ConstantAzimuthAiming.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.models.earth.tessellation;
- import java.util.Arrays;
- import java.util.List;
- import org.hipparchus.geometry.euclidean.threed.Vector3D;
- import org.hipparchus.util.FastMath;
- import org.hipparchus.util.SinCos;
- import org.orekit.bodies.GeodeticPoint;
- import org.orekit.bodies.OneAxisEllipsoid;
- /** Class used to orient tiles with respect to a geographic azimuth.
- * @see AlongTrackAiming
- * @see DivertedSingularityAiming
- * @author Luc Maisonobe
- */
- public class ConstantAzimuthAiming implements TileAiming {
- /** Sine and Cosine of the azimuth. */
- private final SinCos sc;
- /** Simple constructor.
- * @param ellipsoid ellipsoid body on which the zone is defined
- * @param azimuth geographic azimuth of the tiles
- */
- public ConstantAzimuthAiming(final OneAxisEllipsoid ellipsoid, final double azimuth) {
- this.sc = FastMath.sinCos(azimuth);
- }
- /** {@inheritDoc} */
- @Override
- public List<GeodeticPoint> getSingularPoints() {
- return Arrays.asList(GeodeticPoint.NORTH_POLE, GeodeticPoint.SOUTH_POLE);
- }
- /** {@inheritDoc} */
- @Override
- public Vector3D alongTileDirection(final Vector3D point, final GeodeticPoint gp) {
- // compute the horizontal direction at fixed azimuth
- return new Vector3D(sc.cos(), gp.getNorth(), sc.sin(), gp.getEast());
- }
- }