I've been building a Perl CGI-based dashboard that uses Google Charts, and have converted Ben Dodson's PHP script for Google extended encoding into a Perl subroutine, and added a scaling function too.

Hopefully it's useful for anyone using Perl and Google Charts with extended encoding.To use it, call the sub with a string that contains your non-encoded values, delimited by ',' for series values and '|' for delimiting the series. For example:

use POSIX;
use List::Util qw[min max];

my $chartValues = "12,104,1371|53,22,1100";
my $encodedValues = encoding($chartValues);

sub encoding
{
    my @characters = qw(A B C D E F G H I J K L M N O P Q R S T U V W 
+X Y Z a b c d e f g h i j k l m n o p q r s t u v w x y z 0 1 2 3 4 5
+ 6 7 8 9 - .);
    my @series = split(/\|/,$_[0]);
    my @seriesmax = split(/\||\,/,$_[0]);
    my $max = max(@seriesmax);
    my $returnstring = '';
        foreach (@series){
        my @values = split(/\,/,$_);
        my $encoding = '';
            foreach my $value (@values){
            chomp $value;
            $value = ($value/$max) * 4095;
            my  $first = floor($value / 64);
            my  $second = $value % 64;
            $encoding .= $characters[$first] . $characters[$second];
            }
        $returnstring .= $encoding.',';
        }
    return substr($returnstring,0,-1);
}

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In reply to Perl and Google Charts extended encoding by PoliceCoP

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