/// <summary>
/// Same as <see cref="MakeDocument()"/>, only this method creates a document of the
/// given size input by <paramref name="size"/>.
/// </summary>
public virtual Document MakeDocument(int size)
{
LeftOver lvr = leftovr.Value;
if (lvr is null || lvr.DocData is null || lvr.DocData.Body is null ||
lvr.DocData.Body.Length == 0)
{
ResetLeftovers();
}
DocData docData = GetDocState().docData;
DocData dd = (lvr is null ? m_source.GetNextDocData(docData) : lvr.DocData);
int cnt = (lvr is null ? 0 : lvr.Count);
while (dd.Body is null || dd.Body.Length < size)
{
DocData dd2 = dd;
dd = m_source.GetNextDocData(new DocData());
cnt = 0;
dd.Body = (dd2.Body + dd.Body);
}
Document doc = CreateDocument(dd, size, cnt);
if (dd.Body is null || dd.Body.Length == 0)
{
ResetLeftovers();
}
void ComputeFFT()
{
if (FftQueue.Count > 0)
{
System.Numerics.Complex[] samples = new System.Numerics.Complex[NumberOfSamples];
int index = 0;
if (LeftOver != null)
{
int count = Math.Min(LeftOver.Length, NumberOfSamples);
for (; count > index; index++)
{
samples[index] = new System.Numerics.Complex(LeftOver[index], 0);
}
if (index + 1 == LeftOver.Length)
{
LeftOver = null;
}
else
{
LeftOver = LeftOver.Skip(index + 1).ToArray();
}
}
if (index + 1 < NumberOfSamples)
{
while (index + 1 < NumberOfSamples)
{
if (FftQueue.Count == 0)
{
break;
}
float[] array = FftQueue.Dequeue();
double[] hamming = Window.Hamming(array.Length);
array = array.Select((f, i) => (float)(hamming[i] * f)).ToArray();
int count = Math.Min(array.Length, NumberOfSamples - index);
for (int i = 0; count > i; i++)
{
samples[index] = new System.Numerics.Complex(array[i], 0);
index++;
}
if (array.Length > count)
{
int diff = array.Length - count;
LeftOver = array.Skip(count).ToArray();
}
}
}
FourierOptions options = FourierOptions.Matlab;
Fourier.Forward(samples, options);
FftFinished?.Invoke(this, new FourierEventArgs(samples, options));
}
}
