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hist043_Graphics_highlight.C File Reference

Detailed Description

This tutorial demonstrates how the highlight mechanism can be used on an histogram.

A 2D histogram is booked an filled with a random gaussian distribution. Then an highlight method is connected to the histogram. Moving the mouse on the histogram will update the histogram title in real time according to the highlighted bin.

TText *info = nullptr;
{
auto h2 = dynamic_cast<TH2F *>(obj);
if (!h2)
return;
if (!h2->IsHighlight()) { // after highlight disabled
h2->SetTitle("Disable highlight");
return;
}
if (info)
info->SetTitle("");
t.Form("bin[%02d, %02d] (%5.2f, %5.2f) content %g", xhb, yhb, h2->GetXaxis()->GetBinCenter(xhb),
h2->GetYaxis()->GetBinCenter(yhb), h2->GetBinContent(xhb, yhb));
h2->SetTitle(t.Data());
pad->Update();
}
{
auto c1 = new TCanvas();
c1->HighlightConnect("HighlightTitle(TVirtualPad*,TObject*,Int_t,Int_t)");
auto h2 = new TH2F("h2", "", 50, -5.0, 5.0, 50, -5.0, 5.0);
for (Int_t i = 0; i < 10000; i++)
h2->Fill(gRandom->Gaus(), gRandom->Gaus());
h2->Draw();
info = new TText(0.0, -4.0, "please move the mouse over the frame");
info->SetTextAlign(22);
info->SetTextColor(kRed + 1);
info->SetBit(kCannotPick);
info->Draw();
c1->Update();
// call after update to apply changes in the histogram painter
h2->SetHighlight();
}
int Int_t
Definition RtypesCore.h:45
@ 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
R__EXTERN TRandom * gRandom
Definition TRandom.h:62
The Canvas class.
Definition TCanvas.h:23
2-D histogram with a float per channel (see TH1 documentation)
Definition TH2.h:307
Mother of all ROOT objects.
Definition TObject.h:41
virtual Double_t Gaus(Double_t mean=0, Double_t sigma=1)
Samples a random number from the standard Normal (Gaussian) Distribution with the given mean and sigm...
Definition TRandom.cxx:275
Basic string class.
Definition TString.h:139
const char * Data() const
Definition TString.h:376
void Form(const char *fmt,...)
Formats a string using a printf style format descriptor.
Definition TString.cxx:2356
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
return c1
Definition legend1.C:41
Date
March 2018
Author
Jan Musinsky

Definition in file hist043_Graphics_highlight.C.