doc/v618/th2polyBoxes_8C.html

TCanvas *th2polyBoxes() {

   TCanvas *ch2p2 = new TCanvas("ch2p2","ch2p2",600,400);

   gStyle->SetPalette(57);

   TH2Poly *h2p = new TH2Poly();

   h2p->SetName("Boxes");

   h2p->SetTitle("Boxes");


   Int_t i,j;

   Int_t nx = 40;

   Int_t ny = 40;

   Double_t xval1,yval1,xval2,yval2;

   Double_t dx=0.2, dy=0.1;

   xval1 = 0.;

   xval2 = dx;


   for (i = 0; i<nx; i++) {

      yval1 = 0.;

      yval2 = dy;

      for (j = 0; j<ny; j++) {

         h2p->AddBin(xval1, yval1, xval2, yval2);

         yval1 = yval2;

         yval2 = yval2+yval2*dy;

      }

      xval1 = xval2;

      xval2 = xval2+xval2*dx;

   }


   TRandom ran;

   for (i = 0; i<300000; i++) {

      h2p->Fill(50*ran.Gaus(2.,1), ran.Gaus(2.,1));

   }


   h2p->Draw("COLZ");

   return ch2p2;

}

Int_t
int Int_t
Definition: RtypesCore.h:41

Double_t
double Double_t
Definition: RtypesCore.h:55

gStyle
R__EXTERN TStyle * gStyle
Definition: TStyle.h:406

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

TH1::SetTitle
virtual void SetTitle(const char *title)
See GetStatOverflows for more information.
Definition: TH1.cxx:6309

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

TH1::SetName
virtual void SetName(const char *name)
Change the name of this histogram.
Definition: TH1.cxx:8374

TH2Poly
2D Histogram with Polygonal Bins
Definition: TH2Poly.h:66

TH2Poly::Fill
virtual Int_t Fill(Double_t x, Double_t y)
Increment the bin containing (x,y) by 1.
Definition: TH2Poly.cxx:616

TH2Poly::AddBin
virtual Int_t AddBin(TObject *poly)
Adds a new bin to the histogram.
Definition: TH2Poly.cxx:222

TRandom
This is the base class for the ROOT Random number generators.
Definition: TRandom.h:27

TRandom::Gaus
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:263

TStyle::SetPalette
void SetPalette(Int_t ncolors=kBird, Int_t *colors=0, Float_t alpha=1.)
See TColor::SetPalette.
Definition: TStyle.cxx:1637