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.AdamsBashforthFieldIntegrator;
21  import org.hipparchus.ode.nonstiff.DormandPrince853FieldIntegrator;
22  import org.hipparchus.util.Binary64;
23  import org.hipparchus.util.Binary64Field;
24  import org.orekit.orbits.OrbitType;
25  import org.orekit.propagation.FieldPropagator;
26  import org.orekit.propagation.FieldSpacecraftState;
27  import org.orekit.propagation.ToleranceProvider;
28  import org.orekit.propagation.numerical.FieldNumericalPropagator;
29  
30  /**
31   * Test event handling with a {@link FieldNumericalPropagator} and a {@link
32   * AdamsBashforthFieldIntegrator}.
33   *
34   * @author Evan Ward
35   */
36  public class FieldCloseEventsNumericalABTest extends FieldCloseEventsAbstractTest<Binary64> {
37  
38      /** Constructor. */
39      public FieldCloseEventsNumericalABTest() {
40          super(Binary64Field.getInstance());
41      }
42  
43      /**
44       * Create a propagator using the {@link #initialOrbit}.
45       *
46       * @param stepSize of integrator.
47       * @return a usable propagator.
48       */
49      public FieldPropagator<Binary64> getPropagator(double stepSize) {
50          double[][] tol = ToleranceProvider.getDefaultToleranceProvider(10000).getTolerances(initialOrbit, OrbitType.CARTESIAN);
51          final AdamsBashforthFieldIntegrator<Binary64> integrator =
52                  new AdamsBashforthFieldIntegrator<>(field, 4, stepSize, stepSize, tol[0], tol[1]);
53          final DormandPrince853FieldIntegrator<Binary64> starter =
54                  new DormandPrince853FieldIntegrator<>(
55                          field, stepSize / 100, stepSize / 10, tol[0], tol[1]);
56          starter.setInitialStepSize(stepSize / 20);
57          integrator.setStarterIntegrator(starter);
58          final FieldNumericalPropagator<Binary64> propagator =
59                  new FieldNumericalPropagator<>(field, integrator);
60          propagator.setInitialState(new FieldSpacecraftState<>(initialOrbit));
61          propagator.setOrbitType(OrbitType.CARTESIAN);
62          return propagator;
63      }
64  
65  }