doodle.io - OpenProcessing

mySketch
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let backgroundColor;
var socket = io.connect($OP.getEchoServerURL(422520));
function setup() {
  backgroundColor = 255;
  //size(500, 500);
  createCanvas(windowWidth, windowHeight);
  background(backgroundColor);
  strokeWeight(10);
  name = prompt("Name");
  socket.on('ping', drawline);
}
​
function draw() {
  if (mouseIsPressed == true) {
    let params = [mouseX, mouseY, pmouseX, pmouseY];
    socket.emit('ping', {name: name, params:params});
    line(...params);
  }
​
}
function drawLine() {
  
}
function keyPressed() {
  if (key == 'r') {
    stroke(255, 0, 0);
  }
  
  if (key == 'b') {
    stroke(0,0,255);
  }
  
  if (key == 'g') {
    stroke(0,255,0);
  }
  
  if (key == 'w') {
    stroke(255);
  }
  
  if (key == 'q') {
    stroke(0);
  }
  
  if (key == 'z') {
    stroke(random(-255, 255), random(-255, 255), random(-255, 255));
  }
  
  if (key == ' ') {
    background(backgroundColor);
  }
}