ActionScript3で、文字列を使ったアニメーションの習作を作成してみました。
　AS3は、こういった処理をするが非常に楽です。
　
　
　
　
　
　
　

package practice
{
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.KeyboardEvent;
	import flash.events.MouseEvent;
	import flash.text.TextField;
	import flash.text.TextFieldType;

	[SWF(width = "440", height = "360", backgroundColor = "0xffffff", fps = "60")]
	public class Practice97 extends Sprite {
		private var list:Array;
		private var mode:Boolean;
		private var line:Array;

		public function Practice97() {
			list = new Array();
			line = new Array();
			var s1:Sprite = new Sprite();
			s1.graphics.beginFill(0x007700,0.4);
			s1.graphics.drawRect(0, 0, 400, 80);
			s1.graphics.endFill();
			s1.x = 1000;
			s1.y = 90;
			line.push(s1);
			addChild(s1);
			init();
			stage.addEventListener(MouseEvent.MOUSE_UP, function up(e:MouseEvent):void { init(); } );
		}

		private function init( ):void {
			while (this.numChildren > 1)this.removeChildAt(this.numChildren-1);
			while (list.length > 0) list.pop();
			mode = false;
			insert("TM's", 64, -30, 50);
			insert("WorkSpace", 64, -30, 120);
			insert(" since 2009", 32, 0, 220);
			insert(" -- Java,js,as3 and more", 24, -30, 300);
			addEventListener(Event.ENTER_FRAME, update);
		}

		private function insert(str:String, size:int, xx:int, yy:int):void {
			for (var i:int = 0; i < str.length; i++) {
				if (xx > 420) {
					xx = size*.75;
					yy += size * .75;
				}
				xx += size*.75;
				var c:Strings = new Strings(str.charAt(i),xx,yy,size);
				c.x = Math.random() * 440;
				c.y = Math.random() * 440;
				c.z = -Math.random() * 10000;
				c.scale(Math.random() * 30 + 10);
				addChild(c);
				list.push(c);
			}
		}

		private function update(e:Event):void {
			var minz:Number = 100000000;
			for each(var p:Strings in list) {
				p.update(mode);
				if (!mode && p.z < minz) minz = p.z;
			}
			if (minz > 4000) mode = true;
			if (mode) {
				for each(var q:Sprite in line) {
					q.x += ( 20 - q.x) * 0.05;
				}
			}
		}
	}
}
import flash.display.Sprite;
import flash.events.Event;
import flash.filters.BlurFilter;
import flash.filters.DropShadowFilter;
import flash.text.TextField;
import flash.text.TextFormat;
class Strings extends Sprite {
	private var text:TextField;
	private var vec:Array;
	private var blur:BlurFilter;
	private var drop:DropShadowFilter;
	private var bx:Number;
	private var by:Number;

	public function Strings(s:String, bx:int, by:int, si:int) {
		this.bx = bx;
		this.by = by;
		text = new TextField();
		addChild(text);
		text.background = false;
		var tf:TextFormat = new TextFormat();
		tf.size = si;
		tf.color = 0x000000;
		text.defaultTextFormat = tf;
		text.text = s;
		text.width = text.textWidth + 5;
		text.height = text.textHeight + 5;
		this.rotationZ = Math.random() * 360;
		vec = [Math.random()*20-10,Math.random()*20-10,Math.random()*50+50];
		blur = new BlurFilter(64,64,1);
		this.filters = [blur];
	}

	public function scale(s:Number):void {
		this.scaleX = s;
		this.scaleY = s;
	}

	public function update(mode:Boolean):void {
		if (!mode) {
			this.x += vec[0];
			this.y += vec[1];
			this.z += vec[2];
			if (this.rotationZ % 360 != 0) this.rotationZ += 1;
			if (this.z > 0) {
				var bn:Number= Math.max(1, 10000 / this.z);
				if (bn > 1) {
					blur.blurX = bn;
					blur.blurY = bn;
					this.filters = [blur];
				}else {
					this.filters = [];
				}
			}
		}else {
			this.filters = [];
			this.x += (this.bx - this.x) * 0.1;
			this.y += (this.by - this.y) * 0.1;
			this.z += (0 - this.z) * 0.1;
			this.rotationZ = this.rotationZ % 360;
			if (this.rotationZ != 0) this.rotationZ += (360 - this.rotationZ) * 0.1;
			this.scaleX += (1 - this.scaleX) * 0.1;
			this.scaleY += (1 - this.scaleY) * 0.1;
		}
	}
}

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