Re: [WWdevel] help with refreshCachedImages

[Michael G. <ga...@ma...>]

On Aug 12, 2005, at 6:36 PM, John Jones wrote:

> Hi,
>
> There was a discussion on the discussion board stemming from  
> Nandor's problems which generate graphs based on student answers.   
> Part of the resolution was that a problem should always refresh its  
> on the fly graphics if refreshCachedImages is non-zero.
>
> I created a problem and set $refreshCachedImages=1 in the problem.   
> The place to check this is in dangerousMacros.pl.  I have tried  
> $main::refreshCachedImages and $main::PG_FLAGS{refreshCachedImages}  
> (and a few other variations), and I cannot see the value of this  
> variable.
>
> What is the right way to access this value, or is there none?  For  
> example, if the call from the problem to insertGraph is evaluated  
> before ENDDOCUMENT, then any help from ENDDOCUMENT won't be seen.
>
Hi John,


Try  my $refreshedCachedImages =  eval 
( "$main::refreshCachedImages");  I

I think that might work. There are several examples of this kind of  
problem in PG.pl, PGanswermacros.pl and
PGbasicmacros.pl -- all of these are scripts which are precompiled.

The problem is that because dangerousMacros.pl is cached "main::"  
means one thing when
the script is compiled (perhaps main:: is SafeRoot1::   ) and another  
when the problem script is
compiled (main:: is SaveRoot 21::)  so you need to delay evaluation  
of the variable name until
"run time".


See if that works.  I haven't tested it, some experimentation might  
be needed.

Take care,

Mike


> If there is not a reasonable way to access refreshCachedImages,  
> maybe it should be removed since it doesn't have a use (aside from  
> debugging).  Having an optional flag in the graph object for forced  
> refreshing is something I suggested on the discussion board.  We  
> could still do that pretty easily I think.  The call to insertGraph  
> does have access to the graph object.
>
> John
>
>
>
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