#!/usr/bin/perl
#

  my($output_file, $term_options);

  ######################################################################
  #  Plot two distributions of the "x2" distance (base of table to 
  #     landing spot), based on two types of calculation.
  #
  #        a) assigning gaussian random values to each input
  #        b) using propagation of errors
  #
  $output_file = "compare_proj_dist_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 right \n";
  printf CMDFILE "set ylabel 'Number of instances' \n";
  printf CMDFILE "set xlabel 'Value of distance x2 (cm) ' \n";
  printf CMDFILE "set title 'Projectile shots for one set of input values '\n";

  $mean = 195.5;
  $stdev = 15.69;
  
  $cmd = "plot [140:250][0:700] 'foo.hist' using 1:2 with boxes ";
  $cmd = $cmd . "   ls 1 t 'gaussian sims ' ";
  $cmd = $cmd . " , ";
  $cmd = $cmd . "   630*exp(-(x-$mean)*(x-$mean)/(2.0*$stdev*$stdev)) ";
  $cmd = $cmd . "   ls 2 t 'propagation' ";

  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 -flatten -background white -rotate 90 $psfile $giffile";
    printf "cmd is ..$cmd.. \n";
    $ret = `$cmd`;
  }


exit 0;