tim/prune/browser/UrlGenerator.java

   1 package tim.prune.browser;
   2
   3 import java.text.DecimalFormat;
   4 import java.text.NumberFormat;
   5 import java.util.Locale;
   6
   7 import tim.prune.I18nManager;
   8 import tim.prune.data.DataPoint;
   9 import tim.prune.data.DoubleRange;
  10 import tim.prune.data.TrackInfo;
  11
  12 /**
  13  * Class to manage the generation of map urls
  14  * for display in an external browser
  15  */
  16 public abstract class UrlGenerator
  17 {
  18         /** Number formatter for five dp */
  19         public static final NumberFormat FIVE_DP = NumberFormat.getNumberInstance(Locale.UK);
  20         // Select the UK locale for this formatter so that decimal point is always used (not comma)
  21         static {
  22                 if (FIVE_DP instanceof DecimalFormat) ((DecimalFormat) FIVE_DP).applyPattern("0.00000");
  23         }
  24
  25         /** Constant for Google Maps */
  26         public static final int MAP_SOURCE_GOOGLE = 0;
  27         /** Constant for Open Street Maps */
  28         public static final int MAP_SOURCE_OSM    = 1;
  29
  30         // TODO: Add other map sources, eg Yahoo, MSN, search.ch ?
  31
  32         /**
  33          * Generate a URL for the given source and track info
  34          * @param inSource source to use, either google or openstreetmap
  35          * @param inTrackInfo track info
  36          * @return url for map
  37          */
  38         public static String generateUrl(int inSource, TrackInfo inTrackInfo)
  39         {
  40                 if (inSource == MAP_SOURCE_GOOGLE) {
  41                         return generateGoogleUrl(inTrackInfo);
  42                 }
  43                 return generateOpenStreetMapUrl(inTrackInfo);
  44         }
  45
  46         /**
  47          * Generate a url for Google maps
  48          * @param inTrackInfo track information
  49          * @return URL
  50          */
  51         private static String generateGoogleUrl(TrackInfo inTrackInfo)
  52         {
  53                 // Check if any data to display
  54                 if (inTrackInfo == null || inTrackInfo.getTrack() == null || inTrackInfo.getTrack().getNumPoints() < 1)
  55                 {
  56                         return null;
  57                 }
  58                 double medianLat = getMedianValue(inTrackInfo.getTrack().getLatRange());
  59                 double medianLon = getMedianValue(inTrackInfo.getTrack().getLonRange());
  60                 double latSpan = getSpan(inTrackInfo.getTrack().getLatRange());
  61                 double lonSpan = getSpan(inTrackInfo.getTrack().getLonRange());
  62                 // Build basic url with centre position and span
  63                 String url = "http://" + I18nManager.getText("url.googlemaps")
  64                         + "/?ll=" + FIVE_DP.format(medianLat) + "," + FIVE_DP.format(medianLon)
  65                         + "&spn=" + FIVE_DP.format(latSpan) + "," + FIVE_DP.format(lonSpan);
  66                 DataPoint currPoint = inTrackInfo.getCurrentPoint();
  67                 // Add selected point, if any
  68                 if (currPoint != null) {
  69                         url = url + "&q=" + FIVE_DP.format(currPoint.getLatitude().getDouble()) + ","
  70                                 + FIVE_DP.format(currPoint.getLongitude().getDouble());
  71                         if (currPoint.getWaypointName() != null) {
  72                                 url = url + "(" + currPoint.getWaypointName() + ")";
  73                         }
  74                 }
  75                 //System.out.println(url);
  76                 return url;
  77         }
  78
  79         /**
  80          * Generate a url for Open Street Map
  81          * @param inTrackInfo track information
  82          * @return URL
  83          */
  84         private static String generateOpenStreetMapUrl(TrackInfo inTrackInfo)
  85         {
  86                 // Check if any data to display
  87                 if (inTrackInfo == null || inTrackInfo.getTrack() == null || inTrackInfo.getTrack().getNumPoints() < 1)
  88                 {
  89                         return null;
  90                 }
  91                 DoubleRange latRange = inTrackInfo.getTrack().getLatRange();
  92                 DoubleRange lonRange = inTrackInfo.getTrack().getLonRange();
  93                 // Build basic url using min and max lat and long
  94                 String url = "http://openstreetmap.org/?minlat=" + FIVE_DP.format(latRange.getMinimum())
  95                         + "&maxlat=" + FIVE_DP.format(latRange.getMaximum())
  96                         + "&minlon=" + FIVE_DP.format(lonRange.getMinimum()) + "&maxlon=" + FIVE_DP.format(lonRange.getMaximum());
  97                 DataPoint currPoint = inTrackInfo.getCurrentPoint();
  98                 // Add selected point, if any (no way to add point name?)
  99                 if (currPoint != null) {
 100                         url = url + "&mlat=" + FIVE_DP.format(currPoint.getLatitude().getDouble())
 101                                 + "&mlon=" + FIVE_DP.format(currPoint.getLongitude().getDouble());
 102                 }
 103                 return url;
 104         }
 105
 106         /**
 107          * Get the median value from the given lat/long range
 108          * @param inRange range of values
 109          * @return median value
 110          */
 111         private static double getMedianValue(DoubleRange inRange)
 112         {
 113                 return (inRange.getMaximum() + inRange.getMinimum()) / 2.0;
 114         }
 115
 116         /**
 117          * Get the span of the given lat/long range
 118          * @param inRange range of values
 119          * @return span
 120          */
 121         private static double getSpan(DoubleRange inRange)
 122         {
 123                 return inRange.getMaximum() - inRange.getMinimum();
 124         }
 125 }