/**
* Copyright (C) 2011 Brian Ferris <bdferris@onebusaway.org>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.onebusaway.geospatial.services;
import java.awt.geom.Point2D;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.Arrays;
import java.util.Collection;
import org.onebusaway.geospatial.model.CoordinatePoint;
import org.onebusaway.geospatial.model.XYPoint;
import com.jhlabs.map.proj.Projection;
import com.jhlabs.map.proj.ProjectionFactory;
public class Proj4Projection implements ICoordinateProjection, Serializable {
private static final long serialVersionUID = 1L;
private String[] _spec;
private transient Projection _projection;
public Proj4Projection(String... spec) {
_spec = spec;
populateProjection();
}
public String[] getSpec() {
return _spec;
}
public XYPoint forward(CoordinatePoint point) {
Point2D.Double from = new Point2D.Double(point.getLon(), point.getLat());
Point2D.Double result = new Point2D.Double();
result = _projection.transform(from, result);
return new XYPoint(result.x, result.y);
}
public <T extends Collection<XYPoint>> T forward(
Iterable<CoordinatePoint> source, T dest, int size) {
for (CoordinatePoint p : source)
dest.add(forward(p));
return dest;
}
public CoordinatePoint reverse(XYPoint point) {
Point2D.Double from = new Point2D.Double(point.getX(), point.getY());
Point2D.Double result = new Point2D.Double();
_projection.inverseTransform(from, result);
return new CoordinatePoint(result.y, result.x);
}
public <T extends Collection<CoordinatePoint>> T reverse(
Iterable<XYPoint> source, T dest, int size) {
for (XYPoint p : source)
dest.add(reverse(p));
return dest;
}
/***************************************************************************
* {@link Object} Interface
**************************************************************************/
@Override
public boolean equals(Object obj) {
if (obj == null || !(obj instanceof Proj4Projection))
return false;
Proj4Projection proj = (Proj4Projection) obj;
return Arrays.equals(this._spec, proj._spec);
}
@Override
public int hashCode() {
return Arrays.hashCode(_spec);
}
/***************************************************************************
* Serialization Support
**************************************************************************/
private void populateProjection() {
_projection = ProjectionFactory.fromPROJ4Specification(_spec);
}
private void writeObject(ObjectOutputStream out) throws IOException {
out.writeObject(_spec);
}
private void readObject(ObjectInputStream in) throws IOException,
ClassNotFoundException {
_spec = (String[]) in.readObject();
populateProjection();
}
}