code: private void fillScrollBarButtonInteriorColors(Graphics2D g, Shape s, boolean isIncrease, boolean buttonsTogether) {
          g.setPaint(getScrollBarButtonBackgroundPaint(s, isIncrease, buttonsTogether));
          g.fill(s);
  
          int width = s.getBounds().width;
  
          g.setPaint(getScrollBarButtonLinePaint());
          g.drawLine(0, 0, width - 1, 0);
  
          if (state != Which.FOREGROUND_CAP && buttonsTogether) {
              int height = s.getBounds().height;
  
              g.setPaint(getScrollBarButtonDividerPaint(isIncrease));
              g.drawLine(width - 1, 1, width - 1, height - 1);
          }
      }
docs: DOCUMENT ME!
  
  @param g               DOCUMENT ME!
  @param s               DOCUMENT ME!
  @param isIncrease      DOCUMENT ME!
  @param buttonsTogether DOCUMENT ME!