doc/v606/eval_8C.html

void eval(){


   TCanvas *c1 = new TCanvas("c1");

   c1->Range(0,0,20,10);

   TPaveLabel *pt1 = new TPaveLabel(0.2,4,3,6,"Eval");

   pt1->SetTextSize(0.5);

   pt1->SetFillColor(42);

   pt1->Draw();

   TPaveText *pt2 = new TPaveText(4.5,4,7.8,6);

   pt2->Draw();

   TText *t1 = pt2->AddText("Read Operator");

   TText *t2 = pt2->AddText("number i");

   TPaveText *pt3 = new TPaveText(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 = new TPaveLabel(4,0.5,12,2.5,"return result = value[i]");

   pt4->Draw();

   TArrow *ar1 = new TArrow(6,4,6,2.7,0.02,"|>");

   ar1->Draw();

   TText *t7 = new TText(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 = new TLine(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,"|>");

}