Clock
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new Cesium.Clock(options)
engine/Source/Core/Clock.js 43

A simple clock for keeping track of simulated time.
参数名称 类型 描述信息
options object 可选 Object with the following properties:
参数名称 类型 默认值 描述信息
startTime JulianDate 可选 The start time of the clock.
stopTime JulianDate 可选 The stop time of the clock.
currentTime JulianDate 可选 The current time.
multiplier number 1.0 可选 Determines how much time advances when Clock#tick is called, negative values allow for advancing backwards.
clockStep ClockStep ClockStep.SYSTEM_CLOCK_MULTIPLIER 可选 Determines if calls to Clock#tick are frame dependent or system clock dependent.
clockRange ClockRange ClockRange.UNBOUNDED 可选 Determines how the clock should behave when Clock#startTime or Clock#stopTime is reached.
canAnimate boolean true 可选 Indicates whether Clock#tick can advance time. This could be false if data is being buffered, for example. The clock will only tick when both Clock#canAnimate and Clock#shouldAnimate are true.
shouldAnimate boolean false 可选 Indicates whether Clock#tick should attempt to advance time. The clock will only tick when both Clock#canAnimate and Clock#shouldAnimate are true.
Throws:
使用示例:
// Create a clock that loops on Christmas day 2013 and runs in real-time.
const clock = new Cesium.Clock({
   startTime : Cesium.JulianDate.fromIso8601("2013-12-25"),
   currentTime : Cesium.JulianDate.fromIso8601("2013-12-25"),
   stopTime : Cesium.JulianDate.fromIso8601("2013-12-26"),
   clockRange : Cesium.ClockRange.LOOP_STOP,
   clockStep : Cesium.ClockStep.SYSTEM_CLOCK_MULTIPLIER
});
参考:

成员(属性)

canAnimate : boolean
engine/Source/Core/Clock.js 115

Indicates whether Clock#tick can advance time. This could be false if data is being buffered, for example. The clock will only advance time when both Clock#canAnimate and Clock#shouldAnimate are true.
默认值: true

clockRange : ClockRange
engine/Source/Core/Clock.js 106

Determines how the clock should behave when Clock#startTime or Clock#stopTime is reached.
默认值: ClockRange.UNBOUNDED

clockStep : ClockStep
engine/Source/Core/Clock.js 210

Determines if calls to Clock#tick are frame dependent or system clock dependent. Changing this property to ClockStep.SYSTEM_CLOCK will set Clock#multiplier to 1.0, Clock#shouldAnimate to true, and Clock#currentTime to the current system clock time.
默认值: ClockStep.SYSTEM_CLOCK_MULTIPLIER

currentTime : JulianDate
engine/Source/Core/Clock.js 155

The current time. Changing this property will change Clock#clockStep from ClockStep.SYSTEM_CLOCK to ClockStep.SYSTEM_CLOCK_MULTIPLIER.

multiplier : number
engine/Source/Core/Clock.js 184

Gets or sets how much time advances when Clock#tick is called. Negative values allow for advancing backwards. If Clock#clockStep is set to ClockStep.TICK_DEPENDENT, this is the number of seconds to advance. If Clock#clockStep is set to ClockStep.SYSTEM_CLOCK_MULTIPLIER, this value is multiplied by the elapsed system time since the last call to Clock#tick. Changing this property will change Clock#clockStep from ClockStep.SYSTEM_CLOCK to ClockStep.SYSTEM_CLOCK_MULTIPLIER.
默认值: 1.0

onStop : Event
engine/Source/Core/Clock.js 126

An Event that is fired whenever Clock#stopTime is reached.

onTick : Event
engine/Source/Core/Clock.js 121

An Event that is fired whenever Clock#tick is called.

shouldAnimate : boolean
engine/Source/Core/Clock.js 236

Indicates whether Clock#tick should attempt to advance time. The clock will only advance time when both Clock#canAnimate and Clock#shouldAnimate are true. Changing this property will change Clock#clockStep from ClockStep.SYSTEM_CLOCK to ClockStep.SYSTEM_CLOCK_MULTIPLIER.
默认值: false

startTime : JulianDate
engine/Source/Core/Clock.js 91

The start time of the clock.

stopTime : JulianDate
engine/Source/Core/Clock.js 97

The stop time of the clock.

方法

tick() → JulianDate
engine/Source/Core/Clock.js 261

Advances the clock from the current time based on the current configuration options. tick should be called every frame, regardless of whether animation is taking place or not. To control animation, use the Clock#shouldAnimate property.
返回值:
The new value of the Clock#currentTime property.
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