/// <summary></summary>
private void Butterfly(Sample *ps, Sample *pu, Sample *oj, Sample *ok)
{
_smpT->Real = pu->Real * ok->Real - pu->Imag * ok->Imag;
_smpT->Imag = pu->Imag * ok->Real + pu->Real * ok->Imag;
ok->Real = oj->Real - _smpT->Real;
oj->Real += _smpT->Real;
ok->Imag = oj->Imag - _smpT->Imag;
oj->Imag += _smpT->Imag;
_dTemp = ps->Real * pu->Real + ps->Imag * pu->Imag;
pu->Imag += ps->Imag * pu->Real - ps->Real * pu->Imag;
pu->Real -= _dTemp;
}
public Fourier()
{
_smpS = Alloc(sizeof(Sample));
_smpT = Alloc(sizeof(Sample));
_smpU = Alloc(sizeof(Sample));
// set defaults
_bUnknownSize = true;
_smpValues = new Sample[0];
_dPi = 4 * Math.Atan(1);
_dTwoPi = _dPi + _dPi;
_bProcess = true;
}
/// <summary></summary>
private void Free(Sample *pmem)
{
HeapFree(GetProcessHeap(), 0, pmem);
}
private static extern bool HeapFree(IntPtr hHeap, uint dwFlags, Sample *lpMem);
