0] = (snapped_point.getPoint()[dim] - (*i)[dim]) / ((*i)[1 - dim] - origin[1 - dim]); // skew factor
+ result[1] = transformation[1]; // scale factor
+ metric = std::abs(result[0] - transformation[0]);
+ break;
+ default:
+ g_assert_not_reached();
+ }
+
+ /* Note it if it's the best so far */
+ if (transformation_type == SCALE) {
+ for (int index = 0; index < 2; index++) {
+ if (fabs(scale_metric[index]) < fabs(best_scale_metric[index])) {
+ best_transformation[index] = result[index];
+ best_scale_metric[index] = fabs(scale_metric[index]);
+ // When scaling, we're considering the best transformation in each direction separately
+ // Therefore two different snapped points might together make a single best transformation
+ // We will however return only a single snapped point (e.g. to display the snapping indicator)
+ best_snapped_point = snapped_point;
+ // std::cout << "SEL ";
+ } // else { std::cout << " ";}
+ }
+ if (uniform) {
+ if (best_scale_metric[0] < best_scale_metric[1]) {
+ best_transformation[1] = best_transformation[0];
+ best_scale_metric[1] = best_scale_metric[0];
+ } else {
+ best_transformation[0] = best_transformation[1];
+ best_scale_metric[0] = best_scale_metric[1];
+ }
+ }
+ best_metric = std::min(best_scale_metric[0], best_scale_metric[1]);
+ // std::cout << "P_orig = " << (*i) << " | scale_metric = " << scale_metric << " | distance = " << snapped_point.getDistance() << " | P_snap = " << snapped_point.getPoint() << std::endl;
+ } else {
+ bool const c1 = metric < best_metric;
+ bool const c2 = metric == best_metric && snapped_point.getAtIntersection() == true && best_snapped_point.getAtIntersection() == false;
+ bool const c3a = metric == best_metric && snapped_point.getAtIntersection() == true && best_snapped_point.getAtIntersection() == true;
+ bool const c3b = second_metric < best_second_metric;
+ bool const c4 = snapped_point.getAlwaysSnap() == true && best_snapped_point.getAlwaysSnap() == false;
+ bool const c4n = snapped_point.getAlwaysSnap() == false && best_snapped_point.getAlwaysSnap() == true;
+
+ if ((c1 || c2 || (c3a && c3b) || c4) && !c4n) {
+ best_transformation = result;
+ best_metric = metric;
+ best_second_metric = second_metric;
+ best_snapped_point = snapped_point;
+ // std::cout << "SEL ";
+ } // else { std::cout << " ";}
+ // std::cout << "P_orig = " << (*i) << " | metric = " << metric << " | distance = " << snapped_point.getDistance() << " | second metric = " << second_metric << " | P_snap = " << snapped_point.getPoint() << std::endl;
}
}
+
+ j++;
}
-
- return std::make_pair(best_translation, best_distance < NR_HUGE);
+
+ 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_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
+ best_snapped_point.setDistance(best_metric < 1e6 ? best_metric : NR_HUGE);
+ return best_snapped_point;
}
-
-
-
-
-/// Minimal distance to norm before point is considered for snap.
-static const double MIN_DIST_NORM = 1.0;
-
/**
- * Try to snap \a req in one dimension.
+ * Try to snap a list of points to any interested snappers after they have undergone
+ * a translation.
*
- * \param nv NamedView to use.
- * \param req Point to snap; updated to the snapped point if a snap occurred.
- * \param dim Dimension to snap in.
- * \return Distance to the snap point along the \a dim axis, or \c NR_HUGE
- * if no snap occurred.
+ * \param point_type Type of points.
+ * \param p Points.
+ * \param tr Proposed translation.
+ * \return Snapped translation, if a snap occurred, and a flag indicating whether a snap occurred.
*/
-NR::Coord namedview_dim_snap(SPNamedView const *nv, Inkscape::Snapper::PointType t, NR::Point &req,
- NR::Dim2 const dim, SPItem const *it)
-{
- return namedview_vector_snap(nv, t, req, component_vectors[dim], it);
-}
-NR::Coord namedview_dim_snap(SPNamedView const *nv, Inkscape::Snapper::PointType t, NR::Point &req,
- NR::Dim2 const dim, std::list<SPItem const *> const &it)
+Inkscape::SnappedPoint SnapManager::freeSnapTranslation(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ NR::Point const &tr) const
{
- return namedview_vector_snap(nv, t, req, component_vectors[dim], it);
+ return _snapTransformed(point_type, p, false, NR::Point(), TRANSLATION, tr, NR::Point(), NR::X, false);
}
-NR::Coord namedview_vector_snap(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- NR::Point &req, NR::Point const &d,
- SPItem const *it)
-{
- std::list<SPItem const *> lit;
- lit.push_back(it);
- return namedview_vector_snap(nv, t, req, d, lit);
-}
-
/**
- * Look for snap point along the line described by the point \a req
- * and the direction vector \a d.
- * Modifies req to the snap point, if one is found.
- * \return The distance from \a req to the snap point along the vector \a d,
- * or \c NR_HUGE if no snap point was found.
+ * 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.
*
- * \pre d \81â\89\81 (0, 0).
+ * \param point_type Type of points.
+ * \param p Points.
+ * \param constraint Constraint line.
+ * \param tr Proposed translation.
+ * \return Snapped translation, if a snap occurred, and a flag indicating whether a snap occurred.
*/
-NR::Coord namedview_vector_snap(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- NR::Point &req, NR::Point const &d,
- std::list<SPItem const *> const &it)
-{
- g_assert(nv != NULL);
- g_assert(SP_IS_NAMEDVIEW(nv));
- SnapManager::SnapperList const snappers = nv->snap_manager.getSnappers();
-
- NR::Coord best = NR_HUGE;
- for (SnapManager::SnapperList::const_iterator i = snappers.begin(); i != snappers.end(); i++) {
- Inkscape::SnappedPoint const s = (*i)->constrainedSnap(t, req, d, it);
- if (s.getDistance() < best) {
- req = s.getPoint();
- best = s.getDistance();
- }
- }
-
- return best;
+Inkscape::SnappedPoint SnapManager::constrainedSnapTranslation(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ Inkscape::Snapper::ConstraintLine const &constraint,
+ NR::Point const &tr) const
+{
+ return _snapTransformed(point_type, p, true, constraint, TRANSLATION, tr, NR::Point(), NR::X, false);
}
-/*
- * functions for lists of points
+/**
+ * Try to snap a list of points to any interested snappers after they have undergone
+ * a scale.
*
- * All functions take a list of NR::Point and parameter indicating the proposed transformation.
- * They return the updated transformation parameter.
+ * \param point_type Type of points.
+ * \param p Points.
+ * \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.
*/
-/**
- * Snap list of points in one dimension.
- * \return Coordinate difference.
- */
-std::pair<NR::Coord, bool> namedview_dim_snap_list(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- const std::vector<NR::Point> &p,
- NR::Coord const dx, NR::Dim2 const dim,
- std::list<SPItem const *> const &it
- )
+Inkscape::SnappedPoint SnapManager::freeSnapScale(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ NR::scale const &s,
+ NR::Point const &o) const
{
- NR::Coord dist = NR_HUGE;
- NR::Coord xdist = dx;
-
- SnapManager const &m = nv->snap_manager;
-
- if (m.willSnapSomething()) {
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- NR::Point q = *i;
- NR::Coord const pre = q[dim];
- q[dim] += dx;
- NR::Coord const d = namedview_dim_snap(nv, t, q, dim, it);
- if (d < dist) {
- xdist = q[dim] - pre;
- dist = d;
- }
- }
- }
-
- return std::make_pair(xdist, dist < NR_HUGE);
+ return _snapTransformed(point_type, p, false, NR::Point(), SCALE, NR::Point(s[NR::X], s[NR::Y]), o, NR::X, false);
}
+
/**
- * Snap list of points in two dimensions.
+ * 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 point_type Type of points.
+ * \param p Points.
+ * \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.
*/
-std::pair<double, bool> namedview_vector_snap_list(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- const std::vector<NR::Point> &p, NR::Point const &norm,
- NR::scale const &s, std::list<SPItem const *> const &it)
-{
- using NR::X;
- using NR::Y;
-
- SnapManager const &m = nv->snap_manager;
-
- if (m.willSnapSomething() == false) {
- return std::make_pair(s[X], false);
- }
-
- NR::Coord dist = NR_HUGE;
- double ratio = fabs(s[X]);
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- NR::Point const &q = *i;
- NR::Point check = ( q - norm ) * s + norm;
- if (NR::LInfty( q - norm ) > MIN_DIST_NORM) {
- NR::Coord d = namedview_vector_snap(nv, t, check, check - norm, it);
- if (d < dist) {
- dist = d;
- NR::Dim2 const dominant = ( ( fabs( q[X] - norm[X] ) >
- fabs( q[Y] - norm[Y] ) )
- ? X
- : Y );
- ratio = ( ( check[dominant] - norm[dominant] )
- / ( q[dominant] - norm[dominant] ) );
- }
- }
- }
- return std::make_pair(ratio, dist < NR_HUGE);
+Inkscape::SnappedPoint SnapManager::constrainedSnapScale(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ NR::scale const &s,
+ NR::Point const &o) const
+{
+ // When constrained scaling, only uniform scaling is supported.
+ return _snapTransformed(point_type, p, true, NR::Point(), SCALE, NR::Point(s[NR::X], s[NR::Y]), o, NR::X, true);
}
/**
- * Try to snap points in \a p after they have been scaled by \a sx with respect to
- * the origin \a norm. The best snap is the one that changes the scale least.
+ * Try to snap a list of points to any interested snappers after they have undergone
+ * a stretch.
*
- * \return Pair containing snapped scale and a flag which is true if a snap was made.
+ * \param point_type Type of points.
+ * \param p Points.
+ * \param s Proposed stretch.
+ * \param o Origin of proposed stretch.
+ * \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.
*/
-std::pair<double, bool> namedview_dim_snap_list_scale(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- const std::vector<NR::Point> &p, NR::Point const &norm,
- double const sx, NR::Dim2 dim,
- std::list<const SPItem *> const &it)
-{
- SnapManager const &m = nv->snap_manager;
- if (m.willSnapSomething() == false) {
- return std::make_pair(sx, false);
- }
-
- g_assert(dim < 2);
-
- NR::Coord dist = NR_HUGE;
- double scale = sx;
-
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- NR::Point q = *i;
- NR::Point check = q;
-
- /* Scaled version of the point we are looking at */
- check[dim] = (sx * (q - norm) + norm)[dim];
-
- if (fabs (q[dim] - norm[dim]) > MIN_DIST_NORM) {
- /* Snap this point */
- const NR::Coord d = namedview_dim_snap (nv, t, check, dim, it);
- /* Work out the resulting scale factor */
- double snapped_scale = (check[dim] - norm[dim]) / (q[dim] - norm[dim]);
-
- if (dist == NR_HUGE || fabs(snapped_scale - sx) < fabs(scale - sx)) {
- /* This is either the first point, or the snapped scale
- ** is the closest yet to the original.
- */
- scale = snapped_scale;
- dist = d;
- }
- }
- }
- return std::make_pair(scale, dist < NR_HUGE);
+Inkscape::SnappedPoint SnapManager::constrainedSnapStretch(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ NR::Coord const &s,
+ NR::Point const &o,
+ NR::Dim2 d,
+ bool u) const
+{
+ return _snapTransformed(point_type, p, true, NR::Point(), STRETCH, NR::Point(s, s), o, d, u);
}
+
/**
- * Try to snap points after they have been skewed.
+ * Try to snap a list of points to any interested snappers after they have undergone
+ * a skew.
+ *
+ * \param point_type Type of points.
+ * \param p Points.
+ * \param s Proposed skew.
+ * \param o Origin of 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.
*/
-double namedview_dim_snap_list_skew(SPNamedView const *nv, Inkscape::Snapper::PointType t,
- const std::vector<NR::Point> &p, NR::Point const &norm,
- double const sx, NR::Dim2 const dim)
+
+Inkscape::SnappedPoint SnapManager::constrainedSnapSkew(Inkscape::Snapper::PointType point_type,
+ std::vector<NR::Point> const &p,
+ Inkscape::Snapper::ConstraintLine const &constraint,
+ NR::Point const &s,
+ NR::Point const &o,
+ NR::Dim2 d) const
{
- SnapManager const &m = nv->snap_manager;
+ // "s" contains skew factor in s[0], and scale factor in s[1]
+ return _snapTransformed(point_type, p, true, constraint, SKEW, s, o, d, false);
+}
- if (m.willSnapSomething() == false) {
- return sx;
+Inkscape::SnappedPoint SnapManager::findBestSnap(NR::Point const &p, SnappedConstraints &sc, bool constrained) const
+{
+ /*
+ 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;
+ */
+
+ // 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(closestPoint);
+ }
+
+ // search for the closest snapped line segment
+ Inkscape::SnappedLineSegment closestLineSegment;
+ if (getClosestSLS(sc.lines, closestLineSegment)) {
+ sp_list.push_back(Inkscape::SnappedPoint(closestLineSegment));
}
-
- g_assert(dim < 2);
-
- gdouble dist = NR_HUGE;
- gdouble skew = sx;
-
- for (std::vector<NR::Point>::const_iterator i = p.begin(); i != p.end(); i++) {
- NR::Point q = *i;
- NR::Point check = q;
- // apply shear
- check[dim] += sx * (q[!dim] - norm[!dim]);
- if (fabs (q[!dim] - norm[!dim]) > MIN_DIST_NORM) {
- const gdouble d = namedview_dim_snap (nv, t, check, dim, NULL);
- if (d < fabs (dist)) {
- dist = d;
- skew = (check[dim] - q[dim]) / (q[!dim] - norm[!dim]);
+
+ if (_intersectionLS) {
+ // search for the closest snapped intersection of line segments
+ Inkscape::SnappedPoint closestLineSegmentIntersection;
+ if (getClosestIntersectionSLS(sc.lines, closestLineSegmentIntersection)) {
+ sp_list.push_back(closestLineSegmentIntersection);
+ }
+ }
+
+ // search for the closest snapped grid line
+ Inkscape::SnappedLine closestGridLine;
+ if (getClosestSL(sc.grid_lines, closestGridLine)) {
+ closestGridLine.setTarget(Inkscape::SNAPTARGET_GRID);
+ sp_list.push_back(Inkscape::SnappedPoint(closestGridLine));
+ }
+
+ // search for the closest snapped guide line
+ Inkscape::SnappedLine closestGuideLine;
+ if (getClosestSL(sc.guide_lines, closestGuideLine)) {
+ closestGuideLine.setTarget(Inkscape::SNAPTARGET_GUIDE);
+ 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
+
+ // 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
+ if (!constrained) {
+ // search for the closest snapped intersection of grid lines
+ Inkscape::SnappedPoint closestGridPoint;
+ if (getClosestIntersectionSL(sc.grid_lines, closestGridPoint)) {
+ 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)) {
+ 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)) {
+ 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 bestSnappedPoint = Inkscape::SnappedPoint(p, Inkscape::SNAPTARGET_UNDEFINED, NR_HUGE, 0, false);
+ for (std::list<Inkscape::SnappedPoint>::const_iterator i = sp_list.begin(); i != sp_list.end(); i++) {
+ // first find out if this snapped point is within snapping range
+ if ((*i).getDistance() <= (*i).getTolerance()) {
+ // if it's the first point
+ bool c1 = (i == sp_list.begin());
+ // or, if it's closer
+ bool c2 = (*i).getDistance() < bestSnappedPoint.getDistance();
+ // or, if it's for a snapper with "always snap" turned on, and the previous wasn't
+ bool c3 = (*i).getAlwaysSnap() && !bestSnappedPoint.getAlwaysSnap();
+ // But in no case fall back from a snapper with "always snap" on to one with "always snap" off
+ bool c3n = !(*i).getAlwaysSnap() && bestSnappedPoint.getAlwaysSnap();
+ // or, if it's just as close then consider the second distance
+ // (which is only relevant for points at an intersection)
+ bool c4a = ((*i).getDistance() == bestSnappedPoint.getDistance());
+ bool c4b = (*i).getSecondDistance() < bestSnappedPoint.getSecondDistance();
+ // then prefer this point over the previous one
+ if ((c1 || c2 || c3 || (c4a && c4b)) && !c3n) {
+ bestSnappedPoint = *i;
}
}
}
+
+
+ // Update the snap indicator, if requested
+ if (_desktop_for_snapindicator) {
+ if (bestSnappedPoint.getSnapped()) {
+ _desktop_for_snapindicator->snapindicator->set_new_snappoint(bestSnappedPoint);
+ } else {
+ _desktop_for_snapindicator->snapindicator->remove_snappoint();
+ }
+ }
+
+ // std::cout << "findBestSnap = " << bestSnappedPoint.getPoint() << std::endl;
+ return bestSnappedPoint;
+}
- return skew;
+void SnapManager::setup(SPDesktop const *desktop_for_snapindicator, SPItem const *item_to_ignore, std::vector<NR::Point> *unselected_nodes)
+{
+ _item_to_ignore = item_to_ignore;
+ _items_to_ignore = NULL;
+ _desktop_for_snapindicator = desktop_for_snapindicator;
+ _unselected_nodes = unselected_nodes;
}
+void SnapManager::setup(SPDesktop const *desktop_for_snapindicator, std::vector<SPItem const *> &items_to_ignore, std::vector<NR::Point> *unselected_nodes)
+{
+ _item_to_ignore = NULL;
+ _items_to_ignore = &items_to_ignore;
+ _desktop_for_snapindicator = desktop_for_snapindicator;
+ _unselected_nodes = unselected_nodes;
+}
/*
Local Variables: