public static final Stroke DEFAULT_GRIDLINE_STROKE = new BasicStroke(
            0.5f, BasicStroke.CAP_BUTT, BasicStroke.JOIN_BEVEL,
            0.0f, new float[]{2.0f, 2.0f}, 0.0f);

    /** The default grid line paint. */
    public static final Paint DEFAULT_GRIDLINE_PAINT = Color.gray;