/*https://editor.p5js.org/p5/sketches/Structure:_Redraw
 * @name Redraw
 * @description The redraw() function makes draw() execute once. In this example,
 * draw() is executed once every time the mouse is clicked.
 */

let y;

// The statements in the setup() function
// execute once when the program begins
function setup() {
  createCanvas(720, 400);
  stroke(255);
  noLoop();
  y = height * 0.5;
}

// 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);
  y = y - 4;
  if (y < 0) {
    y = height;
  }
  line(0, y, width, y);
}

function mousePressed() {
  redraw();
}