Re: options drawing multigraphs

Dear Rene,

By this example I wanted only to suggest/ask if there would be a possibility to iterate on the list of graphs of a multi-graph and internally there add the graph to the gPad or whatever makes the draw option usable... e.g. then one would not have to call the ::Draw() for each of the graphs... If that is not possible... nevermind.

My best,
m.

On Tuesday 12 April 2005 21:10, you wrote:
> Mateusz,
>
> The output you get is what I expect.
> You never called tg1->Draw or tg2->Draw. So calling tg1->GetDrawOption
> or tg1->SetDrawOption does not make sense.
>
> Rene Brun
>
>
> On
> Tue, 12 Apr 2005, Mateusz Ploskon
>
> wrote:
> > Thank You very much for Your answer...
> > But if You could spend a second and execute this macro...
> > In my case the only message which I see is:
> > <TCanvas::MakeDefCanvas>: created default TCanvas with name c1
> > and4 empty lines...
> >
> > {
> > Float_t x[2] = {0, 1};
> > Float_t y[2] = {1, 2};
> > TGraph *tg1 = new TGraph(2, x, y);
> > TGraph *tg2 = new TGraph(2, y, x);
> >
> > TMultiGraph *tgr = new TMultiGraph("tgr", "tgr");
> > tgr->Add(tg1);
> > tgr->Add(tg2);
> >
> > tgr->Draw("ALP");
> >
> > cout << tg1->GetDrawOption() << endl;
> > cout << tg2->GetDrawOption() << endl;
> >
> > gPad->Update();
> >
> > tg1->SetDrawOption("F");
> > tg2->SetDrawOption("F");
> >
> > cout << tg1->GetDrawOption() << endl;
> > cout << tg2->GetDrawOption() << endl;
> >
> > }
> >
> > It seems that the gPad is set but the functions TGraph::Draw() are never
> > called(?) How then the TMultiGraph paints the graphs(?)->(see below)
> >
> > I cannot change the DrawOptions for each of the TGraphs?
> > This is my problem...:
> >
> > void TMultiGraph::Draw(Option_t *option)
> > {
> > //*-*-*-*-*-*-*-*-*-*-*Draw this multigraph with its current
> > attributes*-*-*-*-*-*-*
> > //*-* ==========================================
> > //
> > // Options to draw a graph are described in TGraph::PainGraph
> > //
> > // The drawing option for each TGraph may be specified as an optional
> > // second argument of the Add function.
> > // If a draw option is specified, it will be used to draw the graph,
> > // otherwise the graph will be drawn with the option specified in
> > // TMultiGraph::Draw
> >
> > AppendPad(option);
> > }
> >
> > My best,
> > Mateusz
> >
> > On Tuesday 12 April 2005 15:51, you wrote:
> > > Hi Mateusz,
> > >
> > > before calling object.GetDrawOption, you must have called object.Draw.
> > > See doc at
> > > http://root.cern.ch/root/htmldoc/TObject.html#TObject:GetDrawOption
> > > http://root.cern.ch/root/htmldoc/TObject.html#TObject:SetDrawOption
> > >
> > > For your point about finding the options in a list, see an example at
> > > http://root.cern.ch/root/htmldoc/src/TObject.cxx.html#TObject:GetDrawOp
> > >tion
> > >
> > > Rene Brun
> > >
> > > On
> > >
> > > Tue, 12 Apr 2005, Mateusz Ploskon wrote:
> > > > Please consider following:
> > > >
> > > > root [7] TH1F *alax = new TH1F("alax","alax", 12,10,111);
> > > > root [8] alax->SetOption("la")
> > > > root [9] alax->GetOption()
> > > > (const Option_t* 0x90d16ec)"la"
> > > > root [10] alax->SetDrawOption("la")
> > > > root [11] alax->GetDrawOption()
> > > > (const Option_t* 0xd0b416)""
> > > >
> > > > Actually, my question is how can I get the option of a TGraph which
> > > > is owned by a TMultiGraph...
> > > > What's wrong with the following code(?) for example:
> > > >
> > > > TMultiGraph *tmgr = new ....
> > > > tmgr->Add(..., "L");
> > > > ...
> > > > TList *hlist = (TList*)tmgr->GetListOfGraphs();
> > > > TIter *hiter = new TIter(hlist);
> > > >
> > > > TGraph *hist = 0;
> > > > hiter->Reset();
> > > > while ((hist = (TGraph*)hiter->Next()) != NULL)
> > > > {
> > > > cout << "Draw option?" << hist->GetTitle() << " " <<
> > > > hist->GetDrawOption() << endl; // nothing... :(
> > > > }
> > > >
> > > > On a side I have the impression that this option'ing stuff is a bit
> > > > messy...
> > > >
> > > > my best!
> > > > m.
> > > >
> > > > PS I've read the sources of TObject etc...
Received on Wed Apr 13 2005 - 13:36:14 MEST