drawinpdadoc.cpp

在PDA中的画图程序

// DrawInPDADoc.cpp : implementation of the CDrawInPDADoc class
//

#include "stdafx.h"
#include "DrawInPDA.h"
#include "Shape.h"
#include "DrawInPDADoc.h"
#include "Tool.h"


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

/////////////////////////////////////////////////////////////////////////////
// CDrawInPDADoc

IMPLEMENT_DYNCREATE(CDrawInPDADoc, CDocument)

BEGIN_MESSAGE_MAP(CDrawInPDADoc, CDocument)
	//{{AFX_MSG_MAP(CDrawInPDADoc)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CDrawInPDADoc construction/destruction

CDrawInPDADoc::CDrawInPDADoc()
{
	// TODO: add one-time construction code here

}

CDrawInPDADoc::~CDrawInPDADoc()
{
		POSITION pos = m_Shapes.GetHeadPosition();//POSITION: A value used to denote the position of an 
	                                          //element in a collection; used by MFC collection classes.
                                             //Gets the position of the head element of this list.
	while (pos != NULL)
		delete m_Shapes.GetNext(pos);//
}

BOOL CDrawInPDADoc::OnNewDocument()
{
	if (!CDocument::OnNewDocument())
		return FALSE;

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)

	return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
// CDrawInPDADoc serialization

void CDrawInPDADoc::Serialize(CArchive& ar)
{
	if (ar.IsStoring())
	{
		// TODO: add storing code here
	}
	else
	{
		// TODO: add loading code here
	}
}

/////////////////////////////////////////////////////////////////////////////
// CDrawInPDADoc diagnostics

#ifdef _DEBUG
void CDrawInPDADoc::AssertValid() const
{
	CDocument::AssertValid();
}

void CDrawInPDADoc::Dump(CDumpContext& dc) const
{
	CDocument::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CDrawInPDADoc commands
//class CShape


void CDrawInPDADoc::Draw(CDC *pDC)
{
POSITION pos = m_Shapes.GetHeadPosition();

	while (pos != NULL)
	{
		CShape* pShape = m_Shapes.GetNext(pos);
		pShape->Draw(pDC);
	}
}


void CDrawInPDADoc::ShapeAdd(CShape *pShape)
{
	m_Shapes.AddTail(pShape);//Adds a new element or list of elements to the tail of this list. The list
	                         //can be empty before the operation.
    POSITION pos = m_Shapes.GetHeadPosition();
}

CShape* CDrawInPDADoc::Select(const CPoint &point)
{
	CRect rect(point - CSize(2,2), CSize(4, 4));
	POSITION pos = m_Shapes.GetTailPosition();
	while (pos != NULL)
	{
		CShape* pObj = m_Shapes.GetPrev(pos);
		if (pObj->Intersects(rect))
			return pObj;
	}
	return NULL;

}