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var x = 200;
var y = 200;
function setup() {
createCanvas(400, 400);
frameRate(5);
}
function draw() {
background(0,0,0,10);
ellipse(x,y,20,20);
var dir = int(random(4));
if(dir === 0){
x = x + 20;
}
else if(dir === 1){
x = x - 20;
}
else if(dir === 2){
y = y + 20;
}
else if(dir === 3){
y = y - 20;
}
}