From d7d1c786fbe75d444383106ae2b1cd57ee625d18 Mon Sep 17 00:00:00 2001
From: Brendan Zabarauskas <bjzaba@yahoo.com.au>
Date: Tue, 27 Nov 2012 12:34:15 +1000
Subject: [PATCH] Add angle constants

---
 src/angle.rs   | 15 +++++++++++++++
 src/gltypes.rs | 30 +++++++++++++++++++++++++++++-
 2 files changed, 44 insertions(+), 1 deletion(-)

diff --git a/src/angle.rs b/src/angle.rs
index ed1b78a..514be8a 100644
--- a/src/angle.rs
+++ b/src/angle.rs
@@ -16,6 +16,11 @@ pub trait Angle<T>: Add<self,self>
                   , Modulo<T,self>
                   , Neg<self>
                   , Eq, Ord {
+    static pure fn full_rotation() -> self;
+    static pure fn half_rotation() -> self;
+    static pure fn quarter_rotation() -> self;
+    static pure fn eighth_rotation() -> self;
+    
     pure fn to_radians() -> Radians<T>;
     pure fn to_degrees() -> Degrees<T>;
 }
@@ -23,6 +28,11 @@ pub trait Angle<T>: Add<self,self>
 pub enum Radians<T> = T;
 
 pub impl<T:Copy Num NumCast> Radians<T>: Angle<T> {
+    #[inline(always)] static pure fn full_rotation()    -> Radians<T> { Radians(move cast(2.0 * pi)) }
+    #[inline(always)] static pure fn half_rotation()    -> Radians<T> { Radians(move cast(pi))       }
+    #[inline(always)] static pure fn quarter_rotation() -> Radians<T> { Radians(move cast(pi / 2.0)) }
+    #[inline(always)] static pure fn eighth_rotation()  -> Radians<T> { Radians(move cast(pi / 4.0)) }
+    
     #[inline(always)] pure fn to_radians() -> Radians<T> { self }
     #[inline(always)] pure fn to_degrees() -> Degrees<T> { Degrees(*self * cast(180.0 / pi)) }
     
@@ -49,6 +59,11 @@ pub impl<T:Copy Ord> Radians<T>: Ord {
 pub enum Degrees<T> = T;
 
 pub impl<T:Copy Num NumCast> Degrees<T>: Angle<T> {
+    #[inline(always)] static pure fn full_rotation()    -> Degrees<T> { Degrees(move cast(360.0)) }
+    #[inline(always)] static pure fn half_rotation()    -> Degrees<T> { Degrees(move cast(180.0)) }
+    #[inline(always)] static pure fn quarter_rotation() -> Degrees<T> { Degrees(move cast(90.0))  }
+    #[inline(always)] static pure fn eighth_rotation()  -> Degrees<T> { Degrees(move cast(45.0))  }
+    
     #[inline(always)] pure fn to_radians() -> Radians<T> { Radians(*self * cast(pi / 180.0)) }
     #[inline(always)] pure fn to_degrees() -> Degrees<T> { self }
     
diff --git a/src/gltypes.rs b/src/gltypes.rs
index 99e4e47..e11bbd7 100644
--- a/src/gltypes.rs
+++ b/src/gltypes.rs
@@ -22,7 +22,7 @@
 
 use core::sys::size_of;
 
-use angle::{Radians, Degrees, Rotation, Euler};
+use angle::{Angle, Radians, Degrees, Rotation, Euler};
 use mat::{NumericMatrix, NumericMatrixNxN, Mat2, Mat3, Mat4};
 use vec::{Vector, NumericVector, Vec2, Vec3, Vec4};
 use quat::{/*Quaternion, */Quat};
@@ -438,6 +438,34 @@ pub fn dradians(theta: f64) -> dradians { Radians(theta) }
 pub fn degrees(theta: f32)  -> degrees  { Degrees(theta) }
 pub fn ddegrees(theta: f64) -> ddegrees { Degrees(theta) }
 
+pub impl radians {
+    #[inline(always)] static pure fn full_rotation()    -> radians { Angle::full_rotation()    }
+    #[inline(always)] static pure fn half_rotation()    -> radians { Angle::half_rotation()    }
+    #[inline(always)] static pure fn quarter_rotation() -> radians { Angle::quarter_rotation() }
+    #[inline(always)] static pure fn eighth_rotation()  -> radians { Angle::eighth_rotation()  }
+}
+
+pub impl dradians {
+    #[inline(always)] static pure fn full_rotation()    -> dradians { Angle::full_rotation()    }
+    #[inline(always)] static pure fn half_rotation()    -> dradians { Angle::half_rotation()    }
+    #[inline(always)] static pure fn quarter_rotation() -> dradians { Angle::quarter_rotation() }
+    #[inline(always)] static pure fn eighth_rotation()  -> dradians { Angle::eighth_rotation()  }
+}
+
+pub impl degrees {
+    #[inline(always)] static pure fn full_rotation()    -> degrees { Angle::full_rotation()    }
+    #[inline(always)] static pure fn half_rotation()    -> degrees { Angle::half_rotation()    }
+    #[inline(always)] static pure fn quarter_rotation() -> degrees { Angle::quarter_rotation() }
+    #[inline(always)] static pure fn eighth_rotation()  -> degrees { Angle::eighth_rotation()  }
+}
+
+pub impl ddegrees {
+    #[inline(always)] static pure fn full_rotation()    -> ddegrees { Angle::full_rotation()    }
+    #[inline(always)] static pure fn half_rotation()    -> ddegrees { Angle::half_rotation()    }
+    #[inline(always)] static pure fn quarter_rotation() -> ddegrees { Angle::quarter_rotation() }
+    #[inline(always)] static pure fn eighth_rotation()  -> ddegrees { Angle::eighth_rotation()  }
+}
+
 
 // Axis rotation aliases. These are not present in the GLSL specification, but
 // they follow roughly the same nomenclature.