code: public void setDarkTextColor(final Color COLOR) {
          if (null == darkTextColor) {
              _darkTextColor = COLOR;
              if (isAutoTextColor()) {
                  adjustTextColors();
                  redraw();
              }
          } else {
              darkTextColor.set(COLOR);
          }
      }
docs: Defines the color that will be used by the autoTextColor feature as the dark text on bright segment fill colors
  @param COLOR