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1   /*
2    * $Id: CityStroller.java 20321 2010-11-24 15:21:24Z dfeist $
3    * --------------------------------------------------------------------------------------
4    * Copyright (c) MuleSoft, Inc.  All rights reserved.  http://www.mulesoft.com
5    *
6    * The software in this package is published under the terms of the CPAL v1.0
7    * license, a copy of which has been included with this distribution in the
8    * LICENSE.txt file.
9    */
10  package org.mule.example.gpswalker;
11  
12  import org.mule.api.annotations.Schedule;
13  
14  import edu.emory.mathcs.backport.java.util.concurrent.atomic.AtomicBoolean;
15  
16  /**
17   * Generates a random walk around a city
18   */
19  public class CityStroller
20  {
21  
22      public static final GpsCoord SAN_FRANCISCO = new GpsCoord(37.789167f, -122.419281f);
23      public static final GpsCoord LONDON = new GpsCoord(37.788423f, -122.39823f);
24      public static final GpsCoord VALLETTA = new GpsCoord(35.898504f, 14.514313f);
25  
26  
27      private volatile GpsCoord currentCoord = SAN_FRANCISCO;
28      private AtomicBoolean firstTime = new AtomicBoolean(true);
29  
30      //could use a better algorithm here or real test data for better results
31      public GpsCoord generateNextCoord()
32      {
33          if (firstTime.get())
34          {
35              firstTime.set(false);
36          }
37          else
38          {
39              double dist = Math.random() * 0.002;
40              double angle = Math.random() * Math.PI;
41  
42  
43              float lat = currentCoord.getLatitude() + (float) (dist * Math.sin(angle));
44              float lng = currentCoord.getLongitude() + (float) (dist * Math.cos(angle));
45  
46              currentCoord = new GpsCoord(lat, lng);
47          }
48          return currentCoord;
49      }
50  
51      public GpsCoord getCurrentCoord()
52      {
53          return currentCoord;
54      }
55  
56      public void setCurrentCoord(GpsCoord currentCoord)
57      {
58          this.currentCoord = currentCoord;
59          firstTime.set(false);
60      }
61  }