1   /* Copyright 2020 Exotrail
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    * Exotrail 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.forces.maneuvers.propulsion;
18  
19  import org.hipparchus.geometry.euclidean.threed.Vector3D;
20  import org.orekit.frames.Frame;
21  import org.orekit.time.AbsoluteDate;
22  import org.orekit.utils.PVCoordinatesProvider;
23  
24  /**
25   * Interface to compute the thrust direction of a maneuver.
26   *
27   * @author Mikael Fillastre
28   * @author Andrea Fiorentino
29   * @since 10.2
30   */
31  
32  public interface ThrustDirectionProvider {
33  
34      /**
35       * Compute the thrust direction corresponding to an orbital state.
36       *
37       * @param pvProv local position-velocity provider around current date
38       * @param date   current date
39       * @param frame  reference frame from which attitude is computed
40       * @return direction thrust direction at the specified date and
41       *         position-velocity state
42       */
43      Vector3D computeThrustDirection(PVCoordinatesProvider pvProv, AbsoluteDate date, Frame frame);
44  }