code: private void paintBorder(SynthContext ctx, Graphics g, int x, int y, int w, int h, AffineTransform transform) {
          SeaGlassPainter borderPainter = style.getBorderPainter(ctx);
  
          if (borderPainter != null) {
              paint(borderPainter, ctx, g, x, y, w, h, transform);
          }
      }
docs: Paint the object's border.
  
  @param ctx       the SynthContext.
  @param g         the Graphics context.
  @param x         the x location corresponding to the upper-left
  coordinate to paint.
  @param y         the y location corresponding to the upper left
  coordinate to paint.
  @param w         the width to paint.
  @param h         the height to paint.
  @param transform the affine transform to apply, or {@code null} if none
  is to be applied.