Hi Victor, Damir,
There is no need for TH1::SetPainter
You can directly use the static function
TVirtualHistPainter::SetPainter(const char* myPainterClassname)
Once this is called (once per job), TH1::Paint will automatically
invoke your painter.
Note that each histogram has its own painter instance in such a way
that the system can work in a multithreaded environment.
Rene Brun
On Thu, 21 Oct 1999, Victor Perevoztchikov wrote:
> 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
>
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