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.
{
auto h2 =
dynamic_cast<TH2F *
>(obj);
if (!h2)
return;
if (!h2->IsHighlight()) {
h2->SetTitle("Disable highlight");
return;
}
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));
}
{
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++)
info =
new TText(0.0, -4.0,
"please move the mouse over the frame");
}
ROOT::Detail::TRangeCast< T, true > TRangeDynCast
TRangeDynCast is an adapter class that allows the typed iteration through a TCollection.
R__EXTERN TRandom * gRandom
2-D histogram with a float per channel (see TH1 documentation)
Mother of all ROOT objects.
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...
const char * Data() const
void Form(const char *fmt,...)
Formats a string using a printf style format descriptor.
Base class for several text objects.
TVirtualPad is an abstract base class for the Pad and Canvas classes.
- Date
- March 2018
- Author
- Jan Musinsky
Definition in file hist043_Graphics_highlight.C.