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#--
# $Id: clippath.rb,v 1.5 2009/02/28 23:52:13 rmagick Exp $
# Copyright (C) 2009 Timothy P. Hunter
#++
module Magick
    class RVG

        class ClipPath
            include ShapeConstructors
            include UseConstructors
            include TextConstructors
            include Describable
            include Stylable
            include Duplicatable

            # Create a clipping path. Within the block create an outline
            # from one or more paths, basic shapes, text objects, or +use+.
            # Everything drawn within the outline will be displayed.
            # Anything drawn outside the outline will not.
            #
            # If the clipping path contains a +use+, it
            # must directly reference path, basic shape, or text objects.
            #
            # Attach the clipping path to an object with the :clip_path style.
            def initialize(clip_path_units='userSpaceOnUse')
                super()
                if ! ['userSpaceOnUse', 'objectBoundingBox'].include?(clip_path_units)
                    raise ArgumentError, "undefined value for clip path units: #{clip_path_units}"
                end
                @clip_path_units = clip_path_units
                @content = Content.new
                yield(self) if block_given?
            end

            def add_primitives(gc, style) #:nodoc:
                name = __id__.to_s
                gc.define_clip_path(name) do
                    gc.clip_units(@clip_path_units)
                    @content.each { |element| element.add_primitives(gc) }
                end
                gc.clip_path(name)
            end

        end # class ClipPath

    end # class RVG
end # module Magick

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