//-----------------------------------------------------------------------------+
// Copyright (C), 1998-2007, Beijing Tangent Software Co. Ltd.
// = FileName	:   TGGe3DFace3Pt 类
// = Version	:   ver2.0
// = Author		:   wlw
// = CreateDate	:   2002-09-09
// = Description:   TGGe3DFace3Pt 类定义
// = Maintainers: 
//                  
//-----------------------------------------------------------------------------+
#include "StdAfx.h"
#include "TGGe3DFace3Pt.h"
#include "TGGeLine.h"

TGGe3DFace3Pt::TGGe3DFace3Pt(TEntitySet &entFace)
   : TGGe3DFace(entFace)
{
	if (GetFlag() & FLAG_UNNORMAL) 
	{
		return;
	}
	
	int nFlag = GetFlag();
	for (int i = 0; i < 4; i++) 
	{
		int j = i + 1;
		if (j == 4) 
		{
			j = 0;
		}
		
		TGGeLine aLine(GetVertex(i), GetVertex(j));
		if (aLine.GetLength() < _DIST_SNAP) 
		{
			switch(j) 
			{
			case 1:
				SetVertex(1, GetVertex(2));
				SetVertex(2, GetVertex(3));
								
				if (nFlag & 0x02) 
				{
					nFlag |= 0x01;
				}
				
				if (nFlag & 0x04)
				{
					nFlag |= 0x02;
				}
				
				if (nFlag & 0x08)
				{
					nFlag |= 0x04;
				}
				
				break;
			case 2:
				SetVertex(2, GetVertex(3));
				
				if (nFlag & 0x04) 
				{
					nFlag |= 0x02;
				}
				
				if (nFlag & 0x08) 
				{
					nFlag |= 0x04;
				}
				
				break;
			case 3:
				if (nFlag & 0x08)
				{
					nFlag |= 0x04;
				}
				
				break;
			}
			
			nFlag &= ~0x08;
			
			if (nFlag == 0x01 || nFlag == 0x02 || nFlag == 0x04)
			{
				;
			}
			else 
			{
				nFlag |= FLAG_UNNORMAL;
			}
			SetFlag(nFlag);
			return;
		}
	}
	
	nFlag |= FLAG_UNNORMAL;
	SetFlag(nFlag);
}

TGGe3DFace3Pt::~TGGe3DFace3Pt()
{

}

int TGGe3DFace3Pt::GetMergeLine(TGGeLine *pLine)
{
	ASSERT(pLine != NULL);

	if (!(*this)) 
	{
		return RTERROR;
	}
	
	switch (GetFlag()) 
	{
	case 0x01:  
		pLine->SetPoints(GetVertex(0), GetVertex(1));
		break;
	case 0x02:  
		pLine->SetPoints(GetVertex(1), GetVertex(2));
		break;
	default:    
		pLine->SetPoints(GetVertex(2), GetVertex(0));
		break;
	}
	
	return RTNORM;
}


int TGGe3DFace3Pt::MergeEdge()
{
	if (!(*this)) 
	{
		return -1;
	}

	int rc;
	switch (GetFlag()) 
	{
	case 0x01:  
		rc = 0;
		break;
	case 0x02:  
		rc = 1;  
		break;
	default: 
		rc = 2;
		break;
	}

	return rc;
}

int TGGe3DFace3Pt::OppHidePoint()
{
	if (!(*this))
	{
		return -1;
	}
	
	int rc;
	switch(GetFlag()) 
	{
	case 0x01: 
		rc = 2;
		break;
	case 0x02:  
		rc = 0;  
		break;
	default:    
		rc = 1;
		break;
	}

	return rc;
}