Hi,
I’d like to send UDP messages containing X/Y coordinates (something like this: “45:231″) of a controller app (Processing PApplet running in a JFrame) via the network and have jMonkeyEngine process the coordinates as fired shots (rays).
What would be the best way to implement this?
I have tried several approaches bt was not able to get it working.
Option 1:
- create a SpiderMonkey server, connect the game to the server (already have a working example)
- send UDP Packets to the SpiderMonkey server and have the messages releayed to the game using JME messaging API?
The problem I have:
I can not extend SimpleApp in my controller app that sends the coordinates, as this will be a Swing app based on Processing and disturb or block the graphics update threads and raise exceptions in Processing.
If you have Processing, you can try this code:
int xmpos = -1;
int ympos = -1;
DatagramSocket dsocket;
int port = 9001;
InetAddress IPAddress;
void setup () {
size (512, 384);
frameRate (25);
// setup networking
try {
IPAddress = InetAddress.getByName("localhost");
dsocket = new DatagramSocket();
} catch (SocketException e) {
e.printStackTrace();
} catch (UnknownHostException u) {
u.printStackTrace();
}
}
void draw () {
if (mousePressed) {
// to filter if mouse did not move
if (xmpos != mouseX || ympos != mouseY) {
xmpos = mouseX;
ympos = mouseY;
println("CLICK:t" + xmpos + "t" + ympos);
sendShot(xmpos*2, ympos*2);
fill(255,0,0);
ellipse(xmpos, ympos, 9, 9);
}
}
}
// this sends the created shot coordinates via UDP
// maybe better to send serialzed objects?
void sendShot(int x, int y) {
String message = x + ":" + y + "n";
println(message);
byte[] packet = message.getBytes();
println("Sending datagram with " + packet.length + " bytes");
try {
dsocket.send(new DatagramPacket(packet, packet.length, IPAddress, port));
}
catch (Exception e) {
e.printStackTrace();
}
}
Option 2:
Send my Coordinates directly to the game, that runs a simple UDP listener Thread. I got this working, however after the first message received, it looks like it’s no longer receiving other messages. Threading problems?
Looks like this:
public void simpleInitApp() {
ulisten = new UDPListener();
Thread ShotInput = new Thread(ulisten);
ShotInput.start();
}
private class UDPListener implements Runnable {
int clientPort = 9001;
int buffer_size = 1024;
byte buffer[] = new byte[buffer_size];
DatagramPacket p;
DatagramSocket ds;
public UDPListener() {
try {
ds = new DatagramSocket(clientPort);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println("Starting UDPListener");
}
public void run() {
try {
p = new DatagramPacket(buffer, buffer.length);
ds.receive(p);
System.out.println(new String(p.getData(), 0, p.getLength()));
} catch (Exception e) {
e.printStackTrace();
}
}
}
Option 3:
Trying to integrate the SpiderMonkeyserver directly into the controller app as a seperate thread and send SM messages to the game? Only blocked the drawing of the graphic updates in my Processing app.
I have already done a lot of tests, but could not make it work.
Hmm, it lookes that I just don’t understand some concepts yet and need some help og more experienced programmers.
I really would appreciate your help or some hints on this and maybe some comments on which would be the best approach.
Many thanks!
Marc
