#!/usr/bin/perl
#

  
  my($output_file, $term_options);

  # get the arguments
  $output_file = "plot_trans_a.ps";
  $term_options = "postscript color enhanced 'Helvetica,18' ";

  $cmdfile = "gnuplot.in";
  
  open (CMDFILE, ">$cmdfile") || die("can't open $cmdfile for writing");
  printf CMDFILE "set output '$output_file' \n";
  printf CMDFILE "set term $term_options \n";

  #  revert to some oldish default colors 
  printf CMDFILE "set style line 1 lt rgb 'red' lw 3  \n"; 
  printf CMDFILE "set style line 2 lt rgb 'sea-green' lw 3  \n"; 
  printf CMDFILE "set style line 3 lt rgb 'blue' lw 3  \n"; 
  printf CMDFILE "set style line 4 lt rgb 'cyan' lw 3  \n"; 
  printf CMDFILE "set style line 5 lt rgb 'violet' lw 3  \n"; 




  printf CMDFILE "set grid \n";
  printf CMDFILE "set key top left \n";
  printf CMDFILE "set ylabel 'Transmission' \n";
  printf CMDFILE "set xlabel 'Wavelength (Angstroms)' \n";
  printf CMDFILE "set arrow 1 heads from 400,0.3 to 800,0.3 \n";
  printf CMDFILE "set label 1 at 500, 0.25 'range of human vision'  \n";
  printf CMDFILE "set label 2 textcolor rgb 'blue' at 450, 0.15 'blue'  \n";
  printf CMDFILE "set label 3 textcolor rgb 'green' at 550, 0.15 'green'  \n";
  printf CMDFILE "set label 4 textcolor rgb 'red' at 700, 0.15 'red'  \n";


  printf CMDFILE "set title 'Transmission of the atmosphere of the Earth' \n";
  
  $cmd = "plot [200:1000][] '../modtran_maunakea.txt' using (\$1*1000):2 ";
  $cmd .= "   with lines ls 1  t '' ";

  printf CMDFILE "$cmd \n";
  printf CMDFILE "set output \n";
  printf CMDFILE "quit \n";
  close(CMDFILE) ;
  
  $retval = `gnuplot < $cmdfile`;
  printf "retval is ..%s..\n", $retval;
  
  if ($term_options =~ /postscript/) {
    $psfile = $output_file;
    $giffile = $psfile;
    $giffile =~ s/.ps/.png/;
    $cmd = "convert -rotate 90 $psfile $giffile";
    printf "cmd is ..$cmd.. \n";
    $ret = `$cmd`;
  }



exit 0;
