PDF::Writer：#scurve_to

「scurve」の「s」は「spline」？

require 'pdf/writer'

pdf = PDF::Writer.new

pdf.move_to(50,50)
pdf.scurve_to(350, 0, 400, 45).stroke

File.open("2008011900.pdf", "wb") { |f| f.write pdf.render }