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package tim.prune.function.compress.methods;
import tim.prune.data.DataPoint;
import tim.prune.data.MarkingData;
import tim.prune.data.NumberUtils;
import tim.prune.data.Track;
import tim.prune.function.compress.CompressionMethodType;
import tim.prune.function.compress.TrackDetails;
public class WackyPointsMethod extends CompressionMethod
{
private final double _factor;
public WackyPointsMethod(double factor) {
_factor = factor;
}
public WackyPointsMethod(String inString) {
_factor = NumberUtils.getDoubleOrZero(recogniseString(inString) ? inString.substring(4) : inString);
}
public CompressionMethodType getType() {
return CompressionMethodType.WACKY_POINTS;
}
public String getParam() {
return "" + Math.abs(_factor);
}
public int compress(Track inTrack, TrackDetails inDetails, MarkingData inMarkings)
{
if (_factor <= 0.0) {
return 0;
}
int numPoints = inTrack.getNumPoints();
int numDeleted = 0;
double threshold = _factor * inDetails.getMeanRadians();
DataPoint currPoint = null, prevPoint = null;
// Loop over all points looking for points far away from neighbours
for (int i=0; i<numPoints; i++)
{
if (inMarkings.isPointMarkedForDeletion(i)) {
continue;
}
currPoint = inTrack.getPoint(i);
// Don't delete any waypoints or photo points, or start/end of segments
if (!currPoint.isWaypoint() && !currPoint.hasMedia()
&& !inDetails.isSegmentStart(i) && !inDetails.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 = getNextTrackPoint(inTrack, i+1, inMarkings);
if (nextPoint != null && DataPoint.calculateRadiansBetween(currPoint, nextPoint) > threshold
&& DataPoint.calculateRadiansBetween(prevPoint, nextPoint) < threshold)
{
// Found a point to delete
inMarkings.markPointForDeletion(i);
numDeleted++;
}
}
}
// Remember last (not-deleted) track point
if (!currPoint.isWaypoint() && !inMarkings.isPointMarkedForDeletion(i)) {
prevPoint = currPoint;
}
}
return numDeleted;
}
public String getSettingsString() {
return getType().getKey() + _factor;
}
static boolean recogniseString(String inString) {
return recogniseString(inString, CompressionMethodType.WACKY_POINTS);
}
}
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