PK_CURVE_approx_t    


typedef int PK_CURVE_approx_t;


Curve approximation type.

    PK_CURVE_approx_arclength_c     Approximating curve has arc
                                    length parameterisation.
    PK_CURVE_approx_even_c          Approximating curve has even
                                    parameterisation.

Even parametrisation means that arc length to parameter range ratio
is constant along the curve.

Arc length parametrisation ensures that arc length to parameter range
ratio is 1.