center layout incorrect

[tbf]

using center layout in prawn is not correct as the length of lines is not correctly determined (incloding '\n' character)

This was published and discussed on in google group:
http://groups.google.com/group/prawn-ruby/browse_thread/thread/6754ada443dd22cd
workaround is to overwrite width_of method by manually removing tailing '\n' characters. (sorry the layout is broken as githup is always reformating this as coding)

module Prawn
class Document
alias_method :orig_width_of, :width_of
def width_of(string, options={})
orig_width_of(string.gsub(/\n\z/,""),options)
end
end
end

[practicingruby]

I don't think we can make an assumption about newlines.

The documentation in Prawn already states:

"Text wrap in Prawn does not re-flow linebreaks, so if you want fully automated text wrapping, be sure to remove newlines before attempting to draw your string. "

I could clarify that a little more, but this basically means it's up to you to remove your newlines. If font designers include a width for \n, it's best for us to respect those intentions even if they don't make much sense.

[fastpencil]

This particular issue is driving me crazy when using the Arial TTF font, which apparently has a width defined for the newline character, although I'm hard-pressed to figure out why anyone would want a newline to have width.