const serial = new p5.WebSerial();

// HTML button object:

let portButton;

let inData;                   // for incoming serial data

let outByte = 0;              // for outgoing data

let x = 1;

let circle1;

function setup() {

  createCanvas(600, 600);          // make the canvas

  // check to see if serial is available:

  if (!navigator.serial) {

    alert("WebSerial is not supported in this browser. Try Chrome or MS Edge.");

  }

  // if serial is available, add connect/disconnect listeners:

  navigator.serial.addEventListener("connect", portConnect);

  navigator.serial.addEventListener("disconnect", portDisconnect);

  // check for any ports that are available:

  serial.getPorts();

  // if there's no port chosen, choose one:

  serial.on("noport", makePortButton);

  // open whatever port is available:

  serial.on("portavailable", openPort);

  // handle serial errors:

  serial.on("requesterror", portError);

  // handle any incoming serial data:

  serial.on("data", serialEvent);

  serial.on("close", makePortButton);

  circle1 = new Circle(0, 300, 100);

}

​

class Circle {

  constructor(x, y, d) {

    this.x = x;

    this.y = y;

    this.d = d;

  }

  move() {

    if (this.x<=50) {x = 1;}

    else if (this.x>=550) {x =-1;}

    let y;

    if (inData==undefined) {

      y=0;

    } else {

      y = inData;

    }

    this.x+=(y/20)*x;

  }

  display () {

    fill(255, 255, 0);

    ellipse(this.x, this.y, this.d);

    fill(0);

    textSize(70);

    text(":)", this.x-20, this.y-40, this.d);

  }

}

function draw() {

   background(0);

   fill(255);

  textSize(20);

   text("smiley ball speed: " + inData, width/2-120, 100);

  text("by pauline, fuad, phoebe :)", width/2-120, 130);

​

  circle1.display();

  circle1.move();

​

}

​

// if there's no port selected, 

// make a port select button appear:

function makePortButton() {

  // create and position a port chooser button:

  portButton = createButton("choose port");

  portButton.position(10, 10);

  // give the port button a mousepressed handler:

  portButton.mousePressed(choosePort);

}

// make the port selector window appear:

function choosePort() {

  if (portButton) portButton.show();

  serial.requestPort();

}

// open the selected port, and make the port 

// button invisible:

function openPort() {

  // wait for the serial.open promise to return,

  // then call the initiateSerial function

  serial.open().then(initiateSerial);

  // once the port opens, let the user know:

  function initiateSerial() {

    console.log("port open");

  }

  // hide the port button once a port is chosen:

  if (portButton) portButton.hide();

}

// pop up an alert if there's a port error:

function portError(err) {

  alert("Serial port error: " + err);

}

// read any incoming data as a string

// (assumes a newline at the end of it):

function serialEvent() {

  inData = Number(serial.read());

  console.log(inData);

}

// try to connect if a new serial port 

// gets added (i.e. plugged in via USB):

function portConnect() {

  console.log("port connected");

  serial.getPorts();

}

// if a port is disconnected:

function portDisconnect() {

  serial.close();

  console.log("port disconnected");

}

function closePort() {

  serial.close();

}