Help! How to Create Wall Barrier for Maze Game

Question

Hi - I'm working on a simple maze program that has ball which is controlled by the up, down. left, right arrow keys.  I made a maze image in Photoshop and brought it into the Flash CS6 and CC (AS3). I made one wall barrier called wallDet1_mc to test before creating other wall barriers. It doesn't work. The ball goes through the wall everytime I test it.  Any help on this would be greatly appreciated.  If anyone has a basic maze with arrow keys control where their object do not cross over the wall please let me know how to do this. Thanks.

Answer 1

Still doesn't work, and I was working on it and I cannot get the object (carP_mc) to not go through the wall. There has to be a code or math equation to stop it from doing this.  If the wall detection picks up the car at the wall then it should keep it away by the same amount of pixels.  What do you think?  Below is a revamped program and thanks again for your help:
import flash.events.KeyboardEvent;
stop();
/* Move with Keyboard Arrows
Allows the specified symbol instance to be moved with the keyboard arrows.
Instructions:
1. To increase or decrease the amount of movement, replace the number 5 below with the number of pixels you want the symbol instance to move with each key press.
Note the number 5 appears four times in the code below.
wallDet1_mc.enabled= false;
var upPressed:Boolean = false;
var downPressed:Boolean = false;
var leftPressed:Boolean = false;
var rightPressed:Boolean = false;
carP_mc.addEventListener(Event.ENTER_FRAME, fl_MoveInDirectionOfKey_3);
stage.addEventListener(KeyboardEvent.KEY_DOWN, fl_SetKeyPressed_3);
stage.addEventListener(KeyboardEvent.KEY_UP, fl_UnsetKeyPressed_3);
stage.addEventListener(Event.ENTER_FRAME, everyFrame);
function fl_MoveInDirectionOfKey_3(event:Event)
    if (upPressed)
        carP_mc.y -= 5;
    if (downPressed)
        carP_mc.y += 5;
    if (leftPressed)
        carP_mc.x -= 5;
    if (rightPressed)
        carP_mc.x += 5;
function fl_SetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = true;
            break;
        case Keyboard.DOWN:
            downPressed = true;
            break;
        case Keyboard.LEFT:
            leftPressed = true;
            break;
        case Keyboard.RIGHT:
            rightPressed = true;
            break;
function fl_UnsetKeyPressed_3(event:KeyboardEvent):void
    switch (event.keyCode)
        case Keyboard.UP:
            upPressed = false;
            break;
        case Keyboard.DOWN:
            downPressed = false;
            break;
        case Keyboard.LEFT:
            leftPressed = false;
            break;
        case Keyboard.RIGHT:
            rightPressed = false;
            break;
function everyFrame(event:Event):void {
var mazehit:Boolean = false;
if (upPressed) {
//for(var i:int = 0; i < speed; i++) {
if(carP_mc.hitTestObject(wallDet1_mc)) {
carP_mc.y -= 5;
mazehit = true;
//break;
if (downPressed) {
//for(var i:int = 0; i < speed; i++) {
if(carP_mc.hitTestObject(wallDet1_mc)) {
carP_mc.y += 5;
mazehit = true;
//break;
if (leftPressed) {
//for(var i:int = 0; i < speed; i++) {
if(carP_mc.hitTestObject(wallDet1_mc)) {
carP_mc.x -= 5;
mazehit = true;
//break;
if (rightPressed) {
//for(var i:int = 0; i < speed; i++) {
if(carP_mc.hitTestObject(wallDet1_mc)) {
carP_mc.x += 5;
mazehit = true;
//break;
//End of program. Not using the codes below
/**onClipEvent(enterFrame){
    if(this.hitArea(carP_mc._x,carP_mc._y, true)){                   
        carP_mc._x=carP_mc._x;
        carP_mc._y=carP_mc._y;
//Keyboard Listener on stage
//stage.addEventListener(KeyboardEvent.KEY_DOWN, theKeysDown);
//stage.addEventListener(KeyboardEvent.KEY_UP, theKeysUp);
//Makes MazeArt follow the movement of the path_mc
/*addEventListener(Event.ENTER_FRAME, onNewFrame01);
function onNewFrame01(e:Event):void{
    maze_mc.x=wallDet1_mc.x;
    maze_mc.y=wallDet1_mc.y
function Car_P(e:KeyboardEvent):void
    //maze_mc.addEventListener(KeyboardEvent, wallDet1_mc);
    //wallDet1_mc.addEventListener(KeyboardEvent.KEY_DOWN, maze_mc);