histogramdialog.cpp

电脑编程技巧和源码。很不错的。

// HistogramDialog.cpp : implementation file
//

#include "stdafx.h"
#include "Test.h"
#include "HistogramDialog.h"
#include "dib.h"

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

/////////////////////////////////////////////////////////////////////////////
// CHistogramDialog dialog


CHistogramDialog::CHistogramDialog(CDib* pDib, CWnd* pParent /*=NULL*/)
	: CDialog(CHistogramDialog::IDD, pParent)
{
	//{{AFX_DATA_INIT(CHistogramDialog)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	m_pHistogram = pDib->m_naHistogram;
	m_nMaxCount  = pDib->m_nMaxCount;
}


void CHistogramDialog::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CHistogramDialog)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}


BEGIN_MESSAGE_MAP(CHistogramDialog, CDialog)
	//{{AFX_MSG_MAP(CHistogramDialog)
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CHistogramDialog message handlers

void CHistogramDialog::OnPaint() 
{
	CPaintDC	dc(this); // device context for painting
	CRect		rect;
	CWnd*		pWnd;
	int			i, j;

	pWnd = GetDlgItem( IDC_HISTOGRAM );
	pWnd->GetWindowRect( &rect );
	ScreenToClient( &rect );
	pWnd->Invalidate();
	pWnd->UpdateWindow();
	dc.Rectangle( &rect );
	rect.DeflateRect( 1, 1 );
	for( i=0; i<256; i++ )
	{
		dc.MoveTo( rect.left + i, rect.bottom );
		dc.LineTo( rect.left + i, rect.bottom-(rect.bottom-rect.top)*m_pHistogram[i]/m_nMaxCount );
	}

	pWnd = GetDlgItem( IDC_GRAYLEVEL );
	pWnd->GetWindowRect( &rect );
	ScreenToClient( &rect );
	pWnd->Invalidate();
	pWnd->UpdateWindow();
	dc.Rectangle( &rect );
	rect.DeflateRect( 1, 1 );
	for( i=0; i<256; i++ )
		for( j=rect.top; j<rect.bottom; j++ )
		{
			dc.SetPixel( rect.left+i, j, RGB(i,i,i) );
		}

	// Do not call CDialog::OnPaint() for painting messages
}