ROHLFS Reiner wrote: > > Hi ROOT Team, > > I want to write a TCanvas object into a root file and read it back using the > TCanvas::Draw() function to display the TCanvas - Window again on the screen. > I noticed some problems: > > - The TCanvas which is read from the root file always has a menu bar > independent of the style of the original TCanvas which was written to the root > file. ( Properly the function call in TCanvas::Draw() of > fCanvasImp->ShowMenuBar(1) should be modified to > fCanvasImp->ShowMenuBar(fMenuBar)) This attribute is currently not saved/restored in TCanvas::Streamer. I will add it and also make the mods in TCanvas::Draw. > > - The size and the position of the TCanvas read from the root file has changed > compared to the size and the position of the original TCanvas which was written > to the root file. On my system the Y - Position is +7 Pixel, the Y - Position > is +50 Pixel, the Width is -4 Pixel and the Height is - 28 Pixel each time I > save a TCanvas Window and read it back from the root file. > > - After the user has moved the window on the screen the old X/Y positions are > written to the root file, not the new ones. I can update the X/Y positions > (fCtopX and fCtopY) each time before I write the TCanvas into a root file but > it may be better to update these values each time a user moves the window. This part could also be implemented, however this requires several changes in TCanvas. We will look into it. Thanks for the remarks. Rene Brun
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