1 /* Copyright 2002-2019 CS Systèmes d'Information 2 * Licensed to CS Systèmes d'Information (CS) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * CS 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.utils; 19 20 import org.orekit.frames.Frame; 21 import org.orekit.time.AbsoluteDate; 22 23 /** 24 ** Interface for PV coordinates providers. 25 * @author Veronique Pommier 26 * <p>The PV coordinates provider interface can be used by any class used for position/velocity 27 * computation, for example celestial bodies or spacecraft position/velocity propagators, 28 * and many others... 29 * </p> 30 */ 31 public interface PVCoordinatesProvider { 32 33 /** Get the {@link PVCoordinates} of the body in the selected frame. 34 * @param date current date 35 * @param frame the frame where to define the position 36 * @return time-stamped position/velocity of the body (m and m/s) 37 */ 38 TimeStampedPVCoordinates getPVCoordinates(AbsoluteDate date, 39 Frame frame); 40 41 }