myfftdlg.cpp

FFT和IFFT的轉換

// myfftDlg.cpp : implementation file
//

#include "stdafx.h"
#include "myfft.h"
#include "myfftDlg.h"
#include "fft_ifft.h"

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

/////////////////////////////////////////////////////////////////////////////
// CMyfftDlg dialog

CMyfftDlg::CMyfftDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMyfftDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMyfftDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

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

BEGIN_MESSAGE_MAP(CMyfftDlg, CDialog)
	//{{AFX_MSG_MAP(CMyfftDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_BN_CLICKED(IDC_BUTTON1, OnButton1)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyfftDlg message handlers

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

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMyfftDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMyfftDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

//Wave file is signed 16-bits can use this fft and ifft
//N_ARRAY and input samples must be 2^N, if input samples
//not 2^N you can stuff 0 in the tail of array
void CMyfftDlg::OnButton1()
{
	// TODO: Add your control notification handler code here
	CFastFourier* p_myFourier = new CFastFourier();

	double	xreal[N_ARRAY] = {0}, ximag[N_ARRAY] = {0}; 
	double	yreal[N_ARRAY] = {0}, yimag[N_ARRAY] = {0}; 
	double	zreal[N_ARRAY] = {0}, zimag[N_ARRAY] = {0};
				
	xreal[0]	=  1.0f;
	xreal[1]	=  2.0f;
	xreal[2]	=  3.0f;
	xreal[3]	=  4.0f;
	
	yreal[0]	=  1.0f;
	yreal[1]	=  2.0f;
	yreal[2]	=  3.0f;
	yreal[3]	=  4.0f;
			
	p_myFourier->fft_conv( xreal, ximag, yreal, yimag, zreal, zimag, 8 );
	p_myFourier->roundoff( zreal, 8 );
		
	delete p_myFourier;
	p_myFourier = NULL;
}