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Reference Guide
spectrumpainter.C
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1/// \file
2/// \ingroup tutorial_spectrum
3/// \notebook
4/// Examples showing how to use TSpectrum2Painter (the SPEC option)
5///
6/// \macro_image
7/// \macro_code
8///
9/// \author: Olivier Couet, Miroslav Morhac
10
11void spectrumpainter()
12{
13 TH2 *h2 = new TH2F("h2","h2",40,-8,8,40,-9,9);
14 Float_t px, py;
15 for (Int_t i = 0; i < 50000; i++) {
16 gRandom->Rannor(px,py);
17 h2->Fill(px,py);
18 h2->Fill(px+4,py-4,0.5);
19 h2->Fill(px+4,py+4,0.25);
20 h2->Fill(px-3,py+4,0.125);
21 }
22
23 TCanvas *c1 = new TCanvas("c1","Illustration of 2D graphics",10,10,800,700);
24 c1->Divide(2,2);
25
26 c1->cd(1);
27 h2->Draw("SPEC dm(2,10) zs(1)");
28 c1->cd(2);
29 h2->Draw("SPEC dm(1,10) pa(2,1,1) ci(1,4,8) a(15,45,0)");
30 c1->cd(3);
31 h2->Draw("SPEC dm(2,10) pa(1,1,1) ci(1,1,1) a(15,45,0) s(1,1)");
32 c1->cd(4);
33 h2->Draw("SPEC dm(1,10) pa(2,1,1) ci(1,4,8) a(15,45,0) cm(1,15,4,4,1) cg(1,2)");
34}
int Int_t
Definition: RtypesCore.h:45
float Float_t
Definition: RtypesCore.h:57
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62
The Canvas class.
Definition: TCanvas.h:23
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3060
2-D histogram with a float per channel (see TH1 documentation)}
Definition: TH2.h:257
Service class for 2-D histogram classes.
Definition: TH2.h:30
Int_t Fill(Double_t) override
Invalid Fill method.
Definition: TH2.cxx:347
virtual void Rannor(Float_t &a, Float_t &b)
Return 2 numbers distributed following a gaussian with mean=0 and sigma=1.
Definition: TRandom.cxx:500
return c1
Definition: legend1.C:41