forked from: particleText

MdN BOOKS - THE NETA-cho Deluxe FLASH TECHNIC 参考
wonderfl用にクラスを1つにまとめました。
コメント省いてすみません。

by dotf 12 Nov 2009

• Forked from dimentity's particleText
• Diff: 1
• Related works: 6
Embed

// forked from dimentity's particleText
// MdN BOOKS - THE NETA-cho Deluxe FLASH TECHNIC 参考
// wonderfl用にクラスを1つにまとめました。
// コメント省いてすみません。

package {
	import flash.display.Sprite;
	import flash.display.MovieClip;
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.geom.Rectangle;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFormat;
	[SWF(width = "465", height = "465", backgroundColor = "0x000000", frameRate = "30")]

	public class ParticleText extends Sprite {
		private var canvas:BitmapData;
		private var textCanvas:BitmapData;
		private var _num:int = 0;
		private var maxDis:int = 400;
		
		// particles
		private var particleX:Array = new Array();
		private var particleY:Array = new Array();
		private var particleEx:Array = new Array();
		private var particleEy:Array = new Array();
		private var particleC:Array = new Array();
		
		public function ParticleText() {
			canvas = new BitmapData(
				stage.stageWidth,
				stage.stageHeight,
				false,
				0x000000
			);
			addChild(new Bitmap(canvas));
			
			var tf:TextField = new TextField();
			tf.defaultTextFormat = new TextFormat(
				"Times New Roman",
				60,
				0xFFFFFF
			);
			tf.autoSize = TextFieldAutoSize.LEFT;
			tf.text = "ABCDEFG\nHIJKLMN\nOPQRSTU\nVWXYZ";
			
			textCanvas = new BitmapData(
				tf.textWidth,
				tf.textHeight,
				false,
				0x000000
			);
			
			textCanvas.draw(tf);
			
			var ofx:Number = stage.stageWidth / 2 - textCanvas.width / 2;
			var ofy:Number = stage.stageHeight / 2 - textCanvas.height / 2;
			
			var num:Number = 0;
			var rad:Number;
			var dis:Number;

			for (var ex:Number = 0; ex < textCanvas.width; ex++) {
				for (var ey:Number = 0; ey < textCanvas.height; ey++) {
					var c:uint = textCanvas.getPixel(ex, ey);
					if (c != 0x000000) {
						particleEx[num] = ex + ofx;
						particleEy[num] = ey + ofy;
						particleC[num] = c;
						rad = Math.random() * (Math.PI * 2);
						dis = Math.random() * maxDis;
						particleX[num] = ex + dis * Math.cos(rad);
						particleY[num] = ex + dis * Math.sin(rad);
						num++;
					}
				}
			}

			stage.addEventListener(Event.ENTER_FRAME, onEnterframe);
		}

		private function onEnterframe( evt:Event ):void {
			canvas.lock();
			canvas.fillRect(canvas.rect, 0x000000);
			for(var i:int = 0; i < _num; i++) {
				if(Math.abs(particleEx[i] - particleX[i]) < 0.5 &&
					 Math.abs(particleEy[i] - particleY[i]) < 0.5) {
					particleX[i] = particleEx[i];
					particleY[i] = particleEy[i];
				} else {
					particleX[i] += (particleEx[i] - particleX[i]) * 0.1;
					particleY[i] += (particleEy[i] - particleY[i]) * 0.1;
				}
				canvas.setPixel(particleX[i], particleY[i], particleC[i]);
			}
			
			var n:int = particleX.length;
			
			_num = (_num + 30 < n) ? _num + 30 : particleX.length;
			canvas.unlock();
		}
	}
}