Logo ROOT   6.08/07
Reference Guide
eval.C
Go to the documentation of this file.
1 /// \file
2 /// \ingroup tutorial_graphics
3 /// \notebook -js
4 /// This macro produces the flowchart of TFormula::Eval.
5 ///
6 /// \macro_image
7 /// \macro_code
8 ///
9 /// \author Rene Brun
10 
11 void eval(){
12 
13  TCanvas *c1 = new TCanvas("c1");
14  c1->Range(0,0,20,10);
15  TPaveLabel *pt1 = new TPaveLabel(0.2,4,3,6,"Eval");
16  pt1->SetTextSize(0.5);
17  pt1->SetFillColor(42);
18  pt1->Draw();
19  TPaveText *pt2 = new TPaveText(4.5,4,7.8,6);
20  pt2->Draw();
21  TText *t1 = pt2->AddText("Read Operator");
22  TText *t2 = pt2->AddText("number i");
23  TPaveText *pt3 = new TPaveText(9,3.5,17.5,6.5);
24  TText *t4 = pt3->AddText("Apply Operator to current stack values");
25  TText *t5 = pt3->AddText("Example: if operator +");
26  TText *t6 = pt3->AddText("value[i] += value[i-1]");
27  t4->SetTextAlign(22);
28  t5->SetTextAlign(22);
29  t6->SetTextAlign(22);
30  t5->SetTextColor(4);
31  t6->SetTextColor(2);
32  pt3->Draw();
33  TPaveLabel *pt4 = new TPaveLabel(4,0.5,12,2.5,"return result = value[i]");
34  pt4->Draw();
35  TArrow *ar1 = new TArrow(6,4,6,2.7,0.02,"|>");
36  ar1->Draw();
37  TText *t7 = new TText(6.56,2.7,"if i = number of stack elements");
38  t7->SetTextSize(0.04);
39  t7->Draw();
40  ar1->DrawArrow(6,8,6,6.2,0.02,"|>");
41  TLine *l1 = new TLine(12,6.6,12,8);
42  l1->Draw();
43  l1->DrawLine(12,8,6,8);
44  ar1->DrawArrow(3,5,4.4,5,0.02,"|>");
45  ar1->DrawArrow(7.8,5,8.9,5,0.02,"|>");
46 }
47 
virtual void Draw(Option_t *option="")
Draw this pavetext with its current attributes.
Definition: TPaveText.cxx:211
return c1
Definition: legend1.C:41
virtual void DrawArrow(Double_t x1, Double_t y1, Double_t x2, Double_t y2, Float_t arrowsize=0, Option_t *option="")
Draw this arrow with new coordinates.
Definition: TArrow.cxx:139
virtual TText * AddText(Double_t x1, Double_t y1, const char *label)
Add a new Text line to this pavetext at given coordinates.
Definition: TPaveText.cxx:160
virtual TLine * DrawLine(Double_t x1, Double_t y1, Double_t x2, Double_t y2)
Draw this line with new coordinates.
Definition: TLine.cxx:93
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:255
TLatex * t1
Definition: textangle.C:20
virtual void Draw(Option_t *option="")
Draw this arrow with its current attributes.
Definition: TArrow.cxx:122
Base class for several text objects.
Definition: TText.h:33
virtual void SetTextAlign(Short_t align=11)
Set the text alignment.
Definition: TAttText.h:47
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
A simple line.
Definition: TLine.h:33
The Canvas class.
Definition: TCanvas.h:41
A Pave (see TPave) with text, lines or/and boxes inside.
Definition: TPaveText.h:27
virtual void Draw(Option_t *option="")
Draw this pavelabel with its current attributes.
Definition: TPaveLabel.cxx:77
virtual void SetTextColor(Color_t tcolor=1)
Set the text color.
Definition: TAttText.h:49
virtual void SetTextSize(Float_t tsize=1)
Set the text size.
Definition: TAttText.h:52
Draw all kinds of Arrows.
Definition: TArrow.h:35