// TODO - We should convert many methods to properties such as getValue(), WidthInPoints() etc.
public static Integrator.PartitionRectangle ComputeIntegral(AggregationTimeSeries timeSeries, BinBoundaries bin)
{
var pointsInBin = PointsInBin(timeSeries, bin, BoundaryPointHandling.IsWeightedComputation);
// Replaced Duration class by TimeSpan class.
// Duration describes a type that holds a time interval, which is an elapsed time between two time points.
var binLengthMinusGaps = TimeSpan.Zero;
Func <Point, Point, double> trapezoidalArea = (Point firstPoint, Point secondPoint) =>
{
var averageRectangle = MeanRectangleBetweenPoints(firstPoint, secondPoint);
binLengthMinusGaps += averageRectangle.BaseLength; // Used += operator instead of =
return(averageRectangle.Area());
};
// TODO - We need to find c# equivalent for Duration.Epsilon
if (bin.WidthAsDuration <= Duration.Epsilon)
{
// IsEmptyValue checks first item in pointsInBin for empty.
// TODO - Should we check pointsInBin for null? What if, PointsInBin method returns null instead of empty collection.
if (bin.WidthInPoints == 0 || pointsInBin.Count == 0 || AggregationConstants.IsEmptyValue(pointsInBin.First().Value))
{
return(new Integrator.PartitionRectangle()
{
MeanValue = AggregationConstants.EmptyValue(), BaseLength = TimeSpan.Zero
});
}
return(new Integrator.PartitionRectangle()
{
MeanValue = pointsInBin.First().Value, BaseLength = bin.WidthAsDuration
});
}
// Replaced std::inner_product with Zip operator.
// std::inner_product - Computes cumulative inner product of range.
// Replaced std::plus with Sum operator.
var count = pointsInBin.Count();
var integral = pointsInBin.Take(count - 1).Zip(x => pointsInBin.TakeLast(count - 1), trapezoidalArea).Sum();
if (binLengthMinusGaps.Ticks == 0)
{
return(new Integrator.PartitionRectangle()
{
MeanValue = AggregationConstants.EmptyValue(), BaseLength = TimeSpan.Zero
});
}
return(new Integrator.PartitionRectangle()
{
MeanValue = integral / binLengthMinusGaps.Ticks, BaseLength = binLengthMinusGaps
});
}
// Placeholder method
public static IEnumerable <Point> PointsInBin(AggregationTimeSeries timeSeries, BinBoundaries bin, bool isWeightedComputation)
{
return(new List <Point>());
}
