How do I add Child when two instances collide? - actionscript-3

Question

I'm trying to create a virtual life simulation, where when a boy fish and a girl fish collide they reproduce. This is my first time using external class files and I'm quite confused.
package {
import flash.display.MovieClip;
import flash.events.Event;
public class Main extends MovieClip
{
var numBalls:Number = 3;
var bFishList:Array = new Array();
var gFishList:Array = new Array();
public static var bFish:BoyFish = new BoyFish ;
public static var gFish:GirlFish = new GirlFish ;
var fishName:Object = bFish.name;
public function Main()
{
addEventListener(Event.ADDED_TO_STAGE, enterFrameNow);
function enterFrameNow(event:Event):void {
// constructor code
for (var i = 0; i < numBalls; i++) {
var bFish:MovieClip = new BoyFish();
bFish.name = "bFish"+i;
addChild(bFish);
//variable ball a movieclip is a new instance of Ball
var gFish:MovieClip = new GirlFish();
// ball x and y value was in the middle of the stage
bFish.x = stage.stageWidth / 2;
bFish.y = stage.stageHeight / 2;
// add ball to stage
bFishList.push(bFish);
// ball x and y value was in the middle of the stage
gFish.x = stage.stageWidth / 2;
gFish.y = stage.stageHeight / 2;
// add ball to stage
addChild(gFish);
gFishList.push(gFish);
addEventListener(Event.ENTER_FRAME, hitTest);
function hitTest(event:Event):void {
for (i = 0; i < bFishList.length; i++) {
if (gFish.hitTestObject(bFishList[i]) == true) {
addChild(gFish);
gFishList.push(gFish);
trace("hit");
}
}
}
}
}
trace(bFishList);
trace(gFishList);
}
}
}
Here's the code from my Main.as file. I've tried for so long with the hitTestObject thing, and it's just not working for me.
Can anyone help me? I want it to add another instance to the stage when a bFish and a gFish collide.

Answer 1

You shouldn't add that many enterFrame events.
Add just one enterFrame handler, in your class, not as a local function, and add a nested loop into it.
//Somewhere in your Main() function :
addEventListener(Event.ENTER_FRAME, this.hitTest);
//In class Main
public function hitTest(event:Event):void
{
for (var i = 0; i < bFishList.length; i++)
{
for (var j = 0; j < gFishList.length; j++)
{
if (gFishList[j].hitTestObject(bFishList[i]))
{
var newFish:MovieClip = new GirlFish(); //Create it.
addChild(newFish);
gFishList.push(newFish);
}
}
}
}
Please note that if you aren't doing any more action, that could result of the creation of many girl fish each frame, which could eventually freeze the flashplayer.