doc/v606/spectrumpainter_8C.html

{

   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)");

}