MFC画图

// HelloMFCView.cpp : implementation of the CHelloMFCView class
//

#include "stdafx.h"
#include "HelloMFC.h"

#include "HelloMFCDoc.h"
#include "HelloMFCView.h"

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

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView

IMPLEMENT_DYNCREATE(CHelloMFCView, CView)

BEGIN_MESSAGE_MAP(CHelloMFCView, CView)
	//{{AFX_MSG_MAP(CHelloMFCView)
	ON_WM_CREATE()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_MOUSEMOVE()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView construction/destruction

CHelloMFCView::CHelloMFCView()
{
	// TODO: add construction code here
	this->m_ptOrigin=NULL;
}

CHelloMFCView::~CHelloMFCView()
{
}

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

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView drawing

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

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView printing

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView diagnostics

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

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

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

/////////////////////////////////////////////////////////////////////////////
// CHelloMFCView message handlers

int CHelloMFCView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CView::OnCreate(lpCreateStruct) == -1)
		return -1;
	
	// TODO: Add your specialized creation code here
// 	m_btn.Create("吴xx",WS_CHILD | WS_VISIBLE | BS_AUTO3STATE | BS_TOP
// 		,CRect(0,0,100,200),this,123);
	//m_btn.ShowWindow(SW_NORMAL);
	return 0;
}

//点击左键
void CHelloMFCView::OnLButtonDown(UINT nFlags, CPoint point) 
{

	//MessageBox("View Click","提示",MB_OKCANCEL);
	this->m_ptOrigin = m_ptStart = point;
	CView::OnLButtonDown(nFlags, point);
}

void CHelloMFCView::OnLButtonUp(UINT nFlags, CPoint point) 
{
	//////////////////////////////////////////////////////////////////////////
	/* //Win API方式画线	
	HDC hdc;
	hdc=::GetDC(this->m_hWnd);
	MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
	LineTo(hdc, point.x, point.y);
	::ReleaseDC(this->m_hWnd,hdc);	
	*/
	//////////////////////////////////////////////////////////////////////////
	/*CDC *pdc;
	pdc= this->GetDC();
	pdc->MoveTo(this->m_ptOrigin);
	pdc->LineTo(point);
	this->ReleaseDC(pdc);*/
	//////////////////////////////////////////////////////////////////////////
	
	/*不需要GetDC和ReleaseDC, 在构造函数和析构函数中包含。
	CClientDC dc(this);
	//CClientDC dc(this->GetParent());
	dc.MoveTo(m_ptOrigin);
	dc.LineTo(point);*/

	//////////////////////////////////////////////////////////////////////////
	/*
	//CWindowDC dc(this);
	//CWindowDC dc(this->GetParent());
	CWindowDC dc( this->GetDesktopWindow());
	dc.MoveTo(this->m_ptOrigin);
	dc.LineTo(point);
	*/
	//////////////////////////////////////////////////////////////////////////
	/*
	CPen pen(PS_DASHDOT,1,RGB(0xff,0xff,0));
	CClientDC dc(this);

	CPen *pOldPen = dc.SelectObject(&pen);
	dc.MoveTo(m_ptOrigin);
	dc.LineTo(point);
	dc.SelectObject(pOldPen);
	*/
	//////////////////////////////////////////////////////////////////////////
	/*CBrush brush(RGB(0,255,0));
	CClientDC dc(this);
	CRect rect(m_ptOrigin,point);
	dc.FillRect(&rect,&brush);
	*/
//////////////////////////////////////////////////////////////////////////
	/*CBitmap bitmap;
	bitmap.LoadBitmap(IDB_HUA);
	CBrush brush(&bitmap);
	
	CClientDC dc(this);
	CRect rect(m_ptOrigin,point);
	dc.FillRect(&rect,&brush);*/

	/*
	CBrush *brush;
	brush = CBrush::FromHandle((HBRUSH)GetStockObject(NULL_BRUSH));	///不覆盖之前的图形
	CClientDC dc(this);
	CBrush *pOldBrush =dc.SelectObject(brush) ;	
	dc.Rectangle(CRect(m_ptOrigin,point));
	dc.SelectObject(pOldBrush) ;
	*/

	CView::OnLButtonUp(nFlags, point);
}

void CHelloMFCView::OnMouseMove(UINT nFlags, CPoint point) 
{

	if(MK_LBUTTON == nFlags){	//左键按下
		CClientDC dc(this);
		dc.MoveTo(m_ptStart);
		dc.LineTo(point);
		m_ptStart=point;
	}
	CView::OnMouseMove(nFlags, point);
}