Re: BuildLegend and gPad

It is now added in TVirtualPad (in the trunk)

Cheers,
Olivier

On Dec 8, 2011, at 3:10 PM, Olivier Couet wrote:

> GPad was converted from TPad to TVirtual some times ago.
> And BuildLegend is only in TPad.
> I am now putting it in TVirtualPad too.
>
> -----Original Message-----
> From: Andrea Massironi
> Sent: Thursday, December 08, 2011 3:10 PM
> To: pcanal_at_fnal.gov
> Cc: Axel Naumann; Olivier Couet; roottalk (Mailing list discussing all aspects of the ROOT system.)
> Subject: Re: [ROOT] BuildLegend and gPad
>
> Thank you to everybody!
>
> My only remaining curiosity is why in the previous releases it worked.
>
> In the previous ROOT release*, gPad (the class TVirtualPad) had the method BuildLegend (for example using tab completion of "gPad->" I could see "BuildLegend", while now it doesn't).
>
> Thanks,
> Andrea
>
>
> * I tried with tags/v5-30-00_at_40062
>
>
>
> On 12/08/2011 02:34 PM, Philippe Canal wrote:

>> Hi,
>> 
>> The problem is not really about CINT.
>> It strictly due to the fact that TVirtualPad (the type pointed to by
>> gPad)
>> does *not* have a BuildLegend member function.
>> 
>> Cheers,
>> Philippe.
>> 
>> 
>> 
>> On 12/8/11 4:45 AM, Axel Naumann wrote:
>>> Hi Olivier,
>>> 
>>> How's that CINT-related? I don't see any TVirtualPad::BuildLegend().
>>> Should it be added?
>>> 
>>> Cheers, Axel.
>>> 
>>> 
>>> Olivier Couet wrote on 12/07/2011 09:55 AM:
>>>> I see the same behavior on my Mac.
>>>> Seems to me it is CINT related as the message tells that BuildLegend 
>>>> cannot be called.
>>>> 
>>>> I would also recommend you create your histograms with "new" as you 
>>>> are using "->"
>>>> to access the Draw(0 method:
>>>> 
>>>> void buildlegend()
>>>> {
>>>>  TH1F *h1 = new TH1F("h1","h1",100,-2,2);
>>>>  TH1F *h2 = new TH1F("h2","h2",100,-2,2);
>>>> 
>>>>  h1->FillRandom("gaus",10000);
>>>>  h2->FillRandom("gaus",10000);
>>>> 
>>>>  h1->SetLineColor(kRed);
>>>>  h2->SetLineColor(kBlue);
>>>> 
>>>>  TCanvas* cc = new TCanvas ("cc","cc",400,400);
>>>>  h1->Draw();
>>>>  h2->Draw("same");
>>>> 
>>>>  TLegend* leg = cc->BuildLegend();
>>>>  leg->SetFillColor(kWhite);
>>>>  cc->SetGrid();
>>>> }