How to use

createShadow

method

in

org.jfree.chart.renderer.xy.GradientXYBarPainter

/**
 * Paints a single bar instance.
 *
 * @param g2  the graphics target.
 * @param renderer  the renderer.
 * @param row  the row index.
 * @param column  the column index.
 * @param bar  the bar
 * @param base  indicates which side of the rectangle is the base of the
 *              bar.
 * @param pegShadow  peg the shadow to the base of the bar?
 */
@Override
public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
    int column, RectangularShape bar, RectangleEdge base,
    boolean pegShadow) {
  // handle a special case - if the bar colour has alpha == 0, it is
  // invisible so we shouldn't draw any shadow
  Paint itemPaint = renderer.getItemPaint(row, column);
  if (itemPaint instanceof Color) {
    Color c = (Color) itemPaint;
    if (c.getAlpha() == 0) {
      return;
    }
  }
  RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
      renderer.getShadowYOffset(), base, pegShadow);
  g2.setPaint(Color.GRAY);
  g2.fill(shadow);
}

/**
 * Paints a single bar instance.
 *
 * @param g2  the graphics target.
 * @param renderer  the renderer.
 * @param row  the row index.
 * @param column  the column index.
 * @param bar  the bar
 * @param base  indicates which side of the rectangle is the base of the
 *              bar.
 * @param pegShadow  peg the shadow to the base of the bar?
 */
public void paintBarShadow(Graphics2D g2, XYBarRenderer renderer, int row,
    int column, RectangularShape bar, RectangleEdge base,
    boolean pegShadow) {
  // handle a special case - if the bar colour has alpha == 0, it is
  // invisible so we shouldn't draw any shadow
  Paint itemPaint = renderer.getItemPaint(row, column);
  if (itemPaint instanceof Color) {
    Color c = (Color) itemPaint;
    if (c.getAlpha() == 0) {
      return;
    }
  }
  RectangularShape shadow = createShadow(bar, renderer.getShadowXOffset(),
      renderer.getShadowYOffset(), base, pegShadow);
  g2.setPaint(Color.gray);
  g2.fill(shadow);
}