Making Things Talk

COMMUNICATING IN (NEAR) REAL TIME 169

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// if the last player's on the bottom, add to the top:

else if (lastPlayerAdded.paddleV == nextBottomPaddleV) {

nextTopPaddleV = nextTopPaddleV + paddleHeight * 2;

v = nextTopPaddleV;

}

} else { // if there are no players, add to the top:

v = nextTopPaddleV;

}

// make a new Player object with the position you just calculated

// and using the Client that generated the serverEvent:

Player newPlayer = new Player(h, v, thisClient);

// add the new Player to the playerList:

playerList.add(newPlayer);

// Announce the new Player:

print("We have a new player: ");

println(newPlayer.client.ip());

newPlayer.client.write("hi\r\n");

}

void listenToClients() {

// get the next client that sends a message:

Client speakingClient = myServer.available();

Player speakingPlayer = null;

// iterate over the playerList to figure out whose

// client sent the message:

for (int p = 0; p < playerList.size(); p++) {

// get the next object in the ArrayList, convert it to a Player:

Player thisPlayer = (Player)playerList.get(p);

// compare the client of thisPlayer to the client that sent a message;

// if they're the same, then this is the Player we want:

if (thisPlayer.client == speakingClient) {

speakingPlayer = thisPlayer;

}

}

// read what the client sent:

if (speakingPlayer !