How do I define line height with Prawn when generating a pdf in rails app?

I am usi开发者_开发问答ng prawn to generate a pdf. So far everything has been rather straight forward. I am having a problem defining the leading between lines of text. For example: when using a text_box

pdf.text_box "Ipsum dolor sit amet consectetue?",
  :width    => pdf.bounds.width - 10, :height => 150,
  :overflow => :ellipses

This will generate the text box except I can not find in the docs on how to control the spacing between lines of text. The strings I will be using are typically 5 to 8 lines long.

Thank you in advance

---

I know this isn't the perfect answer, but you can use the leading option with pdf.text (maybe you figured this out already):

sometext = "My big long string\ncovering multiple lines"  
pdf.text sometext, :size => 10, :leading => 5

Maybe you could use this with a bounding box like so:

 pdf.bounding_box([270,650], :width=>270, :height=>250) do
   pdf.text sometext, :size => 10, :leading => 5
 end