Genuary - Generative music

let balls = [];  // array to store the ball objects

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let notes = [261.63, 293.66, 329.63, 349.23, 392, 440, 493.88, 523.25]; // frequencies of the 8 notes

var palette = ["#fab515", "#d7312e", "#2a71af", "#ad7347", "#ad7347", "#1d1d1b"];

let envelope, oscillator;

let interval = 100; // interval at which to play each note, in milliseconds

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function setup() {

  size = min(windowWidth, windowHeight);

  createCanvas(size, size);

  noStroke();

  // tone

  envelope = new p5.Env();

  envelope.setADSR(0.01, 0.1, 0.1, 0.1);

  oscillator = new p5.Oscillator();

  oscillator.amp(envelope);

  oscillator.start();

  interval = random(100,600);

​

  // create 5 ball objects and add them to the array

  for (let i = 0; i < 10; i++) {

    chosenCol = int(random(0, palette.length));

    let ball = {

      x: random(width),  // random initial x position

      y: random(height), // random initial y position

      vx: random(-5, 5),  // random x velocity

      vy: random(-5, 5),  // random y velocity

      size: random(size/10, size/5),  // random size

      color: color(palette[chosenCol])  // random color

    };

    balls.push(ball);

  }

}

​

function draw() {

  background("#f9f0de");

​

  // update and draw each ball

  for (let i = 0; i < balls.length; i++) {

    let ball = balls[i];

​

    // update ball position

    ball.x += ball.vx;

    ball.y += ball.vy;

​

    // bounce the ball off the walls

    if (ball.x > width || ball.x < 0) {

      playNote();

      chosenCol = int(random(0, palette.length));

      ball.color = palette[chosenCol];

      ball.vx *= -1;

    }

    if (ball.y > height || ball.y < 0) {

      playNote();

      chosenCol = int(random(0, palette.length));

      ball.color = palette[chosenCol];

      ball.vy *= -1;

    }

​

    // bounce the ball off other balls

    for (let j = 0; j < balls.length; j++) {

      if (i !== j) {  // don't bounce the ball off itself

        let other = balls[j];

        let d = dist(ball.x, ball.y, other.x, other.y);

        if (d < ball.size / 2 + other.size / 2) {

          // balls are colliding, so bounce them off each other

          ball.vx *= -1;

          ball.vy *= -1;

          other.vx *= -1;

          other.vy *= -1;

        }

      }

    }

​

    // draw the ball

    fill(ball.color);

    ellipse(ball.x, ball.y, ball.size, ball.size);

  }

}

​

function playNote() {

  let randomIndex = floor(random(notes.length)); // select a random note

  oscillator.freq(notes[randomIndex]);

  envelope.play();  

}

​

​