#!/usr/bin/perl
#


$filter = "V";
$filter_lc = lc($filter);
$mag_offset =  0.0;
$aper = "";
$suffix = sprintf "dat%s%s", $filter_lc, $aper;


############################################################################
# create a file with GNUPLOT commands, then execute GNUPLOT to read
#   from that file.
#
# usage:  make_graph   outfile_file_name  set_term_options
#
  
  my($output_file, $term_options);


  # get the arguments
  $output_file = "landolt_stars.ps";
  $term_options = "postscript mono";

  $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";
  printf CMDFILE "set grid \n";
  printf CMDFILE "set nokey \n";
  printf CMDFILE "set xlabel 'Right Ascension (degrees) ' \n";
  printf CMDFILE "set ylabel 'Declination (degrees) ' \n";
  printf CMDFILE "set title 'Landolt equatorial standard stars (AJ 88, 439, 1983) '\n";
  
  $cmd = "plot [-10:370][-30:30] './landolt.dat' using 2:3 ";
  $cmd = $cmd . "   lw 3 pt 3 ps 0.5 ";

  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`;
  }

