RE: Sliding graph

From: Emanuel Machado <Emanuel-Machado_at_cytonome.com>
Date: Sun, 16 Dec 2007 22:22:04 -0500

Hi, Rene,

Looks like a good possibility, thanks! I couldn't initialize TGraph with 0 elements, but it worked well with 1 (and changing Int_n to int).

Again, thanks a lot.

(Shouldn't CERN be closed for Christmas by now?)

Emanuel

---

Emanuel Machado, PhD.
Senior Engineer, Project Leader    

Cytonome, Inc.
27 Drydock Ave
Boston, MA 02210
Voice: (617) 330-5030 ext. 237
Fax: (617) 330-5031
Website: www.cytonome.com  

Email: Emanuel-Machado_at_cytonome.com  

> -----Original Message-----
> From: Rene Brun [mailto:Rene.Brun_at_cern.ch]
> Sent: Saturday, December 15, 2007 3:28 AM
> To: Emanuel Machado
> Cc: 'roottalk'
> Subject: Re: [ROOT] Sliding graph
>
> Emanuel,
>
> You can try something teh example below.
>
> Rene
>
> {
> Int_t n=0,N=0, ndrop = 100, nmax = 1000;
> TGraph *g = new TGraph(0);
> TCanvas c1;
> c1.SetGrid();
> g->Draw("alp");
> TRandom r;
> while(1) {
> if (n ==nmax-1) {
> TGraph *gtemp = new
> TGraph(nmax-ndrop,g->GetX()+ndrop,g->GetY()+ndrop);
> delete g;
> g=gtemp;
> n -=ndrop;
> g->Draw("alp");
> }
> g->SetPoint(n,N,0.5*r.Rndm()+5*TMath::Sin(N/200.)+5.5);
> n++;N++;
> if (n%5 == 0) {
> g->SetMarkerStyle(21);
> g->SetMarkerSize(.1);
> g->SetMinimum(0);
> g->SetMaximum(12);
> c1->Modified();
> c1->Update();
> gSystem->ProcessEvents();
> }
> }
> }
>
> Emanuel Machado wrote:
> > Hi,
> >
> > We're trying to use a graph-like display that accumulates data all the
> time
> > but after a certain number of points it starts to dump the old ones.
> > Something like
> >
> > TGraph *p = new TGraph(n, x, y)
> > x = ...
> > y = ...
> > p->Draw()
> >
> > Int i = 0;
> > While (1) {
> > // my hardware acquisition
> > AcquirePoint (i &yp)
> >
> > // place point in graph
> > if (i <n) {
> > p->SetPoint(i,yp);
> > } else {
> > // remove first point
> > p->RemovePoint(0);
> > // insert point at the end
> > p->InsertPoint(n-1,yp);
> > }
> > P->Modified();
> > p->Update();
> > }
> >
> > Unfortunately, of course, this does not work since InsertPoint is meant
> for
> > mouse access. Is there a way (perhaps more obvious) to achieve this
> effect?
> >
> > Many thanks,
> >
> > Emanuel
> >
> > ----
> > Emanuel Machado, PhD.
> > Senior Engineer, Project Leader
> >
> >
> >
> > Cytonome, Inc.
> > 27 Drydock Ave
> > Boston, MA 02210
> > Voice: (617) 330-5030 ext. 237
> > Fax: (617) 330-5031
> > Website: www.cytonome.com
> >
> > Email: Emanuel-Machado_at_cytonome.com
> >
> >
> >> -----Original Message-----
> >> From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch]
> On
> >> Behalf Of Rene Brun
> >> Sent: Friday, December 14, 2007 4:47 AM
> >> To: roottalk; project-lcg-peb-apps_at_cern.ch; project-lcg-af_at_cern.ch
> >> Subject: [ROOT] Pre-Production release 5.17/08 is now available
> >>
> >> The pre-production release of ROOT 5.17/08 is now available.
> >> This will be the last development version for 5.17. We release it
> before
> >> Christmas to give a
> >> chance to the major collaborations to test their frameworks in the
> >> coming few weeks. Our plan is to make a production release 5.18 on
> >> January 16.
> >> Between now and the production release in January, no new developments
> >> will be introduced, only possible bug fixes. We encourage the maximum
> >> number of people to test this version 5.17/08 and report potential
> >> problems to us as soon as possible . In case you are upgrading from
> >> version 5.14, please read the releases notes of version 5.16 in
> addition
> >> to the release notes of this new version.
> >> For more details, see http://root.cern.ch
> >>
> >> Rene Brun, on behalf of the ROOT team
> >>
> >
> >
> >
Received on Mon Dec 17 2007 - 04:20:03 CET