class Magick::RVG::PolyShape

def polypoints(points)
  case points.length
  when 1
    points = Array(points[0])
  when 2
    x_coords = Array(points[0])
    y_coords = Array(points[1])
    raise ArgumentError, 'array arguments must contain at least one point' unless !x_coords.empty? && !y_coords.empty?
    n = x_coords.length - y_coords.length
    short = n > 0 ? y_coords : x_coords
    olen = short.length
    n.abs.times { |x| short << short[x % olen] }
    points = x_coords.zip(y_coords).flatten!
  end
  n = points.length
  raise ArgumentError, "insufficient/odd number of points specified: #{n}" if n < 4 || n.odd?
  Magick::RVG.convert_to_float(*points)
end