Rails - Mar 2007 - Gruff with PDF::Writer

Hello all

Has anyone managed to embed gruff graphs into a PDF document using
pdf::writer?

The easy way (as far as I can see) would be to just save the gruff graph
as a temporary file then read that file in pdf::writer. I was wondering
if anyone had managed to get them working together directly?

RJ

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I''m definitely looking for a solution to the same thing as well.

On Mar 27, 11:53 am, RJ
<rails-mailing-l...-ARtvInVfO7ksV2N9l4h3zg@public.gmane.org>
wrote:
> Hello all
>
> Has anyone managed to embed gruff graphs into a PDF document using
> pdf::writer?
>
> The easy way (as far as I can see) would be to just save the gruff graph
> as a temporary file then read that file in pdf::writer. I was wondering
> if anyone had managed to get them working together directly?
>
> RJ
>
> --
> Posted viahttp://www.ruby-forum.com/.

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Bump...me too.


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I did this pretty easily using the technique RJ described earlier  
with writing a temp file.  It''s kind of a hack but it works.

What I''m doing is:

First generating the gruff graphs and storing it as file, then  
loading that file in as a blob in the db
Then generate the pdf by pulling the graphs out of the db, store them  
as temp files, then load that  file using the pdf image method.

Andy

On Apr 11, 2007, at 3:28 PM, infoarts-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org
wrote:
>
> Bump...me too.
>
>
> 
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There is a much easier workaround.
You may just set opacity to zero. Here''s how I did it:

require "gruff"
class Chart < Gruff::StackedBar
  def opacity
    @base_image.opacity
  end
  def opacity=( value )
    @base_image.opacity = value
  end

  def draw
    super
    self.opacity = 0
  end
end

Or, you may re-open the image and save it again:
  g = Gruff::StackedBar.new( 640 )
  # ...
  i = unique_filename
  g.write( i )

  image = Magick::Image.read( i ).first
  image.opacity = 0
  image.write( i )

  pdf = PDF::Writer.new
  ( pdf.image i ) && File.delete( i )
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