// **********************************************************************
//
// <copyright>
//
// BBN Technologies
// 10 Moulton Street
// Cambridge, MA 02138
// (617) 873-8000
//
// Copyright (C) BBNT Solutions LLC. All rights reserved.
//
// </copyright>
// **********************************************************************
//
// $Source: /cvs/distapps/openmap/src/openmap/com/bbn/openmap/proj/LLXYLoader.java,v $
// $RCSfile: LLXYLoader.java,v $
// $Revision: 1.1.2.4 $
// $Date: 2008/09/18 23:23:42 $
// $Author: dietrick $
//
// **********************************************************************
package com.bbn.openmap.proj;
import com.bbn.openmap.LatLonPoint;
import com.bbn.openmap.proj.coords.DatumShiftGCT;
import com.bbn.openmap.util.PropUtils;
import com.bbn.openmap.util.Debug;
import java.util.Properties;
/**
* ProjectionLoader to add the LLXY projection to an OpenMap
* application.
*
* @see BasicProjectionLoader
*/
public class LLXYLoader extends BasicProjectionLoader implements
ProjectionLoader {
public LLXYLoader() {
super(LLXY.class,
LLXY.LLXYName,
"Equivalent projection, used for many web data sources.");
}
/**
* Create the projection with the given parameters.
*
* @throws exception if a parameter is missing or invalid.
*/
public Projection create(Properties props) throws ProjectionException {
try {
LatLonPoint llp = (LatLonPoint) props.get(ProjectionFactory.CENTER);
float scale = PropUtils.floatFromProperties(props,
ProjectionFactory.SCALE,
10000000);
int height = PropUtils.intFromProperties(props,
ProjectionFactory.HEIGHT,
100);
int width = PropUtils.intFromProperties(props,
ProjectionFactory.WIDTH,
100);
Proj proj = new LLXY(llp, scale, width, height);
Ellipsoid ellps = (Ellipsoid) props.get(ProjectionFactory.DATUM);
if ((ellps != null) && (ellps != Ellipsoid.WGS_84)) {
proj = new DatumShiftProjection(proj, new DatumShiftGCT(ellps));
}
return proj;
} catch (Exception e) {
if (Debug.debugging("proj")) {
Debug.output("LLXYLoader: problem creating LLXY projection "
+ e.getMessage());
}
}
throw new ProjectionException("LLXYLoader: problem creating LLXY projection");
}
}