// $Id: Example6.C,v 1.1 2010/07/18 16:36:31 videbaek Exp $
//
// This simple example divides a canvas into 2 pad (nx*ny)
// illustrates how to detup the offsets, and draw text with a given size.
//
void Example6(int opt=1){
  gSystem->Load("../.libs/libGrUtils.so");
  gROOT->ProcessLine("using namespace GraphUtils");
  gROOT->LoadMacro("../BasePlot.C+");

  savePNG=1;
  TH1F* h1 = new TH1F("h1","spec1",40,0,4.0);
  int i(3);
  for(double x=0.25;x<4.0;x+=0.1){
    double f = TMath::Exp(-x*5.0)*1000;
    double df= TMath::Sqrt(f);
    f = gRandom->Gaus(f,df);
    h1->SetBinContent(i,f);
    h1->SetBinError(i,df);
    i++;
  }

  TGraphAsymmErrors* gr = new TGraphAsymmErrors(h1);
  for(int b=0;b< gr->GetN(); b++){
    double x,y;
    gr->GetPoint(b,x,y);
    gr->SetPointEYhigh(b,0.6*y);
    gr->SetPointEYlow(b,0.2*y);
  }
  //
  // create 4 histograms from a kind of fct
  //

  SetupPage(4.5*2.54, 6.0*2.54);
  SetupCanvas("TestPlot","Test Plot Example6");
  bottomMargin=0.06;
  leftMinorMargin=0.005;
  bottomMinorMargin=0.03;
  topMargin=0.06;
  rightMinorMargin=0.005;
  rightMargin=0.12;
  if(opt) {
    leftJustify=1;
    botJustify=1;
  }

  titleYOffset=1.3;
  titleXOffset=0.45;
  
  fLegendLineColor=1;

  int nx(2), ny(3);
  double fdy[] = {2,1,1};
  double fdx[] = {2,1};
  InitPads(nx,ny, fdx, fdy);
  SetMarkerStyle(21);
  SetMarkerColor(kRed);
  SetLineColor(kRed);

  useScaling = kTRUE;
  useIncrement=kTRUE;
  scaleFactor=0.1;

 



  Float_t  frameMax = 999.;
  Float_t nDec = 4;
  Float_t frameMin = frameMax*TMath::Power(10.,-nDec);

  xTitle = "p_{T} (GeV/c)";
  yTitle = "#frac{1}{2#pi p_{T}} #frac{d^{2}N}{dp_{T}dy} (GeV/c)^{-2}";
  xNDiv = 1003;
  yNDiv = 510;

  CreateFrame(0,0, 0.000, 2.9999, frameMin, frameMax, 0, 1);
  CreateFrame(1,0, 0.000, 2.9999, frameMin, frameMax, 0, 1);
  frameMin = frameMax*TMath::Power(10.,-nDec/2);
  CreateFrame(0,1, 0.000, 2.9999, frameMin, frameMax, 0, 1);
  CreateFrame(1,1, 0.000, 2.9999, frameMin, frameMax, 0, 1);
  frameMax=2;
  frameMin=0;
  CreateFrame(0,2, 0.000, 2.9999, frameMin, frameMax, 0, 0);
  CreateFrame(1,2, 0.000, 2.9999, frameMin, frameMax, 0, 0);


  GetPad(0,2)->SetTicks(2,1);
  GetPad(0,1)->SetTicks(1,0);
  GetPad(1,2)->SetTicks(2,2);
  GetPad(1,1)->SetTicks(1,1);

  AddHistogram(0, h1,"#pi h1","e");
  AddSystErr(0, gr, -1., 34, 2001);
 
  SetMarkerColor(kBlue);
  SetLineColor(kBlue);
  currentScale = 1;

  DrawPads();

  Float_t padx = GetPadX(1);
  Float_t pady = GetPadY(0);

  PlotText(GetPad(1,0), padx/2., pady-0.4,"Pad 1,0",0.3)->SetTextColor(kBlue);

  Float_t padx = GetPadX(1);
  Float_t pady = GetPadY(2);

  PlotText(GetPad(1,2), padx/2., pady-0.4,"Pad 1,2",0.3)->SetTextColor(kBlue);

  SaveFigure("example5");




}