public SampleAggregator(int fftLength)
{
if (!IsPowerOfTwo(fftLength))
{
throw new ArgumentException("FFT Length must be a power of two");
}
this.m = (int)Math.Log(fftLength, 2.0);
this.fftLength = fftLength;
this.fftBuffer = new Complex[fftLength];
this.fftArgs = new FftEventArgs(fftBuffer);
}
private void FftCalculated(object sender, FftEventArgs e)
{
Graphics gr = Graphics.FromImage(bitmap);
int halfPlot = e.Result.Length / 2;
for (int i = 0; i < halfPlot; i++)
{
double mX = e.Result[i].X;
double mY = e.Result[i].Y;
double magnitude = Math.Sqrt(mX * mX + mY * mY);
float dbs = 20 * (float)Math.Log(magnitude, 10);
float wM = map(i, 0, halfPlot, 0, picW);
gr.FillRectangle(SystemBrushes.Control, wM - 1, 0, 2, picH);
if (dbs > -90f)
{
if (dbs < maxDb)
{
maxDb = dbs;
}
if (dbs > minDb)
{
minDb = dbs;
}
serial_buffer[(int)map(i, 0, halfPlot, 0, config.cols)] = (byte)map(dbs, maxDb, minDb, 0, config.rows);
var y = map(dbs, minDb, maxDb, 0, picH);
var height = picH - y;
gr.FillRectangle(Brushes.Black, wM - 1, y, 2, height);
}
}
pictureBox1.Image = bitmap;
}