001/*
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.commons.geometry.euclidean.threed.rotation;
018
019/** Defines different types of rotation axis sequences.
020 */
021public enum AxisSequenceType {
022
023    /** Represents Euler angles, which consist of axis sequences
024     * in the pattern <em>ABA</em>. For example, the sequences {@code ZXZ}, {@code XYX}, etc.
025     * fit this definition. Other types of sequences that do not match this
026     * pattern are often called "Euler angles" in common usage. However, this enum
027     * value is intended to represent only those sequences that match exactly, ie "proper" Euler angles.
028     * @see <a href="https://en.wikipedia.org/wiki/Euler_angles#Proper_Euler_angles">Proper Euler angles</a>
029     */
030    EULER,
031
032    /** Represents Tait-Bryan angles, which consist of axis sequences
033     * in the pattern <em>ABC</em>. For example, the sequences {@code XYZ}, {@code ZXY},
034     * etc. fit this definition. Tait-Bryan angles are also called Cardan angles.
035     * @see <a href="https://en.wikipedia.org/wiki/Euler_angles#Tait%E2%80%93Bryan_angles">Tait-Bryan angles</a>
036     */
037    TAIT_BRYAN
038}