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Timer.js
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220 lines (149 loc) · 3.34 KB
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const MILLISECONDS_TO_SECONDS = 1.0 / 1e3;
const SECONDS_TO_MILLISECONDS = 1e3;
/**
* A timer.
*
* Original implementation by Michael Herzog (Mugen87).
*
* @experimental Temporary substitute for {@link https://github.com/mrdoob/three.js/pull/17912}
* @implements {ImmutableTimer}
* @implements {EventListenerObject}
* @implements {Disposable}
*/
export class Timer {
/**
* Constructs a new timer.
*/
constructor() {
/**
* The start time in milliseconds.
*
* @type {Number}
* @private
*/
this.startTime = performance.now();
/**
* The previous time in milliseconds.
*
* @type {Number}
* @private
*/
this.previousTime = 0;
/**
* The current time in milliseconds.
*
* @type {Number}
* @private
*/
this.currentTime = 0;
/**
* The most recent delta time in milliseconds.
*
* @type {Number}
* @private
* @see {@link delta}
*/
this._delta = 0;
/**
* The total elapsed time in milliseconds.
*
* @type {Number}
* @private
* @see {@link elapsed}
*/
this._elapsed = 0;
/**
* The fixed time step in milliseconds. Default is 16.667 (60 fps).
*
* @type {Number}
* @private
* @see {@link fixedDelta}
*/
this._fixedDelta = 1000.0 / 60.0;
/**
* The timescale.
*
* @type {Number}
*/
this.timescale = 1.0;
/**
* Determines whether this timer should use a fixed time step.
*
* @type {Boolean}
*/
this.useFixedDelta = false;
/**
* @type {Boolean}
* @private
* @see {@link autoReset}
*/
this._autoReset = false;
}
/**
* Enables or disables auto reset based on page visibility.
*
* If enabled, the timer will be reset when the page becomes visible. This effectively pauses the timer when the page
* is hidden. Has no effect if the API is not supported.
*
* @type {Boolean}
* @see https://developer.mozilla.org/en-US/docs/Web/API/Page_Visibility_API
*/
get autoReset() {
return this._autoReset;
}
set autoReset(value) {
if(typeof document !== "undefined" && document.hidden !== undefined) {
if(value) {
document.addEventListener("visibilitychange", this);
} else {
document.removeEventListener("visibilitychange", this);
}
this._autoReset = value;
}
}
get delta() {
return this._delta * MILLISECONDS_TO_SECONDS;
}
get fixedDelta() {
return this._fixedDelta * MILLISECONDS_TO_SECONDS;
}
set fixedDelta(value) {
this._fixedDelta = value * SECONDS_TO_MILLISECONDS;
}
get elapsed() {
return this._elapsed * MILLISECONDS_TO_SECONDS;
}
/**
* Updates this timer.
*
* @param {Boolean} [timestamp] - The current time in milliseconds.
*/
update(timestamp) {
if(this.useFixedDelta) {
this._delta = this.fixedDelta;
} else {
this.previousTime = this.currentTime;
this.currentTime = ((timestamp !== undefined) ? timestamp : performance.now()) - this.startTime;
this._delta = this.currentTime - this.previousTime;
}
this._delta *= this.timescale;
this._elapsed += this._delta;
}
/**
* Resets this timer.
*/
reset() {
this._delta = 0;
this._elapsed = 0;
this.currentTime = performance.now() - this.startTime;
}
handleEvent(e) {
if(!document.hidden) {
// Reset the current time.
this.currentTime = performance.now() - this.startTime;
}
}
dispose() {
this.autoReset = false;
}
}