Add support for parsing direction from orientation events

Author: fwcd

lighthouse-protocol/src/input/input_event.rs

@@ -34,7 +34,10 @@ impl InputEvent {
 
     /// Parses the input event as an arbitrary direction.
     pub fn direction(&self) -> Option<Direction> {
-        self.left_direction().or_else(|| self.right_direction())
+        match self {
+            InputEvent::Orientation(orientation) => orientation.direction(),
+            _ => self.left_direction().or_else(|| self.right_direction()),
+        }
     }
 
     /// The direction if the input event represents a WASD key, D-pad or left stick.

lighthouse-protocol/src/input/orientation_event.rs

@@ -1,5 +1,7 @@
 use serde::{Deserialize, Serialize};
 
+use crate::{Direction, Vec2};
+
 use super::EventSource;
 
 /// A device orientation event.
@@ -17,3 +19,18 @@ pub struct OrientationEvent {
     /// The motion of the device around the y-axis (left to right motion), in degrees from -90 (inclusive) to 90 (exclusive).
     pub gamma: Option<f64>,
 }
+
+impl OrientationEvent {
+    /// The approximate direction (outside of a small deadzone) for a phone tilted against a flat surface.
+    pub fn direction(&self) -> Option<Direction> {
+        let Some(beta) = self.beta else { return None };
+        let Some(gamma) = self.gamma else { return None };
+
+        let deadzone_radius: f64 = 10.0;
+        if beta.max(gamma) < deadzone_radius {
+            return None;
+        }
+
+        Direction::approximate_from(Vec2::new(gamma, beta))
+    }
+}