doc/v606/first_8C.html

void first() {


   TCanvas *nut = new TCanvas("nut", "FirstSession",100,10,700,900);

   nut->Range(0,0,20,24);

   nut->SetFillColor(10);

   nut->SetBorderSize(2);


   TPaveLabel *pl = new TPaveLabel(3,22,17,23.7,

      "My first ROOT interactive session","br");

   pl->SetFillColor(18);

   pl->Draw();


   TText t(0,0,"a");

   t.SetTextFont(62);

   t.SetTextSize(0.025);

   t.SetTextAlign(12);

   t.DrawText(2,20.3,"ROOT is based on CINT, a powerful C/C++ interpreter.");

   t.DrawText(2,19.3,"Blocks of lines can be entered within {...}.");

   t.DrawText(2,18.3,"Previous typed lines can be recalled.");


   t.SetTextFont(72);

   t.SetTextSize(0.026);

   t.DrawText(3,17,"Root >  float x=5; float y=7;");

   t.DrawText(3,16,"Root >  x*sqrt(y)");

   t.DrawText(3,14,

      "Root >  for (int i=2;i<7;i++) printf(\"sqrt(%d) = %f\\n\",i,sqrt(i));");

   t.DrawText(3,10,"Root >  TF1 f1(\"f1\",\"sin(x)/x\",0,10)");

   t.DrawText(3, 9,"Root >  f1.Draw()");

   t.SetTextFont(81);

   t.SetTextSize(0.018);

   t.DrawText(4,15,"(float) 13.2288f");

   t.DrawText(4,13.3,"sqrt(2) = 1.414214");

   t.DrawText(4,12.7,"sqrt(3) = 1.732051");

   t.DrawText(4,12.1,"sqrt(4) = 2.000000");

   t.DrawText(4,11.5,"sqrt(5) = 2.236068");

   t.DrawText(4,10.9,"sqrt(6) = 2.449490");


   TPad *pad = new TPad("pad","pad",.2,.05,.8,.35);

   pad->Draw();

   pad->cd();

   pad->SetGrid();

   TF1 *f1 = new TF1("f1","sin(x)/x",0,10);

   f1->Draw();

}