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legendautoplaced.C File Reference

Detailed Description

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The legend can be placed automatically in the current pad in an empty space found at painting time.

The following example illustrate this facility. Only the width and height of the legend is specified in percentage of the pad size.

void legendautoplaced()
auto c4 = new TCanvas("c", "c", 600,500);
auto hpx = new TH1D("hpx","This is the hpx distribution",100,-4.,4.);
hpx->FillRandom("gaus", 50000);
hpx->GetYaxis()->SetTitle("Y Axis title");
hpx->GetYaxis()->SetTitleOffset(1.3); hpx->GetYaxis()->CenterTitle(true);
hpx->GetXaxis()->SetTitle("X Axis title");
auto h1 = new TH1D("h1","A green histogram",100,-2.,2.);
h1->FillRandom("gaus", 10000);
auto g = new TGraph();
g->SetPoint(0, -3.5, 100 );
g->SetPoint(1, -3.0, 300 );
g->SetPoint(2, -2.0, 1000 );
g->SetPoint(3, 1.0, 800 );
g->SetPoint(4, 0.0, 200 );
g->SetPoint(5, 3.0, 200 );
g->SetPoint(6, 3.0, 700 );
g->SetTitle("This is a TGraph");
// TPad::BuildLegend() default placement values are such that they trigger
// the automatic placement.
#define g(i)
Definition RSha256.hxx:105
@ kRed
Definition Rtypes.h:66
@ kGreen
Definition Rtypes.h:66
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition TAttLine.h:40
The Canvas class.
Definition TCanvas.h:23
A TGraph is an object made of two arrays X and Y with npoints each.
Definition TGraph.h:41
1-D histogram with a double per channel (see TH1 documentation)
Definition TH1.h:670
virtual void FillRandom(const char *fname, Int_t ntimes=5000, TRandom *rng=nullptr)
Fill histogram following distribution in function fname.
Definition TH1.cxx:3519
void Draw(Option_t *option="") override
Draw this histogram with options.
Definition TH1.cxx:3066
TH1F * h1
Definition legend1.C:5
Olivier Couet

Definition in file legendautoplaced.C.