Re: options drawing multigraphs

Dear Rene,

Thank You very much(!).
That makes things much easier... :)

My very best,
Mateusz

On Thursday 14 April 2005 09:04, Rene Brun wrote:
> GetDrawOption should only be called on a object for which
> you did graph.Draw in the current pad.
>
> To make easier the access to the option specified in TMultiGraph::Add
> I have added a new member function GetGraphDrawOption. Now in CVS.
> see:
> http://root.cern.ch/root/htmldoc/TMultiGraph.html#TMultiGraph:Draw
> http://root.cern.ch/root/htmldoc/src/TMultiGraph.cxx.html#TMultiGraph:GetGr
>aphDr awOption
>
> You can look at the code in this function to adapt it to your case
> in case you cannot use the CVS version.
>
> Rene Brun
>
> On
> Wed, 13 Apr
>
> 2005, Mateusz Ploskon wrote:
> > 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:GetDr
> > > > >awOp 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...

-- 
Mateusz Ploskon
GSI Planckstrasse 1
D-64291 Darmstadt
Tel.: +49-6159-71-2914