Logo ROOT   6.08/07
Reference Guide
first.C
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1 /// \file
2 /// \ingroup tutorial_graphics
3 /// \notebook -js
4 /// Show some basic primitives.
5 ///
6 /// \macro_image
7 /// \macro_code
8 ///
9 /// \author Rene Brun
10 
11 void first() {
12 
13  TCanvas *nut = new TCanvas("nut", "FirstSession",100,10,700,900);
14  nut->Range(0,0,20,24);
15  nut->SetFillColor(10);
16  nut->SetBorderSize(2);
17 
18  TPaveLabel *pl = new TPaveLabel(3,22,17,23.7,
19  "My first ROOT interactive session","br");
20  pl->SetFillColor(18);
21  pl->Draw();
22 
23  TText t(0,0,"a");
24  t.SetTextFont(62);
25  t.SetTextSize(0.025);
26  t.SetTextAlign(12);
27  t.DrawText(2,20.3,"ROOT is based on CINT, a powerful C/C++ interpreter.");
28  t.DrawText(2,19.3,"Blocks of lines can be entered within {...}.");
29  t.DrawText(2,18.3,"Previous typed lines can be recalled.");
30 
31  t.SetTextFont(72);
32  t.SetTextSize(0.026);
33  t.DrawText(3,17,"Root > float x=5; float y=7;");
34  t.DrawText(3,16,"Root > x*sqrt(y)");
35  t.DrawText(3,14,
36  "Root > for (int i=2;i<7;i++) printf(\"sqrt(%d) = %f\\n\",i,sqrt(i));");
37  t.DrawText(3,10,"Root > TF1 f1(\"f1\",\"sin(x)/x\",0,10)");
38  t.DrawText(3, 9,"Root > f1.Draw()");
39  t.SetTextFont(81);
40  t.SetTextSize(0.018);
41  t.DrawText(4,15,"(float) 13.2288f");
42  t.DrawText(4,13.3,"sqrt(2) = 1.414214");
43  t.DrawText(4,12.7,"sqrt(3) = 1.732051");
44  t.DrawText(4,12.1,"sqrt(4) = 2.000000");
45  t.DrawText(4,11.5,"sqrt(5) = 2.236068");
46  t.DrawText(4,10.9,"sqrt(6) = 2.449490");
47 
48  TPad *pad = new TPad("pad","pad",.2,.05,.8,.35);
49  pad->Draw();
50  pad->cd();
51  pad->SetGrid();
52  TF1 *f1 = new TF1("f1","sin(x)/x",0,10);
53  f1->Draw();
54 }
virtual void Draw(Option_t *option="")
Draw this function with its current attributes.
Definition: TF1.cxx:1086
TVirtualPad * cd(Int_t subpadnumber=0)
Set Current pad.
Definition: TPad.cxx:526
virtual void SetGrid(Int_t valuex=1, Int_t valuey=1)
Definition: TPad.h:318
Base class for several text objects.
Definition: TText.h:33
virtual void Draw(Option_t *option="")
Draw Pad in Current pad (re-parent pad if necessary).
Definition: TPad.cxx:1208
A Pave (see TPave) with a text centered in the Pave.
Definition: TPaveLabel.h:24
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition: TAttFill.h:42
virtual void Range(Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Set world coordinate system for the pad.
Definition: TPad.cxx:4654
The most important graphics class in the ROOT system.
Definition: TPad.h:37
The Canvas class.
Definition: TCanvas.h:41
virtual void Draw(Option_t *option="")
Draw this pavelabel with its current attributes.
Definition: TPaveLabel.cxx:77
1-Dim function class
Definition: TF1.h:149
TF1 * f1
Definition: legend1.C:11
Definition: first.py:1
virtual void SetBorderSize(Short_t bordersize)
Definition: TPad.h:309