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121 lines
3.9 KiB
121 lines
3.9 KiB
package org.r3pek.pharmacies.utils;
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/*
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* Copyright (C) 2008 Google Inc.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.io.IOException;
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import java.util.List;
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import org.r3pek.pharmacies.R;
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import android.content.Context;
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import android.location.Address;
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import android.location.Geocoder;
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import android.os.Bundle;
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import android.os.Handler;
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import android.os.Message;
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import com.google.android.maps.GeoPoint;
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/**
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* Library for some use useful latitude/longitude math
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*/
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public class GeoUtils {
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private static double MILLION = 1000000;
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/**
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* Computes the bearing in degrees between two points on Earth.
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*
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* @param lat1 Latitude of the first point
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* @param lon1 Longitude of the first point
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* @param lat2 Latitude of the second point
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* @param lon2 Longitude of the second point
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* @return Bearing between the two points in degrees. A value of 0 means due
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* north.
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*/
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public static float bearing(double lat1, double lon1, double lat2, double lon2) {
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double lat1Rad = Math.toRadians(lat1);
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double lat2Rad = Math.toRadians(lat2);
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double deltaLonRad = Math.toRadians(lon2 - lon1);
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double y = Math.sin(deltaLonRad) * Math.cos(lat2Rad);
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double x = Math.cos(lat1Rad) * Math.sin(lat2Rad) - Math.sin(lat1Rad) * Math.cos(lat2Rad)
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* Math.cos(deltaLonRad);
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return radToBearing(Math.atan2(y, x));
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}
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/**
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* Computes the bearing in degrees between two points on Earth.
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*
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* @param p1 First point
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* @param p2 Second point
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* @return Bearing between the two points in degrees. A value of 0 means due
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* north.
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*/
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public static float bearing(GeoPoint p1, GeoPoint p2) {
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double lat1 = p1.getLatitudeE6() / MILLION;
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double lon1 = p1.getLongitudeE6() / MILLION;
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double lat2 = p2.getLatitudeE6() / MILLION;
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double lon2 = p2.getLongitudeE6() / MILLION;
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return bearing(lat1, lon1, lat2, lon2);
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}
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/**
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* Converts an angle in radians to degrees
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*/
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public static float radToBearing(double rad) {
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return (float) ((Math.toDegrees(rad) + 360) % 360);
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}
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/**
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* Returns the current's location address
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*/
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public static void getLocationName(final Context context, final Handler h) {
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Runnable r = new Runnable() {
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@Override
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public void run() {
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Geocoder g = new Geocoder(context);
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Message m = new Message();
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Bundle b = new Bundle();
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List<Address> addresses = null;
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try {
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addresses = g.getFromLocation(GlobalVars.positioner.getLastLocation().getLatitude(), GlobalVars.positioner.getLastLocation().getLongitude(), 1);
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} catch (IOException e) { }
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if (addresses == null || addresses.size() == 0) {
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b.putString("location", context.getString(R.string.not_available));
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m.setData(b);
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h.dispatchMessage(m);
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}
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String result = "";
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for (int i = 0; i <= addresses.get(0).getMaxAddressLineIndex(); i++)
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result += addresses.get(0).getAddressLine(i) + ", ";
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if (result.equals(""))
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b.putString("location", context.getString(R.string.not_available));
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else
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b.putString("location", result.substring(0, result.length() - 2));
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m.setData(b);
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h.dispatchMessage(m);
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}
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};
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Thread t = new Thread(r);
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t.start();
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}
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} |