Struct XtEnu 

pub struct XtEnu {
    pub origin: LngLat,
}

East-North-Up (ENU) planar projection distance calculation.

Projects coordinates to a local East-North-Up coordinate system around the specified origin point, then calculates Euclidean distance. This provides better performance than great circle calculations while maintaining reasonable accuracy for regional datasets.

Examples

use rapidgeo_distance::LngLat;
use rapidgeo_simplify::xt::{PerpDistance, XtEnu};

let origin = LngLat::new_deg(-121.5, 37.0); // Midpoint
let backend = XtEnu { origin };

let distance = backend.d_perp_m(
    LngLat::new_deg(-122.0, 37.0),
    LngLat::new_deg(-121.0, 37.0),
    LngLat::new_deg(-121.5, 37.1), // 0.1 degree north
);

// Should be close to great circle result for this regional example
assert!(distance > 10000.0 && distance < 12000.0);

Fields

origin: LngLat

Origin point for the ENU projection. Usually set to the midpoint of the polyline being simplified for optimal accuracy.

Trait Implementations

impl PerpDistance for XtEnu

fn d_perp_m(&self, a: LngLat, b: LngLat, p: LngLat) -> f64

Calculate the perpendicular distance from point p to line segment a-b.