> Hi Rooters,
>
> we clearly did not describe clearly enough how to derive from
> TVirtualHistPainter or from THistPainter and how to make your new
> painter the default painter.
>
> Assume you want to modify the existing default THistPainter:
>
> - class TMyHistPainter : public THistPainter { ... };
> override only the few paint methods you want to change
>
> - compile into a shared lib libMyHistPainter.so
>
> - in rootlogon.C add the following:
>
> > // make sure the base class is loaded
> > gROOT->LoadClass("THistPainter","HistPainter");
> > gROOT->LoadClass("TMyHistPainter", MyHistPainter");
> > TVirtualHistPainter::SetPainter("TMyHistPainter");
> >
> > - from now on all histograms will be painted using the new TMyHistPainter.
> >
Hello, Fons,
I understood the original problem / question slightly different.
One complained:
> > > > Since it is static, I cannot change it without
> > > > changing also the painter for regular TH1.
Sounds like the user does want to use very standard "painter" to all
histograms excluding a few of them. Those he wants to paint with his/her
own painter.
To achieve this goal he is to be provided with one extra method TH1::Painter()
described below.
Cheers, Valery
> > Cheers, Fons.
> >
> >
> >
> >
> > >
> > > Hi Damir,
> > > in new TH1 class no method SetPainter(TVirtualHistPainter *userPainter);
> > > If Rene & Fons will add it, then you can create your painter
> > > object derived from TVirtualHistPainter and set it to histogram.
> > >
> > > As a temporary solution you can use the following "barbaric" function
> > > to add your method to histogram. When rene will add SetPainter to TH1
> > > then you can remove it.
> > >
> > > void SetPainter(TH1 *h,TVirtualHistPainter *p)
> > > {
> > > TVirtualHistPainter **s = (TVirtualHistPainter **)((int*)h+117);
> > > p->SetHistogram(h);
> > > *s = p;
> > > }
> > >
> > > Victor
> > >
> > > "Valeri Fine (Faine)" wrote:
> > > >
> > > > ----- Original Message -----
> > > > From: Valeri Fine (Faine) <fine@bnl.gov>
> > > > To: Damir Buskulic <buskulic@lapp.in2p3.fr>; ROOT mailing list <roottalk@hpsalo.cern.ch>
> > > > Subject: Re: painting an object derived from TH1
> > > >
> > > > ----- Original Message -----
> > > > From: Damir Buskulic <buskulic@lapp.in2p3.fr>
> > > > To: ROOT mailing list <roottalk@hpsalo.cern.ch>
> > > > Subject: painting an object derived from TH1
> > > >
> > > > > Hi,
> > > > >
> > > > > with the new library scheme of ROOT, the Painter and Hist are separated.
> > > > > I have a class that derives from TH1F, but I would like to paint some
> > > > > parts differently, namely the stat box. Before, I was just overloading
> > > > > the TH1::PaintStats method.
> > > > > How can I do it now ? Do I have to specify a completely different
> > > > > painter that I have to rewrite ? I looked a little bit at the code and
> > > > > found that the static member fgPainter was holding the class description
> > > > > of the current Painter. Since it is static, I cannot change it without
> > > > > changing also the painter for regular TH1.
> > > > > I suppose I'll just put regular stats off and overlay my own stat box.
> > > > >
> > > > > Any other ideas ?
> > > >
> > > > I missed one essential point, one has to add
> > > > fPainter->StHistogram(this) ;
> > > > statement to get:
> > > >
> > > >
> > > > class TMyHist : public TH1 {
> > > > public:
> > > > TVirtualHistPainter * Painter(TVirtualHistPainter *myPainter) {
> > > > TVirtualHistPainter * old = fPainter;
> > > > fPainter = myPainter;
> > > > if (fPainter) fPainter->SetHistogram(this) ;
> > > > return old;
> > > > }
> > > > }
> > > >
> > > > Afterwards you can define your own painter and attach it to your particular
> > > > histogram. This way you may use either standard or your own Painter with each
> > > > other Update step or for different TPads.
> > > >
> > > > Another solution:
> > > >
> > > > class TMyHist : public TH1 {
> > > > public:
> > > > TVirtualHistPainter * Painter(TVirtualHistPainter *myPainter) {
> > > > delete fPainter; fPainter = 0;
> > > > if (myPainter) {
> > > > fPainter = myPainter;
> > > > fPainter->SetHistogram(this) ;
> > > > }
> > > > return fPainter ;
> > > > }
> > > > }
> > > >
> > > > Valery
> > >
> > > --
> > > Victor M. Perevoztchikov perev@bnl.gov perev@vxcern.cern.ch
> > > Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000
> > > tel office : 516-344-7894; fax 516-344-4206; home 516-345-2690
> > >
> >
> >
> > --
> > Org: CERN, European Laboratory for Particle Physics.
> > Mail: 1211 Geneve 23, Switzerland
> > E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248
> > WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
> >
>
>
>
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