/***************************************************/
private static PolyCurve ExtendTangent(this PolyCurve curve, double start = 0.0, double end = 0.0, double tolerance = Tolerance.Distance)
{
if (-start > curve.Length() || -end > curve.Length()) //ExtendTangent allows to trim the curve but only to the limit of it's length.
{
Reflection.Compute.RecordError("Extension value too small");
return(null);
}
if (start < 0 && end < 0)
{
return(curve.Extend(start, end, false, tolerance));
}
if (start < 0 && !(end < 0))
{
curve = curve.Extend(start, 0, false, tolerance);
return(curve.ExtendTangent(0, end, tolerance));
}
if (!(start < 0) && end < 0)
{
curve = curve.Extend(0, end, false, tolerance);
return(curve.ExtendTangent(start, 0, tolerance));
}
List <ICurve> curves = curve.SubParts();
if (curves.Count == 1)
{
return new PolyCurve {
Curves = curves[0].IExtend(start, end, true, tolerance).ISubParts().ToList()
}
}
;
else
{
curves[0] = curves[0].IExtend(start, 0, true, tolerance);
curves[curves.Count - 1] = curves[curves.Count - 1].IExtend(0, end, true, tolerance);
return(new PolyCurve {
Curves = curves
});
}
}