Function parameter_at_length 

pub fn parameter_at_length(
    curve: &Curve,
    range: (f64, f64),
    target: f64,
    tol: Tolerances,
) -> OgeomResult<f64>

The parameter at which a given arc length from the start of range is reached.

The inverse of curve_length. target is measured from range.0, and must lie between zero and the curve’s total length over the range; asking for a point beyond the end is refused rather than clamped, because a clamped answer is indistinguishable from a correct one at the end.

Errors

OgeomError::Domain if target is negative or past the end; OgeomError::NotDone if the solve does not converge.