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

ads_real XCurveIntersection::minLen = 100.0;
DList<XCurveIntersection> XCurveIntersection::GlobalCurveList;

XCurveIntersection::XCurveIntersection(const XCurveSegment &seg)
	: XCurveSegment(seg), segments(seg.GetStartPoint(), seg.GetEndPoint(), seg.GetBulge())
{
	SetLineFlag(LS_FINITE);
}

XCurveIntersection::~XCurveIntersection()
{

}

void XCurveIntersection::DivideToSegments()
{
	XPoint &ptHead = *segments.Head();
	XPoint &ptTail = *segments.Tail();
	XPoint ptNewHead = ptHead, ptNewTail = ptTail;
	int bHeadOnOtherCurve = 0, bTailOnOtherCurve = 0;
	
	for (int i = 0; i < XCurveIntersection::GlobalCurveList.Length(); i++) 
	{
		XCurveIntersection *pSeg = XCurveIntersection::GlobalCurveList[i];
		if (this == pSeg) 
		{
			continue;         
		}

		XCurveSegment &ln = *pSeg;
		
		// 判断当前线的端点是否位于其他线上
		int nPrFlagHead = ptHead & ln;
		int nPrFlagTail = ptTail & ln;
		if (nPrFlagHead == PR_INSIDE || nPrFlagHead == PR_ONPT1 || nPrFlagHead == PR_ONPT2)
		{
			bHeadOnOtherCurve = 1;
		}

		if (nPrFlagTail == PR_INSIDE || nPrFlagTail == PR_ONPT1 || nPrFlagTail == PR_ONPT2)
		{
			bTailOnOtherCurve = 1;
		}
		
		XPoint inPt[2];
		int num = 0;
		{   
			num=Intersection(ln, inPt[0], inPt[1]);
		}

		for (int n = 0; n < num; n++) 
		{
            int ins = 0;
			
			if (ads_distance(ptHead,inPt[n]) < minLen) 
			{
				if (!bHeadOnOtherCurve)
				{
					ptNewHead = inPt[n];
				}
			}
			else if (ads_distance(ptTail,inPt[n]) < minLen) 
			{
				if (!bTailOnOtherCurve)
				{
					ptNewTail = inPt[n];
				}
			}
			else
			{
				ins = 1;				//交点位于中间
			}

            if (ins) 
			{
				segments.Insert(inPt[n]);
			}
		}
	}
	
	if (!Is(CURVE_CIRCLE)) 
	{
        if (!bHeadOnOtherCurve) 
		{
			ptHead = ptNewHead;
		}

        if (!bTailOnOtherCurve)
		{
			ptTail = ptNewTail;
		}
	}
}