flashpunk LinearMotion usage

幾個地方要注意
// auto remove when it has finished
var myTween = new LinearMotion(null, Tween.ONESHOT);

// auto stop and run myComplete when is has finished
var myTween = new LinearMotion(myComplete);

myTween.setMotion(to_x, 340, to_x, 300, 0.5, Ease.quadOut);

// don't start immediately
addTween(myTween, false);

you can check myTween.active in update().
完整範例如下：

	package
	{
	import net.flashpunk.Entity;
	import net.flashpunk.FP;
	import net.flashpunk.graphics.BitmapFont;
	import net.flashpunk.graphics.BitmapText;
	import net.flashpunk.graphics.Text;
	import net.flashpunk.Tween;
	import net.flashpunk.tweens.motion.LinearMotion;
	import net.flashpunk.utils.Ease;
	public class MotionScore extends Entity
	{
	protected var text_score:Text;
	private var myTween:LinearMotion;
	private var to_x:Number;
	private var currText:String;
	public function MotionScore()
	{
	currText = "";
	to_x = FP.halfWidth - 50;
	x = to_x;
	y = 340;
	text_score = new Text("", 0, 0, { color:0xFF0000, size:26, align:"center" }, 25);
	graphic = text_score;
	// auto remove when it has finished.
	//myTween = new LinearMotion(null, Tween.ONESHOT);
	myTween = new LinearMotion(myComplete);
	myTween.setMotion(to_x, 340, to_x, 300, 0.5, Ease.quadOut);
	addTween(myTween, false);
	}
	public function playTween():void
	{
	myTween.start();
	text_score.visible = true;
	}
	private function myComplete():void
	{
	myTween.active = false;
	text_score.visible = false;
	x = to_x;
	y = 340;
	}
	override public function update():void {
	if (myTween.active) {
	// setting x,y position
	x = myTween.x;
	y = myTween.y;
	text_score.text = currText;
	return;
	}
	if (Main.showscore.length > 0) {
	currText = "+" + Main.showscore.shift();
	playTween();
	}
	}
	}
	}

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