BetweenAS3でテキストをtweenしてみる

@see http://nondelion.com/archives/2009/09/16/2237

by nondelion 23 Sep 2009

Tags

BetweenAS3
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/**
 * Copyright nondelion ( http://wonderfl.net/user/nondelion )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/o5cN
 */

/**
 * @see http://nondelion.com/archives/2009/09/16/2237
 */
package
{
	import flash.display.Sprite;
	import flash.text.*;
	import org.libspark.betweenas3.BetweenAS3;
	import org.libspark.betweenas3.easing.*;
	import org.libspark.betweenas3.tweens.ITween;
	import org.libspark.betweenas3.tweens.ITweenGroup;
	import org.libspark.betweenas3.tweens.IObjectTween;
	import org.libspark.betweenas3.events.TweenEvent;
	import net.hires.debug.Stats;
	
	[SWF(width="465", height="465", frameRate="60", backgroundColor="0x0")]
	
	public class Main extends Sprite
	{
		protected static const COL:int = 46;
		private var str:String = "";
		private var st:SequentialText;
		private var txt:TextField;
		private var tween:ITweenGroup;
		
		public function Main()
		{
			for(var i:int=0; i<COL; i++) {
				str += "Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl Wonderfl";
				if(i < COL-1){ str += "\r"; }
			}
			
			txt = newTextField();
			
			// 等速のテキストトランジションを作成
			st = new SequentialText(txt, 1.6);
			
			var t1:IObjectTween = BetweenAS3.tween( st, {position: st.totalTime}, {position: 0}, st.totalTime, Quad.easeInOut);
			var r1:ITween = BetweenAS3.reverse(t1); // 逆再生
			tween = BetweenAS3.serial(t1,r1);
			tween.stopOnComplete = false; // ループ設定
			tween.play(); // 再生
			
			//this.addChild(new Stats());
		}
		
		private function newTextField():TextField
		{
			var tf:TextField = addChild( new TextField() ) as TextField;
			tf.defaultTextFormat = new TextFormat("Verdana", 8, 0xffffff);
			tf.text = str;
			tf.autoSize = TextFieldAutoSize.LEFT;
			tf.selectable = false;
			tf.x = -1;
			return tf;
		}
	}
}

import flash.events.Event;
import flash.events.EventDispatcher;
import flash.text.TextField;

class SequentialText extends EventDispatcher
{
	private var currentIndex:uint;
	private var _text:String;
	private var _speed:Number;
	private var _txt:TextField;
	
	
	// 再生時間
	private var _totalTime:Number;
	public function get totalTime():Number
	{
		return _totalTime;
	}
	
	// 現在時刻
	private var _position:Number;
	public function set position(val:Number):void
	{
		_position = val;
		update();
	}
	
	// コンストラクタ
	public function SequentialText(tf:TextField, time:Number=1.0)
	{
		_txt = tf;
		_text = tf.text;
		_totalTime = time;
		_speed = _totalTime/_text.length; // 速度を求める
		_txt.text = "";
	}
		
	private function update():void
	{
		// 現在のテキストを取得
		currentIndex = Math.floor(_position/_speed);
		_txt.text = currentIndex > 0 ? _text.substr(0, currentIndex) : "";
		
		// 現在のテキストが正しい文字列になったら終了
		if(_totalTime <= _position) {
			_txt.text = _text;
			dispatchEvent(new Event(Event.COMPLETE));
		}
	}
}