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-rw-r--r--src/org/traccar/geofence/GeofencePolygon.java173
1 files changed, 173 insertions, 0 deletions
diff --git a/src/org/traccar/geofence/GeofencePolygon.java b/src/org/traccar/geofence/GeofencePolygon.java
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+++ b/src/org/traccar/geofence/GeofencePolygon.java
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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();
+ }
+
+}