speedtest_rs/
distance.rs

1use std::f32::consts;
2
3#[derive(Clone, Debug, PartialEq, Default)]
4pub struct EarthLocation {
5    pub latitude: f32,
6    pub longitude: f32,
7}
8
9pub fn compute_distance(origin: &EarthLocation, destination: &EarthLocation) -> f32 {
10    let radius: f32 = 6371.0;
11    let d_lat = to_radians(origin.latitude - destination.latitude);
12    let d_long = to_radians(origin.longitude - destination.longitude);
13    let a = (d_lat / 2.0).sin() * (d_lat / 2.0).sin()
14        + to_radians(origin.latitude).cos()
15            * to_radians(destination.latitude).cos()
16            * (d_long / 2.0).sin()
17            * (d_long / 2.0).sin();
18    let c = 2.0 * a.sqrt().atan2((1.0 - a).sqrt());
19    radius * c
20}
21
22fn to_radians(degree: f32) -> f32 {
23    let value: f32 = consts::PI;
24    degree * (value / 180.0f32)
25}
26
27#[cfg(test)]
28mod tests {
29    use super::*;
30
31    #[test]
32    fn test_distance() {
33        let origin = EarthLocation {
34            latitude: 32.9545,
35            longitude: -117.2333,
36        };
37        let destination = EarthLocation {
38            latitude: 70.0733,
39            longitude: 29.7497,
40        };
41        let distance = compute_distance(&origin, &destination);
42        let diff = (distance - 8255.1).abs();
43        println!("distance: {distance} diff: {diff}");
44        assert!(diff < 0.2);
45    }
46}
speedtest_rs/distance.rs

speedtest_rs/
distance.rs
