[Plplot-devel] x01.tcl, pladv

[Vince D. <vi...@sa...>]

The first tcl demo, 'x01.tcl' has a problem if it is called after drawing
a previous demo --- the four plots overwrite whatever was previously drawn
rather than clearing the plot page first.

My reading of the manual:

Advances to the next subpage if sub=0, performing a page advance if there
are no remaining subpages on the current page. If subwindowing isn't being
used, pladv(0) will always advance the page. If sub>0, PLplot switches to
the specified subpage. Note that this allows you to overwrite a plot on
the specified subpage; if this is not what you intended, use pleop
followed by plbop to first advance the page. This routine is called
automatically (with sub=0) by plenv, but if plenv is not used, pladv must
be called after initializing PLplot but before defining the viewport. 

suggests that '$w cmd pladv 0' (as used in x02.tcl, in fact) is the right
fix to this problem.  (Since x01.tcl doesn't use plenv, "pladv must be
called...").

Is this right?

-- Vince

<http://www.santafe.edu/~vince>