//-------------------------------------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGMeshNode3D Àà
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGMeshNode3D ¶¨Òå
// = Maintainers: 
//                  
//-------------------------------------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TGMeshNode3D.h"

TGMeshNode3D::TGMeshNode3D(const TGPoint&pt):TGPoint(pt)
{

}

TGMeshNode3D::~TGMeshNode3D()
{
	Clear();
}

void TGMeshNode3D::AppendEdge(TGMeshEdge3D* pEdge)
{
	m_lstEdge.AddTail(pEdge);
}

void TGMeshNode3D::Clear()
{
	TDualPtrList<TGMeshEdge3D*> temp;
	temp.Conbine(m_lstEdge);
}

TGMeshEdge3D* TGMeshNode3D::GetOnlyEdge()
{
	return m_lstEdge.IsEmpty()?NULL:m_lstEdge[0];
}

void TGMeshNode3D::RemoveEdge(TGMeshEdge3D*pEdge)
{
	if (m_lstEdge.FindTo(pEdge))
	{
		m_lstEdge.FetchCur();
	}
}

bool TGMeshNode3D::IsEndNode() const
{
	return m_lstEdge.GetLength() == 1;
}

void TGMeshNode3D::Arrange()
{
}

TGMeshEdge3D* TGMeshNode3D::FindNextEdge(TGMeshEdge3D* pEdgeFrom)
{
	if (IsEndNode())
	{
		return NULL;
	}
	
	m_lstEdge.FindTo(pEdgeFrom);
	m_lstEdge.MoveToNext();
	if (m_lstEdge.IsOut())
	{
		m_lstEdge.MoveToFirst();
	}
	return m_lstEdge.GetCurData();
}

TGMeshEdge3D* TGMeshNode3D::FindPreEdge(TGMeshEdge3D* pEdgeFrom)
{
	if (IsEndNode())
	{
		return NULL;
	}
	
	m_lstEdge.FindTo(pEdgeFrom);
	m_lstEdge.MoveToPre();
	if (m_lstEdge.IsOut())
	{
		m_lstEdge.MoveToLast();
	}
	return m_lstEdge.GetCurData();
}

TGMeshEdge3D* TGMeshNode3D::FindNextSDEdge(TGMeshEdge3D* pEdgeFrom)
{
	if (IsEndNode())
	{
		return NULL;
	}
	
	m_lstEdge.FindTo(pEdgeFrom);
	
	m_lstEdge.MoveToNext();
	if (m_lstEdge.IsOut())
	{
		m_lstEdge.MoveToFirst();
	}
	
	TGMeshEdge3D *pEdge = m_lstEdge.GetCurData();
	if (pEdge == pEdgeFrom || pEdge->GetNode(1) != this)
	{
		return NULL;
	}
	
	return pEdge;
}

TGMeshEdge3D* TGMeshNode3D::FindPreSDEdge(TGMeshEdge3D* pEdgeFrom)
{
	if (IsEndNode())
	{
		return NULL;
	}
	
	m_lstEdge.FindTo(pEdgeFrom);
	
	m_lstEdge.MoveToPre();
	if (m_lstEdge.IsOut())
	{
		m_lstEdge.MoveToLast();
	}
	
	TGMeshEdge3D *pEdge=m_lstEdge.GetCurData();
	if (pEdge == pEdgeFrom || pEdge->GetNode(2) != this)
	{
		return NULL;
	}
	return pEdge;
}