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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