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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);

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
}
Double_t fun3(Double_t *x, Double_t *par)
Definition Functions.C:21
Double_t fun4(Double_t x)
Definition Functions.C:26
int Int_t
Definition RtypesCore.h:45
constexpr Bool_t kTRUE
Definition RtypesCore.h:100
@ kGreen
Definition Rtypes.h:66
R__EXTERN TStyle * gStyle
Definition TStyle.h:433
virtual void SetTitleOffset(Float_t offset=1)
Set distance between the axis and the axis title.
Definition TAttAxis.cxx:298
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition TAttFill.h:37
The Canvas class.
Definition TCanvas.h:23
static Int_t GetColor(const char *hexcolor)
Static method returning color number for color specified by hex color string of form: "#rrggbb",...
Definition TColor.cxx:1839
virtual TH1 * GetHistogram() const
Return a pointer to the histogram used to visualise the function Note that this histogram is managed ...
Definition TF1.cxx:1586
virtual void SetNpx(Int_t npx=100)
Set the number of points used to draw the function.
Definition TF1.cxx:3433
A 2-Dim function with parameters.
Definition TF2.h:29
virtual void SetNpy(Int_t npy=100)
Set the number of points used to draw the function.
Definition TF2.cxx:927
void Draw(Option_t *option="") override
Draw this function with its current attributes.
Definition TF2.cxx:259
A 3-Dim function with parameters.
Definition TF3.h:28
TAxis * GetXaxis()
Definition TH1.h:324
TAxis * GetYaxis()
Definition TH1.h:325
virtual void SetTitle(const char *title="")
Set the title of the TNamed.
Definition TNamed.cxx:164
The most important graphics class in the ROOT system.
Definition TPad.h:28
void SetLogz(Int_t value=1) override
Set Lin/Log scale for Z.
Definition TPad.cxx:5998
void Update() override
Update pad.
Definition TPad.cxx:2839
void Modified(Bool_t flag=true) override
Mark pad modified Will be repainted when TCanvas::Update() will be called next time.
Definition TPad.cxx:7255
TVirtualPad * cd(Int_t subpadnumber=0) override
Set Current pad.
Definition TPad.cxx:597
void Draw(Option_t *option="") override
Draw Pad in Current pad (re-parent pad if necessary).
Definition TPad.cxx:1268
A Pave (see TPave) with text, lines or/and boxes inside.
Definition TPaveText.h:21
void SetFrameFillColor(Color_t color=1)
Definition TStyle.h:369
void SetPalette(Int_t ncolors=kBird, Int_t *colors=nullptr, Float_t alpha=1.)
See TColor::SetPalette.
Definition TStyle.cxx:1884
void SetCanvasPreferGL(Bool_t prefer=kTRUE)
Definition TStyle.h:339
return c1
Definition legend1.C:41
return c2
Definition legend2.C:14
Authors
Rene Brun, Timur Pocheptsov

Definition in file glsurfaces.C.