public static void FilterData(ZedGraph.PointPairList data, ref ZedGraph.PointPairList filter, double speed_max, double alfa_max, double alfa_null, int periodInMin)
{
if (data != null)
{
if (filter == null || filter.Count < 2)
{
filter = new ZedGraph.PointPairList();
filter.Add(data[0]);
filter.Add(data[1]);
}
ZedGraph.PointPairList filterPoints = new ZedGraph.PointPairList();
for (int i = filter.Count; i < data.Count; i++)
{
filterPoints.Clear();
ZedGraph.PointPair notFilteredMeasure = data[i];
for (int j = filter.Count-1; j > 0 ; j--)
{
if (DateTime.FromOADate(notFilteredMeasure.X).Subtract(new TimeSpan(0, periodInMin, 0)) < DateTime.FromOADate(filter[j].X))
{
filterPoints.Add(filter[j]);
}
else
break;
}
double midX = filterPoints.Average(value => value.X);
double midY = filterPoints.Average(value => value.Y);
double alfa = 0.0;
double nominalSpeed = speed_max / 2.0;
//raschet skorosti
TimeSpan interval = DateTime.FromOADate(notFilteredMeasure.X) - DateTime.FromOADate(midX);
double speed = Math.Abs(notFilteredMeasure.Y - midY) / (0.5 * interval.TotalSeconds);
//alfa ot v
if (speed < nominalSpeed)
{
alfa = (alfa_max - alfa_null) * speed / nominalSpeed + alfa_null;
}
else if (speed >= nominalSpeed && speed < speed_max)
{
alfa = alfa_max;
}
else if (speed >= speed_max && speed < 2 * speed_max)
{
alfa = 2 - speed / speed_max;
}
else if (speed > 2 * speed_max)
{
alfa = 0;
}
//vichislenie skorrekt urovnia
double skor_uroven = notFilteredMeasure.Y * alfa + (1 - alfa) * midY;
//skor_uroven = Math.Round(skor_uroven, 2);
//vichislenie skorrekt urovnia
filter.Add(new ZedGraph.PointPair(notFilteredMeasure.X, skor_uroven));
}
if (filter.Count > 3)
{
filter[0].Y = filter[2].Y;
filter[1].Y = filter[2].Y;
}
}
}
