void makePlot_legend(TLegend* legend, const std::string& outputFilePath, const std::string& outputFileName)
{
  TCanvas* canvas_legend = new TCanvas("canvas_legend", "canvas_legend", 900, 800);
  canvas_legend->SetFillColor(10);
  canvas_legend->SetBorderSize(2);
  canvas_legend->Draw();
  canvas_legend->cd();

  legend->SetX1NDC(0.30);
  legend->SetY1NDC(0.30);
  legend->SetX2NDC(0.80);
  legend->SetY2NDC(0.80);
  legend->SetTextSize(0.070);
  legend->SetMargin(0.20);
  TList* legend_primitives = legend->GetListOfPrimitives();
  TIter legend_nextObj(legend_primitives);
  while ( TObject* obj = legend_nextObj() ) {
    std::string objName = "";
    if ( dynamic_cast<TNamed*>(obj) ) objName = (dynamic_cast<TNamed*>(obj))->GetName();    
    //std::cout << "obj = " << obj << ": name = " << objName << ", type = " << obj->ClassName() << std::endl;

    TLegendEntry* legendEntry = dynamic_cast<TLegendEntry*>(obj);
    if ( legendEntry ) {
      TH1* histogram = dynamic_cast<TH1*>(legendEntry->GetObject());
      if ( histogram ) {
	histogram->SetLineWidth(2*histogram->GetLineWidth());
	histogram->SetMarkerSize(3);
      }
    }
  }
  legend->Draw();

  canvas_legend->Update();

  std::string outputFileName_full = Form("%s%s", outputFilePath.data(), outputFileName.data());
  size_t idx = outputFileName_full.find_last_of('.');
  std::string outputFileName_plot = std::string(outputFileName_full, 0, idx);
  canvas_legend->Print(std::string(outputFileName_plot).append(".pdf").data());
  canvas_legend->Print(std::string(outputFileName_plot).append(".root").data());

  delete canvas_legend;
}
Beispiel #2
0
// A macro to print out a TLegend - can be considered a smarter TLegend::ls().
// If no TLegend pointer is passed, it loops over the TLegends drawn on current TPad.
void PrintLegend(TLegend *leg=0) {
  if ( leg==0 ) {
    if (gROOT->GetListOfCanvases()->GetEntries()==0) return;
    TList *padprim = gPad->GetListOfPrimitives();
    for (int i=0; i<padprim->GetEntries(); i++) {
      TObject *myobj = gROOT->FindObject(padprim->At(i)->GetName());
      if ( myobj != 0 && myobj->InheritsFrom("TLegend") )
	PrintLegend((TLegend*)myobj); }
    return;
  }
  TList *ents = leg->GetListOfPrimitives();
  for (int i=0; i<ents->GetEntries(); i++) {
    TLegendEntry *le = (TLegendEntry*)ents->At(i);
    TString s( le->GetLabel() );
    TObject *obj = le->GetObject();
    if (!obj) continue;  // if no object, this can be the title line, so skip
    TString color = "???";
    if ( obj->InheritsFrom("TH1") )
      color = gROOT->GetListOfColors()->At(((TH1*)obj)->GetLineColor())->GetName();
    cout << "Item ";  cout.width(2); cout.fill('0'); cout << i << " plotted in ";
    cout.width(7); cout.fill(' '); cout << color << " : " << s << endl;
  }
  //leg->ls();
}