#ifndef SEEN_SNAP_H

#define SEEN_SNAP_H

#include <vector>

#include <libnr/nr-coord.h>

#include <libnr/nr-dim2.h>

#include <libnr/nr-forward.h>

#include <libnr/nr-scale.h>

#include "guide-snapper.h"

#include "object-snapper.h"

class SPNamedView;

class SnapManager

{

public:

SnapManager(SPNamedView const *v);

typedef std::list<const Inkscape::Snapper*> SnapperList;

bool SomeSnapperMightSnap() const;

Inkscape::SnappedPoint freeSnap(Inkscape::Snapper::PointType t,

NR::Point const &p,

SPItem const *it) const;

Inkscape::SnappedPoint 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 constrainedSnap(Inkscape::Snapper::PointType t,

NR::Point const &p,

Inkscape::Snapper::ConstraintLine const &c,

SPItem const *it) const;

Inkscape::SnappedPoint 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;

Inkscape::SnappedPoint guideSnap(NR::Point const &p,

NR::Point const &guide_normal) const;

std::pair<NR::Point, bool> freeSnapTranslation(Inkscape::Snapper::PointType t,

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

std::list<SPItem const *> const &it,

NR::Point const &tr) const;

std::pair<NR::Point, bool> 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;

std::pair<NR::scale, bool> 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;

std::pair<NR::scale, bool> 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;

std::pair<NR::Coord, bool> 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 uniform) const;

std::pair<NR::Coord, bool> 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 guideSnap(NR::Point const &p,

Inkscape::ObjectSnapper::DimensionToSnap const snap_dim) const;

Inkscape::GuideSnapper guide; ///< guide snapper

Inkscape::ObjectSnapper object; ///< snapper to other objects

SnapperList getSnappers() const;

SnapperList getGridSnappers() const;

void setSnapModeBBox(bool enabled);

void setSnapModeNode(bool enabled);

void setSnapModeGuide(bool enabled);

bool getSnapModeBBox() const;

bool getSnapModeNode() const;

bool getSnapModeGuide() const;

void setSnapIntersectionGG(bool enabled) {_intersectionGG = enabled;}

void setSnapIntersectionLS(bool enabled) {_intersectionLS = enabled;}

bool getSnapIntersectionGG() { return _intersectionGG;}

bool getSnapIntersectionLS() { return _intersectionLS;}

void setIncludeItemCenter(bool enabled) {

_include_item_center = enabled;

// also store a local copy in the object-snapper instead of passing it through many functions

object.setIncludeItemCenter(enabled);

}

bool getIncludeItemCenter() const {

return _include_item_center;

}

protected:

SPNamedView const *_named_view;

private:

enum Transformation {

TRANSLATION,

SCALE,

STRETCH,

SKEW

};

bool _include_item_center; //If true, snapping nodes will also snap the item's center

bool _intersectionGG;

bool _intersectionLS;

std::pair<NR::Point, bool> _snapTransformed(Inkscape::Snapper::PointType type,

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

std::list<SPItem const *> const &ignore,

bool constrained,

Inkscape::Snapper::ConstraintLine const &constraint,

Transformation transformation_type,

NR::Point const &transformation,

NR::Point const &origin,

NR::Dim2 dim,

bool uniform) const;

Inkscape::SnappedPoint findBestSnap(NR::Point const &p, SnappedConstraints &sc) const;

};

#endif /* !SEEN_SNAP_H */