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For #100 - moved geo-fence calculation to a separate class
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src/main/java/org/traccar/web/server/model/GeoFenceCalculator.java
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| /* | ||
| * Copyright 2015 Vitaly Litvak ([email protected]) | ||
| * | ||
| * 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.web.server.model; | ||
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| import org.traccar.web.shared.model.GeoFence; | ||
| import org.traccar.web.shared.model.Position; | ||
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| import java.awt.*; | ||
| import java.awt.geom.Path2D; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
|
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| public class GeoFenceCalculator { | ||
| private static final double radKoef = Math.PI / 180; | ||
| private static final double earthRadius = 6371.01; // Radius of the earth in km | ||
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| static double getDistance(double lonX, double latX, double lonY, double latY) { | ||
| double dLat = (latX - latY) * radKoef; | ||
| double dLon = (lonX - lonY) * radKoef; | ||
| double a = | ||
| Math.sin(dLat / 2) * Math.sin(dLat / 2) + | ||
| Math.cos(latX * radKoef) * Math.cos(latY * radKoef) * | ||
| Math.sin(dLon / 2) * Math.sin(dLon / 2) | ||
| ; | ||
| double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a)); | ||
| return earthRadius * c; // Distance in km | ||
| } | ||
|
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| private static class GeoFenceData { | ||
| final List<GeoFence.LonLat> points; | ||
| final Shape shape; | ||
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| GeoFenceData(List<GeoFence.LonLat> points, Shape shape) { | ||
| this.points = points; | ||
| this.shape = shape; | ||
| } | ||
| } | ||
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| private final Map<GeoFence, GeoFenceData> geoFences; | ||
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| public GeoFenceCalculator(List<GeoFence> geoFences) { | ||
| this.geoFences = new HashMap<GeoFence, GeoFenceData>(geoFences.size()); | ||
| for (GeoFence geoFence : geoFences) { | ||
| List<GeoFence.LonLat> points = geoFence.points(); | ||
| Shape shape = null; | ||
| switch (geoFence.getType()) { | ||
| case POLYGON: | ||
| Path2D polygon = new Path2D.Double(); | ||
| for (GeoFence.LonLat point : geoFence.points()) { | ||
| if (polygon.getCurrentPoint() == null) { | ||
| polygon.moveTo(point.lon, point.lat); | ||
| } else { | ||
| polygon.lineTo(point.lon, point.lat); | ||
| } | ||
| } | ||
| polygon.closePath(); | ||
| shape = polygon; | ||
| break; | ||
| } | ||
| this.geoFences.put(geoFence, new GeoFenceData(points, shape)); | ||
| } | ||
| } | ||
|
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| public boolean contains(GeoFence geoFence, Position position) { | ||
| GeoFenceData data = geoFences.get(geoFence); | ||
| switch (geoFence.getType()) { | ||
| case POLYGON: | ||
| return data.shape.contains(position.getLongitude(), position.getLatitude()); | ||
| case CIRCLE: | ||
| GeoFence.LonLat center = data.points.get(0); | ||
| return getDistance(position.getLongitude(), position.getLatitude(), center.lon, center.lat) <= geoFence.getRadius() / 1000; | ||
| case LINE: | ||
| GeoFence.LonLat prevPoint = null; | ||
| for (GeoFence.LonLat point : data.points) { | ||
| if (prevPoint != null) { | ||
| // from http://stackoverflow.com/questions/1459368/snap-point-to-a-line | ||
| double apx = position.getLongitude() - prevPoint.lon; | ||
| double apy = position.getLatitude() - prevPoint.lat; | ||
| double abx = point.lon - prevPoint.lon; | ||
| double aby = point.lat - prevPoint.lat; | ||
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| double ab2 = abx * abx + aby * aby; | ||
| double ap_ab = apx * abx + apy * aby; | ||
| double t = ap_ab / ab2; | ||
| if (t < 0) { | ||
| t = 0; | ||
| } else if (t > 1) { | ||
| t = 1; | ||
| } | ||
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| double destLon = prevPoint.lon + abx * t; | ||
| double destLat = prevPoint.lat + aby * t; | ||
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| if (getDistance(destLon, destLat, position.getLongitude(), position.getLatitude()) <= geoFence.getRadius() / 2000) { | ||
| return true; | ||
| } | ||
| } | ||
| prevPoint = point; | ||
| } | ||
| break; | ||
| } | ||
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| return false; | ||
| } | ||
| } |