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package tim.prune.function.compress;
import java.awt.Component;
import java.awt.event.ActionListener;
import tim.prune.data.DataPoint;
import tim.prune.data.Track;
/**
* Algorithm for detecting duplicate points to compress
*/
public class DuplicatePointAlgorithm extends CompressionAlgorithm
{
/** Number of points before this one to consider as duplicates */
private static final int NUM_POINTS_TO_BACKTRACK = 20;
/**
* Constructor
* @param inTrack track object
* @param inDetails track details object
* @param inListener listener to attach to activation control
*/
public DuplicatePointAlgorithm(Track inTrack, TrackDetails inDetails, ActionListener inListener)
{
super(inTrack, inDetails, inListener);
}
/**
* Perform the compression and work out which points should be deleted
* @param inFlags deletion flags from previous algorithms
* @return number of points deleted
*/
protected int compress(boolean[] inFlags)
{
int numPoints = _track.getNumPoints();
int numDeleted = 0;
// Loop over all points looking for duplicates
for (int i=1; i<numPoints; i++)
{
// Don't delete points which are already marked as deleted
if (!inFlags[i])
{
DataPoint currPoint = _track.getPoint(i);
// Don't delete any photo points
if (currPoint.getPhoto() == null)
{
// loop over last few points before this one
for (int j=i-NUM_POINTS_TO_BACKTRACK; j<i; j++)
{
if (j<0) {j=0;} // only look at last few points, but not before 0
if (currPoint.isDuplicate(_track.getPoint(j)))
{
inFlags[i] = true;
numDeleted++;
break;
}
}
}
}
}
return numDeleted;
}
/**
* @return specific gui components for dialog
*/
protected Component getSpecificGuiComponents()
{
// no parameters to set, so no gui components
return null;
}
/**
* @return title key for box
*/
protected String getTitleTextKey()
{
return "dialog.compress.duplicates.title";
}
}
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