Logo ROOT   6.21/01
Reference Guide
glsurfaces.C File Reference

Detailed Description

Various surfaces rendered with GL.

This example draws 6 surfaces using OpenGL in pad (one is remake of a classic surfaces.C, another contains 4 surfaces).

The commands used are exactly the same as with a normal pad. The only command to add is: gStyle->SetCanvasPreferGL(true);

pict1_glsurfaces.C.png
pict2_glsurfaces.C.png
void glsurfaces()
{
// after this command all legos surfaces (surf/surf1/surf2/surf4/tf3
// options) are automatically rendered with OpenGL.
TCanvas *c1 = new TCanvas("glc1","Surfaces Drawing Options",200,10,700,900);
c1->SetFillColor(42);
auto title = new TPaveText(0.2, 0.96, 0.8, 0.995);
title->SetFillColor(33);
title->AddText("Examples of Surface options");
title->Draw();
TPad *pad1 = new TPad("pad1","Gouraud shading", 0.03, 0.50, 0.98, 0.95, 21);
TPad *pad2 = new TPad("pad2","Color mesh", 0.03, 0.02, 0.98, 0.48, 21);
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);
// Draw this function in pad1 with Gouraud shading option
pad1->cd();
pad1->SetLogz();
f2->SetFillColor(45);
f2->Draw("glsurf4");
TF2 *f2clone = new TF2("f2clone","x**2 + y**2 - x**3 -8*x*y**4",
-1., 1.2, -1.5, 1.5);
// Draw this function in pad2 with color mesh option
pad2->cd();
pad2->SetLogz();
f2clone->Draw("glsurf1");
//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");
f2clone->GetHistogram()->GetXaxis()->SetTitle("x title");
f2clone->GetHistogram()->GetYaxis()->SetTitle("y title");
f2clone->GetHistogram()->GetXaxis()->SetTitleOffset(1.4);
f2clone->GetHistogram()->GetYaxis()->SetTitleOffset(1.4);
pad1->Modified();
pad2->Modified();
TCanvas *c2 = new TCanvas("glc2","Surfaces Drawing Options with gl",
700,10,700,700);
c2->SetFillColor(42);
c2->Divide(2, 2);
c2->cd(1);
TF2 *fun1 = new TF2("fun1","1000*((sin(x)/x)*(sin(y)/y))+200",
-6., 6., -6., 6.);
fun1->SetNpx(30);
fun1->SetNpy(30);
fun1->Draw("glsurf3");
c2->cd(2);
TF2 *fun2 = new TF2("fun2","cos(y)*sin(x)+cos(x)*sin(y)",
-6., 6., -6., 6.);
fun2->Draw("glsurf1cyl");
c2->cd(3);
TF2 *fun3 = new TF2("fun3","sin(x) / x * cos(y) * y", -6., 6., -6., 6.);
fun3->Draw("glsurfpol");
c2->cd(4);
TF3 *fun4 = new TF3("fun4","sin(x * x + y * y + z * z - 4)",
-2.5, 2.5, -2.5, 2.5, -2.5, 2.5);
Int_t colInd = TColor::GetColor(1.f, 0.5f, 0.f);
fun4->SetFillColor(colInd);
fun4->Draw("gl");//tf3 option
}
Authors
Rene Brun, Timur Pocheptsov

Definition in file glsurfaces.C.