protected override void BindCore()
{
BollingerBandsIndicator indicator = this.Owner as BollingerBandsIndicator;
int period = this.Period;
double deviations = this.StandardDeviations;
SizedQueue currentItems = new SizedQueue(period);
int currentIndex = 0;
double stdDeviation = 0;
foreach (var item in this.itemsSource)
{
object val = this.ValueBinding.GetValue(item);
currentItems.EnqueueItem((double)val);
double currentAverage = MovingAverageIndicatorDataSource.CalculateCurrentValue(currentItems);
// TODO: Nested loop, possible performance degrade for large data
stdDeviation = CalculateStandardDeviation(currentItems, currentAverage);
CategoricalDataPoint point, secondPoint;
if (indicator.Model.DataPointsInternal.Count > currentIndex)
{
point = this.Owner.Model.DataPointsInternal[currentIndex] as CategoricalDataPoint;
point.Value = currentAverage + (deviations * stdDeviation);
secondPoint = indicator.lowerBandModel.DataPointsInternal[currentIndex] as CategoricalDataPoint;
secondPoint.Value = currentAverage - (deviations * stdDeviation);
}
else
{
point = this.GenerateDataPoint(item, -1) as CategoricalDataPoint;
point.Value = currentAverage + (deviations * stdDeviation);
indicator.model.DataPointsInternal.Add(point);
secondPoint = this.GenerateDataPoint(item, -1) as CategoricalDataPoint;
secondPoint.Value = currentAverage - (deviations * stdDeviation);
indicator.lowerBandModel.DataPointsInternal.Add(secondPoint);
}
currentIndex++;
}
}
private static void OnLowerBandStrokeChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BollingerBandsIndicator indicator = d as BollingerBandsIndicator;
indicator.lowerBandRenderer.strokeShape.Stroke = e.NewValue as Brush;
}
private static void OnStandardDeviationsChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
BollingerBandsIndicator presenter = d as BollingerBandsIndicator;
(presenter.dataSource as BollingerBandsIndicatorDataSource).StandardDeviations = (int)e.NewValue;
}
