public void NewSample(float sample)
{
var radFreq = ++i * Math.PI * 2 / Size;
var realList = realData.Advance(); // The datapoint that will be changed.
var imaginaryList = imaginaryData.Advance(); // By the end of this method, these lists will contain data for the newest sample.
for (int k = 0; k < DFTSize; ++k) //Runs through all frequencies. f = samplerate/(2*DFTSize)*k
{
real[k] -= realList[k]; // Subtracts the now disappearing data.
realList[k] = (float)(sample * Math.Cos(k * radFreq)); // Replaces the disappearing data with data from the new sample.
real[k] += realList[k]; // Adds the data from the new sample.
imaginary[k] -= imaginaryList[k];
imaginaryList[k] = (float)(sample * -Math.Sin(k * radFreq));
imaginary[k] += imaginaryList[k];
}
}