/** Start the Client */
public void start() {
DEBUG.set(true);
DEBUG.trace("Pong Client");
DEBUG.set(false);
C_PongModel model = new C_PongModel();
C_PongView view = new C_PongView();
C_PongController cont = new C_PongController(model, view);
makeContactWithServer(model, cont);
model.addObserver(view); // Add observer to the model
view.setVisible(true); // Display Screen
}
/**
* Called from the model when its state is changed
*
* <p>Create two arrays of serializable that contain the updates to be sent to each player. The
* only difference between the two arrays are the timestamps to calculate the RTT. It is necessary
* to have two array because the states are sent asynchronously, therefore if we just change the
* relevant index, both players would get the seconds players timestamp.
*
* @param aPongModel Model of game
* @param arg Arguments - not used
*/
public synchronized void update(Observable aPongModel, Object arg) {
DEBUG.trace("Updating clients");
S_PongModel model = (S_PongModel) aPongModel;
ball = model.getBall();
bats = model.getBats();
// The state the send to the left player
Serializable[] state =
new Serializable[] {
bats[0],
bats[1],
ball,
model.getLastPingTimestamp(Global.LEFT_PLAYER)
+ Global.DELIMITER
+ model.getLastPingTimestamp(Global.RIGHT_PLAYER)
};
if (model.isDelayCompensation() && !model.isMulticast()) {
// Get both players average ping
// e.g. leftAvgPing = 200
// rightAvgPing = 200
long leftAvgPing = model.getAveragePing(Global.LEFT_PLAYER),
rightAvgPing = model.getAveragePing(Global.RIGHT_PLAYER);
// Calculate how much we need to delay each player.
// One players delay will always be negative
// so their update will be sent immediately
// e.g. leftDelay = 200 - 200 = 0
// rightDelay = 200 - 200 = 0
long leftDelay = (rightAvgPing - leftAvgPing), rightDelay = (leftAvgPing - rightAvgPing);
// Calculate the actual delay (including the last delay)
// e.g. Assuming the left player was delayed by 50ms last tick
// delay = (0 + 50) = 50 = 50ms delay
// delay = (0 + 0) = 0 = 0ms delay
// Anything created than or equal to 0 will treated as 0.
long leftActualDelay = leftDelay + model.getLastUpdateDelay(Global.LEFT_PLAYER),
rightActualDelay = rightDelay + model.getLastUpdateDelay(Global.RIGHT_PLAYER);
// Send the update to both players with their corresponding delay
left.put(state, leftActualDelay);
right.put(state, rightActualDelay);
// Store how much we've delayed each player so we
// can offset it against their delay on the next tick
model.setLastUpdateDelay(Global.LEFT_PLAYER, leftDelay);
model.setLastUpdateDelay(Global.RIGHT_PLAYER, rightDelay);
} else {
// Even if this is a multicast game, the broadcast is sent twice,
// this is because one player may have connected over TCP,
// This should really be fixed so TCP players are not joined to
// Multicast games.
// TODO: Refactor the NetObjectWriter so we can do something like
// TODO: clients.update(state) and it will determine the rest
left.put(state);
right.put(state);
}
}
