You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
92 lines
3.0 KiB
92 lines
3.0 KiB
/**
|
|
* GeoPoint
|
|
* Copyright 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
|
|
* first published 08.10.2009 on http://yacy.net
|
|
*
|
|
* This file is part of YaCy Content Integration
|
|
*
|
|
* 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; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public License
|
|
* along with this program in the file lgpl21.txt
|
|
* If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
package net.yacy.document.geolocalization;
|
|
|
|
|
|
public class GeoPoint {
|
|
|
|
public static final double meter = 90.0d / 1.0e7d; // this is actually the definition of 'meter': 10 million meter shall be the distance from the equator to the pole
|
|
|
|
private final long latlon; // using one variable for the coordinate pair saves some space
|
|
|
|
public GeoPoint(double lat, double lon) {
|
|
this.latlon = (((long) coord2int(lat)) << 32) | (coord2int(lon));
|
|
}
|
|
|
|
|
|
public GeoPoint(int lat, int lon) {
|
|
this.latlon = (((long) coord2int(lat / 1e6d)) << 32) | (coord2int(lon / 1e6d));
|
|
}
|
|
|
|
public double lon() {
|
|
return int2coord((int) (this.latlon & (Integer.MAX_VALUE)));
|
|
}
|
|
|
|
public double lat() {
|
|
return int2coord((int) (this.latlon >>> 32));
|
|
}
|
|
|
|
private static final double maxint = new Double(Integer.MAX_VALUE).doubleValue();
|
|
private static final double upscale = maxint / 360.0;
|
|
|
|
private static final int coord2int(double coord) {
|
|
return (int) ((coord + 180.0) * upscale);
|
|
}
|
|
|
|
private static final double int2coord(int z) {
|
|
return (z / upscale) - 180.0;
|
|
}
|
|
|
|
/**
|
|
* compute the hash code of a coordinate
|
|
* this produces identical hash codes for locations that are close to each other
|
|
*/
|
|
@Override
|
|
public int hashCode() {
|
|
return (int) ((this.latlon & Integer.MAX_VALUE) >> 1) + (int) (this.latlon >> 33);
|
|
}
|
|
|
|
/**
|
|
* equality test that is needed to use the class inside HashMap/HashSet
|
|
*/
|
|
@Override
|
|
public boolean equals(final Object o) {
|
|
if (!(o instanceof GeoPoint)) return false;
|
|
GeoPoint oo = (GeoPoint) o;
|
|
return (this.latlon == oo.latlon);
|
|
}
|
|
|
|
@Override
|
|
public String toString() {
|
|
return "[" + this.lat() + "," + this.lon() + "]";
|
|
}
|
|
|
|
public static void main(String[] args) {
|
|
double lat = 13.419444d;
|
|
double lon = 52.548611d;
|
|
GeoPoint c = new GeoPoint(lat, lon);
|
|
System.out.println(c.toString() + " #" + c.hashCode());
|
|
System.out.println("error: lat: " + (Math.abs(c.lat() - lat) / meter) + " meter; lon: " + (Math.abs(c.lon() - lon) / meter) + " meter");
|
|
}
|
|
}
|