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87 lines
2.6 KiB
87 lines
2.6 KiB
3 years ago
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<!DOCTYPE html>
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<html lang="zh">
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<head>
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<meta charset="utf-8" />
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<base href="../../../" />
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<script src="page.js"></script>
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<link type="text/css" rel="stylesheet" href="page.css" />
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</head>
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<body>
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<h1>[name]</h1>
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<p class="desc">
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该对象用于跟踪时间。如果[link:https://developer.mozilla.org/en-US/docs/Web/API/Performance/now performance.now]可用，则
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Clock 对象通过该方法实现，否则回落到使用略欠精准的[link:https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/now Date.now]来实现。
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</p>
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<h2>构造函数</h2>
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<h3>[name]( [param:Boolean autoStart] )</h3>
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<p>
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autoStart — (可选) 是否要在第一次调用 [page:.getDelta]() 时自动开启时钟。默认值是 *true*。
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</p>
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<h2>属性</h2>
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<h3>[property:Boolean autoStart]</h3>
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<p>
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如果设置为 true，则在第一次调用 [page:.getDelta]() 时开启时钟。默认值是 *true*。
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</p>
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<h3>[property:Float startTime]</h3>
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<p>
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存储时钟最后一次调用 [page:Clock.start start] 方法的时间。默认值是 *0*。
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</p>
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<h3>[property:Float oldTime]</h3>
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<p>
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存储时钟最后一次调用 [page:Clock.start start], [page:.getElapsedTime]() 或 [page:.getDelta]() 方法的时间。默认值是 *0*。
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</p>
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<h3>[property:Float elapsedTime]</h3>
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<p>
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保存时钟运行的总时长。默认值是 *0*。
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</p>
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<h3>[property:Boolean running]</h3>
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<p>
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判断时钟是否在运行。默认值是 *false*。
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</p>
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<h2>方法</h2>
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<h3>[method:undefined start]()</h3>
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<p>
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启动时钟。同时将 [page:Clock.startTime startTime] 和 [page:Clock.oldTime oldTime] 设置为当前时间。
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设置 [page:Clock.elapsedTime elapsedTime] 为 *0*，并且设置 [page:Clock.running running] 为 *true*.
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</p>
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<h3>[method:undefined stop]()</h3>
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<p>
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停止时钟。同时将 [page:Clock.oldTime oldTime] 设置为当前时间。
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</p>
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<h3>[method:Float getElapsedTime]()</h3>
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<p>
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获取自时钟启动后的秒数，同时将 [page:.oldTime] 设置为当前时间。<br />
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如果 [page:.autoStart] 设置为 *true* 且时钟并未运行，则该方法同时启动时钟。
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</p>
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<h3>[method:Float getDelta]()</h3>
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<p>
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获取自 [page:.oldTime] 设置后到当前的秒数。 同时将 [page:.oldTime] 设置为当前时间。<br/>
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如果 [page:.autoStart] 设置为 *true* 且时钟并未运行，则该方法同时启动时钟。
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</p>
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<h2>源代码</h2>
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<p>
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[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]
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</p>
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</body>
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</html>
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