X-Git-Url: http://git.dolda2000.com/gitweb/?a=blobdiff_plain;f=src%2Fcommon%2Fgeometry.rs;fp=src%2Fcommon%2Fgeometry.rs;h=ebf122a402171f3fe6f94a419c0dda0d45ad864c;hb=8065e2645a936275c7d69c6068d80ece598d6e57;hp=e46f23e6040fc9784b1e56dc700cf51dccb3a3c7;hpb=b5332019b30abd70698c9cdd7b7b9d42502681c2;p=kaka%2Frust-sdl-test.git

diff --git a/src/common/geometry.rs b/src/common/geometry.rs
index e46f23e..ebf122a 100644
--- a/src/common/geometry.rs
+++ b/src/common/geometry.rs
@@ -173,16 +173,21 @@ pub struct Radians(pub f64);
 
 impl Degrees {
     #[allow(dead_code)]
-    fn to_radians(&self) -> Radians {
+    pub fn to_radians(&self) -> Radians {
 	Radians(self.0.to_radians())
     }
 }
 
 impl Radians {
     #[allow(dead_code)]
-    fn to_degrees(&self) -> Degrees {
+    pub fn to_degrees(&self) -> Degrees {
 	Degrees(self.0.to_degrees())
     }
+
+    /// Returns the reflection of the incident when mirrored along this angle.
+    pub fn mirror(&self, incidence: Radians) -> Radians {
+	Radians((std::f64::consts::PI + self.0 * 2.0 - incidence.0) % std::f64::consts::TAU)
+    }
 }
 
 ////////// INTERSECTION ////////////////////////////////////////////////////////