code: public SVGPath quadTo(double c1x, double c1y, double x, double y) {
      return append(PATH_QUAD_TO).append(c1x).append(c1y).append(x).append(y);
    }
docs: Quadratic Bezier line to the given coordinates.
  
  @param c1x first control point x
  @param c1y first control point y
  @param x new coordinates
  @param y new coordinates
  @return path object, for compact syntax.