code: public SVGPath relativeEllipticalArc(double rx, double ry, double ar, double la, double sp, double x, double y) {
      return append(PATH_ARC_RELATIVE).append(rx).append(ry).append(ar).append(la).append(sp).append(x).append(y);
    }
docs: Elliptical arc curve to the given relative coordinates.
  
  @param rx x radius
  @param ry y radius
  @param ar x-axis-rotation
  @param la large arc flag, if angle &gt;= 180 deg
  @param sp sweep flag, if arc will be drawn in positive-angle direction
  @param x new coordinates
  @param y new coordinates