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();
var time = i / (double)COUNT;
xyPoint.X = time;
xyPoint.Y = time * Math.Sin(2 * Math.PI * i / (double)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);
}
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);
}