code: public SVGPath cubicTo(double[] c1xy, double[] c2xy, double[] xy) {
      return append(PATH_CUBIC_TO).append(c1xy[0]).append(c1xy[1]).append(c2xy[0]).append(c2xy[1]).append(xy[0]).append(xy[1]);
    }
docs: Cubic Bezier line to the given coordinates.
  
  @param c1xy first control point
  @param c2xy second control point
  @param xy new coordinates
  @return path object, for compact syntax.