// 

// Adapted from Processing textbook

// 

​

function setup() {

  createCanvas(400, 100);

  background(220);

  // Draws a wave across the screen (setup omitted, canvas is 700 x 70)

  noStroke();

​

  let angle = 0;

  for (let x = 0; x <= width; x += 5) {

    fill(0);

    let y = 50 + (sin(angle) * 35);

    rect(x, y, 2, 4);

    fill(255);

    y = 50 + (cos(angle) * 35);

    rect(x, y, 2, 4);

    angle += PI / 15;

  }

}