Logo ROOT   6.21/01
Reference Guide
glrose.C
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1 /// \file
2 /// \ingroup tutorial_gl
3 /// Render a TF2 looking like a rose.
4 ///
5 /// It defines and set a user's palette, and use polar system.
6 ///
7 /// \macro_image(nobatch)
8 /// \macro_code
9 ///
10 /// \author Timur Pocheptsov
11 
12 void glrose()
13 {
14  const Int_t paletteSize = 10;
15  Float_t rgb[paletteSize * 3] =
16  {0.80f, 0.55f, 0.40f,
17  0.85f, 0.60f, 0.45f,
18  0.90f, 0.65f, 0.50f,
19  0.95f, 0.70f, 0.55f,
20  1.f, 0.75f, 0.60f,
21  1.f, 0.80f, 0.65f,
22  1.f, 0.85f, 0.70f,
23  1.f, 0.90f, 0.75f,
24  1.f, 0.95f, 0.80f,
25  1.f, 1.f, 0.85f};
26 
27  Int_t palette[paletteSize] = {0};
28 
29  for (Int_t i = 0; i < paletteSize; ++i)
30  palette[i] = TColor::GetColor(rgb[i * 3], rgb[i * 3 + 1], rgb[i * 3 + 2]);
31 
32  gStyle->SetPalette(paletteSize, palette);
33 
35  TCanvas *cnv = new TCanvas("glc", "Surface sample", 200, 10, 600, 550);
36 
37  TPaveLabel *title = new TPaveLabel(0.04, 0.86, 0.96, 0.98,
38  "\"glsurf2pol\" option + user defined palette.");
39  title->SetFillColor(32);
40  title->Draw();
41 
42  TPad *rosePad = new TPad("box", "box", 0.04, 0.04, 0.96, 0.8);
43  rosePad->Draw();
44 
45 
46  TF2 *fun = new TF2("a", "cos(y)*sin(x)+cos(x)*sin(y)", -6, 6, -6, 6);
47  fun->SetContour(paletteSize);
48  fun->SetNpx(30);
49  fun->SetNpy(30);
50  rosePad->cd();
51  fun->Draw("glsurf2pol");
52 }
virtual void Draw(Option_t *option="")
Draw this function with its current attributes.
Definition: TF2.cxx:241
virtual void SetNpx(Int_t npx=100)
Set the number of points used to draw the function.
Definition: TF1.cxx:3432
float Float_t
Definition: RtypesCore.h:53
R__EXTERN TStyle * gStyle
Definition: TStyle.h:410
int Int_t
Definition: RtypesCore.h:41
TVirtualPad * cd(Int_t subpadnumber=0)
Set Current pad.
Definition: TPad.cxx:593
virtual void Draw(Option_t *option="")
Draw Pad in Current pad (re-parent pad if necessary).
Definition: TPad.cxx:1284
void SetCanvasPreferGL(Bool_t prefer=kTRUE)
Definition: TStyle.h:323
A Pave (see TPave) with a text centered in the Pave.
Definition: TPaveLabel.h:20
virtual void SetFillColor(Color_t fcolor)
Set the fill area color.
Definition: TAttFill.h:37
The most important graphics class in the ROOT system.
Definition: TPad.h:29
virtual void SetNpy(Int_t npy=100)
Set the number of points used to draw the function.
Definition: TF2.cxx:932
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:1764
A 2-Dim function with parameters.
Definition: TF2.h:29
The Canvas class.
Definition: TCanvas.h:31
virtual void Draw(Option_t *option="")
Draw this pavelabel with its current attributes.
Definition: TPaveLabel.cxx:77
virtual void SetContour(Int_t nlevels=20, const Double_t *levels=0)
Set the number and values of contour levels.
Definition: TF2.cxx:897
void SetPalette(Int_t ncolors=kBird, Int_t *colors=0, Float_t alpha=1.)
See TColor::SetPalette.
Definition: TStyle.cxx:1645