# encoding: utf-8

# join_style.rb : Implements stroke join styling
#
# Contributed by Daniel Nelson. October, 2009
#
# This is free software. Please see the LICENSE and COPYING files for details.
#
module Prawn
  module Graphics
    module JoinStyle
      JOIN_STYLES = { :miter => 0, :round => 1, :bevel => 2 }

      # @group Stable API

      # 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
      #
      def join_style(style = nil)
        return current_join_style || :miter if style.nil?

        self.current_join_style = style

        write_stroke_join_style
      end

      alias_method :join_style=, :join_style

      private

      def current_join_style
        graphic_state.join_style
      end

      def current_join_style=(style)
        graphic_state.join_style = style
      end

      def write_stroke_join_style
        renderer.add_content "#{JOIN_STYLES[current_join_style]} j"
      end
    end
  end
end
