Countdown Timer in AS3 - actionscript-3

Question

I'm testing the opposite script as a countdown timer, and there's a type error:
TypeError: Error #1034: Type Coercion failed: cannot convert flash.events::Event#33d6b881f29 to flash.events.TimerEvent.
var goalTimerScore: int = Math.floor(Math.random() * 101) + 20;
var Minutes:Number = Math.floor(Math.random() * 11);
var Seconds:Number = Math.floor(Math.random() * 60);
timerMin_txt.text = String(Seconds);
timerSec_txt.text = String(Minutes);
timerWatch.addEventListener(Event.ENTER_FRAME, countTimer);
timerWatch.play();
function countTimer(e:TimerEvent):void {
if (timerWatch.currentFrame == 61) {
Seconds--;
if (Seconds > 59) {
Seconds = 0;
timerSec_txt.text = "0" + Seconds;
Minutes--;
if (Minutes > 10) {
timerMin_txt.text = "" + Minutes;
} else {
timerMin_txt.text = "0" + Minutes;
}
if (Minutes == 0 && Seconds == 0) {
timerWatch.removeEventListener(Event.ENTER_FRAME, countTimer);
timer.stop();
gotoAndPlay("gameover_Hidden3");
return;
}
}
else {
if (Seconds >= 10) {
timerSec_txt.text = "" + Seconds;
} else {
timerSec_txt.text = "0" + Seconds;
}
}
}
}
Any ideas how to solve this?

Answer 1

You have the wrong function parameters, they should be:
function countTimer(e:Event):void {
As a suggestion, running a timer off the frame rate can be pretty inconsistent as it relies on a constant frame rate. Probably better to use a time based approach.
You can use the Timer class for a basic approach. There is an example in the asdocs of a count down.
https://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/utils/Timer.html

Answer 2

function countTimer(e: Event): void {
if (timerWatch.currentFrame == 61) {
Seconds--;
if (Seconds < 0) {
Minutes--;
Seconds = 59;
}
if (Minutes == 0 && Seconds == 0) {
timerWatch.removeEventListener(Event.ENTER_FRAME, countTimer);
timerWatch.stop();
gotoAndPlay("gameover_Hidden3");
return;
}
if (Minutes >= 1 && Seconds == 0) {
if (Minutes == 0) {
timerMin_txt.textColor = 0xFF0000;
timerSec_txt.textColor = 0xFF0000;
}
}
}
if (Seconds < 10) {
timerSec_txt.text = "0" + Seconds;
} else {
timerSec_txt.text = "" + Seconds;
}
if (Minutes < 10) {
timerMin_txt.text = "0" + Minutes;
} else {
timerMin_txt.text = "" + Minutes;
}
}

Answer 3

A crucial thing for timer accuracy is the stage.frameRate property. Without maxing it out, accuracy will be multiples of 60 Hz.
import flash.events.Event;
import flash.events.TimerEvent;
import flash.utils.getTimer;
import flash.utils.Timer;
stage.frameRate = 1000;
const t:Timer = new Timer(0);
t.addEventListener(TimerEvent.TIMER, t_h);
t.delay = 10000; //10 seconds
timestamp = getTimer();
t.start();
public function t_h(e:TimerEvent):void {
trace("countdown complete")
trace(getTimer() - timestamp)
t.stop();
}