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kglad Thank you very much! 
In this part of the game I add fly characters to a random position on stage. they are tweened and animated. I didt want them to overlap, so I had to add a collision test and add a placeholder to the final position (my Bitmap) so the gap doesnt get caught away while tweening.
The hitDetection calculates till it finds a free spot, and i think theres the problem. I loop it as long as i would hit another Object. The less characters are on screen yet, the less propable it is to hit and the less often the loop repeats.
The Game crashes after adding about 15 Characters, I get an error from the checkCollision() function. The screen isnt that filled after 15 characters, so it shouldnt be so hard to calculate another free spot.
//adds fly every 2 seconds, turns them and puts the Bitmap on the final position
function addFlies(event:TimerEvent):void{
var fly:Fly = new Fly();
var flySprite:Sprite;
addChild(fly);
fly.setRandomStart();
flySprite = createSprite(fly);
addChild(flySprite);
addChild(fly);
fly.x = flySprite.x = fly.getStart().x;
fly.y = flySprite.y = fly.getStart().y;
flySprite.width *= scaleDown;
flySprite.height *= scaleDown;
flySprite.visible = true;
fly.addEventListener(MouseEvent.MOUSE_DOWN, deleteFlyContainer(fly.getID())); // adds Fly to Array
do{
fly.setRandomEnd();
flySprite.rotation = fly.turn();
flySprite.x = fly.getEnd().x;
flySprite.y = fly.getEnd().y;
}
while(checkCollision(flySprite));
tweenFlies(fly);
fliesArray.push([fly,flySprite]);
//trace(fly.getID());
}
//Checks Collision of new Character and already added Characters
function checkCollision(flySprite:Sprite):Boolean{
var newFly:Bitmap = (Bitmap(flySprite.getChildAt(0)));
var newPoint:Point = new Point();
var oldFly:Bitmap;
var oldPoint:Point = new Point();
var collision:Boolean = false;
newPoint.x = flySprite.x;
newPoint.y = flySprite.y;
for(var i:int = 0;i < fliesArray.length;i++){
oldPoint.x = fliesArray[1].x;
oldPoint.y = fliesArray[1].y;
oldFly = (Bitmap(fliesArray[1].getChildAt(0)));
if(newFly.bitmapData.hitTest(newPoint,255,oldFly.bitmapData,oldPoint,255))
collision = true;
}
return collision;
}
//creates Sprite/Bitmap of Character
function createSprite(fly:Fly):Sprite{
var bounds:Rectangle = fly.getBounds(this); // gets Bounds of Fly in a Rectangle
var flyBmpData = new BitmapData(bounds.width,bounds.height,true,0)
var flyOffset:Matrix = fly.transform.matrix;
flyOffset.tx = fly.x - bounds.x;
flyOffset.ty = fly.y - bounds.y;
flyBmpData.draw(fly,flyOffset);
var flyBmp = new Bitmap(flyBmpData);
var flySprite:Sprite = new Sprite();
flySprite.addChild(flyBmp);
flyBmp.x -= flyBmp.width/2;
flyBmp.y -= flyBmp.height/2;
return flySprite;
}
//Tweens Characters
function tweenFlies(fly:Fly):void{
TweenLite.to(fly, fly.tweenTime(200),{x:fly.getEnd().x, y:fly.getEnd().y, scaleX: scaleDown, scaleY: scaleDown, ease: Quad.easeOut, onComplete: wait(fly)});
}
Thank You for reading threw this! It was such a struggle for me to make the Collisiontest with bitmapdata possible, that my solution is very inefficient and the rerolling takes too much cpu...
Thanks for every tipp you have!!
Megaloadon
is there a way to draw the Bitmap of my movieclip with registration point in center, so i can easyly reach the bitmapdata and dont have problems with scaling etc. Isnt there a simpler way to get the Bitmapdata than my 1000 transformations way?
thanks for your help
It was the scaling... I scaled the Sprite and the Bitmap, but while drawing the BitmapData it was original size. Thats why it always crashed after exact 15 flies no matter how big I scaled them. I simply fixed it by scaling the Fly before drawing the Bitmap. With a scale of 0,2 i can easyly bring 100 flies to stage.
So the whole program runs right now! Can I prevent crashing with a try-catch in that case?
Anyways I still wonder how the transition matrix works. I found some threads on the Internet on changing the registrationpoint of an object without putting it in a sprite or something. they used the transformationmatrix for that, but it didnt work for me.
if i want the bitmap not in a sprite and with registration in cente, how would I do that?
PS: In the old Version for fly 15 the check collision function was called about 50.000 times till it found a free spot, so its no wonder that it chrashed huh? 
EDIT:
I took a screenshot so you know what im talking about. The marked Fly is the Placeholder(bitmap) for the incoming fly on the bottom-left of the screenshot. on the bottom-right, the fly reached the endposition. You can still see the Movieclip beneath... normally theyre turned invisible! The Flies just shouldnt touch/overlapp on stage. Thats all I want
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