Hi,
This is how patterns works. And I guess that is how should be if one
wants to mix patterns (for example hatches in some direction superimposed
with hatches in some other direction). If you want to have a solid
background for your smaller histogram, plot it first as filled (with your
preferred colour) and then plot it again with the pattern you want.
Cheers, O.Couet
--
Org: CERN - European Laboratory for Particle Physics.
Mail: 1211 Geneve 23 - Switzerland
E-Mail: Olivier.Couet@cern.ch Phone: +41 22 7676522
WWW: http://cern.ch/Olivier.Couet/ Fax: +41 22 7677155
On Thu, 3 Oct 2002, Jochen Cammin wrote:
> Dear ROOTers,
>
> I would like to draw two histograms superimposed with different fill
> patterns (either using a THStack or just with the help of Draw("same").
>
> This is illustrated with the small macro below.
>
> One histogram should be printed with FillStyle 3004 and the other one with
> 3005. The problem, however, is that the 'smaller' histogram seems to be
> transparent so that the resulting pattern is the overlay of pattern 3004
> and 3005. This is the same on screen, in the postscript and on the
> printout. I tried to set the transparency with FillStyle 4100, but this has
> no effect at all.
>
> How can I make the 'smaller' histogram being opaque?
>
> [I am using the CVS Version on RH 7.2.1]
>
> Regards,
> Jochen
>
> {
> gROOT->Reset();
> TH1F *h1 = new TH1F("h1","Histo 1",100,-3,3);
> h1->FillRandom("gaus",10000);
> TH1F *h2 = new TH1F("h2","Histo 2",100,-3,3);
> h2->FillRandom("gaus",20000);
>
> h1->SetFillStyle(3004);
> h1->SetFillColor(1);
> h2->SetFillStyle(3005);
> h2->SetFillColor(1);
>
> THStack *hs = new THStack("hs","A stack of histograms");
> hs->Add(h1);
> hs->Add(h2);
>
> // Use this ...
> hs->Draw();
> // ... or this
> //h2->Draw();
> //h1->Draw("same");
>
> // c1->Print("test.ps"); // uncomment to generate a postscript file
> }
>
>
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