forked from: forked from: forked from: forked from: flash on 2009-5-1

by 9zgb_vvd 01 May 2009

Embed

package{
	
	import flash.display.*;
	import flash.geom.Point;
	import flash.events.*;
	import flash.text.*;
	import flash.utils.*;
	
	[SWF(width="400", height="400", backgroundColor="#000000", frameRate="15")]
	
	public class mandelbrot extends Sprite{
		//キャンバスサイズ
		private const WIDTH:int = 400;
		private const HEIGHT:int = 400;
		
		//マンデルブロ集合パラメータ
		private var repMax:int = 256; //最大計算回数
		private var real:Number = -1.74972763;	//実数部
		private var imag:Number = -3.41468548e-005; //虚数部 (-2≦ a ≦0.5 , -1.25≦ b ≦1.25 の範囲)
		private var zoom:Number = 1; //拡大率
		private var scale:Number; //描画範囲
		private var a:Number;
		private var b:Number;
		private var step:Number;
		
		//表示用
		private var canvas:Sprite;
		private var pt:Point;
		private var bmp:BitmapData;
		private var info:TextField;
		private var fmt:TextFormat;
		private var fstop:Boolean = false;
		
		private var fpsInfo:TextField;
		private var update_time:int = 500;       // 表示が変わる時間（ミリ秒）
		private var draw_count:int = 0;          // 描画カウント
		private var old_timer:Number = getTimer();  // 時間待避
		
		
		public function mandelbrot() {
			addEventListener(Event.ADDED_TO_STAGE, init);
			addEventListener(Event.REMOVED_FROM_STAGE, onRemoveFromStage);
		}
		
		private function init(e:Event):void {
			stage.scaleMode = "noScale";
			canvas = new Sprite();
			pt = new Point();
			bmp = new BitmapData(WIDTH, HEIGHT, false, 0xefefef);
			info = new TextField();
			fmt = new TextFormat("Arial",12,0xffffff,true);
			fmt.align = TextFormatAlign.RIGHT;
			info.autoSize = TextFieldAutoSize.RIGHT;
			info.x = 390;
			info.y = 360;
			info.defaultTextFormat = fmt;
			
			fpsInfo = new TextField();
			fpsInfo.autoSize = TextFieldAutoSize.LEFT;
			fpsInfo.x = 10;
			fpsInfo.y = 360;
			fpsInfo.defaultTextFormat = fmt;
			
			this.addChild(canvas);
			canvas.addChild(new Bitmap(bmp));
			canvas.addChild(info);
			canvas.addChild(fpsInfo);
			this.addEventListener(MouseEvent.CLICK, pause);
			this.addEventListener(Event.ENTER_FRAME, drawMandelbrot,false,1,true);
			this.addEventListener(Event.ENTER_FRAME, fpsCount, false, 1, true);
		}
			
		private function drawMandelbrot(e:Event):void {
			var old_time:int = getTimer();	
			zoom *= 1.08;
			scale = 1.0/zoom;
			a = real;
			b = imag;
			step = scale / WIDTH;
			
			if (zoom > 6.0e+014) {
				this.removeEventListener(Event.ENTER_FRAME, drawMandelbrot);
				this.removeEventListener(MouseEvent.CLICK, pause);
			}
					
			bmp.lock();
			for(var y:int = 0; y<HEIGHT; y++){
				for(var x:int = 0; x<WIDTH; x++){
					pt.x = x;
					pt.y = y;
					calcMandelbrot();
					a += step;
				}
					a = real;	
					b += step;
			}
			bmp.unlock();
			info.text = "Zoom: " + Math.floor(zoom) + "x\n";	
		}	

		//マンデルブロ集合の計算
		private function calcMandelbrot():void {
			var xi:Number = 0;
			var yi:Number = 0;
			var xip:Number = 0;
			var yip:Number = 0;
			var n:int = 0;
			
			while (n < repMax) {
				xip = xi*xi-yi*yi+a;
				yip = 2*xi*yi+b;
				xi = xip;
				yi = yip;
				//発散判定
				if (xi*xi+yi*yi > 4) break; 
				n++;
			}
			bmp.setPixel(pt.x, pt.y, getColor(n));
		}
			
		private function getColor(n:int):uint {
			var r:uint = ((n-64) & 0x2f) <<2;
			var g:uint = ((n-32) & 0x1f) <<3;
			var b:uint = (n & 0xf) <<4;
			return r << 16 | g << 8 | b;
		}
		
		public function pause(e:Event):void {
			if(!fstop){
				this.removeEventListener(Event.ENTER_FRAME, drawMandelbrot);
				fstop = true;
				info.appendText("Pause..");
			}else{
				this.addEventListener(Event.ENTER_FRAME, drawMandelbrot);
				fstop = false;
			}	
		}
		
		private function fpsCount(e:Event):void {
			draw_count += 1;
			if (getTimer()-old_timer >= update_time) {
				var fps:Number = draw_count * 1000 / (getTimer() - old_timer);
				fpsInfo.text = ""Math.floor(fps * 10) / 10;  
				old_timer = getTvc+imer();
				draw_count = 0;
			}
		}
		
		private function onRemoveFromStage(e:Event):void{
			removeEventListener(Event.ENTER_FRAME, drawMandelbrot);
			//trace("removed!!");
		}
	}
}