#define __SP_DESKTOP_SNAP_C__

#include <utility>

#include "sp-namedview.h"

#include "snap.h"

#include "snapped-line.h"

#include "snapped-curve.h"

#include <libnr/nr-point-fns.h>

#include <libnr/nr-scale-ops.h>

#include <libnr/nr-values.h>

#include "display/canvas-grid.h"

#include "display/snap-indicator.h"

#include "inkscape.h"

#include "desktop.h"

#include "sp-guide.h"

using std::vector;

SnapManager::SnapManager(SPNamedView const *v) :

guide(this, 0),

object(this, 0),

_named_view(v),

_include_item_center(false),

_snap_enabled_globally(true)

{

}

SnapManager::SnapperList

SnapManager::getSnappers() const

{

SnapManager::SnapperList s;

s.push_back(&guide);

s.push_back(&object);

SnapManager::SnapperList gs = getGridSnappers();

s.splice(s.begin(), gs);

return s;

}

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;

}

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)->ThisSnapperMightSnap() == false) {

i++;

}

return (i != s.end());

}

void SnapManager::setSnapModeBBox(bool enabled)

{

//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

}

bool SnapManager::getSnapModeBBox() const

{

return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_BBOX);

}

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);

}

bool SnapManager::getSnapModeNode() const

{

return guide.getSnapFrom(Inkscape::Snapper::SNAPPOINT_NODE);

}

void SnapManager::setSnapModeGuide(bool enabled)

{

object.setSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE, enabled);

}

bool SnapManager::getSnapModeGuide() const

{

return object.getSnapFrom(Inkscape::Snapper::SNAPPOINT_GUIDE);

}

void SnapManager::freeSnapReturnByRef(Inkscape::Snapper::PointType point_type,

Geom::Point &p,

bool first_point,

boost::optional<Geom::Rect> const &bbox_to_snap) const

{

Inkscape::SnappedPoint const s = freeSnap(point_type, p, first_point, bbox_to_snap);

s.getPoint(p);

}

Inkscape::SnappedPoint SnapManager::freeSnap(Inkscape::Snapper::PointType point_type,

Geom::Point const &p,

bool first_point,

boost::optional<Geom::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++) {

(*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);

}

Geom::Point SnapManager::multipleOfGridPitch(Geom::Point const &t) const

{

if (!_snap_enabled_globally)

return t;

//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()) {

bool success = false;

Geom::Point nearest_multiple;

Geom::Coord nearest_distance = NR_HUGE;

// 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

// Therefor 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 = from_2geom(t) + grid->origin;

SnappedConstraints sc;

// Only the first three parameters are being used for grid snappers

snapper->freeSnap(sc, Inkscape::Snapper::SNAPPOINT_NODE, t_offset, TRUE, boost::optional<Geom::Rect>(), NULL, NULL);

// Find the best snap for this grid, including intersections of the grid-lines

Inkscape::SnappedPoint s = findBestSnap(t_offset, sc, false);

if (s.getSnapped() && (s.getDistance() < nearest_distance)) {

success = true;

nearest_multiple = s.getPoint() - to_2geom(grid->origin);

nearest_distance = s.getDistance();

}

}

}

if (success)

return nearest_multiple;

}

return t;

}

void SnapManager::constrainedSnapReturnByRef(Inkscape::Snapper::PointType point_type,

Geom::Point &p,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point,

boost::optional<Geom::Rect> const &bbox_to_snap) const

{

Inkscape::SnappedPoint const s = constrainedSnap(point_type, p, constraint, first_point, bbox_to_snap);

s.getPoint(p);

}

Inkscape::SnappedPoint SnapManager::constrainedSnap(Inkscape::Snapper::PointType point_type,

Geom::Point const &p,

Inkscape::Snapper::ConstraintLine const &constraint,

bool first_point,

boost::optional<Geom::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++) {

(*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);

}

void SnapManager::guideSnap(Geom::Point &p, Geom::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);

}

Inkscape::SnappedPoint SnapManager::_snapTransformed(

Inkscape::Snapper::PointType type,

std::vector<Geom::Point> const &points,

bool constrained,

Inkscape::Snapper::ConstraintLine const &constraint,

Transformation transformation_type,

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

if (SomeSnapperMightSnap() == false) {

g_assert(points.size() > 0);

return Inkscape::SnappedPoint();

}

std::vector<Geom::Point> transformed_points;

Geom::Rect bbox;

for (std::vector<Geom::Point>::const_iterator i = points.begin(); i != points.end(); i++) {

/* Work out the transformed version of this point */

Geom::Point transformed;

switch (transformation_type) {

case TRANSLATION:

transformed = *i + transformation;

break;

case SCALE:

transformed = (*i - 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 = ((*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 = Geom::Rect(transformed, transformed);

} else {

bbox.expandTo(transformed);

}

transformed_points.push_back(transformed);

}

/* The current best transformation */

Geom::Point best_transformation = transformation;

/* The current best metric for the best transformation; lower is better, NR_HUGE

Geom::Coord best_metric = NR_HUGE;

Geom::Coord best_second_metric = NR_HUGE;

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);

std::vector<Geom::Point>::const_iterator j = transformed_points.begin();

// std::cout << std::endl;

for (std::vector<Geom::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);

}

Geom::Point result;

Geom::Coord metric = NR_HUGE;

Geom::Coord second_metric = NR_HUGE;

Geom::Point scale_metric(NR_HUGE, NR_HUGE);

if (snapped_point.getSnapped()) {

/* We snapped. Find the transformation that describes where the snapped point has

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_point.getPoint() - *i;

/* Consider the case in which a box is almost aligned with a grid in both

metric = snapped_point.getDistance(); //used to be: metric = Geom::L2(result);

second_metric = snapped_point.getSecondDistance();

break;

case SCALE:

{

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 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 = 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]);

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++;

}

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;

}

Inkscape::SnappedPoint SnapManager::freeSnapTranslation(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Geom::Point const &tr) const

{

return _snapTransformed(point_type, p, false, Geom::Point(), TRANSLATION, tr, Geom::Point(), Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapTranslation(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &tr) const

{

return _snapTransformed(point_type, p, true, constraint, TRANSLATION, tr, Geom::Point(), Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::freeSnapScale(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Geom::Scale const &s,

Geom::Point const &o) const

{

return _snapTransformed(point_type, p, false, Geom::Point(), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, false);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapScale(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Geom::Scale const &s,

Geom::Point const &o) const

{

// When constrained scaling, only uniform scaling is supported.

return _snapTransformed(point_type, p, true, Geom::Point(), SCALE, Geom::Point(s[Geom::X], s[Geom::Y]), o, Geom::X, true);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapStretch(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Geom::Coord const &s,

Geom::Point const &o,

Geom::Dim2 d,

bool u) const

{

return _snapTransformed(point_type, p, true, Geom::Point(), STRETCH, Geom::Point(s, s), o, d, u);

}

Inkscape::SnappedPoint SnapManager::constrainedSnapSkew(Inkscape::Snapper::PointType point_type,

std::vector<Geom::Point> const &p,

Inkscape::Snapper::ConstraintLine const &constraint,

Geom::Point const &s,

Geom::Point const &o,

Geom::Dim2 d) const

{

// "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);

}

Inkscape::SnappedPoint SnapManager::findBestSnap(Geom::Point const &p, SnappedConstraints &sc, bool constrained) const

{

/*

// 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 curve

Inkscape::SnappedCurve closestCurve;

if (getClosestCurve(sc.curves, closestCurve)) {

sp_list.push_back(Inkscape::SnappedPoint(closestCurve));

}

if (_intersectionCS) {

// search for the closest snapped intersection of curves

Inkscape::SnappedPoint closestCurvesIntersection;

if (getClosestIntersectionCS(sc.curves, p, closestCurvesIntersection)) {

sp_list.push_back(closestCurvesIntersection);

}

}

// 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 (_snapindicator) {

if (bestSnappedPoint.getSnapped()) {

_desktop->snapindicator->set_new_snappoint(bestSnappedPoint);

} else {

_desktop->snapindicator->remove_snappoint();

}

}

// std::cout << "findBestSnap = " << bestSnappedPoint.getPoint() << std::endl;

return bestSnappedPoint;

}

void SnapManager::setup(SPDesktop const *desktop, bool snapindicator, SPItem const *item_to_ignore, std::vector<Geom::Point> *unselected_nodes)

{

g_assert(desktop != NULL);

_item_to_ignore = item_to_ignore;

_items_to_ignore = NULL;

_desktop = desktop;

_snapindicator = snapindicator;

_unselected_nodes = unselected_nodes;

}

void SnapManager::setup(SPDesktop const *desktop, bool snapindicator, std::vector<SPItem const *> &items_to_ignore, std::vector<Geom::Point> *unselected_nodes)

{

g_assert(desktop != NULL);

_item_to_ignore = NULL;

_items_to_ignore = &items_to_ignore;

_desktop = desktop;

_snapindicator = snapindicator;

_unselected_nodes = unselected_nodes;

}

SPDocument *SnapManager::getDocument() const

{

return _named_view->document;

}