// Link.cpp: implementation of the Link class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "ConvexHull.h"
#include "Link.h"

#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif

//////////////////////////////////////////////////////////////////////
// Construction/Destruction
//////////////////////////////////////////////////////////////////////

Link::Link()
{
	 m_First=0;

}

Link::~Link()
{

}
MyPoint* Link::Back(){
	MyPoint* cur=m_First;
	while(cur->right){
		cur=cur->right;
	}
	return cur;
}
int Link::Length() const{
   MyPoint *cur=m_First;
   int len=0;
   while(cur){
      len++;
	  cur=cur->right;
   }
   return len;
} 
void Link::Append(MyPoint& x){
	
	if(m_First){ 
	   MyPoint* last=Back();
	   last->right=&x;
	   x.left=last;	
	   
	}
	else{
		m_First=&x;
		m_First->left=0;
	}
	x.right=NULL;

}