Range documentation.

Title : new
Usage : $range1 = Bio::LiveSeq::Range->new(-seq => $obj_ref,
-start => $beginlabel,
-end => $endlabel, -strand => 1);
Function: generates a new Bio::LiveSeq::Range Returns : reference to a new object of class Range Errorcode -1 Args : two labels, an obj_ref and an integer strand 1=forward strand, strand -1=reverse strand if strand not specified, it defaults to 1 the -seq argument must point to the underlying DNA LiveSeq object

sub new {

  my ($thing, %args) = @_;
  my $class = ref($thing) || $thing;
  my ($obj,%range);

  my ($seq,$start,$end,$strand)=($args{-seq},$args{-start},$args{-end},$args{-strand});

  $obj =\% range;
  $obj = bless $obj, $class;

  unless ($seq->valid($start)) {
    $obj->warn("$class not initialised because start label not valid");
    return (-1);
  }
  unless ($seq->valid($end)) {
    $obj->warn("$class not initialised because end label not valid");
    return (-1);
  }
  unless (defined $strand) {
    $strand = 1;
  }
  if (($strand != 1)&&($strand != -1)) {
    $obj->warn("$class not initialised because strand identifier not valid. Use 1 (forward strand) or -1 (reverse strand).");
    return (-1);
  }
  if ($start eq $end) {
    $obj->warn("$class reports: start and end label are the same....");
  } else {
    unless ($seq->follows($start,$end,$strand)==1) {
      $obj->warn("Fatal: end label $end doesn't follow start label $start for strand $strand!");
      return (-1);
    }
  }
  #if ($strand == 1) {
  #  unless ($seq->is_downstream($start,$end)==1) {
  #    croak "Fatal: end label not downstream of start label for forward strand!";
  #  }
  #} else {
  #  unless ($seq->is_upstream($start,$end)==1) {
  #    croak "Fatal: end label not upstream of start label for reverse strand!";
  #  }
  #}
  $obj->{'seq'}=$seq;
  $obj->{'start'}=$start;
  $obj->{'end'}=$end;
  $obj->{'strand'}=$strand;
  return $obj;

}