PiecewisePart.java
- /* Copyright 2002-2022 CS GROUP
- * Licensed to CS GROUP (CS) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership.
- * CS licenses this file to You under the Apache License, Version 2.0
- * (the "License"); you may not use this file except in compliance with
- * the License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- package org.orekit.forces.gravity.potential;
- import org.hipparchus.util.SinCos;
- /** Part of a {@link PiecewiseSphericalHarmonics piecewise gravity fields} valid for one time interval.
- * @author Luc Maisonobe
- * @since 11.1
- */
- class PiecewisePart {
- /** Converter between (degree, order) indices and flatten array. */
- private final Flattener flattener;
- /** Components of the spherical harmonics. */
- private final TimeDependentHarmonic[] components;
- /** Simple constructor.
- * @param flattener converter between (degree, order) indices and flatten array
- * @param components components of the spherical harmonics
- */
- PiecewisePart(final Flattener flattener, final TimeDependentHarmonic[] components) {
- this.flattener = flattener;
- this.components = components.clone();
- }
- /** Get the maximum supported degree.
- * @return maximal supported degree
- */
- public int getMaxDegree() {
- return flattener.getDegree();
- }
- /** Get the maximal supported order.
- * @return maximal supported order
- */
- public int getMaxOrder() {
- return flattener.getOrder();
- }
- /** Compute the time-dependent part of a spherical harmonic cosine coefficient.
- * @param n degree of the coefficient
- * @param m order of the coefficient
- * @param offsets offsets to reference dates in the gravity field
- * @param pulsations angular pulsations in the gravity field
- * @return raw coefficient Cnm
- */
- public double computeCnm(final int n, final int m,
- final double[] offsets, final SinCos[][] pulsations) {
- final TimeDependentHarmonic harmonic = components[flattener.index(n, m)];
- return harmonic == null ? 0.0 : harmonic.computeCnm(offsets, pulsations);
- }
- /** Compute the time-dependent part of a spherical harmonic sine coefficient.
- * @param n degree of the coefficient
- * @param m order of the coefficient
- * @param offsets offsets to reference dates in the gravity field
- * @param pulsations angular pulsations in the gravity field
- * @return raw coefficient Snm
- */
- public double computeSnm(final int n, final int m,
- final double[] offsets, final SinCos[][] pulsations) {
- final TimeDependentHarmonic harmonic = components[flattener.index(n, m)];
- return harmonic == null ? 0.0 : harmonic.computeSnm(offsets, pulsations);
- }
- }