markerwarning.C

Go to the documentation of this file.

/// \file
/// \ingroup tutorial_graphics
/// \notebook
/// This script illustrates the danger of using asymmetric symbols.
///
/// \macro_image
///
/// Non-symmetric symbols should be used carefully in plotting.
/// These two graphs show how misleading a careless use of symbols can be.
/// The two plots represent the same data sets but because of a bad symbol
/// choice, the two plots on the top appear further apart than for the bottom
/// example.
/// \author Olivier Couet
 
void markerwarning()
{
   const int Nph = 14;
   double np_ph[Nph] = {353.4, 300.2, 254.3, 215.2, 181.0, 151.3, 125.2, 102.7, 83.3, 66.7, 52.5, 40.2, 30.2, 22.0};
   double nc_ph[Nph] = {3.890, 3.734, 3.592, 3.453, 3.342, 3.247, 3.151,
                        3.047, 2.965, 2.858, 2.701, 2.599, 2.486, 2.328};
   double npe_ph[Nph] = {10.068, 9.004, 8.086, 7.304, 6.620, 6.026, 5.504,
                         5.054,  4.666, 4.334, 4.050, 3.804, 3.604, 3.440};
   double nce_ph[Nph] = {0.235, 0.217, 0.210, 0.206, 0.213, 0.223, 0.239,
                         0.260, 0.283, 0.318, 0.356, 0.405, 0.465, 0.545};
 
   const int Nbr = 6;
   double np_br[Nbr] = {357.0, 306.0, 239.0, 168.0, 114.0, 73.0};
   double nc_br[Nbr] = {3.501, 3.275, 3.155, 3.060, 3.053, 3.014};
   double npe_br[Nbr] = {8.000, 11.000, 10.000, 9.000, 9.000, 8.000};
   double nce_br[Nbr] = {0.318, 0.311, 0.306, 0.319, 0.370, 0.429};
 
   TGraphErrors *phUP = new TGraphErrors(Nph, np_ph, nc_ph, npe_ph, nce_ph);
   TGraphErrors *phDN = new TGraphErrors(Nph, np_ph, nc_ph, npe_ph, nce_ph);
   TGraphErrors *brUP = new TGraphErrors(Nbr, np_br, nc_br, npe_br, nce_br);
   TGraphErrors *brDN = new TGraphErrors(Nbr, np_br, nc_br, npe_br, nce_br);
 
   float Top_margin = 0.;
   float Left_margin = 0.025;
   float Right_margin = 0.005;
   float maxPlotPart = 395;
   float Marker_Size = 1.3;
   int Marker_Style = 8;
 
   float Et_200_Min = 0.71;
   float Et_200_Max = 3.80;
   float Et_130_Min = 1.21;
   float Et_130_Max = 3.29;
 
   float Nc_200_Min = 1.31;
   float Nc_200_Max = 4.30;
   float Nc_130_Min = 1.51;
   float Nc_130_Max = 3.89;
 
   TCanvas *canvasNc = new TCanvas("canvasNc", "Multiplicity", 630, 10, 600, 500);
 
   gStyle->SetOptStat(0);
   canvasNc->SetFillColor(10);
   canvasNc->SetBorderSize(0);
 
   // Primitives in Nc200 pad
   TPad *padNcUP = new TPad("padNcUP", "200 GeV", 0.07, 0.60, 1., 1.00);
   padNcUP->Draw();
   padNcUP->cd();
   padNcUP->SetFillColor(10);
   padNcUP->SetFrameFillColor(10);
   padNcUP->SetBorderSize(0);
   padNcUP->SetLeftMargin(Left_margin);
   padNcUP->SetRightMargin(Right_margin);
   padNcUP->SetTopMargin(Top_margin + 0.005);
   padNcUP->SetBottomMargin(0.00);
 
   TH1F *frameNcUP = new TH1F("frameNcUP", "", 100, 0, maxPlotPart);
   frameNcUP->GetYaxis()->SetLabelOffset(0.005);
   frameNcUP->GetYaxis()->SetLabelSize(0.10);
   frameNcUP->SetMinimum(Nc_200_Min);
   frameNcUP->SetMaximum(Nc_200_Max);
   frameNcUP->SetNdivisions(505, "Y");
   frameNcUP->SetNdivisions(505, "X");
   frameNcUP->Draw();
 
   brUP->SetMarkerStyle(22);
   brUP->SetMarkerSize(2.0);
   brUP->Draw("P");
 
   phDN->SetMarkerStyle(23);
   phDN->SetMarkerSize(2);
   phDN->Draw("P");
 
   canvasNc->cd();
 
   // Primitives in Nc130 pad
   TPad *padNcDN = new TPad("padNcDN", "130 GeV", 0.07, 0.02, 1., 0.60);
   padNcDN->Draw();
   padNcDN->cd();
   padNcDN->SetFillColor(10);
   padNcDN->SetFrameFillColor(10);
   padNcDN->SetBorderSize(0);
   padNcDN->SetLeftMargin(Left_margin);
   padNcDN->SetRightMargin(Right_margin);
   padNcDN->SetTopMargin(Top_margin + 0.005);
   padNcDN->SetBottomMargin(0.30);
 
   TH1F *frameNcDN = new TH1F("frameNcDN", "", 100, 0, maxPlotPart);
   frameNcDN->GetYaxis()->SetLabelOffset(0.005);
   frameNcDN->GetYaxis()->SetLabelSize(0.07);
   frameNcDN->GetXaxis()->SetLabelOffset(0.005);
   frameNcDN->GetXaxis()->SetLabelSize(0.07);
   frameNcDN->SetMinimum(Nc_200_Min);
   frameNcDN->SetMaximum(Nc_200_Max);
   frameNcDN->SetNdivisions(505, "Y");
   frameNcDN->SetNdivisions(505, "X");
   frameNcDN->Draw();
 
   brDN->SetMarkerStyle(23);
   brDN->SetMarkerSize(2.0);
   brDN->Draw("P");
 
   phUP->SetMarkerStyle(22);
   phUP->SetMarkerSize(2);
   phUP->Draw("P");
 
   TLatex t1;
   t1.SetTextFont(12);
   t1.SetTextSize(0.0525);
   t1.DrawLatex(-5, 0.6,
                "Non-symmetric symbols should be used carefully in plotting."
                "These two graphs show how misleading");
   t1.DrawLatex(-5, 0.4,
                "a careless use of symbols can be. The two plots represent "
                "the same data sets but because of a bad");
   t1.DrawLatex(-5, 0.2,
                "symbol choice, the two plots on the top appear further apart "
                "than for the bottom example.");
 
   canvasNc->cd();
}