doc/v636/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 CLING, 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();

}

ROOT::Detail::TRangeCast
Definition TCollection.h:311

TCanvas
The Canvas class.
Definition TCanvas.h:23

TF1
1-Dim function class
Definition TF1.h:234

TF1::Draw
void Draw(Option_t *option="") override
Draw this function with its current attributes.
Definition TF1.cxx:1341

TPad
The most important graphics class in the ROOT system.
Definition TPad.h:28

TPaveLabel
A Pave (see TPave) with a text centered in the Pave.
Definition TPaveLabel.h:20

TText
Base class for several text objects.
Definition TText.h:22

f1
TF1 * f1
Definition legend1.C:11