logscales.C

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/// \file
/// \ingroup tutorial_graphics
/// \notebook
/// \preview Draw parametric functions with log scales.
///
/// \macro_image
/// \macro_code
///
/// \date July 2016
/// \author Olivier Couet
 
void logscales()
{
   TCanvas *c1 = new TCanvas("c1", "Various options on LOG scales plots", 0, 0, 700, 900);
   c1->SetFillColor(30);
 
   TPad *pad1 = new TPad("pad1", "pad1", 0.03, 0.62, 0.50, 0.92, 32);
   TPad *pad2 = new TPad("pad2", "pad2", 0.51, 0.62, 0.98, 0.92, 33);
   TPad *pad3 = new TPad("pad3", "pad3", 0.03, 0.02, 0.97, 0.535, 38);
   pad1->Draw();
   pad2->Draw();
   pad3->Draw();
 
   TPaveLabel *title = new TPaveLabel(0.1, 0.94, 0.9, 0.98, "Various options on LOG scales plots");
   title->SetFillColor(16);
   title->SetTextFont(42);
   title->Draw();
 
   TPaveText *pave = new TPaveText(0.1, 0.55, 0.9, 0.61);
   pave->SetFillColor(42);
   pave->SetTextAlign(12);
   pave->SetTextFont(42);
   pave->AddText("When more Log labels are requested, the overlapping labels are removed");
   pave->Draw();
 
   pad1->cd();
   pad1->SetLogy();
   pad1->SetGridy();
   TF1 *f1 = new TF1("f1", "x*sin(x)*exp(-0.1*x)+15", -10., 10.);
   TF1 *f2 = new TF1("f2", "(sin(x)+cos(x))**5+15", -10., 10.);
   TF1 *f3 = new TF1("f3", "(sin(x)/(x)-x*cos(x))+15", -10., 10.);
   f1->SetLineWidth(1);
   f1->SetLineColor(2);
   f2->SetLineWidth(1);
   f2->SetLineColor(3);
   f3->SetLineWidth(1);
   f3->SetLineColor(4);
   f1->Draw();
   f2->Draw("same");
   f3->Draw("same");
   f1->GetYaxis()->SetMoreLogLabels();
   TPaveText *pave1 = new TPaveText(-6, 2, 6, 6);
   pave1->SetFillColor(42);
   pave1->SetTextAlign(12);
   pave1->SetTextFont(42);
   pave1->AddText("Log scale along Y axis.");
   pave1->AddText("More Log labels requested.");
   pave1->Draw();
 
   pad2->cd();
   double x[10] = {200, 300, 400, 500, 600, 650, 700, 710, 900, 1000};
   double y[10] = {200, 1000, 900, 400, 500, 250, 800, 150, 201, 220};
   TGraph *g_2 = new TGraph(10, x, y);
   g_2->Draw("AL*");
   g_2->SetMarkerColor(2);
   g_2->GetYaxis()->SetMoreLogLabels();
   g_2->GetYaxis()->SetNoExponent();
   pad2->SetLogy();
   g_2->GetXaxis()->SetMoreLogLabels();
   pad2->SetLogx();
   pad2->SetGridx();
   TPaveText *pave2 = new TPaveText(150, 80, 500, 180);
   pave2->SetFillColor(42);
   pave2->SetTextFont(42);
   pave2->SetTextAlign(12);
   pave2->AddText("Log scale along X and Y axis.");
   pave2->AddText("More Log labels on both.");
   pave2->AddText("No exponent along Y axis.");
   pave2->Draw();
 
   pad3->cd();
   pad3->SetGridx();
   pad3->SetGridy();
   pad3->SetLogy();
   pad3->SetLogx();
   TF1 *f4 = new TF1("f4a", "x*sin(x+10)+25", 1, 21);
   f4->SetLineWidth(1);
   f4->Draw();
   f4->SetNpx(200);
   f4->GetYaxis()->SetMoreLogLabels();
   f4->GetXaxis()->SetMoreLogLabels();
   f4 = new TF1("f4b", "x*cos(x+10)*sin(x+10)+25", 1, 21);
   f4->SetLineWidth(1);
   f4->Draw("same");
   f4->SetNpx(200);
   Int_t a = 20;
   for (int i = a; i >= 1; i--) {
      f4 = new TF1(Form("f4b_%d", i), "x*sin(x+10)*[0]/[1]+25", 1, 21);
      f4->SetParameter(0, i);
      f4->SetParameter(1, a);
      f4->SetNpx(200);
      f4->SetLineWidth(1);
      f4->SetLineColor(i + 10);
      f4->Draw("same");
      f4 = new TF1(Form("f4c_%d", i), "x*cos(x+10)*sin(x+10)*[0]/[1]+25", 1, 25);
      f4->SetParameter(0, i);
      f4->SetParameter(1, a);
      f4->SetNpx(200);
      f4->SetLineWidth(1);
      f4->SetLineColor(i + 30);
      f4->Draw("same");
   }
   TPaveText *pave3 = new TPaveText(1.2, 8, 9, 15);
   pave3->SetFillColor(42);
   pave3->AddText("Log scale along X and Y axis.");
   pave3->SetTextFont(42);
   pave3->SetTextAlign(12);
   pave3->AddText("More Log labels on both.");
   pave3->AddText("The labels have no exponents (they would be 0 or 1)");
   pave3->Draw();
}