CODEWITHSUNDEEP
actionscript-3flasheffects
deathwillcome800
deathwillcome800

Reputation: 51

AS3 - Make the screen flash for half a second

What I want to do is:

After colliding with an [object], I want the screen to flash for about half of a second. I have tried for loops and while loops but they seem to not work. I have no idea how I should program this.

I've been trying to figure out how to do this since I'v been making the game so it would be helpful if someone could help me.

Thank you for reading.

Upvotes: 1

Views: 135

Answers (1)

BadFeelingAboutThis
BadFeelingAboutThis

Reputation: 14406

You need to use something that involves time. loops all run in a thread which doesn't pause for time - which is why they don't work.

Here is how you could do this with an AS3 Timer (let's say this code runs right after you've determined there's been a collision)

function flashScreen():void {
    var timer:Timer = new Timer(50, 10); //run the timer every 50 milliseconds, 10 times (eg the whole timer will run for half a second giving you a tick 10 times)

    var flash:Shape = new Shape(); //a white rectangle to cover the whole screen.
    flash.graphics.beginFill(0xFFFFFF);
    flash.graphics.drawRect(0,0,stage.stageWidth,stage.stageHeight);
    flash.visible = false;
    stage.addChild(flash);

    timer.addEventListener(TimerEvent.TIMER, function(e:TimerEvent):void {
        //we've told AS3 to run this every 50 milliseconds

        flash.visible = !flash.visible; //toggle visibility
        //if(Timer(e.currentTarget).currentCount % 2 == 0){ } //or you could use this as a fancy way to do something every other tick
    });

    timer.addEventListener(TimerEvent.TIMER_COMPLETE, function(e:TimerEvent):void {
        //the timer has run 10 times, let's stop this flashing madness.
        stage.removeChild(flash);
    });

    timer.start();
}

Other ways you can do this are with setInterval, setTimeout, a Tweening library,and an ENTER_FRAME event handler.

Upvotes: 1

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