public static IEnumerable <Point> GetSplinePointsConnectingAbsoluteFirstLastDataPoints(IList <DataPoint> dataPoints, double scaleFactor)
{
DataPoint firstPoint = dataPoints[0];
DataPoint lastPoint = dataPoints[dataPoints.Count - 1];
if (firstPoint.isEmpty || double.IsNaN(firstPoint.CenterX()) || double.IsNaN(firstPoint.CenterY()) ||
lastPoint.isEmpty || double.IsNaN(lastPoint.CenterX()) || double.IsNaN(lastPoint.CenterY()))
{
yield break;
}
double tolerance = DefaultTolerance;
if (scaleFactor > 2)
{
tolerance *= (int)scaleFactor / 2;
}
DataPoint previousSignificantPointBeforeAbsoluteLast = FindPreviousNonEmptyPointBeforeAbsoluteLast(dataPoints);
DataPoint nextSignificantPointAfterAbsoluteFirst = FindNextNonEmptyPointAfterAbsoluteFirst(dataPoints);
// return the first point since spline segmentation skips it
yield return(lastPoint.Center());
foreach (Point point in Segment(previousSignificantPointBeforeAbsoluteLast.Center(), lastPoint.Center(), firstPoint.Center(), nextSignificantPointAfterAbsoluteFirst.Center(), tolerance))
{
yield return(point);
}
}