#!/usr/bin/perl
#


##########################################
#  show a sinusoidal pattern of golf course
  
  my($output_file, $term_options);

  # get the arguments
  $output_file = "empty_plane.ps";
  $term_options = "postscript color enhanced 'Helvetica,18' size 10,10 ";

  $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 '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 bot left \n";
  printf CMDFILE "set size square \n";
  printf CMDFILE "set ylabel 'Real axis '  \n";
  printf CMDFILE "set xlabel 'Imaginary axis ' \n";
  
  $cmd = "plot [-10:10][-10:10] 'empty_plane.dat' using 1:2 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;


