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.Decimal64;
23  import org.hipparchus.util.Decimal64Field;
24  import org.orekit.orbits.OrbitType;
25  import org.orekit.propagation.FieldPropagator;
26  import org.orekit.propagation.FieldSpacecraftState;
27  import org.orekit.propagation.numerical.FieldNumericalPropagator;
28  
29  /**
30   * Test event handling with a {@link FieldNumericalPropagator} and a {@link
31   * AdamsBashforthFieldIntegrator}.
32   *
33   * @author Evan Ward
34   */
35  public class FieldCloseEventsNumericalABTest extends FieldCloseEventsAbstractTest<Decimal64> {
36  
37      /** Constructor. */
38      public FieldCloseEventsNumericalABTest() {
39          super(Decimal64Field.getInstance());
40      }
41  
42      /**
43       * Create a propagator using the {@link #initialOrbit}.
44       *
45       * @param stepSize of integrator.
46       * @return a usable propagator.
47       */
48      public FieldPropagator<Decimal64> getPropagator(double stepSize) {
49          double[][] tol = FieldNumericalPropagator
50                  .tolerances(v(10000), initialOrbit, OrbitType.CARTESIAN);
51          final AdamsBashforthFieldIntegrator<Decimal64> integrator =
52                  new AdamsBashforthFieldIntegrator<>(field, 4, stepSize, stepSize, tol[0], tol[1]);
53          final DormandPrince853FieldIntegrator<Decimal64> 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<Decimal64> propagator =
59                  new FieldNumericalPropagator<>(field, integrator);
60          propagator.setInitialState(new FieldSpacecraftState<>(initialOrbit));
61          propagator.setOrbitType(OrbitType.CARTESIAN);
62          return propagator;
63      }
64  
65  }