mosaicdlg.cpp

一个国人自己实现图像库的程序（有参考价值）

// MosaicDlg.cpp : implementation file
//

#include "stdafx.h"
#include "picviewer.h"
#include "MosaicDlg.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMosaicDlg dialog


CMosaicDlg::CMosaicDlg(CWnd* pParent, FCDibEffect * dib)
	: CDialog(CMosaicDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMosaicDlg)
	//}}AFX_DATA_INIT
	m_pOriDib = dib ;
	m_Origin = *dib ;
	FCImage		bk ;
	bk.LoadJpeg (MAKEINTRESOURCE (JPG_BACKGROUND), _T("JPG")) ;
	m_BkBrush = ::CreatePatternBrush (bk.GetHandle ()) ;
	m_iMax = min (m_pOriDib->Width(), m_pOriDib->Height()) - 1 ;
}
CMosaicDlg::~CMosaicDlg ()
{
	::DeleteObject (m_BkBrush) ;
}


void CMosaicDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMosaicDlg)
	DDX_Control(pDX, IDS_PREVIEW, m_Preview);
	DDX_Control(pDX, IDC_SHOW_MOSAIC, m_staShow);
	DDX_Control(pDX, IDC_SCROLLBAR_MOSAIC, m_sbarMosaic);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMosaicDlg, CDialog)
	//{{AFX_MSG_MAP(CMosaicDlg)
	ON_WM_CTLCOLOR()
	ON_WM_HSCROLL()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMosaicDlg message handlers

void CMosaicDlg::OnOK() 
{
	// TODO: Add extra validation here
	m_pOriDib->Mosaic (m_sbarMosaic.GetScrollPos ()) ;
	CDialog::OnOK();
}

BOOL CMosaicDlg::OnInitDialog() 
{
	CDialog::OnInitDialog();

	// TODO: Add extra initialization here
	m_sbarMosaic.SetScrollRange (2, m_iMax, FALSE) ;
	m_sbarMosaic.SetScrollPos (5) ;
	m_staShow.SetWindowText (_T("5")) ;

	RECT	rc ;
	m_Preview.GetClientRect (&rc) ;
	m_Origin.Stretch (rc.right, rc.bottom) ;
	m_iMulti = m_pOriDib->Width() / m_Origin.Width() ;
	DWORD	style = m_Preview.GetStyle () ;
	style |= SS_BITMAP | SS_CENTERIMAGE ;
	::SetWindowLong (m_Preview.GetSafeHwnd(), GWL_STYLE, style) ;
	m_CurrDib = m_Origin ;
	m_CurrDib.Mosaic (max (2, 5/m_iMulti)) ;
	m_Preview.SetBitmap (m_CurrDib.GetHandle()) ;

	return FALSE;  // return TRUE unless you set the focus to a control
	              // EXCEPTION: OCX Property Pages should return FALSE
}

HBRUSH CMosaicDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) 
{
	HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
	
	// TODO: Change any attributes of the DC here
	if ((nCtlColor == CTLCOLOR_DLG) || (nCtlColor == CTLCOLOR_STATIC))
	{
		pDC->SetBkMode (TRANSPARENT) ;
		hbr = m_BkBrush ;
	}
	// TODO: Return a different brush if the default is not desired
	return hbr;
}

void CMosaicDlg::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar) 
{
	//	Get Current Position
	if ((nSBCode != SB_THUMBPOSITION) && (nSBCode != SB_THUMBTRACK))
		nPos = pScrollBar->GetScrollPos () ;
	switch (nSBCode)
	{
		case SB_LINELEFT  : nPos-- ; break ;
		case SB_LINERIGHT : nPos++ ; break ;
		case SB_PAGELEFT  : nPos -= 5 ; break ;
		case SB_PAGERIGHT :	nPos += 5 ; break ;
	}
	nPos = min (m_iMax, max (2, nPos)) ;
	CString		num ;
	num.Format ("%i", nPos) ;
	m_staShow.SetWindowText (num) ;

	m_CurrDib = m_Origin ;
	m_CurrDib.Mosaic (max (2, nPos/m_iMulti)) ;
	pScrollBar->SetScrollPos (nPos) ;
	m_Preview.SetBitmap (m_CurrDib.GetHandle()) ;
	m_Preview.InvalidateRect (NULL) ;

	CDialog::OnHScroll(nSBCode, nPos, pScrollBar);
}