Hi Ed,
there is a new image class TASImage since 3.03.08. (See Version 3.03/08
Release Notes) This was developed for better performance in screen update. You
need a low level library, which you can download from the ROOT page:
ftp://root.cern.ch/root/libAfterImage.tar.gz
But, I never tested it on Windows! I don't know if this works at all on
Windows, but it could help you with your timing problems.
Reiner.
On 30-Aug-02 at 23:51, Ed Oltman (eoltman@imago.com) wrote:
> Hello,
> I have an online application which includes a 500x500 bin TH2F which I
> display in response to a timer with
>
> p2DH->Draw("colz");
> gPad->GetCanvas()->Update();
>
> (I've previously called gStyle->SetPalette(1,0)) Early on, when the
> histogram is still young, the refresh is pretty quick - refreshing at 2 Hz
> uses a small amount (<10%) of the cpu time. Gradually, as the histogram
> fills, the refresh time increases - by the time the histogram has a few
> hundred thousand entries, (maximum bin contents is in the 10s) the cpu time
> is 80% and climing.
>
> Is there something I could do to speed things up, short of adjusting the
> refresh rate? I am using version 3.03/08 on Win32. Thanks...
>
> Ed Oltman
>
>
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