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Reference Guide
multipalette.C File Reference

Detailed Description

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Draw color plots using different color palettes.

As only one palette is active, one need to use TExec to be able to display plots using different palettes on the same pad.

When a pad is painted, all its elements are painted in the sequence of Draw calls (See the difference between Draw and Paint in the TPad documentation); for TExec it executes its command - which in the following example sets palette for painting all objects painted afterwards. If in the next pad another TExec changes the palette, it doesn’t affect the previous pad which was already painted, but it will affect the current and those painted later.

The following macro illustrate this feature.

#include "TStyle.h"
#include "TColor.h"
#include "TF2.h"
#include "TExec.h"
#include "TCanvas.h"
void Pal1()
{
static Int_t colors[50];
static Bool_t initialized = kFALSE;
Double_t Red[3] = { 1.00, 0.00, 0.00};
Double_t Green[3] = { 0.00, 1.00, 0.00};
Double_t Blue[3] = { 1.00, 0.00, 1.00};
Double_t Length[3] = { 0.00, 0.50, 1.00 };
if(!initialized){
Int_t FI = TColor::CreateGradientColorTable(3,Length,Red,Green,Blue,50);
for (int i=0; i<50; i++) colors[i] = FI+i;
initialized = kTRUE;
return;
}
}
void Pal2()
{
static Int_t colors[50];
static Bool_t initialized = kFALSE;
Double_t Red[3] = { 1.00, 0.50, 0.00};
Double_t Green[3] = { 0.50, 0.00, 1.00};
Double_t Blue[3] = { 1.00, 0.00, 0.50};
Double_t Length[3] = { 0.00, 0.50, 1.00 };
if(!initialized){
Int_t FI = TColor::CreateGradientColorTable(3,Length,Red,Green,Blue,50);
for (int i=0; i<50; i++) colors[i] = FI+i;
initialized = kTRUE;
return;
}
}
void multipalette() {
TCanvas *c3 = new TCanvas("c3","C3",0,0,600,400);
c3->Divide(2,1);
TF2 *f3 = new TF2("f3","0.1+(1-(x-2)*(x-2))*(1-(y-2)*(y-2))",1,3,1,3);
f3->SetLineWidth(1);
c3->cd(1);
f3->Draw("surf1");
TExec *ex1 = new TExec("ex1","Pal1();");
ex1->Draw();
f3->Draw("surf1 same");
c3->cd(2);
f3->Draw("surf1");
TExec *ex2 = new TExec("ex2","Pal2();");
ex2->Draw();
f3->Draw("surf1 same");
}
bool Bool_t
Definition: RtypesCore.h:63
int Int_t
Definition: RtypesCore.h:45
const Bool_t kFALSE
Definition: RtypesCore.h:101
double Double_t
Definition: RtypesCore.h:59
const Bool_t kTRUE
Definition: RtypesCore.h:100
@ kBlack
Definition: Rtypes.h:65
R__EXTERN TStyle * gStyle
Definition: TStyle.h:414
Color * colors
Definition: X3DBuffer.c:21
virtual void SetLineWidth(Width_t lwidth)
Set the line width.
Definition: TAttLine.h:43
virtual void SetLineColor(Color_t lcolor)
Set the line color.
Definition: TAttLine.h:40
The Canvas class.
Definition: TCanvas.h:23
static Int_t CreateGradientColorTable(UInt_t Number, Double_t *Stops, Double_t *Red, Double_t *Green, Double_t *Blue, UInt_t NColors, Float_t alpha=1., Bool_t setPalette=kTRUE)
Static function creating a color table with several connected linear gradients.
Definition: TColor.cxx:2371
TExec is a utility class that can be used to execute a C++ command when some event happens in a pad.
Definition: TExec.h:28
A 2-Dim function with parameters.
Definition: TF2.h:29
void Draw(Option_t *option="") override
Draw this function with its current attributes.
Definition: TF2.cxx:259
virtual void Draw(Option_t *option="")
Default Draw method for all objects.
Definition: TObject.cxx:267
void SetPalette(Int_t ncolors=kBird, Int_t *colors=nullptr, Float_t alpha=1.)
See TColor::SetPalette.
Definition: TStyle.cxx:1781
return c3
Definition: legend3.C:15
Author
Olivier Couet

Definition in file multipalette.C.