tim/prune/gui/profile/SpeedData.java

   1 package tim.prune.gui.profile;
   2
   3 import tim.prune.I18nManager;
   4 import tim.prune.config.Config;
   5 import tim.prune.data.DataPoint;
   6 import tim.prune.data.Distance;
   7 import tim.prune.data.Track;
   8 import tim.prune.data.Distance.Units;
   9
  10 /**
  11  * Class to provide a source of speed data for the profile chart
  12  */
  13 public class SpeedData extends ProfileData
  14 {
  15         /** Flag for metric units */
  16         private boolean _metric = true;
  17
  18         /**
  19          * Constructor
  20          * @param inTrack track object
  21          */
  22         public SpeedData(Track inTrack) {
  23                 super(inTrack);
  24         }
  25
  26         /**
  27          * Get the data and populate the instance arrays
  28          */
  29         public void init()
  30         {
  31                 initArrays();
  32                 _metric = Config.getConfigBoolean(Config.KEY_METRIC_UNITS);
  33                 _hasData = false;
  34                 _minValue = _maxValue = 0.0;
  35                 if (_track != null) {
  36                         DataPoint prevPrevPoint = null, prevPoint = null, point = null;
  37                         for (int i=0; i<_track.getNumPoints(); i++)
  38                         {
  39                                 point = _track.getPoint(i);
  40                                 if (prevPrevPoint != null && prevPrevPoint.hasTimestamp()
  41                                         && prevPoint != null && prevPoint.hasTimestamp()
  42                                         && point != null && point.hasTimestamp())
  43                                 {
  44                                         // All three points have timestamps
  45                                         double seconds = point.getTimestamp().getSecondsSince(prevPrevPoint.getTimestamp());
  46                                         if (seconds > 0)
  47                                         {
  48                                                 double distInRads = DataPoint.calculateRadiansBetween(prevPrevPoint, prevPoint)
  49                                                         + DataPoint.calculateRadiansBetween(prevPoint, point);
  50                                                 double dist = Distance.convertRadiansToDistance(distInRads, _metric?Units.KILOMETRES:Units.MILES);
  51                                                 // Store the value and maintain max and min values
  52                                                 double value = dist / seconds * 60.0 * 60.0;
  53                                                 _pointValues[i-1] = value;
  54                                                 if (value < _minValue || _minValue == 0.0) {_minValue = value;}
  55                                                 if (value > _maxValue) {_maxValue = value;}
  56
  57                                                 _hasData = true;
  58                                                 _pointHasData[i-1] = true;
  59                                         }
  60                                 }
  61                                 // Exchange points
  62                                 prevPrevPoint = prevPoint;
  63                                 prevPoint = point;
  64                         }
  65                 }
  66         }
  67
  68         /**
  69          * @return text description including units
  70          */
  71         public String getLabel()
  72         {
  73                 return I18nManager.getText("fieldname.speed") + " ("
  74                         + I18nManager.getText(_metric?"units.kmh":"units.mph") + ")";
  75         }
  76
  77         /**
  78          * @return key for message when no speeds present
  79          */
  80         public String getNoDataKey() {
  81                 return "display.notimestamps";
  82         }
  83 }