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#=======================================================================
#
# PDF::Builder::Matrix
# Original Copyright 1995-96 Ulrich Pfeifer.
# modified by Alfred Reibenschuh <areibens@cpan.org> for PDF::API2
# rewritten by Steve Simms <steve@deefs.net> and licensed under the same
# terms as the rest of PDF::API2
#
#=======================================================================
package PDF::Builder::Matrix;
use strict;
use warnings;
use Carp;
our $VERSION = '3.028'; # VERSION
our $LAST_UPDATE = '3.027'; # manually update whenever code is changed
=head1 NAME
PDF::Builder::Matrix - Matrix operations library
=cut
sub new {
my $type = shift();
my $self = [];
my $col_count = scalar(@{$_[0]});
foreach my $row (@_) {
unless (scalar(@$row) == $col_count) {
carp 'Inconsistent column count in matrix';
return;
}
push(@{$self}, [@$row]);
}
return bless($self, $type);
}
# internal routine
sub transpose {
my $self = shift();
my @result;
my $m;
for my $col (@{$self->[0]}) {
push @result, [];
}
for my $row (@$self) {
$m = 0;
for my $col (@$row) {
push @{$result[$m++]}, $col;
}
}
return PDF::Builder::Matrix->new(@result);
}
# internal routine
sub vector_product {
my ($a, $b) = @_;
my $result = 0;
for my $i (0 .. $#{$a}) {
$result += $a->[$i] * $b->[$i];
}
return $result;
}
# used by Content.pm
sub multiply {
my $self = shift();
my $other = shift->transpose();
my @result;
unless ($#{$self->[0]} == $#{$other->[0]}) {
carp 'Mismatched dimensions in matrix multiplication';
return;
}
for my $row (@$self) {
my $result_col = [];
for my $col (@$other) {
push @$result_col, vector_product($row,$col);
}
push @result, $result_col;
}
return PDF::Builder::Matrix->new(@result);
}
1;
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