You never store passed stage reference in shipLasers
class, thus you are trying to refer its own built-in stage ref, which is likely null because your instances of shipLasers
don't get added to display list themselves. You need to store the stage ref passed in the constructor and use that to add children.
public class shipLasers ... {
var theStage:Stage;
public function shipLasers(aStage:Stage){
theStage = aStage;
}
public function Emit(...) {
...
theStage.addChild(tempLaserRight);
thestage.addChild(tempLaserLeft);
}
}
Update: It's also a good practice to first check stage availability, then use stage reference. To do this, you need to listen to Event.ADDED_TO_STAGE
event in your ship class, as it uses stage left right and center. The common code of achieving this is as follows:
public function PlayerShip() {
....
// leave here only code that does not require stage
if (stage) init(); else addEventListener(Event.ADDED_TO_STAGE,init);
}
private function init(e:Event=null):void {
removeEventListener(Event.ADDED_TO_STAGE,init);
// here place all code that's left from your initialization process
laserEmitter=new shipLasers(stage);
stage.addEventListener(KeyboardEvent.KEY_DOWN, movementKeysDown);
stage.addEventListener(KeyboardEvent.KEY_UP, movementKeysUp);
// etc.
}