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Trait geo::GeoFloat[−][src]

pub trait GeoFloat: Float + GeoNum { }
Expand description

A common numeric trait used for geo algorithms.

Different numeric types have different tradeoffs. geo strives to utilize generics to allow users to choose their numeric types. If you are writing a function which you’d like to be generic over all the numeric types supported by geo, you probably want to constraint your function input to GeoFloat. For methods which work for integers, and not just floating point, see GeoNum.

Examples

use geo::{GeoFloat, MultiPolygon, Polygon, Point};

// An admittedly silly method implementation, but the signature shows how to use the GeoFloat trait
fn farthest_from<'a, T: GeoFloat>(point: &Point<T>, polygons: &'a MultiPolygon<T>) -> Option<&'a Polygon<T>> {
    polygons.iter().fold(None, |accum, next| {
        match accum {
            None => Some(next),
            Some(farthest) => {
                use geo::algorithm::{euclidean_distance::EuclideanDistance};
                if next.euclidean_distance(point) > farthest.euclidean_distance(point) {
                    Some(next)
                } else {
                    Some(farthest)
                }
            }
        }
    })
}

Implementors