Hi Andrea,
This is now fixed in the SVN trunk.
Thanks for reporting it.
Olivier
-----Original Message-----
From: owner-roottalk_at_root.cern.ch [mailto:owner-roottalk_at_root.cern.ch] On Behalf Of Andrea Massironi
Sent: Wednesday, March 24, 2010 11:07 AM
To: roottalk (Mailing list discussing all aspects of the ROOT system.)
Subject: [ROOT] THStack, gROOT->SetStyle("Plain") and CreateGradientColorTable
Dear Rooters,
I'm using THStack and I get a strange behaviour.
Running the attached macro I get the stacked histogram image with
colours somehow mixed.
The problem doesn't show up if I remove
gROOT->SetStyle("Plain");
or if I set the "nb" less than 77
Int_t nb = 77
of if I do not set at all "CreateGradientColorTable"
TColor::CreateGradientColorTable(Number,Length,Red,Green,Blue,nb);
Did I miss something?
Thanks, Andrea
{
gROOT->Reset(); gROOT->SetStyle("Plain"); UInt_t Number = 3; Double_t Red[Number] = { 1.00, 0.00, 0.00}; Double_t Green[Number] = { 0.00, 1.00, 0.00}; Double_t Blue[Number] = { 1.00, 0.00, 1.00}; Double_t Length[Number] = { 0.00, 0.50, 1.00 }; Int_t nb = 77; //---- 76 is ok ---- 77 NO ---- TColor::CreateGradientColorTable(Number,Length,Red,Green,Blue,nb); TCanvas *c1 = new TCanvas("c1","c1",800,600);h3->FillRandom("gaus",10000);
//-------------------------------------------
TH1F *h1 = new TH1F("h1","Histo 1",100,-5,5); h1->FillRandom("gaus",10000); TH1F *h2 = new TH1F("h2","Histo 2",100,-5,5); h2->FillRandom("gaus",10000); TH1F *h3 = new TH1F("h3","Histo 3",100,-5,5);
//-------------------------------------------
//-------------------------------------------
h1->SetFillStyle(3004); h1->SetFillColor(1); h2->SetFillStyle(3008); h2->SetFillColor(2); h3->SetFillStyle(3004); h3->SetFillColor(3);
//-------------------------------------------
THStack *hs = new THStack("hs","A stack of histograms"); hs->Add(h1); hs->Add(h2); hs->Add(h3);
//-------------------------------------------
TLegend *leg = new TLegend(0.1,0.6,0.4,0.9); leg->AddEntry(h1,"h1","f"); leg->AddEntry(h2,"h2","f"); leg->AddEntry(h3,"h3","f");
//-------------------------------------------
hs->SetTitle("THStack::Draw()"); hs->DrawClone(); leg->DrawClone();
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