how to repeatedly duplicate mc with AS3

your code is problematic, if it executes more than once:

karta1Sprite=new karta1Class();

//you have duplicate objects named karta1Sprite.  

akceb = hraKartyKontejner.addChild(karta1Sprite);

// akcep = karta1Sprite, so this accomplishes nothing more than: hraKartyKontejner.addChild(karta1Sprite);

// the last created karta1Sprite is the only one able to be referenced by karta1Sprite (and/or akcep).

akceb.addEventListener(Event.ENTER_FRAME, vyvolejPostavu);

/* compounds the problem by repeatedly adding the same listener to the last created karta1Sprite. ie, if your shown code executes twice, you expect exactly the problem you described.  if it executes 10 times, the last karta1Sprite will move 10 x rychlost and the others will not move */

function vyvolejPostavu(e:Event):void
{

//character shift
akceb.x = akceb.x+rychlost;

// again, akceb is the last created karta1Sprite.
}

you're not going to get much performance benefit by pooling or using an array or using one enterframe loop unless there are more than 10**5 characters.

but using those things will help you keep organized.  but so will using a class file for kart1Class and generally is easier to maintain and debug.

Hi.

I recommend you to add only one enterFrame listener. Something like this:

import flash.display.DisplayObject;
import flash.events.Event;
import flash.events.MouseEvent;

var spawned:Vector.<YourLibSymbol> = new Vector.<YourLibSymbol>();

function spawn(e:MouseEvent):void
{
	var instance:YourLibSymbol = new YourLibSymbol();
	
	instance.vX = 10;
	addChild(instance);
	spawned.push(instance);
}

function enterFrameHandler(e:Event):void
{
	var i:int;
	
	for (i = spawned.length - 1; i > -1; i--)
		spawned[i].x += spawned[i].vX;
}

yourButton.addEventListener(MouseEvent.CLICK, spawn);
stage.addEventListener(Event.ENTER_FRAME, enterFrameHandler);

If you want to improve performance event further, consider using object pooling.

Regards,

JC

 isn't easy to see what is wrong. Is there a way to can upload the files for us to rtry?