描いたラインが芋虫のように追いかけてきます

...
@author okoi

forked:1
favorite:32
lines:152
license : MIT License
modified : 2010-03-12 14:31:27

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package {
	import flash.display.Sprite;
	import flash.events.Event;
	import flash.events.MouseEvent;
	
	/**
	 * ...
	 * @author okoi
	 */
	[SWF(width = "465", height = "465", backgroundColor = "0x000000", frameRate = "30")]
	public class Main extends Sprite 
	{
		private var workLine:Line = null;
		
		public function Main():void 
		{
			if (stage) init();
			else addEventListener(Event.ADDED_TO_STAGE, init);
		}
		
		private function init(e:Event = null):void 
		{
			removeEventListener(Event.ADDED_TO_STAGE, init);			
			stage.addEventListener(MouseEvent.MOUSE_DOWN, DrawStart);
		}
		
		/**
		 * お絵かきを開始
		 * @param	e
		 */
		private function DrawStart(e:MouseEvent):void {
			var line:Line = new Line();
			workLine = line;
			line.x = 0;
			line.y = 0;
			addChild(line);
			stage.addEventListener(MouseEvent.MOUSE_MOVE, DrawPath);
			stage.addEventListener(MouseEvent.MOUSE_UP, DrawEnd);
		}
		private function DrawPath(e:MouseEvent):void {
			if ( workLine != null )
			{
				workLine.AddPath( stage.mouseX, stage.mouseY );
			}
		}
		private function DrawEnd(e:MouseEvent):void {
			stage.removeEventListener(MouseEvent.MOUSE_UP, DrawEnd);
			stage.removeEventListener(MouseEvent.MOUSE_MOVE, DrawPath);
			workLine.RunStart();
			workLine = null;
		}
	}

}
////////////////////////////////////////////////////////////////////////////////////
////////////////////////////////////////////////////////////////////////////////////
import flash.display.MovieClip;
import flash.events.Event;

//	ラインクラス
class Line extends MovieClip {
	
	private static const MODE_DRAW:int = 0;
	private static const MODE_RUN:int  = 1;
	private var mode:int = 0;
	
	private var linePath:Array = new Array();
	private var movePower:int = 0;
	private var speedRate:int = 0;
	private var targetX:int = 0;
	private var targetY:int = 0;
	private var targetZ:int = 0;
	
	public function Line() 
	{
		super();
		
		mode = MODE_DRAW;
		movePower = 20;
		
		addEventListener( Event.ENTER_FRAME, EnterFrame );
		addEventListener( Event.REMOVED_FROM_STAGE, RemoveFromStage );
	}
	public function RemoveFromStage(e:Event):void {
		removeEventListener( Event.REMOVED_FROM_STAGE, RemoveFromStage );	
		removeEventListener( Event.ENTER_FRAME, EnterFrame );
	}
	
	public function EnterFrame(e:Event) : void {
	
		if ( !stage ) return;
		var i:int;
		
		graphics.clear();
		
		if ( mode == MODE_DRAW )
		{
			graphics.lineStyle( 4, 0xFF0000, 1 );
			for ( i = 0; i < linePath.length; i++ )
			{
				if ( i == 0 )
				{
					graphics.moveTo( linePath[i][0], linePath[i][1] );
				}else
				{
					graphics.lineTo( linePath[i][0], linePath[i][1] );
				}
			}
			
		}else
		{			
			graphics.lineStyle( 4, 0xFF0000, 1 );
			for ( i = 0; i < linePath.length; i++ )
			{
				if ( i == 0 )
				{
					linePath[i][1] += (targetY - linePath[i][1]) / speedRate;
					linePath[i][0] += (targetX - linePath[i][0]) / speedRate;
					if( Math.sqrt( (linePath[0][1] - targetY) * (linePath[0][1] - targetY) + (linePath[0][0] - targetX) * (linePath[0][0] - targetX) ) < 1 )	SetTargetPos(linePath[0][0],linePath[0][1]);
					
					graphics.moveTo( linePath[i][0], linePath[i][1] );
				}else
				{
					{
						linePath[i][1] += (linePath[i-1][1] - linePath[i][1]) / speedRate;
						linePath[i][0] += (linePath[i-1][0] - linePath[i][0]) / speedRate;
					}
					
					graphics.lineTo( linePath[i][0], linePath[i][1] );
				}
			}
		
		}
		
	}
	
	/**
	 * ラインのパスを追加していく
	 * @param	_x
	 * @param	_y
	 */
	public	function AddPath(_x:int, _y:int):void {
		linePath.push( new Array( _x, _y ) );
	}
	
	/**
	 * 描画モード終了、追尾モードへ
	 * もしパスが不十分だと消してもらう
	 */
	public	function RunStart() : void {
		mode = MODE_RUN;
		speedRate = int(Math.random() * 10) + 2;
		movePower = int(Math.random() * 30) + 20;
		if ( linePath.length <= 1 )
		{
			parent.removeChild(this);
		}else
		{
			linePath.reverse();	//	反転させて最後についたパスを先頭にする
			SetTargetPos( linePath[0][0], linePath[0][1] );
		}
	}
	
	/**
	 * 次のターゲットポイントを決める
	 * @param	nowX	現在の位置
	 * @param	nowY	現在の位置
	 */
	public	function SetTargetPos(nowX:int,nowY:int):void 
	{
		var sX:int;
		var sY:int;
		if ( !stage )
		{
			sX = sY = 0;
		}else
		{
			sX = stage.mouseX;
			sY = stage.mouseY;
		}
		
		//	マウスまでのベクトルを正規化
		var len:Number = Math.sqrt((sX - nowX) * (sX - nowX) + (sY - nowY) * (sY - nowY));
		var nX:Number = (sX - nowX) / len;
		var nY:Number = (sY - nowY) / len;
		
		//	サブ目標地点設定
		//	移動力よりマウスまでの方が近かったらそっち優先で
		var tempX:Number;
		var tempY:Number; 
		if ( len < movePower )
		{
			tempX = sX;
			tempY = sY;
		}else
		{
			tempX = nowX + (nX * movePower);
			tempY = nowY + (nY * movePower);
		}
		
		//	マウスから若干はずした地点にいくようにぶれさす
		var randR:Number = int(Math.random() * 360) * Math.PI/180;
		var randL:Number = int(Math.random() * (movePower));
		targetX = tempX + Math.cos( randR ) * randL;
		targetY = tempY + Math.sin( randR ) * randL;
		
	}
}

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