fxruby users - Mar 2007 - drawing on canvas

And I have no idea how to get this canvas working.
I''ve been looking at the scribble.rb example and trying to work off
that.

I get a seg fault when I run the method.  @canvas is an instance of 
FXCanvas.

 def display
   FXDCWindow.new(@canvas) do |dc|
     @torus.grid.each_with_index do |row, y|
       row.each_with_index do |part, x|
         if part == :vapor
           dc.foreground = "blue"
           dc.drawPoint(x, y)
         elsif part == :vacuum
           dc.foreground = "black"
           dc.drawPoint(x, y)
         elsif part == :ice
           dc.foreground = "gray"
           dc.drawPoint(x, y)
         end
       end
     end
   end
 end


What am I missing here?

On 3/11/07, Raj Sahae <rajsahae at gmail.com> wrote:
> And I have no idea how to get this canvas working.
> I''ve been looking at the scribble.rb example and trying to work
off that.
>
> I get a seg fault when I run the method.  @canvas is an instance of
> FXCanvas.
<snip>

Raj, I don''t see anything obviously wrong with the code, but it may
depend on the context from which the method is called. For example: At
the time the method is called (and causes the segfault), has the
canvas pointed to by @canvas actually been created yet?