Logo ROOT  
Reference Guide
hlHisto4.C
Go to the documentation of this file.
1/// \file
2/// \ingroup tutorial_hist
3///
4/// This tutorial demonstrates how the highlight mechanism can be used on an histogram.
5/// A 1D histogram is created.
6/// Then an highlight method is connected to the histogram. Moving the mouse
7/// on the histogram will open a new canvas showing in real time a zoom around
8/// the highlighted bin.
9///
10/// \macro_code
11///
12/// \date March 2018
13/// \author Jan Musinsky
14
15TText *info = nullptr;
16TH1 *hz = nullptr;
17
18void HighlightZoom(TVirtualPad *pad, TObject *obj, Int_t xhb, Int_t yhb)
19{
20 auto h = dynamic_cast<TH1F *>(obj);
21 if(!h) return;
22
23 auto Canvas2 = (TCanvas *)gROOT->GetListOfCanvases()->FindObject("Canvas2");
24 if (!h->IsHighlight()) { // after highlight disabled
25 if (Canvas2) delete Canvas2;
26 if (hz) { delete hz; hz = nullptr; }
27 return;
28 }
29
30 if (info) info->SetTitle("");
31
32 if (!Canvas2) {
33 Canvas2 = new TCanvas("Canvas2", "Canvas2", 605, 0, 400, 400);
34 Canvas2->SetGrid();
35 if (hz) hz->Draw(); // after reopen this canvas
36 }
37 if (!hz) {
38 hz = (TH1 *)h->Clone("hz");
39 hz->SetTitle(TString::Format("%s (zoomed)", hz->GetTitle()));
40 hz->SetStats(kFALSE);
41 hz->Draw();
42 Canvas2->Update();
44 }
45
46 Int_t zf = hz->GetNbinsX()*0.05; // zoom factor
47 hz->GetXaxis()->SetRange(xhb-zf, xhb+zf);
48
49 Canvas2->Modified();
50 Canvas2->Update();
51}
52
53void hlHisto4()
54{
55 auto Canvas1 = new TCanvas("Canvas1", "", 0, 0, 600, 400);
56 Canvas1->HighlightConnect("HighlightZoom(TVirtualPad*,TObject*,Int_t,Int_t)");
57
58 auto f1 = new TF1("f1", "x*gaus(0) + [3]*abs(sin(x)/x)", -50.0, 50.0);
59 f1->SetParameters(20.0, 4.0, 1.0, 20.0);
60 auto h1 = new TH1F("h1", "Test random numbers", 200, -50.0, 50.0);
61 h1->FillRandom("f1", 100000);
62 h1->Draw();
63 h1->Fit(f1, "Q");
65 Canvas1->SetGrid();
66
67 info = new TText(0.0, h1->GetMaximum()*0.7, "please move the mouse over the frame");
68 info->SetTextSize(0.04);
69 info->SetTextAlign(22);
70 info->SetTextColor(kRed-1);
71 info->SetBit(kCannotPick);
72 info->Draw();
73
74 Canvas1->Update();
75
76 // configure highlight at the end when histogram is already painted
78}
#define h(i)
Definition: RSha256.hxx:106
int Int_t
Definition: RtypesCore.h:45
const Bool_t kFALSE
Definition: RtypesCore.h:101
@ kGray
Definition: Rtypes.h:65
@ kRed
Definition: Rtypes.h:66
@ kCannotPick
Definition: TObject.h:359
#define gROOT
Definition: TROOT.h:404
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition: TAttText.h:42
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition: TAttText.h:44
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition: TAttText.h:47
virtual void SetRange(Int_t first=0, Int_t last=0)
Set the viewing range for the axis using bin numbers.
Definition: TAxis.cxx:953
The Canvas class.
Definition: TCanvas.h:23
1-Dim function class
Definition: TF1.h:213
virtual void SetParameters(const Double_t *params)
Definition: TF1.h:649
1-D histogram with a float per channel (see TH1 documentation)}
Definition: TH1.h:574
TH1 is the base class of all histogram classes in ROOT.
Definition: TH1.h:58
void SetTitle(const char *title) override
See GetStatOverflows for more information.
Definition: TH1.cxx:6708
TAxis * GetXaxis()
Get the behaviour adopted by the object about the statoverflows. See EStatOverflows for more informat...
Definition: TH1.h:319
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition: TH1.cxx:3523
virtual TFitResultPtr Fit(const char *formula, Option_t *option="", Option_t *goption="", Double_t xmin=0, Double_t xmax=0)
Fit histogram with function fname.
Definition: TH1.cxx:3904
virtual Double_t GetMaximum(Double_t maxval=FLT_MAX) const
Return maximum value smaller than maxval of bins in the range, unless the value has been overridden b...
Definition: TH1.cxx:8420
virtual Int_t GetNbinsX() const
Definition: TH1.h:295
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition: TH1.cxx:3070
virtual void SetHighlight(Bool_t set=kTRUE)
Set highlight (enable/disable) mode for the histogram by default highlight mode is disable.
Definition: TH1.cxx:4465
virtual void SetStats(Bool_t stats=kTRUE)
Set statistics option on/off.
Definition: TH1.cxx:8865
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition: TNamed.cxx:164
const char * GetTitle() const override
Returns title of object.
Definition: TNamed.h:48
Mother of all ROOT objects.
Definition: TObject.h:37
void SetBit(UInt_t f, Bool_t set)
Set or unset the user status bits as specified in f.
Definition: TObject.cxx:696
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:197
static TString Format(const char *fmt,...)
Static method which formats a string using a printf style format descriptor and return a TString.
Definition: TString.cxx:2336
void SetGridColor(Color_t color=0)
Definition: TStyle.h:354
Base class for several text objects.
Definition: TText.h:22
TVirtualPad is an abstract base class for the Pad and Canvas classes.
Definition: TVirtualPad.h:51
TH1F * h1
Definition: legend1.C:5
TF1 * f1
Definition: legend1.C:11