Modified

Wouter Hulsbergen (s37@nikhef.nl)
Thu, 26 Mar 1998 14:32:49 +0100 (MET)


Dear Root,

I have divided a canvas in pads with TCanvas::Divide(int,int). In a later
stage I would like to update the canvas, but some of the pads are
modified. However, I do not understand how to tell that to the TCanvas.

More concrete:

TH1F* firsthisto = new TH1F(...);
TH1F* secondhisto = new TH1F(..);
TCanvas* c1 = new TCanvas();
c1->Divide(2,1);
c1->cd(1) ; firsthisto->Draw();
c1->cd(2) ; secondhisto->Draw();
firsthisto->Fill(...);
secondhisto->Fill(...);
c1->Modified();
c1->Update();
// Up to here everything works fine
firsthisto->Fill(...);
secondhisto->Fill(...);
c1->Modified();
c1->Update();
// Now the histograms are not changed.

Probably I need to modify each subpad. However, if I try to access them
with

c1->cd(1); (c1->GetSelectedPad())->Modified();

there is a segmentation fault.

How should I set `modified' for the subpads? Is it possible to set
`modified' for all subpads at once ?

Regards,
Wouter