​

function preload(){

    img_mask = loadImage('cat.png')

}

​

function setup() {

    createCanvas(400, 400)

​

    img = createGraphics(400, 400)

    img.fill(255,204,0)

    img.ellipse(200, 200, 300, 300)

    imgClone = img.get()

    imgClone.mask(img_mask)

​

}

​

function draw() {

    background(100)

    imgClone.mask(img_mask)

    image(imgClone,0,0)

}