Using variable from another class as3 - actionscript-3

Question

i separated one big file into multiple file to have it cleaned and i got a problem now.
I have my main.as, character.as, camera.as.
What i'm trying to do is access a variable from another class which i set later on that class. Ill show you what i mean.
From my main.as im loading each class and add them as child so it get displayed on screen.
public function buildGame()
{
var loadMap:Sprite = new nf_MapBuilder();
var xChar:Sprite = new nf_Character();
var xCam:Sprite = new nf_Camera();
var UserControl:nf_UserControl = new nf_UserControl();
addChild(loadMap);
addChild(xChar);
addChild(xCam);
addChild(UserControl);
}
Everything show on screen like it needed. Then it goes to my character.as:
package as3
{
import flash.display.Sprite;
import flash.events.Event;
public class nf_Character extends Sprite
{
public var character_pos:Array = new Array();
public var character_is_moving:Boolean = false;
public var character_x_dir:int = 0;
public var character_y_dir:int = 0;
public var character:hero = new hero();
public function nf_Character()
{
addEventListener(Event.ADDED_TO_STAGE,xCharLoad);
}
public function xCharLoad(e:Event)
{
character_pos = [2,2];
character.x=64*(character_pos[1]);
character.y=64*(character_pos[0]);
addChild(character);
}
}
}
There is the problem. I need to use those variable i set there in my character.as to use it in my camera.as:
package as3
{
import flash.display.Sprite;
import flash.events.Event;
import flash.geom.Rectangle;
import flash.display.StageScaleMode;
import as3.nf_Character;
public class nf_Camera extends Sprite
{
private var xChar:nf_Character = new nf_Character();
//Camera variables
var stageW2:Number;
var stageH2:Number;
var view:Rectangle;
public function nf_Camera()
{
addEventListener(Event.ADDED_TO_STAGE,xCamGo);
}
public function xCamGo(e:Event):void
{
trace("Camera pos - " + xChar.x + " " + xChar.character.y);
view = new Rectangle(0,0,stage.stageWidth,stage.stageHeight)
stageW2 = stage.stageWidth / 2 - 32;
stageH2 = stage.stageHeight / 2 - 32;
addEventListener(Event.ENTER_FRAME,CamView);
}
public function CamView(e:Event):void
{
view.x = xChar.character.x - stageW2;
view.y = xChar.character.y - stageH2;
scrollRect = view;
}
}
}
When it was all in one big file it was ok i just had to set the variable in the class and acessing it trough every function but now im kinda confused. Anyone see how i could do this?

Answer 1

In short, I think you should subscribe to an event from your character in your main class which is fired whenever the character moves. In the handler for that event you could call a method on the camera to set it's position according to the current position of the character.
main.as
private var xChar:Sprite = new nf_Character();
private var xCam:Sprite = new nf_Camera();
public function buildGame()
{
var loadMap:Sprite = new nf_MapBuilder();
var UserControl:nf_UserControl = new nf_UserControl();
// listen for when the character has moved
xChar.addEventListener(MoveEvent.MOVED, characterMovedHandler);
addChild(loadMap);
addChild(xChar);
addChild(xCam);
addChild(UserControl);
}
private function characterMovedHandler(event:MoveEvent):void
{
xCam.setPosition(xChar.x, xChar.y);
}
nf_Character.as
public class nf_Character extends Sprite
{
public var character_pos:Array = new Array();
public var character_is_moving:Boolean = false;
public var character_x_dir:int = 0;
public var character_y_dir:int = 0;
public var character:hero = new hero();
public function nf_Character()
{
addEventListener(Event.ADDED_TO_STAGE,xCharLoad);
}
public function xCharLoad(e:Event)
{
character_pos = [2,2];
character.x=64*(character_pos[1]);
character.y=64*(character_pos[0]);
addChild(character);
}
public function xCharMoved()
{
// Dispatch a custom event when the character moves
dispatchEvent(new MovedEvent(MovedEvent.MOVED));
}
}
nf_Camera.as
public class nf_Camera extends Sprite
{
private var xChar:nf_Character = new nf_Character();
//Camera variables
var stageW2:Number;
var stageH2:Number;
var view:Rectangle;
public function nf_Camera()
{
addEventListener(Event.ADDED_TO_STAGE,xCamGo);
}
public function xCamGo(e:Event):void
{
trace("Camera pos - " + xChar.x + " " + xChar.character.y);
view = new Rectangle(0,0,stage.stageWidth,stage.stageHeight)
stageW2 = stage.stageWidth / 2 - 32;
stageH2 = stage.stageHeight / 2 - 32;
// Probably only need one enterframe either in your character class or main
//addEventListener(Event.ENTER_FRAME,CamView);
}
public function setPosition(x:Number, y:Number):void
{
view.x = xChar.character.x - stageW2;
view.y = xChar.character.y - stageH2;
scrollRect = view;
}
}
Out of interest, how are you moving the character?

Answer 2

You can pass your character class instance to your camera class instance as an argument of the constructor. You will then have a reference to the character inside the camera class and you can access it's variables
// Inside buildGame() in main.
var xChar:nf_Character = new nf_Character();
var xCam:nf_Camera = new nf_Camera(xChar);
// Inside nf_Camera
public function nf_Camera(char:nf_Character) {
xChar = char;
}