Flash AS3代码打造绚烂的星形变幻效果

package
　{
　import flash.display.Sprite;
　import flash.events.Event;
　import flash.events.MouseEvent;
　[SWF(backgroundColor = "0x000000", frameRate = "60")]
　public class Main extends Sprite
　{
　private var patternList:Array = new Array();
　private var moveBullet:Array = new Array();
　public function Main():void
　{
　if (stage) init();
　else addEventListener(Event.ADDED_TO_STAGE, init);
　}
　private function init(e:Event = null):void
　{
　removeEventListener(Event.ADDED_TO_STAGE, init);
　// entry point
　MouseDown(null);
　addEventListener(Event.ENTER_FRAME, EnterFrame );
　stage.addEventListener(MouseEvent.MOUSE_DOWN, MouseDown);
　}
　private function EnterFrame(event:Event):void
　{
　var i:int = 0;
　for ( i = 0; i < patternList.length; i++ )
　{
　var bullet:Bullet = patternList[i].Run();
　if ( bullet != null )
　{
　addChild( bullet );
　}
　}
　for ( i = patternList.length - 1; i >= 0; i-- )
　{
　if ( patternList[i].isEnd() )
　{
　// 从待命到移动
　for ( var j:int = 0; j < patternList[i].waitBullet.length; j++ )
　{
　patternList[i].waitBullet[j].StartSlide();
　moveBullet.push( patternList[i].waitBullet[j] );
　}
　patternList.splice( i, 1 );
　}
　}
　// 移动
　if ( moveBullet.length > 0 )
　{
　for ( i = moveBullet.length - 1; i >= 0; i-- )
　{
　//
　if ( moveBullet[i].slideFlag )
　{
　moveBullet[i]._xx += Math.cos( moveBullet[i].slideAngle * Math.PI / 180 ) * moveBullet[i].slideSpeed;
　moveBullet[i]._xy += Math.sin( moveBullet[i].slideAngle * Math.PI / 180 ) * moveBullet[i].slideSpeed;
　moveBullet[i].x = moveBullet[i]._xx;
　moveBullet[i].y = moveBullet[i]._xy;
　if ( moveBullet[i].slideSpeed > 0 )
　{
　moveBullet[i].slideSpeed -= moveBullet[i].slideSpeedMax / 50;
　if ( moveBullet[i].slideSpeed < 0 ) moveBullet[i].slideFlag = false;
　}
　}else
　{
　moveBullet[i]._xx += Math.cos( moveBullet[i].moveAngle * Math.PI / 180 ) * 1;
　moveBullet[i]._xy += Math.sin( moveBullet[i].moveAngle * Math.PI / 180 ) * 1;
　moveBullet[i].x = moveBullet[i]._xx;
　moveBullet[i].y = moveBullet[i]._xy;
　if ( moveBullet[i].x < -50 || moveBullet[i].x > stage.stageWidth + 50 || moveBullet[i].y < -50 || moveBullet[i].y > stage.stageHeight + 50 )
　{
　removeChild( moveBullet[i] );
　moveBullet.splice( i, 1 );
　}
　}
　}
　}
　}
　private function MouseDown(event:MouseEvent):void
　{
　// 小星
　patternList.push( new Pattern(stage.stageWidth / 2, stage.stageHeight / 2, false, 50, 0xFF5555, (270 + 72 * 0), 3 ) );
　patternList.push( new Pattern(stage.stageWidth / 2, stage.stageHeight / 2, false, 50, 0xFF5555, (270 + 72 * 1), 3 ) );
　patternList.push( new Pattern(stage.stageWidth / 2, stage.stageHeight / 2, false, 50, 0xFF5555, (270 + 72 * 2), 3 ) );
　patternList.push( new Pattern(stage.stageWidth / 2, stage.stageHeight / 2, false, 50, 0xFF5555, (270 + 72 * 3), 3 ) );
　patternList.push( new Pattern(stage.stageWidth / 2, stage.stageHeight / 2, false, 50, 0xFF5555, (270 + 72 * 4), 3 ) );
　// 大星
　patternList.push( new Pattern(stage.stageWidth/2, stage.stageHeight/2, false, 100, 0x5555FF, (270 + 72 * 0), 5 ) );
　patternList.push( new Pattern(stage.stageWidth/2, stage.stageHeight/2, false, 100, 0x5555FF, (270 + 72 * 1), 5 ) );
　patternList.push( new Pattern(stage.stageWidth/2, stage.stageHeight/2, false, 100, 0x5555FF, (270 + 72 * 2), 5 ) );
　patternList.push( new Pattern(stage.stageWidth/2, stage.stageHeight/2, false, 100, 0x5555FF, (270 + 72 * 3), 5 ) );
　patternList.push( new Pattern(stage.stageWidth/2, stage.stageHeight/2, false, 100, 0x5555FF, (270 + 72 * 4), 5 ) );
　}
　}
　}
　//////////////////////////////////////////////////////////////////////
　//////////////////////////////////////////////////////////////////////
　import flash.display.Sprite;
　import flash.geom.Point;
　//-----------------------------
　// 图案类
　class Pattern {
　private var reverse:Boolean = false;
　private var starSize:Number = 150;
　private var bulletColor:uint = 0x000000;
　private var slideAngle:Number = 0;
　private var slideSpeed:Number = 0;
　private var end:Boolean = false;
　private var count:int = 0;
　private var defX:int = 0;
　private var defY:int = 0;
　private var target:Array = new Array();
　private static const PATH_OBJ_NUM:int = 20; // 子弹数
　private static const TARGET_NUM:int = 5;
　private static const TARGET_ANGLE:Array = [ 270 + 72 * 3, 270 + 72 * 1, 270 + 72 * 4, 270 + 72 * 2, 270 ]; // 通过的目标地点的角度
　private static const TARGET_ANGLE2:Array = [ 270 + 72 * 2, 270 + 72 * 4, 270 + 72 * 1, 270 + 72 * 3, 270 ]; //
　public var waitBullet:Array = new Array();
　public function Pattern(
　_gx:int = 0, _gy:int = 0,
　_rev:Boolean = false,
　_starSize:Number = 80,
　_bulletColor:uint = 0x000000,
　_slideAngle:Number = 0,
　_slideSpeed:Number = 0
　) {
　count = 0;
　defX = _gx;
　defY = _gy;
　reverse = _rev;
　starSize = _starSize;
　bulletColor = _bulletColor;
　slideAngle = _slideAngle;
　slideSpeed = _slideSpeed;
　for ( var i:int = 0; i < 5; i++ )
　{
　var angle:Number = TARGET_ANGLE[i];
　if ( reverse ) angle = TARGET_ANGLE2[i] + 180; // 反転
　else angle = TARGET_ANGLE[i];
　target[i] = new Point( Math.cos( angle * Math.PI / 180 ) * starSize, Math.sin( angle * Math.PI / 180 ) * starSize );
　}
　}
　//子弹生成
　public function Run() : Bullet {
　var bullet:Bullet = new Bullet(bulletColor,slideAngle,slideSpeed);
　var targetNo:int = int(count / PATH_OBJ_NUM);
　var targetRate:int = int(count % PATH_OBJ_NUM);
　var p:Point;
　//子弹的座标
　p = Point.interpolate( target[targetNo], target[(targetNo+(TARGET_NUM-1))%TARGET_NUM], targetRate / PATH_OBJ_NUM );
　bullet.x = p.x + defX;
　bullet.y = p.y + defY;
　bullet._xx = p.x + defX;
　bullet._xy = p.y + defY;
　//子弹的移动角度
　//if( !reverse ) bullet.moveAngle = -count / PATH_OBJ_NUM / TARGET_NUM * 720 + 135;
　//else bullet.moveAngle = count / PATH_OBJ_NUM / TARGET_NUM * 720 - 135;
　bullet.moveAngle = ( -int(count / PATH_OBJ_NUM) / TARGET_NUM * 720 + 108) + ((count % PATH_OBJ_NUM) * 180 / PATH_OBJ_NUM); // Target始点角度 + 180 * rate グレイソーに入る前の奴
　waitBullet.push( bullet );
　count++;
　if ( count == TARGET_NUM * PATH_OBJ_NUM ) end = true;
　return bullet;
　}
　public function isEnd() : Boolean { return end; }
　}
　//-----------------------------
　// 子弹类
　class Bullet extends Sprite {
　public var slideFlag:Boolean = false;
　public var slideAngle:Number = 0;
　public var slideSpeed:Number = 0;
　public var slideSpeedMax:Number = 0;
　public var moveAngle:Number = 0;
　public var _xx:Number = 0;
　public var _xy:Number = 0;
　public function Bullet(color:uint,_slideAngle:Number = 0,_slideSpeed:Number = 50) {
　super();
　graphics.beginFill(color);
　graphics.drawCircle(0, 0, 5);
　graphics.endFill();
　graphics.beginFill(0xFFFFFF, 0.5);
　graphics.drawCircle(0, 0, 3);
　graphics.endFill();
　slideAngle = _slideAngle;
　slideSpeed = _slideSpeed;
　slideSpeedMax = _slideSpeed;
　slideFlag = false;
　}
　public function StartSlide():void
　{
　slideFlag = true;
　}
　}