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

#ifndef _XENTITY_H_
#include "XEntity.h"
#endif

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

#ifndef _XLINE_H_
#include "XLine.h"
#endif

class GEOAPI XPlane : public XEntity
{
public:
    
	XPlane();

    XPlane(double aa, double bb, double cc, double dd);

    XPlane(const XPoint &ptOrg, const XVector3D &vtNorm);
    
	XPlane(const XPlane &src);
	
	virtual ~XPlane();

	virtual bool IsKindOf(TEntityId entType) const;
	virtual TEntityId Type() const;
	virtual void CopyFrom(const XEntity* pImpSrc);
	
    virtual BOOL IsValid() const;

    // 3点确定一平面方程
    virtual BOOL SetFrom3p(const XPoint &pt1, const XPoint &pt2, const XPoint &pt3);

    // 平面与线求交，考虑了线是否为无限长
    virtual BOOL Intersect(const XLine &ln, XPoint &ptInt) const;

    // 平面与平面求交，求交线（无限长）
    virtual BOOL Intersect(const XPlane &plan, XLine &ln) const;

    virtual XVector3D GetNormal() const;

   	virtual double GetAngle(XVector3D vtLight)const;

	virtual bool IsReflect(XVector3D vtLight)const;

	virtual bool Reflect(XVector3D vtLight,XVector3D& vtRes)const;
	
	virtual double GetParaA()const;
	virtual void SetParaA(const double dVal);
	
	virtual double GetParaB()const;
	virtual void SetParaB(const double dVal);
	
	virtual double GetParaC()const;
	virtual void SetParaC(const double dVal);
	
	virtual double GetParaD()const;
	virtual	void SetParaD(const double dVal);

    XPlane & operator = (const XPlane &src);
	
    BOOL operator !() const;
	
public:
	
    double m_dParaA, m_dParaB, m_dParaC, m_dParaD;
};

extern GEOAPI BOOL GetShadowMatrix(const XPlane&plane, const XVector3D &vtLight, AcGeMatrix3d &mShadowMatrix);

#endif