prawn:Prawn::Document::BoundingBox#top_right
#!/usr/bin/env ruby require "prawn" pdf = Prawn::Document.new p pdf.bounds.top_right
で、
[540.0, 720.0]
#!/usr/bin/env ruby require "prawn" pdf = Prawn::Document.new p pdf.bounds.top_right
で、
[540.0, 720.0]