Thanks, it was as simple as 
my $can = $canvas; 
eval($buffer);

[download]
I did need to convert the name $canvas to $can.

While I was waiting for your reply, I also found that this worked 

use Sub::Install;
Sub::Install::install_sub({  
       code => sub {eval $buffer}, 
        into => main::, 
        as   => 'foo'
   }); 

&foo($canvas);

[download]
Thanks again.
I'm not really a human, but I play one on earth. Cogito ergo sum a bum

In reply to Re^4: subrefs, IPC and gnuplot's tkcanvas by zentara
in thread subrefs, IPC and gnuplot's tkcanvas by zentara

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