A
SampledProperty which is also a PositionProperty.
| 参数名称 | 类型 | 默认值 | 描述信息 |
|---|---|---|---|
referenceFrame |
ReferenceFrame |
ReferenceFrame.FIXED
|
可选 The reference frame in which the position is defined. |
numberOfDerivatives |
number |
0
|
可选 The number of derivatives that accompany each position; i.e. velocity, acceleration, etc... |
成员(属性)
Gets or sets the amount of time to extrapolate backward
before the property becomes undefined. A value of 0 will extrapolate forever.
-
默认值:
0
backwardExtrapolationType : ExtrapolationType
Gets or sets the type of extrapolation to perform when a value
is requested at a time before any available samples.
-
默认值:
ExtrapolationType.NONE
readonly definitionChanged : Event
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.
Gets or sets the amount of time to extrapolate forward before
the property becomes undefined. A value of 0 will extrapolate forever.
-
默认值:
0
forwardExtrapolationType : ExtrapolationType
Gets or sets the type of extrapolation to perform when a value
is requested at a time after any available samples.
-
默认值:
ExtrapolationType.NONE
readonly interpolationAlgorithm : InterpolationAlgorithm
Gets the interpolation algorithm to use when retrieving a value. Call
setInterpolationOptions to set this.
-
默认值:
LinearApproximation
Gets the degree of interpolation to perform when retrieving a value. Call
setInterpolationOptions to set this.
-
默认值:
1
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.
The number of derivatives contained by this property; i.e. 0 for just position, 1 for velocity, etc.
-
默认值:
0
referenceFrame : ReferenceFrame
Gets the reference frame in which the position is defined.
-
默认值:
ReferenceFrame.FIXED;
方法
Adds a new sample.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
time |
JulianDate | The sample time. |
position |
Cartesian3 | The position at the provided time. |
derivatives |
Array.<Cartesian3> | 可选 The array of derivative values at the provided time. |
Adds multiple samples via parallel arrays.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
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> | 可选 An array where each value is another array containing derivatives for the corresponding time index. |
Throws:
-
DeveloperError : All arrays must be the same length.
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.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
packedSamples |
Array.<number> | The array of packed samples. |
epoch |
JulianDate | 可选 If any of the dates in packedSamples are numbers, they are considered an offset from this epoch, in seconds. |
Compares this property to the provided property and returns
true if they are equal, false otherwise.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
other |
Property | 可选 The other property. |
返回值:
true if left and right are equal, false otherwise.
getValue(time, result) → Cartesian3|undefined
Gets the position at the provided time.
| 参数名称 | 类型 | 默认值 | 描述信息 |
|---|---|---|---|
time |
JulianDate |
JulianDate.now()
|
可选 The time for which to retrieve the value. If omitted, the current system time is used. |
result |
Cartesian3 | 可选 The object to store the value into, if omitted, a new instance is created and returned. |
返回值:
The modified result parameter or a new instance if the result parameter was not supplied.
getValueInReferenceFrame(time, referenceFrame, result) → Cartesian3|undefined
Gets the position at the provided time and in the provided reference frame.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
time |
JulianDate | The time for which to retrieve the value. |
referenceFrame |
ReferenceFrame | The desired referenceFrame of the result. |
result |
Cartesian3 | 可选 The object to store the value into, if omitted, a new instance is created and returned. |
返回值:
The modified result parameter or a new instance if the result parameter was not supplied.
Removes a sample at the given time, if present.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
time |
JulianDate | The sample time. |
返回值:
true if a sample at time was removed, false otherwise.
Removes all samples for the given time interval.
| 参数名称 | 类型 | 描述信息 |
|---|---|---|
time |
TimeInterval | The time interval for which to remove all samples. |
Sets the algorithm and degree to use when interpolating a position.
| 参数名称 | 类型 | 描述信息 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
options |
object |
可选
Object with the following properties:
|