// Copyright (C), 1998-2007, Beijing Tangent Engineering Software Co. Ltd.
// = FileName:     RoadArith.h
// = Version:      8.5
// = Author:       lgh
// = Date:         2010-9-7 14:44:54
// = Description:  道路相关密切的一些处理算法
// = Maintainers:
#ifndef __TCH_SITIPLAN_ROADADAPTERFORLINK_H__
#define __TCH_SITIPLAN_ROADADAPTERFORLINK_H__

#include <geray2d.h>

class CRoadArith
{
private:
	CRoadArith() {};
	~CRoadArith(){};

public:
	// 处理道路的倒角
	// 按照正常情况考虑问题，排除异常情况
	// 返回值：是否正确的执行倒角
	// InterCircle：生成的倒角
	// 线段跟线段的倒角
	static bool InterCircleLineAndLine(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2,
		double dRadius, AcGeCircArc2d &interCircle);

	// 线段跟弧线的倒角，参数同上
	static bool InterCircleLineAndArc(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2,
		double dRadius, AcGeCircArc2d &interCircle);

	static bool InterCircleArcAndLine(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2,
		double dRadius, AcGeCircArc2d &interCircle);

	// 弧线跟弧线的倒角，参数同上
	static bool InterCircleArcAndArc(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2,
		double dRadius, AcGeCircArc2d &interCircle);

	// 倒角线在延长线附近存在两个交点， 应该从中选取一个合适的交点。
	static bool TestProperPoint(const AcGeLineSeg2d &line1, bool bStart1, const AcGeCircArc2d &arc2, bool bStart2,
		const AcGePoint2d &pt1, const AcGePoint2d &pt2, AcGePoint2d &ptDest);
	static bool TestProperPoint(const AcGeCircArc2d &arc1, bool bStart1, const AcGeCircArc2d &arc2, bool bStart2,
		const AcGePoint2d &pt1, const AcGePoint2d &pt2, AcGePoint2d &ptDest);

private:
	// 交点是否在bDir的方向上。验证点在线上，或者在对应段的延伸线上。
	static bool PointInLineDir(const AcGeLineSeg2d &line, bool bDir, const AcGePoint2d &ptInter);
	static bool PointInArcDir(const AcGeCircArc2d &arc, bool bDir, const AcGePoint2d &ptInter);

	// 计算距离bStart端的距离。
	static void NearPtInLine(const AcGeLineSeg2d &line, bool bStart, const AcGePoint2d &pt1, const AcGePoint2d &pt2,
		double &dLen1, double &dLen2);
	static void NearPtInArc(const AcGeCircArc2d &arc, bool bStart, const AcGePoint2d &pt1, const AcGePoint2d &pt2,
		double &dLen1, double &dLen2);


	// 判断两线段（圆弧）是否可以执行倒角，如果可以倒角则计算交点
	static bool ForCenterLineAndLine(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2, double dRadius, AcGePoint2d &ptCenter);
	static bool ForCenterLineAndArc(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2, double dRadius, AcGePoint2d &ptCenter);
	static bool ForCenterArcAndLine(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2, double dRadius, AcGePoint2d &ptCenter);
	static bool ForCenterArcAndArc(AcGeCurve2d *pEnt1, bool bDir1, AcGeCurve2d *pEnt2, bool bDir2, double dRadius, AcGePoint2d &ptCenter);


	// 构造线段所对应的弧线
	static AcGeRay2d LineSegToRay(const AcGeLineSeg2d &line, bool bDir);
	// 算法：以两个起点相连的线段为例，讲解该偏移算法。
	// line1 的两个向量：左向量vecL1，右向量vecR1
	// line2 的两个向量：左向量vecL2，右向量vecR2
	// line1,line2分别有两个方向向量：dri1, dir2;
	// line1、line2的左向量和右向量分别跟对方的方向向量比较。点积为正的即偏移方向。
	// 以统一的向量形式来描述两条相交边线的关系。判断他们应该的偏移方向
	static bool Off(const AcGeVector2d &vecL1, const AcGeVector2d &vecR1, const AcGeVector2d &vecL2, const AcGeVector2d &vecR2,
		const AcGeVector2d &dir1, const AcGeVector2d &dir2, bool &bLeft1, bool &bLeft2);

	// 计算两个倒角线的偏向，
	// ret：bLeft1, bLeft2;
	static bool FindUnitVec(const AcGeLineSeg2d &line1, bool bDir1, const AcGeLineSeg2d &line2, bool bDir2,
		bool &bLeft1, bool &bLeft2);
	static bool FindUnitVec(const AcGeLineSeg2d &line1, bool bDir1, const AcGeCircArc2d &arc2, bool bDir2,
		bool &bLeft1, bool &bIn2);
	static bool FindUnitVec(const AcGeCircArc2d &arc1, bool bDir1, const AcGeCircArc2d &arc2, bool bDir2,
		bool &bIn1, bool &bIn2);

	// 构造圆弧,
	static void ConInterCircle(const AcGePoint2d &ptCenter, const AcGePoint2d &pt1, const AcGePoint2d &pt2, AcGeCircArc2d &interArc);

};

#endif