# -
# $Id: container.rb,v 1.5 2009/02/28 23:52:13 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
# +
module Magick
  class RVG
    # Content is simply an Array with a deep_copy method.
    # When unit-testing, it also has a deep_equal method.
    # @private
    class Content < Array[untyped]
      include _Duplicatable
    end

    # Define a collection of shapes, text, etc. that can be reused.
    # Group objects are _containers_. That is, styles and transforms defined
    # on the group are used by contained objects such as shapes, text, and
    # nested groups unless overridden by a nested container or the object itself.
    # Groups can be reused with the RVG::UseConstructors#use method.
    # Create groups within
    # containers with the RVG::StructureConstructors#g method.
    #
    # Example:
    #   # All elements in the group will be translated by 50 in the
    #   # x-direction and 10 in the y-direction.
    #   rvg.g.translate(50, 10).styles(:stroke=>'red',:fill=>'none') do |grp|
    #       # The line will be red.
    #       grp.line(10,10, 20,20)
    #       # The circle will be blue.
    #       grp.circle(10, 20, 20).styles(:stroke=>'blue')
    #   end
    class Group
      @content: Content

      include Stylable
      include Transformable
      include Embellishable
      include Describable
      include Duplicatable

      def initialize: () -> void
                    | () { (Group) -> void } -> void

      # @private
      def add_primitives: (Utility::GraphicContext gc) -> void

      # Translate container according to #use arguments
      # @private
      def ref: (magick_real x, magick_real y, untyped _width, untyped _height) -> void

      # Append an arbitrary object to the group's content. Called
      # by #use to insert a non-container object into a group.
      # @private
      def <<: (_Duplicatable obj) -> void
    end

    # A Use object allows the re-use of RVG and RVG::Group
    # objects within a container. Create a Use object with the
    # RVG::UseConstructors#use method.
    class Use
      @element: Group

      include Stylable
      include Transformable
      include Duplicatable

      # In a container, Use objects are created indirectly via the
      # RVG::UseConstructors#use method.
      # The +x+ and +y+ arguments
      # can be used to specify an additional translation for
      # the group. The +width+ and +height+ arguments specify
      # a width and height for referenced RVG objects.
      def initialize: (_Duplicatable element, ?magick_real x, ?magick_real y, ?magick_real? width, ?magick_real? height) -> void

      # @private
      def add_primitives: (Utility::GraphicContext gc) -> void
    end
  end
end