How to create a Collisions var in the Back class

Question

Edit: I have now included a Player.as and a addchild

I've been trying to understand how to do this all day and again learned a lot in doing so. But I've come to a point that i need help.

I know I have to do this: create a Collisions var in the Back1 class.

Because the background called Back1 is the movieclip that contains the Collisions image

I found a good site or 2 that does a good job of explaining variables and classes but i still don't get how i should solve this problem

Research after variables and classes:

http://www.republicofcode.com/tutorials/flash/as3variables/

http://www.photonstorm.com/archives/1136/flash-game-dev-tip-1-creating-a-cross-game-communications-structure

the above problem results in the folowing error but i believe it is caused by not creating a Collisions var in the Back1 class

ArgumentError: Error #1063: Argument count mismatch on Bumper(). expected: 2, value 0.

• at flash.display::MovieClip/gotoAndStop() at DocumentClass/onRequestStart()DocumentClass.as:64] at flash.events::EventDispatcher/dispatchEventFunction() at flash.events::EventDispatcher/dispatchEvent() at MenuScreen/onClickStart()MenuScreen.as:18]

  package 
   {
  import flash.display.MovieClip;
  import flash.events.*;
  import flash.events.KeyboardEvent;
  import flash.ui.Keyboard;
  import flash.geom.Point;
  import Bumper;
  //import Back1;
  
  public class Test extends MovieClip
  {
  
      public var leftBumping:Boolean = false;
  public var rightBumping:Boolean = false;
  public var upBumping:Boolean = false;
  public var downBumping:Boolean = false;
  
  public var leftBumpPoint:Point = new Point(-30,-55);
  public var rightBumpPoint:Point = new Point(30,-55);
  public var upBumpPoint:Point = new Point(0,-120);
  public var downBumpPoint:Point = new Point(0,0);
  
  public var scrollX:Number = 0;
  public var scrollY:Number = 500;
  
  public var xSpeed:Number = 0;
  public var ySpeed:Number = 0;
  
  public var speedConstant:Number = 4;
  public var frictionConstant:Number = 0.9;
  public var gravityConstant:Number = 1.8;
  public var jumpConstant:Number = -35;
  public var maxSpeedConstant:Number = 18;
  
  public var doubleJumpReady:Boolean = false;
  public var upReleasedInAir:Boolean = false;
  
  public var keyCollected:Boolean = false;
  public var doorOpen:Boolean = false;
  
  public var currentLevel:int = 1;
  
  public var animationState:String = "idle";
  
  public var bulletList:Array = new Array();
  public var enemyList:Array = new Array();
  public var bumperList:Array = new Array();
   public var back1:Back1;
  public var collisions:Collisions;
  //public var back1:Collisions = new Collisions ;
   public var player:Player;
  
  public function Test()
  {
      addEventListener(Event.ADDED_TO_STAGE, init);
  }
  
  public function init(e:Event):void
  {
  
      player = new Player(320, 360);
      back1 = new Back1();
      collisions = new Collisions();
      //back1.collisions = new Collisons();
            addBumpersToLevel1();
  }
  public function addBumpersToLevel1():void
  {
      addBumper(500, -115);
      addBumper(740, -115);
  }
          public function addPlayerTolevel1():void 
  {
      addPlayer(320, 360);
  }
  public function loop(e:Event):void
  {
      trace("back1.collisions "+back1.collisions);
                  trace("back1 "+back1);
                  trace("collisions "+collisions);
      if (back1.collisions.hitTestPoint(player.x + leftBumpPoint.x,player.y + leftBumpPoint.y,true))
      {
  

just in case i've added Bumper.as

package  {
import flash.display.MovieClip;
import flash.events.Event;

public class Bumper extends MovieClip{
    public function Bumper(xLocation:int, yLocation:int) {
        // constructor code
        x = xLocation;
        y = yLocation;

        addEventListener(Event.ENTER_FRAME, bumper);
    }

    public function bumper(e:Event):void{
        //code here
    }
}

}

Player.as

 package  {
    import flash.display.MovieClip;
    import flash.events.Event;

    public class Player extends MovieClip {

        public function Player(xLocation:int, yLocation:int) {
            // constructor code
            x = xLocation;
            y = yLocation;
           }



     //   public function removeSelf():void {
      //      trace("remove enemy");
       //     removeEventListener(Event.ENTER_FRAME, loop);
       //     this.parent.removeChild(this);
       // }



 }
 }

the Back1.as file (note it's got to be instanced wrong)

package  {
import flash.display.MovieClip;


public class Back1 extends MovieClip {
    //public var collisions:Back1;
           //what should i put here?
}
}

Answer 1

I am not sure I understand completely what you mean. The question is phrased strange.

I assume you want to achieve a collision between your background object (The Back class) and a player object? I can't see from the code you have posted what the player object is since there is no such variable in your Test class.

To test a collision check between two objects use the following code:

if(someObject.hitTestObject(anotherObject))

Or in your case when using hitTestPoint:

if(back1.hitTestPoint(player.x, player.y,true))

Then again I don't know from the code you have posted how the back1 class looks like. If it extends a MovieClip or Sprite and you have a Player class that does the same (OR any DisplayObject) this should work.

This: Argument count mismatch on Bumper(). expected: 2, value 0.

The error you get seems to come from another place not shown in your code. I would assume you did not pass any parameters into the Bumper class' constructor.

Btw, is this a Flash IDE sample or some other program such as FlashDevelop or FlashBuilder? If you are using the Flash IDE and are trying to attach code to a movie clip instance placed out on the scene I don't think its possible to pass parameters to it. Sorry been a while since I've worked in the Flash IDE.

EDIT:

Here's some sample code:

//::  Change Back1 class to this

package  {
import flash.display.MovieClip;


public class Back1 extends MovieClip {
    public function Back1()
    {
        graphics.beginFill(0xFF0000);
        graphics.drawRect(0, 0, 50, 50);
        graphics.endFill();
    }
}
}


//::  Then in your Main class (Or the Test class) add the following

var player:Player = new Player(25, 25);
var collidable:Back1 = new Back1();

addChild(player);
addChild(collidable);

//::  Goes in your loop/update
if (collidable.hitTestPoint(player.x, player.y, true))
{
    trace("HIT PLAYER");
}

How you apply the graphics to the Back1 class is up to you, I just drew a simple box. It could be anything.

Answer 2

Set default parameters for Bumper class:

package  {
    import flash.display.MovieClip;
    import flash.events.Event;

    public class Bumper extends MovieClip{
        public function Bumper(xLocation:int = 0, yLocation:int = 0) {
            // constructor code
            x = xLocation;
            y = yLocation;

            addEventListener(Event.ENTER_FRAME, bumper);
        }

        public function bumper(e:Event):void{
            //code here
        }
    }

    }