#!/usr/bin/perl
#
#

##########################################
#  plot position vs. time for
#      an under-damped example
#     
  
  my($output_file, $term_options);

  # get the arguments
  $output_file = "under_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 xzeroaxis  lw 3.5 \n";
  printf CMDFILE "set yzeroaxis  lw 3.5 \n";
  printf CMDFILE "set ylabel 'Position (m)'  \n";
  printf CMDFILE "set xlabel 'Time (s)' \n";
  printf CMDFILE "set title 'm = 2.0 kg, k = 32.0 N/m, b = 8 kg/s ' \n";
#  printf CMDFILE "set label  '{/Symbol w_0} ' at 8.8,-0.5 \n";

  $cmd = "plot [-0.2:2.5][-2.5:6.0] './make_badunder_data.out' index 0 using 2:4 ";
  $cmd .= "        with lines ls 1 lw 3 t 'pos' ";
  printf CMDFILE "$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`;
  }



##########################################
#  plot position AND velocity vs. time for
#      a critically damped example
#      which DOESN'T satisfy some initial conditions
  
  my($output_file, $term_options);

  # get the arguments
  $output_file = "under_plot_b.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 xzeroaxis  lw 3.5 \n";
  printf CMDFILE "set yzeroaxis  lw 3.5 \n";
  printf CMDFILE "set ylabel 'Position (m) or Velocity (m/s)'  \n";
  printf CMDFILE "set xlabel 'Time (s)' \n";
  printf CMDFILE "set title 'm = 2.0 kg, k = 32.0 N/m, b = 8 kg/s ' \n";
#  printf CMDFILE "set label  '{/Symbol w_0} ' at 8.8,-0.5 \n";

  $cmd = "plot [-0.2:2.5][-20:10.0] './make_badunder_data.out' index 0 using 2:4 ";
  $cmd .= "        with lines ls 1 lw 3 t 'pos' ";
  $cmd .= " , ";
  $cmd .= "                        './make_badunder_data.out' index 0 using 2:10 ";
  $cmd .= "        with lines ls 3 lw 3 t 'vel' ";

  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`;
  }




##########################################
#  plot position AND velocity vs. time for
#      an under-damped example
#      which DOES work
  
  my($output_file, $term_options);

  # get the arguments
  $output_file = "under_plot_c.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 xzeroaxis  lw 3.5 \n";
  printf CMDFILE "set yzeroaxis  lw 3.5 \n";
  printf CMDFILE "set ylabel 'Position (m) or Velocity (m/s)'  \n";
  printf CMDFILE "set xlabel 'Time (s)' \n";
  printf CMDFILE "set title 'm = 2.0 kg, k = 32.0 N/m, b = 8 kg/s ' \n";
#  printf CMDFILE "set label  '{/Symbol w_0} ' at 8.8,-0.5 \n";

  $cmd = "plot [-0.2:2][-15:10.0] './make_under_data.out' index 0 using 2:4 ";
  $cmd .= "        with lines ls 1 lw 3 t 'pos' ";
  $cmd .= " , ";
  $cmd .= "                        './make_under_data.out' index 0 using 2:10 ";
  $cmd .= "        with lines ls 3 lw 3 t 'vel' ";

  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;
