Hi,
May be this can help you.I took it from guitest.C
pro()
{
TH2D *h1 = new TH2D("h1","h1", 100, -4, 4, 100, -4, 4 );
TH1D *p1 = h1->ProjectionX("pro_h1", 40, 50,"" );
TCanvas *c1 = new TCanvas("c1", "c1", 10, 20, 620, 300);
TCanvas *c2 = new TCanvas("c2", "c2", 710, 20, 620, 300);
c1->cd();
h1->Draw();
c2->cd();
p1->Draw();
const int kUPDATE = 100000;
int cnt = 0;
while( 1 )
{
float px, py;
gRandom->Rannor(px,py);
h1->Fill(px,py);
p1->Fill(px);
cnt++;
if (!(cnt % kUPDATE)) {
c1->cd();
c1->Modified();
c1->Update();
c2->cd();
c2->Modified();
c2->Update();
}
gSystem->ProcessEvents(); // handle GUI events
}
}
cheers
Ernesto.
On Fri, 9 May 2003, Thomas Bretz wrote:
> Hi all,
>
> I have some kind of online display in which I can display histograms
> (TH?D drawn in a TRootEmbeddedCanvas). When our calculation is filling
> the histogram I update the histogram continously (let's say each 5sec)
> by calling pad->Modified() pad->Update() for the corresponding pad. This
> works fine for the histograms we fill ourself, but how can I provide
> online update of Projections of 2D histograms? I don't want to rebuild
> the object every time. In principal it would be enough if I could update
> the contants of a projection from the contants of its 'parent'
> histogram. Any idea how I can do this (without Copy&Paste the code from
> TH2::Project to my code)?
>
> Thanks in advance,
> Thomas.
>
>
>
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