1   /* Copyright 2002-2025 CS GROUP
2    * Licensed to CS GROUP (CS) under one or more
3    * contributor license agreements.  See the NOTICE file distributed with
4    * this work for additional information regarding copyright ownership.
5    * CS 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.orekit.frames;
18  
19  import org.orekit.bodies.CelestialBody;
20  import org.orekit.utils.AngularDerivativesFilter;
21  import org.orekit.utils.CartesianDerivativesFilter;
22  import org.orekit.utils.Constants;
23  import org.orekit.utils.OrekitConfiguration;
24  
25  /** Class to create a L2 centered frame with {@link L2TransformProvider}.
26   *  Parent frame is always set as primaryBody.getInertiallyOrientedFrame()
27   * @author Luc Maisonobe
28   * @author Julio Hernanz
29   */
30  public class L2Frame extends Frame {
31  
32      /** Simple constructor.
33       * @param primaryBody Celestial body with bigger mass, m1.
34       * @param secondaryBody Celestial body with smaller mass, m2.
35       */
36      public L2Frame(final CelestialBody primaryBody, final CelestialBody secondaryBody) {
37          super(primaryBody.getInertiallyOrientedFrame(),
38                new ShiftingTransformProvider(new L2TransformProvider(primaryBody, secondaryBody),
39                                              CartesianDerivativesFilter.USE_P,
40                                              AngularDerivativesFilter.USE_R,
41                                              5, Constants.JULIAN_DAY / 24,
42                                              OrekitConfiguration.getCacheSlotsNumber(),
43                                              Constants.JULIAN_YEAR, 30 * Constants.JULIAN_DAY),
44                primaryBody.getName() + "-" + secondaryBody.getName() + "-L2", true);
45      }
46  
47  }