Hi Jorge,
Jorge Romao wrote:
>
> Hi
>
> I am new to Root (just 3 days ago I downloaded the 3.04 version for my
> Linux RedHat 7.3 machine). I am using it because (I am working in
> theoretical HEP) I want to make some contour plots. I have however two
> problems:
>
> 1) Draw("Cont4Z") works well but produces a PS file with (or without, I
> do not know what this is) antialias. When seen in gv has a kind of grid
> that does not print but it not very nice.
This is a known problem with gv. You should disable the antialias option
from the gv "State" menu.
>
> 2) Draw("ContZ") does not have that (anti)alias problem but does not the
> correct contours. As I probably am doing something wrong I am including
> below in a very simple macro where you can see what I mean.
>
This is a problem with the "cont" option in some configurations. Use "cont4"
instead when this problem appears.
Rene Brun
> Thanks for the help
>
> Jorge
>
> {
>
> // My Macro contour.C
>
> gROOT->Reset();
> gStyle->SetPalette(1);
> gStyle->SetOptStat(0);
> TGaxis::SetMaxDigits(2);
> gStyle->SetStripDecimals(kFALSE);
>
> MyC = new TCanvas("MyC","",1);
> MyC->SetFillStyle(4000);
> MyC->Divide(2,2);
>
> Float_t x,y,z;
> Int_t nlines = 0;
> TH2F *h2 = new TH2F("h2","",51,-2.,2.,51,-2.,2.);
>
> h2->SetContour(6);
>
> for(Int_t i=0;i<51;i++)
> {
> for(Int_t j=0;j<51;j++)
> {
> x=-2. + 4.*((float) i)/50.;
> y=-2. + 4.*((float) j)/50.;
> z=4.-(x*x +y*y);
> h2->Fill(x,y,z);
> }
> }
>
> gPad->SetRightMargin(0.15);
> gPad->SetLeftMargin(0.15);
> gPad->SetBottomMargin(0.18);
>
> TAxis *xaxis = h2->GetXaxis();
> TAxis *yaxis = h2->GetYaxis();
> TAxis *zaxis = h2->GetZaxis();
>
> xaxis->SetTitle("x");
> yaxis->SetTitle("y");
>
> MyC->cd(1);
> h2->Draw("Cont4Z");
>
> MyC->cd(2);
> h2->Draw("Surf3Z");
>
> MyC->cd(3);
> h2->Draw("ContZ");
>
> MyC->cd(4);
> h2->Draw("Surf2Z");
>
> }
>
> --
> Address:
>
> Instituto Superior Tecnico
> Departamento de Fisica
> Av. Rovisco Pais, 1
> 1049-001 Lisboa, Portugal
>
> Tel. +351 21 841 7778 (Office)
> Fax +351 21 841 9143 (Dep. de Fisica)
> e-mail: jorge.romao@ist.utl.pt (preferred)
> or
> fromao@alfa.ist.utl.pt
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