How to create a Collisions var in the Back class - actionscript-3

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
}
}
}