let gravity;

let position;

let acceleration;

let wind;

let drag = 0.99;

let mass = 50;

let rVal = 0;

let alpha = 255;

let left = 0; // True (1) if mouse is being clicked on left side of screen

let right = 0; // True (1) if mouse is being clicked on right side of screen

let serialSetup = false;

​

function setup() {

  createCanvas(640, 360);

  noFill();

  position = createVector(width / 2, 0);

  velocity = createVector(0, 0);

  acceleration = createVector(0, 0);

  gravity = createVector(0, 0.5 * mass);

  wind = createVector(0, 0);

​

  // Set up serial connection

  setUpSerial();

​

  textSize(20);

}

​

function draw() {

  background(255);

​

  if (serialSetup) {

    let windtext = "";

    if (alpha < 300) {

      wind.x = -1;

      windtext = "Wind : Right";

    } else if (alpha > 800) {

      wind.x = 1;

      windtext = "Wind : Left";

    } else {

      wind.x = 0;

      windtext = "No wind.";

    }

​

    push();

    fill(0);

    text(windtext, 20, 50);

    pop();

​

    applyForce(wind);

    applyForce(gravity);

    velocity.add(acceleration);

    velocity.mult(drag);

    position.add(velocity);

    acceleration.mult(0);

    ellipse(position.x, position.y, mass, mass);

    if (position.y > height - mass / 2) {

      velocity.y *= -0.9; // A little dampening when hitting the bottom

      position.y = height - mass / 2;

      console.log(

        "Bounce! Position Y: " + position.y + ", Velocity Y: " + velocity.y

      );

      left = 1;

    } else {

      left = 0;

    }

  }

}

​

function applyForce(force) {

  // Newton's 2nd law: F = M * A

  // or A = F / M

  let f = p5.Vector.div(force, mass);

  acceleration.add(f);

}

​

function keyPressed() {

  if (keyCode == LEFT_ARROW) {

    wind.x = -1;

  }

  if (keyCode == RIGHT_ARROW) {

    wind.x = 1;

  }

  if (key == " ") {

    mass = random(15, 80);

    position.y = -mass;

    velocity.mult(0);

  }

}

​

// This function will be called by the web-serial library

// with each new *line* of data. The serial library reads

// the data until the newline and then gives it to us through

// this callback function

function readSerial(data) {

  if (data != null) {

    let fromArduino = split(trim(data), ",");

    if (fromArduino.length == 2) {

      rVal = int(fromArduino[0]);

      alpha = int(fromArduino[1]);

    }

​

    let sendToArduino = left + "," + right + "\n";

    writeSerial(sendToArduino);

  }

}

​

// Function to set up the serial connection

function setUpSerial() {

  // Use serial.js or any other appropriate method to set up serial connection

  // Example: serial = new p5.SerialPort();

}

​

// Function to write data to Arduino

function writeSerial(data) {

  // Use serial.js or any other appropriate method to write data to Arduino

}

​