code: protected static final Stroke checkerStrokeForSize(int size) {
  		return new BasicStroke(size, BasicStroke.CAP_SQUARE, BasicStroke.JOIN_BEVEL, 1, new float[]{0,size*2}, 0);
  	}
docs: Creates a stroke for a checkerboard pattern with specified size. <br>
  This is used by {@link #setCheckerSize(int)}
  @param size width of the stroke
  @return the stroke
  @since 1.4