使用大虾生成pdf时出错

Question

I am trying to use tags to give some styling for a pdf being generated using prawn. But, there seems to be an error.

require 'rubygems' 
require 'prawn'
require 'prawn/layout'
require 'prawn/format'

Prawn::Document.generate "example.pdf" do 
        tags:h1=>{ :font_size => "16pt", :font_weight => :bold }
        text"<h1>Student Details</h1>" 
end 

I get the following error -

 /usr/lib/ruby/gems/1.8/gems/prawn-format-0.2.3/lib/prawn/format/text_object.rb:91:in `%': can't convert nil into Float (TypeError)

Any help is greatly appreciated.

Cheers!!

Answer 1

Shouldn't it be:

tags[:h1] = { :font_size => "16pt", :font_weight => :bold }

?

Also please note that:

As of Prawn 0.7, prawn-format is completely unsupported, and will not work with versions of Prawn 0.7+. Feel free to fork and fix, of course.

Consider using methods from Prawn::Text

http://rubydoc.info/gems/prawn/0.12.0/Prawn/Text

EDIT

For example:

require 'rubygems'
require 'prawn'

Prawn::Document.generate('font_calculations.pdf') do
  font "Courier", :size => 16, :style => :bold
  text "Student details"
  font "Courier", :size => 12, :style => :normal
  text "normal text"
  text "this is normal, <b>but this is bold</b>", :inline_format => true
  text "normal <font size='18'>bigger</font> normal", :inline_format => true
end

That's just one of many ways of doing this.