Good day monks I have been working with doing a bandwidth test that prints out html for a few days now and with the help of a fellow monk I was able to get a working test to run, but I am now wanting to get the thing to use GD::Graph to make a pretty image..
I have read the perldoc on GD::Graph and think I have it right but I am getting this error "can't call method "plot" on an undefined value". Now from what I can see there should be no issue, but I must be missing something. Below is my code for you to look over and let me know if I am just missing something.
#!/usr/bin/perl -w
use warnings;
use strict;
use Time::HiRes qw ( gettimeofday ) ;
use CGI qw(:standard);
use GD::Graph::hbars;
use CGI::Carp (fatalsToBrowser);
my $data = "E"x1020; #start with using 1k blocks shall we?
my %cgi_vars;
foreach my $pair ( split ( "&", $ENV{'QUERY_STRING'} ) ) {
my ( $var, $val ) = split ("=", $pair);
$cgi_vars{$var} = $val;
}
#cgi headers:
print "content-type: text/html\n\n";
#take time
my ( $start_seconds, $start_microseconds ) = gettimeofday;
print "Start Seconds:$start_seconds Start MicroSeconds:$start_microsec
+onds<BR/>\n";
#print stuff to thingy
if ( $cgi_vars{"data_size"} ) {
for ( my $count=0; $count < $cgi_vars{"data_size"}; $count++ ) {
print "<!",$data,"->\n";
}
}
#take time
my ( $end_seconds, $end_microseconds ) = gettimeofday;
print "End Seconds:$end_seconds End MicroSeconds:$end_microseconds<
+BR/>\n";
#compare
my $time_delta = ($end_seconds - $start_seconds) + ( ( $end_microsecon
+ds - $start_microseconds) / 1000000);
if ( $cgi_vars{"data_size"} ) {
print "your data transfer of ", $cgi_vars{"data_size"}, "k took ", $
+time_delta, " seconds<BR/>\n";
print "your bandwidth is ",$cgi_vars{"data_size"} / $time_delta ," k
+ilobytes/sec<BR/>\n";
my @data = "$time_delta";
my $graph = GD::Graph::hbars->new(400, 300);
$graph->set(
x_label => 'Transfer Data',
y_label => 'Some Label',
title => 'Adelphia Speed Test'
);
my $gd = my $my_graph->plot(\@data);
open(IMG, '>../htdocs/graph.png') or die $!;
binmode IMG;
print IMG $gd->png;
close IMG;
}
else {
print "please invoke as $ENV{'SCRIPT_NAME'}?data_size=100<BR/> \n";
}
exit;
Thanks in advanced for all your help!!
-Stephen