godot-docs/classes/class_navigationlink2d.rst

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.. _class_NavigationLink2D:

NavigationLink2D
================

**Inherits:** :ref:`Node2D<class_Node2D>` **<** :ref:`CanvasItem<class_CanvasItem>` **<** :ref:`Node<class_Node>` **<** :ref:`Object<class_Object>`

Creates a link between two positions that :ref:`NavigationServer2D<class_NavigationServer2D>` can route agents through.

.. rst-class:: classref-introduction-group

Description
-----------

Creates a link between two positions that :ref:`NavigationServer2D<class_NavigationServer2D>` can route agents through.  Links can be used to express navigation methods that aren't just traveling along the surface of the navigation mesh, like zip-lines, teleporters, or jumping across gaps.

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Tutorials
---------

- :doc:`Using NavigationLinks <../tutorials/navigation/navigation_using_navigationlinks>`

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Properties
----------

.. table::
   :widths: auto

   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`bool<class_bool>`       | :ref:`bidirectional<class_NavigationLink2D_property_bidirectional>`         | ``true``          |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`bool<class_bool>`       | :ref:`enabled<class_NavigationLink2D_property_enabled>`                     | ``true``          |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`Vector2<class_Vector2>` | :ref:`end_position<class_NavigationLink2D_property_end_position>`           | ``Vector2(0, 0)`` |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`float<class_float>`     | :ref:`enter_cost<class_NavigationLink2D_property_enter_cost>`               | ``0.0``           |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`int<class_int>`         | :ref:`navigation_layers<class_NavigationLink2D_property_navigation_layers>` | ``1``             |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`Vector2<class_Vector2>` | :ref:`start_position<class_NavigationLink2D_property_start_position>`       | ``Vector2(0, 0)`` |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+
   | :ref:`float<class_float>`     | :ref:`travel_cost<class_NavigationLink2D_property_travel_cost>`             | ``1.0``           |
   +-------------------------------+-----------------------------------------------------------------------------+-------------------+

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Methods
-------

.. table::
   :widths: auto

   +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | :ref:`bool<class_bool>` | :ref:`get_navigation_layer_value<class_NavigationLink2D_method_get_navigation_layer_value>` **(** :ref:`int<class_int>` layer_number **)** |const|                        |
   +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
   | void                    | :ref:`set_navigation_layer_value<class_NavigationLink2D_method_set_navigation_layer_value>` **(** :ref:`int<class_int>` layer_number, :ref:`bool<class_bool>` value **)** |
   +-------------------------+---------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

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----

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Property Descriptions
---------------------

.. _class_NavigationLink2D_property_bidirectional:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **bidirectional** = ``true``

.. rst-class:: classref-property-setget

- void **set_bidirectional** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_bidirectional** **(** **)**

Whether this link can be traveled in both directions or only from :ref:`start_position<class_NavigationLink2D_property_start_position>` to :ref:`end_position<class_NavigationLink2D_property_end_position>`.

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----

.. _class_NavigationLink2D_property_enabled:

.. rst-class:: classref-property

:ref:`bool<class_bool>` **enabled** = ``true``

.. rst-class:: classref-property-setget

- void **set_enabled** **(** :ref:`bool<class_bool>` value **)**
- :ref:`bool<class_bool>` **is_enabled** **(** **)**

Whether this link is currently active. If ``false``, :ref:`NavigationServer2D.map_get_path<class_NavigationServer2D_method_map_get_path>` will ignore this link.

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----

.. _class_NavigationLink2D_property_end_position:

.. rst-class:: classref-property

:ref:`Vector2<class_Vector2>` **end_position** = ``Vector2(0, 0)``

.. rst-class:: classref-property-setget

- void **set_end_position** **(** :ref:`Vector2<class_Vector2>` value **)**
- :ref:`Vector2<class_Vector2>` **get_end_position** **(** **)**

Ending position of the link.

This position will search out the nearest polygon in the navigation mesh to attach to.

The distance the link will search is controlled by :ref:`NavigationServer2D.map_set_link_connection_radius<class_NavigationServer2D_method_map_set_link_connection_radius>`.

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.. _class_NavigationLink2D_property_enter_cost:

.. rst-class:: classref-property

:ref:`float<class_float>` **enter_cost** = ``0.0``

.. rst-class:: classref-property-setget

- void **set_enter_cost** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_enter_cost** **(** **)**

When pathfinding enters this link from another regions navigation mesh the ``enter_cost`` value is added to the path distance for determining the shortest path.

.. rst-class:: classref-item-separator

----

.. _class_NavigationLink2D_property_navigation_layers:

.. rst-class:: classref-property

:ref:`int<class_int>` **navigation_layers** = ``1``

.. rst-class:: classref-property-setget

- void **set_navigation_layers** **(** :ref:`int<class_int>` value **)**
- :ref:`int<class_int>` **get_navigation_layers** **(** **)**

A bitfield determining all navigation layers the link belongs to. These navigation layers will be checked when requesting a path with :ref:`NavigationServer2D.map_get_path<class_NavigationServer2D_method_map_get_path>`.

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----

.. _class_NavigationLink2D_property_start_position:

.. rst-class:: classref-property

:ref:`Vector2<class_Vector2>` **start_position** = ``Vector2(0, 0)``

.. rst-class:: classref-property-setget

- void **set_start_position** **(** :ref:`Vector2<class_Vector2>` value **)**
- :ref:`Vector2<class_Vector2>` **get_start_position** **(** **)**

Starting position of the link.

This position will search out the nearest polygon in the navigation mesh to attach to.

The distance the link will search is controlled by :ref:`NavigationServer2D.map_set_link_connection_radius<class_NavigationServer2D_method_map_set_link_connection_radius>`.

.. rst-class:: classref-item-separator

----

.. _class_NavigationLink2D_property_travel_cost:

.. rst-class:: classref-property

:ref:`float<class_float>` **travel_cost** = ``1.0``

.. rst-class:: classref-property-setget

- void **set_travel_cost** **(** :ref:`float<class_float>` value **)**
- :ref:`float<class_float>` **get_travel_cost** **(** **)**

When pathfinding moves along the link the traveled distance is multiplied with ``travel_cost`` for determining the shortest path.

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----

.. rst-class:: classref-descriptions-group

Method Descriptions
-------------------

.. _class_NavigationLink2D_method_get_navigation_layer_value:

.. rst-class:: classref-method

:ref:`bool<class_bool>` **get_navigation_layer_value** **(** :ref:`int<class_int>` layer_number **)** |const|

Returns whether or not the specified layer of the :ref:`navigation_layers<class_NavigationLink2D_property_navigation_layers>` bitmask is enabled, given a ``layer_number`` between 1 and 32.

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----

.. _class_NavigationLink2D_method_set_navigation_layer_value:

.. rst-class:: classref-method

void **set_navigation_layer_value** **(** :ref:`int<class_int>` layer_number, :ref:`bool<class_bool>` value **)**

Based on ``value``, enables or disables the specified layer in the :ref:`navigation_layers<class_NavigationLink2D_property_navigation_layers>` bitmask, given a ``layer_number`` between 1 and 32.

.. |virtual| replace:: :abbr:`virtual (This method should typically be overridden by the user to have any effect.)`
.. |const| replace:: :abbr:`const (This method has no side effects. It doesn't modify any of the instance's member variables.)`
.. |vararg| replace:: :abbr:`vararg (This method accepts any number of arguments after the ones described here.)`
.. |constructor| replace:: :abbr:`constructor (This method is used to construct a type.)`
.. |static| replace:: :abbr:`static (This method doesn't need an instance to be called, so it can be called directly using the class name.)`
.. |operator| replace:: :abbr:`operator (This method describes a valid operator to use with this type as left-hand operand.)`