// Copyright (c) 2007, Rodrigo Braz Monteiro
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// Aegisub Project http://www.aegisub.org/
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// $Id$

/// @file spline_curve.h
/// @see spline_curve.cpp
/// @ingroup visual_ts
///


#pragma once


///////////
// Headers
#include "vector2d.h"



/// DOCME
enum CurveType {

	/// DOCME
	CURVE_INVALID,

	/// DOCME
	CURVE_POINT,

	/// DOCME
	CURVE_LINE,

	/// DOCME
	CURVE_BICUBIC
};



/// DOCME
/// @class SplineCurve
/// @brief DOCME
///
/// DOCME
class SplineCurve {
private:
	float GetClosestSegmentPart(Vector2D p1,Vector2D p2,Vector2D p3) const;
	float GetClosestSegmentDistance(Vector2D p1,Vector2D p2,Vector2D p3) const;

public:

	/// DOCME

	/// DOCME

	/// DOCME

	/// DOCME
	Vector2D p1,p2,p3,p4;

	/// DOCME
	CurveType type;

	SplineCurve();
	void Split(SplineCurve &c1,SplineCurve &c2,float t=0.5);
	void Smooth(Vector2D prev,Vector2D next,float smooth=1.0f);

	Vector2D GetPoint(float t) const;
	Vector2D GetStartPoint() const;
	Vector2D GetEndPoint() const;
	Vector2D GetClosestPoint(Vector2D ref) const;
	float GetClosestParam(Vector2D ref) const;
	float GetQuickDistance(Vector2D ref) const;
};


