CallbackPositionProperty
查阅Mars3D API

new Cesium.CallbackPositionProperty(callback, isConstant, referenceFrame)
engine/Source/DataSources/CallbackPositionProperty.js 21

A PositionProperty whose value is lazily evaluated by a callback function.
参数名称 类型 默认值 描述信息
callback CallbackPositionProperty.Callback The function to be called when the position property is evaluated.
isConstant boolean true when the callback function returns the same value every time, false if the value will change.
referenceFrame ReferenceFrame ReferenceFrame.FIXED 可选 The reference frame in which the position is defined.
Demo:

成员(属性)

readonly definitionChanged : Event
engine/Source/DataSources/CallbackPositionProperty.js 51

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.

readonly isConstant : boolean
engine/Source/DataSources/CallbackPositionProperty.js 37

Gets a value indicating if this property is constant.

referenceFrame : ReferenceFrame
engine/Source/DataSources/CallbackPositionProperty.js 62

Gets the reference frame in which the position is defined.
默认值: ReferenceFrame.FIXED;

方法

equals(other) → boolean
engine/Source/DataSources/CallbackPositionProperty.js 155

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
engine/Source/DataSources/CallbackPositionProperty.js 78

Gets the value of the property at the provided time in the fixed frame.
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
engine/Source/DataSources/CallbackPositionProperty.js 123

Gets the value of the property 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.

setCallback(callback, isConstant)
engine/Source/DataSources/CallbackPositionProperty.js 91

Sets the callback to be used.
参数名称 类型 描述信息
callback CallbackPositionProperty.Callback The function to be called when the property is evaluated.
isConstant boolean true when the callback function returns the same value every time, false if the value will change.

定义的类型

Cesium.CallbackPositionProperty.Callback(time, result) → Cartesian3|undefined
engine/Source/DataSources/CallbackPositionProperty.js 165

A function that returns the value of the position property.
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, the function must create and return a new instance.
返回值:
The modified result parameter, or a new instance if the result parameter was not supplied or is unsupported.
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