Hi Stephane, You cannot place a TButton or any other graphics object in the pad you want to clear. If you want to build a good user interface, I strongly suggest you use the TGxxx classes as illustrated in $ROOTSYS/test/guitest.cxx. TButton was a class implemented before we had the new TGxxx classes. If you want to use TButton, I suggest the following: Assuming a TCanvas c1, create a subpad Buttons and another subpad Work. In Buttons, you draw all your buttons, in Work you draw your graphics objects. You can see an example in function ATLFDisplay::DisplayButtons of the ATLFast package. See URLs: http://root.cern.ch/root/Atlfast.html http://root.cern.ch/root/html224/atlfast/ATLFDisplay.html Rene Brun On Fri, 16 Mar 2001, Stephane Tourneur wrote: > > Deer rooters, > > I'm trying to make a very simple histogramming display using TButtons > inside a TCanvas. I'd want my TCanvas to be cleared and updated by > pressing a button inside this same TCanvas. Doing that I get a > segmentation violation error : I suppose that it is due to the fact that > a TButton's method can't delete the TButton itself... > Does anybody know a simple way to clear and update a TCanvas by pressing a > button situated inside this canvas, without making ROOT angry?? > Thanks a lot, > Stephane > student at Fermilab/CDF for the UC Davis. >
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