Bio::Map::RelativeI(3) Interface for describing what a Position's coordiantes are


# do not use this module directly
# See Bio::Map::Relative for an example of
# implementation.


A Relative object is used to describe what the co-ordinates (numerical(), start(), end()) of a Position are relative to. By default they are implicitly assumed to be relative to the start of the map the Position is on. But setting the relative() of a Position to one of these objects lets us define otherwise.


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The rest of the documentation details each of the object methods. Internal methods are usually preceded with a _


 Title   : absolute_conversion
 Usage   : my $absolute_coord = $relative->absolute_conversion($pos);
 Function: Convert the start co-ordinate of the supplied position into a number
           relative to the start of its map.
 Returns : scalar number
 Args    : Bio::Map::PositionI object


 Title   : type
 Usage   : my $type = $relative->type();
 Function: Get the type of thing we are relative to. The types correspond
           to a method name, so the value of what we are relative to can
           subsequently be found by $value = $relative->$type;
           Note that type is set by the last method that was set, or during
 Returns : the string 'map', 'element' or 'position', or undef
 Args    : none


 Title   : map
 Usage   : my $int = $relative->map();
 Function: Get/set the distance from the start of the map that the Position's
           co-ordiantes are relative to.
 Returns : int
 Args    : none to get, OR
           int to set; a value of 0 means relative to the start of the map.


 Title   : element
 Usage   : my $element = $relative->element();
 Function: Get/set the map element (Mappable) the Position is relative to. If
           the Mappable has more than one Position on the Position's map, we
           will be relative to the Mappable's first Position on the map.
 Returns : Bio::Map::MappableI
 Args    : none got get, OR
           Bio::Map::MappableI to set


 Title   : position
 Usage   : my $position = $relative->position();
 Function: Get/set the Position your Position is relative to. Your Position
           will be made relative to the start of this supplied Position. It
           makes no difference what maps the Positions are on.
 Returns : Bio::Map::PositionI
 Args    : none got get, OR
           Bio::Map::PositionI to set


 Title   : description
 Usage   : my $description = $relative->description();
 Function: Get/set a textual description of what this relative describes.
 Returns : string
 Args    : none to get, OR
           string to set