in reply to Re^2: Which tk to use and how to show images?
in thread Which tk to use and how to show images?

Yeah, you have it pretty close, by undef'ing $gd. I ran your code with a repeat and it leveled out after about 200 updates, only gaining about 200k, which is probably due to the total area of bar space displayed maxing out eventually. But I still think the plain canvas approach uses less cpu.
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Re^4: Which tk to use and how to show images?
by BrowserUk (Patriarch) on Nov 04, 2005 at 17:44 UTC
    But I still think the plain canvas approach uses less cpu

    Oh, I totally agree. If the graph is only ever to be displayed in Tk, and not re-used as an image elsewhere, a Canvas does make sense.

    That said, GD::Graph does do some stuff with scaling and ticks, labels and pie-charts that are not trivial to reproduce.

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[reply]

      Plus if you wanted to make the graphs interactive (make elements in the graph responsive to Mouse events) within Tk, then it would be easier with Canvas implementation -- or Tk::Graph for that matter. I'd like to see that module adapted for Tk::Zinc. It would gain some nice additional capabilities over Canvas.

[reply]

        It would be nice if there was a Canvas method for dumping the image it renders, into the various graphic formats. I realise that you can query the pels and could format them up yourself, or import thme back into a GD object for outputting as an image, but that would be very slow.

        Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
        Lingua non convalesco, consenesco et abolesco. -- Rule 1 has a caveat! -- Who broke the cabal?
        "Science is about questioning the status quo. Questioning authority".
        In the absence of evidence, opinion is indistinguishable from prejudice.
[reply]

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