Sand Button

forked:4
favorite:21
lines:161
license : MIT License
modified : 2009-05-23 13:36:33

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package {
	import flash.display.Sprite;
	import flash.utils.setTimeout;

[SWF(width=465, height=465, backgroundColor=0x00AEEF, frameRate=60)]
	
	public class Main extends Sprite
	{
		private static const TEXTCOLOR:uint = 0xffffff;
		private static const BGCOLOR:uint = 0x00AEEF;
		private static const LABEL_ARRAY:Array = ["HOME","ABOUT","WORKS","CONTACT"];
		
		public function Main()
		{
			init();
		}
		
		private function init():void
		{
			for(var i:int=0; i<4; i++) {
				var btn:SandButton = new SandButton(LABEL_ARRAY[i],48,TEXTCOLOR,BGCOLOR,false);
				btn.y = 40*i + 160;
				btn.x = 120;
				addChild(btn);
				setTimeout(btn.appearMotion, 40*(i+1));
			}
		}
	}
}

import flash.display.Sprite;
	import flash.display.BitmapData;
	import flash.display.Bitmap;
	import flash.events.Event;
	import flash.events.MouseEvent;
	import flash.text.TextField;
	import flash.text.TextFieldAutoSize;
	import flash.text.TextFormat;
	import flash.geom.Rectangle;
	import flash.geom.Point;
	import flash.filters.BlurFilter;
	
	class SandButton extends Sprite
	{
		private static const APPEAR_RANGE:Number = 100;
		private static const TAIL_LENGTH:Number = 30;
		private static const DISTANCE:Number = 500;
		private var bd:BitmapData;
		private var canvas:BitmapData;
		private var particles:Particle;
		private var pnum:uint = 0;
		private var _setup:Boolean;
		
		public function SandButton(buttonLabel:String, size:Number, textColor:uint, bgColor:uint, setup:Boolean)
		{
			_setup = setup;
			
			var tf:TextField = new TextField();
			tf.defaultTextFormat = new TextFormat('Helvetica', size, textColor, true);
			tf.autoSize = TextFieldAutoSize.LEFT;
			tf.text = buttonLabel;
			
			bd = new BitmapData(tf.width+TAIL_LENGTH, tf.height, true, bgColor+(0xff<<24));
			bd.lock();
			bd.fillRect(new Rectangle(tf.width,0,TAIL_LENGTH,tf.height),0x0);
			bd.draw(tf);
			
			var prev:Particle = particles = new Particle();
			var p:Particle;
			
			for (var i:int=0; i < tf.width; i++) {
				for (var j:int=0; j < tf.height; j++) {
					var color:uint = bd.getPixel(i, j);
					if ( color != bgColor ) {
						p = new Particle();
						p.x = i;
						p.y = j;
						p.sx = (Math.random()+1)*(i+1)*200 + DISTANCE;
						p.sy = p.y;
						p.cx = p.sx;
						p.cy = p.sy;
						p.vx = 2 + Math.random()*i/200;
						p.vy = 2;
						p.color = color;
						prev.next = p;
						prev = p;
						pnum++;
					} else {
						bd.setPixel32(i, j, 0x0);
					}
				}
			}
			bd.unlock();
			
			if( _setup ) {
				addChild( new Bitmap( bd ) );
				initEvent();
			}
		}
		
		private function initEvent():void
		{
			var over:Sprite = new Sprite();
			over.graphics.beginFill(0x0, 0);
			over.graphics.drawRect(0,0,bd.width,bd.height);
			over.graphics.endFill();
			addChild( over );
			
			over.addEventListener( MouseEvent.MOUSE_OVER, clickHandler );
		}
		
		public function appearMotion():void
		{
			if( !_setup ) {
				bd.fillRect(bd.rect,0x0);
				addChild( new Bitmap( bd ) );
				initEvent();
			}
			motion();
		}
		
		private function clickHandler(e:Event):void
		{
			motion();
		}
		
		private function motion():void
		{
			var p:Particle = particles;
			while((p = p.next) != null) {
				p.cx = p.sx;
				p.cy = p.sy;
			}
			if( !hasEventListener( Event.ENTER_FRAME ) ) {
				addEventListener( Event.ENTER_FRAME, update );
			}
		}
		
		private function update(e:Event):void
		{
			var num:int = 0;
			var p:Particle = particles;
			bd.lock();
			bd.fillRect(bd.rect, 0x0);
			
			while((p = p.next) != null) {
 			var r:Number = Math.sqrt((p.x-p.cx)*(p.x-p.cx) + (p.y-p.cy)*(p.y-p.cy));
				p.cx += (p.x - p.cx )/p.vx;
				p.cy += (p.y - p.cy )/p.vy;
				if ( Math.abs( p.cx - p.x ) <= 1 && Math.abs( p.cy - p.y) <= 1) {
					p.cx = p.x;
					p.cy = p.y;
					num++;
				}
				var a:uint = r < APPEAR_RANGE ? (1-r/APPEAR_RANGE)*255 : 0;
				var c:uint = p.color + (a << 24);
				bd.setPixel32(p.cx, p.cy, c);
			}
			bd.unlock();
			if(pnum == num) {
				e.target.removeEventListener(Event.ENTER_FRAME,arguments.callee);
			}
		}	
	}

class Particle 
{
	public var color:int;
	public var x:Number;
	public var y:Number;
	public var cx:Number;
	public var cy:Number;
	public var sx:Number;
	public var sy:Number;
	public var vx:Number;
	public var vy:Number;
	public var next:Particle;
	
	public function Particle()
	{
		
	}
}

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