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name: RotationCurve
type: class
memory_category: Instances
summary: |
  Represents a sequence of rotations and the interpolation curve between them.
description: |
  This class holds a sorted list of
  `Datatype.RotationCurveKey|RotationCurveKeys` that represent a sequence of
  rotations. The shape of the interpolation curve between two keys is determined
  by the `Datatype.RotationCurveKey.Interpolation` type.
code_samples: []
inherits:
  - Instance
descendants: []
tags: []
deprecation_message: ''
properties:
  - name: RotationCurve.Length
    summary: |
      Number of rotation keys in this curve.
    description: |
      Number of rotation keys in this curve.
    code_samples: []
    type: int
    tags:
      - ReadOnly
      - NotReplicated
    deprecation_message: ''
    security:
      read: None
      write: None
    thread_safety: ReadSafe
    category: Data
    serialization:
      can_load: false
      can_save: true
    capabilities:
      - Basic
methods:
  - name: RotationCurve:GetKeyAtIndex
    summary: |
      Returns a copy of a key at a given index.
    description: |
      Returns a copy of a key at a given index.
    code_samples: []
    parameters:
      - name: index
        type: int
        default:
        summary: ''
    returns:
      - type: RotationCurveKey
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:GetKeyIndicesAtTime
    summary: |
      Returns the index of the last and first key of a period of time.
    description: |
      The first item in the returned array is the index of the last key with
      time less than or equal to `time` (or the lesser of either 1 or the curve
      length if no key was found). The second item in the returned array is the
      index of the first key with time greater than or equal to `time` (or the
      curve length if no key was found satisfying the inequality).
    code_samples: []
    parameters:
      - name: time
        type: float
        default:
        summary: ''
    returns:
      - type: Array
        summary: ''
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:GetKeys
    summary: |
      Returns a copy of all the keys in the rotation curve as a Luau array of
      `Datatype.RotationCurveKey|RotationCurveKeys`.
    description: |
      Returns a copy of all the keys in the rotation curve as a Luau array of
      `Datatype.RotationCurveKey|RotationCurveKeys`.
    code_samples: []
    parameters: []
    returns:
      - type: Array
        summary: |
          Array of `Datatype.RotationCurveKey|RotationCurveKeys`.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:GetValueAtTime
    summary: |
      Samples the rotation curve at a given time and returns the corresponding
      rotation as a `Datatype.CFrame`.
    description: |
      Samples the rotation curve at a given time and returns the corresponding
      rotation as a `Datatype.CFrame`. Empty rotation curves are evaluated as
      `Datatype.CFrame.identity`.
    code_samples: []
    parameters:
      - name: time
        type: float
        default:
        summary: |
          Time at which to sample the curve.
    returns:
      - type: CoordinateFrame?
        summary: |
          Value of the curve at the requested `time`.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:InsertKey
    summary: |
      Adds the key passed as an argument to this curve. If a key at the same
      time is found, it will be replaced.
    description: |
      Adds the key passed as an argument to this curve. If a key at the same
      time is found, it will be replaced. In the returned array, the first value
      is `true` if a key was added or `false` if a previous key was replaced;
      the second value is the index at which the marker was added.
    code_samples: []
    parameters:
      - name: key
        type: RotationCurveKey
        default:
        summary: |
          `Datatype.RotationCurveKey` to insert.
    returns:
      - type: Array
        summary: |
          (see description) .
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:RemoveKeyAtIndex
    summary: |
      Removes a given number of keys starting from a given index.
    description: |
      Removes a given number (`count`) of keys starting from the `startingIndex`
      index and returns the number of keys that were removed.
    code_samples: []
    parameters:
      - name: startingIndex
        type: int
        default:
        summary: |
          Starting index from which to remove keys.
      - name: count
        type: int
        default: 1
        summary: |
          Number of keys to remove.
    returns:
      - type: int
        summary: |
          Number of keys removed.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
  - name: RotationCurve:SetKeys
    summary: |
      Resets this curve's keys using the `Datatype.RotationCurveKey` array
      passed as an argument.
    description: |
      Resets this curve's keys using the `Datatype.RotationCurveKey` array
      passed as an argument. Keys in the `keys` array are sorted in ascending
      time order before insertion, and keys at duplicated times are removed in a
      stable manner.

      Returns the number of keys actually inserted. Keys previously stored in
      this curve are removed before the keys passed as arguments are added.
    code_samples: []
    parameters:
      - name: keys
        type: Array
        default:
        summary: |
          Array of `Datatype.RotationCurveKey|RotationCurveKeys`.
    returns:
      - type: int
        summary: |
          Number of keys inserted.
    tags: []
    deprecation_message: ''
    security: None
    thread_safety: Unsafe
    capabilities:
      - Basic
events: []
callbacks: []