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package tim.prune.data;
/**
* Class to manage the scaling of points, used by the ThreeDModel
*/
public class PointScaler
{
/** Original data */
private Track _track = null;
/** Secondary data for terrain grid */
private Track _terrainTrack = null;
// Scaled values for data track
private double[] _xValues = null;
private double[] _yValues = null;
private double[] _altValues = null;
// Scaled values for terrain track, if any
private double[] _terrainxValues = null;
private double[] _terrainyValues = null;
private double[] _terrainAltValues = null;
// Altitude range
private double _altitudeRange = 0.0;
private double _minAltitudeMetres = 0.0;
// Horizontal distance
private double _horizDistanceMetres = 0.0;
/**
* Constructor
* @param inTrack Track object
*/
public PointScaler(Track inTrack)
{
_track = inTrack;
}
/**
* @param inTrack terrain track to add
*/
public void addTerrain(Track inTrack)
{
_terrainTrack = inTrack;
}
/**
* Scale the points
*/
public void scale()
{
// Work out extents
TrackExtents extents = new TrackExtents(_track);
extents.applySquareBorder();
_horizDistanceMetres = Math.max(extents.getHorizontalDistanceMetres(), 1.0);
final int numPoints = _track.getNumPoints();
// Find altitude range (including terrain)
DoubleRange altRangeMetres = extents.getAltitudeRange();
if (_terrainTrack != null) {
altRangeMetres.combine(new TrackExtents(_terrainTrack).getAltitudeRange());
}
_altitudeRange = altRangeMetres.getRange() / _horizDistanceMetres;
_minAltitudeMetres = altRangeMetres.getMinimum();
// create new arrays for scaled values
if (_xValues == null || _xValues.length != numPoints)
{
_xValues = new double[numPoints];
_yValues = new double[numPoints];
_altValues = new double[numPoints];
if (_terrainTrack != null)
{
_terrainxValues = new double[_terrainTrack.getNumPoints()];
_terrainyValues = new double[_terrainTrack.getNumPoints()];
_terrainAltValues = new double[_terrainTrack.getNumPoints()];
}
}
final double midXvalue = extents.getXRange().getMidValue();
final double midYvalue = extents.getYRange().getMidValue();
final double xyRange = extents.getXRange().getRange();
// Calculate scaled values
for (int p=0; p<numPoints; p++)
{
DataPoint point = _track.getPoint(p);
if (point != null)
{
_xValues[p] = (_track.getX(p) - midXvalue) / xyRange;
_yValues[p] = (midYvalue - _track.getY(p)) / xyRange; // y values have to be inverted
_altValues[p] = (point.getAltitude().getMetricValue() - _minAltitudeMetres) / _horizDistanceMetres;
}
}
if (_terrainTrack != null)
{
for (int p=0; p<_terrainTrack.getNumPoints(); p++)
{
_terrainxValues[p] = (_terrainTrack.getX(p) - midXvalue) / xyRange;
_terrainyValues[p] = (midYvalue - _terrainTrack.getY(p)) / xyRange; // y values have to be inverted
_terrainAltValues[p] = (_terrainTrack.getPoint(p).getAltitude().getMetricValue() - _minAltitudeMetres) / _horizDistanceMetres;
}
}
}
/**
* Get the horizontal value for the specified point
* @param inIndex index of point, starting at 0
* @return scaled horizontal value
*/
public double getHorizValue(int inIndex)
{
return _xValues[inIndex];
}
/**
* Get the vertical value for the specified point
* @param inIndex index of point, starting at 0
* @return scaled vertical value
*/
public double getVertValue(int inIndex)
{
return _yValues[inIndex];
}
/**
* Get the altitude value for the specified point
* @param inIndex index of point, starting at 0
* @return scaled altitude value
*/
public double getAltValue(int inIndex)
{
return _altValues[inIndex];
}
/**
* @return altitude range as fraction of horizontal range
*/
public double getAltitudeRange()
{
return _altitudeRange;
}
/**
* Get the horizontal value for the specified point
* @param inIndex index of point, starting at 0
* @return scaled horizontal value
*/
public double getTerrainHorizValue(int inIndex)
{
return _terrainxValues[inIndex];
}
/**
* Get the vertical value for the specified point
* @param inIndex index of point, starting at 0
* @return scaled vertical value
*/
public double getTerrainVertValue(int inIndex)
{
return _terrainyValues[inIndex];
}
/**
* @param inIndex index of point in terrain track
* @return scaled altitude value for the specified terrain point
*/
public double getTerrainAltValue(int inIndex)
{
if (_terrainAltValues != null) {
return _terrainAltValues[inIndex];
}
return 0.0;
}
}
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