​

// Create variable for your Button

let b;

​

function setup() {

  createCanvas(400, 400);

  gui = createGui();

  // Create Button

  b = createButton("Button", 100, 50, 200, 50);

}

​

function draw() {

  background(220);

  drawGui();

  if (b.isPressed) {

    // Print a message when Button is pressed.

    print(b.label + " pressed.");

  }

  if (b.isHeld) {

    // Draw an ellipse when Button is held.

    fill(255, 0, 0);

    ellipse(200, 300, 100);

  }

}

​

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

function touchMoved() {

  // do some stuff

  return false;

}