ex_a7view.cpp

Visual C++应用教程-源代码 本书在复习C++基础知识后

// Ex_A7View.cpp : implementation of the CEx_A7View class
//

#include "stdafx.h"
#include "Ex_A7.h"

#include "Ex_A7Doc.h"
#include "Ex_A7View.h"
#include "math.h"

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

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View

IMPLEMENT_DYNCREATE(CEx_A7View, CView)

BEGIN_MESSAGE_MAP(CEx_A7View, CView)
	//{{AFX_MSG_MAP(CEx_A7View)
	ON_WM_MOUSEMOVE()
	ON_WM_SETCURSOR()
	ON_WM_LBUTTONDOWN()
	ON_WM_KEYDOWN()
	//}}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()

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View construction/destruction

CEx_A7View::CEx_A7View()
{
	m_oldBmp	= NULL;
}

CEx_A7View::~CEx_A7View()
{
}

BOOL CEx_A7View::PreCreateWindow(CREATESTRUCT& cs)
{
	// TODO: Modify the Window class or styles here by modifying
	//  the CREATESTRUCT cs

	return CView::PreCreateWindow(cs);
}

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View drawing

void CEx_A7View::OnDraw(CDC* pDC)
{
	CEx_A7Doc* pDoc = GetDocument();
	ASSERT_VALID(pDoc);
	// TODO: add draw code for native data here
	CRect rcClient;
	GetClientRect( rcClient );						// 获取客户区大小

	// 清除内存
	if (m_oldBmp) m_dcMem.SelectObject( m_oldBmp );	// 恢复原来位图
	m_dcMem.DeleteDC();
	m_dcMem.CreateCompatibleDC( pDC );				// 用视图设备参数重建内存环境

	CBitmap bmp;
	bmp.CreateCompatibleBitmap( pDC,  rcClient.Width(), rcClient.Height() );
	m_oldBmp = m_dcMem.SelectObject( &bmp );		// 通过选入位图构造实际内存环境
	bmp.DeleteObject();

	m_dcMem.FillSolidRect( rcClient, RGB(0,0,0) );
	int nBkMode = m_dcMem.SetBkMode( TRANSPARENT ); // 设置透明背景模式 

	CPen	pen( PS_SOLID, 3, RGB( 0, 192, 0 ) );
	CPen	*oldPen = m_dcMem.SelectObject( &pen );
	for ( int i = 0; i < m_strCmdArray.GetSize(); i++ )
	{
		CString str = (CString)m_strCmdArray[i];
		// 解析命令
		CString	strCmd;
		int nIndex	= str.Find(",");
		strCmd		= str.Left( nIndex  );	
		strCmd.TrimLeft();	strCmd.TrimRight();
		CString strData = str.Mid( nIndex + 1 );
		int x,y;
		nIndex		= strData.Find(",");
		x			= atol( strData.Left( nIndex ) );
		y			= atol( strData.Mid( nIndex + 1 ) );

		if ( strCmd == "MOVETO" )	m_dcMem.MoveTo( x, y );
		if ( strCmd == "LINETO" )	m_dcMem.LineTo( x, y );
	}
	m_dcMem.SelectObject( oldPen );

	pDC->BitBlt( 0, 0, rcClient.Width(), rcClient.Height(),	&m_dcMem, 0, 0, SRCCOPY );
	m_dcMem.SetBkMode( nBkMode );
	m_bCursorFirst	= TRUE;
}

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View printing

BOOL CEx_A7View::OnPreparePrinting(CPrintInfo* pInfo)
{
	// default preparation
	return DoPreparePrinting(pInfo);
}

void CEx_A7View::OnBeginPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add extra initialization before printing
}

void CEx_A7View::OnEndPrinting(CDC* /*pDC*/, CPrintInfo* /*pInfo*/)
{
	// TODO: add cleanup after printing
}

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View diagnostics

#ifdef _DEBUG
void CEx_A7View::AssertValid() const
{
	CView::AssertValid();
}

void CEx_A7View::Dump(CDumpContext& dc) const
{
	CView::Dump(dc);
}

CEx_A7Doc* CEx_A7View::GetDocument() // non-debug version is inline
{
	ASSERT(m_pDocument->IsKindOf(RUNTIME_CLASS(CEx_A7Doc)));
	return (CEx_A7Doc*)m_pDocument;
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CEx_A7View message handlers

void CEx_A7View::DrawCursor(CDC *pDC, CPoint pt)
{
	CRect	rcClip;
	pDC->GetClipBox( rcClip );							// 当前裁剪区大小
	CPen	pen( PS_SOLID, 1, RGB( 128, 128, 128 ) );	// 灰色画笔
	CPen	*oldPen = pDC->SelectObject( &pen );		// 选入画笔
	// 设置XOR光栅操作模式
	int nOldROP	= pDC->SetROP2( R2_XORPEN );			
	// 绘制水平线
	pDC->MoveTo( rcClip.left, pt.y );	pDC->LineTo( rcClip.right, pt.y );
	//绘制垂直线
	pDC->MoveTo( pt.x, rcClip.top );	pDC->LineTo( pt.x, rcClip.bottom );
	// 恢复原来的光栅模式
	pDC->SetROP2( nOldROP );							
	// 恢复原来的画笔
	pDC->SelectObject( oldPen );
}

void CEx_A7View::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	CDC* pDC		= this->GetDC();
	CString			strPos;
	if (m_bLineStart )
	{
		// 计算长度和角度
		int dx = point.x - m_ptPrevPos.x;
		int dy = point.y - m_ptPrevPos.y;
		double length	= sqrt( dx * dx + dy * dy );
		double angle;
		if (dx == 0 )		angle = 90.0;
		else if ( dy == 0 ) angle = 0.0;
		else				angle = 180.0 * atan( (double)dy / (double)dx ) / 3.14159265;
		strPos.Format( "%.1f<%.1f", length, angle );
	} else
		strPos.Format( "%d, %d", point.x, point.y );
	if ( m_bCursorFirst )
	{
		m_bCursorFirst	= FALSE;
		m_ptCurPos		= point;
		DrawCursor( pDC, m_ptCurPos );
		DrawInfoWnd( pDC, m_ptCurPos, strPos );
	} else
	{
		DrawCursor( pDC, m_ptCurPos );
		if (m_bLineStart )				// 绘制XOR直线 
			DrawXORLine( pDC, m_ptPrevPos, m_ptCurPos );
		if ( m_dcMem.m_hDC )
		{
			pDC->BitBlt( m_ptCurPos.x, m_ptCurPos.y - 15, 80, 15, 
				&m_dcMem, m_ptCurPos.x, m_ptCurPos.y - 15, SRCCOPY );
		}
		m_ptCurPos		= point;
		if (m_bLineStart )				// 绘制XOR直线 
			DrawXORLine( pDC, m_ptPrevPos, m_ptCurPos );
		DrawCursor( pDC, m_ptCurPos );
		DrawInfoWnd( pDC, m_ptCurPos, strPos );
	}
	
	CView::OnMouseMove(nFlags, point);
}

BOOL CEx_A7View::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	// TODO: Add your message handler code here and/or call default
	SetCursor( NULL );
	
	return TRUE;//CView::OnSetCursor(pWnd, nHitTest, message);
}

void CEx_A7View::DrawInfoWnd(CDC *pDC, CPoint pt, CString strInfo)
{
	CRect rcWnd( pt.x, pt.y -  15, pt.x + 80, pt.y );
	pDC->FillSolidRect( rcWnd, RGB( 0, 0, 128 ) );
	pDC->Draw3dRect( rcWnd, RGB(255,255,255), RGB(255,255,255) );

	// 定义并设置文本字体
	LOGFONT	lfText;
	memset(&lfText, 0, sizeof(LOGFONT));
	lfText.lfHeight		= -12;	
	lfText.lfCharSet	= GB2312_CHARSET;
	strcpy(lfText.lfFaceName, "宋体");	
	CFont		cf;	
	cf.CreateFontIndirect(&lfText); 
	CFont *oldFont	= pDC->SelectObject( &cf );

	pDC->SetBkColor( RGB( 0, 0, 128 ) );
	pDC->SetTextColor( RGB( 192, 192, 0 ) );
	pDC->DrawText( strInfo, rcWnd, DT_CENTER | DT_VCENTER | DT_SINGLELINE );

	pDC->SelectObject( oldFont );
	cf.DeleteObject();					// 删除字体对象
}

void CEx_A7View::OnInitialUpdate() 
{
	CView::OnInitialUpdate();
	
	// TODO: Add your specialized code here and/or call the base class
	m_strCmdArray.RemoveAll();			// 清空命令
	m_bLineStart	= FALSE;			
	
}

void CEx_A7View::DrawPointFlag(CDC *pDC, CPoint pt)
{
	CPen	*oldPen = (CPen *)pDC->SelectStockObject( WHITE_PEN );	// 选入白色系统画笔
	// 绘制水平线
	pDC->MoveTo( pt.x - 4, pt.y );	pDC->LineTo( pt.x + 4, pt.y );
	//绘制垂直线
	pDC->MoveTo( pt.x, pt.y - 4 );	pDC->LineTo( pt.x, pt.y + 4 );
	// 恢复原来的画笔
	pDC->SelectObject( oldPen );
}

void CEx_A7View::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	m_ptPrevPos		= point;
	if ( !m_bLineStart )
	{
		m_bLineStart	= TRUE;

		// 创建并添加命令
		CString		strCmd;
		strCmd.Format( "MOVETO,%d,%d", point.x, point.y );
		m_strCmdArray.Add( strCmd );
	} else
	{
		CString		strCmd;
		strCmd.Format( "LINETO,%d,%d", point.x, point.y );
		m_strCmdArray.Add( strCmd );
	}
	DrawCursor( GetDC(), point );
	DrawPointFlag( GetDC(), point );
	DrawCursor( GetDC(), point );
	DrawPointFlag( &m_dcMem, point );
	
	CView::OnLButtonDown(nFlags, point);
}

void CEx_A7View::OnKeyDown(UINT nChar, UINT nRepCnt, UINT nFlags) 
{
	// TODO: Add your message handler code here and/or call default
	if ( nChar == VK_ESCAPE )
	{
		if ( m_bLineStart )
		{
			m_bLineStart	= FALSE;
			Invalidate();					// 强制更新视图
		}
	}
	
	CView::OnKeyDown(nChar, nRepCnt, nFlags);
}

void CEx_A7View::DrawXORLine(CDC *pDC, CPoint pt1, CPoint pt2)
{
	CPen	pen( PS_SOLID, 1, RGB( 192, 192, 128 ) );	// 淡黄色画笔
	CPen	*oldPen = pDC->SelectObject( &pen );		// 选入画笔
	int nOldROP	= pDC->SetROP2( R2_XORPEN );			
	pDC->MoveTo( pt1 );	pDC->LineTo( pt2 );
	pDC->SetROP2( nOldROP );							
	pDC->SelectObject( oldPen );
}