[ROOT] Different color palettes within one canvas

From: Andreas Zoglauer (zog@mpe.mpg.de)
Date: Tue May 08 2001 - 17:14:01 MEST 

Hi,

I have two histograms in my canvas and want to define one color palette 
per histogram, e.g. the colors in the first histogram go from black 
to white and in the second from white to black. Unfortunately setting the 
style via gStyle->SetPalette() changes the palettes in all histograms.

Is there any function of type H1D->SetStyle(myStyle) which is unharmed 
when one sets gStyle-values?

Here is an example of the problem:


//////////////////////////////////////////////////////////////////////

{
gROOT->Reset();

TRandom R;
gRandom->SetSeed();
const Int_t kUPDATE = 1000;

c1 = new TCanvas("c1","Canvas",200,200,600,1000);
pad1 = new TPad("pad1","Palette 1",0.05,0.50,0.95,0.95,21);
pad2 = new TPad("pad2","Palette 2",0.05,0.05,0.95,0.45,21);
pad1->Draw();
pad2->Draw();

pad1->cd();

Int_t Color[9] = {10, 19, 18, 17, 16, 15, 14, 13, 12};
gStyle->SetPalette(9, Color);
//pad1->UseCurrentStyle();

TH2D* H1 = new TH2D("H1", "Palette 1", 50,-5,5,50,-5,5);
H1->Draw("CONT4");

for (Int_t i = 0; i < 10000; i++) {
  H1->Fill(gRandom->Gaus(), gRandom->Gaus());
  if (i % kUPDATE == 0) {
    pad1->Modified();
    c1->Update();
  }
}


pad2->cd();

Int_t invColor[9] = {12, 13, 14, 15, 16, 17, 18, 19, 10};
gStyle->SetPalette(9, invColor);
//pad2->UseCurrentStyle();

TH2D* H2 = new TH2D("H1", "Palette 1", 50,-5,5,50,-5,5);
H2->Draw("CONT4");

for (Int_t i = 0; i < 10000; i++) {
  H2->Fill(gRandom->Gaus(), gRandom->Gaus());
  if (i % kUPDATE == 0) {
    H2->Draw("CONT4");
    pad2->Modified();
    c1->Update();
  }
}

// Together:
for (Int_t i = 0; i < 10000; i++) {
  H1->Fill(gRandom->Gaus(), gRandom->Gaus());
  H2->Fill(gRandom->Gaus(), gRandom->Gaus());
  if (i % kUPDATE == 0) {
    pad1->Modified();
    pad2->Modified();
    c1->Update();
  }
}

pad1->Modified();
pad2->Modified();
c1->Update();
}

//////////////////////////////////////////////////////////////////////


Any ideas?

Andreas



----------------------------------------------------------------------
Andreas Zoglauer

MPI fuer extraterrestrische Physik         Phone:    +49/89-30000-3848
Postfach 1312                              Fax:      +49/89-30000-3569
85741 Garching, Germany                    Email:    zog@mpe.mpg.de
----------------------------------------------------------------------

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