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25
let x = 320;
let y = 180;
let xspeed = 5;
let yspeed = 2;
let r = 25;
function setup() {
createCanvas(640, 360);
}
function draw() {
background(0);
ellipse(x, y, r*2, r*2);
x += xspeed;
y += yspeed;
if (x > width - r || x < r) {
xspeed = -xspeed;
}
if (y > height - r || y < r) {
yspeed = -yspeed;
}
}