Add trait for defining intersections

src/cgmath/intersect.rs

@@ -0,0 +1,18 @@
+// Copyright 2013 The CGMath Developers. For a full listing of the authors,
+// refer to the AUTHORS file at the top-level directory of this distribution.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+pub trait Intersect<Result> {
+    fn intersection(&self) -> Result;
+}

src/cgmath/lib.rs

@@ -33,11 +33,12 @@ pub mod point;
 pub mod ray;
 pub mod rotation;
 
-pub mod frustum;
 pub mod projection;
 
 pub mod aabb;
 pub mod cylinder;
+pub mod frustum;
+pub mod intersect;
 pub mod obb;
 pub mod sphere;
 

src/cgmath/plane.rs

@@ -13,6 +13,9 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
+use intersect::Intersect;
+use point::Point3;
+use ray::Ray3;
 use vector::Vec3;
 
 use std::fmt;
@@ -32,6 +35,24 @@ pub struct Plane<S> {
     distance: S,
 }
 
+impl<S: Clone + Float> Intersect<Option<Point3<S>>> for (Plane<S>, Ray3<S>) {
+    fn intersection(&self) -> Option<Point3<S>> {
+        fail!("Not yet implemented");
+    }
+}
+
+impl<S: Clone + Float> Intersect<Option<Ray3<S>>> for (Plane<S>, Plane<S>) {
+    fn intersection(&self) -> Option<Ray3<S>> {
+        fail!("Not yet implemented");
+    }
+}
+
+impl<S: Clone + Float> Intersect<Option<Point3<S>>> for (Plane<S>, Plane<S>, Plane<S>) {
+    fn intersection(&self) -> Option<Point3<S>> {
+        fail!("Not yet implemented");
+    }
+}
+
 impl<S: Clone + fmt::Float> ToStr for Plane<S> {
     fn to_str(&self) -> ~str {
         format!("{:f}x + {:f}y + {:f}z + {:f} = 0",