AS3 - Placing movie clip at specified coordinates

Question

I'm making a top down shooter game as project for a college assignment in which I have very little time left to complete.

I'm trying to get the enemy movieclip to spawn off stage, I have setup a function to create a random number for the x and y position and then stored each in a var, but I cant use the two var's for the coordinates, I get 3 errors:

Main.as, Line 33 1120: Access of undefined property enemy.

Main.as, Line 33 1137: Incorrect number of arguments. Expected no more than 0.

Main.as, Line 34 1120: Access of undefined property enemy.

Lines 33 - 34 Code from Main.as:

enemy = new Enemy(stage, xPos, yPos);
this.stage.addChild(enemy);

The xPos and yPos vars created on lines 18 and 19 respectively:

public var xPos:Number;
public var yPos:Number;

xPos and yPos are given values in the function spawnPos:

public function spawnPos()
    {
        var a:Number = Math.round(Math.random()*5);
        var aNum:Number;

        if (a <= 3)
        {
            aNum = Math.ceil(Math.random()*20) + 640;
            xPos = aNum;
            aNum = Math.ceil(Math.random()*20) + 480;
            yPos = aNum;


        }
        else if (a >= 2)
        {
            aNum = Math.ceil(Math.random()*-20) + 0;
            xPos = aNum;
            aNum = Math.ceil(Math.random()*-20) + 0;
            yPos = aNum;
        }
    }

And the spawnPos function is declared to run on line 32 just before the enemy is created:

spawnPos();

Help would be greatly appreciated, many thanks and hope all is having a great start to the new year. :)

Answer 1

Fixed and working

Small changes were made to both the Main.as and Enemy.as as follows:

---

Main.as

The changes made here were to the statement of defining the enemy. It was

enemy = new Enemy(stage, xPos, yPos);

I removed the stage argument but kept the two variables xPos and yPos and made it a variable.

var enemy:Enemy = new Enemy(xPos, yPos);

I also removed where I called the spawnPos() function.

---

Enemy.as

I moved the spawnPos() function from Main.as to here and called it in the constructor code so it's only run when the enemy varible is.

I then amended the class definition and added the arguments I wanted to be passed

public function Enemy(xPos : Number, yPos : Number)

---

Answer 2

Maybe you're missing the Enemy class. Create an Enemy class with 3 arguments. Then after the line with this.stage.addChild(enemy); you must add:

enemy.x = enemy.xPos;
enemy.y = enemy.yPos;

I'm considering that the Enemy class extends Sprite or MovieClip class and xPos and yPos have an get/set.

edit

class Enemy extends Sprite 
{
    private var _xPos:Number;
    private var _yPos:Number;

    public function Enemy(/*your params here*/)
    {
        //your code here
    }

    //xPos setter
    public function set xPos(value:Number):void 
    {
        this._xPos = value;
    }

    //xPos getter
    public function get xPos():Number
    {
        return this._xPos;
    }

    //yPos setter
    public function set yPos(value:Number):void 
    {
        this._yPos = value;
    }

    //yPos getter
    public function get yPos():Number
    {
        return this._yPos;
    }
}

edit 2

If you want to store the object's position, you don't have to use xPos or yPos. Sprite and Movieclip have x and y. "Don't recreate the wheel" ;)