[wxruby-users] how can I use draw line in wxruby??

[Bass Guitar]

I use

dc = DC.new()
dc.draw_line(50,  50,  100, 100)

but it can't be compiled
I don't know how to declare DC variable??
in http://wxruby.rubyforge.org/doc/dc.html
it don't tell me how to declare now variable
plese tell me :'(
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