//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, SH Software Co. Ltd.
// = FileName	:   XDirectionCurve类
// = Version	:   ver2.0
// = Author		:   zjq
// = CreateDate	:   2002-09-09
// = Description:   XDirectionCurve类声明
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#ifndef _XDIRECTIONCURVE_H_
#define _XDIRECTIONCURVE_H_

#ifndef _XCURVESEGMENT_H_
#include "XCurveSegment.h"
#endif

#ifndef _XARC_H_
#include "XArc.h" 
#endif

#ifndef _XPOLY2D_H_
#include "XPoly2D.h" 
#endif

#ifndef _XPOINT_H_
#include "XPoint.h"
#endif

#ifndef _XPointDir2d_H_
#include "XPointDir2d.h"
#endif

class GEOAPI XDirectionCurve : public XCurveSegment
{
public:
	XDirectionCurve(int flg = LS_FINITE);
	XDirectionCurve(const XArc &ar, int bMinus = 0);
	XDirectionCurve(const XDirectionCurve &src);
	XDirectionCurve(const XPoint &spt, const XPoint &ept, ads_real dAng = 0.0, int flg = LS_FINITE);

	virtual ~XDirectionCurve();

 	virtual	int IsMinusArc() const;

    // 与曲线方向有关的成员
	virtual int  OnWhichSide(const XPoint &src) const;
	virtual int  OnWhichSide1(const XPoint &src) const;
   
    // 从端点开始沿曲线走过给定距离的点向量
	virtual int  Polar(ads_real nDist, XPointDir2d &res, BOOL bFromStart = TRUE) const;

	virtual void Reverse();

	virtual void TransUCS(ads_matrix mat);
	virtual void TransUCS(const resbuf *, const resbuf *);
 	
	virtual void AsPoly2D(XPoly2D &poly) const;

	virtual void SetPoints(const XPoint &ptStart, const XPoint &ptEnd);

	// 端点处朝曲线段内部的方向
	virtual ads_real IDirection(int pt) const;

	// 取得指向内部的方向支持Line,Arc，不支持Cir。 pt--0:start; 1--end
	virtual ads_real PathArea(XPoint &tmpt) const;

	virtual ads_real Direction(const XPoint &pt) const;

    // 求到端点的沿曲线线位移, 在线内距离为正,否则为负, 和Polar配合使用
    // pt如果不在线上的话则先投影
	virtual ads_real PathDistance(const XPoint &pt, BOOL bFromStart = TRUE) const;

    // 求通过pt点的法向
	virtual ads_real OrthoDirection(const XPoint &pt) const;
	
	// dist left<0 / right>0
	virtual XCurveSegment GetCurve() const;
	virtual XDirectionCurve Offset(ads_real dist, int flg) const;

	virtual bool IsDirectionCurve();

	XArc  GetArc() const; 	
};

#endif