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