SOURCE

let x=60;
let y=60;
let d=50;
let speed=5;
let speedy=10;
function setup(){
    createCanvas(500,150);
}
function draw(){
    background(120,20); 
    x+=speed;
    y+=speedy;
    if((x>500)||(x<30)){
        speed=-speed;
    }
    if((y>150)||(y<30)){
        speedy=-speedy;
}
ellipse(x,y,d,d);
    
}