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#======================================================================= |
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# |
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# PDF::Builder::Matrix |
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# Original Copyright 1995-96 Ulrich Pfeifer. |
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# modified by Alfred Reibenschuh for PDF::API2 |
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# rewritten by Steve Simms and licensed under the same |
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# terms as the rest of PDF::API2 |
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# |
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#======================================================================= |
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package PDF::Builder::Matrix; |
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use strict; |
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1040
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use warnings; |
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use Carp; |
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our $VERSION = '3.023'; # VERSION |
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our $LAST_UPDATE = '3.020'; # manually update whenever code is changed |
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=head1 NAME |
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PDF::Builder::Matrix - matrix operations library |
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=cut |
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sub new { |
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my $type = shift(); |
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my $self = []; |
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my $col_count = scalar(@{$_[0]}); |
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foreach my $row (@_) { |
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unless (scalar(@$row) == $col_count) { |
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carp 'Inconsistent column count in matrix'; |
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return; |
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} |
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push(@{$self}, [@$row]); |
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} |
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return bless($self, $type); |
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} |
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# internal routine |
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sub transpose { |
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my $self = shift(); |
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my @result; |
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my $m; |
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for my $col (@{$self->[0]}) { |
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push @result, []; |
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} |
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for my $row (@$self) { |
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$m = 0; |
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for my $col (@$row) { |
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push @{$result[$m++]}, $col; |
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} |
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} |
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return PDF::Builder::Matrix->new(@result); |
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} |
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# internal routine |
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sub vector_product { |
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0
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my ($a, $b) = @_; |
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my $result = 0; |
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for my $i (0 .. $#{$a}) { |
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$result += $a->[$i] * $b->[$i]; |
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} |
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return $result; |
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} |
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# used by Content.pm |
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sub multiply { |
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0
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my $self = shift(); |
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my $other = shift->transpose(); |
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my @result; |
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unless ($#{$self->[0]} == $#{$other->[0]}) { |
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81
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0
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carp 'Mismatched dimensions in matrix multiplication'; |
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return; |
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} |
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for my $row (@$self) { |
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my $result_col = []; |
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for my $col (@$other) { |
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push @$result_col, vector_product($row,$col); |
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} |
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push @result, $result_col; |
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} |
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return PDF::Builder::Matrix->new(@result); |
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} |
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1; |