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rf106_plotdecoration.C
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1 /// \file
2 /// \ingroup tutorial_roofit
3 /// \notebook -js
4 /// Basic functionality: adding boxes with parameters, statistics to RooPlots, decorating with arrows, text etc...
5 ///
6 /// \macro_image
7 /// \macro_output
8 /// \macro_code
9 ///
10 /// \date July 2008
11 /// \author Wouter Verkerke
12 
13 #include "RooRealVar.h"
14 #include "RooDataSet.h"
15 #include "RooGaussian.h"
16 #include "TCanvas.h"
17 #include "TAxis.h"
18 #include "RooPlot.h"
19 #include "TText.h"
20 #include "TArrow.h"
21 #include "TFile.h"
22 using namespace RooFit;
23 
25 {
26  // S e t u p m o d e l
27  // ---------------------
28 
29  // Create observables
30  RooRealVar x("x", "x", -10, 10);
31 
32  // Create Gaussian
33  RooRealVar sigma("sigma", "sigma", 1, 0.1, 10);
34  RooRealVar mean("mean", "mean", -3, -10, 10);
35  RooGaussian gauss("gauss", "gauss", x, mean, sigma);
36 
37  // Generate a sample of 1000 events with sigma=3
38  RooDataSet *data = gauss.generate(x, 1000);
39 
40  // Fit pdf to data
41  gauss.fitTo(*data);
42 
43  // P l o t p . d . f a n d d a t a
44  // -------------------------------------
45 
46  // Overlay projection of gauss on data
47  RooPlot *frame = x.frame(Name("xframe"), Title("RooPlot with decorations"), Bins(40));
48  data->plotOn(frame);
49  gauss.plotOn(frame);
50 
51  // A d d b o x w i t h p d f p a r a m e t e r s
52  // -----------------------------------------------------
53 
54  // Left edge of box starts at 55% of Xaxis)
55  gauss.paramOn(frame, Layout(0.55));
56 
57  // A d d b o x w i t h d a t a s t a t i s t i c s
58  // -------------------------------------------------------
59 
60  // X size of box is from 55% to 99% of Xaxis range, top of box is at 80% of Yaxis range)
61  data->statOn(frame, Layout(0.55, 0.99, 0.8));
62 
63  // A d d t e x t a n d a r r o w
64  // -----------------------------------
65 
66  // Add text to frame
67  TText *txt = new TText(2, 100, "Signal");
68  txt->SetTextSize(0.04);
69  txt->SetTextColor(kRed);
70  frame->addObject(txt);
71 
72  // Add arrow to frame
73  TArrow *arrow = new TArrow(2, 100, -1, 50, 0.01, "|>");
74  arrow->SetLineColor(kRed);
75  arrow->SetFillColor(kRed);
76  arrow->SetLineWidth(3);
77  frame->addObject(arrow);
78 
79  // P e r s i s t f r a m e w i t h a l l d e c o r a t i o n s i n R O O T f i l e
80  // ---------------------------------------------------------------------------------------------
81 
82  TFile f("rf106_plotdecoration.root", "RECREATE");
83  frame->Write();
84  f.Close();
85 
86  // To read back and plot frame with all decorations in clean root session do
87  // root> TFile f("rf106_plotdecoration.root") ;
88  // root> xframe->Draw() ;
89 
90  new TCanvas("rf106_plotdecoration", "rf106_plotdecoration", 600, 600);
91  gPad->SetLeftMargin(0.15);
92  frame->GetYaxis()->SetTitleOffset(1.6);
93  frame->Draw();
94 }
TArrow.h
RooPlot::Draw
virtual void Draw(Option_t *options=0)
Draw this plot and all of the elements it contains.
Definition: RooPlot.cxx:691
f
#define f(i)
Definition: RSha256.hxx:104
RooFit::Bins
RooCmdArg Bins(Int_t nbin)
Definition: RooGlobalFunc.cxx:177
TAttText::SetTextColor
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition: TAttText.h:43
RooGaussian.h
TAttText::SetTextSize
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition: TAttText.h:46
x
Double_t x[n]
Definition: legend1.C:17
RooGaussian
Plain Gaussian p.d.f.
Definition: RooGaussian.h:24
TCanvas.h
RooDataSet.h
TFile.h
RooPlot::addObject
void addObject(TObject *obj, Option_t *drawOptions="", Bool_t invisible=kFALSE)
Add a generic object to this plot.
Definition: RooPlot.cxx:422
rf106_plotdecoration
Definition: rf106_plotdecoration.py:1
RooFit::Layout
RooCmdArg Layout(Double_t xmin, Double_t xmax=0.99, Double_t ymin=0.95)
Definition: RooGlobalFunc.cxx:223
TGeant4Unit::gauss
static constexpr double gauss
Definition: TGeant4SystemOfUnits.h:263
RooFit
The namespace RooFit contains mostly switches that change the behaviour of functions of PDFs (or othe...
Definition: RooCFunction1Binding.h:29
RooAbsData::plotOn
virtual RooPlot * plotOn(RooPlot *frame, const RooCmdArg &arg1=RooCmdArg::none(), const RooCmdArg &arg2=RooCmdArg::none(), const RooCmdArg &arg3=RooCmdArg::none(), const RooCmdArg &arg4=RooCmdArg::none(), const RooCmdArg &arg5=RooCmdArg::none(), const RooCmdArg &arg6=RooCmdArg::none(), const RooCmdArg &arg7=RooCmdArg::none(), const RooCmdArg &arg8=RooCmdArg::none()) const
Definition: RooAbsData.cxx:547
RooFit::Name
RooCmdArg Name(const char *name)
Definition: RooGlobalFunc.cxx:63
RooPlot.h
RooPlot::GetYaxis
TAxis * GetYaxis() const
Definition: RooPlot.cxx:1258
RooPlot
A RooPlot is a plot frame and a container for graphics objects within that frame.
Definition: RooPlot.h:44
RooRealVar.h
kRed
@ kRed
Definition: Rtypes.h:66
TFile
A ROOT file is a suite of consecutive data records (TKey instances) with a well defined format.
Definition: TFile.h:54
sigma
const Double_t sigma
Definition: h1analysisProxy.h:11
TText
Base class for several text objects.
Definition: TText.h:22
TCanvas
The Canvas class.
Definition: TCanvas.h:23
arrow
Definition: RArrowDS.hxx:9
TObject::Write
virtual Int_t Write(const char *name=0, Int_t option=0, Int_t bufsize=0)
Write this object to the current directory.
Definition: TObject.cxx:795
TAxis.h
TArrow
Draw all kinds of Arrows.
Definition: TArrow.h:29
gPad
#define gPad
Definition: TVirtualPad.h:287
RooDataSet
RooDataSet is a container class to hold unbinned data.
Definition: RooDataSet.h:33
TAttAxis::SetTitleOffset
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition: TAttAxis.cxx:293
RooRealVar
RooRealVar represents a variable that can be changed from the outside.
Definition: RooRealVar.h:37
RooAbsData::statOn
virtual RooPlot * statOn(RooPlot *frame, const RooCmdArg &arg1=RooCmdArg::none(), const RooCmdArg &arg2=RooCmdArg::none(), const RooCmdArg &arg3=RooCmdArg::none(), const RooCmdArg &arg4=RooCmdArg::none(), const RooCmdArg &arg5=RooCmdArg::none(), const RooCmdArg &arg6=RooCmdArg::none(), const RooCmdArg &arg7=RooCmdArg::none(), const RooCmdArg &arg8=RooCmdArg::none())
Add a box with statistics information to the specified frame.
Definition: RooAbsData.cxx:1165
TText.h
RooFit::Title
RooCmdArg Title(const char *name)
Definition: RooGlobalFunc.cxx:176