godot-docs/classes/class_bone2d.rst

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.. DO NOT EDIT THIS FILE, but the Bone2D.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_Bone2D:

Bone2D
======

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

**Category:** Core

Brief Description
-----------------

Joint used with :ref:`Skeleton2D<class_Skeleton2D>` to control and animate other nodes.

Properties
----------

+---------------------------------------+-------------------------------------------------------------+
| :ref:`float<class_float>`             | :ref:`default_length<class_Bone2D_property_default_length>` |
+---------------------------------------+-------------------------------------------------------------+
| :ref:`Transform2D<class_Transform2D>` | :ref:`rest<class_Bone2D_property_rest>`                     |
+---------------------------------------+-------------------------------------------------------------+

Methods
-------

+---------------------------------------+-------------------------------------------------------------------------------------------+
| void                                  | :ref:`apply_rest<class_Bone2D_method_apply_rest>` **(** **)**                             |
+---------------------------------------+-------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                 | :ref:`get_index_in_skeleton<class_Bone2D_method_get_index_in_skeleton>` **(** **)** const |
+---------------------------------------+-------------------------------------------------------------------------------------------+
| :ref:`Transform2D<class_Transform2D>` | :ref:`get_skeleton_rest<class_Bone2D_method_get_skeleton_rest>` **(** **)** const         |
+---------------------------------------+-------------------------------------------------------------------------------------------+

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

Use a hierarchy of ``Bone2D`` bound to a :ref:`Skeleton2D<class_Skeleton2D>` to control, and animate other :ref:`Node2D<class_Node2D>` nodes.

You can use ``Bone2D`` and ``Skeleton2D`` nodes to animate 2D meshes created with the Polygon 2D UV editor.

Each bone has a :ref:`rest<class_Bone2D_property_rest>` transform that you can reset to with :ref:`apply_rest<class_Bone2D_method_apply_rest>`. These rest poses are relative to the bone's parent.

If in the editor, you can set the rest pose of an entire skeleton using a menu option, from the code, you need to iterate over the bones to set their individual rest poses.

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

.. _class_Bone2D_property_default_length:

- :ref:`float<class_float>` **default_length**

+----------+---------------------------+
| *Setter* | set_default_length(value) |
+----------+---------------------------+
| *Getter* | get_default_length()      |
+----------+---------------------------+

Length of the bone's representation drawn in the editor's viewport in pixels.

----

.. _class_Bone2D_property_rest:

- :ref:`Transform2D<class_Transform2D>` **rest**

+----------+-----------------+
| *Setter* | set_rest(value) |
+----------+-----------------+
| *Getter* | get_rest()      |
+----------+-----------------+

Rest transform of the bone. You can reset the node's transforms to this value using :ref:`apply_rest<class_Bone2D_method_apply_rest>`.

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

.. _class_Bone2D_method_apply_rest:

- void **apply_rest** **(** **)**

Stores the node's current transforms in :ref:`rest<class_Bone2D_property_rest>`.

----

.. _class_Bone2D_method_get_index_in_skeleton:

- :ref:`int<class_int>` **get_index_in_skeleton** **(** **)** const

Returns the node's index as part of the entire skeleton. See :ref:`Skeleton2D<class_Skeleton2D>`.

----

.. _class_Bone2D_method_get_skeleton_rest:

- :ref:`Transform2D<class_Transform2D>` **get_skeleton_rest** **(** **)** const

Returns the node's :ref:`rest<class_Bone2D_property_rest>` ``Transform2D`` if it doesn't have a parent, or its rest pose relative to its parent.