toosoon-utils/lib/extras/frame-rate/FrameRate.js

Utility functions & classes

import { now } from '../../functions';
/**
 * Utility class for controlling FPS calls
 *
 * @exports
 * @class FrameRate
 */
export default class FrameRate {
    _fps;
    _interval = 0;
    _time = 0;
    _elapsedTime = 0;
    _lastUpdate = 0;
    /**
     * @param {number} [fps=30] Frame per second limit
     */
    constructor(fps = 30) {
        this.fps = fps;
    }
    /**
     * Return true if elapsed time since last update is higher than current FPS
     *
     * @returns {boolean}
     */
    update() {
        this._time = now();
        this._elapsedTime = this._time - this._lastUpdate;
        if (this._elapsedTime < this._interval) {
            return false;
        }
        this._lastUpdate = this._time - (this._elapsedTime % this._interval);
        return true;
    }
    get fps() {
        return this._fps;
    }
    set fps(fps) {
        this._fps = fps;
        this._interval = 1000 / fps;
    }
}