第七章7.txt

本书在复习C++基础知识后

void CEx_A7View::OnDraw(CDC* pDC)
{	…
		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;
}