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package Petrophysics::Units; |
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# The following POSC (c) products were used in the creation of this work: |
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# - epsgUnits.xml |
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# - poscUnits.xml |
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# These files can be downloaded from http://www.posc.org. Please see |
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# http://www.posc.org/ebiz/pefxml/patternsobjects.html#units |
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# |
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# Due to the POSC Product License Agreement, these files are not |
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# distributed in their original form. This derivative work converted |
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# those files to perl objects, and added unit conversion functionality |
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# to the objects. |
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# This file is part of the "OSPetro" project. Please see |
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# http://OSPetro.sourceforge.net for further details. |
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# |
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# Copyright (C) 2003 Bjarne Steinsbo |
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# |
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# This library is free software; you can redistribute it and/or modify |
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# it under the same terms as Perl itself. |
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# |
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# The author can be contacted at "steinsbo@users.sourceforge.net" |
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use 5.006; |
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use strict; |
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use warnings; |
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require Exporter; |
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our @ISA = qw(Exporter); |
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# Nothing exported |
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our @EXPORT_OK = (); |
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our @EXPORT = (); |
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our $VERSION = '0.01'; |
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# Read pre-formatted units database to class variable "@objects". |
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our @objects; |
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require 'units_database.inc'; |
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# printf STDERR "%d objects in file\n", scalar @objects; |
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# Make a lookup table by id |
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our %by_id = map { $_->id => $_ } @objects; |
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# And a similar one by short name (annotation) |
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our %by_annotation = map { $_->annotation => $_ } @objects; |
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# Lookup a unit by id |
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sub lookup { |
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my ($class, $id) = @_; |
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return $by_id{$id}; |
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} |
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# Lookup a unit by annotation. Please note that annotation is not |
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# guaranteed to be unique, so the result is an arbitrary unit with the |
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# given annotation |
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sub lookup_annotation { |
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my ($class, $annotation) = @_; |
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return $by_annotation{$annotation}; |
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} |
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# Generic search |
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sub grep { |
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my ($class, $expr) = @_; |
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# Shift to package main namespace |
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package main; |
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no strict 'refs'; |
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return grep (&$expr, @{"${class}::objects"}); |
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} |
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# Return entire list |
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sub all_units { |
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return \@objects; |
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} |
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# Are two units compatible? |
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sub is_compatible { |
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my ($self, $other) = @_; |
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my $b1 = $self->is_base_unit ? $self->id : $self->base_unit->id; |
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my $b2 = $other->is_base_unit ? $other->id : $other->base_unit->id; |
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return $b1 eq $b2; |
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} |
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# Convert to base unit |
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sub convert_to_base { |
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my ($self, $nr) = @_; |
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return $self->is_base_unit ? $nr : ( |
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($self->A + $self->B * $nr) / ($self->C + $self->D * $nr) |
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); |
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} |
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# Convert from one unit to another. Just one scalar value converted. |
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sub scalar_convert { |
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my ($self, $other, $nr) = @_; |
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return undef unless $self->is_compatible ($other); |
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$nr = $self->convert_to_base ($nr); |
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return $other->is_base_unit ? $nr : ( |
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($other->C * $nr - $other->A) / ($other->B - $other->D * $nr) |
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); |
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} |
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# Convert from one unit to another. Convert an array of values. |
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# The user is probably using the array version for performance reasons, |
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# so take some care to reduce number of method invocations. |
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sub vector_convert { |
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my ($self, $other, $vec) = @_; |
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my @out; |
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return undef unless $self->is_compatible ($other); |
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if ($self->is_base_unit) { |
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@out = @$vec; |
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} else { |
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my ($A, $B, $C, $D) = ($self->A, $self->B, $self->C, $self->D); |
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@out = map { ($A + $B * $_) / ($C + $D * $_) } @$vec; |
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} |
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unless ($other->is_base_unit) { |
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my ($A, $B, $C, $D) = ($other->A, $other->B, $other->C, $other->D); |
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$_ = ($C * $_ - $A) / ($B - $D * $_) foreach (@out); |
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} |
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1
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return \@out; |
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} |
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# Accessor routines |
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sub id { shift->{id} }; |
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sub name { shift->{name} }; |
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sub annotation { shift->{annotation} }; |
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sub quantity_type { shift->{quantity_type} }; |
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sub catalog_name { shift->{catalog_name} }; |
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sub catalog_symbol { shift->{catalog_symbol} }; |
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sub description { shift->{description} }; |
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sub base_unit { shift->{base_unit} }; |
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sub display { shift->{display} }; |
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sub A { shift->{A} }; |
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sub B { shift->{B} }; |
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sub C { shift->{C} }; |
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sub D { shift->{D} }; |
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sub is_base_unit { exists shift->{is_base} }; |
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1; |
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__END__ |