godot-docs/classes/class_animation.rst

.. Generated automatically by doc/tools/makerst.py in Godot's source tree.
.. DO NOT EDIT THIS FILE, but the Animation.xml source instead.
.. The source is found in doc/classes or modules/<name>/doc_classes.

.. _class_Animation:

Animation
=========

**Inherits:** :ref:`Resource<class_Resource>` **<** :ref:`Reference<class_Reference>` **<** :ref:`Object<class_Object>`

**Category:** Core

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

Contains data used to animate everything in the engine.

Properties
----------

+---------------------------+---------------------------------------+
| :ref:`float<class_float>` | :ref:`length<class_Animation_length>` |
+---------------------------+---------------------------------------+
| :ref:`bool<class_bool>`   | :ref:`loop<class_Animation_loop>`     |
+---------------------------+---------------------------------------+
| :ref:`float<class_float>` | :ref:`step<class_Animation_step>`     |
+---------------------------+---------------------------------------+

Methods
-------

+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`add_track<class_Animation_add_track>` **(** :ref:`TrackType<enum_Animation_TrackType>` type, :ref:`int<class_int>` at_position=-1 **)**                                                                                                                                                       |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`String<class_String>`                                 | :ref:`animation_track_get_key_animation<class_Animation_animation_track_get_key_animation>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                              |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`animation_track_insert_key<class_Animation_animation_track_insert_key>` **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`String<class_String>` animation **)**                                                                                                        |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`animation_track_set_key_animation<class_Animation_animation_track_set_key_animation>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`String<class_String>` animation **)**                                                                                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`audio_track_get_key_end_offset<class_Animation_audio_track_get_key_end_offset>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                    |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`audio_track_get_key_start_offset<class_Animation_audio_track_get_key_start_offset>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Resource<class_Resource>`                             | :ref:`audio_track_get_key_stream<class_Animation_audio_track_get_key_stream>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                            |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`audio_track_insert_key<class_Animation_audio_track_insert_key>` **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`Resource<class_Resource>` stream, :ref:`float<class_float>` start_offset=0, :ref:`float<class_float>` end_offset=0 **)**                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`audio_track_set_key_end_offset<class_Animation_audio_track_set_key_end_offset>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` offset **)**                                                                                                        |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`audio_track_set_key_start_offset<class_Animation_audio_track_set_key_start_offset>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` offset **)**                                                                                                    |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`audio_track_set_key_stream<class_Animation_audio_track_set_key_stream>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Resource<class_Resource>` stream **)**                                                                                                          |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Vector2<class_Vector2>`                               | :ref:`bezier_track_get_key_in_handle<class_Animation_bezier_track_get_key_in_handle>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                    |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Vector2<class_Vector2>`                               | :ref:`bezier_track_get_key_out_handle<class_Animation_bezier_track_get_key_out_handle>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                  |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`bezier_track_get_key_value<class_Animation_bezier_track_get_key_value>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                            |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`bezier_track_insert_key<class_Animation_bezier_track_insert_key>` **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`float<class_float>` value, :ref:`Vector2<class_Vector2>` in_handle=Vector2( 0, 0 ), :ref:`Vector2<class_Vector2>` out_handle=Vector2( 0, 0 ) **)** |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`bezier_track_interpolate<class_Animation_bezier_track_interpolate>` **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time **)** const                                                                                                                                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`bezier_track_set_key_in_handle<class_Animation_bezier_track_set_key_in_handle>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Vector2<class_Vector2>` in_handle **)**                                                                                                 |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`bezier_track_set_key_out_handle<class_Animation_bezier_track_set_key_out_handle>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Vector2<class_Vector2>` out_handle **)**                                                                                              |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`bezier_track_set_key_value<class_Animation_bezier_track_set_key_value>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` value **)**                                                                                                                 |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`clear<class_Animation_clear>` **(** **)**                                                                                                                                                                                                                                                     |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`copy_track<class_Animation_copy_track>` **(** :ref:`int<class_int>` track, :ref:`Animation<class_Animation>` to_animation **)**                                                                                                                                                               |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`find_track<class_Animation_find_track>` **(** :ref:`NodePath<class_NodePath>` path **)** const                                                                                                                                                                                                |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`get_track_count<class_Animation_get_track_count>` **(** **)** const                                                                                                                                                                                                                           |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`PoolIntArray<class_PoolIntArray>`                     | :ref:`method_track_get_key_indices<class_Animation_method_track_get_key_indices>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec, :ref:`float<class_float>` delta **)** const                                                                                                  |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`String<class_String>`                                 | :ref:`method_track_get_name<class_Animation_method_track_get_name>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                                      |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Array<class_Array>`                                   | :ref:`method_track_get_params<class_Animation_method_track_get_params>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                                  |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`remove_track<class_Animation_remove_track>` **(** :ref:`int<class_int>` idx **)**                                                                                                                                                                                                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`track_find_key<class_Animation_track_find_key>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`bool<class_bool>` exact=false **)** const                                                                                                                              |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                                     | :ref:`track_get_interpolation_loop_wrap<class_Animation_track_get_interpolation_loop_wrap>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`InterpolationType<enum_Animation_InterpolationType>`  | :ref:`track_get_interpolation_type<class_Animation_track_get_interpolation_type>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                       |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`track_get_key_count<class_Animation_track_get_key_count>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                                         |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`track_get_key_time<class_Animation_track_get_key_time>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                                            |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`float<class_float>`                                   | :ref:`track_get_key_transition<class_Animation_track_get_key_transition>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                                |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Variant<class_Variant>`                               | :ref:`track_get_key_value<class_Animation_track_get_key_value>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const                                                                                                                                                          |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`NodePath<class_NodePath>`                             | :ref:`track_get_path<class_Animation_track_get_path>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                                                   |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`TrackType<enum_Animation_TrackType>`                  | :ref:`track_get_type<class_Animation_track_get_type>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                                                   |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_insert_key<class_Animation_track_insert_key>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`Variant<class_Variant>` key, :ref:`float<class_float>` transition=1 **)**                                                                                          |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                                     | :ref:`track_is_enabled<class_Animation_track_is_enabled>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                                               |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`bool<class_bool>`                                     | :ref:`track_is_imported<class_Animation_track_is_imported>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                                             |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_move_down<class_Animation_track_move_down>` **(** :ref:`int<class_int>` idx **)**                                                                                                                                                                                                       |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_move_up<class_Animation_track_move_up>` **(** :ref:`int<class_int>` idx **)**                                                                                                                                                                                                           |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_remove_key<class_Animation_track_remove_key>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)**                                                                                                                                                                      |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_remove_key_at_position<class_Animation_track_remove_key_at_position>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` position **)**                                                                                                                                         |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_enabled<class_Animation_track_set_enabled>` **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` enabled **)**                                                                                                                                                                  |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_imported<class_Animation_track_set_imported>` **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` imported **)**                                                                                                                                                               |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_interpolation_loop_wrap<class_Animation_track_set_interpolation_loop_wrap>` **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` interpolation **)**                                                                                                                            |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_interpolation_type<class_Animation_track_set_interpolation_type>` **(** :ref:`int<class_int>` idx, :ref:`InterpolationType<enum_Animation_InterpolationType>` interpolation **)**                                                                                                   |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_key_transition<class_Animation_track_set_key_transition>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` transition **)**                                                                                                                |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_key_value<class_Animation_track_set_key_value>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key, :ref:`Variant<class_Variant>` value **)**                                                                                                                               |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_set_path<class_Animation_track_set_path>` **(** :ref:`int<class_int>` idx, :ref:`NodePath<class_NodePath>` path **)**                                                                                                                                                                   |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`track_swap<class_Animation_track_swap>` **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` with_idx **)**                                                                                                                                                                                 |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`int<class_int>`                                       | :ref:`transform_track_insert_key<class_Animation_transform_track_insert_key>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`Vector3<class_Vector3>` location, :ref:`Quat<class_Quat>` rotation, :ref:`Vector3<class_Vector3>` scale **)**                                  |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`Array<class_Array>`                                   | :ref:`transform_track_interpolate<class_Animation_transform_track_interpolate>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec **)** const                                                                                                                                     |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`PoolIntArray<class_PoolIntArray>`                     | :ref:`value_track_get_key_indices<class_Animation_value_track_get_key_indices>` **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec, :ref:`float<class_float>` delta **)** const                                                                                                    |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| :ref:`UpdateMode<enum_Animation_UpdateMode>`                | :ref:`value_track_get_update_mode<class_Animation_value_track_get_update_mode>` **(** :ref:`int<class_int>` idx **)** const                                                                                                                                                                         |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| void                                                        | :ref:`value_track_set_update_mode<class_Animation_value_track_set_update_mode>` **(** :ref:`int<class_int>` idx, :ref:`UpdateMode<enum_Animation_UpdateMode>` mode **)**                                                                                                                            |
+-------------------------------------------------------------+-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------+

Enumerations
------------

.. _enum_Animation_UpdateMode:

enum **UpdateMode**:

- **UPDATE_CONTINUOUS** = **0** --- Update between keyframes.

- **UPDATE_DISCRETE** = **1** --- Update at the keyframes and hold the value.

- **UPDATE_TRIGGER** = **2** --- Update at the keyframes.

- **UPDATE_CAPTURE** = **3**

.. _enum_Animation_InterpolationType:

enum **InterpolationType**:

- **INTERPOLATION_NEAREST** = **0** --- No interpolation (nearest value).

- **INTERPOLATION_LINEAR** = **1** --- Linear interpolation.

- **INTERPOLATION_CUBIC** = **2** --- Cubic interpolation.

.. _enum_Animation_TrackType:

enum **TrackType**:

- **TYPE_VALUE** = **0** --- Value tracks set values in node properties, but only those which can be Interpolated.

- **TYPE_TRANSFORM** = **1** --- Transform tracks are used to change node local transforms or skeleton pose bones. Transitions are Interpolated.

- **TYPE_METHOD** = **2** --- Method tracks call functions with given arguments per key.

- **TYPE_BEZIER** = **3**

- **TYPE_AUDIO** = **4**

- **TYPE_ANIMATION** = **5**

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

An Animation resource contains data used to animate everything in the engine. Animations are divided into tracks, and each track must be linked to a node. The state of that node can be changed through time, by adding timed keys (events) to the track.

::

    # This creates an animation that makes the node "Enemy" move to the right by
    # 100 pixels in 1 second.
    var animation = Animation.new()
    var track_index = animation.add_track(Animation.TYPE_VALUE)
    animation.track_set_path(track_index, "Enemy:position.x")
    animation.track_insert_key(track_index, 0.0, 0)
    animation.track_insert_key(track_index, 0.5, 100)

Animations are just data containers, and must be added to nodes such as an :ref:`AnimationPlayer<class_AnimationPlayer>` or :ref:`AnimationTreePlayer<class_AnimationTreePlayer>` to be played back.

Tutorials
---------

- :doc:`../tutorials/animation/index`

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

.. _class_Animation_length:

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

+----------+-------------------+
| *Setter* | set_length(value) |
+----------+-------------------+
| *Getter* | get_length()      |
+----------+-------------------+

The total length of the animation (in seconds). Note that length is not delimited by the last key, as this one may be before or after the end to ensure correct interpolation and looping.

.. _class_Animation_loop:

- :ref:`bool<class_bool>` **loop**

+----------+-----------------+
| *Setter* | set_loop(value) |
+----------+-----------------+
| *Getter* | has_loop()      |
+----------+-----------------+

A flag indicating that the animation must loop. This is uses for correct interpolation of animation cycles, and for hinting the player that it must restart the animation.

.. _class_Animation_step:

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

+----------+-----------------+
| *Setter* | set_step(value) |
+----------+-----------------+
| *Getter* | get_step()      |
+----------+-----------------+

The animation step value.

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

.. _class_Animation_add_track:

- :ref:`int<class_int>` **add_track** **(** :ref:`TrackType<enum_Animation_TrackType>` type, :ref:`int<class_int>` at_position=-1 **)**

Add a track to the Animation. The track type must be specified as any of the values in the TYPE\_\* enumeration.

.. _class_Animation_animation_track_get_key_animation:

- :ref:`String<class_String>` **animation_track_get_key_animation** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_animation_track_insert_key:

- :ref:`int<class_int>` **animation_track_insert_key** **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`String<class_String>` animation **)**

.. _class_Animation_animation_track_set_key_animation:

- void **animation_track_set_key_animation** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`String<class_String>` animation **)**

.. _class_Animation_audio_track_get_key_end_offset:

- :ref:`float<class_float>` **audio_track_get_key_end_offset** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_audio_track_get_key_start_offset:

- :ref:`float<class_float>` **audio_track_get_key_start_offset** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_audio_track_get_key_stream:

- :ref:`Resource<class_Resource>` **audio_track_get_key_stream** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_audio_track_insert_key:

- :ref:`int<class_int>` **audio_track_insert_key** **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`Resource<class_Resource>` stream, :ref:`float<class_float>` start_offset=0, :ref:`float<class_float>` end_offset=0 **)**

.. _class_Animation_audio_track_set_key_end_offset:

- void **audio_track_set_key_end_offset** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` offset **)**

.. _class_Animation_audio_track_set_key_start_offset:

- void **audio_track_set_key_start_offset** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` offset **)**

.. _class_Animation_audio_track_set_key_stream:

- void **audio_track_set_key_stream** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Resource<class_Resource>` stream **)**

.. _class_Animation_bezier_track_get_key_in_handle:

- :ref:`Vector2<class_Vector2>` **bezier_track_get_key_in_handle** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_bezier_track_get_key_out_handle:

- :ref:`Vector2<class_Vector2>` **bezier_track_get_key_out_handle** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_bezier_track_get_key_value:

- :ref:`float<class_float>` **bezier_track_get_key_value** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

.. _class_Animation_bezier_track_insert_key:

- :ref:`int<class_int>` **bezier_track_insert_key** **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time, :ref:`float<class_float>` value, :ref:`Vector2<class_Vector2>` in_handle=Vector2( 0, 0 ), :ref:`Vector2<class_Vector2>` out_handle=Vector2( 0, 0 ) **)**

.. _class_Animation_bezier_track_interpolate:

- :ref:`float<class_float>` **bezier_track_interpolate** **(** :ref:`int<class_int>` track, :ref:`float<class_float>` time **)** const

.. _class_Animation_bezier_track_set_key_in_handle:

- void **bezier_track_set_key_in_handle** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Vector2<class_Vector2>` in_handle **)**

.. _class_Animation_bezier_track_set_key_out_handle:

- void **bezier_track_set_key_out_handle** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`Vector2<class_Vector2>` out_handle **)**

.. _class_Animation_bezier_track_set_key_value:

- void **bezier_track_set_key_value** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` value **)**

.. _class_Animation_clear:

- void **clear** **(** **)**

Clear the animation (clear all tracks and reset all).

.. _class_Animation_copy_track:

- void **copy_track** **(** :ref:`int<class_int>` track, :ref:`Animation<class_Animation>` to_animation **)**

Adds a new track that is a copy of the given track from ``to_animation``.

.. _class_Animation_find_track:

- :ref:`int<class_int>` **find_track** **(** :ref:`NodePath<class_NodePath>` path **)** const

Return the index of the specified track. If the track is not found, return -1.

.. _class_Animation_get_track_count:

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

Return the amount of tracks in the animation.

.. _class_Animation_method_track_get_key_indices:

- :ref:`PoolIntArray<class_PoolIntArray>` **method_track_get_key_indices** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec, :ref:`float<class_float>` delta **)** const

Return all the key indices of a method track, given a position and delta time.

.. _class_Animation_method_track_get_name:

- :ref:`String<class_String>` **method_track_get_name** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

Return the method name of a method track.

.. _class_Animation_method_track_get_params:

- :ref:`Array<class_Array>` **method_track_get_params** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

Return the arguments values to be called on a method track for a given key in a given track.

.. _class_Animation_remove_track:

- void **remove_track** **(** :ref:`int<class_int>` idx **)**

Remove a track by specifying the track index.

.. _class_Animation_track_find_key:

- :ref:`int<class_int>` **track_find_key** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`bool<class_bool>` exact=false **)** const

Find the key index by time in a given track. Optionally, only find it if the exact time is given.

.. _class_Animation_track_get_interpolation_loop_wrap:

- :ref:`bool<class_bool>` **track_get_interpolation_loop_wrap** **(** :ref:`int<class_int>` idx **)** const

Returns ``true`` if the track at ``idx`` wraps the interpolation loop. Default value: ``true``.

.. _class_Animation_track_get_interpolation_type:

- :ref:`InterpolationType<enum_Animation_InterpolationType>` **track_get_interpolation_type** **(** :ref:`int<class_int>` idx **)** const

Return the interpolation type of a given track, from the INTERPOLATION\_\* enum.

.. _class_Animation_track_get_key_count:

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

Return the amount of keys in a given track.

.. _class_Animation_track_get_key_time:

- :ref:`float<class_float>` **track_get_key_time** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

Return the time at which the key is located.

.. _class_Animation_track_get_key_transition:

- :ref:`float<class_float>` **track_get_key_transition** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

Return the transition curve (easing) for a specific key (see built-in math function "ease").

.. _class_Animation_track_get_key_value:

- :ref:`Variant<class_Variant>` **track_get_key_value** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)** const

Return the value of a given key in a given track.

.. _class_Animation_track_get_path:

- :ref:`NodePath<class_NodePath>` **track_get_path** **(** :ref:`int<class_int>` idx **)** const

Get the path of a track. for more information on the path format, see :ref:`track_set_path<class_Animation_track_set_path>`

.. _class_Animation_track_get_type:

- :ref:`TrackType<enum_Animation_TrackType>` **track_get_type** **(** :ref:`int<class_int>` idx **)** const

Get the type of a track.

.. _class_Animation_track_insert_key:

- void **track_insert_key** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`Variant<class_Variant>` key, :ref:`float<class_float>` transition=1 **)**

Insert a generic key in a given track.

.. _class_Animation_track_is_enabled:

- :ref:`bool<class_bool>` **track_is_enabled** **(** :ref:`int<class_int>` idx **)** const

Returns ``true`` if the track at index ``idx`` is enabled.

.. _class_Animation_track_is_imported:

- :ref:`bool<class_bool>` **track_is_imported** **(** :ref:`int<class_int>` idx **)** const

Return true if the given track is imported. Else, return false.

.. _class_Animation_track_move_down:

- void **track_move_down** **(** :ref:`int<class_int>` idx **)**

Move a track down.

.. _class_Animation_track_move_up:

- void **track_move_up** **(** :ref:`int<class_int>` idx **)**

Move a track up.

.. _class_Animation_track_remove_key:

- void **track_remove_key** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx **)**

Remove a key by index in a given track.

.. _class_Animation_track_remove_key_at_position:

- void **track_remove_key_at_position** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` position **)**

Remove a key by position (seconds) in a given track.

.. _class_Animation_track_set_enabled:

- void **track_set_enabled** **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` enabled **)**

Enables/disables the given track. Tracks are enabled by default.

.. _class_Animation_track_set_imported:

- void **track_set_imported** **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` imported **)**

Set the given track as imported or not.

.. _class_Animation_track_set_interpolation_loop_wrap:

- void **track_set_interpolation_loop_wrap** **(** :ref:`int<class_int>` idx, :ref:`bool<class_bool>` interpolation **)**

If ``true`` the track at ``idx`` wraps the interpolation loop.

.. _class_Animation_track_set_interpolation_type:

- void **track_set_interpolation_type** **(** :ref:`int<class_int>` idx, :ref:`InterpolationType<enum_Animation_InterpolationType>` interpolation **)**

Set the interpolation type of a given track, from the INTERPOLATION\_\* enum.

.. _class_Animation_track_set_key_transition:

- void **track_set_key_transition** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key_idx, :ref:`float<class_float>` transition **)**

Set the transition curve (easing) for a specific key (see built-in math function "ease").

.. _class_Animation_track_set_key_value:

- void **track_set_key_value** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` key, :ref:`Variant<class_Variant>` value **)**

Set the value of an existing key.

.. _class_Animation_track_set_path:

- void **track_set_path** **(** :ref:`int<class_int>` idx, :ref:`NodePath<class_NodePath>` path **)**

Set the path of a track. Paths must be valid scene-tree paths to a node, and must be specified starting from the parent node of the node that will reproduce the animation. Tracks that control properties or bones must append their name after the path, separated by ":".

**Example:** "character/skeleton:ankle" or "character/mesh:transform/local".

.. _class_Animation_track_swap:

- void **track_swap** **(** :ref:`int<class_int>` idx, :ref:`int<class_int>` with_idx **)**

.. _class_Animation_transform_track_insert_key:

- :ref:`int<class_int>` **transform_track_insert_key** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time, :ref:`Vector3<class_Vector3>` location, :ref:`Quat<class_Quat>` rotation, :ref:`Vector3<class_Vector3>` scale **)**

Insert a transform key for a transform track.

.. _class_Animation_transform_track_interpolate:

- :ref:`Array<class_Array>` **transform_track_interpolate** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec **)** const

Return the interpolated value of a transform track at a given time (in seconds). An array consisting of 3 elements: position (:ref:`Vector3<class_Vector3>`), rotation (:ref:`Quat<class_Quat>`) and scale (:ref:`Vector3<class_Vector3>`).

.. _class_Animation_value_track_get_key_indices:

- :ref:`PoolIntArray<class_PoolIntArray>` **value_track_get_key_indices** **(** :ref:`int<class_int>` idx, :ref:`float<class_float>` time_sec, :ref:`float<class_float>` delta **)** const

Return all the key indices of a value track, given a position and delta time.

.. _class_Animation_value_track_get_update_mode:

- :ref:`UpdateMode<enum_Animation_UpdateMode>` **value_track_get_update_mode** **(** :ref:`int<class_int>` idx **)** const

Return the update mode of a value track.

.. _class_Animation_value_track_set_update_mode:

- void **value_track_set_update_mode** **(** :ref:`int<class_int>` idx, :ref:`UpdateMode<enum_Animation_UpdateMode>` mode **)**

Set the update mode (UPDATE\_\*) of a value track.