/*
* 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.AxisOrder;
import org.opengis.referencing.FactoryException;
import org.opengis.referencing.crs.CoordinateReferenceSystem;
import org.opengis.referencing.crs.GeographicCRS;
/**
* Returns a {@link ProjectionHandler} for any {@link GeographicCRS}
*
*
* @source $URL$
*/
public class GeographicHandlerFactory implements ProjectionHandlerFactory {
static final double MAX_LATITUDE = 89.99;
static final double MIN_LATITUDE = -89.99;
public ProjectionHandler getHandler(ReferencedEnvelope renderingEnvelope, CoordinateReferenceSystem sourceCrs, boolean wrap, int maxWraps) throws FactoryException {
CoordinateReferenceSystem crs = renderingEnvelope.getCoordinateReferenceSystem();
if (renderingEnvelope != null && crs instanceof GeographicCRS) {
GeographicCRS geogCrs = (GeographicCRS) CRS.getHorizontalCRS(crs);
CoordinateReferenceSystem horizontalSourceCrs = CRS.getHorizontalCRS(sourceCrs);
ReferencedEnvelope validArea = null;
if(horizontalSourceCrs instanceof GeographicCRS && !CRS.equalsIgnoreMetadata(horizontalSourceCrs, geogCrs)) {
// datum shifts will create unpleasant effects if we have the poles in the mix,
// cut them out
if(!CRS.equalsIgnoreMetadata(horizontalSourceCrs, geogCrs)) {
if(CRS.getAxisOrder(sourceCrs) == AxisOrder.NORTH_EAST) {
validArea = new ReferencedEnvelope(MIN_LATITUDE, MAX_LATITUDE, Float.MAX_VALUE, -Float.MAX_VALUE, horizontalSourceCrs);
} else {
validArea = new ReferencedEnvelope(Float.MAX_VALUE, -Float.MAX_VALUE, MIN_LATITUDE, MAX_LATITUDE, horizontalSourceCrs);
}
}
}
if(wrap && maxWraps > 0) {
double centralMeridian = geogCrs.getDatum().getPrimeMeridian().getGreenwichLongitude();
return new WrappingProjectionHandler(renderingEnvelope, validArea, sourceCrs, centralMeridian, maxWraps);
} else {
return new ProjectionHandler(sourceCrs, validArea, renderingEnvelope);
}
}
return null;
}
}