要素の軌跡にパーティクルを出す

//////////////////////////////////////////////////////////////////////////////
要素の軌跡にパーティクルを出す
//////////////////////////////////////////////////////////////////////////////

twistcube

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license : All rights reserved
modified : 2009-04-21 23:19:13

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////////////////////////////////////////////////////////////////////////////////
//
//  要素の軌跡にパーティクルを出す
//
////////////////////////////////////////////////////////////////////////////////
package
{
	import flash.display.* ;
	import flash.events.* ;
	import flash.net.* ;
	import flash.system.* ;
	
	[SWF(width="500", height="500", backgroundColor="0x33302E", frameRate="30")]
	public class Stardust2 extends Sprite
	{
		private var _distance:Object  = { min:200, max:300 } ;   // 落ちる距離
		private var _move_spd:Object  = { min:0.01, max:0.03 } ; // 落ちる速さ
		private var _clear_spd:Object = { min:0.02, max:0.06 } ; // 消える速さ
		private var _scale_spd:Object = { min:0.02, max:0.06 } ; // 拡大／縮小する速さ
		
		private var _rotation:Number = 0 ;
		private var _prevX:Number = 0 ;
		private var _prevY:Number = 0 ;
		private var _renderCount:uint = 0 ;
		private var _yoyo:Yoyo ;
		
		public function Stardust2( )
		{
			init( ) ;
		}
		
		private function init( ):void
		{
			stage.scaleMode = StageScaleMode.NO_SCALE ;
			stage.align = StageAlign.TOP_LEFT ;
			// stage.quality = StageQuality.LOW ;
			
			_yoyo = new Yoyo( ) ;
			addChild( _yoyo ) ;
			
			addEventListener( Event.ENTER_FRAME, onRender );
		}
		
		public function xRotation( ):Number
		{
			return _rotation ;
		}
		
		private function onRender( event:Event ):void
		{
			if ( _prevX == _yoyo.x && _prevY == _yoyo.y )
			{
				return ;
			}
			
			_rotation = Math.atan2( _prevX - _yoyo.x, _prevY - _yoyo.y ) * 180 / Math.PI + 90 ;
			_prevX = _yoyo.x ;
			_prevY = _yoyo.y ;
			
			for ( var i:Number=0; i<3; i++ )
			{
				// パーティクルを生成
				var obj:StarSprite = new StarSprite( _distance, _move_spd, _clear_spd, _scale_spd, _rotation ) ;
				obj.x = _yoyo.x ;
				obj.y = _yoyo.y ;
				obj.addEventListener( Event.COMPLETE, onComplete ) ;
				
				addChild( obj ) ;
				
				// 4個に1個だけ大きくする
				if ( _renderCount == 4 )
				{
					obj.scaleX = obj.scaleY = Math.random( ) * 2 + 0.8 ;
					_renderCount = 0 ;
				}
				else
				{
					obj.scaleX = obj.scaleY = Math.random( ) * .4 + .4 ;
					_renderCount++ ;
				}
			}
			
			// 常に最前面にする
			addChild( _yoyo ) ;
		}
		
		private function onComplete( event:Event ):void
		{
			var obj:StarSprite = event.target as StarSprite ;
			removeChild( obj ) ;
			obj = null ;
		}
	}
}

import flash.display.* ;
import flash.events.* ;
import flash.geom.* ;
import flash.filters.* ;

class Yoyo extends Sprite
{
	private const SPRING:Number = .1 ;
	private const FRICTION:Number = .9 ;
	private var _vect:Point ;
	private var _source:Sprite ;
	
	public function Yoyo( )
	{
		addEventListener( Event.ADDED_TO_STAGE, init ) ;
		addEventListener( Event.REMOVED_FROM_STAGE, unload ) ;
	}

private function init( event:Event ):void
	{
		removeEventListener( Event.ADDED_TO_STAGE, init ) ;
		
		_source = new Sprite( ) ;
		x = stage.stageWidth / 2 ;
		y = stage.stageHeight / 2 ;
		_source.graphics.beginFill( 0xe3f23e ) ;
		_source.graphics.drawCircle( 0, 0, 10 ) ;
		_source.graphics.endFill( ) ;
		addChild( _source ) ;
		
		_vect = new Point( 100 * Math.random( ) - 50, 100 * Math.random( ) - 50 ) ;
		
		filters= [ new BlurFilter( 10, 10, 3 ) ] ;
		//filters = [ new DropShadowFilter( 10, 45, 0x7c863d, 0.5, 5, 5, 5 ) ] ;
		
		addEventListener( Event.ENTER_FRAME, onRender ) ;
	}
	
	private function unload( event:Event = null ):void
	{
		removeEventListener( Event.REMOVED_FROM_STAGE, unload ) ;
		removeEventListener( Event.ENTER_FRAME, onRender ) ;
	}
	
	private function onRender( event:Event ):void
	{
		_vect.x += ( stage.mouseX - x ) * SPRING ;
		_vect.y += ( stage.mouseY - y ) * SPRING ;
		_vect.x *= FRICTION ;
		_vect.y *= FRICTION ;
		x += _vect.x ;
		y += _vect.y ;
	}
}

import flash.display.* ;
import flash.events.* ;
import flash.filters.* ;

class StarSprite extends Sprite
{
	private var _distance:Number ;  // 落ちる距離
	private var _move_spd:Number ;  // 落ちる速さ
	private var _clear_spd:Number ; // 消える速さ
	private var _scale_spd:Number ; // 拡大／縮小する速さ
	private var _rotation:Number ;
	private var _vx:Number ;
	private var _vy:Number ;

public function StarSprite( _distance:Object, _move_spd:Object, _clear_spd:Object, _scale_spd:Object, _rotation:Number ):void
	{
		this._distance  = _distance.min  + Math.random( ) * ( _distance.max - _distance.min ) ;
		this._move_spd  = _move_spd.min  + Math.random( ) * ( _move_spd.max - _move_spd.min ) ;
		this._clear_spd = _clear_spd.min + Math.random( ) * ( _clear_spd.max - _clear_spd.min ) ;
		this._scale_spd = _scale_spd.min + Math.random( ) * ( _scale_spd.max - _scale_spd.min ) ;
		this._rotation  = _rotation ;
		
		addEventListener( Event.ADDED_TO_STAGE, init ) ;
		addEventListener( Event.REMOVED_FROM_STAGE, unload ) ;
	}

private function init( event:Event ):void
	{
		removeEventListener( Event.ADDED_TO_STAGE, init ) ;
		
		graphics.clear( ) ;
		graphics.beginFill( 0xa6a53f );
		graphics.drawCircle( 0, 0, 4 ) ;
		graphics.drawCircle( 0, 0, 2 ) ;
		graphics.endFill( ) ;
		
		//filters = [ new DropShadowFilter( 10, 45, 0x7c863d, 0.5, 5, 5, 5 ) ] ;
		
		xAction( ) ;
	}
	
	private function unload( event:Event = null ):void
	{
		removeEventListener( Event.REMOVED_FROM_STAGE, unload ) ;
		removeEventListener( Event.ENTER_FRAME, onRender ) ;
	}
	
	private function xAction( ):void
	{
		var rot:Number   = _rotation + Math.random( ) * 120 - 60 ;
		var theta:Number = rot * Math.PI / 180 ;
		
		_vx = x - Math.cos( theta ) * _distance ;
		_vy = y + Math.sin( theta ) * _distance ;
		
		addEventListener( Event.ENTER_FRAME, onRender ) ;
	}
	
	private function onRender( event:Event ):void
	{
		x += ( _vx - x ) * _move_spd ;
		y += ( _vy - y ) * _move_spd ;
		alpha -= _clear_spd ;
		scaleX += _scale_spd ;
		scaleY += _scale_spd ;
		
		if ( alpha < 0 )
		{
			dispatchEvent( new Event( Event.COMPLETE ) ) ;
		}
	}
}

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