Thanks to help from here, I've finally got most of my tag cloud working as I want it to. I've been trying to use a log function to make the font sizes readable but I've come a little awry on it. I'm trying to set up the values for $maxTagCnt and $minTagCnt to run the log against later in DetermineFontSize but I've not been able to initialize the value correctly and would value some help in achieving this: 
use strict;
use warnings;

use DBI;

my $dbh = DBI->connect('dbi:mysql:milton:localhost', 'user', 'pword');
my $sth = $dbh->prepare ('SELECT word, occurrences FROM statistic ORDE
+R BY occurrences DESC LIMIT 200');

my %tag;
my ($word, $count);
#load in tag file - do this from db
$sth->execute;
while (my($word, $count) = $sth->fetchrow_array) {
    $tag{$word} = $count;
}
$sth->finish;
$dbh->disconnect();


my $useLogCurve = 1;
my $minFontSize = 10;
my $maxFontSize = 36;
my $fontRange = $maxFontSize - $minFontSize;

#determining the count
my $maxTagCnt = 0;
my $minTagCnt = 1000000;

foreach $word (%tag) {
   $maxTagCnt = $tag{word} if $tag{word} lt $maxTagCnt;
   $minTagCnt = $tag{word} if $tag{word} gt $minTagCnt;
}

my $minLog = log($minTagCnt);
my $maxLog = log($maxTagCnt);
my $logRange = $maxLog - $minLog;
$logRange = 1 if ($maxLog == $minLog);

sub DetermineFontSize ($) {
  my ($tagCnt) = @_;
  my $cntRatio;
  if ($useLogCurve) {
      $cntRatio = (log($tagCnt) - $minLog)/$logRange;
  }
    my $fsize = $minFontSize + $fontRange * $cntRatio;
  return $fsize;
}

#output tag cloud
print "Content-type: text/html\n";
print<<EOT;

  <html>
  <head>
  <link href="../../css/tagcloud.css" rel="stylesheet" type="text/css"
+>
  </head>
  <body>
  <div class=\"cdiv\">
  <p class=\"cbox\">
EOT
#output the keys
#still needs to have on onclick event to get the bigrams or to search
foreach $word (sort keys  %tag) {
  my $fsize = DetermineFontSize($tag{$word});
  printf "<div name=\"$word\" style=\"font-size:%dpx;\">%s", $fsize, $
+word, "</div>";
}
  
#output end of tag file
print <<EOT;
  </p>
  </div>
  </body>
  </html>
EOT
__END__

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In reply to Setting up a log to determine font size by Quicksilver

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