One line, two states?

From: Patrick Schemitz (schemitz@ekp.physik.uni-karlsruhe.de)
Date: Fri Sep 11 1998 - 15:03:34 MEST 

Hi Rooters,

I'm experimenting with ROOT and I noticed something I don't understand.
The following piece of code creates a window divided in two pads, and a
line, drawn in both pads.

  gROOT->Reset();

  TCanvas window ("window","Window Title",100,100,300,300);
  window.SetFillColor(4);

  TLine line (0.07,0.07,0.43,0.93);
  line.SetLineColor(12);

  window.cd();
  TPad widget1 ("widget1","Lower Part",0.05,0.05,0.95,0.45,6);
  widget1.Draw();
  widget1.cd();
  line.Draw();

  window.cd();
  TPad widget2 ("widget2","Upper Part",0.05,0.55,0.95,0.95,6);
  widget2.Draw();
  widget2.cd();
  line.Draw();

The strange thing is, if I right-click the line in the lower pad
and modify its attributes (say, change the color), the other view
of the line does _not_ change, even when I iconify and then restore
the window, thus enforcing a X11 repaint event.

Did I duplicate the line by drawing it in two pads? If yes, what if
I did this to a _named_ object?

Cheers,	patrick

--
Patrick Schemitz, schemitz@ekp.physik.uni-karlsruhe.de
University of Karlsruhe (TH), Germany
Faculty for Physics, EKP, Ka'CDF Tracking Group

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