undefined method `create_cairo_context'

[zzak]

Environment: ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux]

atk (0.20.1)
cairo (1.10.0)
gdkpixbuf (0.20.1)
glib2 (0.20.0)
gtk2 (0.20.1)
pango (0.20.1)
pkg-config (1.0.3)
rake (0.8.7)

Linux Project1201n 2.6.32-24-generic 41-Ubuntu SMP Thu Aug 19 01:12:52 UTC 2010 i686      GNU/Linux

libcairo2-dev

Steps to reproduce: ruby shoes.rb doesn't return anything.

but

$ irb
require '/path/to/shoes.rb'
# otherwise get require error
Shoes.app width: 300, height: 300 do
  para 'Hello world!'
end

Stack trace:

/home/zak/code/green_shoes/shoes/app.rb:57:in `block in para': undefined method `create_cairo_context' for #<Gdk::Window:0x8b11ef0 ptr=0x8acb540>
from /home/zak/code/green_shoes/shoes/app.rb:39:in `call'
from /home/zak/code/green_shoes/shoes/app.rb:39:in `main'
from /home/zak/code/green_shoes/shoes/app.rb:39:in `app'
from (irb):4:in `irb_binding'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/workspace.rb:80:in `eval'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/workspace.rb:80:in `evaluate'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/context.rb:254:in `evaluate'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:159:in `block (2 levels) in eval_input'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:273:in `signal_status'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:156:in `block in eval_input'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/ruby-lex.rb:243:in `block (2 levels) in each_top_level_statement'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `loop'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/ruby-lex.rb:229:in `block in each_top_level_statement'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `catch'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb/ruby-lex.rb:228:in `each_top_level_statement'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:155:in `eval_input'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:70:in `block in start'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:69:in `catch'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/lib/ruby/1.9.1/irb.rb:69:in `start'
from /home/zak/.rvm/rubies/ruby-1.9.2-p0/bin/irb:17:in `<main>'

[ashbb]

Thank you for the information. I could reproduce this issue (I got the same error). I guess this issue is due to ruby 1.9.2p0. Because Green Shoes is working well with ruby-1.9.1-p378 on Linux (VirtualBox for Windows) now.

Although on my Windows 7, Green Shoes works with ruby 1.9.2p0...

[ashbb]

Incorrect.
Not due to ruby 1.9.2p0, but rcairo 1.10.0.
I'm not sure this is a bug of rcairo or spec change, though.

Try the following at this time:

gem uninstall cairo
gem uninstall pango
gem uninstall gtk2
gem install cairo '=1.8.1'
gem install pango
gem install gtk2

Green Shoes will work well on Linux.

[zzak]

Sweet, I can get it to work now, but I have to adjust the require's a little.

# samples/sample1.rb
# require '../shoes'
require_relative '../shoes'

And the image is being included irregularly too (it doesn't show up from '../static/gshoes-icon.png'), is this because of the path change in 1.9.2?

[steveklabnik]

I still get this error even when I install cairo 1.8.1, on OSX. :/

[steveklabnik]

FWIW, I set up a Gemfile and used Bundler. Here's my Gemfile.lock.... http://gist.github.com/608281

Do any of those versions look wrong?

[steveklabnik]

ash, can you post what verisons of everything you're using?

[ashbb]

Windows 7:

I've compiled Ruby/GTK2 and rcairo by myself. Look at a note.

So, the following is not helpful, though.

C:\>ruby -v
ruby 1.9.2p0 (2010-08-18) [i386-mingw32]

C:\>gem list

*** LOCAL GEMS ***

gemcutter (0.6.1)
git (1.2.5)
jeweler (1.4.0)
json_pure (1.4.6)
minitest (1.6.0)
nokogiri (1.4.3.1 x86-mingw32)
rake (0.8.7)
rdoc (2.5.8)
rubyforge (2.0.4)

Ubuntu on Virtual Box for Windows 7:

Just only did sudo gem install cairo and pango and gtk2. Look at a note.

ashbb:~$ ruby -v
ruby 1.9.2p0 (2010-08-18 revision 29036) [i686-linux]
ashbb:~$ gem list

*** LOCAL GEMS ***

atk (0.20.1)
cairo (1.8.1)
gdkpixbuf (0.20.1)
glib2 (0.20.0)
green_shoes (0.0.1)
gtk2 (0.20.1)
minitest (1.6.0)
pango (0.20.1)
pkg-config (1.0.3)
rake (0.8.7)
rdoc (2.5.8)

[zzak]

This seems to be fixed with the latest version of the ruby-gtk2 bindings, 0.90.5.

[ashbb]

Wow, good news!