#include <TH2.h>
#include <TCanvas.h>
#include <TRandom3.h>

void hcalign()
{
	gStyle->SetPalette(kBird);
	gStyle->SetOptStat(0);
	gStyle->SetLabelSize(0.025,"Z");
	Bool_t logz = kFALSE;
	
   TCanvas *c1 = new TCanvas("c1","TPaletteAxis, labels alignment ",300,10,700,700);
   c1->Divide(2,2);
   TH2F *hpxpy = new TH2F("hpxpy","py vs px",40,-4,4,40,-4,4);
   // Fill histograms randomly
   TRandom3 randomNum;
   Float_t px, py;
   for (Int_t i = 0; i < 25000; i++) {
      randomNum.Rannor(px,py);
      hpxpy->Fill(px,py);
	}
	hpxpy->SetContour(8);
	hpxpy->SetMaximum(200);
	c1->cd(1);
	gPad->SetLogz(logz);
	hpxpy->SetTitle("Default");
	hpxpy->DrawCopy("COL Z");
	c1->cd(2);
	gPad->SetLogz(logz);
	hpxpy->SetTitle("Option: CJUST");
	hpxpy->DrawCopy("COL Z CJUST");
	Double_t zcontours[5] = {0, 20, 40, 80, 120};
	hpxpy->SetContour(5, zcontours);
	c1->cd(3);
	gPad->SetLogz(logz);
	hpxpy->SetTitle("User contours, default");
	hpxpy->DrawCopy("COL Z");
	c1->cd(4);
	gPad->SetLogz(logz);
	hpxpy->SetTitle("User contours, CJUST");
	hpxpy->DrawCopy("COL Z CJUST");
	c1->SaveAs("calign.pdf");
}