Method extract_keys

src/views/scatter.rs:131–143

Extract the list of keys to use when stacking and coloring the bars.

(data: &Vec<impl PointDatum<T, U>>)

    /// Extract the list of keys to use when stacking and coloring the bars.
    fn extract_keys(data: &Vec<impl PointDatum<T, U>>) -> Vec<String> {
        let mut keys = Vec::new();
        let mut map = HashMap::new();

        for datum in data.iter() {
            match map.insert(datum.get_key(), 0) {
                Some(_) => {},
                None => keys.push(datum.get_key()),
            }
        }

        keys
    }

}