1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.geometry.euclidean.threed.rotation;
18
19 /** Defines different types of rotation axis sequences.
20 */
21 public enum AxisSequenceType {
22
23 /** Represents Euler angles, which consist of axis sequences
24 * in the pattern <em>ABA</em>. For example, the sequences {@code ZXZ}, {@code XYX}, etc.
25 * fit this definition. Other types of sequences that do not match this
26 * pattern are often called "Euler angles" in common usage. However, this enum
27 * value is intended to represent only those sequences that match exactly, ie "proper" Euler angles.
28 * @see <a href="https://en.wikipedia.org/wiki/Euler_angles#Proper_Euler_angles">Proper Euler angles</a>
29 */
30 EULER,
31
32 /** Represents Tait-Bryan angles, which consist of axis sequences
33 * in the pattern <em>ABC</em>. For example, the sequences {@code XYZ}, {@code ZXY},
34 * etc. fit this definition. Tait-Bryan angles are also called Cardan angles.
35 * @see <a href="https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles">Tait-Bryan angles</a>
36 */
37 TAIT_BRYAN
38 }