ConstantSpline
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new Cesium.ConstantSpline(value)
engine/Source/Core/ConstantSpline.js 26

A spline that evaluates to a constant value. Although this follows the Spline interface, it does not maintain an internal array of times since its value never changes.
参数名称 类型 描述信息
value number | Cartesian3 | Quaternion The constant value that the spline evaluates to.
使用示例:
const position = new Cesium.Cartesian3(1.0, 2.0, 3.0);
const spline = new Cesium.ConstantSpline(position);

const p0 = spline.evaluate(0.0);
参考:

成员(属性)

readonly value : number|Cartesian3|Quaternion
engine/Source/Core/ConstantSpline.js 40

The constant value that the spline evaluates to.

方法

clampTime(time) → number
engine/Source/Core/ConstantSpline.js 88

Clamps the given time to the period covered by the spline.
参数名称 类型 描述信息
time number The time.
返回值:
The time, clamped to the animation period.

evaluate(time, result) → number|Cartesian3|Quaternion
engine/Source/Core/ConstantSpline.js 104

Evaluates the curve at a given time.
参数名称 类型 描述信息
time number The time at which to evaluate the curve.
result Cartesian3 | Quaternion 可选 The object onto which to store the result.
返回值:
The modified result parameter or the value that the constant spline represents.

findTimeInterval(time)
engine/Source/Core/ConstantSpline.js 58

Finds an index i in times such that the parameter time is in the interval [times[i], times[i + 1]]. Since a constant spline has no internal times array, this will throw an error.
参数名称 类型 描述信息
time number The time.
Throws:
  • DeveloperError : findTimeInterval cannot be called on a ConstantSpline.

wrapTime(time) → number
engine/Source/Core/ConstantSpline.js 73

Wraps the given time to the period covered by the spline.
参数名称 类型 描述信息
time number The time.
返回值:
The time, wrapped around to the updated animation.
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