/**

* @author alteredq / http://alteredqualia.com/

*/

function Clock( autoStart ) {

this.autoStart = ( autoStart !== undefined ) ? autoStart : true;

this.startTime = 0;

this.oldTime = 0;

this.elapsedTime = 0;

this.running = false;

}

Clock.prototype = {

constructor: Clock,

start: function () {

this.startTime = ( performance || Date ).now();

this.oldTime = this.startTime;

this.elapsedTime = 0;

this.running = true;

},

stop: function () {

this.getElapsedTime();

this.running = false;

},

getElapsedTime: function () {

this.getDelta();

return this.elapsedTime;

},

getDelta: function () {

var diff = 0;

if ( this.autoStart && ! this.running ) {

this.start();

}

if ( this.running ) {

var newTime = ( performance || Date ).now();

diff = ( newTime - this.oldTime ) / 1000;

this.oldTime = newTime;

this.elapsedTime += diff;

}

return diff;

}

};

export { Clock };