// JavaScript Document
// Declaring class "Timer"
var Timer = function() {

    // Property: Frequency of elapse event of the timer in millisecond
    this.Interval = 1000;
    // Property: Whether the timer is enable or not
    this.Enable = new Boolean(false);
    // Event: Timer tick
    this.Tick;
    // Member variable: Hold interval id of the timer
    var timerId = 0;
    // Member variable: Hold instance of this class
    var thisObject;
    
    // Function: Start the timer
    this.Start = function() {
        this.Enable = new Boolean(true);
        thisObject = this;
        if (thisObject.Enable) {
            thisObject.timerId = setInterval(
            function() {
                thisObject.Tick();
            }, thisObject.Interval);
        }
    };

    // Function: Stops the timer
    this.Stop = function() {
        thisObject.Enable = new Boolean(false);
        clearInterval(thisObject.timerId);
    };
};