Heres what I got so far. I used the code linked to me (I hope I got it right). I still cant get rid of the prior image. 
#!/usr/bin/perl -w
use strict;
use Gtk2 '-init';
use Glib qw/TRUE FALSE/;
use GD::Graph::Data;
use GD::Graph::lines;

my $met_data1;
my $met_image1;
my $met_graph1;
my @utc;
my @temp;
my $pixbuf_orig;
my $pixbuf;

my $vp = Gtk2::Viewport->new(undef,undef);

my $utc = 00;
my $temp = 25.4;
my $pres = 1019.3;
my $rh1 = 20.0;
my $rh2 = 20.4;

my $timer_graph = Glib::Timeout->add(5000, \&graph);

&data_build;
Gtk2->main;

sub data_build {
    my $data_window = Gtk2::Window->new('toplevel');
    $data_window->signal_connect(delete_event=> sub{Gtk2->main_quit});
    $data_window->set_title('Sonde Data');
    $data_window->set_position('center');
    $data_window->set_default_size(350,350);
    
    my $data_table = Gtk2::Table->new(6,2,FALSE);
    
    my $utc_label = Gtk2::Label->new("UTC");
    my $utc_entry = Gtk2::Entry->new();
    $utc_entry->set_editable(0);
    
    my $temp_label = Gtk2::Label->new("Temperature");
    my $temp_entry = Gtk2::Entry->new();
    $temp_entry->set_editable(0);
    
    my  $pres_label = Gtk2::Label->new("Pressure");
    my  $pres_entry = Gtk2::Entry->new();
    $pres_entry->set_editable(0);
    
    my  $rh1_label = Gtk2::Label->new("Relative Humidity(1)");
    my  $rh1_entry = Gtk2::Entry->new();
    $rh1_entry->set_editable(0);
    
    my  $rh2_label = Gtk2::Label->new("Relative Humidity(2)");
    my  $rh2_entry = Gtk2::Entry->new();
    $rh2_entry->set_editable(0);
    
    $met_graph1 = GD::Graph::lines->new(350, 200);
    $met_graph1->set( 
        x_label => 'UTC',
        y1_label => 'Celcius',
        y2_label => 'Millibars',
        y1_max_value => 32,
        y1_min_value => 0,
        y2_max_value => 1100,
        y2_min_value => 0,
        y1_tick_number => 14,
        y2_tick_number => 14,
        two_axes => 2,
        line_width => 3,
        transparent => 0,
        dclrs => [ qw(red blue) ],
        x_label_position => 1/2,
    );
    
    # The Data to Start with
    $met_data1 = GD::Graph::Data->new([
        [ 0],
        [ 0],
    #    [ 1100]
    ]) or die GD::Graph::Data->error;
    
    $met_graph1->plot($met_data1);
    my $loader = Gtk2::Gdk::PixbufLoader->new;
    $loader->write ($met_graph1->gd->png);
    $loader->close;
    $pixbuf = $loader->get_pixbuf;
    $pixbuf_orig = $pixbuf->copy();
    $met_image1 = Gtk2::Image->new_from_pixbuf($pixbuf);
    
    $vp->add($met_image1);
    
    $data_table->attach_defaults($utc_label,0,1,0,1);
    $data_table->attach_defaults($utc_entry,1,2,0,1);
    $data_table->attach_defaults($temp_label,0,1,1,2);
    $data_table->attach_defaults($temp_entry,1,2,1,2);
    $data_table->attach_defaults($pres_label,0,1,2,3);
    $data_table->attach_defaults($pres_entry,1,2,2,3);
    $data_table->attach_defaults($rh1_label,0,1,3,4);
    $data_table->attach_defaults($rh1_entry,1,2,3,4);
    $data_table->attach_defaults($rh2_label,0,1,4,5);
    $data_table->attach_defaults($rh2_entry,1,2,4,5);
    $data_table->attach_defaults($vp,0,2,5,6);
   
    $data_window->add($data_table);
    $data_window->show_all;

    return 1;
}


sub graph{
    my $utc_data;
    my $temp_data;
    my $count;
    
    $utc = $utc + 5;
    push(@utc,$utc);
    my $length = @utc;
    shift(@utc) if $length > 10;
    
    $temp = $temp - 0.05;
    push(@temp,$temp);
    $length = @temp;
    shift(@temp) if $length > 10;
    
    my $num = $met_data1->num_points();
    
    if ($met_data1->num_points() == 10) {
        for($count=0;$count<=$num-1;$count++) {
            print "$count $temp[$count]\n";
            $met_data1->set_x($count,$utc[$count]);
            $met_data1->set_y(1,$count,$temp[$count]);
        }
    }else{
        $met_data1->add_point($utc,$temp);
    }
    
    $num = $met_data1->num_points();
    my @values = $met_data1->y_values(1);
    foreach my $kid(@values) {
        print "$num $kid\n";
    }
    
    #$pres = $pres - 3.2;
    #$rh1 = $rh1 - 0.01;
    #$rh2 = $rh2 - 0.012;
    
    $met_graph1->plot($met_data1);
    my $loader = Gtk2::Gdk::PixbufLoader->new;
    $loader->write ($met_graph1->gd->png);
    $loader->close;
    my $pixbuf = $loader->get_pixbuf;
    $pixbuf_orig = $pixbuf->copy();
    $met_image1->set_from_pixbuf ($pixbuf);
    Gtk2->main_iteration while Gtk2->events_pending;
    $pixbuf = $pixbuf_orig->copy();
    
    return 1;
}

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In reply to Re^3: Updating Gtk2::Ex::Graph::GD by deadpickle
in thread Updating Gtk2::Ex::Graph::GD by deadpickle

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