Making a multiplayer pong-style game?

[Whitehk]

Hi. I am 13 years-old and new to iphone development. I created my first app successfully and now I'm adding "the bells and whistles". I am trying to make a multiplayer option. Oh and by the way, the app is a pong-like game.(where you hit the ball back and forth and try to get it past your opponent) I need a way to compare where the user's touch is on the screen in relation to his half of the screen. So lets say on the bottom half we have player one and on the top half we have player 2. Player 1 is able to move there paddle without effecting player 2's paddle, and player 2 is able to move their paddle without effecting player 1's paddle. So basically there would be two people touching the screen at once and at a certain point, such as the center line dividing the two sides (think tennis as in the net dividing the two sides), you're not able to move the paddle that is on your half of the screen anymore. I have no idea how i'm gonna go about doing this. Any ideas? A great example of what I'm trying to accomplish would be the 2 player option on the glow hockey app on the app store. Sorry it's worded weirdly. I did the best I could to explain it. Thanks for helping. I appreciate it!

[smasher]

When a player (either player) touches the screen or moves their finger, you'll get the x and y positions of the touch. Assuming the screen is 480 pixels high, you know that a touch between 0 and 240 is in the top half, and a touch between 240 and 480 is in the lower half. You should be able to do something like this:

if (touchPosition.y < 240)
   // move player1puck to touchPosition.x
else
  // move player2puck to touchPosition.x

[Whitehk]

Originally Posted by smasher

When a player (either player) touches the screen or moves their finger, you'll get the x and y positions of the touch. Assuming the screen is 480 pixels high, you know that a touch between 0 and 240 is in the top half, and a touch between 240 and 480 is in the lower half. You should be able to do something like this:

if (touchPosition.y < 240)
   // move player1puck to touchPosition.x
else
  // move player2puck to touchPosition.x

The only problem with this is that both user's touches interfere with one another. I want to make it to where it does what you said, but Player 1 and Player 2 are able to move their paddles separately and at the same time. If I did it like you said, Player 1 would have to start the game, hit the ball, then release his finger in order for player 2 to be able to move their paddle. I do appreciate the reply though. It was definitely on the right track. Now, I just need to figure out how to make two separate touches on each half of the court. Anyone got any ideas?

[smasher]

Player 1 does not have to release their finger - you'll get the touches for player 2 just fine, assuming you've enabled multi-touch and you're looping through all of the touches in the event. Check this thread.

http://www.iphonedevsdk.com/forum/ip...html#post89851

I bet you're only checking the first touch, no matter how many touches there are.

[romeorx2]

Originally Posted by Whitehk

The only problem with this is that both user's touches interfere with one another. I want to make it to where it does what you said, but Player 1 and Player 2 are able to move their paddles separately and at the same time. If I did it like you said, Player 1 would have to start the game, hit the ball, then release his finger in order for player 2 to be able to move their paddle. I do appreciate the reply though. It was definitely on the right track. Now, I just need to figure out how to make two separate touches on each half of the court. Anyone got any ideas?

Maybe You Can try this:


CGPoint touchPoint = [touch locationInView:self.view];
CGPoint location = [touch locationInView:touch.view];
//if (CGRectContainsPoint([paddle frame], touchPoint)) {
if (location.y >= 241){
[UIView beginAnimations:@"Move Paddle" context:nil];
CGPoint xtouchPoint = CGPointMake(touchPoint.x,paddle.center.y);
paddle.center = xtouchPoint;
[UIView commitAnimations];
}

//if (CGRectContainsPoint([paddle2 frame], touchPoint)) {
if (location.y <= 240){
[UIView beginAnimations:@"Move Paddle" context:nil];
CGPoint xtouchPoint = CGPointMake(touchPoint.x,paddle2.center.y);
paddle2.center = xtouchPoint;
[UIView commitAnimations];
}

}


}

thats the code i used,

I Have a game similar to what you are trying to do in the App Store it's called "Star Tennis"

Hope this helps