drawin~2.cpp

vc++net很不错的一个工具

// DrawingView.cpp : CDrawingView 类的实现
//

#include "stdafx.h"
#include "Drawing.h"

#include "DrawingDoc.h"
#include "DrawingView.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#endif


// CDrawingView

IMPLEMENT_DYNCREATE(CDrawingView, CView)

BEGIN_MESSAGE_MAP(CDrawingView, CView)
	// 标准打印命令
	ON_COMMAND(ID_FILE_PRINT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_DIRECT, CView::OnFilePrint)
	ON_COMMAND(ID_FILE_PRINT_PREVIEW, CView::OnFilePrintPreview)
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_COMMAND(ID_CUT, OnCut)
	ON_COMMAND(ID_TEST, OnTest)
END_MESSAGE_MAP()

// CDrawingView 构造/销毁

CDrawingView::CDrawingView()
{
	// TODO: 在此处添加构造代码
	//初始时，未拖动鼠标
	m_bDraw=FALSE;
	//载入十字光标
	m_hCursor=AfxGetApp()->LoadStandardCursor(IDC_CROSS);	
    
}

CDrawingView::~CDrawingView()
{
}

BOOL CDrawingView::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: 在此处通过修改 CREATESTRUCT cs 来修改窗口类或
	// 样式
	cs.lpszClass=AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW,0,(HBRUSH)::GetStockObject(WHITE_BRUSH),0);
	return CView::PreCreateWindow(cs);
}

// CDrawingView 绘制

void CDrawingView::OnDraw(CDC* pDC)
{
	CDrawingDoc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);

	// TODO: 在此处为本机数据添加绘制代码
}


// CDrawingView 打印

BOOL CDrawingView::OnPreparePrinting(CPrintInfo* pInfo)
{
	// 默认准备
	return DoPreparePrinting(pInfo);
}

void CDrawingView::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: 打印前添加额外的初始化
}

void CDrawingView::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: 打印后添加清除过程
}


// CDrawingView 诊断

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

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

CDrawingDoc* CDrawingView::GetDocument() const // 非调试版本是内联的
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CDrawingDoc)));
	return (CDrawingDoc*)m_pDocument;
}
#endif //_DEBUG


// CDrawingView 消息处理程序

void CDrawingView::OnMouseMove(UINT nFlags, CPoint point)
{
	
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	//设置光标为自定义的光标
	SetCursor(m_hCursor);
	//正在拖动鼠标
	if(m_bDraw)
	{  
		//创建设备为本对象
		CClientDC m_pDC(this);
		//设置绘图模式，以屏幕的反转色为绘图颜色
		m_pDC.SetROP2(R2_NOT);
		//删除前一个WM_MOUSEMOVE画的直线
		m_pDC.MoveTo(m_pStart);
		m_pDC.LineTo(m_pEnd);
		//从起始位置到当前位置画一条新的直线
		m_pDC.MoveTo(m_pStart);
		m_pDC.LineTo(point);
		//存放直线的终点
		m_pEnd=point;

	}

	CView::OnMouseMove(nFlags, point);
}

void CDrawingView::OnLButtonDown(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	//存放鼠标光标的当前位置
	m_pEnd=point;
	//存放鼠标光标的起始位置
	m_pStart=point;
	//捕获鼠标
	SetCapture();
	//表示正在拖动鼠标
	m_bDraw=TRUE;
	//定义CRect对象
	CRect m_curRect;
	//获取视图窗口客户区的坐标
	GetClientRect(&m_curRect);
	//将客户区坐标转换为屏幕坐标
	ClientToScreen(&m_curRect);
	//将光标限定在视图窗口的客户区内
	ClipCursor(&m_curRect);

	CView::OnLButtonDown(nFlags, point);
}

void CDrawingView::OnLButtonUp(UINT nFlags, CPoint point)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	if(m_bDraw)
	{   //表示鼠标已释放
		m_bDraw=FALSE;
		//释放鼠标
		ReleaseCapture();
		//取消对光标的限定
		ClipCursor(NULL);
	}


	CView::OnLButtonUp(nFlags, point);
}

void CDrawingView::OnCut()
{
	// TODO: 在此添加命令处理程序代码
	 CWnd *pWnd=AfxGetApp()->GetMainWnd();

	CClientDC	dc(pWnd);
	CDC 		memDC;
	CRect		Rect;
	memDC.CreateCompatibleDC(&dc); 
	GetClientRect(&Rect);
    bitmap.CreateCompatibleBitmap(&dc, Rect.Width(),Rect.Height() );
	CBitmap* pOldBitmap = memDC.SelectObject(&bitmap);
	memDC.BitBlt(0,0, Rect.Width(),Rect.Height(), &dc, Rect.left,Rect.top, SRCCOPY); 
	pWnd->OpenClipboard() ;
	EmptyClipboard() ;
	SetClipboardData (CF_BITMAP, bitmap.GetSafeHandle() ) ;
	CloseClipboard () ;
	memDC.SelectObject(pOldBitmap);
	bitmap.Detach();
	//BitmapState=1;
	Invalidate();
}

void CDrawingView::OnTest()
{
	// TODO: 在此添加命令处理程序代码
	Invalidate();
}