[ROOT] Making Postscript plots without drawing a Canvas

From: Miroslav Helbich (helbich@mail.desy.de)
Date: Tue Jan 07 2003 - 12:19:43 MET 

 Dear rooters,

  I have a following problem. 

 We save the data "online" from a detector using ROOT I/O and files
(*.root). What we want to do now is to make a bunch of plots in a "ps"
format from a batch mode - eg. drawing histograms from the tree into the
Canvas and then saving results as a postcript files all this done WITHOUT
having to display the canvas on the screen.

 How can I do it? As far as I know the canvas constructor immediately
draws the canvas on the screen.

					Miro

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