8 AS3 Snippets

I was going to create a “top 10” list for 2008, but I’d like to make sure I remember to post this…so here are 8 snippets of simple ActionScript 3 code – nothing earth-shattering (especially to an expert), but items I find myself looking up all the time.

 

1.       Disable/enable a button component

myButton.enabled = true;

 

2.       Creating a mask
mc1.mask = mc2;

 

3.       Create a rounded rectangle

// http://www.kirupa.com/forum/showthread.php?p=1878656

var square:Sprite = new Sprite();

square.graphics.beginFill(0xFF);

square.graphics.drawRoundRect(0, 0, 100, 50, 10, 10);

square.graphics.endFill();

addChild(square);

 

4.       Custom cursor

// http://www.eclips3media.com/workshop/2007/12/11/custom-cursor-bug-in-actionscript3/

var hoverMagnify:mcMagnify = new mcMagnify();

hoverMagnify.mouseEnabled = false;

addChild(hoverMagnify)

function mouseMoveHandler(evt:MouseEvent):void {

                // whenever the mouse moves, place the cursor in the same spot

                hoverMagnify.x = mouseX + 1;

                hoverMagnify.y = mouseY + 1;

}

 

5.       Add a sound, and control its volume
var soundBg:Sound = new audioWinterWonderland();

var sc:SoundChannel = soundBg.play(0,999999); // repeat sound 999,999 times

var st:SoundTransform = sc.soundTransform;

st.volume = 1; // set to full volume

 

function changeVolume(): void {

Tweener.addTween(st, {volume:.1, onUpdate:updateChannel, time:1});

}

function updateChannel():void{

                sc.soundTransform = st;

}

 

6.       Loading an asset from a SWF

 [Embed(source="Assets.swf", symbol="MySymbol")]  

var mcClass:Class;

var myMC:MovieClip = new mcClass();

addChild(myMC);

// Note: Per this great blog entry, the default type will be a sprite unless there are two frames on the timeline.

 

7.       Create a timer

var timer:Timer = new Timer(1000, 2);

    timer.addEventListener(TimerEvent.TIMER, blah);

    timer.start();

 

function blah(e:TimerEvent):void{

     trace("Times Fired: " + e.currentTarget.currentCount);

     trace("Time Delayed: " + e.currentTarget.delay);

}

 

8.       Detect if one movieclip is over another

//As the D-mode blog nicely explains:

myMC1.hitTestObject(myMC2);