Hello,

First of all, the histograms are supposed to be drawn by the automatically generated code.

You don't need (and should not) draw them from a task.
If you do so, the histograms are drawn on the active pad (gPad) which is, in your case, the last pad on a tab.


I added a new feature to ROME development branch.
For using the feature, you can try
 cd $ROMESYS
 git checkout develop
 git pull
 make
 cd your_project
 make build
 make

As you can see in the updated examples/histoGUI/histoGUI.xml, a new option <DrawSamePad>true</DrawSamePad> is 
available.
When it is true, the array of histograms are drawn on the same pad.

If you have any problems, please let me know.

Best regards,

Ryu


> I need some suggestions regarding drawing multiple histograms on the same pad in
> ROME.
> Here is what I have been doing.  I am making a summary histogram online dispaly
> with ARGUS. The displays is gonna show multiple different types of histograms. 
> 
> So I made a module with four different types of histograms all on the same canvas,
> so that I can look at them in real time in an online run.
> 
> Now in one of the histograms, I am looping over multiple banks, so in one of the
> pads, I want to see two different lines of different colors (to indicate two
> different histograms of the same type from two banks). 
> So I used histoGUI.xml (from examples/histoGUI) and used this way of histogram
> and tab declarations:
>   <Tasks>
>                 <Task>
>                         <TaskName>FillHisto</TaskName>
>         <Histogram>
>                                 <HistName>h1_Esum</HistName>
> 
> 
>                                 <HistArraySize>2</HistArraySize>
>                                 <HistFolderName>myhistos</HistFolderName>
>                                 <HistType>TH1F</HistType>
> 
>                                 <HistXLabel>ESum</HistXLabel>
>                                 <HistYLabel>Entries</HistYLabel>
>                                 <HistXNbins>300</HistXNbins>
>                                 <HistXmin>0</HistXmin>
>                                 <HistXmax>3.1</HistXmax>
> </Histogram>               
> 
> 
> 
> 
> <Histogram>
>                                 <HistName>h1_amplitude</HistName>
>                                 <HistFolderName>myotherhistos</HistFolderName>
>                                  <HistArraySize>108</HistArraySize>
> 
> 
>                                 <HistType>TH1F</HistType>
>                                 <HistXLabel>Amplitude</HistXLabel>
>                                 <HistYLabel>Entries</HistYLabel>
>                                 <HistXNbins>4096</HistXNbins>
>                                 <HistXmin>-0.5</HistXmin>
>                                 <HistXmax>4095.5</HistXmax>
>                                 <Argus>
>                                         <Tab>
>                                                 <TabName>GeneratedHisto</TabName>
>                                               
> <ObjectArrayIndex>0</ObjectArrayIndex>
> 
>                                                 <Index>1</Index>
>                                         </Tab>
>                                 </Argus>
>                         </Histogram>
> 
> etc. and two other histograms have been defined in the same way.
> 
> And then in the src/task: HGUITFillHisto.cpp
> I added this: (to draw two histograms on the same pad)
> 
>           if(icalo==1)
>             {
>           Geth1_EsumAt(0)->Fill(0.00009118*sum);
> 
>           Geth1_EsumAt(0)->SetLineColor(3);
> 
>              }
> 
>           Geth1_EsumAt(0)->Draw();
> 
>           if(icalo==2)
>             {
>           Geth1_EsumAt(1)->Fill(0.00009118*sum);
> 
>             }
> 
>           Geth1_EsumAt(1)->Draw("same");
> 
> And attached is the screen shot from ARGUS.
> 
> Now the problem is: when I add the Draw() and Draw("same") codes in the src/task
> code, it always creates two copies of the same pad. The 0th pad and the very last
> pad. So what ever is on the last pad in the attachment is being replaced by the
> same copy of the 0th pad. I kept chaning the Index number in histoGUI.xml, but what
> ever I do, if I try to draw two histograms on the same pad and add those codes in
> the srdc/task .cpp file, it always creates two copies.
> 
> I don't know where to look at to fix the problem.
> 
> Is there any other way I can add multiple histograms on a pad, while keeping the
> other pads on the canvas intact?
> 
> Any help on this issue will be much appreciated.