Countdown Generator

/**

 * Countdown Generator (v1.0.2)

 * GoToLoop (2020-Jun-23)

 *

 * https://Discourse.Processing.org/t/displaying-from-an-array/21251/7

 *

 * https://OpenProcessing.org/sketch/400949

 * https://Trinket.io/processing/0d6647fcd7

 */

​

'use strict';

​

const COUNTDOWN = 20;

var gen = countdown(COUNTDOWN); // generator which counts from 20 to 0

​

function setup() {

  createCanvas(100, 100).mousePressed(resetCountdown); // click to restart

  frameRate(1); // 1 FPS draw() callback

  fill('yellow').stroke(0).strokeWeight(2);

  textAlign(CENTER, CENTER).textSize(50);

}

​

function draw() {

  const { done, value } = gen.next(); // get next countdown value

  done && noLoop(); // pause sketch when countdown is done

  background(done && 'red' || 'blue'); // red bg when countdown is done

  text(value, width >> 1, height >> 1); // display countdown centralized

  print(done, value); // log generator's properties done & value

}

​

function resetCountdown() {

  gen = countdown(COUNTDOWN); // restart w/ a new countdown generator

  loop(); // resume sketch

}

​

function* countdown(count) { // generator function*

  count = abs(~~count); // make sure count is a positive integer

  while (count)  yield count--; // yield current count & decrease it by 1

  return count; // return 0 & finish this generator

}

​