public virtual int GetPointIndexForDisplayValues(double xValueInDisplayUnit, double yValueInDisplayUnit)
{
var xBaseUnit = XAxis.ConvertToBaseUnit(xValueInDisplayUnit);
var yBaseUnit = YAxis.ConvertToBaseUnit(yValueInDisplayUnit);
return(_xyValues.OrderBy(x => x.DistanceTo(xBaseUnit, yBaseUnit)).First().Index);
}
