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Reference Guide
timeonaxis.C File Reference

Detailed Description

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This macro illustrates the use of the time mode on the axis with different time intervals and time formats.

Through all this script, the time is expressed in UTC. some information about this format (and others like GPS) may be found at http://tycho.usno.navy.mil/systime.html or http://www.topology.org/sci/time.html

The start time is : almost NOW (the time at which the script is executed) actually, the nearest preceding hour beginning. The time is in general expressed in UTC time with the C time() function This will obviously most of the time not be the time displayed on your watch since it is universal time. See the C time functions for converting this time into more useful structures.

#include <time.h>
TCanvas *timeonaxis()
{
time_t script_time;
script_time = time(0);
script_time = 3600*(int)(script_time/3600);
// The time offset is the one that will be used by all graphs.
// If one changes it, it will be changed even on the graphs already defined
gStyle->SetTimeOffset(script_time);
TCanvas *ct = new TCanvas("ct","Time on axis",10,10,700,900);
ct->Divide(1,3);
int i;
//### Build a signal : noisy damped sine
// Time interval : 30 minutes
gStyle->SetTitleH(0.08);
float noise;
TH1F *ht = new TH1F("ht","Love at first sight",3000,0.,2000.);
for (i=1;i<3000;i++) {
noise = gRandom->Gaus(0,120);
if (i>700) {
noise += 1000*sin((i-700)*6.28/30)*exp((double)(700-i)/300);
}
ht->SetBinContent(i,noise);
}
ct->cd(1);
ht->SetLineColor(2);
ht->GetXaxis()->SetLabelSize(0.05);
ht->Draw();
// Sets time on the X axis
// The time used is the one set as time offset added to the value
// of the axis. This is converted into day/month/year hour:min:sec and
// a reasonable tick interval value is chosen.
//### Build a simple graph beginning at a different time
// Time interval : 5 seconds
float x[100], t[100];
for (i=0;i<100;i++) {
x[i] = sin(i*4*3.1415926/50)*exp(-(double)i/20);
t[i] = 6000+(double)i/20;
}
TGraph *gt = new TGraph(100,t,x);
gt->SetTitle("Politics");
ct->cd(2);
gt->SetLineColor(5);
gt->SetLineWidth(2);
gt->Draw("AL");
gt->GetXaxis()->SetLabelSize(0.05);
// Sets time on the X axis
gPad->Modified();
//### Build a second simple graph for a very long time interval
// Time interval : a few years
float x2[10], t2[10];
for (i=0;i<10;i++) {
x2[i] = gRandom->Gaus(500,100)*i;
t2[i] = i*365*86400;
}
TGraph *gt2 = new TGraph(10,t2,x2);
gt2->SetTitle("Number of monkeys on the moon");
ct->cd(3);
gt2->SetMarkerColor(4);
gt2->SetMarkerStyle(29);
gt2->SetMarkerSize(1.3);
gt2->Draw("AP");
gt2->GetXaxis()->SetLabelSize(0.05);
// Sets time on the X axis
//
// One can choose a different time format than the one chosen by default
// The time format is the same as the one of the C strftime() function
// It's a string containing the following formats :
//
// for date :
// %a abbreviated weekday name
// %b abbreviated month name
// %d day of the month (01-31)
// %m month (01-12)
// %y year without century
// %Y year with century
//
// for time :
// %H hour (24-hour clock)
// %I hour (12-hour clock)
// %p local equivalent of AM or PM
// %M minute (00-59)
// %S seconds (00-61)
// %% %
// The other characters are output as is.
gt2->GetXaxis()->SetTimeFormat("y. %Y %F2000-01-01 00:00:00");
gPad->Modified();
return ct;
}
Option_t Option_t TPoint TPoint const char x2
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
#define gPad
Definition: TVirtualPad.h:288
virtual void SetLabelSize(Float_t size=0.04)
Set size of axis labels.
Definition: TAttAxis.cxx:206
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition: TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
virtual void SetMarkerColor(Color_t mcolor=1)
Set the marker color.
Definition: TAttMarker.h:38
virtual void SetMarkerStyle(Style_t mstyle=1)
Set the marker style.
Definition: TAttMarker.h:40
virtual void SetMarkerSize(Size_t msize=1)
Set the marker size.
Definition: TAttMarker.h:45
virtual void SetTimeDisplay(Int_t value)
Definition: TAxis.h:162
virtual void SetTimeFormat(const char *format="")
Change the format used for time plotting.
Definition: TAxis.cxx:1052
The Canvas class.
Definition: TCanvas.h:23
TVirtualPad * cd(Int_t subpadnumber=0) override
Set current canvas & pad.
Definition: TCanvas.cxx:711
A TGraph is an object made of two arrays X and Y with npoints each.
Definition: TGraph.h:41
void Draw(Option_t *chopt="") override
Draw this graph with its current attributes.
Definition: TGraph.cxx:808
TAxis * GetXaxis() const
Get x axis of the graph.
Definition: TGraph.cxx:1553
void SetTitle(const char *title="") override
Change (i.e.
Definition: TGraph.cxx:2338
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:577
TAxis * GetXaxis()
Definition: TH1.h:322
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content see convention for numbering bins in TH1::GetBin In case the bin number is greater th...
Definition: TH1.cxx:9089
void Divide(Int_t nx=1, Int_t ny=1, Float_t xmargin=0.01, Float_t ymargin=0.01, Int_t color=0) override
Automatic pad generation by division.
Definition: TPad.cxx:1153
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition: TRandom.cxx:274
void SetTimeOffset(Double_t toffset)
Change the time offset for time plotting.
Definition: TStyle.cxx:1806
void SetTitleH(Float_t h=0)
Definition: TStyle.h:400
RVec< PromoteType< T > > exp(const RVec< T > &v)
Definition: RVec.hxx:1783
RVec< PromoteType< T > > sin(const RVec< T > &v)
Definition: RVec.hxx:1797
Double_t x[n]
Definition: legend1.C:17
Author
Damir Buskulic

Definition in file timeonaxis.C.