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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 wacky points to compress
*/
public class WackyPointAlgorithm extends SingleParameterAlgorithm
{
/**
* Constructor
* @param inTrack track object
* @param inDetails track details object
* @param inListener listener to attach to activation control
*/
public WackyPointAlgorithm(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)
{
double param = getParameter();
if (param <= 0.0) return 0;
int numPoints = _track.getNumPoints();
int numDeleted = 0;
double threshold = param * _trackDetails.getMeanRadians();
DataPoint currPoint = null, prevPoint = null;
// Loop over all points looking for points far away from neighbours
for (int i=0; i<numPoints; i++)
{
currPoint = _track.getPoint(i);
// Don't delete points which are already marked as deleted
if (!inFlags[i])
{
// Don't delete any waypoints or photo points, or start/end of segments
if (!currPoint.isWaypoint() && currPoint.getPhoto() == null
&& !_trackDetails.isSegmentStart(i) && !_trackDetails.isSegmentEnd(i))
{
// Measure distance from previous track point
if (DataPoint.calculateRadiansBetween(prevPoint, currPoint) > threshold)
{
// Now need to find next track point, and measure distances
DataPoint nextPoint = _track.getNextTrackPoint(i+1);
if (nextPoint != null && DataPoint.calculateRadiansBetween(currPoint, nextPoint) > threshold
&& DataPoint.calculateRadiansBetween(prevPoint, nextPoint) < threshold)
{
// Found a point to delete (hope that next point hasn't been deleted already)
inFlags[i] = true;
numDeleted++;
}
}
}
// Remember last (not-deleted) track point
if (!currPoint.isWaypoint()) {prevPoint = currPoint;}
}
}
return numDeleted;
}
/**
* @return specific gui components for dialog
*/
protected Component getSpecificGuiComponents()
{
return getSpecificGuiComponents("dialog.compress.wackypoints.paramdesc", "2");
}
/**
* @return title key for box
*/
protected String getTitleTextKey()
{
return "dialog.compress.wackypoints.title";
}
}
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