public PointDouble GetPointAtLength(double length)
{
if (!length.IsFinite())
{
throw new ArgumentException("length is not finite");
}
if (this.points.Count == 0)
{
return(PointDouble.NaN);
}
if (length < 0.0)
{
return(this.points[0]);
}
if (length >= this.length)
{
return(this.points[this.points.Count - 1]);
}
int num = ListUtil.BinarySearch <double, SegmentedListStruct <double>, DefaultComparerStruct <double> >(this.lengthAtPoint.AsStruct <double>(), length, new DefaultComparerStruct <double>());
if (num >= 0)
{
return(this.points[num]);
}
int num2 = ~num;
if (num2 == this.lengthAtPoint.Count)
{
return(this.points[this.points.Count - 1]);
}
int num3 = num2 - 1;
PointDouble num4 = this.points[num3];
PointDouble num5 = this.points[num2];
double num6 = this.lengthAtPoint[num3];
double num7 = this.lengthAtPoint[num2];
if (num6 == num7)
{
return(num4);
}
double num8 = (length - num6) / (num7 - num6);
double num9 = 1.0 - num8;
return(new PointDouble((num4.X * num9) + (num5.X * num8), (num4.Y * num9) + (num5.Y * num8)));
}