//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, SH Software Co. Ltd.
// = FileName	:   XDirectionCurve 类
// = Version	:   ver2.0
// = Author		:   zjq
// = CreateDate	:   2002-09-09
// = Description:   XDirectionCurve 类定义
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "XDirectionCurve.h"
#include "XGlobalFunc.h"
#include "XPrivateGlobalFunc.h"

static BOOL IsMirrorTransform(const resbuf *rb1, const resbuf *rb2)
{
    XPoint ptOrg, ptX(1000, 0), ptY(0, 1000), ptOrg1, ptX1, ptY1;
    
	ads_trans(ptOrg, rb1, rb2, FALSE, ptOrg1);
    ads_trans(ptX, rb1, rb2, FALSE, ptX1);
    ads_trans(ptY, rb1, rb2, FALSE, ptY1);
    
	double nAng = CT_std_angle(ads_angle(ptOrg1, ptY1) - ads_angle(ptOrg1, ptX1));
	
    return (fabs(nAng - PI * 1.5) < _angSnap);
}

XDirectionCurve::XDirectionCurve(const XPoint &spt, const XPoint &ept, ads_real dAng, int flg)
	: XCurveSegment(spt,ept,dAng, flg) 
{

}

XDirectionCurve::XDirectionCurve(int flg)
	: XCurveSegment(flg)
{

}

XDirectionCurve::XDirectionCurve(const XDirectionCurve &src)
	: XCurveSegment(src) 
{

}

XDirectionCurve::XDirectionCurve(const XArc &ar, int bMinus) 
{
	XCurveSegment &seg = *this;
	seg = ar;
	
	if (bMinus) 
	{
		m_dBulge = -fabs(m_dBulge);
		XPrivate::Exchange(m_startPoint, m_endPoint);
	}
}

XDirectionCurve::~XDirectionCurve()
{

}

XArc XDirectionCurve::GetArc() const
{
	if (IsMinusArc()) 
	{
		return XArc(m_endPoint, m_startPoint, fabs(m_dBulge));
	}

	return XArc(m_startPoint, m_endPoint, m_dBulge);
}

int XDirectionCurve::IsMinusArc() const 
{
	return m_dBulge < -1.0E-8; 
}

XCurveSegment XDirectionCurve::GetCurve() const
{
	XCurveSegment seg;
	if (IsMinusArc())
	{
		seg = GetArc();
	}
	else
	{
		seg = *this;
	}
	
	return seg;
}

void XDirectionCurve::TransUCS(const resbuf *rb1, const resbuf *rb2)
{
	XLine::TransUCS(rb2, rb2);
	if (IsMirrorTransform(rb1, rb2))
	{
		m_dBulge = -m_dBulge;
	}
}

void XDirectionCurve::TransUCS(ads_matrix mat)
{
	XLine::TransformBy(mat);
	if (IsMirrorMatrix(mat))
	{
		m_dBulge = -m_dBulge;
	}
}

void XDirectionCurve::Reverse()
{
	XPrivate::Exchange(m_startPoint, m_endPoint);
	m_dBulge = -m_dBulge;
}

// dist:  <0 left side;  >0 right siede
XDirectionCurve XDirectionCurve::Offset(ads_real dist, int flg) const
{	
	assert(!Is(CURVE_CIRCLE));
	
	XPoint spt, ept;
	if (Is(CURVE_LINE)) 
	{
		ads_real ang = XLine::Direction()-PI/2.0;
		ads_polar(m_startPoint, ang, dist, spt);
		ads_polar(m_endPoint, ang, dist, ept);
		
		return XDirectionCurve(spt, ept, 0.0, flg);
	} 
	
	XArc aArc = GetArc();
	ads_real r = (!IsMinusArc()) ? (aArc.GetRadius() + dist) : (aArc.GetRadius() - dist);
	
	if (r < _DIST_SNAP) 
	{
		return XDirectionCurve();
	}
	
	aArc.SetRadius(r);
	
	XDirectionCurve curve(aArc, IsMinusArc());
	curve.m_nFlag = flg;	
	return curve;	
}

ads_real XDirectionCurve::IDirection(int npt) const 
{
	if (IsMinusArc()) 
	{
		return GetCurve().IDirection(1 - npt);
	}
	
	return XCurveSegment::IDirection(npt);
}

int XDirectionCurve::OnWhichSide(const XPoint &src) const 
{
	int nSide = GetCurve().OnWhichSide(src);
	if (IsMinusArc())
	{
		nSide = 1 - nSide;
	}
	
	return nSide;
}

int XDirectionCurve::OnWhichSide1(const XPoint &src) const 
{
	int nSide = GetCurve().OnWhichSide1(src);
	if (IsMinusArc())
	{
		nSide = 1 - nSide;
	}
	
	return nSide;
}

ads_real XDirectionCurve::PathArea(XPoint &tmpt) const 
{
	double nRet = GetCurve().PathArea(tmpt);
	if (IsMinusArc())
	{
		nRet = -nRet;
	}
	
	return nRet;
}

ads_real XDirectionCurve::Direction(const XPoint &pt) const 
{
	double nRet = GetCurve().Direction(pt);
	if (IsMinusArc())
	{
		nRet = -nRet;
	}
	
	return nRet;
}

void XDirectionCurve::AsPoly2D(XPoly2D &poly) const 
{
	GetCurve().AsPoly2D(poly);
	if (IsMinusArc())
	{
		poly.Reverse();
	}
}

// 从端点开始沿曲线走过给定距离的点向量
int XDirectionCurve::Polar(ads_real dDist, XPointDir2d  &res, BOOL bFromStart) const 
{
	return GetCurve().Polar(dDist, res, IsMinusArc() ? (!bFromStart) : bFromStart);
}

// 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
ads_real XDirectionCurve::PathDistance(const XPoint &pt, BOOL bFromStart) const 
{
	return GetCurve().PathDistance(pt, IsMinusArc() ? (!bFromStart) : bFromStart);
}

// 求通过pt点的法向
ads_real XDirectionCurve::OrthoDirection(const XPoint &pt) const 
{
	double nRet = GetCurve().OrthoDirection(pt);
	if (IsMinusArc())
	{
		nRet = CT_std_angle(nRet + PI);
	}
	
	return nRet;
}

void XDirectionCurve::SetPoints(const XPoint &ptStart, const XPoint &ptEnd) 
{	
	if (IsMinusArc()) 
	{
		XCurveSegment seg = GetCurve();
		seg.SetPoints(ptEnd, ptStart);
		m_startPoint = seg.GetEndPoint();
		m_endPoint = seg.GetStartPoint();
		m_dBulge = -seg.GetBulge();
	}
	else 
	{
		XCurveSegment::SetPoints(ptStart, ptEnd);
	}
}

bool XDirectionCurve::IsDirectionCurve()
{
	return true;
}