# Rotation

#### Rotation()
DataSources/Rotation.js 40

  Represents a `Packable` number that always interpolates values towards the shortest angle of rotation. This object is never used directly but is instead passed to the constructor of `SampledProperty` in order to represent a two-dimensional angle of rotation.

  ##### Example:

      var time1 = Cesium.JulianDate.fromIso8601('2010-05-07T00:00:00');
      var time2 = Cesium.JulianDate.fromIso8601('2010-05-07T00:01:00');
      var time3 = Cesium.JulianDate.fromIso8601('2010-05-07T00:02:00');

      var property = new Cesium.SampledProperty(Cesium.Rotation);
      property.addSample(time1, 0);
      property.addSample(time3, Cesium.Math.toRadians(350));

      //Getting the value at time2 will equal 355 degrees instead
      //of 175 degrees (which is what you get if you construct
      //a SampledProperty(Number) instead.  Note, the actual
      //return value is in radians, not degrees.
      property.getValue(time2);

  ##### See:

  - PackableForInterpolation

### Members

#### staticCesium.Rotation.packedLength : Number
DataSources/Rotation.js 45

  The number of elements used to pack the object into an array.

### Methods

#### staticCesium.Rotation.convertPackedArrayForInterpolation(packedArray, startingIndex, lastIndex, result)
DataSources/Rotation.js 96

  Converts a packed array into a form suitable for interpolation.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `packedArray` | Array.<Number> |  | The packed array.
  `startingIndex` | Number | `0` | optional The index of the first element to be converted.
  `lastIndex` | Number | `packedArray.length` | optional The index of the last element to be converted.
  `result` | Array.<Number> |  | The object into which to store the result.

#### staticCesium.Rotation.pack(value, array, startingIndex)
DataSources/Rotation.js 54

  Stores the provided instance into the provided array.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `value` | Rotation |  | The value to pack.
  `array` | Array.<Number> |  | The array to pack into.
  `startingIndex` | Number | `0` | optional The index into the array at which to start packing the elements.

#### staticCesium.Rotation.unpack(array, startingIndex, result) → Rotation
DataSources/Rotation.js 77

  Retrieves an instance from a packed array.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `array` | Array.<Number> |  | The packed array.
  `startingIndex` | Number | `0` | optional The starting index of the element to be unpacked.
  `result` | Rotation |  | optional The object into which to store the result.

  ##### Returns:

  The modified result parameter or a new Rotation instance if one was not provided.

#### staticCesium.Rotation.unpackInterpolationResult(array, sourceArray, startingIndex, lastIndex, result) → Rotation
DataSources/Rotation.js 128

  Retrieves an instance from a packed array converted with `Rotation.convertPackedArrayForInterpolation`.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `array` | Array.<Number> |  | The array previously packed for interpolation.
  `sourceArray` | Array.<Number> |  | The original packed array.
  `startingIndex` | Number | `0` | optional The startingIndex used to convert the array.
  `lastIndex` | Number | `packedArray.length` | optional The lastIndex used to convert the array.
  `result` | Rotation |  | optional The object into which to store the result.

  ##### Returns:

  The modified result parameter or a new Rotation instance if one was not provided.