package {
     
    import flash.display.Sprite;
    import flash.display.StageAlign;
    import flash.display.StageScaleMode;
    import flash.events.Event;
     
    public class SeekFleeTest2 extends Sprite {
         
        private var _vehicleA:SteeredVehicle;
        private var _vehicleB:SteeredVehicle;
        private var _vehicleC:SteeredVehicle;
         
        public function SeekFleeTest2() {
             
            stage.align=StageAlign.TOP_LEFT;
            stage.scaleMode=StageScaleMode.NO_SCALE;
            _vehicleA=new SteeredVehicle(0xff0000)  ;
            _vehicleA.position=new Vector2D(stage.stageWidth*Math.random(),stage.stageHeight*Math.random());
            _vehicleA.edgeBehavior=Vehicle.BOUNCE;
            addChild(_vehicleA);
             
            _vehicleB=new SteeredVehicle(0x0000ff)  ;
            _vehicleB.position=new Vector2D(stage.stageWidth*Math.random(),stage.stageHeight*Math.random());
            _vehicleB.edgeBehavior=Vehicle.BOUNCE;
            addChild(_vehicleB);
             
            _vehicleC=new SteeredVehicle(0x00ff00)  ;
            _vehicleC.position=new Vector2D(stage.stageWidth*Math.random(),stage.stageHeight*Math.random());
            _vehicleC.edgeBehavior=Vehicle.BOUNCE;
            addChild(_vehicleC);
             
            addEventListener(Event.ENTER_FRAME,onEnterFrame);
        }
         
        private function onEnterFrame(event:Event):void {
             
            //A追求B，躲避C
            _vehicleA.seek(_vehicleB.position);
            _vehicleA.flee(_vehicleC.position);         
             
            //B追求C，躲避A
            _vehicleB.seek(_vehicleC.position);
            _vehicleB.flee(_vehicleA.position);
             
            //C追求A，躲避B
            _vehicleC.seek(_vehicleA.position);
            _vehicleC.flee(_vehicleB.position);
             
            _vehicleA.update();
            _vehicleB.update();
            _vehicleC.update();
        }
    }
}