class Magick::RVG::Text

def initialize(x = 0, y = 0, text = nil, &block)

end
t.tspan("Blue text").styles(:fill=>'blue')
t.tspan("Red text").styles(:fill=>'red')
container.text(100, 100).styles(:font=>'Arial') do |t|

Text objects can contain Tspan objects.

container.text(100, 100, "Simple text").styles(:font=>'Arial')

Use the RVG::TextConstructors#text method to create Text objects in a container.
Define a text string starting at [x, y]. 
def initialize(x = 0, y = 0, text = nil, &block)
  @cx, @cy = Magick::RVG.convert_to_float(x, y)
  super(text, &block)
end

def tref(obj, x = nil, y = nil)

like x and y in RVG::TextBase#tspan
Reference a Tspan object. x and y are just 
def tref(obj, x = nil, y = nil)
  raise ArgumentError, "wrong argument type #{obj.class} (expected Tspan)" unless obj.is_a?(Tspan)
  obj = obj.deep_copy
  obj.parent = self
  tref = Tref.new(obj, x, y, self)
  @tspans << tref
  tref
end