キラキラ

キラキラがやってみたかったので作ってみました。
参考
http://wonderfl.net/code/71344f9a655053d9f793a32c68f00921c67f1977

by matsu4512 18 Dec 2009

• Related works: 2
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/**
 * Copyright matsu4512 ( http://wonderfl.net/user/matsu4512 )
 * MIT License ( http://www.opensource.org/licenses/mit-license.php )
 * Downloaded from: http://wonderfl.net/c/1XbH
 */

/*
キラキラがやってみたかったので作ってみました。
参考
http://wonderfl.net/code/71344f9a655053d9f793a32c68f00921c67f1977
*/
package {
	
	import flash.display.Bitmap;
	import flash.display.BitmapData;
	import flash.display.BlendMode;
	import flash.display.PixelSnapping;
	import flash.display.Sprite;
	import flash.display.StageAlign;
	import flash.display.StageScaleMode;
	import flash.events.Event;
	import flash.geom.Matrix;
	
	import frocessing.color.ColorHSV;

	[SWF(width=465, height=465, backgroundColor=0x0, frameRate=30)]

	public class kirakira extends Sprite {
		
		private var cvs:BitmapData;
		private var glow_bmpData:BitmapData;
		private var glowMtx:Matrix;
		private var particles:Array;
		private var w:Number, h:Number, hw:Number, hh:Number;
		private var r:Number, theta:Number=0;
		private var hsvc:ColorHSV = new ColorHSV(0,0.5,0.5);
		private var color:uint = 0;
		
		public function kirakira() {
			stage.scaleMode = StageScaleMode.NO_SCALE;
			stage.align = StageAlign.TOP_LEFT;
			
			w = stage.stageWidth;
			hw = 0.5*w;
			h = stage.stageHeight;
			hh = 0.5*h;
			r = Math.sqrt(w*w+h*h);
			
			this.cvs = new BitmapData(465, 465, false, 0x0);
			addChild(new Bitmap(cvs)) as  Bitmap;
			glow_bmpData = new BitmapData(465 / 4, 465 / 4, false, 0x0);
			var bm:Bitmap = addChild(new Bitmap(glow_bmpData, PixelSnapping.NEVER, true)) as Bitmap;
			bm.scaleX = bm.scaleY = 4;
			bm.blendMode = BlendMode.ADD;
			glowMtx = new Matrix(0.25, 0, 0, 0.25);
			
			particles = [];

			addEventListener(Event.ENTER_FRAME, update);
		}
		
		public function createParticle(xx:Number, yy:Number, c:int, vx:Number, vy:Number):void {
			var p:Particle = new Particle();
			p.x = xx;
			p.y = yy;
			p.vx = vx;
			p.vy = vy;
			p.c = c;
			particles.push(p);
		}
		
		public function update(e:Event):void {
			cvs.lock();
			cvs.fillRect(cvs.rect, 0);
			var n:int = particles.length;
			while (n--) {
				var p:Particle = particles[n];
				p.vx *= 1.01;
				p.vy *= 1.01;
				p.x += p.vx;
				p.y += p.vy;
				cvs.setPixel(p.x, p.y, p.c);
				if (p.y < 0 || p.y > h || p.x < 0|| p.x > w) {
					particles.splice(n, 1);
				}
			}
			cvs.unlock();
			glow_bmpData.draw(cvs, glowMtx);
			
			n = 10;
			hsvc.h += 3;
			var c:uint = (hsvc.toRGB().value);;
			while (n--) {
				createParticle(hw, hh, c, Math.cos(theta)+0.1*Math.random()-0.05, Math.sin(theta)+0.1*Math.random()-0.05);
				createParticle(hw, hh, c, Math.cos(theta+Math.PI*0.5)+0.1*Math.random()-0.05, Math.sin(theta+Math.PI*0.5)+0.1*Math.random()-0.05);
				createParticle(hw, hh, c, Math.cos(theta+Math.PI)+0.1*Math.random()-0.05, Math.sin(theta+Math.PI)+0.1*Math.random()-0.05);
				createParticle(hw, hh, c, Math.cos(theta+Math.PI*1.5)+0.1*Math.random()-0.05, Math.sin(theta+Math.PI*1.5)+0.1*Math.random()-0.05);
			}
			theta+= 0.05;
		}
	}
}


class Particle {
	public var x:Number;
	public var y:Number;
	public var vx:Number;
	public var vy:Number;
	public var c:uint;
}