hello_watch

This example is like hello_party, but uses partyWatchShared() to react to data updates.

This example shows how to connect to a party server, load a shared data object, and read and write to it. It also shows how to share a p5 color.

click to move the dot

Try this example in two browser windows at once!

index.js

let shared;
function preload() {
  partyConnect("wss://demoserver.p5party.org", "hello_watch");
  shared = partyLoadShared("shared", { x: 0, y: 0 });
}

function setup() {
  createCanvas(400, 400);
  noStroke();

  // stop looping; we'll redraw only when data changes
  noLoop();

  // subscribe to data changes, and draw when they happen
  partyWatchShared(shared, onDataChange, true);
}

function mousePressed(e) {
  // write shared dataa
  shared.x = mouseX;
  shared.y = mouseY;
}

function draw() {
  background("#ffcccc");
  fill("#000066");
  // read shared data
  ellipse(shared.x, shared.y, 100, 100);
}

function onDataChange(newValue) {
  console.log("onDataChange", newValue);
  // draw when the circle moves
  draw();
}

index.html

<!DOCTYPE html>
<html>
  <head> </head>
  <body>
    <main></main>

    <div id="readme"></div>

    <h2>index.js</h2>
    <div id="source-javascript"></div>

    <h2>index.html</h2>
    <div id="source-html"></div>

    <script src="https://cdn.jsdelivr.net/npm/p5@1.4.1/lib/p5.js"></script>
    <script src="/dist/p5.party.js"></script>
    <script src="index.js"></script>

    <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.0.3/highlight.min.js"></script>
    <link rel="stylesheet" href="/examples.css" />
    <script src="/examples.js" type="module"></script>
  </body>
</html>