drwdoc.cpp

用VC做的一个画直线和曲线的程序。

// drwDoc.cpp : implementation of the CDrwDoc class
//

#include "stdafx.h"
#include "drw.h"

#include "drwDoc.h"

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

/////////////////////////////////////////////////////////////////////////////
// CDrwDoc

IMPLEMENT_DYNCREATE(CDrwDoc, CDocument)

BEGIN_MESSAGE_MAP(CDrwDoc, CDocument)
	//{{AFX_MSG_MAP(CDrwDoc)
		// 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()

/////////////////////////////////////////////////////////////////////////////
// CDrwDoc construction/destruction

CDrwDoc::CDrwDoc()
{
	// TODO: add one-time construction code here
Lines=NULL;
}

CDrwDoc::~CDrwDoc()
{
}

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

	// TODO: add reinitialization code here
	// (SDI documents will reuse this document)
    Lines=NULL;    //开始时为空
	return TRUE;
}



/////////////////////////////////////////////////////////////////////////////
// CDrwDoc serialization

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

/////////////////////////////////////////////////////////////////////////////
// CDrwDoc diagnostics

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

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

/////////////////////////////////////////////////////////////////////////////
// CDrwDoc commands

CLine * CDrwDoc::AddLine(CPoint x,CPoint y)
{
	CLine *pLine=new CLine;
	 pLine->AddLine(x,y);     //加点
	 pLine->next=NULL;        //下一个为空

  if(Lines==NULL)
	  Lines=pLine;
  else
  {
	  CLine *p;
	  for(p=Lines;p->next!=NULL;p=p->next);  //有分号
	  p->next=pLine;
  }

return pLine;
}

void CDrwDoc::DrawLine(CDC *pDC)
{
	CLine *p=Lines;
 while(p!=NULL)
 {
	 p->Draw(pDC);
	 p=p->next;
 }

}

void CDrwDoc::DeleteContents() 
{
	// TODO: Add your specialized code here and/or call the base class
	while(Lines!=NULL)
	{
		CLine *p=Lines;
		Lines=Lines->next;
		delete p;               //释放链表内存
	}

	CDocument::DeleteContents();
}