void CalcTrendLine(List <Rate> range, double pointSize, BarsPeriodType period)
{
if (range.Count == 0)
{
return;
}
var minutes = (range.Last().StartDate - range[0].StartDate).Duration().TotalMinutes;
Func <TimeSpan, IEnumerable <double> > groupped = ts => range.GroupedDistinct(rate => rate.StartDate.AddMilliseconds(-rate.StartDate.Millisecond), g => g.Average(rate => rate.PriceAvg));
var doubles = period == BarsPeriodType.t1 ? groupped(1.FromSeconds()).ToArray() : range.Select(r => r.PriceAvg).ToArray();
if (doubles.Length < 2 && range.Count > 1)
{
doubles = groupped(1.FromSeconds()).ToArray();
}
var coeffs = doubles.Linear();
this.Slope = coeffs.LineSlope();
this.Angle = Slope.Angle(period == BarsPeriodType.t1 ? 1.0 / 60 : (int)period, pointSize);
this.StDev = doubles.StDevByRegressoin(coeffs) / pointSize;
this.InterseptStart = coeffs.RegressionValue(0);
this.InterseptEnd = coeffs.RegressionValue(doubles.Length - 1);
this.DistanceByRegression = DistanceByHeightAndAngle(InterseptStart.Abs(InterseptEnd), Angle).Abs() / pointSize;
}
