Convert project to gradle

1 files changed, 53 insertions, 0 deletions

diff --git a/src/main/java/org/traccar/helper/DistanceCalculator.java b/src/main/java/org/traccar/helper/DistanceCalculator.java
new file mode 100644
index 000000000..88d4ef8a4
--- /dev/null
+++ b/src/main/java/org/traccar/helper/DistanceCalculator.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2014 - 2016 Anton Tananaev (anton@traccar.org)
+ * Copyright 2016 Andrey Kunitsyn (andrey@traccar.org)
+ *
+ * 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.helper;
+
+public final class DistanceCalculator {
+
+    private DistanceCalculator() {
+    }
+
+    private static final double EQUATORIAL_EARTH_RADIUS = 6378.1370;
+    private static final double DEG_TO_RAD = Math.PI / 180;
+
+    public static double distance(double lat1, double lon1, double lat2, double lon2) {
+        double dlong = (lon2 - lon1) * DEG_TO_RAD;
+        double dlat = (lat2 - lat1) * DEG_TO_RAD;
+        double a = Math.pow(Math.sin(dlat / 2), 2)
+                + Math.cos(lat1 * DEG_TO_RAD) * Math.cos(lat2 * DEG_TO_RAD) * Math.pow(Math.sin(dlong / 2), 2);
+        double c = 2 * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));
+        double d = EQUATORIAL_EARTH_RADIUS * c;
+        return d * 1000;
+    }
+
+    public static double distanceToLine(
+            double pointLat, double pointLon, double lat1, double lon1, double lat2, double lon2) {
+        double d0 = distance(pointLat, pointLon, lat1, lon1);
+        double d1 = distance(lat1, lon1, lat2, lon2);
+        double d2 = distance(lat2, lon2, pointLat, pointLon);
+        if (Math.pow(d0, 2) > Math.pow(d1, 2) + Math.pow(d2, 2)) {
+            return d2;
+        }
+        if (Math.pow(d2, 2) > Math.pow(d1, 2) + Math.pow(d0, 2)) {
+            return d0;
+        }
+        double halfP = (d0 + d1 + d2) * 0.5;
+        double area = Math.sqrt(halfP * (halfP - d0) * (halfP - d1) * (halfP - d2));
+        return 2 * area / d1;
+    }
+
+}