package org.opentripplanner.api.parameter;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.Status;
import com.vividsolutions.jts.geom.Coordinate;
import com.vividsolutions.jts.geom.Envelope;
public class BoundingCircle {
double lat, lon, radius;
private static final double METERS_PER_DEGREE_LAT = 111111;
private static final double MAX_RADIUS = 10000; // meters
private static void err (String message) {
throw new WebApplicationException(Response
.status(Status.BAD_REQUEST)
.entity(message)
.build());
}
public BoundingCircle (String s) {
String[] elements = s.split(","); // what about ; between coordinates?
if (elements.length != 3) {
err ("A circle must have two coordinates and a radius.");
}
try {
lat = Double.parseDouble(elements[0]);
lon = Double.parseDouble(elements[1]);
radius = Double.parseDouble(elements[2]);
} catch (NumberFormatException pe) {
err ("Unable to parse coordinate: " + pe.getMessage());
}
if (radius < 0 || radius > MAX_RADIUS) {
err ("Radius out of range.");
}
// check that lat/lon are in range as well, using shared geographic range check function
}
public Coordinate center () {
return new Coordinate(lon, lat);
}
public Envelope bbox () {
Envelope env = new Envelope(center());
double meters_per_degree_lon = METERS_PER_DEGREE_LAT * Math.cos(Math.toRadians(lat));
env.expandBy(radius / meters_per_degree_lon, radius / METERS_PER_DEGREE_LAT);
return env;
}
}