ベンハムの独楽

by USK 16 Mar 2010

Talk

makc3d at 24 Jan 2013 19:14
I never had this working in real life either
Embed

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

package {
	import flash.display.*;
	import flash.events.*;
	import flash.net.URLRequest;
	import flash.system.LoaderContext;
	import flash.text.*;
	
	public class Index extends Sprite {
		
		private static const IMG_URL :String = "http://upload.wikimedia.org/wikipedia/commons/thumb/2/2e/Benham%27s_Disc.svg/250px-Benham%27s_Disc.svg.png";
		
		private var _koma  :Sprite;
		private var _speed :Number = 0.1;
		private var _axcel :Number = 1.1;
		private var _maxSpeed :Number = 120;
		
		public function Index() {
			
			start();
		}
		
		private function start():void
		{
			var loader:Loader = new Loader();
			loader.contentLoaderInfo.addEventListener(Event.INIT, loadComplete);
			loader.contentLoaderInfo.addEventListener(IOErrorEvent.IO_ERROR, ioError);
			
			try {
				loader.load(new URLRequest(IMG_URL), new LoaderContext(true));
			}catch (e:SecurityError) {
				errorText("securityError");
			}
		}
		
		private function ioError(e:IOErrorEvent):void 
		{
			e.target.removeEventListener(Event.INIT, loadComplete);
			e.target.removeEventListener(IOErrorEvent.IO_ERROR, ioError);
			errorText("ioError");
		}
		
		private function loadComplete(e:Event):void 
		{
			e.target.removeEventListener(Event.INIT, loadComplete);
			e.target.removeEventListener(IOErrorEvent.IO_ERROR, ioError);
			
			var loader:Loader = new Loader();
			loader.contentLoaderInfo.addEventListener(Event.INIT, init);
			loader.loadBytes(e.target.bytes);
		}
		
		private function init(e:Event):void 
		{
			e.target.removeEventListener(Event.INIT, loadComplete);
			
			var loader:Loader = e.currentTarget.loader;
			var bmd:BitmapData = new BitmapData(loader.width, loader.height, true, 0x0);
			bmd.draw(loader);
			var bm:Bitmap = new Bitmap(bmd);
			
			var sp:Sprite = new Sprite();
			this.addChild(sp);
			sp.addChild(loader);
			//loader.x = - Math.floor(loader.width / 2) - 2;
			loader.x = - 122;
			//loader.y = - Math.floor(loader.height / 2) - 2;
			loader.y = - 128;
			sp.x = stage.stageWidth / 2;
			sp.y = stage.stageHeight / 2;
			_koma = sp;
			
			var startBtn:BtnClass = new BtnClass("Start");
			this.addChild(startBtn);
			startBtn.addEventListener(Event.CHANGE, startClick);
			startBtn.y = 400;
			startBtn.x = 150;
			
			var stopBtn:BtnClass = new BtnClass("Stop");
			this.addChild(stopBtn);
			stopBtn.addEventListener(Event.CHANGE, stopClck);
			stopBtn.y = 400;
			stopBtn.x = 230;
			
			this.addEventListener(Event.ENTER_FRAME, startRotation);
		}
		
		private function startRotation(e:Event):void 
		{
			var r:Number = _koma.rotation;
			_speed *= _axcel;
			if (_speed >= _maxSpeed) _speed = _maxSpeed;
			if (_speed <= 0) _speed = 0;
			r += _speed;
			if (r >= 360) r -= 360;
			_koma.rotation = r;
		}
		
		private function startClick(e:Event):void 
		{
			_speed += 0.1;
			_axcel = 1.1;
		}
		
		private function stopClck(e:Event):void 
		{
			_axcel = 0.9;
		}
		
		
		private function errorText(str:String):void
		{
			var txt:TextField = new TextField();
			txt.autoSize = TextFieldAutoSize.LEFT;
			txt.wordWrap = false;
			
			var format:TextFormat = new TextFormat();
			format.color = 0x0;
			format.size = 12;
			
			txt.defaultTextFormat = format;
			
			txt.text = str;
			this.addChild(txt);
		}
	}
}


import flash.display.*;
import flash.text.*;
import flash.events.*;

class BtnClass extends Sprite {
	
	public function BtnClass(label:String):void
	{
		var btn:Sprite = new Sprite();
		this.addChild(btn);
		btn.graphics.lineStyle(1, 0x333333, 1);
		btn.graphics.beginFill(0xFFFFFF, 1);
		btn.graphics.drawRect(0, 0, 70, 20);
		btn.graphics.endFill();
		
		var txt:TextField = new TextField();
		txt.autoSize = TextFieldAutoSize.CENTER;
		txt.wordWrap = false;
		
		var format:TextFormat = new TextFormat();
		format.color = 0x333333;
		format.size = 14;
		txt.defaultTextFormat = format;
		txt.text = label;
		btn.addChild(txt);
		txt.x = 35 - Math.floor(txt.width / 2);
		txt.y = 10 - Math.floor(txt.height / 2);
		txt.selectable = false;
		
		this.addEventListener(MouseEvent.ROLL_OVER, over);
		this.addEventListener(MouseEvent.ROLL_OUT, our);
		this.addEventListener(MouseEvent.CLICK, click);
	}
	
	private function over(e:MouseEvent):void 
	{
		this.alpha = 0.5;
	}
	
	private function our(e:MouseEvent):void 
	{
		this.alpha = 1;
	}
	
	private function click(e:MouseEvent):void 
	{
		this.dispatchEvent(new Event(Event.CHANGE));
	}
	
}