[wxruby-users] chart extension for wxRuby?

[Andreas Warberg]

Alex Fenton wrote:
> require 'scruffy'
> require 'wx'
> 
> class Chart < Wx::Window
>   attr_reader :graph
>   def initialize(*args)
>     super
>     evt_paint :on_paint
>     @graph = Scruffy::Graph.new(:title => "Monthly Profits")
>     graph.add(:line, 'John', [100, -20, 30, 60])
>     graph.add(:line, 'Sara', [120, 50, -80, 20])
>   end
> 
>   def on_paint
>     paint do | dc |
>       graph.render(dc, :width => size.width, :height => size.height)
>     end
>   end
> end
> 
> 
> Wx::App.run do
>   frame = Wx::Frame.new(nil, :title => 'chart demo')
>   chart = Chart.new(frame)
>   frame.show
> end

This won't run. I get 'in `render': wrong number of arguments (2 for 1) 
(ArgumentError)' when I copy your example verbatim.

Removing the extra argument in render and rerunning gives me:

C:/ruby/lib/ruby/gems/1.8/gems/scruffy-0.2.2/lib/scruffy/graph.rb:131:in 
`render': undefined method '[]' for #<Wx::PaintDC:0x591d318> 
(NoMethodError)

I would like to render a graph directly to the screen - is this possibly 
using scruffy / wxruby?

Regards
Andreas
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