### ======================================================================
### use
### ======================================================================

# --- Perl Core -------------------
use strict;
use warnings;
use Data::Dumper;

# --- Extension -------------------
use List::Util qw(min max sum);
use POSIX      qw(ceil);
use Win32;

# --- GRAPHICS --------------------
use GD;
use GD::Graph::hbars;
use GD::Graph::lines;
use GD::Graph::points;
use GD::Graph::linespoints;



### ======================================================================
### BUILD your data struct and plot options, then call plot
### ======================================================================

         ### ----------------------------------------------------------
         ### build plot @data)
         @data = ([], []);     
           foreach <your values> {            
            push @{$data[0]}, <your X>;
            push @{$data[1]}, <your Y>;
         } 
         # print Dumper(\@data);
            

         ### ----------------------------------------------------------
         ### Plot 
         my $s   = sum(@{$data[1]});      # Sum all data pts.
         my $max = max(@{$data[1]});      # Max val. data pt.
         my ($ymax, $yticks) = scale($max,100);
         my %opt = (
            title           => "<your title>",
            x_label         => "<your X-label>",
            y_label         => "<your Y-label>',
            y_max_value     => $ymax,     
            y_tick_number   => $yticks, 
            y_number_format => "%3d",
            show_values     => 1,
         );
         
         $opt{y_max_value}   = $max + 100;          # Fixed
         $opt{y_tick_number} = 10;
         plot(\%opt, \@data, 'hb');
         
         $opt{title} .= '-';
         $opt{y_max_value}   = $ymax;               # Float
         $opt{y_tick_number} = $yticks;
         plot(\%opt, \@data, 'hb');
          

### ======================================================================
### UTIL: scale
### ======================================================================
sub scale {
   my ($max, $delta) = @_;
   $delta ||= $max * 0.1;

   $max = ceil(($max + $delta) / 10) * 10;
   my $ticks = min (ceil($max+$delta), 10);

   return ($max, $ticks);
}


### ======================================================================
### UTIL: plot (using GD::Graph::$type)
### ======================================================================
sub plot {
    
   ### Set options for graph, cf params and defaulta
   my ($rOpt, $rData, $type, $x, $y) = @_;     # %Opt, @data, ...
   $type ||= 'hb';                             # Default horiz. bars
   $x ||= max(scalar(@{$rData->[1]})*20, 150); # Scale to num. data.pts
   $y ||= 400;                                 # Fixed (dyn: max(ceil($s/2), 400);)
     
   my @opt = %{$rOpt};                         # Flatten option hash to array
   my $graph;                                  # (width:y, height:x)
   if ($type eq 'pt') { $graph = GD::Graph::points->new($y, $x); }
   if ($type eq 'lp') { $graph = GD::Graph::linespoints->new($y, $x); }
   if ($type eq 'hb') { $graph = GD::Graph::hbars->new($y, $x); }
   $graph->set_x_axis_font(gdTinyFont);
   # $graph->set(logo           => ".\\KMD.gif",
   #            logo_resize     => 0.5,
   #            logo_position   => "LL",    );
   $graph->set(@opt) or die $graph->error;
    
    
   ### Plot graph, cf @$rData array
   # print "Plot: ", Dumper(\$rData);
   my $gd = $graph->plot($rData) or die $graph->error;
   
   my ($cwd, $tgt);
   $cwd = Win32::GetCwd();
   foreach my $dir ("plot", "plot\\$PID") {
      $tgt = "$cwd\\$dir";
      unless (-e $tgt and -d $tgt) { mkdir($tgt) or die "can't mkdir '$tgt': $!"; }

   }
   open(IMG, ">$tgt\\$rOpt->{title}.png") or die "can't open $tgt\\$t.png: $!";
   binmode IMG;
   print IMG $gd->png;
}