//////////////////////////////////////////////////////////////////////////////// // // 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 ) ) ; } } }