let sky;

​

function preload() {

  sky = loadImage("sky.jpg");

}

​

function setup() {

  createCanvas(400, 400);

  background(255);

  tint(255, 120);

  image(sky, 0, 0);

}

​

function draw() {

  if (mouseIsPressed) {

    strokeWeight(0.1);

    fill(255,100);

    ellipse(mouseX, mouseY, bubbleSize);

    bubbleSize = abs(mouseX - pmouseX);

  }

​

  if (keyIsPressed && key == "c") {

    background(255);

​

    tint(255, 120);

    image(sky, 0, 0);

  }

}

​