Logo ROOT  
Reference Guide
 
Loading...
Searching...
No Matches
gtime2.C File Reference

Detailed Description

View in nbviewer Open in SWAN Example of TGraphTime showing how the class could be used to visualize a set of particles with their time stamp in a MonteCarlo program.

#include "TRandom3.h"
#include "TMath.h"
#include "TMarker.h"
#include "TPaveLabel.h"
#include "TArrow.h"
#include "TGraphTime.h"
void gtime2(Int_t nsteps = 200, Int_t np=5000) {
if (np > 5000) np = 5000;
Int_t color[5000];
Double_t cosphi[5000], sinphi[5000], speed[5000];
Double_t xmin = 0, xmax = 10, ymin = -10, ymax = 10;
g->SetTitle("TGraphTime demo 2;X;Y");
Int_t i,s;
Double_t phi,fact = xmax/Double_t(nsteps);
for (i=0;i<np;i++) { //calculate some object parameters
speed[i] = r.Uniform(0.5,1);
phi = r.Gaus(0,TMath::Pi()/6.);
cosphi[i] = fact*speed[i]*TMath::Cos(phi);
sinphi[i] = fact*speed[i]*TMath::Sin(phi);
Double_t rc = r.Rndm();
color[i] = kRed;
if (rc > 0.3) color[i] = kBlue;
if (rc > 0.7) color[i] = kYellow;
}
for (s=0;s<nsteps;s++) { //fill the TGraphTime step by step
for (i=0;i<np;i++) {
Double_t xx = s*cosphi[i];
if (xx < xmin) continue;
Double_t yy = s*sinphi[i];
TMarker *m = new TMarker(xx,yy,25);
m->SetMarkerColor(color[i]);
m->SetMarkerSize(1.5 -s/(speed[i]*nsteps));
g->Add(m,s);
}
g->Add(new TPaveLabel(.70,.92,.98,.99,Form("shower at %5.3f nsec",3.*s/nsteps),"brNDC"),s);
}
g->Draw();
}
ROOT::R::TRInterface & r
Definition Object.C:4
#define g(i)
Definition RSha256.hxx:105
int Int_t
Definition RtypesCore.h:45
double Double_t
Definition RtypesCore.h:59
@ kRed
Definition Rtypes.h:66
@ kBlue
Definition Rtypes.h:66
@ kYellow
Definition Rtypes.h:66
float xmin
float ymin
float xmax
float ymax
char * Form(const char *fmt,...)
TGraphTime is used to draw a set of objects evolving with nsteps in time between tmin and tmax.
Definition TGraphTime.h:29
Manages Markers.
Definition TMarker.h:22
A Pave (see TPave) with a text centered in the Pave.
Definition TPaveLabel.h:20
Random number generator class based on M.
Definition TRandom3.h:27
Double_t Cos(Double_t)
Definition TMath.h:593
constexpr Double_t Pi()
Definition TMath.h:37
Double_t Sin(Double_t)
Definition TMath.h:589
auto * m
Definition textangle.C:8
Author
Rene Brun

Definition in file gtime2.C.