​

// Create variable for your button

let b;

​

function setup() {

  createCanvas(400, 400);

  gui = createGui();

  img = loadImage('background.jpg');

  // Create Button 1

  b = createButton("Fact-Check", 100, 50, 200, 50);

  // You can assign callback functions for onPress, onHold, onRelease, and onChange

  b.onPress = function() {

    print(b.label + " pressed.");

  }

  b.onHold = function() {

    // Draw an ellipse when Button 1 is held.

    image(img, 0, height / 2, img.width / 2, img.height / 2);

  }

  b.onRelease = function() {

    print(b.label + " released.");

  }

  // Callbacks can also be assigned to existing, user-defined functions.

  b.onChange = printHello;

}

​

function printHello() {

  print("Hello, I've changed!");

}

​

function draw() {

  background(220);

  drawGui();

}

​

/// Add these lines below sketch to prevent scrolling on mobile

function touchMoved() {

  // do some stuff

  return false;

}