Added util

lib/util/Cargo.toml

@@ -0,0 +1,20 @@
+[package]
+name = "galactica-util"
+description = "Shared utilities"
+categories = { workspace = true }
+keywords = { workspace = true }
+version = { workspace = true }
+rust-version = { workspace = true }
+authors = { workspace = true }
+edition = { workspace = true }
+homepage = { workspace = true }
+repository = { workspace = true }
+license = { workspace = true }
+documentation = { workspace = true }
+readme = { workspace = true }
+
+[lints]
+workspace = true
+
+[dependencies]
+nalgebra = { workspace = true }

lib/util/src/lib.rs

@@ -0,0 +1,20 @@
+#![warn(missing_docs)]
+//! Shared utilities
+
+use nalgebra::Vector2;
+
+/// Convert an angle in degrees to radians
+pub const fn to_radians(degrees: f32) -> f32 {
+	return (degrees / 360.0) * std::f32::consts::TAU;
+}
+
+/// Convert an angle in radians to degrees
+pub const fn to_degrees(radians: f32) -> f32 {
+	return (radians / std::f32::consts::TAU) * 360.0;
+}
+
+/// Compute the clockwise angle between two vectors
+/// Returns a value in [-pi, pi]
+pub fn clockwise_angle(a: &Vector2<f32>, b: &Vector2<f32>) -> f32 {
+	(a.x * b.y - b.x * a.y).atan2(a.dot(&b))
+}