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# /=====================================================================\ #
# | LaTeXML::Core::MuDimension | #
# | Representation of Math Dimensions | #
# |=====================================================================| #
# | Part of LaTeXML: | #
# | Public domain software, produced as part of work done by the | #
# | United States Government & not subject to copyright in the US. | #
# |---------------------------------------------------------------------| #
# | Bruce Miller <bruce.miller@nist.gov> #_# | #
# | http://dlmf.nist.gov/LaTeXML/ (o o) | #
# \=========================================================ooo==U==ooo=/ #
package LaTeXML::Core::MuDimension;
use LaTeXML::Global;
use strict;
use warnings;
use LaTeXML::Common::Number;
use LaTeXML::Common::Dimension;
use base qw(LaTeXML::Common::Dimension);
use base qw(Exporter);
our @EXPORT = (qw(&MuDimension));
#======================================================================
# Exported constructor.
# Note that MuDimension is almost never used in TeX (there's no \newmudimen)
# Create a MuDimension given either a float with "mu" OR a number in scaled mu (NOT scaled points!)
sub MuDimension {
my ($spec) = @_;
return LaTeXML::Core::MuDimension->new($spec); }
sub _unit { return 'mu'; }
sub new {
my ($class, $spec) = @_;
$spec = "0" unless $spec;
$spec = ToString($spec) if ref $spec;
if ($spec =~ /^(-?\d*\.?\d*)mu$/) { # mu given, convert to scaled mu
return bless [fixpoint($1, $UNITY)], $class; } # fake "mu" in sp
else {
# See comment in Dimension for why kround rather than int
return bless [kround($spec || 0)], $class; } }
#======================================================================
sub stringify {
my ($self) = @_;
return "MuDimension[" . $$self[0] . "]"; }
# Note that $mu->valueOf will return scaled mu, NOT scaled pts;
# But in priniple these should never be combined with regular Dimensions/Glue
# TeX gives error "Incompatible glue units"
# HOWEVER, since we'll encounter mixtures of mu & pts when computing sizes,
# we're going to have to make sure we use the right scaling!
sub spValue {
my ($self, $prec) = @_;
return kround($$self[0] * $STATE->lookupValue('font')->getMUWidth / $UNITY); }
# A mu is 1/18th of an em in the current math font.
# 1 mu = 1em/18 = 10pt/18 = 5/9 pt; 1pt = 9/5mu = 1.8mu (for 10pt)
sub ptValue {
my ($self, $prec) = @_;
return roundto($$self[0] / $UNITY / 1.8, $prec); }
sub pxValue {
my ($self, $prec) = @_;
return roundto($$self[0] / $UNITY / 1.8 * ($STATE->lookupValue('DPI') || 100 / 72.27), $prec); }
#======================================================================
1;
__END__
=pod
=head1 NAME
C<LaTeXML::Core::MuDimension> - representation of math dimensions;
extends L<LaTeXML::Common::Dimension>.
=head2 Exported functions
=over 4
=item C<< $mudimension = MuDimension($spec); >>
Creates a MuDimension object, similar to Dimension.
C<$spec> can be a string with a floating point number and "mu"
or just a number standing for scaled mu (ie. fixedpoint).
=back
=head1 AUTHOR
Bruce Miller <bruce.miller@nist.gov>
=head1 COPYRIGHT
Public domain software, produced as part of work done by the
United States Government & not subject to copyright in the US.
=cut
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