smoothavg.cpp

一个国人自己实现图像库的程序（有参考价值）

// SmoothAVG.cpp : implementation file
//

#include "stdafx.h"
#include "picviewer.h"
#include "SmoothAVG.h"

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

/////////////////////////////////////////////////////////////////////////////
// CSmoothAVG dialog


CSmoothAVG::CSmoothAVG(CWnd* pParent, FCDibEffect * dib)
	: CDialog(CSmoothAVG::IDD, pParent)
{
	//{{AFX_DATA_INIT(CSmoothAVG)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	m_pOriDib = dib ;
	m_Origin = *dib ;
	m_iBlkMax = min (dib->Height(), dib->Width()) - 1 ;
	FCImage		bk ;
	bk.LoadJpeg (MAKEINTRESOURCE (JPG_BACKGROUND), _T("JPG")) ;
	m_BkBrush = ::CreatePatternBrush (bk.GetHandle ()) ;
}
CSmoothAVG::~CSmoothAVG ()
{
	::DeleteObject (m_BkBrush) ;
}


void CSmoothAVG::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CSmoothAVG)
	DDX_Control(pDX, IDS_PREVIEW, m_Preview);
	DDX_Control(pDX, IDC_SHOW_SMOOTH, m_staShow);
	DDX_Control(pDX, IDC_SCROLLBAR_SMOOTH, m_sbarSmooth);
	//}}AFX_DATA_MAP
}

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

/////////////////////////////////////////////////////////////////////////////
// CSmoothAVG message handlers

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

	// TODO: Add extra initialization here
	m_sbarSmooth.SetScrollRange (2, m_iBlkMax, FALSE) ;
	m_sbarSmooth.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.m_hWnd, GWL_STYLE, style) ;
	m_CurrDib = m_Origin ;
	m_CurrDib.SmoothAverage (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
}

void CSmoothAVG::OnOK() 
{
	// TODO: Add extra validation here
	m_pOriDib->SmoothAverage (m_sbarSmooth.GetScrollPos ()) ;
	CDialog::OnOK();
}

HBRUSH CSmoothAVG::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 CSmoothAVG::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 = max (2, min (m_iBlkMax, nPos)) ;
	CString		num ;
	num.Format ("%i", nPos) ;
	m_staShow.SetWindowText (num) ;

	m_CurrDib = m_Origin ;
	m_CurrDib.SmoothAverage (min (min (m_CurrDib.Height(), m_CurrDib.Width()) - 1, max (2, nPos/m_iMulti))) ;
	pScrollBar->SetScrollPos (nPos) ;
	m_Preview.SetBitmap (m_CurrDib.GetHandle()) ;
	m_Preview.InvalidateRect (NULL) ;

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