tim/prune/undo/UndoAddAltitudeOffset.java

   1 package tim.prune.undo;
   2
   3 import tim.prune.I18nManager;
   4 import tim.prune.UpdateMessageBroker;
   5 import tim.prune.data.Altitude;
   6 import tim.prune.data.DataPoint;
   7 import tim.prune.data.TrackInfo;
   8
   9 /**
  10  * Undo addition/subtraction of an altitude offset
  11  */
  12 public class UndoAddAltitudeOffset implements UndoOperation
  13 {
  14         /** Start index of section */
  15         private int _startIndex;
  16         /** altitude values before operation */
  17         private Altitude[] _altitudes;
  18
  19
  20         /**
  21          * Constructor
  22          * @param inTrackInfo track info object
  23          */
  24         public UndoAddAltitudeOffset(TrackInfo inTrackInfo)
  25         {
  26                 _startIndex = inTrackInfo.getSelection().getStart();
  27                 final int endIndex = inTrackInfo.getSelection().getEnd();
  28                 final int numPoints = endIndex - _startIndex + 1;
  29                 // Make array of cloned altitude objects
  30                 _altitudes = new Altitude[numPoints];
  31                 for (int i=0; i<numPoints; i++) {
  32                         Altitude a = inTrackInfo.getTrack().getPoint(_startIndex+i).getAltitude();
  33                         if (a != null && a.isValid()) {
  34                                 _altitudes[i] = a.clone();
  35                         }
  36                 }
  37         }
  38
  39
  40         /**
  41          * @return description of operation including number of points adjusted
  42          */
  43         public String getDescription()
  44         {
  45                 return I18nManager.getText("undo.addaltitudeoffset") + " (" + (_altitudes.length) + ")";
  46         }
  47
  48
  49         /**
  50          * Perform the undo operation on the given Track
  51          * @param inTrackInfo TrackInfo object on which to perform the operation
  52          */
  53         public void performUndo(TrackInfo inTrackInfo) throws UndoException
  54         {
  55                 // Perform the inverse operation
  56                 final int numPoints = _altitudes.length;
  57                 for (int i=0; i<numPoints; i++)
  58                 {
  59                         DataPoint point = inTrackInfo.getTrack().getPoint(i+_startIndex);
  60                         point.getAltitude().reset(_altitudes[i]);
  61                         point.setModified(true);
  62                 }
  63                 _altitudes = null;
  64                 inTrackInfo.getSelection().markInvalid();
  65                 UpdateMessageBroker.informSubscribers();
  66         }
  67 }