[pstricks] tranparency with psdataplot, psfileplot and pslistplot

[$naKe]

Hello everyone,

PSTricks seems to support very well transparency, throught the options
`opacity` and `strokeopacity`. However, it does not seems to work well
with the functions psdataplot, psfileplot and pslistplot.
First, issuing someting like
          \psfileplot[strokeopacity=.5]{file} ,
indeed makes the resulting line "lighter" and behave like a transparent
object, at the exception that if the line intersects itself, the
intersection does not get "darker", as one would expect when transparent
objects are superimposed.
I understand that this is a minor issue. More problematic is when I want
a scatter plot, with
          \psfileplot[plotstyle=dots,strokeopacity=.5]{file} ,
then *transparency is not applied anymore to the data points*. Same issue
with
          \psfileplot[showpoints=true,strokeopacity=.5]{file} .
Changing the dots (e.g. `dotstyle=o`) does not help.

Any idea to get a scatter plot with transparent points, so that the
areas with more point density get more color density ?

Regards,
Hugo
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