Dan, I was thinking using the tile solution would reduce the amount of
checks as instead of looping through all the brick objects and checking for
a collision using hitTest, I would simply call a function passing in the
balls current position and if this was a tile (brick) that hadn't been
destroyed, it would destroy the brick
So the bricks would be represented by a multidimensional array like so
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
1,1,1,1,1,1,1,1,1,1,1,1,1,1
1,1,1,1,1,1,1,1,1,1,1,1,1,1
1,1,1,1,1,1,1,1,1,1,1,1,1,1
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
0,0,0,0,0,0,0,0,0,0,0,0,0,0
And the method would use the balls x and y position to calculate the tile
row and column
var numTileColumn:Number = passedX / numTileWidth;
var numTileRow:Number = passedY / numTileHeight;
if (map[numTileColumn][numTileRow] == 1) {
// Destroy Brick
}
Hopefully this makes sense. I have just written this code off the top of my
head so haven't implemented it in the game yet
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Holth,
Daniel C.
Sent: 13 December 2006 17:01
To: Flashcoders mailing list
Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple pong type game
>From a computational standpoint, you end up running the same amount of
processses. Are you either haveing the ball constantly checking "Where am
I? Am I over a brick?" or you have the ball checking "Am i hitting
something?" every onEnterFrame.
Pete's suggested having checks when it reaches a vertical threshold, but
again, you just change the the ball from asking "Am I hitting something?" to
"am I over the threshold?" every onEnterFrame, and then add additional
computation to figure out what its hitting.
I like Mike's solution of breaking out of the loop after a collision is
detected becuase then you don't perform unnessary computations (assuming the
ball can only be hitting one thing at a time).
-Dan
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] Behalf Of Paul
Steven
Sent: Wednesday, December 13, 2006 10:36 AM
To: 'Flashcoders mailing list'
Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple pong type
game
Rather than testing every brick for a collision all the time, I was thinking
of using a tile based approach to display the bricks. Therefore rather than
each brick checking for a collision with the ball, it is a case of checking
what tile (brick) the ball currently occupies if any and if that brick has
not yet been destroyed then destroy it...
Hence a multidimensional array would be used to represent the bricks on the
screen.
Haven't implemented this yet but it sounds ok in my head:)
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Pete Miller
Sent: 13 December 2006 16:17
To: Flashcoders mailing list
Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple pong type game
I don't program games (so add that factor as a consideration), it was
just my first thought that if I were doing this, I wouldn't want to test
every object for a collision all the time. If there is a latency issue
such as you describe, a homebrewed Event class might eliminate it.
P.
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:flashcoders-
>> [EMAIL PROTECTED] On Behalf Of slangeberg
>> Sent: Wednesday, December 13, 2006 11:13 AM
>> To: Flashcoders mailing list
>> Subject: Re: [Flashcoders] AS2 OOP Class Structure for simple pong
type
>> game
>>
>> Have you actually implemented an event system like this in games? It
>> seems
>> like a good idea, but for some reason I always thought this approach
>> would
>> introduce unnecessary latency, but now I'm not sure why!
>>
>> -Scott
>>
>> On 12/13/06, Pete Miller <[EMAIL PROTECTED]> wrote:
>> >
>> > Another possible strategy is for the ball to fire off an event
every
>> > time it crosses certain vertical location thresholds. The target
>> > objects could then listen for the event which matches their
vertical
>> > location to test for a collision.
>> >
>> > For example, when the ball descends to the row containing the
paddle,
>> it
>> > fires that event, and the paddle, receiving it, tests for
collision.
>> > When the ball ascends to the first row of bricks, those bricks each
>> test
>> > for collsion. This might be a performance improvement over testing
>> > every object in the system all the time.
>> >
>> > P.
>> >
>> > >> -----Original Message-----
>> > >> From: [EMAIL PROTECTED]
[mailto:flashcoders-
>> > >> [EMAIL PROTECTED] On Behalf Of Holth, Daniel C.
>> > >> Sent: Wednesday, December 13, 2006 9:43 AM
>> > >> To: Flashcoders mailing list
>> > >> Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple
pong
>> > type
>> > >> game
>> > >>
>> > >>
>> > >> That would be one way. Although it is rather limiting. I'm
>> assuming
>> > >> that the ball will bounce whenever it hits an object.
>> > >>
>> > >> Perhaps create an array of bounceObjects[];
>> > >>
>> > >> function addBounceObject(obj:Object):Number{
>> > >> return bounceObjects.push(obj);
>> > >> }
>> > >>
>> > >> Then you could create your hit tracker.
>> > >>
>> > >> function checkCollisions(){
>> > >> var len:Number = bounceObjects.length;
>> > >> // Loop through and check all objects hitting the ball
>> > >> for(var i:Number = 0; i < len; i++){
>> > >> // Check each object hit ball
>> > >> if(this.hitTest(bounceObjects[i])){
>> > >>
>> > >> this.bounce(); // Bounce the ball
>> > >> bounceObject[i].onHitByBall();
>> > >> }
>> > >> }
>> > >> }
>> > >>
>> > >> Have your onEnterFrame functions run checkCollisions every time.
>> > That
>> > >> way you check for hits against the paddle, bricks etc.
>> > >>
>> > >>
>> > >> The bounceObject[i].onHitByBall() would execute a function in
that
>> > >> objects code that would say what to do when it was hit by a
ball.
>> In
>> > the
>> > >> instance of a paddele do nothing, a brick - destory it!
>> > >>
>> > >>
>> > >> -Dan
>> > >>
>> > >> -----Original Message-----
>> > >> From: [EMAIL PROTECTED]
>> > >> [mailto:[EMAIL PROTECTED] Behalf Of
Paul
>> > >> Steven
>> > >> Sent: Wednesday, December 13, 2006 8:26 AM
>> > >> To: 'Flashcoders mailing list'
>> > >> Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple
pong
>> > type
>> > >> game
>> > >>
>> > >>
>> > >> Thanks for the reply Dan
>> > >>
>> > >> Not quite sure how the Ball references the Paddle or
alternatively
>> > the
>> > >> CollisionController references the ball and paddle.
>> > >>
>> > >> My Game class creates the Ball and Paddle as follows:
>> > >>
>> > >> mcPaddle = new Paddle(mcReference, "paddle_mc", 50, 100, 289);
>> > >>
>> > >> var vBall_Object = new Ball(mcReference, "ball_mc", 100, 160,
240);
>> > >> arrBallObjects.push(vBall_Object);
>> > >>
>> > >> If I wanted to give the Ball a reference to the paddle, would I
do
>> > >> something
>> > >> like this? (see last parameter)
>> > >>
>> > >> var vBall_Object = new Ball(mcReference, "ball_mc", 100, 160,
240,
>> > >> mcPaddle);
>> > >>
>> > >> Thanks
>> > >>
>> > >> Paul
>> > >>
>> > >>
>> > >> -----Original Message-----
>> > >> From: [EMAIL PROTECTED]
>> > >> [mailto:[EMAIL PROTECTED] On Behalf Of
>> > Holth,
>> > >> Daniel C.
>> > >> Sent: 13 December 2006 14:14
>> > >> To: Flashcoders mailing list
>> > >> Subject: RE: [Flashcoders] AS2 OOP Class Structure for simple
pong
>> > type
>> > >> game
>> > >>
>> > >>
>> > >> I would make the ball responsible for checking if it collides
with
>> > the
>> > >> paddle because the ball's behavior/state will change - not the
>> > paddle's,
>> > >> nor
>> > >> does the state of the 'game' really change.
>> > >>
>> > >> An alternative would be to create a CollissionControler.as that
does
>> > all
>> > >> your hit testing for you. This may become useful when you add
the
>> > bricks
>> > >> or
>> > >> other objects that need to check for collisions.
>> > >>
>> > >> -Dan
>> > >>
>> > >> -----Original Message-----
>> > >> From: [EMAIL PROTECTED]
>> > >> [mailto:[EMAIL PROTECTED] Behalf Of
Paul
>> > >> Steven
>> > >> Sent: Wednesday, December 13, 2006 8:02 AM
>> > >> To: 'Flashcoders mailing list'
>> > >> Subject: [Flashcoders] AS2 OOP Class Structure for simple pong
type
>> > game
>> > >>
>> > >>
>> > >> I am creating a simple pong / breakout / arkanoid game in AS2
and
>> not
>> > >> sure
>> > >> how best to deal with the classes.
>> > >>
>> > >> So far I have a Game.as class, a Paddle.as class and a Ball.as
>> class.
>> > >>
>> > >> I need to detect when the ball (or balls) collide with the
Paddle.
>> > >>
>> > >> My question is, which class should check for this collision?
>> > >>
>> > >> Should the Game class do this or should I pass a reference to
the
>> > Paddle
>> > >> into the Ball class so the Ball is able to check this collision
>> > itself?
>> > >>
>> > >> If it is the Game class, then I guess it is a case of giving
both
>> the
>> > >> Paddle
>> > >> and Ball classes a method to return their current position and
then
>> > >> letting
>> > >> the Game class compare these positions to determine if a
collision
>> > has
>> > >> occurred?
>> > >>
>> > >> If the Ball class needs to have a reference to the Paddle passed
to
>> > it, I
>> > >> am
>> > >> not sure how this is done. So I would appreciate any advice on
this.
>> > >>
>> > >> I appreciate there are probably a lot of different solutions to
>> this,
>> > but
>> > >> I
>> > >> am trying to get off on the right footing with this OOP
programming.
>> > >>
>> > >> Many thanks
>> > >>
>> > >> Paul
>> > >>
>> > >> _______________________________________________
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>>
>>
>> --
>>
>> : : ) Scott
>> _______________________________________________
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