prawn:Prawn::Graphics::CapStyle::CAP_STYLES
#!/usr/bin/env ruby require "prawn" pdf = Prawn::Document.new p Prawn::Document::CapStyle::CAP_STYLES p Prawn::Document::CAP_STYLES
で、
{:round=>1, :butt=>0, :projecting_square=>2} {:round=>1, :butt=>0, :projecting_square=>2}