Problem with Game states using ISTATE
I am studying Lee Brimelow's approach to game states. In his tutorials he uses an Interface and then create different classes for each of the game states. In my case, I am using the following game states:
- MainMenu - The main screen where the user first enters the app.
- Game - Where the user plays the game.
- Transition - This is where the game ends and the user's results are presented (score, bonus points etc.)
The problem I am having is that when I trace the current game state, it says that I am in the Transition state or [object Transition] when I should be in the MainGame state. In my init function in the MainGame class I specifically set the initial state to be the MainGame class with statement, changeState(MAIN_MENU_STATE);. FYI, I am using Starling so the first class initiates the Starling object. I've also color coded each class in blue.Any thoughts on what I'm doing wrong? Below is the code:
Starling Initiation
package
{
import flash.display.Sprite;
import starling.core.Starling;
[SWF (width= "1024", height = "768", framerate = "60", backgroundColor ="0xffffff")]
public class BB extends Sprite
{
private var myStarling:Starling;
public function BB()
{
//stage.scaleMode = StageScaleMode.NO_SCALE;
//stage.align = StageAlign.TOP_LEFT;
myStarling = new Starling (MainGame, stage);
myStarling.antiAliasing = 1;
myStarling.start();
myStarling.showStats = true;
}
}
}
MainGame Code
package
{
import interfaces.IState;
import starling.display.Sprite;
import starling.events.Event;
import states.MainMenu;
import states.Play;
import states.Transition;
public class MainGame extends Sprite
{
//3 constants for the 3 different game states
public static const MAIN_MENU_STATE:int = 0;
public static const PLAY_STATE:int = 1;
public static const TRANSITION_MENU_STATE:int = 2;
private var current_state:IState;
//private var backgroundMain:Image;
public function MainGame()
{
Assets.init();
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
changeState(MAIN_MENU_STATE);
addEventListener(Event.ENTER_FRAME, update);
}
//changes the state of the game. changeState Looks at what is passed in and creates a new instant of the current state.
public function changeState(state:int):void
{
if (current_state != null)
{
current_state.destroy();
current_state=null;
}
switch (state)
{
case MAIN_MENU_STATE:
current_state = new MainMenu(this);
case PLAY_STATE:
current_state = new Play(this);
case TRANSITION_MENU_STATE:
current_state = new Transition(this);
}
//adds the current state. Cast in sprite because current_state is of type IState
addChild(Sprite(current_state));
}
//call the update method of whatever state is currently active
private function update():void
{
current_state.update();
trace(current_state);
}
}
}
ISTATE Code
package interfaces
{
public interface IState
{
function update():void;
function destroy():void;
}
}
MainMenu CODE
package states
{
import interfaces.IState;
import starling.display.Image;
import starling.display.Sprite;
import starling.events.Event;
public class MainMenu extends Sprite implements IState
{
private var game:MainGame;
public function MainMenu(game:MainGame)
{
this.game = game;
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
trace("This is working!");
}
public function update():void
{
}
public function destroy():void
{
}
}
}
Play Code
package states
{
import interfaces.IState;
import starling.display.Sprite;
import starling.events.Event;
public class Play extends Sprite implements IState
{
private var game:MainGame;
public function Play(game:MainGame)
{
this.game = game;
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
}
public function update():void
{
}
public function destroy():void
{
}
}
}
Transition Code
package states
{
import interfaces.IState;
import starling.display.Sprite;
import starling.events.Event;
public class Transition extends Sprite implements IState
{
private var game:MainGame;
public function Transition(game:MainGame)
{
this.game = game;
addEventListener(Event.ADDED_TO_STAGE, init);
}
private function init(event:Event):void
{
}
public function update():void
{
}
public function destroy():void
{
}
}
}
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