libharu:HPDFPage#circle
#!/usr/bin/env ruby require "hpdf" pdf = HPDFDoc.new page = pdf.add_page page.circle(100, 100, 100) page.fill page.circle(300, 100, 50) page.stroke page.circle(200, 500, 10) page.stroke pdf.save_to_file(File.basename($0, ".rb") + ".pdf")