Sets the join style for stroked lines and curves
style is one of :miter, :round, or :bevel
NOTE: if this method is never called, :miter will be used for join style throughout the document
# File lib/prawn/graphics/join_style.rb, line 20 def join_style(style=nil) return @join_style || :miter if style.nil? @join_style = style write_stroke_join_style end