let rectHeight = 100;

let patternValue = 100000;

let yLoc;

​

function setup() {

  createCanvas(640, 640);

​

  yLoc = height * 0.5;

​

  // for loop example

  for (let i = 0; i < 10; i++) {

    print(i);

  }

​

  // while loop example

  let num = 40;

  while (num < 50) {

    print(num);

    num++;

  }

​

  rectMode(CENTER);

}

​

function draw() {

  // choose a new number to enter into randomSeed every 60 frames

  if (frameCount % 60 == 0) {

    patternValue = random(1000000);

  }

​

  // choose a new pattern of random numbers by changing the seed value

  randomSeed(patternValue);

​

  // random colors

  background(random(0, 255), random(0, 255), random(0, 255));

​

  // loop through and draw rectangles on screen

  // offset the start of the draw by half the width of the rect

  // since we're drawing with rectmode center

  for (let i = rectWidth / 2; i < width; i += rectWidth) {

    rect(i, yLoc + random(-20, 20), rectWidth, rectHeight);

  }

}

​

// choose a new seed when the mouse is pressed

function mousePressed() {

  patternValue = random(1000000);

}

​

// choose specific randomseed values based on key press

function keyPressed() {

  if (key == "a") {

    patternValue = 1000;

  }

  if (key == "b") {

    patternValue = 10000;

  }

}

​