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https://github.com/yacy/yacy_search_server.git
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98c1d65415
- order locations by (primary) population and (secondary) longitude (reverse ordering, both) - added population from GeoNames, OpenGeoDB does not have that information - changed default viewpoint of map to (30,15); shows more land and europe in the center git-svn-id: https://svn.berlios.de/svnroot/repos/yacy/trunk@6893 6c8d7289-2bf4-0310-a012-ef5d649a1542
74 lines
2.5 KiB
Java
74 lines
2.5 KiB
Java
/**
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* Coordinates.java
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* Copyright 2009 by Michael Peter Christen; mc@yacy.net, Frankfurt a. M., Germany
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* first published 04.10.2009 on http://yacy.net
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*
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* This file is part of YaCy Content Integration
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program in the file COPYING.LESSER.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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package net.yacy.document.geolocalization;
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public class Coordinates {
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private static final double tenmeter = 90.0 / 1.0e6;
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private final double lon, lat;
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public Coordinates(double lon, double lat) {
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this.lon = lon;
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this.lat = lat;
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}
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public double lon() {
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return this.lon;
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}
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public double lat() {
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return this.lat;
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}
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private static final double bits30 = new Double(1L << 30).doubleValue(); // this is about one billion (US)
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private static final double upscale = bits30 / 360.0;
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private static final int coord2int(double coord) {
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return (int) ((180.0 - coord) * upscale);
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}
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/**
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* compute the hash code of a coordinate
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* this produces identical hash codes for locations that are close to each other
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*/
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public int hashCode() {
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return coord2int(this.lon) + (coord2int(this.lat) >> 15);
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}
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/**
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* equality test that is needed to use the class inside HashMap/HashSet
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*/
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public boolean equals(final Object o) {
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if (!(o instanceof Coordinates)) return false;
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Coordinates oo = (Coordinates) o;
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if (this.lon == oo.lon && this.lat == oo.lat) return true;
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// we access fuzzy values that are considered as equal if they are close to each other
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return Math.abs(this.lon - oo.lon) < tenmeter && Math.abs(this.lat - oo.lat) < tenmeter;
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}
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public String toString() {
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return "[" + this.lon + "," + this.lat + "]";
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}
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}
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