/** This returns the times when the x or y derivative is 0 in the curve. */ std::vector<double> curve_mono_splits(Curve const &d) { Curve* deriv = d.derivative(); std::vector<double> rs = deriv->roots(0, X); append(rs, deriv->roots(0, Y)); delete deriv; std::sort(rs.begin(), rs.end()); return rs; }