Java tutorial
/* Copyright 2002-2015 CS Systmes d'Information * Licensed to CS Systmes d'Information (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 org.apache.commons.math3.geometry.euclidean.threed.Vector3D; import org.apache.commons.math3.util.FastMath; import org.orekit.bodies.GeodeticPoint; import org.orekit.bodies.OneAxisEllipsoid; /** Class used to orient tiles with respect to a geographic azimuth. * @see AlongTrackAiming * @author Luc Maisonobe */ public class ConstantAzimuthAiming implements TileAiming { /** Cosine of the azimuth. */ private final double cos; /** Sine of the azimuth. */ private final double sin; /** 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.cos = FastMath.cos(azimuth); this.sin = FastMath.sin(azimuth); } /** {@inheritDoc} */ @Override public Vector3D alongTileDirection(final Vector3D point, final GeodeticPoint gp) { // compute the horizontal direction at fixed azimuth return new Vector3D(cos, gp.getNorth(), sin, gp.getEast()); } }