Read a 1-D histogram from a ROOT File and draw it.
We attach (or generate) the ROOT file in $ROOTSYS/tutorials/hsimple.root
or $PWD/hsimple.root
We draw one histogram in different formats.
{
TCanvas *
c1 =
new TCanvas(
"c1",
"Histogram Drawing Options", 200, 10, 700, 900);
TPad *
pad1 =
new TPad(
"pad1",
"The pad with the function", 0.03, 0.62, 0.50, 0.92);
TPad *
pad2 =
new TPad(
"pad2",
"The pad with the histogram", 0.51, 0.62, 0.98, 0.92);
TPad *
pad3 =
new TPad(
"pad3",
"The pad with the histogram", 0.03, 0.02, 0.97, 0.57);
TPaveLabel *title =
new TPaveLabel(0.1, 0.94, 0.9, 0.98,
"Drawing options for one dimensional histograms");
pad1->GetFrame()->SetFillColor(18);
pave->AddText(
"Title and Stats pads");
pave->AddText(
"X and Y axis");
pave->AddText(
"You can modify bin contents");
}
virtual void SetTextFont(Font_t tfont=62)
Set the text font.
A ROOT file is an on-disk file, usually with extension .root, that stores objects in a file-system-li...
static TFile * Open(const char *name, Option_t *option="", const char *ftitle="", Int_t compress=ROOT::RCompressionSetting::EDefaults::kUseCompiledDefault, Int_t netopt=0)
Create / open a file.
TH1 is the base class of all histogram classes in ROOT.
The most important graphics class in the ROOT system.
A Pave (see TPave) with a text centered in the Pave.
void Draw(Option_t *option="") override
Draw this pavelabel with its current attributes.
A Pave (see TPave) with text, lines or/and boxes inside.
Base class for several text objects.
- Date
- August 2021
- Author
- Rene Brun
Definition in file hist015_TH1_read_and_draw.C.