tim/prune/browser/UrlGenerator.java

   1 package tim.prune.browser;
   2
   3 import java.text.DecimalFormat;
   4
   5 import tim.prune.I18nManager;
   6 import tim.prune.data.DataPoint;
   7 import tim.prune.data.DoubleRange;
   8 import tim.prune.data.TrackInfo;
   9
  10 /**
  11  * Class to manage the generation of map urls
  12  * for display in an external browser
  13  */
  14 public abstract class UrlGenerator
  15 {
  16         /** Number formatter for five dp */
  17         public static final DecimalFormat FIVE_DP = new DecimalFormat("0.00000");
  18
  19         /** Constant for Google Maps */
  20         public static final int MAP_SOURCE_GOOGLE = 0;
  21         /** Constant for Open Street Maps */
  22         public static final int MAP_SOURCE_OSM    = 1;
  23
  24         // TODO: Add other map sources, eg Yahoo, MSN, search.ch ?
  25
  26         /**
  27          * Generate a URL for the given source and track info
  28          * @param inSource source to use, either google or openstreetmap
  29          * @param inTrackInfo track info
  30          * @return url for map
  31          */
  32         public static String generateUrl(int inSource, TrackInfo inTrackInfo)
  33         {
  34                 if (inSource == MAP_SOURCE_GOOGLE) {
  35                         return generateGoogleUrl(inTrackInfo);
  36                 }
  37                 return generateOpenStreetMapUrl(inTrackInfo);
  38         }
  39
  40         /**
  41          * Generate a url for Google maps
  42          * @param inTrackInfo track information
  43          * @return URL
  44          */
  45         private static String generateGoogleUrl(TrackInfo inTrackInfo)
  46         {
  47                 // Check if any data to display
  48                 if (inTrackInfo == null || inTrackInfo.getTrack() == null || inTrackInfo.getTrack().getNumPoints() < 1)
  49                 {
  50                         return null;
  51                 }
  52                 double medianLat = getMedianValue(inTrackInfo.getTrack().getLatRange());
  53                 double medianLon = getMedianValue(inTrackInfo.getTrack().getLonRange());
  54                 double latSpan = getSpan(inTrackInfo.getTrack().getLatRange());
  55                 double lonSpan = getSpan(inTrackInfo.getTrack().getLonRange());
  56                 // Build basic url with centre position and span
  57                 String url = "http://" + I18nManager.getText("url.googlemaps")
  58                         + "/?ll=" + FIVE_DP.format(medianLat) + "," + FIVE_DP.format(medianLon)
  59                         + "&spn=" + FIVE_DP.format(latSpan) + "," + FIVE_DP.format(lonSpan);
  60                 DataPoint currPoint = inTrackInfo.getCurrentPoint();
  61                 // Add selected point, if any
  62                 if (currPoint != null) {
  63                         url = url + "&q=" + FIVE_DP.format(currPoint.getLatitude().getDouble()) + ","
  64                                 + FIVE_DP.format(currPoint.getLongitude().getDouble());
  65                         if (currPoint.getWaypointName() != null) {
  66                                 url = url + "(" + currPoint.getWaypointName() + ")";
  67                         }
  68                 }
  69                 return url;
  70         }
  71
  72         /**
  73          * Generate a url for Open Street Map
  74          * @param inTrackInfo track information
  75          * @return URL
  76          */
  77         private static String generateOpenStreetMapUrl(TrackInfo inTrackInfo)
  78         {
  79                 // Check if any data to display
  80                 if (inTrackInfo == null || inTrackInfo.getTrack() == null || inTrackInfo.getTrack().getNumPoints() < 1)
  81                 {
  82                         return null;
  83                 }
  84                 DoubleRange latRange = inTrackInfo.getTrack().getLatRange();
  85                 DoubleRange lonRange = inTrackInfo.getTrack().getLonRange();
  86                 // Build basic url using min and max lat and long
  87                 String url = "http://openstreetmap.org/?minlat=" + FIVE_DP.format(latRange.getMinimum())
  88                         + "&maxlat=" + FIVE_DP.format(latRange.getMaximum())
  89                         + "&minlon=" + FIVE_DP.format(lonRange.getMinimum()) + "&maxlon=" + FIVE_DP.format(lonRange.getMaximum());
  90                 DataPoint currPoint = inTrackInfo.getCurrentPoint();
  91                 // Add selected point, if any (no way to add point name?)
  92                 if (currPoint != null) {
  93                         url = url + "&mlat=" + FIVE_DP.format(currPoint.getLatitude().getDouble())
  94                                 + "&mlon=" + FIVE_DP.format(currPoint.getLongitude().getDouble());
  95                 }
  96                 return url;
  97         }
  98
  99         /**
 100          * Get the median value from the given lat/long range
 101          * @param inRange range of values
 102          * @return median value
 103          */
 104         private static double getMedianValue(DoubleRange inRange)
 105         {
 106                 return (inRange.getMaximum() + inRange.getMinimum()) / 2.0;
 107         }
 108
 109         /**
 110          * Get the span of the given lat/long range
 111          * @param inRange range of values
 112          * @return span
 113          */
 114         private static double getSpan(DoubleRange inRange)
 115         {
 116                 return inRange.getMaximum() - inRange.getMinimum();
 117         }
 118 }