Function flo_curves::bezier::features_for_cubic_bezier

pub fn features_for_cubic_bezier<Point: Coordinate + Coordinate2D>(
    w1: &Point, 
    w2: &Point, 
    w3: &Point, 
    w4: &Point, 
    accuracy: f64
) -> CurveFeatures

Determines the characteristics of a paritcular bezier curve: whether or not it is an arch, or changes directions (has inflection points), or self-intersects (has a loop)