logscales.C: Draw parametric functions with log scales

void logscales() {
//Draw parametric functions with log scales
//Author: Olivier Couet
   
   TCanvas *c1 = new TCanvas("c1",
      "Various options on LOG scales plots",0,0,700,900);
   c1->SetFillColor(30);

   pad1 = new TPad("pad1","pad1",0.03,0.62,0.50,0.92,32);
   pad2 = new TPad("pad2","pad2",0.51,0.62,0.98,0.92,33);
   pad3 = new TPad("pad3","pad3",0.03,0.02,0.97,0.535,38);
   pad1->Draw(); pad2->Draw(); pad3->Draw();

   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();

   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 overlaping \
      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->SetTitle("");
   f1->Draw();
   f2->Draw("same");
   f3->Draw("same");
   f1->GetYaxis()->SetMoreLogLabels();
   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 };
   g_2 = new TGraph(10,x,y);
   //g_2->SetTitle("");
   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();
   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->SetTitle("");
   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");
   }
   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();
}