Re: [Plplot-devel] x01.tcl, pladv

[Alan W. I. <ir...@be...>]

Thanks for drawing that problem to my attention.  I confirm it here as well
with the sequence of commands:

pltcl -dev xwin
plinit
source tcldemos.tcl
2
1

However, inserting an extra pladv is only a superficial fix that will cause
problems elsewhere (IMO) because in fact x01.tcl does call pladv already (in
plot1 and plot2 indirectly via plenv and directly in plot3).

I have now narrowed the problem down to plssub.  If you comment that out
the overwriting problem disappears.  So perhaps there is a deeper lying
bug in plssub that should be addressed.

I will look deeper into this.

Alan

email: ir...@be...
phone: 250-727-2902	FAX: 250-721-7715
snail-mail:
Dr. Alan W. Irwin
Department of Physics and Astronomy,
University of Victoria, P.O. Box 3055,
Victoria, British Columbia, Canada, V8W 3P6
__________________________

Linux-powered astrophysics
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On Wed, 3 Jul 2002, Vince Darley wrote:

> 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>
>
>
>
>
>
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