SampledPositionProperty

new Cesium.SampledPositionProperty(referenceFrame, numberOfDerivatives)
DataSources/SampledPositionProperty.js 35

A SampledProperty which is also a PositionProperty.
Name Type Default Description
referenceFrame ReferenceFrame ReferenceFrame.FIXED optional The reference frame in which the position is defined.
numberOfDerivatives Number 0 optional The number of derivatives that accompany each position; i.e. velocity, acceleration, etc...

Members

backwardExtrapolationDuration : Number
DataSources/SampledPositionProperty.js 183

Gets or sets the amount of time to extrapolate backward before the property becomes undefined. A value of 0 will extrapolate forever.
Default Value: 0

backwardExtrapolationType : ExtrapolationType
DataSources/SampledPositionProperty.js 168

Gets or sets the type of extrapolation to perform when a value is requested at a time before any available samples.
Default Value: ExtrapolationType.NONE

readonlydefinitionChanged : Event
DataSources/SampledPositionProperty.js 79

Gets the event that is raised whenever the definition of this property changes. The definition is considered to have changed if a call to getValue would return a different result for the same time.

forwardExtrapolationDuration : Number
DataSources/SampledPositionProperty.js 153

Gets or sets the amount of time to extrapolate forward before the property becomes undefined. A value of 0 will extrapolate forever.
Default Value: 0

forwardExtrapolationType : ExtrapolationType
DataSources/SampledPositionProperty.js 138

Gets or sets the type of extrapolation to perform when a value is requested at a time after any available samples.
Default Value: ExtrapolationType.NONE

interpolationAlgorithm : InterpolationAlgorithm
DataSources/SampledPositionProperty.js 114

Gets the interpolation algorithm to use when retrieving a value.
Default Value: LinearApproximation

interpolationDegree : Number
DataSources/SampledPositionProperty.js 102

Gets the degree of interpolation to perform when retrieving a value.
Default Value: 1

readonlyisConstant : Boolean
DataSources/SampledPositionProperty.js 65

Gets a value indicating if this property is constant. A property is considered constant if getValue always returns the same result for the current definition.

numberOfDerivatives : Boolean
DataSources/SampledPositionProperty.js 126

The number of derivatives contained by this property; i.e. 0 for just position, 1 for velocity, etc.
Default Value: false

referenceFrame : ReferenceFrame
DataSources/SampledPositionProperty.js 90

Gets the reference frame in which the position is defined.
Default Value: ReferenceFrame.FIXED;

Methods

addSample(time, position, derivatives)
DataSources/SampledPositionProperty.js 247

Adds a new sample.
Name Type Description
time JulianDate The sample time.
position Cartesian3 The position at the provided time.
derivatives Array.<Cartesian3> optional The array of derivative values at the provided time.

addSamples(times, positions, derivatives)
DataSources/SampledPositionProperty.js 266

Adds multiple samples via parallel arrays.
Name Type Description
times Array.<JulianDate> An array of JulianDate instances where each index is a sample time.
positions Array.<Cartesian3> An array of Cartesian3 position instances, where each value corresponds to the provided time index.
derivatives Array.<Array> optional An array where each value is another array containing derivatives for the corresponding time index.
Throws:

addSamplesPackedArray(packedSamples, epoch)
DataSources/SampledPositionProperty.js 277

Adds samples as a single packed array where each new sample is represented as a date, followed by the packed representation of the corresponding value and derivatives.
Name Type Description
packedSamples Array.<Number> The array of packed samples.
epoch JulianDate optional If any of the dates in packedSamples are numbers, they are considered an offset from this epoch, in seconds.

equals(other) → Boolean
DataSources/SampledPositionProperty.js 288

Compares this property to the provided property and returns true if they are equal, false otherwise.
Name Type Description
other Property optional The other property.
Returns:
true if left and right are equal, false otherwise.

getValue(time, result) → Cartesian3
DataSources/SampledPositionProperty.js 200

Gets the position at the provided time.
Name Type Description
time JulianDate The time for which to retrieve the value.
result Cartesian3 optional The object to store the value into, if omitted, a new instance is created and returned.
Returns:
The modified result parameter or a new instance if the result parameter was not supplied.

getValueInReferenceFrame(time, referenceFrame, result) → Cartesian3
DataSources/SampledPositionProperty.js 212

Gets the position at the provided time and in the provided reference frame.
Name Type Description
time JulianDate The time for which to retrieve the value.
referenceFrame ReferenceFrame The desired referenceFrame of the result.
result Cartesian3 optional The object to store the value into, if omitted, a new instance is created and returned.
Returns:
The modified result parameter or a new instance if the result parameter was not supplied.

setInterpolationOptions(options)
DataSources/SampledPositionProperty.js 236

Sets the algorithm and degree to use when interpolating a position.
Name Type Description
options Object optional Object with the following properties:
Name Type Description
interpolationAlgorithm InterpolationAlgorithm optional The new interpolation algorithm. If undefined, the existing property will be unchanged.
interpolationDegree Number optional The new interpolation degree. If undefined, the existing property will be unchanged.