eval.C: This macro produces the flowchart of TFormula::Eval
{
//
// This macro produces the flowchart of TFormula::Eval
//Author: Rene Brun
gROOT->Reset();
c1 = new TCanvas("c1");
c1->Range(0,0,20,10);
TPaveLabel pt1(0.2,4,3,6,"Eval");
pt1.SetTextSize(0.5);
pt1.SetFillColor(42);
pt1.Draw();
TPaveText pt2(4.5,4,7.8,6);
pt2.Draw();
TText *t1=pt2.AddText("Read Operator");
TText *t2=pt2.AddText("number i");
TPaveText pt3(9,3.5,17.5,6.5);
TText *t4=pt3.AddText("Apply Operator to current stack values");
TText *t5=pt3.AddText("Example: if operator +");
TText *t6=pt3.AddText("value[i] += value[i-1]");
t4.SetTextAlign(22);
t5.SetTextAlign(22);
t6.SetTextAlign(22);
t5.SetTextColor(4);
t6.SetTextColor(2);
pt3.Draw();
TPaveLabel pt4(4,0.5,12,2.5,"return result = value[i]");
pt4.Draw();
TArrow ar1(6,4,6,2.7,0.02,"|>");
ar1.Draw();
TText t7(6.56,2.7,"if i = number of stack elements");
t7.SetTextSize(0.04);
t7.Draw();
ar1.DrawArrow(6,8,6,6.2,0.02,"|>");
TLine l1(12,6.6,12,8);
l1.Draw();
l1.DrawLine(12,8,6,8);
ar1.DrawArrow(3,5,4.4,5,0.02,"|>");
ar1.DrawArrow(7.8,5,8.9,5,0.02,"|>");
}
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