doc/v624/multicolor_8C.html

#include "TCanvas.h"

#include "TH2.h"

#include "THStack.h"

#include "TRandom.h"


void multicolor(Int_t isStack=0) {

   TCanvas *c1 = new TCanvas;

   Int_t nbins = 20;

   TH2F *h1 = new TH2F("h1","h1",nbins,-4,4,nbins,-4,4);

   h1->SetFillColor(kBlue);

   TH2F *h2 = new TH2F("h2","h2",nbins,-4,4,nbins,-4,4);

   h2->SetFillColor(kRed);

   TH2F *h3 = new TH2F("h3","h3",nbins,-4,4,nbins,-4,4);

   h3->SetFillColor(kYellow);

   THStack *hs = new THStack("hs","three plots");

   hs->Add(h1);

   hs->Add(h2);

   hs->Add(h3);

   TRandom r;

   Int_t i;

   for (i=0;i<20000;i++) h1->Fill(r.Gaus(),r.Gaus());

   for (i=0;i<200;i++) {

      Int_t ix = (Int_t)r.Uniform(0,nbins);

      Int_t iy = (Int_t)r.Uniform(0,nbins);

      Int_t bin = h1->GetBin(ix,iy);

      Double_t val = h1->GetBinContent(bin);

      if (val <= 0) continue;

      if (!isStack) h1->SetBinContent(bin,0);

      if (r.Rndm() > 0.5) {

         if (!isStack) h2->SetBinContent(bin,0);

         h3->SetBinContent(bin,val);

      } else {

         if (!isStack) h3->SetBinContent(bin,0);

         h2->SetBinContent(bin,val);

      }

   }

   hs->Draw("lego1");

}


r
ROOT::R::TRInterface & r
Definition Object.C:4

Int_t
int Int_t
Definition RtypesCore.h:45

Double_t
double Double_t
Definition RtypesCore.h:59

kRed
@ kRed
Definition Rtypes.h:66

kBlue
@ kBlue
Definition Rtypes.h:66

kYellow
@ kYellow
Definition Rtypes.h:66

TCanvas.h

TH2.h

THStack.h

TRandom.h

TAttFill::SetFillColor
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37

TCanvas
The Canvas class.
Definition TCanvas.h:23

TH1::GetBin
virtual Int_t GetBin(Int_t binx, Int_t biny=0, Int_t binz=0) const
Return Global bin number corresponding to binx,y,z.
Definition TH1.cxx:4893

TH1::Fill
virtual Int_t Fill(Double_t x)
Increment bin with abscissa X by 1.
Definition TH1.cxx:3350

TH1::SetBinContent
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content see convention for numbering bins in TH1::GetBin In case the bin number is greater th...
Definition TH1.cxx:9062

TH1::GetBinContent
virtual Double_t GetBinContent(Int_t bin) const
Return content of bin number bin.
Definition TH1.cxx:4993

TH2F
2-D histogram with a float per channel (see TH1 documentation)}
Definition TH2.h:251

TH2::SetBinContent
virtual void SetBinContent(Int_t bin, Double_t content)
Set bin content.
Definition TH2.cxx:2507

THStack
The Histogram stack class.
Definition THStack.h:38

THStack::Draw
virtual void Draw(Option_t *chopt="")
Draw this multihist with its current attributes.
Definition THStack.cxx:467

THStack::Add
virtual void Add(TH1 *h, Option_t *option="")
add a new histogram to the list Only 1-d and 2-d histograms currently supported.
Definition THStack.cxx:381

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

c1
return c1
Definition legend1.C:41

h1
TH1F * h1
Definition legend1.C:5