cgmath/tests/transform.rs

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// Copyright 2014 The CGMath Developers. For a full listing of the authors,
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// refer to the Cargo.toml 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.
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extern crate cgmath;
use cgmath::*;
#[test]
fn test_invert() {
let v = Vector3::new(1.0f64, 2.0, 3.0);
let t = Decomposed {
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scale: 1.5f64,
rot: Quaternion::new(0.5f64,0.5,0.5,0.5),
disp: Vector3::new(6.0f64,-7.0,8.0)
};
let ti = t.invert().expect("Expected successful inversion");
let vt = t.transform_vector(v);
assert!(v.approx_eq(&ti.transform_vector(vt)));
}
#[test]
fn test_look_at() {
let eye = Point3::new(0.0f64, 0.0, -5.0);
let center = Point3::new(0.0f64, 0.0, 0.0);
let up = Vector3::new(1.0f64, 0.0, 0.0);
let t: Decomposed<Vector3<f64>, Quaternion<f64>> = Transform::look_at(eye, center, up);
let point = Point3::new(1.0f64, 0.0, 0.0);
let view_point = Point3::new(0.0f64, 1.0, 5.0);
assert!(t.transform_point(point).approx_eq(&view_point));
}
#[test]
fn test_components() {
let t = Decomposed {
scale: 1.5f64,
rot: Quaternion::new(0.5f64,0.5,0.5,0.5),
disp: Vector3::new(6.0f64,-7.0,8.0)
};
let (scale, rot, disp) = t.decompose();
assert_eq!(scale, Vector3::from_value(t.scale));
assert_eq!(rot, t.rot);
assert_eq!(disp, t.disp);
}