ROOT_528-00b_version: tutorials/graphs/labels1.C Source File

00001 //Setting alphanumeric labels in a 1-d histogram
00002 //Author; Rene Brun
00003 void labels1()
00004 {
00005    const Int_t nx = 20;
00006    char *people[nx] = {"Jean","Pierre","Marie","Odile",
00007       "Sebastien","Fons","Rene","Nicolas","Xavier","Greg",
00008       "Bjarne","Anton","Otto","Eddy","Peter","Pasha",
00009       "Philippe","Suzanne","Jeff","Valery"};
00010    TCanvas *c1 = new TCanvas("c1","demo bin labels",
00011       10,10,900,500);
00012    c1->SetGrid();
00013    c1->SetBottomMargin(0.15);
00014    TH1F *h = new TH1F("h","test",nx,0,nx);
00015    h->SetFillColor(38);
00016    for (Int_t i=0;i<5000;i++) {
00017       h->Fill(gRandom->Gaus(0.5*nx,0.2*nx));
00018    }
00019    h->SetStats(0);
00020    for (i=1;i<=nx;i++) {
00021       h->GetXaxis()->SetBinLabel(i,people[i-1]);
00022    }
00023    h->Draw();
00024    TPaveText *pt = new TPaveText(0.6,0.7,0.98,0.98,"brNDC");
00025    pt->SetFillColor(18);
00026    pt->SetTextAlign(12);
00027    pt->AddText("Use the axis Context Menu LabelsOption");
00028    pt->AddText(" \"a\"   to sort by alphabetic order");
00029    pt->AddText(" \">\"   to sort by decreasing values");
00030    pt->AddText(" \"<\"   to sort by increasing values");
00031    pt->Draw();
00032 }