[AS3] Hit Test Object Help

[AnimatedCircle]

Hi ii want my character to walk down the screen and hit the objectWall and then a movieclip then gets added to the stage and plays but it doesnt seem to work and ii dont know why.

import flash.display.MovieClip;

stop();

//1. Set booleans for the status of the arrow presses

var downArrow:Boolean = false;

//2. Add event listeners for the keys

stage.addEventListener(KeyboardEvent.KEY_UP, nokeyHit);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyHit);
stage.addEventListener(Event.ENTER_FRAME, moveObject);

//3. Function to detect if a key has been hit

function keyHit(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.DOWN :
            downArrow = true;
            break;
    }
}

//4. Function to detect if a key has not been hit

function nokeyHit(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.DOWN :
            downArrow = false;
            break;
    }
}

//5. Function to move the object

function moveObject(event:Event):void
{
    var speed:Number = 2;
    if (downArrow)
    {
        objectMove.y +=  speed;
    }
    hitWalls();
}

//6. Function to test hitting the walls

function hitWalls():void
{

    var left:Number = 0;
    var right:Number = stage.stageWidth;
    var top:Number = 0;
    var bottom:Number = stage.stageHeight;


    if (objectMove.x  - (objectMove.width / 2) > right)
    {
        objectMove.x = left - objectMove.width / 2;
    }
    else if (objectMove.x + objectMove.width / 2 < left)
    {
        objectMove.x = right + objectMove.width / 2;
    }

    if (objectMove.y + (objectMove.height / 2) > bottom)
    {
        objectMove.y = bottom - (objectMove.height / 2);
    }
    else if (objectMove.y - (objectMove.height / 2) < top)
    {
        objectMove.y = top + (objectMove.height / 2);
    }
}

objectMove.addEventListener(Event.ENTER_FRAME, testHit);

function testHit(event:Event):void
{
    var Attack:MovieClip = new MovieClip;
    
    if (objectMove.hitTestObject(objectWall))
    {
        objectMove.removeEventListener(Event.ENTER_FRAME, testHit);
        addChild(Attack);
    }
}

Any help would be great.. thank you.

[AnimatedCircle]

Hi ii want my character to walk down the screen and hit the objectWall and then a movieclip then gets added to the stage and plays but it doesnt seem to work and ii dont know why.

import flash.display.MovieClip;

stop();

//1. Set booleans for the status of the arrow presses

var downArrow:Boolean = false;

//2. Add event listeners for the keys

stage.addEventListener(KeyboardEvent.KEY_UP, nokeyHit);
stage.addEventListener(KeyboardEvent.KEY_DOWN, keyHit);
stage.addEventListener(Event.ENTER_FRAME, moveObject);

//3. Function to detect if a key has been hit

function keyHit(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.DOWN :
            downArrow = true;
            break;
    }
}

//4. Function to detect if a key has not been hit

function nokeyHit(event:KeyboardEvent):void
{
    switch (event.keyCode)
    {
        case Keyboard.DOWN :
            downArrow = false;
            break;
    }
}

//5. Function to move the object

function moveObject(event:Event):void
{
    var speed:Number = 2;
    if (downArrow)
    {
        objectMove.y +=  speed;
    }
    hitWalls();
}

//6. Function to test hitting the walls

function hitWalls():void
{

    var left:Number = 0;
    var right:Number = stage.stageWidth;
    var top:Number = 0;
    var bottom:Number = stage.stageHeight;


    if (objectMove.x  - (objectMove.width / 2) > right)
    {
        objectMove.x = left - objectMove.width / 2;
    }
    else if (objectMove.x + objectMove.width / 2 < left)
    {
        objectMove.x = right + objectMove.width / 2;
    }

    if (objectMove.y + (objectMove.height / 2) > bottom)
    {
        objectMove.y = bottom - (objectMove.height / 2);
    }
    else if (objectMove.y - (objectMove.height / 2) < top)
    {
        objectMove.y = top + (objectMove.height / 2);
    }
}

objectMove.addEventListener(Event.ENTER_FRAME, testHit);

function testHit(event:Event):void
{
    var Attack:MovieClip = new MovieClip;
    
    if (objectMove.hitTestObject(objectWall))
    {
        objectMove.removeEventListener(Event.ENTER_FRAME, testHit);
        addChild(Attack);
    }
}

Any help would be great.. thank you.

[TessaLee]

Well... I've noticed that you have two ENTER_FRAME events happening; moveObject and testHit, and moveObject is calling the function hitWalls every frame. I usually don't like having two separate functions for ENTER_FRAME, because whatever they're both doing can most likely be called from the same function that determines the game loop. But I see what you're trying to do here. moveObject is self-explanatory, hitTest is where you're checking for collision, and I believe hitWalls is where you're checking to see if you've hit a wall and are pushing them back from it.

Ok, so try something like this:

import flash.display.MovieClip;

var downArrow:Boolean = false;
var speed:Number = 2;
var left:Number = 0;
var right:Number = stage.stageWidth;
var top:Number = 0;
var bottom:Number = stage.stageHeight;
var Attack:MovieClip = new MovieClip();
var isHit:Boolean = false;//TessaLee added this

stage.addEventListener(KeyboardEvent.KEY_DOWN, keyHit);
stage.addEventListener(KeyboardEvent.KEY_UP, nokeyHit);
stage.addEventListener(Event.ENTER_FRAME, movieLoop);

function keyHit (event:KeyboardEvent):void
{
     switch (event.keyCode)
     {
          case Keyboard.DOWN :
               downArrow = true;
               break;
     }
}
function nokeyHit(event:KeyboardEvent):void
{
     switch (event.keyCode)
     {
          case Keyboard.DOWN :
               downArrow = false;
               break;
     }
}
function movieLoop(event:Event)
{
     if(downArrow == true)
     {
          objectMove.y += speed;  //Moves the object
          hitWalls();  //Collision Check
          if(isHit == false)  //Will only be true if we hit the test object
          {
               testHit();  //Collision Check
          }
     }
}
function hitWalls()
{
     //Put all of your if and else if statements for the function here
}
function testHit()
{
     if(objectMove.hitTestObject(objectWall))
     {
          isHit = true; //No longer runs this function in the movie loop
          //You can also disable the entire movie loop if you don't need to control movement anymore by doing what you did before with removing the entire listener.
          addChild(Attack);
     }
}

I hope this helps (:

[TessaLee]

Aside from all of the code suggestion I just made, I noticed that you're missing the parenthesis when declaring a new MovieClip variable. Should be like this:

var Attack:MovieClip = new MovieClip();

Take care!