Draw 2-Dim functions.
Author: Rene Brun
This notebook tutorial was automatically generated with ROOTBOOK-izer from the macro found in the ROOT repository on Wednesday, April 17, 2024 at 11:12 AM.
TCanvas *c1 = new TCanvas("c1","Surfaces Drawing Options",200,10,700,900);
TPaveText *title = new TPaveText(.2,0.96,.8,.995);
title->AddText("Examples of Surface options");
title->Draw();
TPad *pad1 = new TPad("pad1","Gouraud shading",0.03,0.50,0.98,0.95);
TPad *pad2 = new TPad("pad2","Color mesh",0.03,0.02,0.98,0.48);
pad1->Draw();
pad2->Draw();
We generate a 2-D function
TF2 *f2 = new TF2("f2","x**2 + y**2 - x**3 -8*x*y**4",-1,1.2,-1.5,1.5);
f2->SetContour(48);
f2->SetFillColor(45);
Draw this function in pad1 with Gouraud shading option
pad1->cd();
pad1->SetPhi(-80);
pad1->SetLogz();
f2->Draw("surf4");
Draw this function in pad2 with color mesh option
pad2->cd();
pad2->SetTheta(25);
pad2->SetPhi(-110);
pad2->SetLogz();
f2->SetLineWidth(1);
f2->SetLineColor(5);
f2->Draw("surf1");
add axis titles. The titles are set on the intermediate histogram used for visualisation. We must force this histogram to be created, then force the redrawing of the two pads
pad2->Update();
f2->GetHistogram()->GetXaxis()->SetTitle("x title");
f2->GetHistogram()->GetYaxis()->SetTitle("y title");
f2->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);
f2->GetHistogram()->GetYaxis()->SetTitleOffset(1.4);
pad1->Modified();
pad2->Modified();
Draw all canvases
gROOT->GetListOfCanvases()->Draw()