QuaternionSpline

new Cesium.QuaternionSpline(options)
engine/Source/Core/QuaternionSpline.js 52

A spline that uses spherical linear (slerp) interpolation to create a quaternion curve. The generated curve is in the class C1.
Name Type Description
options object Object with the following properties:
Name Type Description
times Array.<number> An array of strictly increasing, unit-less, floating-point times at each point. The values are in no way connected to the clock time. They are the parameterization for the curve.
points Array.<Quaternion> The array of Quaternion control points.
Throws:
See:

Members

readonly points : Array.<Quaternion>
engine/Source/Core/QuaternionSpline.js 102

An array of Quaternion control points.

readonly times : Array.<number>
engine/Source/Core/QuaternionSpline.js 88

An array of times for the control points.

Methods

clampTime(time) → number
engine/Source/Core/QuaternionSpline.js 139

Clamps the given time to the period covered by the spline.
Name Type Description
time number The time.
Returns:
The time, clamped to the animation period.

evaluate(time, result) → Quaternion
engine/Source/Core/QuaternionSpline.js 152

Evaluates the curve at a given time.
Name Type Description
time number The time at which to evaluate the curve.
result Quaternion optional The object onto which to store the result.
Returns:
The modified result parameter or a new instance of the point on the curve at the given time.
Throws:
  • DeveloperError : time must be in the range [t0, tn], where t0 is the first element in the array times and tn is the last element in the array times.

findTimeInterval(time) → number
engine/Source/Core/QuaternionSpline.js 121

Finds an index i in times such that the parameter time is in the interval [times[i], times[i + 1]].
Name Type Description
time number The time.
Returns:
The index for the element at the start of the interval.
Throws:
  • DeveloperError : time must be in the range [t0, tn], where t0 is the first element in the array times and tn is the last element in the array times.

wrapTime(time) → number
engine/Source/Core/QuaternionSpline.js 130

Wraps the given time to the period covered by the spline.
Name Type Description
time number The time.
Returns:
The time, wrapped around to the updated animation.
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