doc/v618/spectrumpainter_8C.html

void spectrumpainter()

{

   TH2 *h2 = new TH2F("h2","h2",40,-8,8,40,-9,9);

   Float_t px, py;

   for (Int_t i = 0; i < 50000; i++) {

      gRandom->Rannor(px,py);

      h2->Fill(px,py);

      h2->Fill(px+4,py-4,0.5);

      h2->Fill(px+4,py+4,0.25);

      h2->Fill(px-3,py+4,0.125);

   }


   TCanvas *c1 = new TCanvas("c1","Illustration of 2D graphics",10,10,800,700);

   c1->Divide(2,2);


   c1->cd(1);

   h2->Draw("SPEC dm(2,10) zs(1)");

   c1->cd(2);

   h2->Draw("SPEC dm(1,10) pa(2,1,1) ci(1,4,8) a(15,45,0)");

   c1->cd(3);

   h2->Draw("SPEC dm(2,10) pa(1,1,1) ci(1,1,1) a(15,45,0) s(1,1)");

   c1->cd(4);

   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)");

}

Int_t
int Int_t
Definition: RtypesCore.h:41

Float_t
float Float_t
Definition: RtypesCore.h:53

gRandom
R__EXTERN TRandom * gRandom
Definition: TRandom.h:62

TCanvas
The Canvas class.
Definition: TCanvas.h:31

TH1::Draw
virtual void Draw(Option_t *option="")
Draw this histogram with options.
Definition: TH1.cxx:2981

TH2F
2-D histogram with a float per channel (see TH1 documentation)}
Definition: TH2.h:248

TH2
Service class for 2-Dim histogram classes.
Definition: TH2.h:30

TH2::Fill
Int_t Fill(Double_t)
Invalid Fill method.
Definition: TH2.cxx:292

TRandom::Rannor
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:489

c1
return c1
Definition: legend1.C:41