/**
* 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.transit_data_federation.impl.shapes;
import org.onebusaway.collections.Min;
import org.onebusaway.geospatial.model.CoordinatePoint;
import org.onebusaway.transit_data_federation.model.ShapePoints;
public class LocationShapePointIndex extends AbstractShapePointIndex {
private double _lat;
private double _lon;
public LocationShapePointIndex(double lat, double lon) {
_lat = lat;
_lon = lon;
}
@Override
public int getIndex(ShapePoints points) {
Min<Integer> m = new Min<Integer>();
int n = points.getSize();
double[] lats = points.getLats();
double[] lons = points.getLons();
for (int i = 0; i < n; i++) {
double d = distance(_lat, _lon, lats[i], lons[i]);
m.add(d, i);
}
return m.getMinElement();
}
@Override
public CoordinatePoint getPoint(ShapePoints points) {
return new CoordinatePoint(_lat, _lon);
}
@Override
public PointAndOrientation getPointAndOrientation(ShapePoints points) {
return new PointAndOrientation(_lat, _lon, 0);
}
private static double distance(double lat1, double lon1, double lat2,
double lon2) {
double dLat = lat1 - lat2;
double dLon = lon1 - lon2;
return Math.sqrt(dLat * dLat + dLon * dLon);
}
}