四角いBitmapを三角にする

ポリゴンを使わずに四角を三角にする
* 極座標変換へのプロローグ

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license : All rights reserved
modified : 2009-03-11 14:35:10

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/*
 * ポリゴンを使わずに四角を三角にする
 * 極座標変換へのプロローグ
 */
package {
	import flash.display.Sprite;
	import flash.display.Shape;
	import flash.display.Loader;
	import flash.display.BitmapData;
	import flash.text.TextField;
	import flash.text.TextFormat;
	import flash.text.TextFieldAutoSize;
	import flash.net.URLRequest; 
	import flash.system.Security;
	import flash.events.Event;
	//import flash.events.ProgressEvent;
	import flash.events.MouseEvent;

[SWF(backgroundColor=0x000000)]
	public class Take05 extends Sprite {
		private const SW:Number = stage.stageWidth;
		private const SH:Number = stage.stageHeight;
		private var loader:Loader;
		private var textfield:TextField;
		private var topWidth:Number;
		private var topCenter:Number;
		private var myRect:Sprite;

public function Take05():void {
			// infomation
			var textFormat:TextFormat = new TextFormat();
			textFormat.color = 0xffffff;
			textfield = new TextField();
			textfield.defaultTextFormat = textFormat;
			textfield.setTextFormat(textFormat);
			textfield.autoSize = TextFieldAutoSize.LEFT;
			textfield.text = 'NowLoading...';
			addChild(textfield);
			
			// Bitmap読み込み
			var url:String = "http://www.seeda.jp/";
			Security.loadPolicyFile(url + "crossdomain.xml");
			loader = new Loader();
			loader.load(new URLRequest(url + "flash/visitor.jpg"));
			//loader.contentLoaderInfo.addEventListener(ProgressEvent.PROGRESS,onProgress);
			loader.contentLoaderInfo.addEventListener(Event.COMPLETE,onComplete);
		}
		
		private function sceenMotion(e:Event):void {
			var v:uint;
			var shape:Object;
			if (topWidth > 0) {
				// 四角から三角へ
				topWidth*=0.8;
				if (topWidth < 0.5) {
					topWidth = 0;
					topCenter = -myRect.width/2;
				}
				for (v = 0; v < myRect.height; v++) {
					shape = myRect.getChildAt(v);
					shape.width = topWidth + (myRect.width-topWidth) * ((v+1)/myRect.height);
				}
			} else if (topCenter != 0) {
				// 三角の頂点を真ん中へ
				topCenter*=0.48;
				if (Math.abs(topCenter) < 0.5) {
					topCenter = 0;
				}
				for (v = 0; v < myRect.height; v++) {
					shape = myRect.getChildAt(v);
					shape.x = (myRect.width/2 + topCenter) * ((myRect.height-v)/myRect.height);
				}
			}
		}
		
		private function sceenChange(e:MouseEvent):void {
			textfield.text = "from Rect to Triangle";
			e.target.removeEventListener(MouseEvent.CLICK, sceenChange);
			e.target.addEventListener(Event.ENTER_FRAME, sceenMotion);
		}

/*
		private function onProgress(e:ProgressEvent):void {
			//trace ("Loaded:" + e.bytesLoaded);
			//trace ("Total:" + e.bytesTotal);
			//trace ("Persent:" + Math.floor(e.bytesLoaded / e.bytesTotal * 100));
		}
		*/
		
		private function onComplete(e:Event):void {
			// 見た目は普通のBitmapだけど、実体は横線状のSpriteの集合体
			var bitmapData:BitmapData = new BitmapData(loader.content.width, loader.content.height,true);
			bitmapData.draw(loader);
			myRect = new Sprite();
			for (var v:uint = 0; v < bitmapData.height; v++) {
				var shape:Shape = new Shape();
				shape.graphics.beginBitmapFill(bitmapData);
				shape.graphics.drawRect(0,v,bitmapData.width,1);
				shape.graphics.endFill();
				myRect.addChild(shape);
			}
			myRect.x = (SW-myRect.width)/2;
			myRect.y = (SH-myRect.height)/2;
			addChild(myRect);
			topWidth = myRect.width;
			// Start message
			textfield.text = "Click Screen";
			stage.addEventListener(MouseEvent.CLICK, sceenChange);
		}
	}
}

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