#ifndef T_L2LAUTOCLOSER_H
#define T_L2LAUTOCLOSER_H

#include <memory>

#include "tgeometry.h"

#undef DVAPI
#undef DVVAR
#ifdef TVECTORIMAGE_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

#ifdef _WIN32
#pragma warning(disable : 4251)
#endif

//forward declaration
class TStroke;

//-----------------------------------------------------------------------------

//! Line-to-line autocloser
class DVAPI TL2LAutocloser
{
	class Imp;
	std::unique_ptr<Imp> m_imp;

public:
	TL2LAutocloser();
	~TL2LAutocloser();

	struct Segment {
		//! the segments returned by the Line-to-line autocloser
		TStroke *stroke0, *stroke1; // the two involved strokes
		double w0, w1;				// the w-parameters
		TThickPoint p0, p1;			// the related points
		double dist2;				// the (squared) points distance
	};

	//! segments longer than sqrt(dist2) are not considered. the default is 50^2
	void setMaxDistance2(double dist2);
	double getMaxDistance2() const;

	//! search line-to-line autoclosing segments.
	//! Note: it computes and caches some information about stroke0 and stroke1
	//! you are not supposed to change strokes between two subsequent calls to search()
	void search(std::vector<Segment> &segments, TStroke *stroke0, TStroke *stroke1);

	//! use this method if you have already computed the intersections
	void search(
		std::vector<Segment> &segments,
		TStroke *stroke0, TStroke *stroke1,
		const std::vector<DoublePair> &intersection);

	//! debug only. show the internal state related to the last performed search
	void draw();

private:
	// not implemented
	TL2LAutocloser(const TL2LAutocloser &);
	const TL2LAutocloser &operator=(const TL2LAutocloser &);
};

//---------------------------------------------------------------------------------------

#endif // T_L2LAUTOCLOSER_H