code: private void paintProgressIndicator(SeaGlassContext context, Graphics2D g2d, int width, int height, int size, boolean isFinished) {
          JProgressBar pBar = (JProgressBar) context.getComponent();
  
          if (tileWhenIndeterminate && pBar.isIndeterminate()) {
              double offsetFraction = (double) getAnimationIndex() / (double) getFrameCount();
              int offset = (int) (offsetFraction * tileWidth);
              if (pBar.getOrientation() == JProgressBar.HORIZONTAL) {
                  // If we're right-to-left, flip the direction of animation.
                  if (!SeaGlassLookAndFeel.isLeftToRight(pBar)) {
                      offset = tileWidth - offset;
                  }
                  // paint each tile horizontally
                  for (int i = -tileWidth + offset; i <= width; i += tileWidth) {
                      context.getPainter().paintProgressBarForeground(context, g2d, i, 0, tileWidth, height, pBar.getOrientation());
                  }
              } else {
                  // paint each tile vertically
                  for (int i = -offset; i < height + tileWidth; i += tileWidth) {
                      context.getPainter().paintProgressBarForeground(context, g2d, 0, i, width, tileWidth, pBar.getOrientation());
                  }
              }
          } else {
              if (pBar.getOrientation() == JProgressBar.HORIZONTAL) {
                  int start = 0;
                  if (isFinished) {
                      size = width;
                  } else if (!SeaGlassLookAndFeel.isLeftToRight(pBar)) {
                      start = width - size;
                  }
                  context.getPainter().paintProgressBarForeground(context, g2d, start, 0, size, height, pBar.getOrientation());
              } else {
                  // When the progress bar is vertical we always paint from bottom
                  // to top, not matter what the component orientation is.
                  int start = height;
                  if (isFinished) {
                      size = height;
                  }
                  context.getPainter().paintProgressBarForeground(context, g2d, 0, start, width, size, pBar.getOrientation());
              }
          }
      }
docs: Paint the actual internal progress bar.
  
  @param context
  @param g2d
  @param width
  @param height
  @param size
  @param isFinished