Add ToStr impls for point, vector and quaternion types

src/cgmath/point.rs

@@ -78,3 +78,15 @@ array!(impl<S> Point3<S> -> [S, ..3])
 
 impl<S: Clone + Num> Point<S, Vec2<S>, [S, ..2]> for Point2<S>;
 impl<S: Clone + Num> Point<S, Vec3<S>, [S, ..3]> for Point3<S>;
+
+impl<S> ToStr for Point2<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("[%?, %?]", self.x, self.y)
+    }
+}
+
+impl<S> ToStr for Point3<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("[%?, %?, %?]", self.x, self.y, self.z)
+    }
+}

src/cgmath/quaternion.rs

@@ -233,3 +233,9 @@ impl<S: Clone + Float> Neg<Quat<S>> for Quat<S> {
         Quat::from_sv(-self.s, -self.v)
     }
 }
+
+impl<S> ToStr for Quat<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("%? + %?i + %?j + %?k", self.s, self.v.x, self.v.y, self.v.z)
+    }
+}

src/cgmath/vector.rs

@@ -219,3 +219,21 @@ impl<S: Clone + Float> EuclideanVector<S, [S, ..3]> for Vec3<S> {
         atan2(self.cross(other).length(), self.dot(other))
     }
 }
+
+impl<S> ToStr for Vec2<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("[%?, %?]", self.x, self.y)
+    }
+}
+
+impl<S> ToStr for Vec3<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("[%?, %?, %?]", self.x, self.y, self.z)
+    }
+}
+
+impl<S> ToStr for Vec4<S> {
+    fn to_str(&self) -> ~str {
+        fmt!("[%?, %?, %?, %?]", self.x, self.y, self.z, self.w)
+    }
+}