doc/master/legend3_8C_source.html

{

   TCanvas *c3 = new TCanvas("c2","c2",500,300);


   TLegend* leg = new TLegend(0.2, 0.2, .8, .8);

   TH1* h = new TH1F("", "", 1, 0, 1);


   leg-> SetNColumns(2);


   leg->AddEntry(h, "Column 1 line 1", "l");

   leg->AddEntry(h, "Column 2 line 1", "l");

   leg->AddEntry(h, "Column 1 line 2", "l");

   leg->AddEntry(h, "Column 2 line 2", "l");


   leg->Draw();

   return c3;

}


TCanvas
The Canvas class.
Definition TCanvas.h:23

TH1F
1-D histogram with a float per channel (see TH1 documentation)
Definition TH1.h:622

TH1
TH1 is the base class of all histogram classes in ROOT.
Definition TH1.h:59

TLegend
This class displays a legend box (TPaveText) containing several legend entries.
Definition TLegend.h:23

TLegend::AddEntry
TLegendEntry * AddEntry(const TObject *obj, const char *label="", Option_t *option="lpf")
Add a new entry to this legend.
Definition TLegend.cxx:320

TLegend::Draw
void Draw(Option_t *option="") override
Draw this legend with its current attributes.
Definition TLegend.cxx:425

SetNColumns
leg SetNColumns(2)

c3
return c3
Definition legend3.C:15

leg
TLegend * leg
Definition legend3.C:4

h
TH1 * h
Definition legend3.C:5