libharu：HPDFAnnotation#set_border_style

#!/usr/bin/env ruby

require "hpdf"

pdf  = HPDFDoc.new
page = pdf.add_page
#page2 = pdf.add_page
#dst = page2.create_destination()

# NG
#a = page.create_text_annot(0, 0, 100, 100, "foo", pdf.get_current_encoder)

#a = page.create_link_annot(0, 0, 100, 100, dst)
a = page.create_uri_link_annot(0, 0, 100, 100, "http://libharu.org/")
a.set_border_style(10, 5, 0)

pdf.save_to_file(File.basename($0, ".rb") + ".pdf")

第2, 3引数の意味不明