tim/prune/undo/UndoInterpolate.java

   1 package tim.prune.undo;\r
   2 \r
   3 import tim.prune.I18nManager;\r
   4 import tim.prune.data.DataPoint;\r
   5 import tim.prune.data.TrackInfo;\r
   6 \r
   7 /**\r
   8  * Operation to undo an interpolation\r
   9  */\r
  10 public class UndoInterpolate implements UndoOperation\r
  11 {\r
  12         private int _startIndex = 0;\r
  13         private int _totalInserted = 0;\r
  14         private DataPoint[] _points = null;\r
  15 \r
  16 \r
  17         /**\r
  18          * Constructor\r
  19          * @param inTrackInfo track info object\r
  20          * @param inTotalInserted total number of points inserted\r
  21          */\r
  22         public UndoInterpolate(TrackInfo inTrackInfo, int inTotalInserted)\r
  23         {\r
  24                 _startIndex = inTrackInfo.getSelection().getStart();\r
  25                 _points = inTrackInfo.cloneSelectedRange();\r
  26                 _totalInserted = inTotalInserted;\r
  27         }\r
  28 \r
  29 \r
  30         /**\r
  31          * @return description of operation including parameters\r
  32          */\r
  33         public String getDescription()\r
  34         {\r
  35                 return I18nManager.getText("undo.insert") + " (" + _totalInserted + ")";\r
  36         }\r
  37 \r
  38 \r
  39         /**\r
  40          * Perform the undo operation on the given TrackInfo\r
  41          * @param inTrackInfo TrackInfo object on which to perform the operation\r
  42          */\r
  43         public void performUndo(TrackInfo inTrackInfo) throws UndoException\r
  44         {\r
  45                 // Work out how many points were in the track before the interpolation\r
  46                 final int newSize = inTrackInfo.getTrack().getNumPoints() - _totalInserted;\r
  47                 DataPoint[] oldPoints = inTrackInfo.getTrack().cloneContents();\r
  48                 DataPoint[] newPoints = new DataPoint[newSize];\r
  49 \r
  50                 // Restore track to previous values\r
  51                 System.arraycopy(oldPoints, 0, newPoints, 0, _startIndex);\r
  52                 System.arraycopy(_points, 0, newPoints, _startIndex, _points.length);\r
  53                 int endIndex = _startIndex + _points.length;\r
  54                 System.arraycopy(oldPoints, endIndex + _totalInserted, newPoints, endIndex, newSize - endIndex);\r
  55 \r
  56                 inTrackInfo.getTrack().replaceContents(newPoints);\r
  57                 // reset selection\r
  58                 inTrackInfo.getSelection().clearAll();\r
  59         }\r
  60 }\r