cpaintdcdemoview.cpp

通过源代码详细的介绍了VC++的用法

// CPaintDCDemoView.cpp : implementation of the CCPaintDCDemoView class
//

#include "stdafx.h"
#include "CPaintDCDemo.h"

#include "CPaintDCDemoDoc.h"
#include "CPaintDCDemoView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView

IMPLEMENT_DYNCREATE(CCPaintDCDemoView, CView)

BEGIN_MESSAGE_MAP(CCPaintDCDemoView, CView)
	//{{AFX_MSG_MAP(CCPaintDCDemoView)
	ON_WM_PAINT()
	ON_WM_LBUTTONDOWN()
	//}}AFX_MSG_MAP
	// Standard printing commands
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView construction/destruction

CCPaintDCDemoView::CCPaintDCDemoView()
{
	// TODO: add construction code here

}

CCPaintDCDemoView::~CCPaintDCDemoView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView drawing

void CCPaintDCDemoView::OnDraw(CDC* pDC)
{
	CCPaintDCDemoDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here

}

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView printing

BOOL CCPaintDCDemoView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CCPaintDCDemoView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CCPaintDCDemoView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CCPaintDCDemoView message handlers

void CCPaintDCDemoView::OnPaint() 
{
	CPaintDC dc(this); // device context for painting	
	// TODO: Add your message handler code here
	CRect rect;//创建矩形区域，存储客户窗口区域
	GetClientRect(&rect);//得到客户区的范围放到rect中
	dc.Rectangle(0,0,(rect.left+rect.right)/2,(rect.top+rect.bottom)/2);//在客户窗口的左上角绘制矩形，大小占据1/4窗口
	dc.Ellipse((rect.left+rect.right)/2,(rect.top+rect.bottom)/2,rect.right,rect.bottom);//在客户窗口的右下角绘制椭圆，大小占据1/4窗口	
	// Do not call CView::OnPaint() for painting messages
}

void CCPaintDCDemoView::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CClientDC dc(this);//创建CClientDC类对象
	CRect rc;//创建矩形区域，存储客户窗口区域
	GetClientRect(&rc);//得到客户区的范围放到rc中
	dc.MoveTo(0,0);//将画笔的当前位置移到客户区的左上角
	dc.LineTo(rc.right,rc.bottom);//从左上角画直线到右下角
	dc.MoveTo(rc.right,0);//将画笔的当前位置移到客户区的上上角
	dc.LineTo(0,rc.bottom);//从右上角画直线到左下角
	CView::OnLButtonDown(nFlags, point);
}