[ROOT] contours, tranparency

From: Bjoern Nadrowski (bn@mpipks-dresden.mpg.de)
Date: Fri Sep 13 2002 - 12:15:22 MEST


Hi, I/m using version 3.03/08 on a linux machine with Suse 8.0.
I have several questions: is there a way to overlay transparent or
semi-transparent filled areas (for example: yellow + blue = green)?
I have not found out the way the transparency works.
When plotting in a session with overlayed completely transparent pads,
and giving to the graphs a SetFillStyle(4000), the Draw("f") results in
no filling of areas at all.
When exporting the canvas to .ps, the area is filled with the correct
color.
But a second graph overlayed (with 4000) does not trasparently overlay
the first one, but paints it completely over (in the ps: in the online
session, it simply does not draw the area). This happens in all the
cases, when using one transparent pad and frame for the first and
another for the second, or when using the same transparetn pad and frame
for both.
My second problem concerns the way the contours option works.
I am able to export the contours for a "contz,list" option, as described
in the manua.
But, for a "cont1,list" option, the contours are drawn nicely, but there
is simply no entry in the ListOfSpecials!
I have seen that in a root session: drawing graphs and looking in the
TBrowser, if there are specials or not.

Are these bugs or how can I do these things?



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