xxxxxxxxxx
function setup() {
createCanvas(400, 400);
rectMode(RADIUS)
}
function draw() {
background(100);
strokeWeight(0);
if(mouseX>175 && mouseX<225 &&mouseY<225 &&mouseY>175) {fill(0,0,0)} else {fill(255,255,255)}
square(width/2,height/2,50)
}