ex5_2view.cpp

C++程序设计源代码例

// Ex5_2View.cpp : implementation of the CEx5_2View class
//

#include "stdafx.h"
#include "Ex5_2.h"

#include "Ex5_2Doc.h"
#include "Ex5_2View.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx5_2View

IMPLEMENT_DYNCREATE(CEx5_2View, CView)

BEGIN_MESSAGE_MAP(CEx5_2View, CView)
	//{{AFX_MSG_MAP(CEx5_2View)
	ON_WM_LBUTTONDBLCLK()
	ON_WM_RBUTTONDBLCLK()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CEx5_2View construction/destruction

CEx5_2View::CEx5_2View()
{
	// TODO: add construction code here
    m_flag=0;
}

CEx5_2View::~CEx5_2View()
{
}

BOOL CEx5_2View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx5_2View drawing

void CEx5_2View::OnDraw(CDC* pDC)
{
	CEx5_2Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
    CRect rect;	
	this->GetClientRect(rect); //获得当前客户区	
	if(m_flag)	
	{              
		//在客户区的右下角输出文本串	 
		pDC->TextOut(rect.Width()-200 ,rect.Height()-20,"双击鼠标右键，清除同心圆");
	    // 设置客户区中心位置为原点	 
	    pDC->SetViewportOrg(rect.Width()/2,rect.Height()/2);	     
	    //输出同心圆
	    pDC->Ellipse(-120,-120,120,120);	 
	    pDC->Ellipse(-80,-80,80,80);	 
	    pDC->Ellipse(-40,-40,40,40);
	}
    else	
		pDC->TextOut(0,rect.Height()-20,"双击鼠标左键,显示同心圆");		
}

/////////////////////////////////////////////////////////////////////////////
// CEx5_2View diagnostics

#ifdef _DEBUG
void CEx5_2View::AssertValid() const
{
	CView::AssertValid();
}

void CEx5_2View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CEx5_2Doc* CEx5_2View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CEx5_2Doc)));
	return (CEx5_2Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CEx5_2View message handlers

void CEx5_2View::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_flag=1;	
	this->Invalidate(true); 
	
	CView::OnLButtonDblClk(nFlags, point);
}

void CEx5_2View::OnRButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_flag=0;	
	this->Invalidate(true); 
	
	CView::OnRButtonDblClk(nFlags, point);
}