Samoiloff Blog

AS 3.0 Library. Actions Sequence. February 1, 2010

In game development it’s usual to play around with queue of commands (tasks or actions). In order to handle those queues I developed two very simple classes (actually just one of them contains logic). They are very easy to use and they are very flexible since they contain a few code. All you need to do is to extend the ActionItem class.
The code that I wrote for an example is just of 2 small classes:
1. The Document one:

public class ActionsExample extends MovieClip {
private var _bg:RectMc;
private var _target:RectMc;
private var _actionsItem:ActionsItem;
public var numTf:TextField;
public var xTf:TextField;
public var yTf:TextField;
public function ActionsExample() {
_bg = new RectMc();
addChild(_bg);
_bg.alpha = 0;
_target = new RectMc();
addChild(_target);
_actionsItem = new ActionsItem();
stage.addEventListener(MouseEvent.CLICK, onClick);
stage.addEventListener(Event.RESIZE, onStageResize);
_actionsItem.addEventListener(ActionItem.ACTION_COMPLETE, onActionComplete);
onStageResize();
updateInfo();
}
private function onActionComplete(e:Event):void {
updateInfo();
}
private function onClick(e:MouseEvent):void {
_actionsItem.addAction(new MoveAction(stage.mouseX, stage.mouseY, _target));
_actionsItem.start();
updateInfo();
}
private function updateInfo():void {
numTf.text = _actionsItem.length.toString();
if (_actionsItem.length) {
var moveAction:MoveAction = MoveAction(_actionsItem.getItemAt(0));
xTf.text = moveAction.x.toString();
yTf.text = moveAction.y.toString();
} else {
xTf.text = yTf.text = '';
}
}
private function onStageResize(e:Event = null ):void {
_bg.width = stage.stageWidth;
_bg.height = stage.stageHeight;
}
}


2. The MoveAction class that extends ActionItem:

public class MoveAction extends ActionItem
{
private var _x:Number;
private var _y:Number;
private var _target:DisplayObject;
public function MoveAction(x:Number, y:Number, target:DisplayObject) {
_x = x;
_y = y;
_target = target;
}
public function get x():Number {
return _x;
}
public function get y(): Number {
return _y;
}
override public function start():void {
super.start();
Tweener.addTween(_target, { x:_x, y:_y, time:1, transition:"easeOutCubic", onComplete:onTweenComplete} );
}
private function onTweenComplete():void {
finish();
}
override public function destroy():void {
_target = null;
}
}


Here are the sources.