public DoubleSeries GetFourierSeries(double amplitude, double phaseShift, int count = 5000)
{
var doubleSeries = new DoubleSeries();
for (int i = 0; i < count; i++)
{
var xyPoint = new XyPoint();
double time = 10 * i / (double)count;
double wn = 2 * Math.PI / (count / 10);
xyPoint.X = time;
xyPoint.Y = Math.PI *
amplitude *
(Math.Sin(i * wn + phaseShift) +
0.33 * Math.Sin(i * 3 * wn + phaseShift) +
0.20 * Math.Sin(i * 5 * wn + phaseShift) +
0.14 * Math.Sin(i * 7 * wn + phaseShift) +
0.11 * Math.Sin(i * 9 * wn + phaseShift) +
0.09 * Math.Sin(i * 11 * wn + phaseShift));
doubleSeries.Add(xyPoint);
}
return(doubleSeries);
}
public DoubleSeries GetDampedSinewave(int pad, double amplitude, double phase, double dampingFactor, int pointCount, int freq = 10)
{
var doubleSeries = new DoubleSeries();
for (int i = 0; i < pad; i++)
{
double time = 10 * i / (double)pointCount;
doubleSeries.Add(new XyPoint {
X = time
});
}
for (int i = pad, j = 0; i < pointCount; i++, j++)
{
var xyPoint = new XyPoint();
double time = 10 * i / (double)pointCount;
double wn = 2 * Math.PI / (pointCount / (double)freq);
xyPoint.X = time;
xyPoint.Y = amplitude * Math.Sin(j * wn + phase);
doubleSeries.Add(xyPoint);
amplitude *= 1.0 - dampingFactor;
}
return(doubleSeries);
}
public DoubleSeries GenerateEEG(int count, ref double startPhase, double phaseStep)
{
var doubleSeries = new DoubleSeries();
var rand = new Random((int)DateTime.Now.Ticks);
for (int i = 0; i < count; i++)
{
var xyPoint = new XyPoint();
double time = i / (double)count;
xyPoint.X = time;
//double mod = 0.2 * Math.Sin(startPhase);
xyPoint.Y = //mod * Math.Sin(startPhase / 4.9) +
0.05 * (rand.NextDouble() - 0.5) +
1.0;
doubleSeries.Add(xyPoint);
startPhase += phaseStep;
}
return(doubleSeries);
}
public DoubleSeries GetSquirlyWave()
{
var doubleSeries = new DoubleSeries();
var rand = new Random((int)DateTime.Now.Ticks);
const int COUNT = 1000;
for (int i = 0; i < COUNT; i++)
{
var xyPoint = new XyPoint();
double time = i / (double)COUNT;
xyPoint.X = time;
xyPoint.Y = time * Math.Sin(2 * Math.PI * i / COUNT) +
0.2 * Math.Sin(2 * Math.PI * i / (COUNT / 7.9)) +
0.05 * (rand.NextDouble() - 0.5) +
1.0;
doubleSeries.Add(xyPoint);
}
return(doubleSeries);
}
