#ifndef SEEN_VANISHING_POINT_H

#define SEEN_VANISHING_POINT_H

#include "libnr/nr-point.h"

#include "knot.h"

#include "selection.h"

#include "axis-manip.h"

#include "line-geometry.h" // TODO: Remove this include as soon as we don't need create_canvas_(point|line) any more.

class SP3DBox;

namespace Box3D {

enum VPState {

VP_FINITE = 0, // perspective lines meet in the VP

VP_INFINITE // perspective lines are parallel

};

class VanishingPoint : public NR::Point {

public:

inline VanishingPoint() : NR::Point() {};

/***

VanishingPoint(NR::Point const &pt, NR::Point const &inf_dir, VPState st);

VanishingPoint(NR::Point const &pt);

VanishingPoint(NR::Point const &dir, VPState const state);

VanishingPoint(NR::Point const &pt, NR::Point const &direction);

VanishingPoint(NR::Coord x, NR::Coord y);

VanishingPoint(NR::Coord x, NR::Coord y, VPState const state);

VanishingPoint(NR::Coord x, NR::Coord y, NR::Coord dir_x, NR::Coord dir_y);

VanishingPoint(VanishingPoint const &rhs);

~VanishingPoint();

bool operator== (VanishingPoint const &other);

inline NR::Point get_pos() const { return NR::Point ((*this)[NR::X], (*this)[NR::Y]); }

inline void set_pos(NR::Point const &pt) { (*this)[NR::X] = pt[NR::X];

(*this)[NR::Y] = pt[NR::Y]; }

inline void set_pos(const double pt_x, const double pt_y) { (*this)[NR::X] = pt_x;

(*this)[NR::Y] = pt_y; }

bool is_finite() const;

VPState toggle_parallel();

void draw(Box3D::Axis const axis); // Draws a point on the canvas if state == VP_FINITE

//inline VPState state() { return state; }

VPState state;

//NR::Point ref_pt; // point of reference to compute the direction of parallel lines

NR::Point v_dir; // direction of perslective lines if the VP has state == VP_INFINITE

private:

};

class Perspective3D;

class VPDrag;

struct VPDragger {

public:

VPDragger(VPDrag *parent, NR::Point p, VanishingPoint *vp);

~VPDragger();

VPDrag *parent;

SPKnot *knot;

// position of the knot, desktop coords

NR::Point point;

// position of the knot before it began to drag; updated when released

NR::Point point_original;

GSList *vps; // the list of vanishing points

void addVP(VanishingPoint *vp);

void removeVP(VanishingPoint *vp);

/* returns the VP of the dragger that belongs to the given perspective */

VanishingPoint *getVPofPerspective (Perspective3D *persp);

void updateTip();

bool hasBox (const SP3DBox *box);

guint numberOfBoxes(); // the number of boxes linked to all VPs of the dragger

bool hasPerspective (const Perspective3D *perps);

void mergePerspectives (); // remove duplicate perspectives

void reshapeBoxes(NR::Point const &p, Box3D::Axis axes);

void updateBoxReprs();

void updateZOrders();

};

struct VPDrag {

public:

VPDrag(SPDocument *document);

~VPDrag();

VPDragger *getDraggerFor (VanishingPoint const &vp);

//void grabKnot (VanishingPoint const &vp, gint x, gint y, guint32 etime);

bool local_change;

SPDocument *document;

GList *draggers;

GSList *lines;

void updateDraggers ();

void updateLines ();

void updateBoxHandles ();

void drawLinesForFace (const SP3DBox *box, Box3D::Axis axis); //, guint corner1, guint corner2, guint corner3, guint corner4);

bool show_lines; /* whether perspective lines are drawn at all */

guint front_or_rear_lines; /* whether we draw perspective lines from all corners or only the

inline bool hasEmptySelection() { return this->selection->isEmpty(); }

bool allBoxesAreSelected (VPDragger *dragger);

GSList * selectedBoxesWithVPinDragger (VPDragger *dragger);

// FIXME: Should this be private? (It's the case with the corresponding function in gradient-drag.h)

// But vp_knot_grabbed_handler

void addDragger (VanishingPoint *vp);

private:

//void deselect_all();

void addLine (NR::Point p1, NR::Point p2, guint32 rgba);

Inkscape::Selection *selection;

sigc::connection sel_changed_connection;

sigc::connection sel_modified_connection;

};

} // namespace Box3D

#endif /* !SEEN_VANISHING_POINT_H */