#!/usr/bin/perl

eval 'exec /usr/bin/perl  -S $0 ${1+"$@"}'
    if 0; # not running under some shell
#########################################################################
#        This Perl script is Copyright (c) 2002, Peter J Billam         #
#               c/o P J B Computing, www.pjb.com.au                     #
#                                                                       #
#     This script is free software; you can redistribute it and/or      #
#            modify it under the same terms as Perl itself.             #
#########################################################################

eval "require 'Math/Evol.pm';";
if ($@) { require 'Evol.pm'; }

eval "require 'Term/Clui.pm';";
if ($@) { require 'Clui'; }

my $Version       = '1.13';
my $VersionDate   = '13jun2017';
my $KeepAllSteps  = 0;
my $TmpDir        = "/tmp/ps_evol.$$";
my $Landscape     = 0;
use open ':locale';


while ($ARGV[$[] =~ /^-([a-z])/) {
	if ($1 eq 'v')      { shift;
		my $n = $0; $n =~ s{^.*/([^/]+)$}{$1};
		print "$n version $Version $VersionDate\n";
		exit 0;
	} elsif ($1 eq 'k') { $KeepAllSteps = 1; shift;
	} elsif ($1 eq 'l') { $Landscape    = 1; shift;
	} else {
		print "usage:\n";  my $synopsis = 0;
		while (<DATA>) {
			if (/^=head1 SYNOPSIS/)     { $synopsis = 1; next; }
			if ($synopsis && /^=head1/) { last; }
			if ($synopsis && /\S/)      { s/^\s*/   /; print $_; next; }
		}
		exit 0;
	}
}

$tmpfile = "/tmp/ps_evol_$$.ps";
if ($KeepAllSteps) {
	if (! mkdir $TmpDir) { die "can't mkdir $TmpDir: $!\n"; }
	if (! chdir $TmpDir) { die "can't chdir $TmpDir: $!\n"; }
}

my @PATH = split (":",$ENV{PATH});
sub which { my $f; foreach $d (@PATH) {$f="$d/$_[0]";  return $f if -x $f; }}

sub choose_best_text {
	if (! open (T, "> $tmpfile")) { die "can't open $tmpfile: $!\n"; }
	print T @prolog;
	# 1.13 the -l = Landscape option should display 2x4 rather than 3x3
	print T <<EOT;
(Helvetica-Bold) findfont 14 scalefont setfont

% HERE BEGINS YOUR LATEST BEST CHOICE
gsave 207 289 translate 5 5 moveto (5) show 0.30 dup scale
$_[0]
% HERE  ENDS  YOUR LATEST BEST CHOICE

grestore gsave  20 550 translate 5 5 moveto (1) show 0.30 dup scale
$_[1]
grestore gsave 207 550 translate 5 5 moveto (2) show 0.30 dup scale
$_[2]
grestore gsave 394 550 translate 5 5 moveto (3) show 0.30 dup scale
$_[3]
grestore gsave  20 285 translate 5 5 moveto (4) show 0.30 dup scale
$_[4]
grestore gsave 394 285 translate 5 5 moveto (6) show 0.30 dup scale
$_[5]
grestore gsave  20  20 translate 5 5 moveto (7) show 0.30 dup scale
$_[6]
grestore gsave 207  20 translate 5 5 moveto (8) show 0.30 dup scale
$_[7]
grestore gsave 394  20 translate 5 5 moveto (9) show 0.30 dup scale
$_[8]
grestore showpage
%%EOF
EOT
	close T;
	system "pkill -HUP gv";
	Term::Clui::set_default('Now which drawing do you prefer ?', '5');
	my $preference = Term::Clui::choose(
	  'Now which drawing do you prefer ?',
	  '1','2','3','4','5','6','7','8','9');  # if -l, should offer 1..8
	$continue = 1 ; if (!$preference) { $continue = undef; }
	if ($preference eq '5') { $preference = 0;
	} elsif ((0+$preference) > 5) { $preference = -1 + $preference;
	} else { $preference = 0 + $preference;
	}
	return ($preference, $continue);
}

while (<>) { push @prolog, $_; if (/EndProlog/) { last; } }
while (<>) { push @prolog, $_; if (/EndPageSetup/) { last; } }
while (<>) { if (/showpage/)  { last; } push @page, $_; }
Term::Clui::inform ("Use GhostView or equivalent to view $tmpfile");
my $new_page = Math::Evol::text_evol(join ('', @page), \&choose_best_text, 8);
if (! open (T, "> $tmpfile")) { die "can't open $tmpfile: $!\n"; }
print T join('', @prolog), $new_page, "showpage\n%%EOF\n";
close T;
system "pkill -HUP gv";
Term::Clui::inform ("$tmpfile now contains your evolved version");
exit 0;

__END__

=pod

=head1 NAME

ps_evol - Perl script to fine-tune A4 PostScript drawings

=head1 SYNOPSIS

 vi plant.ps
 # add comments like:    % evol step 0.05 min 0.0 max 1.0
 ps_evol plant.ps > p2.ps
 ps_evol -k plant.ps > p2.ps   # Keep the intermediate steps
 ps_evol -v        # print the version
 perldoc ps_evol   # read the manual :-)

=head1 DESCRIPTION

I<ps_evol> was mainly intended as a demo script
illustrating the I<text_evol> funtion in Math::Evol.pm.
It assumes you have something like GhostView
which allows you to view PostScript files.

It creates a temporary PostScript file,
then repeatedly generates eight variants of the original file,
scales them smaller, numbers them, and displays them in a 3x3 array.
The original is in the middle, as number 5.
It asks the user which variant they prefer,
then uses that as the original for the next iteration.
When the user decides to call a halt,
the latest preferred variant is written to the standard output.

The parameters to be varied in the PostScript file
must be marked out by special comments, such as

 /gray_sky .87 def % evol step 0.05 min 0.0 max 1.0

See I<perldoc Math::Evol> for more details,
and as an example the PostScript file I<plant.ps>,
included with the distribution.

=head1 OPTIONS

=over 3

=item I<-k>

B<K>eeps the intermediate steps of the evolution;
they will be named like the source file but with an added number,
like plant_001.ps plant_002.ps and so on.
This can be useful if you want to make a movie of the evolution process,
such as with:

 vi plant.eps
 # it should start with:  %%BoundingBox 0 0 1280 720
 ps_evol -k plant.eps
 for i in plant_*.eps   # you have enough disc, I hope ?
 do
     o=`echo $i | sed 's/eps$/jpg/'`
     gs -sDEVICE=jpeg -sOutputFile=$o -q -g1280x720 $i
 done
 # mencoder insists on consecutive numbers, so if you want to
 # delete one, you have to renumber all the subsequent files :-(
 mencoder -audiofile plantmusic.wav -oac pcm -fps 24 -ofps 24 \
   'mf://plant_*.jpg' -mf h=1280:w=720:fps=24:type=jpeg \
   -o plant.avi -ovc lavc -lavcopts vcodec=mpeg4:aspect=1.7778
 mplayer plant.avi

=item I<-v>

Prints B<V>ersion number.

=back

=head1 DEPENDENCIES

Uses the CPAN module Term::Clui.pm to dialogue with the user.

=head1 AUTHOR

Peter J Billam, www.pjb.com.au/comp/contact.html

=head1 CREDITS

Based on Math::Evol.pm, and conceptually on
Richard Dawkin's I<Blind Watchmaker> software.

=head1 SEE ALSO

Math::Evol.pm, Term::Clui.pm, http://www.pjb.com.au/, perl(1).

=cut