doc/master/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:45

Float_t
float Float_t
Definition RtypesCore.h:57

gRandom
R__EXTERN TRandom * gRandom
Definition TRandom.h:62

TCanvas
The Canvas class.
Definition TCanvas.h:23

TH2F
2-D histogram with a float per channel (see TH1 documentation)
Definition TH2.h:308

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

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:507

c1
return c1
Definition legend1.C:41