From: Paul Duncan <pabs@...>
Date: 2002-12-25T07:17:04+09:00
Subject: Re: creating on the fly jpgs/pngs etc


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* Brad Cox (bcox@virtualschool.edu) wrote:
> At 01:37 AM +0900 12/25/02, me wrote:
> >I want to create jpgs on the fly but I dont see any module for this. The=
re
> >is a ruby/GD module but it has to be build from ruby source which Im
> >disinclined to do. Are there any other solutions anyone knows of?
>=20
> Very lightweight jpgs or heavy-weight flies? ;)

Imlib2-Ruby can create jpgs on the fly.

pabs@vault:~/proj/jpg> cat ./jpg.rb=20
#!/usr/bin/ruby=20
require 'imlib2'

im =3D Imlib2::Image.new 640, 480
im.fill_rect 0, 0, 640, 480, Imlib2::Color::RED

begin
  im.save 'output.jpg'
rescue
  $stderr.puts "Couldn't save output.jpg: #$!"
end

pabs@vault:~/proj/jpg> ./jpg.rb
pabs@vault:~/proj/jpg> file ./output.jpg=20
=2E/output.jpg: JPEG image data, JFIF standard 1.01, aspect ratio, 1 x 1
pabs@vault:~/proj/jpg>=20

Caveats: Only works under Unix variants (Linux, FreeBSD, etc), and
Imlib2 itself is not really being actively developed any more (although
there are bugfixes etc).  Anyway, Imlib2-Ruby is available at
http://www.pablotron.org/software/imlib2-ruby/ if you want to check it
out (and there are packages available for Debian, as well as a FreeBSD
port).  I'm looking at wrapping another popular image processing
library, but I haven't started on that yet.

> Seriously, I know of nothing like this for ruby but haven't looked=20
> hard either. Java has this but it was a real bear to use last time I=20
> looked.
> --=20
>=20
> Brad Cox, PhD; bcox@virtualschool.edu 703 361 4751 http://virtualschool.e=
du
> o For industrial age goods there were checks and credit cards.
>    For everything else there is http://virtualschool.edu/mybank
> o Java Web Application Architecture: http://virtualschool.edu/jwaa
> o Ruby Interactive Learning Environment http://virtualschool.edu/ile
> o Support Israel and Palestine: http://virtualschool.edu/mideast

--=20
Paul Duncan <pabs@pablotron.org>        pabs in #gah (OPN IRC)
http://www.pablotron.org/               OpenPGP Key ID: 0x82C29562

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