001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.data.projection.proj;
003
004/**
005 * A {@link Proj} implements this interface, if it derives the central meridian
006 * value from it's other input parameters.
007 *
008 * (Normally the central meridian is projection input parameter and the Proj
009 * class does not deal with it.)
010 *
011 * @see Proj
012 * @since  9532 (creation)
013 * @since 10600 (functional interface)
014 */
015@FunctionalInterface
016public interface ICentralMeridianProvider {
017    /**
018     * Get the central meridian value as computed during initialization.
019     * @return the central meridian in degrees
020     */
021    double getCentralMeridian();
022}