Function ellipse 

pub fn ellipse(
    center: &GeoCoord,
    semi_major_m: f64,
    semi_minor_m: f64,
    rotation_deg: f64,
    segments: usize,
) -> Vec<GeoCoord>

Generate an ellipse as a closed polygon ring.

Arguments

• center – centre of the ellipse.
• semi_major_m – semi-major axis in meters (along rotation).
• semi_minor_m – semi-minor axis in meters (perpendicular).
• rotation_deg – rotation of the semi-major axis in degrees clockwise from north.
• segments – number of segments (clamped to min 4).