Add data generator (#20)

haversine/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "haversine"
+version = "0.1.0"
+edition = "2021"
+
+[lib]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+serde = { version = "1.0.163", features = [ "derive" ] }

haversine/src/distance.rs

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+use crate::haversine::CoordinatePair;
+
+fn square(x: f64) -> f64 {
+    x * x
+}
+
+pub fn naive(point: &CoordinatePair, earth_radius: f64) -> f64 {
+    let lat1 = point.y0;
+    let lat2 = point.y1;
+    let lon1 = point.x0;
+    let lon2 = point.x1;
+
+    let lat_deg = (lat2 - lat1).to_radians();
+    let lon_deg = (lon2 - lon1).to_radians();
+    let lat1 = lat1.to_radians();
+    let lat2 = lat2.to_radians();
+
+    let a = square(f64::sin(lat_deg / 2.0))
+        + f64::cos(lat1) * f64::cos(lat2) * square(f64::sin(lon_deg / 2.0));
+    let c = 2.0 * f64::asin(f64::sqrt(a));
+
+    earth_radius * c
+}

haversine/src/earth.rs

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+pub const RADIUS: f64 = 6372.8;

haversine/src/haversine.rs

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+use serde::Serialize;
+
+#[derive(Serialize)]
+pub struct CoordinatePair {
+    pub x0: f64,
+    pub y0: f64,
+    pub x1: f64,
+    pub y1: f64,
+}
+
+#[derive(Serialize)]
+pub struct HaversineData {
+    pub pairs: Vec<CoordinatePair>,
+}

haversine/src/lib.rs

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+pub mod distance;
+pub mod earth;
+pub mod haversine;