protected BaseTile computeFringeTile (int tx, int ty)
    {
        return _panel == null ? null : _panel.computeFringeTile(tx, ty);
    }
protected BaseTile computeFringeTile ( int tx , int ty ) { return _panel == null ? null : _panel . computeFringeTile ( tx , ty ) ; }
Computes the fringe tile for the specified coordinate.