From: Joel VanderWerf <vjoel@...>
Date: 2009-09-09T05:29:47+09:00
Subject: Re: Zoomable TkCanvas?

Josef Wolf wrote:
> But how do I override the methods to create the items? In Perl/Tk, that
> would be easy, since item creation is done via canvas methods.  But in
> Ruby/Tk, items are created via their own classes (e.g. TkcLine.new(args)
> or something). There don't seem to exist methods in the Canvas class to
> create items, which could easily be overridden.

Maybe subclass (or delegate to) the Tk classes:

class MyRectangle < TkcRectangle
   def initialize(x,y,w,h)
     super(...) # adjust args depending on zoom level etc.
   end
end

-- 
       vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407