Logo ROOT   6.14/05
Reference Guide
legendautoplaced.C File Reference

Detailed Description

View in nbviewer Open in SWAN 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.

pict1_legendautoplaced.C.png
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->Draw("E");
hpx->GetYaxis()->SetTitle("Y Axis title");
hpx->GetYaxis()->SetTitleOffset(1.3); hpx->GetYaxis()->CenterTitle(true);
hpx->GetXaxis()->SetTitle("X Axis title");
hpx->GetXaxis()->CenterTitle(true);
auto h1 = new TH1D("h1","A green histogram",100,-2.,2.);
h1->FillRandom("gaus", 10000);
h1->Draw("same");
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->Draw("L");
g->SetTitle("This is a TGraph");
g->SetLineColor(kRed);
g->SetFillColor(0);
// TPad::BuildLegend() default placement values are such that they trigger
// the automatic placement.
c4->BuildLegend();
}
Author
Olivier Couet

Definition in file legendautoplaced.C.