Initial commit of transform module

src/cgmath/transform.rs

@@ -0,0 +1,40 @@
+// 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 Transform<S> {
+    fn transform_vec(&self, point: Point3<S>) -> Point3<S>;
+    fn transform_point(&self, point: Point3<S>) -> Point3<S>;
+    fn transform_ray(&self, ray: Ray3<S>) -> Ray3<S>;
+}
+
+/// A homogeneous transformation matrix.
+pub struct AffineMatrix3<S> {
+    mat: Mat4<S>,
+}
+
+/// A transformation in three dimensions consisting of a rotation,
+/// displacement vector and scale amount.
+pub struct Transform3<S, R> {
+    rot: R,
+    disp: Vec3<S>,
+    scale: S,
+}
+
+impl<S: Float, R: Rotation3<S>> Transform3<S, R> {
+    #[inline]
+    pub fn new(rot: R, disp: Vec3<S>, scale: S) -> Transform3<S, R> {
+        Transform3 { rot: rot, disp: disp, scale: S }
+    }
+}