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