public static double GetYValue(this SortedSet <FunctionPoint> function, int xValue)
{
var yValue = function.FirstOrDefault(e => e.X == xValue).Y;
if (!function.Any(e => e.X == xValue))
{
var leftPoint = function.GetViewBetween(new FunctionPoint(double.NegativeInfinity), new FunctionPoint(xValue)).Max;
var rightPoint = function.GetViewBetween(new FunctionPoint(xValue), new FunctionPoint(double.PositiveInfinity)).Min;
yValue = FunctionPoint.Interplate(leftPoint, rightPoint, xValue);
}
return(yValue);
}
public static int GetXValue(this SortedSet <FunctionPoint> function, double yValue)
{
var sortedSet = new SortedSet <FunctionPoint>(function.Select(e => new FunctionPoint(e.Y, e.X)));
var xValue = (int)function.FirstOrDefault(e => e.Y == yValue).X;
if (!function.Any(e => e.Y == yValue))
{
var leftPoint = sortedSet.GetViewBetween(new FunctionPoint(double.NegativeInfinity), new FunctionPoint(yValue)).Max;
var rightPoint = sortedSet.GetViewBetween(new FunctionPoint(yValue), new FunctionPoint(double.PositiveInfinity)).Min;
xValue = (int)Math.Round(FunctionPoint.Interplate(leftPoint, rightPoint, yValue), MidpointRounding.ToEven);
}
return(xValue);
}
