class Magick::RVG::ClipPath

def add_primitives(gc, style) #:nodoc:

:nodoc: 
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

def initialize(clip_path_units='userSpaceOnUse')

Attach the clipping path to an object with the :clip_path style.

must directly reference path, basic shape, or text objects.
If the clipping path contains a +use+, it

Anything drawn outside the outline will not.
Everything drawn within the outline will be displayed.
from one or more paths, basic shapes, text objects, or +use+.
Create a clipping path. Within the block create an outline 
def initialize(clip_path_units='userSpaceOnUse')
    super()
    unless ['userSpaceOnUse', 'objectBoundingBox'].include?(clip_path_units)
        fail 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