#!/usr/bin/perl

=comment
+-------------+--------------------------------------------------------------+
 |  Format     |                Explanation                                   |
 +-------------+--------------------------------------------------------------+
 |    %a       |   abbreviated name of day of the week                        |
 |    %A       |   full name of day of the week                               |
 |    %b or %h |   abbreviated name of the month                              |
 |    %B       |   full name of the month                                     |
 |    %D       |   shorthand for "%m/%d/%y"                                   |
 |    %H or %k |   hour, 0--24                                                |
 |    %I or %l |   hour, 0--12                                                |
 |    %p       |   "am" or "pm"                                               |
 |    %r       |   shorthand for "%I:%M:%S %p"                                |
 |    %R       |   shorthand for %H:%M"                                       |
 |    %T       |   shorthand for "%H:%M:%S"                                   |
 |    %U       |   week of the year (week starts on Sunday)                   |
 |    %w       |   day of the week, 0--6 (Sunday = 0)                         |
 |    %W       |   week of the year (week starts on Monday)                   |
 +-------------+--------------------------------------------------------------+

#to create line breaks in a multi-column file substitute 'x' for missing values

set missing 'x'
plot 'myfile' using 1:($5) t 'mytitle' with lines lt 1

=cut

sub my_graph
{
my ($graph_data_file, $title, $y_units, $dir_path, $time_zone, $size_x, $size_y) = @_;

if (!($size_x)) { $size_x = 600; }
if (!($size_y)) { $size_y = 300; }

$size_x = $size_x*0.001562499;
$size_y = $size_y*0.00205;

if (!($time_zone)) { $time_zone = 'EST'; }
elsif ($time_zone == -4) { $time_zone = 'EDT'; }
elsif ($time_zone == -5) { $time_zone = 'EST'; }

open (SCRIPT,">$graph_data_file.script");

print SCRIPT "
set terminal png
set output \"$dir_path\"
#640x480 default
#set size 0.9375,0.625
set size $size_x,$size_y
set title \"$title\"
set autoscale xy
set data style lines
#set xlabel \"Date/Time (UTC (GMT))\"
#set xlabel \"Time (EST)\" 0,-1 
set xlabel \"Time ($time_zone)\"  
set timefmt \"%m %d %Y %H:%M\"
set xdata time
#set xtics rotate
set ylabel \"$y_units\"
#set format x \"%m/%d\\n%H:%M\"
#set format x \"%b %d %l:%M %p\"
set format x \"%b%d\\n%l%p\"
set grid
#set key right
set nokey
plot '$graph_data_file' using 1:5 with lines lt 1
#show grid
reset
quit";
close SCRIPT;

`gnuplot $graph_data_file.script`;
`rm $graph_data_file.script`;
`rm $graph_data_file`;
}

1;