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hist046_Graphics_highlight1D.C
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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
19{
20 auto h = dynamic_cast<TH1F *>(obj);
21 if (!h)
22 return;
23
24 auto Canvas2 = (TCanvas *)gROOT->GetListOfCanvases()->FindObject("Canvas2");
25 if (!h->IsHighlight()) { // after highlight disabled
26 if (Canvas2)
27 delete Canvas2;
28 if (hz) {
29 delete hz;
30 hz = nullptr;
31 }
32 return;
33 }
34
35 if (info)
36 info->SetTitle("");
37
38 if (!Canvas2) {
39 Canvas2 = new TCanvas("Canvas2", "Canvas2", 605, 0, 400, 400);
40 Canvas2->SetGrid();
41 if (hz)
42 hz->Draw(); // after reopen this canvas
43 }
44 if (!hz) {
45 hz = (TH1 *)h->Clone("hz");
46 hz->SetTitle(TString::Format("%s (zoomed)", hz->GetTitle()));
47 hz->SetStats(kFALSE);
48 hz->Draw();
49 Canvas2->Update();
50 hz->SetHighlight(kFALSE);
51 }
52
53 Int_t zf = hz->GetNbinsX() * 0.05; // zoom factor
54 hz->GetXaxis()->SetRange(xhb - zf, xhb + zf);
55
56 Canvas2->Modified();
57 Canvas2->Update();
58}
59
61{
62 auto Canvas1 = new TCanvas("Canvas1", "", 0, 0, 600, 400);
63 Canvas1->HighlightConnect("HighlightZoom(TVirtualPad*,TObject*,Int_t,Int_t)");
64
65 auto f1 = new TF1("f1", "x*gaus(0) + [3]*abs(sin(x)/x)", -50.0, 50.0);
66 f1->SetParameters(20.0, 4.0, 1.0, 20.0);
67 auto h1 = new TH1F("h1", "Test random numbers", 200, -50.0, 50.0);
68 h1->FillRandom("f1", 100000);
69 h1->Draw();
70 h1->Fit(f1, "Q");
72 Canvas1->SetGrid();
73
74 info = new TText(0.0, h1->GetMaximum() * 0.7, "please move the mouse over the frame");
75 info->SetTextSize(0.04);
76 info->SetTextAlign(22);
77 info->SetTextColor(kRed - 1);
78 info->SetBit(kCannotPick);
79 info->Draw();
80
81 Canvas1->Update();
82
83 // configure highlight at the end when histogram is already painted
85}
#define h(i)
Definition RSha256.hxx:106
int Int_t
Definition RtypesCore.h:45
constexpr Bool_t kFALSE
Definition RtypesCore.h:94
@ kGray
Definition Rtypes.h:65
@ kRed
Definition Rtypes.h:66
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
@ kCannotPick
Definition TObject.h:372
#define gROOT
Definition TROOT.h:406
R__EXTERN TStyle * gStyle
Definition TStyle.h:442
The Canvas class.
Definition TCanvas.h:23
1-Dim function class
Definition TF1.h:233
virtual void SetParameters(const Double_t *params)
Definition TF1.h:677
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:645
TH1 is the base class of all histogram classes in ROOT.
Definition TH1.h:59
virtual void FillRandom(TF1 *f1, Int_t ntimes=5000, TRandom *rng=nullptr)
Definition TH1.cxx:3499
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:3875
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:8547
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3037
virtual void SetHighlight(Bool_t set=kTRUE)
Set highlight (enable/disable) mode for the histogram by default highlight mode is disable.
Definition TH1.cxx:4459
Mother of all ROOT objects.
Definition TObject.h:41
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:2378
void SetGridColor(Color_t color=0)
Definition TStyle.h:374
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