www.pudn.com > howtofft_src.zip > ChildView.cpp

// ChildView.cpp : implementation of the CChildView class 
// 
 
#include "stdafx.h" 
#include "FFTExample.h" 
#include "ChildView.h" 
#include "Fourier.h" 
 
#ifdef _DEBUG 
#define new DEBUG_NEW 
#endif 
 
 
// CChildView 
 
CChildView::CChildView() 
{ 
} 
 
CChildView::~CChildView() 
{ 
} 
 
 
BEGIN_MESSAGE_MAP(CChildView, CWnd) 
	ON_WM_PAINT() 
END_MESSAGE_MAP() 
 
 
 
// CChildView message handlers 
 
BOOL CChildView::PreCreateWindow(CREATESTRUCT& cs)  
{ 
	if (!CWnd::PreCreateWindow(cs)) 
		return FALSE; 
 
	cs.dwExStyle |= WS_EX_CLIENTEDGE; 
	cs.style &= ~WS_BORDER; 
	cs.lpszClass = AfxRegisterWndClass(CS_HREDRAW|CS_VREDRAW|CS_DBLCLKS,  
		::LoadCursor(NULL, IDC_ARROW), reinterpret_cast(COLOR_WINDOW+1), NULL); 
 
	return TRUE; 
} 
 
void CChildView::OnPaint()  
{ 
	CPaintDC dc(this); // device context for painting 
	 
	// TODO: Add your message handler code here 
 
	//Creates a CFourier object 
	//The CFourier class has the FFT function and a couple of usefull variables 
	CFourier fft; 
 
	//sample rate of the signal (must be 2^n) 
	long sample_rate=8192; 
 
	//number of samples you want to send for processing in the fft (any) 
	//for example 100 samples 
	long captured_samples=500; 
 
	//frequency of the signal (has to be smaller than sample_rate/2) 
	//for example 46 
	int frequency=250; 
 
	float data[5000]; 
 
 
	//example of a sin signal(you can try to add some more signals to see the 
	//fourier change 
 
	for(int i=0; i