#!/usr/bin/perl
#
# Make plot(s) involving beats
#
# MWR 4/4/2019

$mypi = 3.14159;


$xmin = 0.0;
$xmax = 10.0;
$ymin = -1.2;
$ymax = 7.2;


# make plot showing two input waves, plus the sum

  my($output_file, $term_options);

  $datafile = "./make_beat_data.out";
  $output_file = "./beat_plot_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 '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 right \n";
  printf CMDFILE "set xrange [$xmin:$xmax]  \n";
  printf CMDFILE "set yrange [$ymin:$ymax]  \n";
  # printf CMDFILE "set xlabel 'X position (m)  '  \n";
  # printf CMDFILE "set ylabel 'Y position (m) ' \n";
  #  printf CMDFILE "set title '' \n"; 

  printf CMDFILE "plot '$datafile' using 1:3 with lines ls 1  t ''  ";
  printf CMDFILE " , ";
  printf CMDFILE "     '$datafile' using 1:(\$5+2) with lines ls 2  t ''  ";
  printf CMDFILE " , ";
  printf CMDFILE "     '$datafile' using 1:(\$7+5) with lines ls 3  t ''  ";
  printf CMDFILE "\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;

