#!/usr/bin/perl
#

$JDBASE = 2455000;

$date = "2014 Jun 20";
$target = "_asascl14";
$filter = "clear";
$filter_lc = lc($filter);
$mag_offset = 0.0;
$aper = "3";
$suffix = sprintf "_%s.dat%s", $filter_lc, $aper;

# make the Postscript graph
make_graph($target . "_" . $aper . "" . $filter . "_closeup_jan20.ps", "postscript color enhanced 'Helvectica,18' ");

# make a PNG graph
#make_graph("hs2331_" . $aper . "_jul23.png", "png color");

exit 0;



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

  # get the arguments
  $output_file = $_[0];
  $term_options = $_[1];
  $nice_target = $target;
  $nice_target =~ s/^_//;

  $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 key top right \n";
  printf CMDFILE "set xlabel 'Julian Date - $JDBASE' \n";
  printf CMDFILE "set title '$nice_target field, $filter $aper-pix diff mag, 12-inch, $date UT'\n", $aper;
  
  $cmd = "plot [1828.63:1828.76][0.35:-0.05] 'starA$suffix' using (\$5-$JDBASE):((0.05)+\$7-$mag_offset)   lt 1 pt 1 lw 4 t 'shifted A'";
  $cmd = $cmd . ", 'starASAS$suffix' using (\$5-$JDBASE):(\$7-$mag_offset) lt 2 ps 0.8 pt 2 lw 4 t 'ASAS' ";
  $cmd .= " , ";
  $cmd .= "    'starB$suffix' using (\$5-$JDBASE):(-0.15+\$7-$mag_offset) ";
  $cmd .= "          lt 1 lc 3  pt 5 lw 3  t 'shifted B' ";

  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`;
  }

}