Raw content of Bio::Coordinate::ExtrapolatingPair
<![CDATA[# $Id: ExtrapolatingPair.pm,v 1.6.2.1 2003/02/20 05:11:45 heikki Exp $
#
# bioperl module for Bio::Coordinate::ExtrapolatingPair
#
# Cared for by Heikki Lehvaslaiho <heikki@ebi.ac.uk>
#
# Copyright Heikki Lehvaslaiho
#
# You may distribute this module under the same terms as perl itself
# POD documentation - main docs before the code
=head1 NAME
Bio::Coordinate::ExtrapolatingPair - Continuous match between two coordinate sets
=head1 SYNOPSIS
use Bio::Location::Simple;
use Bio::Coordinate::ExtrapolatingPair;
$match1 = Bio::Location::Simple->new
(-seq_id => 'propeptide', -start => 21, -end => 40, -strand=>1 );
$match2 = Bio::Location::Simple->new
(-seq_id => 'peptide', -start => 1, -end => 20, -strand=>1 );
$pair = Bio::Coordinate::ExtrapolatingPair->
new(-in => $match1,
-out => $match2,
-strict => 1
);
$pos = Bio::Location::Simple->new
(-start => 40, -end => 60, -strand=> 1 );
$res = $pair->map($pos);
$res->start eq 20;
$res->end eq 20;
=head1 DESCRIPTION
This class represents a one continuous match between two coordinate
systems represented by Bio::Location::Simple objects. The relationship
is directed and reversible. It implements methods to ensure internal
consistency, and map continuous and split locations from one
coordinate system to another.
This class is an elaboration of Bio::Coordoinate::Pair. The map
function returns only matches which is the mode needed most of
tehtime. By default the matching regions between coordinate systems
are boundless, so that you can say e.g. that gene starts from here in
the chromosomal coordinate system and extends indefinetely in both
directions. If you want to define the matching regions exactly, you
can do that and set strict() to true.
=head1 FEEDBACK
=head2 Mailing Lists
User feedback is an integral part of the evolution of this and other
Bioperl modules. Send your comments and suggestions preferably to the
Bioperl mailing lists Your participation is much appreciated.
bioperl-l@bioperl.org - General discussion
http://bio.perl.org/MailList.html - About the mailing lists
=head2 Reporting Bugs
report bugs to the Bioperl bug tracking system to help us keep track
the bugs and their resolution. Bug reports can be submitted via email
or the web:
bioperl-bugs@bio.perl.org
http://bugzilla.bioperl.org/
=head1 AUTHOR - Heikki Lehvaslaiho
Email: heikki@ebi.ac.uk
Address:
EMBL Outstation, European Bioinformatics Institute
Wellcome Trust Genome Campus, Hinxton
Cambs. CB10 1SD, United Kingdom
=head1 APPENDIX
The rest of the documentation details each of the object
methods. Internal methods are usually preceded with a _
=cut
# Let the code begin...
package Bio::Coordinate::ExtrapolatingPair;
use vars qw(@ISA );
use strict;
# Object preamble - inherits from Bio::Root::Root
use Bio::Root::Root;
use Bio::LocationI;
use Bio::Coordinate::Pair;
@ISA = qw(Bio::Coordinate::Pair);
sub new {
my($class,@args) = @_;
my $self = $class->SUPER::new(@args);
my($strict) =
$self->_rearrange([qw(STRICT
)],
@args);
$strict && $self->strict($strict);
return $self;
}
=head2 strict
Title : strict
Usage : $obj->strict(1);
Function: Set and read the strictness of the coordinate system.
Example :
Returns : value of input system
Args : boolean
=cut
sub strict {
my ($self,$value) = @_;
if( defined $value) {
$self->{'_strict'} = 1 if $value;
}
return $self->{'_strict'};
}
=head2 map
Title : map
Usage : $newpos = $obj->map($loc);
Function: Map the location from the input coordinate system
to a new value in the output coordinate system.
In extrapolating coodinate system there is no location zero.
Locations are...
Example :
Returns : new location in the output coordinate system or undef
Args : Bio::Location::Simple
=cut
sub map {
my ($self,$value) = @_;
$self->throw("Need to pass me a value.")
unless defined $value;
$self->throw("I need a Bio::Location, not [$value]")
unless $value->isa('Bio::LocationI');
$self->throw("Input coordinate system not set")
unless $self->in;
$self->throw("Output coordinate system not set")
unless $self->out;
my $match;
if ($value->isa("Bio::Location::SplitLocationI")) {
my $split = Bio::Coordinate::Result->new(-seq_id=>$self->out->seq_id);
foreach my $loc ( sort { $a->start <=> $b->start }
$value->sub_Location ) {
$match = $self->_map($loc);
$split->add_sub_Location($match) if $match;
}
$split->each_Location ? (return $split) : (return undef) ;
} else {
return $self->_map($value);
}
}
=head2 _map
Title : _map
Usage : $newpos = $obj->_map($simpleloc);
Function: Internal method that does the actual mapping. Called
multiple times by map() if the location to be mapped is a
split location
Example :
Returns : new location in the output coordinate system or undef
Args : Bio::Location::Simple
=cut
sub _map {
my ($self,$value) = @_;
my ($offset, $start, $end);
if ($self->strand == -1) {
$offset = $self->in->end + $self->out->start;
$start = $offset - $value->end;
$end = $offset - $value->start ;
} else { # undef, 0 or 1
$offset = $self->in->start - $self->out->start;
$start = $value->start - $offset;
$end = $value->end - $offset;
}
# strict prevents matches outside stated range
if ($self->strict) {
return undef if $start < 0 and $end < 0;
return undef if $start > $self->out->end;
$start = 1 if $start < 0;
$end = $self->out->end if $end > $self->out->end;
}
my $match = Bio::Location::Simple->
new(-start => $start,
-end => $end,
-strand => $self->strand,
-seq_id => $self->out->seq_id,
-location_type => $value->location_type
);
$match->strand($match->strand * $value->strand) if $value->strand;
bless $match, 'Bio::Coordinate::Result::Match';
return $match;
}
1;
]]>