Re: Re: How to draw circle

Either I have or you have a problem with the glasses !! My circle is a circle and not ellipse.
My guess is that you should probably push some buttons on your screen to rescale the x/y ratio.

Rene Brun

Manoj Kumar Jha wrote:
>
> Hi Rene,
> Thanks for mail. I tried your script. Still, it is drawing an ellipse.
> I am working on detector geometry. I need better accuracy in drawing a
> circle. Is it possible in ROOT ? I am also attaching the figure that I
> got after running the script. Please enlighten me.
>
> With regards,
> manoj
> On Tue, 2005-01-11 at 21:55, Rene Brun wrote:
> > see your example modified below
> >
> > Rene Brun
> >
> >
> > {
> > gROOT->Reset();
> > c1 = new TCanvas("c1");
> > //compute the pad range to get a fix aspect ratio
> > Double_t w = gPad->GetWw()*gPad->GetAbsWNDC();
> > Double_t h = gPad->GetWh()*gPad->GetAbsHNDC();
> > Double_t xmin = 0;
> > Double_t xmax = 2;
> > Double_t ymin = 0;
> > Double_t ymax = xmax*h/w;
> > c1->SetFixedAspectRatio();
> > c1->Range(xmin,ymin,xmax,ymax);
> > TPaveLabel pel(0.1,0.8,0.9,0.95,"Examples of Circle");
> > pel.SetFillColor(42);
> > pel.Draw();
> > TEllipse el1(0.5,0.5,.2,.2);
> > el1.Draw();
> > }
> >
> > Manoj Kumar Jha wrote:
> > >
> > > Dear rooters,
> > > I am trying to draw a circle using the attached script. But, I am
> > > getting an ellipse (the figure is attached). Could you please let me
> > > know where I am committing the mistake ?
> > >
> > > Thanks,
> > > manoj
> > > --
> > > ***************************************************
> > > Manoj Kumar Jha
> > > Research Scholar
> > > Department of Physics & Astrophysics
> > > University of Delhi | Delhi - 110 007 | India
> > > Phone : 91-11-27667036(O)
> > > E-mail: Manoj.Jha_at_cern.ch
> > > ***************************************************
> > >
> > > --------------------------------------------------------------------------------
> > > Name: try.C
> > > try.C Type: text/x-c++
> > > Encoding: 7bit
> > >
> > > Name: figure.ps
> > > figure.ps Type: Postscript Document (application/postscript)
> > > Encoding: 7bit
> --
> ***************************************************
> Manoj Kumar Jha
> Research Scholar
> Department of Physics & Astrophysics
> University of Delhi | Delhi - 110 007 | India
> Phone : 91-11-27667036(O)
> E-mail: Manoj.Jha_at_cern.ch
> ***************************************************
>
> --------------------------------------------------------------------------------
> Name: figure.ps
> figure.ps Type: Postscript Document (application/postscript)
> Encoding: 7bit
Received on Tue Jan 11 2005 - 17:58:50 MET