CurveInterval
Creates a new instance of CurveInterval representing the interval of a curve. It calculates whether the interval is "flat," determines its parameter range, and sets the starting and ending positions of the interval on the curve.
Parameters
curve
the curve (Curve2) to which this interval belongs
tLo
the lower bound of the parametric range
tHi
the upper bound of the parametric range
pLo
the 2D point on the curve corresponding to tLo
pHi
the 2D point on the curve corresponding to tHi