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The main module contains the GeoTools public interfaces that are used by other GeoTools modules (and GeoTools applications). Where possible we make use industry standard terms as provided by OGC and ISO standards. The formal GeoTools public api consists of gt-metadata, jts and the gt-main module. The main module contains the default implementations that are available provided to other GeoTools modules using our factory system. Factories are obtained from an appropriate FactoryFinder, giving applications a chance configure the factory used using the Factory Hints facilities. FilterFactory ff = CommonFactoryFinder.getFilterFactory(); Expression expr = ff.add( expression1, expression2 ); If you find yourself using implementation specific classes chances are you doing it wrong: Expression expr = new AddImpl( expression1, expressiom2 );

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/*
 *    GeoTools - The Open Source Java GIS Toolkit
 *    http://geotools.org
 *
 *    (C) 2020, Open Source Geospatial Foundation (OSGeo)
 *
 *    This library is free software; you can redistribute it and/or
 *    modify it under the terms of the GNU Lesser General Public
 *    License as published by the Free Software Foundation;
 *    version 2.1 of the License.
 *
 *    This library is distributed in the hope that it will be useful,
 *    but WITHOUT ANY WARRANTY; without even the implied warranty of
 *    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *    Lesser General Public License for more details.
 */
package org.geotools.renderer.crs;

import org.geotools.geometry.jts.LiteCoordinateSequence;
import org.geotools.geometry.jts.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.geotools.referencing.operation.projection.Homolosine;
import org.geotools.referencing.operation.projection.MapProjection;
import org.locationtech.jts.geom.GeometryFactory;
import org.locationtech.jts.geom.LinearRing;
import org.locationtech.jts.geom.Polygon;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;

/**
 * Returns a {@link ProjectionHandler} for the {@link Homolosine} projection that will cut
 * geometries on interruptions before reprojection
 *
 * @author Andrea Aime - GeoSolutions
 */
public class HomolosineHandlerFactory implements ProjectionHandlerFactory {

    static final double EPS = 0.00001;

    public ProjectionHandler getHandler(
            ReferencedEnvelope renderingEnvelope,
            CoordinateReferenceSystem sourceCrs,
            boolean wrap,
            int maxWraps)
            throws FactoryException {
        if (renderingEnvelope == null) {
            return null;
        }

        MapProjection mapProjection =
                CRS.getMapProjection(renderingEnvelope.getCoordinateReferenceSystem());
        if (mapProjection instanceof Homolosine) {
            final double[] MASK_COORDS = {
                // north side
                -180,
                -90,
                -180,
                90,
                -40 - EPS,
                90,
                -40 - EPS,
                0,
                -40 + EPS,
                0,
                -40 + EPS,
                90,
                180,
                90,
                // south side
                180,
                -90,
                80 + EPS,
                -90,
                80 + EPS,
                0,
                80 - EPS,
                0,
                80 - EPS,
                -90,
                -20 + EPS,
                -90,
                -20 + EPS,
                0,
                -20 - EPS,
                0,
                -20 - EPS,
                -90,
                -100 + EPS,
                -90,
                -100 + EPS,
                0,
                -100 - EPS,
                0,
                -100 - EPS,
                -90,
                -180,
                -90
            };
            LiteCoordinateSequence cs = new LiteCoordinateSequence(MASK_COORDS, 2);
            GeometryFactory gf = new GeometryFactory();
            LinearRing shell = gf.createLinearRing(cs);
            Polygon mask = gf.createPolygon(shell);

            return new ProjectionHandler(sourceCrs, mask, renderingEnvelope);
        }

        return null;
    }
}