let img;

let ditherType = 'atkinson';

​

function preload() {

  // img = loadImage('no_threat.jpg');

  img = loadImage('qr.png');

}

​

function setup() {

  pixelDensity(1);

  createCanvas(img.width, img.height);

​

  black = new Riso('black');

}

​

function draw() {

  background(255);

​

  let threshold = map(mouseX, 0, width, 0, 255);

​

  clearRiso();

​

  let dithered = ditherImage(img, ditherType, threshold);

  black.image(dithered, 0, 0);

​

  drawRiso();

}

​

function mouseClicked() {

  exportRiso();

}

​

function keyReleased() {

  if (key == 1) ditherType = 'atkinson';

  else if (key == 2) ditherType = 'floydsteinberg';

  else if (key == 3) ditherType = 'bayer';

  else if (key == 4) ditherType = 'none';

}

​