Problem with TRootEmbeddedCanvas

ROOT
1

Hi,

I have a standalone gui program, using TRootEmbeddedCanvas, and i can’t do wat i want.
I would like to display Root Tracks with TGeoManager in a TRootEmbeddedCanvas.

#include "MdiTrackAnimation.hxx"
#include <TCanvas.h>
#include <TGeoManager.h>
#include <TFile.h>
#include <TKey.h>
#include <iostream>
using namespace std;

ClassImp(MdiTrackAnimation)

MdiTrackAnimation::MdiTrackAnimation(TGMdiMainFrame *p) : TGMdiFrame(p, 600, 500)
{

//     ec1_ = new TRootEmbeddedCanvas("ec1",this,100,100);
//     this->AddFrame(ec1_, new TGLayoutHints(kLHintsExpandX | kLHintsExpandY));
//     ec1_->GetCanvas()->cd();

    TGeoManager * geom_;

    TFile * f = new TFile("./myfile.root");
    Bool_t fin = kFALSE;
    TKey *key = 0;
    TIter* objIter = new TIter(f->GetListOfKeys());
    while (!fin && (key=(TKey*) objIter->Next()))
    {
        if (strcmp(key->GetClassName(),"TGeoManager") == 0 )
        {
            geom_ = (TGeoManager * )(key->ReadObj());
            fin = kTRUE;
        }
    }

    geom_->SetTminTmax(9e-9, 1e-8);
    geom_->DrawTracks();
    gPad->Modified();
    gPad->Update();

    this->SetWindowIcon(gClient->GetPicture("profile_t.xpm"));
    this->SetMdiHints(kMdiDefaultHints);
    this->SetWindowName("Track Animation");
    this->MapSubwindows();
    this->Layout();
}

This code works fine and open the tracks in a new TCanvas

But if i uncomment the 3 lines at the beginning, it doesn’t work, and i don’t understand why.
The TRootEmbeddedCanvas is diplayed, but empty (white).

Any idea?

Laurent.

2

Hi Laurent,

Please make your .root file available for testing (attach it to your post if it is small, or copy it in a public place from where I can download it). I see no problem creating a TRootEmbeddedCanvas in a TGMdiFrame frame and drawing something there.

Thank you, Ilka

3

Hi,
Here is my root file with tracks included. But i’m not sure the problem come from the root file.

When I just wan’t to display the TGeoManager with

    TGeoManager * geom = new TGeoManager("MyGeom", "MyGeom");
    geom->Edit();

If a Root embedded Canvas is opened, it doesn’t work
But if not, it open a new TCanvas, and it works.
I don’t understand why.

The Root file:
http://dl.free.fr/s4WkI1gb/essai.root

Laurent

4

Here is a simple test

precision: i’m under Linux Mandriva 2006 with root 5.15
test.tar (30 KB)

5

Hi Laurent,

Thank you for providing the file. I will investigate what happens and will let you know.

Best regards, Ilka

6

Hi Laurent,

What you have observed comes from the hard coded behavior in TGeoXXX classes. I have informed the authors.

Cheers, Ilka

7

Hi,

Thank you for your reply.
I have to find an other solution :frowning:

Laurent

8

Hi Laurent,

What you want should be possible and I hope a solution will be found soon. We will keep you informed.

Best regards, Ilka