//Show some basic primitives //Author: Rene Brun 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 CINT, 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\",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,"(double)1.322875655532e+01"); 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->SetFillColor(42); pad->SetFrameFillColor(33); pad->SetBorderSize(10); pad->Draw(); pad->cd(); pad->SetGrid(); TF1 *f1 = new TF1("f1","sin(x)/x",0,10); f1->Draw(); nut->cd(); }