ActionScript 3.0 :: Problem With Hit Detection/looping Through Array
Oct 14, 2011
Hey guys, thanks in advance for any help, I'd be stuck all the time without these forums.
I have a custom class(Ball) and a .FLA. Ignore the custom class, it works fine, having a problem within my main FLA.
I'm getting repeated "Error #1009: Cannot access a property or method of a null object reference. at Environment_fla::MainTimeline/hitTest()".
I understand that this error means I'm asking it to reference something that's no longer there. I just can't figure out why I'm getting it, and how better to hitTest many objects in an array.
My game involves creating a bunch of balls that will fall into buckets. I need to keep track of how many touched the buckets, how many fell off the screen, and remove each accordingly.
Thanks again, very much appreciated.
Here is the code from my main FLA
[as]var ballTimer:Timer = new Timer(200);
var changeTimer:Timer = new Timer(50000);
ballTimer.addEventListener(TimerEvent.TIMER, throwBall, false, 0, true);
ballTimer.start();
changeTimer.addEventListener(TimerEvent.TIMER, changeColor);
changeTimer.start();
//Environment variables
var gravity:int = 1.5;
var friction:Number = .85;
var color:int = 2;
//score variables
var YellowScore:int = 0;
var BlackScore:int = 0;
var tBall:Ball = new Ball(new Point(mouseX, mouseY), new Point(Math.random() + Math.random()*5 + Math.random()*8), gravity, friction);
var ballArray:Array = new Array();
function throwBall(e:TimerEvent):void {
var tBall:Ball = new Ball(new Point(mouseX, mouseY), new Point(Math.random() + Math.random()*5 + Math.random()*8), gravity, friction);
tBall.addEventListener(Event.ENTER_FRAME, hitTest);
tBall.gotoAndStop(color);
addChild(tBall);
ballArray.push(tBall);
}
function changeColor(e:TimerEvent):void {
if (color == 1) {
color = 2;
return;
}
if (color == 2) {
color = 1;
}
}
function hitTest(e:Event) {
trace(ballArray.length);
for (var i = 0; i < ballArray.length - 1 ; i++) {
if ((ballArray[i].hitTestObject(YellowBucket1) && ballArray[i].currentFrame == 2)) {
YellowScore += 1; //trace(YellowScore); trace("Space");
ballArray[i].parent.removeChild(ballArray[i]);
ballArray.shift();
break;
}
else if ((ballArray[i].hitTestObject(YellowBucket1) && ballArray[i].currentFrame == 1)) {
YellowScore -= 1;
}
else if ((ballArray[i].hitTestObject(BlackBucket1) && ballArray[i].currentFrame == 2)) {
BlackScore -= 1;
}
else if ((ballArray[i].hitTestObject(BlackBucket1) && ballArray[i].currentFrame == 1)) {
BlackScore += 1; trace("BlackScore");
}
else if (ballArray[i].y > stage.stageHeight || ballArray[i].x > stage.stageWidth) {
trace("cleanUp");
ballArray[i].parent.removeChild(ballArray[i]);
ballArray.shift();
}
}
updateScore();
}
function updateScore() {
BlackBucket_txt.text = String(BlackScore);
YellowBucket_txt.text = String(YellowScore);
}
[/as]
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I've attached a zip with a few custom classes and a .FLA. Ignore the custom classes. I'm getting repeated
"Error #1009: Cannot access a property or method of a null object reference. at Environment_fla::MainTimeline/hitTest()".
I understand that this error means I'm asking it to reference something that's no longer there. How better to hitTest many objects in an array. My game involves creating a bunch of balls that will fall into buckets. I need to keep track of how many touched the buckets, how many fell off the screen, and remove each accordingly.
Here is the code from my main FLA
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