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/*
* Copyright 2016 Anton Tananaev (anton.tananaev@gmail.com)
*
* 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.traccar.geofence;
import java.text.ParseException;
import java.util.ArrayList;
public class GeofencePolygon extends GeofenceGeometry {
public GeofencePolygon() {
}
public GeofencePolygon(String wkt) throws ParseException {
fromWkt(wkt);
}
private static class Coordinate {
public static final double DEGREE360 = 360;
private double lat;
private double lon;
public double getLat() {
return lat;
}
public void setLat(double lat) {
this.lat = lat;
}
public double getLon() {
return lon;
}
// Need not to confuse algorithm by the abrupt reset of longitude
public double getLon360() {
return lon + DEGREE360;
}
public void setLon(double lon) {
this.lon = lon;
}
}
private ArrayList<Coordinate> coordinates;
private double[] constant;
private double[] multiple;
private void precalc() {
if (coordinates == null) {
return;
}
int polyCorners = coordinates.size();
int i;
int j = polyCorners - 1;
if (constant != null) {
constant = null;
}
if (multiple != null) {
multiple = null;
}
constant = new double[polyCorners];
multiple = new double[polyCorners];
for (i = 0; i < polyCorners; j = i++) {
if (coordinates.get(j).getLon360() == coordinates.get(i).getLon360()) {
constant[i] = coordinates.get(i).getLat();
multiple[i] = 0;
} else {
constant[i] = coordinates.get(i).getLat()
- (coordinates.get(i).getLon360() * coordinates.get(j).getLat())
/ (coordinates.get(j).getLon360() - coordinates.get(i).getLon360())
+ (coordinates.get(i).getLon360() * coordinates.get(i).getLat())
/ (coordinates.get(j).getLon360() - coordinates.get(i).getLon360());
multiple[i] = (coordinates.get(j).getLat() - coordinates.get(i).getLat())
/ (coordinates.get(j).getLon360() - coordinates.get(i).getLon360());
}
}
}
@Override
public boolean containsPoint(double latitude, double longitude) {
int polyCorners = coordinates.size();
int i;
int j = polyCorners - 1;
double longitude360 = longitude + Coordinate.DEGREE360;
boolean oddNodes = false;
for (i = 0; i < polyCorners; j = i++) {
if (coordinates.get(i).getLon360() < longitude360
&& coordinates.get(j).getLon360() >= longitude360
|| coordinates.get(j).getLon360() < longitude360
&& coordinates.get(i).getLon360() >= longitude360) {
oddNodes ^= longitude360 * multiple[i] + constant[i] < latitude;
}
}
return oddNodes;
}
@Override
public String toWkt() {
StringBuffer buf = new StringBuffer();
buf.append("POLYGON (");
for (Coordinate coordinate : coordinates) {
buf.append(String.valueOf(coordinate.getLat()));
buf.append(" ");
buf.append(String.valueOf(coordinate.getLon()));
buf.append(", ");
}
return buf.substring(0, buf.length() - 2) + ")";
}
@Override
public void fromWkt(String wkt) throws ParseException {
if (coordinates == null) {
coordinates = new ArrayList<Coordinate>();
} else {
coordinates.clear();
}
if (!wkt.startsWith("POLYGON")) {
throw new ParseException("Mismatch geometry type", 0);
}
String content = wkt.substring(wkt.indexOf("(") + 1, wkt.indexOf(")"));
if (content == null || content.equals("")) {
throw new ParseException("No content", 0);
}
String[] commaTokens = content.split(",");
if (commaTokens.length < 3) {
throw new ParseException("Not valid content", 0);
}
for (String commaToken : commaTokens) {
String[] tokens = commaToken.trim().split("\\s");
if (tokens.length != 2) {
throw new ParseException("Here must be two coordinates: " + commaToken, 0);
}
Coordinate coordinate = new Coordinate();
try {
coordinate.setLat(Double.parseDouble(tokens[0]));
} catch (NumberFormatException e) {
throw new ParseException(tokens[0] + " is not a double", 0);
}
try {
coordinate.setLon(Double.parseDouble(tokens[1]));
} catch (NumberFormatException e) {
throw new ParseException(tokens[1] + " is not a double", 0);
}
coordinates.add(coordinate);
}
precalc();
}
}
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