This is the link, in case it does not work on a phone. Just drag the mouse or fingers over the canvas area.
CreateGraphics2
The code:
var extraCanvas;
var x;
var y;
var old;
var recta;
function setup() {
old = createCanvas(400, 400);
extraCanvas = createGraphics(400, 400)
extraCanvas.clear()
background(220);
}
function draw() {
//background(220);
image(extraCanvas, 0, 0)
x = random(200, 205)
y = random(200, 205)
fill(255, 0, 0)
//noStroke()
stroke(225)
rectMode(CENTER)
recta = rect(x, y, 50, 50)
if(mouseIsPressed){
extraCanvas.fill(0, 0, 255)
extraCanvas.noStroke()
extraCanvas.rect(mouseX, mouseY, 50, 50)
}
//image(extraCanvas, 0, 0)
}