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;
018
019import java.util.Collections;
020import java.util.List;
021
022import org.apache.commons.geometry.core.Transform;
023
024/** Interface representing a triangle in Euclidean 3D space.
025 */
026public interface Triangle3D extends ConvexPolygon3D {
027
028    /** The first point in the triangle.
029     * @return the first point in the triangle
030     */
031    Vector3D getPoint1();
032
033    /** The second point in the triangle.
034     * @return the second point in the triangle
035     */
036    Vector3D getPoint2();
037
038    /** The third point in the triangle.
039     * @return the third point in the triangle
040     */
041    Vector3D getPoint3();
042
043    /** {@inheritDoc} */
044    @Override
045    Triangle3D reverse();
046
047    /** {@inheritDoc} */
048    @Override
049    Triangle3D transform(Transform<Vector3D> transform);
050
051    /** {@inheritDoc}
052    *
053    * <p>This method simply returns a singleton list containing this object.</p>
054    */
055    @Override
056    default List<Triangle3D> toTriangles() {
057        return Collections.singletonList(this);
058    }
059}