/*https://editor.p5js.org/p5/sketches/Structure:_Loop
 * @name Loop
 * @description The code inside the draw() function runs continuously from top
 * to bottom until the program is stopped.
 */
let y = 100;

// The statements in the setup() function
// execute once when the program begins
function setup() {
  createCanvas(720, 400); // Size must be the first statement
  stroke(255); // Set line drawing color to white
  frameRate(30);
}
// The statements in draw() are executed until the
// program is stopped. Each statement is executed in
// sequence and after the last line is read, the first
// line is executed again.
function draw() {
  background(0); // Set the background to black
  y = y - 1;
  if (y < 0) {
    y = height;
  }
  line(0, y, width, y);
}