@smoud/tiny/src/app/RAF.js

Fast and tiny JavaScript library for HTML5 game and playable ads creation.

var _isSetTimeOut, _onLoop, _timeOutID, _prevTime, _lastTime;

var now = function () {
    return new Date().getTime();
};

if (self.performance !== undefined && self.performance.now !== undefined) {
    now = self.performance.now.bind(self.performance);
} else if (Date.now !== undefined) {
    now = Date.now;
}

var RAF = function (game, forceSetTimeOut) {
    if (forceSetTimeOut === undefined) {
        forceSetTimeOut = false;
    }
    this.game = game;

    this.isRunning = false;
    this.forceSetTimeOut = forceSetTimeOut;

    var vendors = ['ms', 'moz', 'webkit', 'o'];

    for (var x = 0; x < vendors.length && !window.requestAnimationFrame; x++) {
        window.requestAnimationFrame = window[vendors[x] + 'RequestAnimationFrame'];
        window.cancelAnimationFrame =
            window[vendors[x] + 'CancelAnimationFrame'] || window[vendors[x] + 'CancelRequestAnimationFrame'];
    }

    _isSetTimeOut = false;
    _onLoop = null;
    _timeOutID = null;

    _prevTime = 0;
    _lastTime = 0;
};

RAF.prototype = {
    start: function () {
        _prevTime = now();

        this.isRunning = true;

        var _this = this;

        if (!window.requestAnimationFrame || this.forceSetTimeOut) {
            _isSetTimeOut = true;

            _onLoop = function () {
                return _this.updateSetTimeout();
            };

            _timeOutID = window.setTimeout(_onLoop, 0);
        } else {
            _isSetTimeOut = false;

            _onLoop = function () {
                return _this.updateRAF();
            };

            _timeOutID = window.requestAnimationFrame(_onLoop);
        }
    },

    updateRAF: function () {
        _lastTime = now();

        if (this.isRunning) {
            this.game._update(Math.floor(_lastTime), _lastTime - _prevTime);

            _timeOutID = window.requestAnimationFrame(_onLoop);
        }

        _prevTime = _lastTime;
    },

    updateSetTimeout: function () {
        _lastTime = now();
        if (this.isRunning) {
            this.game._update(Math.floor(_lastTime), _lastTime - _prevTime);

            _timeOutID = window.setTimeout(_onLoop, RAF.timeToCall);
        }
        _prevTime = _lastTime;
    },

    reset: function () {
        _prevTime = now();
    },

    stop: function () {
        if (_isSetTimeOut) {
            clearTimeout(_timeOutID);
        } else {
            window.cancelAnimationFrame(_timeOutID);
        }

        this.isRunning = false;
    }
};

RAF.timeToCall = 15;

export { RAF };