/**
* Constructs a PositionStep with specified image coordinates.
*
* @param track the PointMass track
* @param n the frame number
* @param x the x coordinate
* @param y the y coordinate
*/
public PositionStep(PointMass track, int n, double x, double y) {
super(track, n);
p = new Position(x, y);
p.setTrackEditTrigger(true);
points = new TPoint[] {p};
screenPoints = new Point[getLength()];
}
