1   /*
2    * Licensed to the Hipparchus project 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  
18  package org.orekit.propagation.events;
19  
20  import org.hipparchus.ode.nonstiff.GraggBulirschStoerIntegrator;
21  import org.orekit.orbits.OrbitType;
22  import org.orekit.propagation.Propagator;
23  import org.orekit.propagation.SpacecraftState;
24  import org.orekit.propagation.numerical.NumericalPropagator;
25  
26  /**
27   * Test event handling with a {@link NumericalPropagator} and a {@link
28   * GraggBulirschStoerIntegrator}.
29   *
30   * @author Evan Ward
31   */
32  public class CloseEventsNumericalGBSTest extends CloseEventsAbstractTest {
33  
34      /**
35       * Create a propagator using the {@link #initialOrbit}.
36       *
37       * @param stepSize   of integrator.
38       * @return a usable propagator.
39       */
40      public Propagator getPropagator(double stepSize) {
41          double[][] tol = NumericalPropagator
42                  .tolerances(1e-1, initialOrbit, OrbitType.CARTESIAN);
43          final NumericalPropagator propagator = new NumericalPropagator(
44                  new GraggBulirschStoerIntegrator(stepSize, stepSize, tol[0], tol[1]));
45          propagator.setInitialState(new SpacecraftState(initialOrbit));
46          propagator.setOrbitType(OrbitType.CARTESIAN);
47          return propagator;
48      }
49  
50  }