polygonlist.cpp

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// PolygonList.cpp: implementation of the CPolygonList class.
//
//////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "MagicScissors.h"
#include "PolygonList.h"

#include "Polygon.h"


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

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

CPolygonList::CPolygonList()
{
	m_pRoot = m_pLast = NULL;
	m_pSelect = NULL;
}

CPolygonList::~CPolygonList()
{
	if( m_pRoot ) DeleteAll();
}

void CPolygonList::Add(CPolygon* pPolygon)
{
	if( m_pLast )
	{
		m_pLast->m_pNext = pPolygon;
		pPolygon->m_pPrev = m_pLast;
		m_pLast = pPolygon;
	}
	else
	{
		m_pRoot = pPolygon;
		m_pLast = pPolygon;
	}
}

void CPolygonList::Delete(CPolygon* pPolygon)
{
	CPolygon* pObj;
	pObj = pPolygon;
	CPolygon* pNext;
	CPolygon* pPrev;
		
	if( pObj == m_pRoot )
	{
		m_pRoot = m_pRoot->m_pNext;
		if( m_pRoot )
			m_pRoot->m_pPrev = NULL;
		else
			m_pLast = NULL;
	}
	else if( pObj == m_pLast )
	{
		m_pLast = m_pLast->m_pPrev;
		m_pLast->m_pNext = NULL;
	}
	else
	{
		pNext = pObj->m_pNext;
		pPrev = pObj->m_pPrev;
		pPrev->m_pNext = pNext;
		pNext->m_pPrev = pPrev;
	}
	delete pObj;
}

void CPolygonList::DeleteAll()
{
	CPolygon* pObj;
	CPolygon* pNext;

	pObj = m_pRoot;

	while(pObj)
	{
		pNext = pObj->m_pNext;
		delete pObj;
		pObj = pNext;
	}
	m_pRoot = m_pLast = m_pSelect = NULL;
}

void CPolygonList::Select(CPoint pnt)
{
	m_pSelect = NULL;

	CPolygon* pObj = m_pRoot;

	while(pObj)
	{
		if( pObj->PtInRgn(pnt) )
		{
			m_pSelect = pObj;
			return;
		}
		pObj = pObj->m_pNext;
	}
}

void CPolygonList::ClearSelect()
{
	m_pSelect = NULL;
}

void CPolygonList::Paint(CDC* pDC)
{
	CPolygon* pPolygon;

	pPolygon = m_pRoot;

	while( pPolygon )
	{
		if( pPolygon == m_pSelect )
			pPolygon->Paint(pDC, RGB(255,0,0) );
		else
			pPolygon->Paint(pDC, RGB(0,0,255) );
		pPolygon = pPolygon->m_pNext;
	}
}

int CPolygonList::GetTotal()
{
	int n = 0;

	CPolygon* pObj;
	pObj = m_pRoot;

	while(pObj)
	{
		n++;
		pObj = pObj->m_pNext;
	}
	return n;
}

CPolygon* CPolygonList::GetPolygon(int n)
{
	CPolygon* pObj = m_pRoot;

	for( int i = 0 ; i < n ; i++ )
	{
		if( !pObj ) return NULL;
		pObj = pObj->m_pNext;
	}
	return pObj;
}