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.AdamsBashforthIntegrator;
21  import org.hipparchus.ode.nonstiff.DormandPrince853Integrator;
22  import org.orekit.orbits.OrbitType;
23  import org.orekit.propagation.Propagator;
24  import org.orekit.propagation.SpacecraftState;
25  import org.orekit.propagation.numerical.NumericalPropagator;
26  
27  /**
28   * Test event handling with a {@link NumericalPropagator} and a {@link
29   * AdamsBashforthIntegrator}.
30   *
31   * @author Evan Ward
32   */
33  public class CloseEventsNumericalABTest extends CloseEventsAbstractTest {
34  
35      /**
36       * Create a propagator using the {@link #initialOrbit}.
37       *
38       * @param stepSize   of integrator.
39       * @return a usable propagator.
40       */
41      public Propagator getPropagator(double stepSize) {
42          double[][] tol = NumericalPropagator
43                  .tolerances(10000, initialOrbit, OrbitType.CARTESIAN);
44          final AdamsBashforthIntegrator integrator =
45                          new AdamsBashforthIntegrator(4, stepSize, stepSize, tol[0], tol[1]);
46          final DormandPrince853Integrator starter =
47                          new DormandPrince853Integrator(stepSize / 100, stepSize / 10,
48                                                         tol[0], tol[1]);
49          starter.setInitialStepSize(stepSize / 20);
50          integrator.setStarterIntegrator(starter);
51          final NumericalPropagator propagator = new NumericalPropagator(integrator);
52          propagator.setInitialState(new SpacecraftState(initialOrbit));
53          propagator.setOrbitType(OrbitType.CARTESIAN);
54          return propagator;
55      }
56  
57  }