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#!/usr/bin/env perl
use warnings;
use strict;
use diagnostics;
use PDF::Table;
########################################################
# NOTE: latest version of PDF::API2 (2.043) seems to
# have some incompatible font changes, resulting in
# $min_width being twice what it is in PDF::Builder, and
# resulting in the chessboard being far too big. This
# is being investigated.
########################################################
#my $mode = 'text'; # use letters from Helvetica
my $mode = 'graphics'; # use Unicode chess glyphs from DejaVu-Sans
#my $mode = 'images'; # TBD use of images
# Demonstrate a chessboard using even and odd row bg and fg color definitions
# on a per-column ($column_props) basis.
# Gray bg shows move of White Knight to catpure Black King's Bishop (both red),
# with $cell_props.
# Once images are supported, will change to pictures of pieces (or maybe both).
# Please use TABSTOP=4 for best view
# -------------
# -A or -B on command line to select preferred library (if available)
# then look for PDFpref file and read A or B forms
my ($PDFpref, $rcA, $rcB); # which is available?
my $prefFile = "./PDFpref";
my $prefDefault = "B"; # PDF::Builder default if no prefFile, or both installed
if (@ARGV) {
# A or -A argument: set PDFpref to A else B
if ($ARGV[0] =~ m/^-?([AB])/i) {
$PDFpref = uc($1);
} else {
print STDERR "Unknown command line flag $ARGV[0] ignored.\n";
}
}
if (!defined $PDFpref) {
if (-f $prefFile && -r $prefFile) {
open my $FH, '<', $prefFile or die "error opening $prefFile: $!\n";
$PDFpref = <$FH>;
if ($PDFpref =~ m/^A/i) {
# something starting with A, assume want PDF::API2
$PDFpref = 'A';
} elsif ($PDFpref =~ m/^B/i) {
# something starting with B, assume want PDF::Builder
$PDFpref = 'B';
} elsif ($PDFpref =~ m/^PDF:{1,2}A/i) {
# something starting with PDF:A or PDF::A, assume want PDF::API2
$PDFpref = 'A';
} elsif ($PDFpref =~ m/^PDF:{1,2}B/i) {
# something starting with PDF:B or PDF::B, assume want PDF::Builder
$PDFpref = 'B';
} else {
print STDERR "Don't see A... or B..., default to $prefDefault\n";
$PDFpref = $prefDefault;
}
close $FH;
} else {
# no preference expressed, default to PDF::Builder
print STDERR "No preference file found, so default to $prefDefault\n";
$PDFpref = $prefDefault;
}
}
foreach (1 .. 2) {
if ($PDFpref eq 'A') { # A(PI2) preferred
$rcA = eval {
require PDF::API2;
1;
};
if (!defined $rcA) { $rcA = 0; } # else is 1;
if ($rcA) { $rcB = 0; last; }
$PDFpref = 'B';
}
if ($PDFpref eq 'B') { # B(uilder) preferred
$rcB = eval {
require PDF::Builder;
1;
};
if (!defined $rcB) { $rcB = 0; } # else is 1;
if ($rcB) { $rcA = 0; last; }
$PDFpref = 'A';
}
}
if (!$rcA && !$rcB) {
die "Neither PDF::API2 nor PDF::Builder is installed!\n";
}
# -------------
our $VERSION = '1.003'; # VERSION
our $LAST_UPDATE = '1.000'; # manually update whenever code is changed
my $outfile = $0;
if ($outfile =~ m#[\\/]([^\\/]+)$#) { $outfile = $1; }
$outfile =~ s/\.pl$/.pdf/;
my $pdftable = PDF::Table->new();
# -------------
my $pdf;
if ($rcA) {
print STDERR "Using PDF::API2 library\n";
$pdf = PDF::API2->new( -file => $outfile );
} else {
print STDERR "Using PDF::Builder library\n";
$pdf = PDF::Builder->new( -file => $outfile );
}
# -------------
my $page = $pdf->page();
$pdf->mediabox('A4');
# A4 as defined by PDF::API2 is h=842 w=545 for portrait
# some data to lay out. notice that there are 8 rows of 8 columns
my $chessboard;
if ($mode eq 'text') {
$chessboard = [
# rows TTB, LTR value=piece name, or blank for empty
# unfortunately, none of the corefonts include chess pieces
[ 'WKB', ' ', ' ', ' ', ' ', ' ', 'WK', 'WKR' ],
[ ' ', ' ', ' ', ' ', ' ', ' ', ' ', 'BR' ],
[ ' ', ' ', 'WR', ' ', ' ', ' ', ' ', ' ' ],
[ ' ', ' ', 'BKB', ' ', 'Bp', ' ', 'Bp', ' ' ],
[ 'WN', ' ', 'Wp', ' ', 'BK', ' ', 'Wp', ' ' ],
[ ' ', 'Bp', ' ', ' ', 'Wp', ' ', ' ', 'Bp' ],
[ ' ', 'Wp', ' ', ' ', 'Wp', ' ', ' ', 'Wp' ],
[ ' ', ' ', ' ', ' ', ' ', 'WN', ' ', ' ' ],
];
} else {
$chessboard = [
# rows TTB, LTR value=piece name, or blank for empty
[ "\x{2657}", ' ', ' ', ' ', ' ', ' ', "\x{2654}", "\x{2656}" ],
[ ' ', ' ', ' ', ' ', ' ', ' ', ' ', "\x{265C}" ],
[ ' ', ' ', "\x{2656}", ' ', ' ', ' ', ' ', ' ' ],
[ ' ', ' ', "\x{265D}", ' ', "\x{265F}", ' ', "\x{265F}", ' ' ],
[ "\x{2658}", ' ', "\x{2659}", ' ', "\x{265A}", ' ', "\x{2659}", ' ' ],
[ ' ', "\x{265F}", ' ', ' ', "\x{2659}", ' ', ' ', "\x{265F}" ],
[ ' ', "\x{2659}", ' ', ' ', "\x{2659}", ' ', ' ', "\x{2659}" ],
[ ' ', ' ', ' ', ' ', ' ', "\x{2658}", ' ', ' ' ],
];
}
# what's the longest string (widest text) we'll use?
my ($font, $font_size, $min_width);
if ($mode eq 'text') {
$font = $pdf->corefont('Helvetica');
$font_size = 15;
} else {
$font = $pdf->ttfont('/Windows/Fonts/dejavusans.ttf');
$font_size = 30;
}
my $text = $page->text();
$text->font($font, $font_size);
if ($mode eq 'text') {
$min_width = $text->advancewidth('WKR');
} else {
$min_width = 1.7*$text->advancewidth($chessboard->[0][0]);
# TEMP
$min_width /= 2 if $PDFpref eq 'A';
}
$min_width += 2 * 2; # L + R padding
# build the table layout
$pdftable->table(
# required params
$pdf,
$page,
$chessboard,
x => 20,
w => 8 * $min_width,
y => 700,
h => 8 * $min_width + 1, # if +0, last row to next page!
# some optional params
padding => 2,
padding_top => # center vertically in cell, trial & error
($mode eq 'text')? 10.4: 6.4,
justify => "center",
font => $font,
font_size => $font_size,
min_w => $min_width,
max_w => $min_width,
min_rh => $min_width,
# unfortunately, the chess pieces (graphics) are designed for
# black on white, and black fg disappears against black bg.
# however BonW and WonB make it hard to tell B and W pieces!
column_props => [
{bg_color_odd => 'black', fg_color_odd => 'white', # col 0
bg_color_even => 'white', fg_color_even => 'black' },
{bg_color_odd => 'white', fg_color_odd => 'black', # col 1
bg_color_even => 'black', fg_color_even => 'white' },
{bg_color_odd => 'black', fg_color_odd => 'white', # col 2
bg_color_even => 'white', fg_color_even => 'black' },
{bg_color_odd => 'white', fg_color_odd => 'black', # col 3
bg_color_even => 'black', fg_color_even => 'white' },
{bg_color_odd => 'black', fg_color_odd => 'white', # col 4
bg_color_even => 'white', fg_color_even => 'black' },
{bg_color_odd => 'white', fg_color_odd => 'black', # col 5
bg_color_even => 'black', fg_color_even => 'white' },
{bg_color_odd => 'black', fg_color_odd => 'white', # col 6
bg_color_even => 'white', fg_color_even => 'black' },
{bg_color_odd => 'white', fg_color_odd => 'black', # col 7
bg_color_even => 'black', fg_color_even => 'white' },
],
cell_props => [
[],[],[], # rows 0-2, no cell overrides
# red fg looks good for text, but bad for symbols
# anyone who knows chess will figure out it's NxB
[ # row 3 col 2 gray bg, red fg
{}, {},
{ bg_color => '#888888' }
],
[ # row 4 cols 0-2 gray bg, red fg for col 0
{ bg_color => '#888888' },
{ bg_color => '#888888' },
{ bg_color => '#888888' },
],
],
);
$pdf->save();
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