Particles together

///S&&O SS2020 // course: *From Space to Space* with Hannah Pearl - Wilson
//press the mouse to create a particle system
// l or r to change wind direction

import mqtt.*; // import MQTT library
MQTTClient client; // declare class MQTTClient

ArrayList<ParticleSystem> sparksystems; //declare ArrayList of Particle Systems

String mePlayer = "/particles-together/pink/p2/xy";
String otherPlayer = "/particles-together/pink/p1/xy";

int otherMouseX = 0;  //for incoming values from other player's mouse xy
int otherMouseY = 0;

void setup() {
  client = new MQTTClient(this);
  client.connect("mqtt://tomasAxolotl:spielundobjekt@broker.shiftr.io", "tomas");  // "connect to namespace with clientID"
  size(1200, 900);
 
  sparksystems = new ArrayList<ParticleSystem>();  //initialize the Particle System class
}

// RECEIVE // .suscribe <3

void clientConnected() {
  println("client connected");
  client.subscribe(otherPlayer);
}

//transforms the incoming xy string from the other player into x, y coordinates on my canvas
// which are the new coordinates for the particle system origin point 

void messageReceived(String topic, byte[] payload) {
  // the incoming MQTT "message" is a String: "xValue,yValue"
  // to unpack it we use the "split" function:
  String incomingPayload = new String(payload);  
  String[] xy = split(incomingPayload, ',');
  println("new message: " + topic + " x: " + xy[0] + " y: " +xy[1]);
  otherMouseX = int(xy[0]);
  otherMouseY = int(xy[1]);
  sparksystems.add(new ParticleSystem(new PVector(otherMouseX, otherMouseY)));
}

//create my particle system at an emmiting point  
// .publish to send mouse x and y to coplayer!

void mousePressed(){ 
sparksystems.add(new ParticleSystem(new PVector(mouseX, mouseY)));
 client.publish(mePlayer, mouseX + "," + mouseY); // ("topic", "message") 
}

void draw(){
background(0);
// enhanced for loop which can go through arrays which change length
for (ParticleSystem ps : sparksystems){
ps.run();
}
}

void connectionLost() {
  println("connection lost");
}