/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, 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.ReferencedEnvelope;
import org.geotools.referencing.CRS;
import org.geotools.referencing.crs.DefaultGeographicCRS;
import org.geotools.referencing.operation.projection.LambertAzimuthalEqualArea;
import org.geotools.referencing.operation.projection.MapProjection;
import org.opengis.parameter.ParameterValueGroup;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* Returns a {@link ProjectionHandler} for the {@link LambertAzimuthalEqualArea} projection
* that will cut geometries 90° away from the projection center (at the moment it works
* only with with the versions centered on poles and the equator)
*
* @author Andrea Aime - GeoSolutions
*
* @source $URL$
*/
public class LambertAzimuthalEqualAreaHandlerFactory implements ProjectionHandlerFactory {
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 LambertAzimuthalEqualArea) {
ParameterValueGroup params = mapProjection.getParameterValues();
double latitudeOfCenter = params.parameter(
LambertAzimuthalEqualArea.Provider.LATITUDE_OF_CENTRE.getName().getCode()).doubleValue();
double longitudeOfCenter = params.parameter(
LambertAzimuthalEqualArea.Provider.LONGITUDE_OF_CENTRE.getName().getCode()).doubleValue();
ReferencedEnvelope validArea;
if(latitudeOfCenter > 0) {
validArea = new ReferencedEnvelope(-180, 180, 0, 90, DefaultGeographicCRS.WGS84);
} else if(latitudeOfCenter < 0) {
validArea = new ReferencedEnvelope(-180, 180, -90, 0, DefaultGeographicCRS.WGS84);
} else {
validArea = new ReferencedEnvelope(longitudeOfCenter - 90, longitudeOfCenter + 90,
-90, 90, DefaultGeographicCRS.WGS84);
}
return new ProjectionHandler(sourceCrs, validArea, renderingEnvelope);
}
return null;
}
}