/*
* 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.MapProjection;
import org.geotools.referencing.operation.projection.TransverseMercator;
import org.geotools.referencing.operation.projection.MapProjection.AbstractProvider;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
/**
* Returns a {@link ProjectionHandler} for the {@link TransverseMercator} projection
* that will cut geometries 45° away from the projection central meridian
*
* @author Andrea Aime - OpenGeo
*
*
* @source $URL$
*/
public class TransverseMercatorHandlerFactory implements ProjectionHandlerFactory {
public ProjectionHandler getHandler(ReferencedEnvelope renderingEnvelope, CoordinateReferenceSystem sourceCrs, boolean wrap, int maxWraps) throws FactoryException {
MapProjection mapProjection = CRS.getMapProjection(renderingEnvelope
.getCoordinateReferenceSystem());
if (renderingEnvelope != null && mapProjection instanceof TransverseMercator) {
double centralMeridian = mapProjection.getParameterValues().parameter(
AbstractProvider.CENTRAL_MERIDIAN.getName().getCode()).doubleValue();
ReferencedEnvelope validArea = new ReferencedEnvelope(centralMeridian - 45,
centralMeridian + 45, -90, 90, DefaultGeographicCRS.WGS84);
return new ProjectionHandler(sourceCrs, validArea, renderingEnvelope);
}
return null;
}
}