Hi Allister,
You must create a TApplication object in your program.
#include "TApplication.h"
int main(int argc, char** argv) {
TApplication myapp("myapp,&argc,argv);
..your code
Note that you can also view your histograms during your event loop,
if at regular intervals, you call
gSystem->ProcessEvents();
Rene Brun
On Sat, 4 Oct 2003,
Allister & Maricel Sanchez wrote:
> Hi,
>
> I've been using TFile, TTree, and TH1D to store data during a Geant4 run
> and it worked fine.
> However, at times I also want to see the histogram on a canvas getting
> filled per event. Could someone point out how I can implement this?
> Simply including the TCanvas.h header and then calling
> TCanvas::Update(), TCanvas::Modified() at the end of each event doesn't
> seem to work, that is, I can't see a canvas.
>
> Thanks in advance,
> Allister Sanchez
> Niigata University, Japan
>
>
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