code: private String getSVGFillStyle() {
          StringBuilder b = new StringBuilder();
          b.append("fill: ").append(svgColorStr()).append("; ");
          b.append("fill-opacity: ").append(getColorAlpha() * getAlpha());
          return b.toString();
      }
docs: Returns a fill style string based on the current paint and
  alpha settings.
  
  @return A fill style string.