Hi, Rene & All:
I've seen a few times about the Update() on this list. Could anybody
explain under what conditions this TCanvas:Update() need to be called?
Thanks!
Aihong
On Tue, 19 Dec 2000, Rene Brun wrote:
> Andre,
> Add the line
> c5->Update();
> after the line
> c5->Divide(3,2);
>
> Otherwise, when you call gROOT->GetSelectedPad, there is no canvas
> "Paint" at this time.
>
> Rene Brun
>
> Andre Holzner wrote:
> >
> > Hello,
> >
> > what am I doing wrong with this macro ?
> > The first time I run it, it produces an empty canvas
> > (and I see the complaint messages). Running it again,
> > I get a new canvas with all the frames in it (as I
> > want them). Can anybody reproduce the problem ?
> >
> > void test()
> > {
> > TCanvas *c5 = new TCanvas;
> > c5->cd();
> > c5->Divide(3,2);
> >
> > int i;
> > for (i=0; i<6; ++i)
> > {
> > c5->cd(i+1);
> >
> > TPad *pad = gROOT->GetSelectedPad();
> > if (pad == NULL)
> > cout << "GetSelectedPad() returns NULL" << endl;
> > else
> > pad->DrawFrame(105,-8,120,8);
> > }
> > }
> >
> > thanks for looking at it,
> >
> > Andre
> >
> > --
> > ------------------+----------------------------------
> > Andre Holzner | +41 22 76 76750
> > Bureau 32 2-C13 | Building 32
> > CERN | Office 2-C13
> > CH-1211 Geneve 23 | http://wwweth.cern.ch/~holzner/
>
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