Implement ToStr for angle types

src/angle.rs

@@ -1,5 +1,6 @@
 use core::cmp::{Eq, Ord};
 use core::f64::consts::pi;
+
 use funs::triganomic::{cos, sin};
 use mat::{Mat3, Mat4};
 use num::cast::{NumCast, cast};
@@ -100,6 +101,10 @@ pub impl<T:Copy Ord> Radians<T>: Ord {
     #[inline(always)] pure fn gt(&self, other: &Radians<T>) -> bool { **self >  **other }
 }
 
+pub impl<T> Radians<T>: ToStr {
+    pure fn to_str() -> ~str { fmt!("%? rad", *self) }
+}
+
 
 
 
@@ -174,6 +179,10 @@ pub impl<T:Copy Ord> Degrees<T>: Ord {
     #[inline(always)] pure fn gt(&self, other: &Degrees<T>) -> bool { **self >  **other }
 }
 
+pub impl<T> Degrees<T>: ToStr {
+    pure fn to_str() -> ~str { fmt!("%?\xB0", *self) }
+}
+
 
 
 

src/test/test_angle.rs

@@ -31,6 +31,8 @@ fn test_radians() {
     assert *(Radians(pi) / 2.0)                 == *Radians(pi / 2.0);
     assert *(Radians(3.0 * pi) % (2.0 * pi))    == *Radians(pi);
     assert *(-Radians(pi))                      == *Radians(-pi);
+    
+    assert fmt!("%s", Radians(1).to_str())      == ~"1 rad";
 }
 
 #[test]
@@ -60,6 +62,8 @@ fn test_degrees() {
     assert (Degrees(180.0) / 2.0)               == Degrees(90.0);
     assert (Degrees(540.0) % (360.0))           == Degrees(180.0);
     assert (-Degrees(180.0))                    == Degrees(-180.0);
+    
+    assert fmt!("%s", Degrees(180.0).to_str())  == ~"180°";
 }