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